/* roulang page: index */
:root {
            --brand: #3B82F6;
            --brand-dark: #1D4ED8;
            --brand-deep: #0F3B78;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --ink: #0F172A;
            --sub: #475569;
            --faint: #64748B;
            --line: #E2E8F0;
            --success: #16A34A;
            --warn: #D97706;
            --danger: #DC2626;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
            --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--brand);
            text-decoration: none;
            transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
        }

        a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-decoration-color: currentColor;
            text-underline-offset: 3px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }

        button:active:not(:disabled) {
            transform: scale(0.98);
        }

        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        @media (min-width: 1280px) {
            .container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }

        /* Header & Nav */
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }

        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 19px;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .logo-link:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .logo-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--brand);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            padding: 4px 0;
            position: relative;
            white-space: nowrap;
            text-decoration: none;
        }

        .nav-links a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .nav-links a.active {
            color: var(--brand);
            font-weight: 700;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .hamburger {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            color: var(--ink);
            font-size: 20px;
        }

        .hamburger:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: var(--brand-50);
        }

        /* Announcement bar */
        .announcement-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--line);
            padding: 8px 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
        }

        .announcement-bar::-webkit-scrollbar {
            height: 3px;
        }

        .announcement-bar::-webkit-scrollbar-thumb {
            background: #CBD5E1;
            border-radius: 999px;
        }

        .announcement-inner {
            display: flex;
            align-items: center;
            gap: 12px;
            min-width: max-content;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: #fff;
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 999px;
            font-size: 12.5px;
            color: var(--sub);
            white-space: nowrap;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
            transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
        }

        .chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: var(--brand-50);
            text-decoration: none;
        }

        .chip-date {
            color: var(--faint);
            font-size: 11.5px;
            letter-spacing: 0.02em;
        }

        /* Mobile menu */
        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
            max-height: 0;
            overflow: hidden;
            transition: max-height 260ms ease;
        }

        .mobile-menu.open {
            max-height: 560px;
        }

        .mobile-menu-inner {
            padding: 16px 20px 24px;
        }

        .mobile-menu-links {
            display: flex;
            flex-direction: column;
            gap: 2px;
            list-style: none;
            margin: 0 0 16px;
            padding: 0;
        }

        .mobile-menu-links a {
            display: block;
            padding: 10px 8px;
            font-size: 15px;
            font-weight: 500;
            color: var(--sub);
            border-radius: 8px;
            text-decoration: none;
        }

        .mobile-menu-links a:hover {
            background: var(--brand-50);
            color: var(--brand);
            text-decoration: none;
        }

        .mobile-menu-links a.active {
            background: var(--brand-50);
            color: var(--brand);
            font-weight: 700;
        }

        .mobile-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* Section base */
        .section {
            padding: 72px 0;
        }

        .section-alt {
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }

        .section-tight {
            padding: 48px 0;
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            background: var(--brand-50);
            border: 1px solid rgba(59, 130, 246, 0.25);
            border-radius: 999px;
            padding: 4px 16px;
            letter-spacing: 0.04em;
            margin-bottom: 16px;
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 14px;
            letter-spacing: -0.01em;
        }

        .section-subtitle {
            font-size: 15.5px;
            color: var(--sub);
            line-height: 1.85;
            margin: 0 0 32px;
            max-width: 760px;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 30px;
            }
            .section {
                padding: 88px 0;
            }
            .section-tight {
                padding: 56px 0;
            }
        }

        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
            .hamburger {
                display: none;
            }
            .mobile-menu {
                display: none !important;
            }
            .section {
                padding: 96px 0;
            }
            .section-title {
                font-size: 32px;
            }
        }

        @media (max-width: 1023px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: inline-flex;
            }
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 78vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #EFF6FF 0%, #F8FAFC 48%, #E8F0FE 100%);
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            background-image: url('/assets/images/026daa6605922571.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
        }

        .hero-grid-pattern {
            position: absolute;
            inset: 0;
            z-index: 1;
            background-image:
                linear-gradient(rgba(59, 130, 246, 0.06) 1px, transparent 1px),
                linear-gradient(90deg, rgba(59, 130, 246, 0.06) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
            -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
        }

        .hero .container {
            position: relative;
            z-index: 2;
            padding-top: 48px;
            padding-bottom: 48px;
        }

        .hero-title {
            font-size: 30px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin: 0 0 18px;
        }

        .hero-question {
            font-size: 17px;
            font-weight: 600;
            color: var(--brand-dark);
            margin: 0 0 16px;
            line-height: 1.6;
        }

        .hero-desc {
            font-size: 15.5px;
            color: var(--sub);
            line-height: 1.9;
            margin: 0 0 28px;
            max-width: 660px;
        }

        .hero-form-wrap {
            max-width: 560px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-soft);
            padding: 24px;
        }

        .hero-form-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 16px;
        }

        .hero-form-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 12px;
        }

        @media (min-width: 768px) {
            .hero-title {
                font-size: 36px;
            }
            .hero-form-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-form-grid .full-span {
                grid-column: span 2;
            }
        }

        @media (max-width: 767px) {
            .hero {
                min-height: auto;
                padding: 40px 0;
            }
            .hero-title {
                font-size: 24px;
            }
            .hero-form-wrap {
                padding: 18px;
            }
        }

        /* Form elements */
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--sub);
            margin-bottom: 6px;
        }

        .form-input,
        .form-select,
        .form-textarea {
            width: 100%;
            height: 42px;
            padding: 0 14px;
            border: 1px solid var(--line);
            border-radius: 8px;
            font-size: 14px;
            color: var(--ink);
            background: #fff;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
            font-family: inherit;
        }

        .form-textarea {
            height: auto;
            padding: 10px 14px;
            resize: vertical;
            min-height: 80px;
        }

        .form-input:focus,
        .form-select:focus,
        .form-textarea:focus {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
            outline: none;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            font-size: 14.5px;
            font-weight: 600;
            border: 1px solid transparent;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
            white-space: nowrap;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn:hover {
            text-decoration: none;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            color: #fff;
            box-shadow: var(--shadow-lift);
        }

        .btn-secondary {
            background: #fff;
            color: var(--brand);
            border-color: var(--brand);
        }

        .btn-secondary:hover {
            background: var(--brand-50);
            color: var(--brand-dark);
            border-color: var(--brand-dark);
        }

        .btn-outline {
            background: transparent;
            color: var(--sub);
            border-color: var(--line);
        }

        .btn-outline:hover {
            background: #F1F5F9;
            color: var(--ink);
            border-color: #CBD5E1;
        }

        .btn-sm {
            padding: 7px 16px;
            font-size: 13px;
        }

        .btn-lg {
            padding: 13px 32px;
            font-size: 16px;
        }

        .btn-block {
            width: 100%;
            display: flex;
        }

        /* Cards */
        .card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
        }

        .card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.35);
        }

        .card-hover-lift:hover {
            transform: translateY(-3px);
        }

        /* Metric cards */
        .metric-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            text-align: center;
            transition: box-shadow var(--transition-base), border-color var(--transition-base);
        }

        .metric-card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.3);
        }

        .metric-number {
            font-family: "Inter", "DIN Alternate", "Roboto", system-ui, sans-serif;
            font-size: 40px;
            font-weight: 700;
            color: var(--brand);
            line-height: 1.1;
            letter-spacing: -0.02em;
        }

        .metric-unit {
            font-size: 14px;
            color: var(--faint);
            font-weight: 500;
        }

        .metric-label {
            font-size: 13px;
            color: var(--sub);
            margin-top: 8px;
        }

        /* Service cards */
        .service-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px;
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .service-card:hover {
            box-shadow: var(--shadow-lift);
            border-color: var(--brand);
            transform: translateY(-4px);
        }

        .service-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: var(--brand-50);
            border-radius: 10px;
            font-size: 20px;
            margin-bottom: 14px;
        }

        .service-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
        }

        .service-card p {
            font-size: 13.5px;
            color: var(--sub);
            line-height: 1.75;
            margin: 0 0 16px;
        }

        .service-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13.5px;
            font-weight: 600;
            color: var(--brand);
            text-decoration: none;
        }

        .service-link:hover {
            color: var(--brand-dark);
            text-decoration: none;
        }

        /* Comparison cards */
        .compare-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px;
            transition: box-shadow var(--transition-base), border-color var(--transition-base);
        }

        .compare-card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.3);
        }

        .compare-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 8px 0;
            font-size: 14px;
            color: var(--sub);
            line-height: 1.7;
        }

        /* Milestone */
        .milestone-node {
            position: relative;
            padding-left: 28px;
            padding-bottom: 28px;
            border-left: 2px solid #DBEAFE;
        }

        .milestone-node:last-child {
            padding-bottom: 0;
        }

        .milestone-dot {
            position: absolute;
            left: -8px;
            top: 2px;
            width: 14px;
            height: 14px;
            background: var(--brand);
            border: 3px solid #fff;
            border-radius: 50%;
            box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
        }

        .milestone-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .milestone-desc {
            font-size: 13px;
            color: var(--sub);
            line-height: 1.7;
            margin: 0;
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--line);
            border-radius: 10px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color var(--transition-base);
        }

        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.3);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 20px;
            background: #fff;
            border: none;
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            text-align: left;
            border-radius: 0;
        }

        .faq-question:hover {
            color: var(--brand);
            background: var(--brand-50);
            text-decoration: none;
        }

        .faq-answer {
            padding: 0 20px 18px;
            font-size: 14px;
            color: var(--sub);
            line-height: 1.8;
            border-top: 1px solid #F1F5F9;
            padding-top: 14px;
        }

        /* News list */
        .news-item {
            display: flex;
            gap: 16px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            box-shadow: var(--shadow-card);
            padding: 16px;
            transition: box-shadow var(--transition-base), border-color var(--transition-base);
        }

        .news-item:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.3);
        }

        .news-thumb {
            width: 80px;
            height: 80px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
            background: #F1F5F9;
        }

        @media (min-width: 768px) {
            .news-thumb {
                width: 120px;
                height: 80px;
            }
        }

        .news-content h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 6px;
            line-height: 1.5;
        }

        .news-content p {
            font-size: 13px;
            color: var(--sub);
            line-height: 1.65;
            margin: 0 0 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 12px;
            color: var(--faint);
        }

        /* Tags */
        .tag {
            display: inline-block;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 500;
            background: #F1F5F9;
            color: var(--sub);
            border-radius: 6px;
            white-space: nowrap;
        }

        /* Data grid */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        @media (min-width: 768px) {
            .data-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
        }

        @media (min-width: 1024px) {
            .data-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 24px;
            }
        }

        .service-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }

        @media (min-width: 768px) {
            .service-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (min-width: 1024px) {
            .service-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 24px;
            }
        }

        @media (min-width: 1280px) {
            .service-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .compare-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }

        @media (min-width: 768px) {
            .compare-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
        }

        .news-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 14px;
        }

        @media (min-width: 768px) {
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
        }

        @media (min-width: 1024px) {
            .news-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .milestone-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 0;
        }

        @media (min-width: 768px) {
            .milestone-grid {
                grid-template-columns: repeat(5, 1fr);
                gap: 0;
            }
            .milestone-node {
                padding-left: 20px;
                padding-bottom: 0;
                border-left: none;
                border-top: 2px solid #DBEAFE;
                padding-top: 20px;
            }
            .milestone-dot {
                left: 0;
                top: -8px;
            }
        }

        /* Footer */
        .site-footer {
            background: #0B1220;
            color: #CBD5E1;
            padding: 56px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
            margin-bottom: 40px;
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 1.4fr 1fr 1fr 1fr;
                gap: 28px;
            }
        }

        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-brand-desc {
            font-size: 13.5px;
            color: #94A3B8;
            line-height: 1.85;
            margin: 0 0 16px;
        }

        .footer-title {
            font-size: 14px;
            font-weight: 600;
            color: #E2E8F0;
            margin: 0 0 14px;
        }

        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 13.5px;
            color: #94A3B8;
            text-decoration: none;
            transition: color var(--transition-base);
        }

        .footer-links a:hover {
            color: #60A5FA;
            text-decoration: none;
        }

        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 20px;
            font-size: 12.5px;
            color: #64748B;
            text-align: center;
        }

        /* Trust badges */
        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--sub);
            font-weight: 500;
            padding: 10px 18px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 999px;
            box-shadow: var(--shadow-card);
            white-space: nowrap;
        }

        /* Scroll bar styling */
        .scroll-x {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: #CBD5E1 transparent;
        }

        .scroll-x::-webkit-scrollbar {
            height: 4px;
        }

        .scroll-x::-webkit-scrollbar-thumb {
            background: #CBD5E1;
            border-radius: 999px;
        }

        /* Progress bar alt */
        .step-dot-row {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .step-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #DBEAFE;
        }

        .step-dot.active {
            background: var(--brand);
            width: 24px;
            border-radius: 999px;
        }

        @media (max-width: 767px) {
            .hide-mobile {
                display: none !important;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section-title {
                font-size: 23px;
            }
            .metric-number {
                font-size: 32px;
            }
        }

/* roulang page: category1 */
:root {
            --brand: #3B82F6;
            --brand-dark: #1D4ED8;
            --brand-deep: #0F3B78;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --ink: #0F172A;
            --sub: #475569;
            --faint: #64748B;
            --line: #E2E8F0;
            --success: #16A34A;
            --warn: #D97706;
            --danger: #DC2626;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
            --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--brand);
            text-decoration: none;
            transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
        }

        a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-decoration-color: currentColor;
            text-underline-offset: 3px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }

        button:active:not(:disabled) {
            transform: scale(0.98);
        }

        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (min-width: 640px) {
            .container {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }

        /* Header & Nav */
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }

        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 19px;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .logo-link:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .logo-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--brand);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            padding: 4px 0;
            position: relative;
            white-space: nowrap;
            text-decoration: none;
        }

        .nav-links a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .nav-links a.active {
            color: var(--brand);
            font-weight: 700;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .hamburger {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            color: var(--ink);
            font-size: 20px;
        }

        .hamburger:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
        }

        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
            .hamburger {
                display: none;
            }
        }

        .chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: #fff;
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 999px;
            font-size: 12.5px;
            color: var(--sub);
            white-space: nowrap;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
            transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
        }

        .chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
            text-decoration: none;
        }

        .chip-date {
            color: var(--faint);
            font-size: 11.5px;
            letter-spacing: 0.02em;
        }

        .announcement-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--line);
            padding: 6px 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .announcement-inner {
            display: flex;
            gap: 10px;
            align-items: center;
            min-width: max-content;
        }

        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 16px 0;
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu-inner {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .mobile-menu-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .mobile-menu-links a {
            display: block;
            padding: 10px 0;
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            border-bottom: 1px solid var(--line);
            text-decoration: none;
        }

        .mobile-menu-links a:hover,
        .mobile-menu-links a.active {
            color: var(--brand);
            text-decoration: none;
        }

        .mobile-menu-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 8px;
        }

        @media (min-width: 1024px) {
            .mobile-menu {
                display: none !important;
            }
        }

        /* Breadcrumb */
        .breadcrumb {
            padding: 18px 0 0;
            font-size: 13px;
            color: var(--faint);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--faint);
            text-decoration: none;
        }

        .breadcrumb a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .breadcrumb .sep {
            color: var(--line);
            user-select: none;
        }

        .breadcrumb .current {
            color: var(--sub);
            font-weight: 500;
        }

        /* Page hero (category) */
        .cat-hero {
            padding: 48px 0 24px;
            background: linear-gradient(180deg, #FFFFFF 0%, var(--bg) 100%);
            border-bottom: 1px solid var(--line);
        }

        .cat-hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
            align-items: center;
        }

        @media (min-width: 768px) {
            .cat-hero-grid {
                grid-template-columns: 1.2fr 0.8fr;
                gap: 40px;
            }
        }

        .cat-hero h1 {
            font-size: 30px;
            line-height: 1.25;
            font-weight: 700;
            margin: 0 0 16px;
            color: var(--ink);
            letter-spacing: 0.01em;
        }

        .cat-hero .lead {
            font-size: 15px;
            color: var(--sub);
            line-height: 1.85;
            margin: 0 0 20px;
            max-width: 640px;
        }

        .cat-hero .hero-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .stat-mini {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            padding: 16px;
            box-shadow: var(--shadow-card);
        }

        .stat-mini .num {
            font-size: 24px;
            font-weight: 700;
            color: var(--brand);
            line-height: 1.2;
        }

        .stat-mini .lbl {
            font-size: 12px;
            color: var(--faint);
            margin-top: 4px;
        }

        /* Filter bar */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            align-items: center;
            padding: 20px 0 8px;
        }

        .filter-bar .filter-label {
            font-size: 13px;
            color: var(--faint);
            margin-right: 4px;
            font-weight: 500;
        }

        .filter-tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 13px;
            background: #fff;
            border: 1px solid var(--line);
            color: var(--sub);
            white-space: nowrap;
            cursor: pointer;
            transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
        }

        .filter-tag:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
        }

        .filter-tag.active {
            background: var(--brand);
            border-color: var(--brand);
            color: #fff;
            font-weight: 600;
        }

        /* Tool cards grid */
        .tools-section {
            padding: 32px 0 48px;
        }

        .tools-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            margin-top: 20px;
        }

        @media (min-width: 640px) {
            .tools-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (min-width: 1024px) {
            .tools-grid {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 24px;
            }
        }

        .tool-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .tool-card:hover {
            box-shadow: var(--shadow-lift);
            transform: translateY(-2px);
            border-color: rgba(59, 130, 246, 0.4);
        }

        .tool-card .tool-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: #EFF6FF;
            color: var(--brand);
            border-radius: 10px;
            font-size: 20px;
            font-weight: 700;
        }

        .tool-card h2 {
            font-size: 18px;
            font-weight: 700;
            margin: 0;
            color: var(--ink);
            line-height: 1.35;
        }

        .tool-card .tool-desc {
            font-size: 14px;
            color: var(--sub);
            line-height: 1.8;
            margin: 0;
            flex-grow: 1;
        }

        .tool-card .tool-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 12px;
            color: var(--faint);
            border-top: 1px solid var(--line);
            padding-top: 12px;
        }

        .tool-card .tool-tag {
            display: inline-flex;
            align-items: center;
            padding: 2px 10px;
            background: #F1F5F9;
            border-radius: 999px;
            font-size: 11.5px;
            color: var(--sub);
            font-weight: 500;
        }

        .tool-card .tool-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--brand);
            white-space: nowrap;
            text-decoration: none;
        }

        .tool-card .tool-link:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        /* Rules & explanation section */
        .rules-section {
            padding: 48px 0;
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }

        .section-heading {
            margin-bottom: 24px;
        }

        .section-heading h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--ink);
            line-height: 1.3;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .section-heading h2::before {
            content: '';
            display: inline-block;
            width: 4px;
            height: 22px;
            background: var(--brand);
            border-radius: 4px;
            flex-shrink: 0;
        }

        .section-heading p {
            font-size: 14px;
            color: var(--faint);
            margin: 0;
            line-height: 1.8;
        }

        .rules-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        @media (min-width: 768px) {
            .rules-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        .rule-card {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            padding: 20px;
            transition: box-shadow var(--transition-base);
        }

        .rule-card:hover {
            box-shadow: var(--shadow-lift);
        }

        .rule-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--ink);
        }

        .rule-card p {
            font-size: 13.5px;
            color: var(--sub);
            margin: 0;
            line-height: 1.8;
        }

        /* Image banner */
        .image-banner {
            padding: 48px 0;
            background: var(--bg);
        }

        .image-banner-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
            align-items: center;
        }

        @media (min-width: 768px) {
            .image-banner-grid {
                grid-template-columns: 0.9fr 1.1fr;
            }
        }

        .image-banner img {
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
        }

        .image-banner .banner-text h2 {
            font-size: 22px;
            font-weight: 700;
            margin: 0 0 12px;
            color: var(--ink);
        }

        .image-banner .banner-text p {
            font-size: 14px;
            color: var(--sub);
            margin: 0 0 12px;
            line-height: 1.8;
        }

        /* Related tools */
        .related-section {
            padding: 48px 0;
            background: #fff;
            border-top: 1px solid var(--line);
        }

        .related-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 20px;
        }

        @media (min-width: 768px) {
            .related-grid {
                grid-template-columns: 1fr 1fr 1fr;
            }
        }

        .related-card {
            display: flex;
            align-items: center;
            gap: 12px;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            padding: 16px;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
        }

        .related-card:hover {
            border-color: rgba(59, 130, 246, 0.4);
            box-shadow: var(--shadow-lift);
        }

        .related-card .rel-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 8px;
            color: var(--brand);
            font-size: 16px;
            flex-shrink: 0;
        }

        .related-card .rel-text {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            line-height: 1.35;
        }

        .related-card a {
            text-decoration: none;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 12px;
            width: 100%;
        }

        .related-card a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        /* Data note */
        .data-note {
            padding: 32px 0 48px;
            background: var(--bg);
        }

        .data-note-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .data-note-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin: 0;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .data-note-card p {
            font-size: 13.5px;
            color: var(--sub);
            margin: 0;
            line-height: 1.8;
        }

        .data-note-card .note-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .note-tag {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            background: #F1F5F9;
            border-radius: 999px;
            font-size: 12px;
            color: var(--sub);
            font-weight: 500;
        }

        /* CTA section */
        .cat-cta {
            padding: 48px 0;
            background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
            border-top: 1px solid var(--line);
        }

        .cat-cta-card {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--line);
            max-width: 640px;
            margin: 0 auto;
        }

        .cat-cta-card h2 {
            font-size: 22px;
            font-weight: 700;
            margin: 0 0 8px;
            color: var(--ink);
        }

        .cat-cta-card p {
            font-size: 14px;
            color: var(--sub);
            margin: 0 0 20px;
            line-height: 1.8;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            background: var(--brand);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            border: none;
            border-radius: var(--radius-btn);
            text-decoration: none;
            transition: background var(--transition-base), transform 120ms ease, box-shadow var(--transition-base);
            cursor: pointer;
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            text-decoration: none;
            color: #fff;
            box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            background: #fff;
            color: var(--brand);
            font-size: 15px;
            font-weight: 600;
            border: 1px solid var(--brand);
            border-radius: var(--radius-btn);
            text-decoration: none;
            transition: background var(--transition-base), color var(--transition-base), transform 120ms ease;
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: #EFF6FF;
            text-decoration: none;
            color: var(--brand-dark);
        }

        /* Footer */
        .site-footer {
            background: #0B1220;
            color: #CBD5E1;
            padding: 48px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1.3fr 1fr 1fr 1fr;
                gap: 24px;
            }
        }

        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: #F1F5F9;
            margin: 0 0 8px;
        }

        .footer-brand-desc {
            font-size: 13px;
            color: #94A3B8;
            line-height: 1.8;
            margin: 0;
        }

        .footer-title {
            font-size: 14px;
            font-weight: 600;
            color: #E2E8F0;
            margin: 0 0 12px;
            letter-spacing: 0.02em;
        }

        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 13px;
            color: #94A3B8;
            text-decoration: none;
            transition: color var(--transition-base);
        }

        .footer-links a:hover {
            color: #DBEAFE;
            text-decoration: none;
        }

        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, 0.15);
            padding-top: 16px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 12px;
            color: #64748B;
            margin: 0;
        }

        /* Utility */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: category2 */
:root {
   --brand: #3B82F6;
   --brand-dark: #1D4ED8;
   --brand-deep: #0F3B78;
   --brand-50: #F0F6FF;
   --bg: #F8FAFC;
   --card: #FFFFFF;
   --ink: #0F172A;
   --sub: #475569;
   --faint: #64748B;
   --line: #E2E8F0;
   --success: #16A34A;
   --warn: #D97706;
   --danger: #DC2626;
   --radius-card: 14px;
   --radius-btn: 10px;
   --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
   --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
   --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 html {
   scroll-behavior: smooth;
   -webkit-text-size-adjust: 100%;
 }
 body {
   font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
   background-color: var(--bg);
   color: var(--ink);
   line-height: 1.75;
   margin: 0;
   min-height: 100vh;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
 img {
   max-width: 100%;
   height: auto;
   display: block;
 }
 a {
   color: var(--brand);
   text-decoration: none;
   transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
 }
 a:hover {
   color: var(--brand-dark);
   text-decoration: underline;
   text-decoration-color: currentColor;
   text-underline-offset: 3px;
 }
 a:focus-visible,
 button:focus-visible,
 input:focus-visible,
 select:focus-visible,
 textarea:focus-visible {
   outline: 2px solid var(--brand);
   outline-offset: 2px;
   border-radius: 4px;
 }
 button {
   cursor: pointer;
   font-family: inherit;
   transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
 }
 button:active:not(:disabled) {
   transform: scale(0.98);
 }
 button:disabled {
   opacity: 0.5;
   cursor: not-allowed;
 }
 .container {
   width: 100%;
   max-width: 1200px;
   margin-left: auto;
   margin-right: auto;
   padding-left: 32px;
   padding-right: 32px;
 }
 /* Header & Nav */
 .site-header {
   background-color: #fff;
   border-bottom: 1px solid var(--line);
   position: sticky;
   top: 0;
   z-index: 100;
   box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
 }
 .nav-bar {
   display: flex;
   align-items: center;
   justify-content: space-between;
   height: 68px;
   gap: 24px;
 }
 .logo-link {
   display: flex;
   align-items: center;
   gap: 10px;
   font-weight: 700;
   font-size: 19px;
   color: var(--ink);
   white-space: nowrap;
   letter-spacing: 0.01em;
 }
 .logo-link:hover {
   color: var(--brand);
   text-decoration: none;
 }
 .logo-badge {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   width: 36px;
   height: 36px;
   background: var(--brand);
   color: #fff;
   border-radius: 8px;
   font-size: 16px;
   font-weight: 700;
 }
 .nav-links {
   display: none;
   align-items: center;
   gap: 28px;
   list-style: none;
   margin: 0;
   padding: 0;
 }
 .nav-links a {
   font-size: 15px;
   color: var(--sub);
   font-weight: 500;
   padding: 4px 0;
   position: relative;
   white-space: nowrap;
   text-decoration: none;
 }
 .nav-links a:hover {
   color: var(--brand);
   text-decoration: none;
 }
 .nav-links a.active {
   color: var(--brand);
   font-weight: 700;
 }
 .nav-links a.active::after {
   content: '';
   position: absolute;
   left: 0;
   right: 0;
   bottom: -6px;
   height: 2px;
   background: var(--brand);
   border-radius: 2px;
 }
 .nav-right {
   display: flex;
   align-items: center;
   gap: 12px;
 }
 .hamburger {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   width: 40px;
   height: 40px;
   border: 1px solid var(--line);
   border-radius: 8px;
   background: #fff;
   color: var(--ink);
   font-size: 20px;
 }
 .hamburger:hover {
   border-color: var(--brand);
   color: var(--brand);
   background: var(--brand-50);
 }
 .chip {
   display: inline-flex;
   align-items: center;
   gap: 6px;
   padding: 4px 14px;
   background: #fff;
   border: 1px solid rgba(59, 130, 246, 0.2);
   border-radius: 999px;
   font-size: 12.5px;
   color: var(--sub);
   white-space: nowrap;
   box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
   transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
 }
 .chip:hover {
   border-color: var(--brand);
   color: var(--brand);
   background: var(--brand-50);
   text-decoration: none;
 }
 .chip-date {
   color: var(--faint);
   font-size: 11.5px;
   letter-spacing: 0.02em;
 }
 .announcement-bar {
   background: #F1F5FB;
   border-bottom: 1px solid var(--line);
   overflow-x: auto;
   scrollbar-width: none;
   -ms-overflow-style: none;
 }
 .announcement-bar::-webkit-scrollbar {
   display: none;
 }
 .announcement-inner {
   display: flex;
   gap: 10px;
   align-items: center;
   height: 42px;
   white-space: nowrap;
   padding: 0 20px;
   width: max-content;
 }
 .announcement-bar .container {
   padding: 0;
   max-width: 1200px;
   min-width: auto;
 }
 .mobile-menu {
   display: none;
   background: #fff;
   border-bottom: 1px solid var(--line);
   position: absolute;
   top: 68px;
   left: 0;
   right: 0;
   z-index: 99;
   box-shadow: 0 12px 20px rgba(15, 23, 42, 0.05);
 }
 .mobile-menu.open {
   display: block;
 }
 .mobile-menu-inner {
   padding: 20px 32px;
 }
 .mobile-menu-links {
   list-style: none;
   margin: 0;
   padding: 0;
   display: flex;
   flex-direction: column;
   gap: 12px;
 }
 .mobile-menu-links a {
   font-size: 16px;
   color: var(--sub);
   font-weight: 500;
   text-decoration: none;
   padding: 6px 0;
   display: block;
 }
 .mobile-menu-links a.active {
   color: var(--brand);
   font-weight: 700;
 }
 .mobile-menu-links a:hover {
   color: var(--brand);
 }
 /* Breadcrumb */
 .breadcrumb {
   font-size: 13px;
   color: var(--faint);
   margin: 16px 0 0;
   display: flex;
   align-items: center;
   gap: 8px;
   flex-wrap: wrap;
 }
 .breadcrumb a {
   color: var(--faint);
   text-decoration: none;
   font-weight: 500;
 }
 .breadcrumb a:hover {
   color: var(--brand);
   text-decoration: underline;
 }
 .breadcrumb span {
   color: var(--brand);
   font-weight: 600;
 }
 .breadcrumb-sep {
   color: #CBD5E1;
 }
 /* Hero variant for分类页 */
 .page-hero {
   padding: 56px 0 32px;
   background: #fff;
   border-bottom: 1px solid var(--line);
 }
 .page-hero .container {
   display: grid;
   grid-template-columns: 1fr;
   gap: 28px;
   align-items: center;
 }
 .page-hero-overline {
   color: var(--brand);
   font-weight: 700;
   font-size: 13px;
   letter-spacing: 0.08em;
   text-transform: uppercase;
 }
 .page-hero h1 {
   font-size: 30px;
   line-height: 1.3;
   margin: 8px 0 16px;
   font-weight: 800;
 }
 .page-hero-desc {
   font-size: 16px;
   color: var(--sub);
   max-width: 720px;
   margin: 0 0 20px;
 }
 .page-hero-tags {
   display: flex;
   gap: 10px;
   flex-wrap: wrap;
 }
 .btn {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   gap: 8px;
   padding: 10px 22px;
   border-radius: var(--radius-btn);
   font-weight: 600;
   font-size: 14px;
   border: 1px solid transparent;
   transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
   text-decoration: none;
   white-space: nowrap;
 }
 .btn-primary {
   background: var(--brand);
   color: #fff;
 }
 .btn-primary:hover {
   background: var(--brand-dark);
   color: #fff;
   text-decoration: none;
   box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
 }
 .btn-outline {
   background: #fff;
   color: var(--brand);
   border-color: var(--brand);
 }
 .btn-outline:hover {
   background: var(--brand-50);
   color: var(--brand-dark);
   text-decoration: none;
   border-color: var(--brand-dark);
 }
 .btn-ghost {
   background: #F1F5F9;
   color: var(--ink);
   border-color: transparent;
 }
 .btn-ghost:hover {
   background: #E2E8F0;
   color: var(--brand-dark);
   text-decoration: none;
 }
 /* Section */
 .section {
   padding: 64px 0;
 }
 .section-alt {
   background: #fff;
 }
 .section-tight {
   padding: 48px 0;
 }
 .section-header {
   margin-bottom: 32px;
 }
 .section-title {
   font-size: 24px;
   line-height: 1.3;
   font-weight: 800;
   margin: 0 0 8px;
   color: var(--ink);
 }
 .section-subtitle {
   font-size: 15px;
   color: var(--sub);
   max-width: 760px;
   margin: 0;
 }
 .section-head-row {
   display: flex;
   justify-content: space-between;
   align-items: flex-end;
   gap: 20px;
   flex-wrap: wrap;
 }
 .section-link {
   font-size: 14px;
   font-weight: 600;
   white-space: nowrap;
 }
 /* Cards */
 .card {
   background: var(--card);
   border: 1px solid var(--line);
   border-radius: var(--radius-card);
   box-shadow: var(--shadow-card);
   transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
   overflow: hidden;
 }
 .card:hover {
   box-shadow: var(--shadow-lift);
   border-color: rgba(59, 130, 246, 0.35);
   transform: translateY(-2px);
 }
 .card-body {
   padding: 24px;
 }
 .card-title {
   font-size: 17px;
   font-weight: 700;
   margin: 0 0 8px;
   color: var(--ink);
   line-height: 1.4;
 }
 .card-text {
   font-size: 14px;
   color: var(--sub);
   margin: 0 0 12px;
   line-height: 1.7;
 }
 .card-meta {
   display: flex;
   align-items: center;
   flex-wrap: wrap;
   gap: 8px;
   font-size: 12px;
   color: var(--faint);
 }
 .badge {
   display: inline-flex;
   align-items: center;
   gap: 4px;
   padding: 4px 10px;
   background: #F1F5F9;
   color: var(--sub);
   border-radius: 999px;
   font-size: 12px;
   font-weight: 500;
   line-height: 1.2;
   border: 1px solid transparent;
 }
 .badge-blue {
   background: var(--brand-50);
   color: var(--brand);
   border-color: rgba(59, 130, 246, 0.2);
 }
 .badge-green {
   background: #F0FDF4;
   color: var(--success);
   border-color: rgba(22, 163, 74, 0.2);
 }
 .badge-amber {
   background: #FFF7ED;
   color: var(--warn);
   border-color: rgba(217, 119, 6, 0.2);
 }
 .grid {
   display: grid;
   gap: 20px;
 }
 .grid-2 {
   grid-template-columns: repeat(2, 1fr);
 }
 .grid-3 {
   grid-template-columns: repeat(3, 1fr);
 }
 .grid-4 {
   grid-template-columns: repeat(4, 1fr);
 }
 .cover-img {
   width: 100%;
   aspect-ratio: 16/9;
   object-fit: cover;
   background: #E2E8F0;
 }
 .cover-img-sm {
   width: 100%;
   aspect-ratio: 4/3;
   object-fit: cover;
 }
 /* FAQ */
 .faq-item {
   background: #fff;
   border: 1px solid var(--line);
   border-radius: 12px;
   margin-bottom: 10px;
   overflow: hidden;
 }
 .faq-question {
   width: 100%;
   text-align: left;
   padding: 18px 20px;
   background: transparent;
   border: none;
   font-size: 15px;
   font-weight: 600;
   color: var(--ink);
   display: flex;
   align-items: flex-start;
   gap: 10px;
 }
 .faq-question:hover {
   background: #F8FAFC;
 }
 .faq-icon {
   flex-shrink: 0;
   width: 22px;
   height: 22px;
   background: var(--brand-50);
   color: var(--brand);
   border-radius: 50%;
   display: inline-flex;
   align-items: center;
   justify-content: center;
   font-size: 13px;
   font-weight: 800;
   margin-top: 2px;
 }
 .faq-answer {
   padding: 0 20px 18px 52px;
   font-size: 14px;
   color: var(--sub);
   line-height: 1.75;
   display: none;
 }
 .faq-item.open .faq-answer {
   display: block;
 }
 .faq-item.open {
   border-left: 3px solid var(--brand);
 }
 .faq-toggle {
   margin-left: auto;
   color: var(--faint);
   font-size: 18px;
   line-height: 1;
 }
 /* Form */
 .form-card {
   background: #fff;
   border-radius: var(--radius-card);
   border: 1px solid var(--line);
   padding: 28px;
   box-shadow: var(--shadow-card);
 }
 .form-grid {
   display: grid;
   grid-template-columns: repeat(2, 1fr);
   gap: 16px;
 }
 .form-field {
   display: flex;
   flex-direction: column;
   gap: 6px;
 }
 .form-field label {
   font-size: 13px;
   font-weight: 600;
   color: var(--sub);
 }
 .form-field input,
 .form-field select,
 .form-field textarea {
   border: 1px solid var(--line);
   border-radius: 8px;
   padding: 10px 12px;
   font-size: 14px;
   color: var(--ink);
   background: #fff;
   height: 42px;
   font-family: inherit;
 }
 .form-field textarea {
   height: 100px;
   resize: vertical;
 }
 .form-field input:focus,
 .form-field select:focus,
 .form-field textarea:focus {
   border-color: var(--brand);
   box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
   outline: none;
 }
 .form-full {
   grid-column: span 2;
 }
 .form-submit {
   display: flex;
   justify-content: flex-end;
   margin-top: 16px;
 }
 .form-note {
   font-size: 12px;
   color: var(--faint);
   margin-top: 8px;
 }
 /* Filter bar */
 .filter-bar {
   display: flex;
   align-items: center;
   gap: 10px;
   flex-wrap: wrap;
   padding: 12px 16px;
   background: #fff;
   border: 1px solid var(--line);
   border-radius: 10px;
   margin-bottom: 24px;
 }
 .filter-chip {
   padding: 6px 14px;
   border-radius: 999px;
   background: #F1F5F9;
   border: 1px solid transparent;
   font-size: 13px;
   font-weight: 500;
   color: var(--sub);
   cursor: pointer;
   transition: all var(--transition-base);
 }
 .filter-chip.active {
   background: var(--brand);
   color: #fff;
 }
 .filter-chip:hover {
   background: var(--brand-50);
   color: var(--brand);
 }
 .filter-chip.active:hover {
   background: var(--brand-dark);
   color: #fff;
 }
 /* Rounded data panel */
 .data-panel {
   background: #F1F5FB;
   border-radius: 12px;
   padding: 20px 24px;
   border: 1px solid rgba(59, 130, 246, 0.15);
 }
 .table-row {
   display: grid;
   grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
   gap: 10px;
   padding: 10px 0;
   border-bottom: 1px solid var(--line);
   font-size: 14px;
   align-items: center;
 }
 .table-row.header-row {
   font-weight: 700;
   color: var(--sub);
   border-bottom-width: 2px;
 }
 .table-row span:first-child {
   text-align: left;
 }
 .table-row span {
   text-align: center;
   color: var(--ink);
 }
 /* Footer */
 .site-footer {
   background: #0B1220;
   color: #CBD5E1;
   padding: 56px 0 24px;
   margin-top: 0;
 }
 .footer-grid {
   display: grid;
   grid-template-columns: repeat(4, 1fr);
   gap: 32px;
   margin-bottom: 32px;
 }
 .footer-brand {
   color: #fff;
   font-size: 18px;
   font-weight: 700;
   margin: 0 0 12px;
 }
 .footer-brand-desc {
   font-size: 13px;
   line-height: 1.7;
   color: #94A3B8;
   margin: 0;
 }
 .footer-links {
   list-style: none;
   margin: 0;
   padding: 0;
   display: flex;
   flex-direction: column;
   gap: 8px;
 }
 .footer-title {
   color: #fff;
   font-size: 15px;
   font-weight: 600;
   margin: 0 0 12px;
 }
 .footer-links a {
   color: #94A3B8;
   font-size: 13px;
   text-decoration: none;
   transition: color 180ms;
 }
 .footer-links a:hover {
   color: #fff;
   text-decoration: underline;
 }
 .footer-bottom {
   border-top: 1px solid rgba(255,255,255,0.1);
   padding-top: 20px;
   font-size: 12px;
   color: #64748B;
   text-align: center;
 }
 /* Responsive */
 @media (min-width: 1024px) {
   .nav-links { display: flex; }
   .hamburger { display: none; }
   .page-hero .container { grid-template-columns: 1.1fr 0.9fr; }
   .page-hero h1 { font-size: 36px; }
 }
 @media (min-width: 768px) and (max-width: 1023px) {
   .nav-links { display: none; }
   .hamburger { display: inline-flex; }
   .grid-4 { grid-template-columns: repeat(2, 1fr); }
   .grid-3 { grid-template-columns: repeat(2, 1fr); }
   .footer-grid { grid-template-columns: repeat(2, 1fr); }
   .form-grid { grid-template-columns: 1fr 1fr; }
 }
 @media (max-width: 767px) {
   .container { padding-left: 20px; padding-right: 20px; }
   .nav-bar { height: 60px; }
   .announcement-inner { padding: 0 20px; }
   .page-hero { padding: 36px 0 24px; }
   .page-hero h1 { font-size: 24px; }
   .section { padding: 40px 0; }
   .section-tight { padding: 32px 0; }
   .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
   .footer-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
   .form-grid { grid-template-columns: 1fr; }
   .form-full { grid-column: span 1; }
   .table-row { grid-template-columns: 2fr 1fr 1fr; font-size: 12px; }
   .table-row span:nth-child(5) { display: none; }
   .table-row span:nth-child(4) { display: none; }
   .section-head-row { flex-direction: column; align-items: flex-start; }
   .mobile-menu-inner { padding: 16px 20px; }
 }

/* roulang page: category4 */
:root {
            --brand: #3B82F6;
            --brand-dark: #1D4ED8;
            --brand-deep: #0F3B78;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --ink: #0F172A;
            --sub: #475569;
            --faint: #64748B;
            --line: #E2E8F0;
            --success: #16A34A;
            --warn: #D97706;
            --danger: #DC2626;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
            --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--brand);
            text-decoration: none;
            transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
        }
        a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-decoration-color: currentColor;
            text-underline-offset: 3px;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }
        button:active:not(:disabled) {
            transform: scale(0.98);
        }
        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        @media (min-width: 640px) {
            .container {
                padding-left: 32px;
                padding-right: 32px;
            }
        }
        @media (min-width: 1024px) {
            .container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }
        /* Header & Nav */
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 19px;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .logo-link:hover {
            color: var(--brand);
            text-decoration: none;
        }
        .logo-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--brand);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
        }
        .nav-links {
            display: none;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            padding: 4px 0;
            position: relative;
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links a:hover {
            color: var(--brand);
            text-decoration: none;
        }
        .nav-links a.active {
            color: var(--brand);
            font-weight: 700;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .hamburger {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            color: var(--ink);
            font-size: 20px;
        }
        .hamburger:hover {
            border-color: var(--brand);
            color: var(--brand);
        }
        .chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: #fff;
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 999px;
            font-size: 12.5px;
            color: var(--sub);
            white-space: nowrap;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
            transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
        }
        .chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: rgba(59, 130, 246, 0.04);
            text-decoration: none;
        }
        .chip-date {
            color: var(--faint);
            font-size: 11.5px;
            letter-spacing: 0.02em;
        }
        /* Announcement bar */
        .announcement-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--line);
        }
        .announcement-inner {
            display: flex;
            align-items: center;
            gap: 10px;
            overflow-x: auto;
            padding: 8px 0;
            scrollbar-width: thin;
            white-space: nowrap;
            -webkit-overflow-scrolling: touch;
        }
        .announcement-inner::-webkit-scrollbar {
            height: 4px;
        }
        .announcement-inner::-webkit-scrollbar-thumb {
            background: #CBD5E1;
            border-radius: 4px;
        }
        /* Mobile menu */
        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 16px 0;
            box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu-links a {
            display: block;
            padding: 10px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--sub);
            border-radius: 8px;
            text-decoration: none;
        }
        .mobile-menu-links a:hover,
        .mobile-menu-links a.active {
            background: rgba(59, 130, 246, 0.06);
            color: var(--brand);
            text-decoration: none;
        }
        .mobile-menu-links a.active {
            font-weight: 700;
        }
        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--faint);
            padding: 20px 0 8px;
        }
        .breadcrumb a {
            color: var(--sub);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--brand);
            text-decoration: underline;
        }
        .breadcrumb .sep {
            color: #94A3B8;
            user-select: none;
        }
        .breadcrumb .current {
            color: var(--brand);
            font-weight: 600;
        }
        /* Section base */
        .section {
            padding: 48px 0;
        }
        @media (min-width: 768px) {
            .section {
                padding: 64px 0;
            }
        }
        @media (min-width: 1024px) {
            .section {
                padding: 80px 0;
            }
        }
        .section-muted {
            background: #F1F5F9;
        }
        .section-white {
            background: #fff;
        }
        .section-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title::before {
            content: '';
            width: 4px;
            height: 24px;
            background: var(--brand);
            border-radius: 2px;
            flex-shrink: 0;
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 26px;
            }
        }
        .section-lead {
            font-size: 15px;
            color: var(--sub);
            line-height: 1.9;
            margin: 0 0 28px;
            max-width: 680px;
        }
        /* Cards */
        .card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
            overflow: hidden;
        }
        .card:hover {
            border-color: rgba(59, 130, 246, 0.45);
            box-shadow: var(--shadow-lift);
            transform: translateY(-2px);
        }
        .card-pad {
            padding: 22px;
        }
        @media (min-width: 768px) {
            .card-pad {
                padding: 26px;
            }
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .card-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.45;
            margin: 0 0 8px;
        }
        .card-text {
            font-size: 13.5px;
            color: var(--sub);
            line-height: 1.8;
            margin: 0 0 12px;
        }
        .badge-row {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 2px 10px;
            border-radius: 999px;
            font-size: 11.5px;
            font-weight: 500;
            background: #F1F5F9;
            color: var(--sub);
            white-space: nowrap;
        }
        .badge-blue {
            background: rgba(59, 130, 246, 0.08);
            color: var(--brand);
            border: 1px solid rgba(59, 130, 246, 0.2);
        }
        .badge-green {
            background: rgba(22, 163, 74, 0.08);
            color: var(--success);
            border: 1px solid rgba(22, 163, 74, 0.2);
        }
        .badge-amber {
            background: rgba(217, 119, 6, 0.08);
            color: var(--warn);
            border: 1px solid rgba(217, 119, 6, 0.2);
        }
        .badge-gray {
            background: #F1F5F9;
            color: var(--faint);
            border: 1px solid var(--line);
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            border: 1px solid transparent;
            text-decoration: none;
            white-space: nowrap;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }
        .btn:hover {
            text-decoration: none;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            color: #fff;
        }
        .btn-secondary {
            background: #fff;
            color: var(--brand);
            border-color: var(--brand);
        }
        .btn-secondary:hover {
            background: rgba(59, 130, 246, 0.06);
            color: var(--brand-dark);
        }
        .btn-ghost {
            background: transparent;
            color: var(--sub);
            border-color: var(--line);
        }
        .btn-ghost:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: rgba(59, 130, 246, 0.04);
        }
        /* Filter/Sort bar */
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 14px 18px;
            box-shadow: var(--shadow-card);
            margin-bottom: 24px;
        }
        .filter-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--faint);
            white-space: nowrap;
        }
        .filter-tags {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .filter-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            border-radius: 999px;
            font-size: 12.5px;
            font-weight: 500;
            color: var(--sub);
            background: #F1F5F9;
            border: 1px solid transparent;
            cursor: pointer;
            transition: all var(--transition-base);
        }
        .filter-tag:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: rgba(59, 130, 246, 0.04);
        }
        .filter-tag.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }
        /* Detail table */
        .field-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
        }
        @media (min-width: 768px) {
            .field-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
        }
        @media (min-width: 1024px) {
            .field-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }
        .field-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 10px;
            padding: 16px;
            text-align: left;
        }
        .field-name {
            font-size: 12px;
            font-weight: 600;
            color: var(--faint);
            margin-bottom: 4px;
        }
        .field-value {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
        }
        /* Footer */
        .site-footer {
            background: #0B1220;
            color: #E2E8F0;
            padding: 48px 0 24px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
            margin-bottom: 32px;
        }
        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr 1fr;
                gap: 36px;
            }
        }
        .footer-brand {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 10px;
        }
        .footer-brand-desc {
            font-size: 13px;
            color: #94A3B8;
            line-height: 1.8;
            margin: 0;
            max-width: 320px;
        }
        .footer-title {
            font-size: 14px;
            font-weight: 600;
            color: #E2E8F0;
            margin: 0 0 12px;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            font-size: 13px;
            color: #94A3B8;
            text-decoration: none;
        }
        .footer-links a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, 0.18);
            padding-top: 20px;
            text-align: center;
            font-size: 12.5px;
            color: #64748B;
        }
        /* Responsive nav */
        @media (min-width: 768px) {
            .nav-links {
                display: flex;
            }
            .hamburger {
                display: none;
            }
        }
        @media (max-width: 767px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: inline-flex;
            }
        }
        /* Extra for category page */
        .sample-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        @media (min-width: 640px) {
            .sample-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 22px;
            }
        }
        @media (min-width: 1024px) {
            .sample-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 24px;
            }
        }
        .download-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            padding: 22px;
            display: flex;
            align-items: center;
            gap: 16px;
            transition: var(--transition-base);
        }
        .download-card:hover {
            border-color: rgba(59, 130, 246, 0.45);
            box-shadow: var(--shadow-lift);
        }
        .download-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: rgba(59, 130, 246, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            flex-shrink: 0;
            color: var(--brand);
        }
        .download-info h3 {
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
        }
        .download-info p {
            font-size: 13px;
            color: var(--faint);
            margin: 0;
        }
        .data-note {
            background: #fff;
            border-left: 4px solid var(--brand);
            border-radius: 0 10px 10px 0;
            padding: 20px 22px;
            box-shadow: var(--shadow-card);
        }
        .data-note p {
            font-size: 14px;
            color: var(--sub);
            line-height: 1.9;
            margin: 0;
        }
        .related-tools {
            display: grid;
            grid-template-columns: 1fr;
            gap: 14px;
        }
        @media (min-width: 640px) {
            .related-tools {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (min-width: 1024px) {
            .related-tools {
                grid-template-columns: repeat(4, 1fr);
            }
        }
        .tool-mini {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 10px;
            padding: 16px;
            text-align: center;
            transition: var(--transition-base);
            text-decoration: none;
            display: block;
        }
        .tool-mini:hover {
            border-color: rgba(59, 130, 246, 0.45);
            box-shadow: var(--shadow-lift);
            text-decoration: none;
        }
        .tool-mini-icon {
            font-size: 24px;
            margin-bottom: 6px;
        }
        .tool-mini-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
        }
        .tool-mini:hover .tool-mini-name {
            color: var(--brand);
        }

/* roulang page: category3 */
:root {
            --brand: #3B82F6;
            --brand-dark: #1D4ED8;
            --brand-deep: #0F3B78;
            --brand-50: #EFF6FF;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --ink: #0F172A;
            --sub: #475569;
            --faint: #64748B;
            --line: #E2E8F0;
            --success: #16A34A;
            --warn: #D97706;
            --danger: #DC2626;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
            --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--brand);
            text-decoration: none;
            transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
        }

        a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-decoration-color: currentColor;
            text-underline-offset: 3px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }

        button:active:not(:disabled) {
            transform: scale(0.98);
        }

        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }

        /* Header & Nav */
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }

        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 19px;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .logo-link:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .logo-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--brand);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            padding: 4px 0;
            position: relative;
            white-space: nowrap;
            text-decoration: none;
        }

        .nav-links a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .nav-links a.active {
            color: var(--brand);
            font-weight: 700;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .hamburger {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            color: var(--ink);
            font-size: 20px;
        }

        .hamburger:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: var(--brand-50);
        }

        .chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: #fff;
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 999px;
            font-size: 12.5px;
            color: var(--sub);
            white-space: nowrap;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
            transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
        }

        .chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: var(--brand-50);
            text-decoration: none;
        }

        .chip-date {
            color: var(--faint);
            font-size: 11.5px;
            letter-spacing: 0.02em;
        }

        .announcement-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--line);
            padding: 6px 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .announcement-inner {
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
            padding: 2px 0;
        }

        /* Mobile menu */
        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu-inner {
            padding: 16px 20px 20px;
        }

        .mobile-menu-links {
            list-style: none;
            margin: 0 0 16px 0;
            padding: 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px 16px;
        }

        .mobile-menu-links a {
            font-size: 15px;
            color: var(--sub);
            padding: 8px 0;
            display: block;
            text-decoration: none;
        }

        .mobile-menu-links a.active {
            color: var(--brand);
            font-weight: 700;
        }

        .mobile-menu-chips {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
            .hamburger {
                display: none;
            }
            .mobile-menu {
                display: none !important;
            }
        }

        @media (max-width: 1023px) {
            .nav-links {
                display: none;
            }
        }

        /* Breadcrumb */
        .breadcrumb {
            font-size: 13px;
            color: var(--faint);
            padding: 16px 0 8px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
        }

        .breadcrumb a {
            color: var(--faint);
            text-decoration: none;
        }

        .breadcrumb a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .breadcrumb-sep {
            color: #CBD5E1;
            font-size: 12px;
        }

        .breadcrumb-current {
            color: var(--sub);
            font-weight: 500;
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            padding: 10px 24px;
            border: none;
            border-radius: var(--radius-btn);
            text-decoration: none;
            transition: background-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            color: #fff;
            text-decoration: none;
            box-shadow: var(--shadow-lift);
        }

        .btn-primary:active {
            transform: scale(0.98);
            background: var(--brand-deep);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: #fff;
            color: var(--brand);
            font-weight: 600;
            font-size: 15px;
            padding: 10px 24px;
            border: 1px solid var(--brand);
            border-radius: var(--radius-btn);
            text-decoration: none;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
            white-space: nowrap;
        }

        .btn-secondary:hover {
            background: var(--brand-50);
            color: var(--brand-dark);
            text-decoration: none;
            border-color: var(--brand-dark);
        }

        .btn-sm {
            padding: 6px 16px;
            font-size: 13px;
        }

        /* Sections */
        .section {
            padding: 56px 0;
        }

        @media (max-width: 767px) {
            .section {
                padding: 36px 0;
            }
        }

        .section-alt {
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }

        .section-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.4;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .section-title::before {
            content: '';
            width: 4px;
            height: 24px;
            background: var(--brand);
            border-radius: 4px;
            flex-shrink: 0;
        }

        .section-sub {
            font-size: 15px;
            color: var(--sub);
            margin: 0 0 32px;
            line-height: 1.8;
            max-width: 720px;
        }

        /* Cards */
        .card {
            background: var(--card);
            border-radius: var(--radius-card);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform 160ms ease;
        }

        .card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.35);
            transform: translateY(-2px);
        }

        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: #E2E8F0;
        }

        .card-body {
            padding: 20px 22px 22px;
        }

        .card-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.45;
        }

        .card-summary {
            font-size: 14px;
            color: var(--sub);
            line-height: 1.75;
            margin: 0 0 14px;
        }

        .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 14px;
        }

        .tag {
            display: inline-block;
            font-size: 12px;
            padding: 3px 10px;
            border-radius: 999px;
            background: var(--brand-50);
            color: var(--brand-dark);
            font-weight: 500;
            white-space: nowrap;
        }

        .tag-outline {
            background: #fff;
            border: 1px solid var(--line);
            color: var(--faint);
        }

        .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--brand);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .card-link:hover {
            color: var(--brand-dark);
            text-decoration: none;
            gap: 8px;
        }

        /* Page hero */
        .page-hero {
            background: linear-gradient(135deg, #EFF6FF 0%, #F8FAFC 55%, #FFFFFF 100%);
            border-bottom: 1px solid var(--line);
            padding: 40px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .page-hero::after {
            content: '';
            position: absolute;
            right: -80px;
            top: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(59, 130, 246, 0.04);
            pointer-events: none;
        }

        .page-hero-inner {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
            position: relative;
            z-index: 1;
        }

        @media (min-width: 768px) {
            .page-hero-inner {
                grid-template-columns: 1.4fr 1fr;
                align-items: center;
            }
        }

        .page-hero h1 {
            font-size: 28px;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 12px;
            line-height: 1.35;
            letter-spacing: -0.01em;
        }

        @media (max-width: 767px) {
            .page-hero h1 {
                font-size: 23px;
            }
        }

        .page-hero-desc {
            font-size: 15px;
            color: var(--sub);
            line-height: 1.85;
            margin: 0 0 20px;
            max-width: 640px;
        }

        .page-hero-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .hero-stat-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 16px 18px;
            box-shadow: var(--shadow-card);
        }

        .hero-stat-num {
            font-size: 28px;
            font-weight: 800;
            color: var(--brand);
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .hero-stat-label {
            font-size: 13px;
            color: var(--faint);
        }

        /* Filter bar */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            margin-bottom: 24px;
        }

        .filter-label {
            font-size: 14px;
            color: var(--faint);
            font-weight: 500;
            margin-right: 4px;
        }

        .filter-btn {
            font-size: 13px;
            padding: 6px 16px;
            border-radius: 999px;
            border: 1px solid var(--line);
            background: #fff;
            color: var(--sub);
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition-base);
            white-space: nowrap;
        }

        .filter-btn:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: var(--brand-50);
        }

        .filter-btn.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .filter-btn:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }

        /* Grid layout for scene cards */
        .scene-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        @media (min-width: 640px) {
            .scene-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (min-width: 1024px) {
            .scene-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 24px;
            }
        }

        /* Calculator widget */
        .calc-widget {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px;
            max-width: 640px;
            margin: 0 auto;
        }

        .calc-widget-title {
            font-size: 20px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 16px;
            text-align: center;
        }

        .calc-form-row {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
            margin-bottom: 16px;
        }

        @media (min-width: 560px) {
            .calc-form-row {
                grid-template-columns: 1fr 1fr;
            }
        }

        .calc-field label {
            font-size: 14px;
            font-weight: 600;
            color: var(--sub);
            display: block;
            margin-bottom: 6px;
        }

        .calc-field input,
        .calc-field select {
            width: 100%;
            height: 42px;
            border: 1px solid var(--line);
            border-radius: 8px;
            padding: 0 12px;
            font-size: 15px;
            color: var(--ink);
            background: #fff;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
            font-family: inherit;
        }

        .calc-field input:focus,
        .calc-field select:focus {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
            outline: none;
        }

        .calc-result {
            background: var(--brand-50);
            border: 1px solid rgba(59, 130, 246, 0.25);
            border-radius: 10px;
            padding: 18px 20px;
            margin-top: 16px;
            display: none;
        }

        .calc-result.show {
            display: block;
        }

        .calc-result-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 6px 0;
            font-size: 14px;
        }

        .calc-result-label {
            color: var(--sub);
        }

        .calc-result-value {
            font-weight: 700;
            color: var(--ink);
            font-size: 16px;
        }

        .calc-result-value.positive {
            color: var(--success);
        }

        .calc-result-value.negative {
            color: var(--danger);
        }

        .btn-calc {
            display: block;
            width: 100%;
            background: var(--brand);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            padding: 12px 24px;
            border: none;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: background-color var(--transition-base), box-shadow var(--transition-base);
            font-family: inherit;
        }

        .btn-calc:hover {
            background: var(--brand-dark);
            box-shadow: var(--shadow-lift);
        }

        /* Risk notice */
        .risk-notice {
            background: #FFFBEB;
            border: 1px solid #FDE68A;
            border-radius: 12px;
            padding: 20px 24px;
            display: flex;
            gap: 14px;
            align-items: flex-start;
        }

        .risk-icon {
            font-size: 24px;
            flex-shrink: 0;
            line-height: 1.4;
        }

        .risk-content h3 {
            font-size: 16px;
            font-weight: 700;
            color: #92400E;
            margin: 0 0 6px;
        }

        .risk-content p {
            font-size: 14px;
            color: #78350F;
            margin: 0;
            line-height: 1.75;
        }

        /* Recommend cards */
        .recommend-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
            max-width: 900px;
        }

        @media (min-width: 640px) {
            .recommend-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        .recommend-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 18px 20px;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            gap: 14px;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
            text-decoration: none;
            color: var(--ink);
        }

        .recommend-card:hover {
            border-color: rgba(59, 130, 246, 0.35);
            box-shadow: var(--shadow-lift);
            text-decoration: none;
        }

        .recommend-icon {
            width: 42px;
            height: 42px;
            background: var(--brand-50);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }

        .recommend-info h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .recommend-info p {
            font-size: 13px;
            color: var(--faint);
            margin: 0;
        }

        /* FAQ */
        .faq-list {
            display: grid;
            gap: 12px;
            max-width: 800px;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 18px 22px;
            box-shadow: var(--shadow-card);
            transition: border-color var(--transition-base);
        }

        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.3);
        }

        .faq-q {
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            display: flex;
            gap: 10px;
            align-items: flex-start;
        }

        .faq-q-dot {
            width: 8px;
            height: 8px;
            background: var(--brand);
            border-radius: 50%;
            margin-top: 8px;
            flex-shrink: 0;
        }

        .faq-a {
            font-size: 14px;
            color: var(--sub);
            line-height: 1.8;
            margin: 0 0 0 18px;
        }

        /* Form */
        .form-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px;
            max-width: 720px;
            margin: 0 auto;
        }

        .form-title {
            font-size: 20px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            text-align: center;
        }

        .form-sub {
            font-size: 14px;
            color: var(--faint);
            text-align: center;
            margin: 0 0 24px;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
            margin-bottom: 20px;
        }

        @media (min-width: 560px) {
            .form-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        .form-field label {
            font-size: 14px;
            font-weight: 600;
            color: var(--sub);
            display: block;
            margin-bottom: 6px;
        }

        .form-field input,
        .form-field select,
        .form-field textarea {
            width: 100%;
            min-height: 42px;
            border: 1px solid var(--line);
            border-radius: 8px;
            padding: 8px 12px;
            font-size: 14px;
            color: var(--ink);
            background: #fff;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
            font-family: inherit;
            resize: vertical;
        }

        .form-field textarea {
            min-height: 90px;
        }

        .form-field input:focus,
        .form-field select:focus,
        .form-field textarea:focus {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
            outline: none;
        }

        .form-submit-row {
            display: flex;
            justify-content: center;
        }

        .form-error {
            color: var(--danger);
            font-size: 12px;
            margin-top: 4px;
            display: none;
        }

        .form-success {
            color: var(--success);
            font-size: 14px;
            text-align: center;
            padding: 12px;
            background: #F0FDF4;
            border: 1px solid #BBF7D0;
            border-radius: 8px;
            margin-bottom: 16px;
            display: none;
        }

        /* Footer */
        .site-footer {
            background: #0B1220;
            color: #CBD5E1;
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
            margin-bottom: 32px;
        }

        @media (min-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
                gap: 40px;
            }
        }

        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-brand-desc {
            font-size: 13.5px;
            color: #94A3B8;
            line-height: 1.8;
            margin: 0;
        }

        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 14px;
        }

        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: grid;
            gap: 8px;
        }

        .footer-links a {
            font-size: 14px;
            color: #94A3B8;
            text-decoration: none;
            transition: color var(--transition-base);
        }

        .footer-links a:hover {
            color: #fff;
            text-decoration: none;
        }

        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 18px;
            text-align: center;
            font-size: 13px;
            color: #64748B;
        }

        @media (max-width: 767px) {
            .site-footer {
                padding: 36px 0 20px;
            }
            .footer-grid {
                gap: 20px;
            }
        }

        /* Responsive fine-tuning */
        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 20px;
            }
            .section-title {
                font-size: 20px;
            }
            .card-body {
                padding: 16px;
            }
            .card-title {
                font-size: 16px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 8px 16px;
                font-size: 14px;
            }
            .calc-widget,
            .form-card {
                padding: 18px;
            }
            .scene-grid {
                grid-template-columns: 1fr;
            }
            .filter-bar {
                gap: 6px;
            }
            .filter-btn {
                font-size: 12px;
                padding: 5px 12px;
            }
        }

/* roulang page: category5 */
:root {
            --brand: #3B82F6;
            --brand-dark: #1D4ED8;
            --brand-deep: #0F3B78;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --ink: #0F172A;
            --sub: #475569;
            --faint: #64748B;
            --line: #E2E8F0;
            --success: #16A34A;
            --warn: #D97706;
            --danger: #DC2626;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
            --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--brand);
            text-decoration: none;
            transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
        }

        a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-decoration-color: currentColor;
            text-underline-offset: 3px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }

        button:active:not(:disabled) {
            transform: scale(0.98);
        }

        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 32px;
                padding-right: 32px;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }

        /* Header & Nav */
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }

        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }

        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 19px;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .logo-link:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .logo-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--brand);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
        }

        .nav-links {
            display: none;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            padding: 4px 0;
            position: relative;
            white-space: nowrap;
            text-decoration: none;
        }

        .nav-links a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .nav-links a.active {
            color: var(--brand);
            font-weight: 700;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .hamburger {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            color: var(--ink);
            font-size: 20px;
        }

        .hamburger:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #F1F5F9;
        }

        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
            .hamburger {
                display: none;
            }
        }

        .announcement-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--line);
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .announcement-bar::-webkit-scrollbar {
            height: 4px;
        }

        .announcement-bar::-webkit-scrollbar-thumb {
            background: var(--line);
            border-radius: 2px;
        }

        .announcement-inner {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            min-width: max-content;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: #fff;
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 999px;
            font-size: 12.5px;
            color: var(--sub);
            white-space: nowrap;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
            transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
        }

        .chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #F1F5F9;
            text-decoration: none;
        }

        .chip-date {
            color: var(--faint);
            font-size: 11.5px;
            letter-spacing: 0.02em;
        }

        /* Mobile menu */
        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu-inner {
            padding: 16px 20px 20px;
        }

        .mobile-menu-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-menu-links a {
            display: block;
            padding: 10px 12px;
            font-size: 15px;
            font-weight: 500;
            color: var(--sub);
            border-radius: 8px;
            text-decoration: none;
        }

        .mobile-menu-links a:hover {
            background: #F1F5F9;
            color: var(--brand);
            text-decoration: none;
        }

        .mobile-menu-links a.active {
            background: #EFF6FF;
            color: var(--brand);
            font-weight: 700;
        }

        .mobile-menu-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--line);
        }

        /* Breadcrumb */
        .breadcrumb-section {
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 14px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--faint);
        }

        .breadcrumb a {
            color: var(--faint);
            text-decoration: none;
        }

        .breadcrumb a:hover {
            color: var(--brand);
            text-decoration: none;
        }

        .breadcrumb .sep {
            color: #CBD5E1;
        }

        .breadcrumb .current {
            color: var(--ink);
            font-weight: 500;
        }

        /* Page Title Section */
        .page-title-section {
            background: linear-gradient(180deg, #F8FAFC 0%, #F1F5F9 100%);
            padding: 48px 0 40px;
            border-bottom: 1px solid var(--line);
        }

        .page-title-section h1 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--ink);
            margin: 0 0 12px;
            letter-spacing: 0.01em;
        }

        @media (min-width: 768px) {
            .page-title-section h1 {
                font-size: 32px;
            }
        }

        .page-title-section .lead {
            font-size: 16px;
            color: var(--sub);
            max-width: 780px;
            line-height: 1.8;
            margin: 0;
        }

        /* Filter Bar */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            padding: 16px 0;
            background: #fff;
            border-bottom: 1px solid var(--line);
        }

        .filter-bar .filter-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--faint);
            letter-spacing: 0.03em;
        }

        .filter-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 999px;
            font-size: 13px;
            color: var(--sub);
            white-space: nowrap;
            transition: all var(--transition-base);
        }

        .filter-btn:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #F1F5F9;
        }

        .filter-btn.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .filter-btn .count {
            font-size: 11px;
            opacity: 0.7;
            margin-left: 2px;
        }

        /* Main Content */
        .main-content {
            padding: 40px 0 60px;
        }

        @media (min-width: 768px) {
            .main-content {
                padding: 56px 0 80px;
            }
        }

        /* Model Cards Grid */
        .model-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        @media (min-width: 768px) {
            .model-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }

        @media (min-width: 1024px) {
            .model-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 28px;
            }
        }

        .model-card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .model-card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.4);
            transform: translateY(-2px);
        }

        .model-card-img {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            background: #E2E8F0;
        }

        .model-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 300ms ease;
        }

        .model-card:hover .model-card-img img {
            transform: scale(1.03);
        }

        .model-card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .model-version {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 600;
            color: var(--brand);
            background: #EFF6FF;
            padding: 4px 10px;
            border-radius: 999px;
            margin-bottom: 10px;
            width: fit-content;
        }

        .model-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.45;
        }

        .model-card p {
            font-size: 14px;
            color: var(--sub);
            margin: 0 0 14px;
            line-height: 1.75;
            flex: 1;
        }

        .model-card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
            padding-top: 12px;
            border-top: 1px solid #F1F5F9;
        }

        .model-tag {
            font-size: 11.5px;
            color: var(--faint);
            background: #F8FAFC;
            padding: 3px 10px;
            border-radius: 999px;
        }

        /* Section Headings */
        .section-heading {
            margin-bottom: 28px;
        }

        .section-heading h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.3;
        }

        .section-heading p {
            font-size: 14px;
            color: var(--sub);
            margin: 0;
            max-width: 680px;
            line-height: 1.75;
        }

        @media (min-width: 768px) {
            .section-heading h2 {
                font-size: 26px;
            }
        }

        /* Section Block */
        .section-block {
            padding: 48px 0 0;
        }

        @media (min-width: 768px) {
            .section-block {
                padding: 64px 0 0;
            }
        }

        /* Model Compare */
        .compare-table-wrap {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
        }

        .compare-table th {
            background: #F8FAFC;
            font-weight: 600;
            color: var(--sub);
            text-align: left;
            padding: 14px 18px;
            border-bottom: 1px solid var(--line);
            font-size: 13px;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .compare-table td {
            padding: 14px 18px;
            border-bottom: 1px solid #F1F5F9;
            color: var(--sub);
            vertical-align: top;
        }

        .compare-table tr:last-child td {
            border-bottom: none;
        }

        .compare-table .model-name {
            font-weight: 600;
            color: var(--ink);
            white-space: nowrap;
        }

        .compare-table .badge-v3 {
            display: inline-block;
            background: #EFF6FF;
            color: var(--brand);
            font-weight: 600;
            font-size: 12px;
            padding: 2px 8px;
            border-radius: 4px;
            margin-left: 6px;
        }

        .compare-table .badge-v2 {
            display: inline-block;
            background: #F1F5F9;
            color: var(--sub);
            font-weight: 600;
            font-size: 12px;
            padding: 2px 8px;
            border-radius: 4px;
            margin-left: 6px;
        }

        /* Rules Panel */
        .rules-panel {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 26px 28px;
        }

        @media (min-width: 768px) {
            .rules-panel {
                padding: 32px 36px;
            }
        }

        .rules-panel .rule-item {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid #F1F5F9;
        }

        .rules-panel .rule-item:first-child {
            padding-top: 0;
        }

        .rules-panel .rule-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .rule-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #EFF6FF;
            color: var(--brand);
            border-radius: 6px;
            font-size: 14px;
            font-weight: 700;
        }

        .rule-item h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .rule-item p {
            font-size: 14px;
            color: var(--sub);
            margin: 0;
            line-height: 1.7;
        }

        /* Update Log */
        .update-log-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .update-log-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 18px 22px;
            display: flex;
            align-items: flex-start;
            gap: 16px;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
        }

        .update-log-item:hover {
            border-color: rgba(59, 130, 246, 0.35);
            box-shadow: var(--shadow-lift);
        }

        .update-date {
            flex-shrink: 0;
            min-width: 84px;
            text-align: center;
            background: #F1F5F9;
            border-radius: 8px;
            padding: 8px 10px;
            font-size: 12px;
            color: var(--sub);
            font-weight: 600;
            line-height: 1.4;
        }

        .update-date .day {
            display: block;
            font-size: 18px;
            color: var(--ink);
            font-weight: 700;
        }

        .update-log-item h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .update-log-item p {
            font-size: 13px;
            color: var(--sub);
            margin: 0;
            line-height: 1.7;
        }

        /* Related Tools */
        .related-tools-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }

        @media (min-width: 768px) {
            .related-tools-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .related-tools-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .related-tool-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 20px;
            text-align: center;
            transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
            display: block;
            text-decoration: none !important;
        }

        .related-tool-card:hover {
            border-color: var(--brand);
            box-shadow: var(--shadow-lift);
            transform: translateY(-2px);
        }

        .related-tool-card .tool-icon {
            font-size: 32px;
            margin-bottom: 10px;
            display: block;
        }

        .related-tool-card h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 6px;
        }

        .related-tool-card p {
            font-size: 13px;
            color: var(--faint);
            margin: 0;
            line-height: 1.6;
        }

        /* FAQ Section */
        .faq-section {
            background: #fff;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            padding: 48px 0;
        }

        @media (min-width: 768px) {
            .faq-section {
                padding: 64px 0;
            }
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 820px;
        }

        .faq-item {
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 18px 22px;
            background: #fff;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
        }

        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.3);
            box-shadow: var(--shadow-card);
        }

        .faq-item h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 8px;
            line-height: 1.5;
            display: flex;
            align-items: baseline;
            gap: 10px;
        }

        .faq-item h3 .q-num {
            color: var(--brand);
            font-weight: 700;
            font-size: 14px;
            flex-shrink: 0;
        }

        .faq-item p {
            font-size: 14px;
            color: var(--sub);
            margin: 0;
            line-height: 1.75;
            padding-left: 24px;
        }

        /* CTA Section */
        .cta-section {
            padding: 48px 0 0;
        }

        @media (min-width: 768px) {
            .cta-section {
                padding: 64px 0 0;
            }
        }

        .cta-panel {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 32px 28px;
            display: flex;
            flex-direction: column;
            gap: 20px;
            align-items: flex-start;
        }

        @media (min-width: 768px) {
            .cta-panel {
                flex-direction: row;
                align-items: center;
                justify-content: space-between;
                padding: 36px 40px;
            }
        }

        .cta-panel h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 6px;
            line-height: 1.3;
        }

        .cta-panel p {
            font-size: 14px;
            color: var(--sub);
            margin: 0;
            line-height: 1.7;
            max-width: 520px;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 24px;
            border-radius: var(--radius-btn);
            border: none;
            white-space: nowrap;
            text-decoration: none !important;
            transition: background-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }

        .cta-btn:hover {
            background: var(--brand-dark);
            box-shadow: 0 4px 14px rgba(59, 130, 246, 0.25);
            transform: translateY(-1px);
        }

        .cta-btn:active {
            transform: scale(0.98);
        }

        /* Button Primary */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            border: none;
            text-decoration: none !important;
            transition: background-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            box-shadow: 0 4px 14px rgba(59, 130, 246, 0.25);
            text-decoration: none;
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--brand);
            font-weight: 600;
            font-size: 14px;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            border: 1px solid var(--brand);
            text-decoration: none !important;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform 120ms ease;
        }

        .btn-secondary:hover {
            background: #EFF6FF;
            color: var(--brand-dark);
            border-color: var(--brand-dark);
            text-decoration: none;
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        /* Footer */
        .site-footer {
            background: #0B1220;
            color: #CBD5E1;
            padding: 48px 0 0;
            margin-top: 0;
        }

        @media (min-width: 768px) {
            .site-footer {
                padding: 64px 0 0;
            }
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
            padding-bottom: 36px;
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr 1fr;
                gap: 32px;
            }
        }

        @media (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr 1fr;
            }
        }

        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 10px;
            letter-spacing: 0.01em;
        }

        .footer-brand-desc {
            font-size: 13px;
            color: #94A3B8;
            margin: 0;
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-title {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 12px;
            letter-spacing: 0.03em;
        }

        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 13px;
            color: #94A3B8;
            text-decoration: none;
            transition: color var(--transition-base);
        }

        .footer-links a:hover {
            color: #fff;
            text-decoration: none;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 18px 0;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 12px;
            color: #64748B;
            margin: 0;
            line-height: 1.6;
        }

        /* Extra responsive fixes */
        @media (max-width: 520px) {
            .page-title-section {
                padding: 32px 0 28px;
            }
            .page-title-section h1 {
                font-size: 24px;
            }
            .model-card-body {
                padding: 16px 18px 18px;
            }
            .rules-panel {
                padding: 20px 18px;
            }
            .cta-panel {
                padding: 24px 20px;
            }
            .faq-item {
                padding: 14px 16px;
            }
        }

/* roulang page: category6 */
:root {
            --brand: #3B82F6;
            --brand-dark: #1D4ED8;
            --brand-deep: #0F3B78;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --ink: #0F172A;
            --sub: #475569;
            --faint: #64748B;
            --line: #E2E8F0;
            --success: #16A34A;
            --warn: #D97706;
            --danger: #DC2626;
            --radius-card: 14px;
            --radius-btn: 10px;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow-lift: 0 8px 24px rgba(59, 130, 246, 0.12), 0 2px 6px rgba(15, 23, 42, 0.08);
            --transition-base: 180ms cubic-bezier(0.4, 0, 0.2, 1);
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans CN", system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--brand);
            text-decoration: none;
            transition: color var(--transition-base), opacity var(--transition-base), text-decoration-color var(--transition-base);
        }
        a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
            text-decoration-color: currentColor;
            text-underline-offset: 3px;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }
        button:active:not(:disabled) {
            transform: scale(0.98);
        }
        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 32px;
                padding-right: 32px;
            }
        }
        @media (min-width: 1024px) {
            .container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }
        /* Header & Nav */
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 24px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 19px;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .logo-link:hover {
            color: var(--brand);
            text-decoration: none;
        }
        .logo-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--brand);
            color: #fff;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
        }
        .nav-links {
            display: none;
            align-items: center;
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            padding: 4px 0;
            position: relative;
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links a:hover {
            color: var(--brand);
            text-decoration: none;
        }
        .nav-links a.active {
            color: var(--brand);
            font-weight: 700;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .hamburger {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border: 1px solid var(--line);
            border-radius: 8px;
            background: #fff;
            color: var(--ink);
            font-size: 20px;
        }
        .hamburger:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: #fff;
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 999px;
            font-size: 12.5px;
            color: var(--sub);
            white-space: nowrap;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
            transition: border-color var(--transition-base), color var(--transition-base), background var(--transition-base);
        }
        .chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
            text-decoration: none;
        }
        .chip-date {
            color: var(--faint);
            font-size: 11.5px;
            letter-spacing: 0.02em;
        }
        /* Announcement bar */
        .announcement-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--line);
            padding: 8px 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
        .announcement-inner {
            display: flex;
            gap: 10px;
            align-items: center;
            min-width: max-content;
        }
        /* Mobile menu */
        .mobile-menu {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 16px 0;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu-inner {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu-links a {
            display: block;
            padding: 12px 16px;
            font-size: 15px;
            color: var(--sub);
            font-weight: 500;
            border-radius: 8px;
            text-decoration: none;
        }
        .mobile-menu-links a:hover {
            background: #F1F5F9;
            color: var(--brand);
            text-decoration: none;
        }
        .mobile-menu-links a.active {
            background: #EFF6FF;
            color: var(--brand);
            font-weight: 700;
        }
        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
            .hamburger {
                display: none;
            }
            .mobile-menu {
                display: none !important;
            }
        }
        /* Breadcrumb */
        .breadcrumb-section {
            background: #fff;
            border-bottom: 1px solid var(--line);
            padding: 14px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--faint);
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb li + li::before {
            content: '/';
            color: #CBD5E1;
            font-size: 12px;
        }
        .breadcrumb a {
            color: var(--sub);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--brand);
            text-decoration: none;
        }
        .breadcrumb .current {
            color: var(--ink);
            font-weight: 600;
        }
        /* Page Header */
        .page-header-section {
            background: linear-gradient(135deg, #EFF6FF 0%, #F8FAFC 55%, #F1F5F9 100%);
            border-bottom: 1px solid var(--line);
            padding: 48px 0 40px;
        }
        .page-header-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
            align-items: center;
        }
        @media (min-width: 768px) {
            .page-header-grid {
                grid-template-columns: 3fr 2fr;
                gap: 40px;
            }
        }
        .page-header-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--ink);
            margin: 0 0 12px;
            letter-spacing: 0.01em;
        }
        @media (min-width: 768px) {
            .page-header-title {
                font-size: 34px;
            }
        }
        .page-header-desc {
            font-size: 15px;
            color: var(--sub);
            line-height: 1.8;
            margin: 0 0 20px;
            max-width: 640px;
        }
        .page-header-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
        }
        .header-stat {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .header-stat-num {
            font-size: 28px;
            font-weight: 700;
            color: var(--brand);
            line-height: 1.2;
            font-family: "Inter", "Roboto", "DIN Alternate", system-ui, sans-serif;
        }
        .header-stat-label {
            font-size: 12px;
            color: var(--faint);
        }
        .header-visual-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .header-visual-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 8px 0;
            border-bottom: 1px solid #F1F5F9;
        }
        .header-visual-row:last-child {
            border-bottom: none;
        }
        .header-visual-label {
            font-size: 13px;
            color: var(--faint);
        }
        .header-visual-value {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            font-family: "Inter", "Roboto", "DIN Alternate", system-ui, sans-serif;
        }
        .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: #DCFCE7;
            color: #16A34A;
        }
        .status-badge.warn {
            background: #FEF3C7;
            color: #D97706;
        }
        .status-badge.info {
            background: #DBEAFE;
            color: #1D4ED8;
        }
        /* Section common */
        .section-block {
            padding: 56px 0;
        }
        @media (min-width: 768px) {
            .section-block {
                padding: 72px 0;
            }
        }
        .section-heading {
            font-size: 22px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 8px;
            letter-spacing: 0.01em;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        @media (min-width: 768px) {
            .section-heading {
                font-size: 26px;
            }
        }
        .section-heading::before {
            content: '';
            width: 4px;
            height: 24px;
            background: var(--brand);
            border-radius: 2px;
            flex-shrink: 0;
        }
        .section-subtitle {
            font-size: 14px;
            color: var(--faint);
            margin: 0 0 32px;
            line-height: 1.7;
        }
        /* Notice list */
        .notice-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        @media (min-width: 768px) {
            .notice-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (min-width: 1024px) {
            .notice-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .notice-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
        }
        .notice-card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.35);
            transform: translateY(-2px);
        }
        .notice-card.featured {
            grid-column: 1 / -1;
            border-color: rgba(59, 130, 246, 0.4);
            background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFC 100%);
            box-shadow: 0 2px 12px rgba(59, 130, 246, 0.08);
            padding: 28px;
        }
        @media (min-width: 768px) {
            .notice-card.featured {
                padding: 32px;
                display: grid;
                grid-template-columns: 1fr auto;
                gap: 24px;
                align-items: center;
            }
        }
        .notice-card-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
        }
        .notice-date {
            font-size: 12.5px;
            color: var(--faint);
            font-weight: 500;
            letter-spacing: 0.02em;
        }
        .notice-tag {
            display: inline-flex;
            align-items: center;
            padding: 3px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: #EFF6FF;
            color: #1D4ED8;
        }
        .notice-tag.rule {
            background: #FEF3C7;
            color: #D97706;
        }
        .notice-tag.data {
            background: #DCFCE7;
            color: #16A34A;
        }
        .notice-tag.model {
            background: #F3E8FF;
            color: #7C3AED;
        }
        .notice-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.45;
            margin: 0;
        }
        .notice-card.featured .notice-title {
            font-size: 20px;
        }
        @media (min-width: 768px) {
            .notice-card.featured .notice-title {
                font-size: 22px;
            }
        }
        .notice-summary {
            font-size: 14px;
            color: var(--sub);
            line-height: 1.75;
            margin: 0;
            flex-grow: 1;
        }
        .notice-link {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            text-decoration: none;
        }
        .notice-link:hover {
            color: var(--brand-dark);
            text-decoration: none;
        }
        .notice-link .arrow {
            transition: transform var(--transition-base);
        }
        .notice-link:hover .arrow {
            transform: translateX(3px);
        }
        /* Filter bar */
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 24px;
        }
        .filter-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 7px 18px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
            background: #fff;
            border: 1px solid var(--line);
            color: var(--sub);
            transition: all var(--transition-base);
            white-space: nowrap;
        }
        .filter-btn:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
        }
        .filter-btn.active {
            background: var(--brand);
            border-color: var(--brand);
            color: #fff;
            font-weight: 600;
        }
        /* Data disclosure panel */
        .disclosure-panel {
            background: var(--brand-deep);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            color: #E2E8F0;
            position: relative;
            overflow: hidden;
        }
        @media (min-width: 768px) {
            .disclosure-panel {
                padding: 40px 36px;
                display: grid;
                grid-template-columns: 1.2fr 1fr;
                gap: 32px;
                align-items: center;
            }
        }
        .disclosure-panel::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(59, 130, 246, 0.15);
        }
        .disclosure-panel::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: 20%;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(59, 130, 246, 0.08);
        }
        .disclosure-content {
            position: relative;
            z-index: 1;
        }
        .disclosure-title {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
            line-height: 1.4;
        }
        .disclosure-text {
            font-size: 14px;
            color: #CBD5E1;
            line-height: 1.8;
            margin: 0;
        }
        .disclosure-list {
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .disclosure-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 13.5px;
            color: #E2E8F0;
            line-height: 1.6;
        }
        .disclosure-item .dot {
            flex-shrink: 0;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--brand);
            margin-top: 7px;
        }
        /* Subscribe */
        .subscribe-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px;
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            align-items: center;
        }
        @media (min-width: 768px) {
            .subscribe-card {
                grid-template-columns: 1fr auto;
                padding: 32px;
                gap: 32px;
            }
        }
        .subscribe-info h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
        }
        .subscribe-info p {
            font-size: 14px;
            color: var(--sub);
            margin: 0;
            line-height: 1.7;
        }
        .subscribe-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .subscribe-form input[type="email"],
        .subscribe-form input[type="text"] {
            flex: 1;
            min-width: 200px;
            height: 44px;
            padding: 0 16px;
            border: 1px solid var(--line);
            border-radius: var(--radius-btn);
            font-size: 14px;
            color: var(--ink);
            background: #F8FAFC;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
            font-family: inherit;
        }
        .subscribe-form input:focus {
            outline: none;
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
            background: #fff;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 0 24px;
            height: 44px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            background: var(--brand);
            color: #fff;
            border: none;
            white-space: nowrap;
            transition: background-color var(--transition-base), box-shadow var(--transition-base), transform 120ms ease;
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
        }
        /* FAQ inline */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 18px 20px;
            transition: border-color var(--transition-base), box-shadow var(--transition-base);
        }
        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.3);
            box-shadow: var(--shadow-card);
        }
        .faq-question {
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .faq-question .q-dot {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: #EFF6FF;
            color: var(--brand);
            font-size: 12px;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-top: 2px;
        }
        .faq-answer {
            font-size: 14px;
            color: var(--sub);
            line-height: 1.75;
            margin: 0;
            padding-left: 32px;
        }
        /* Related tools */
        .related-tools-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }
        @media (min-width: 768px) {
            .related-tools-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 20px;
            }
        }
        .tool-mini-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 18px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            text-decoration: none;
            transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
        }
        .tool-mini-card:hover {
            box-shadow: var(--shadow-lift);
            border-color: rgba(59, 130, 246, 0.35);
            transform: translateY(-2px);
            text-decoration: none;
        }
        .tool-mini-card .tool-icon {
            font-size: 22px;
        }
        .tool-mini-card .tool-name {
            font-size: 14px;
            font-weight: 700;
            color: var(--ink);
        }
        .tool-mini-card .tool-desc {
            font-size: 12.5px;
            color: var(--faint);
            line-height: 1.6;
            margin: 0;
        }
        .tool-mini-card:hover .tool-name {
            color: var(--brand);
        }
        /* Footer */
        .site-footer {
            background: #0B1220;
            color: #CBD5E1;
            padding: 48px 0 24px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr 1fr;
                gap: 40px;
            }
        }
        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 10px;
        }
        .footer-brand-desc {
            font-size: 13px;
            color: #94A3B8;
            line-height: 1.7;
            margin: 0;
            max-width: 300px;
        }
        .footer-title {
            font-size: 14px;
            font-weight: 600;
            color: #E2E8F0;
            margin: 0 0 12px;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            font-size: 13px;
            color: #94A3B8;
            text-decoration: none;
            transition: color var(--transition-base);
        }
        .footer-links a:hover {
            color: #fff;
            text-decoration: none;
        }
        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, 0.2);
            padding-top: 20px;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 12.5px;
            color: #64748B;
            margin: 0;
        }
        /* CTA panel */
        .cta-panel {
            background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
            border: 1px solid rgba(59, 130, 246, 0.25);
            border-radius: var(--radius-card);
            padding: 36px 28px;
            text-align: center;
        }
        @media (min-width: 768px) {
            .cta-panel {
                padding: 48px 40px;
            }
        }
        .cta-panel h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 10px;
        }
        .cta-panel p {
            font-size: 14px;
            color: var(--sub);
            margin: 0 0 24px;
            line-height: 1.7;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 0 28px;
            height: 44px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            background: #fff;
            color: var(--brand);
            border: 1.5px solid var(--brand);
            white-space: nowrap;
            transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
        }
        .btn-secondary:hover {
            background: #EFF6FF;
            border-color: var(--brand-dark);
            color: var(--brand-dark);
        }
        /* Notice image */
        .notice-image {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 8px;
            margin-bottom: 4px;
        }
        @media (min-width: 768px) {
            .notice-image {
                height: 140px;
            }
        }
        .notice-card.featured .notice-image {
            height: 200px;
            margin-bottom: 8px;
        }
        @media (min-width: 768px) {
            .notice-card.featured .notice-image {
                height: 180px;
                max-width: 280px;
                margin-bottom: 0;
            }
        }
        /* Responsive utilities */
        @media (max-width: 767px) {
            .section-block {
                padding: 40px 0;
            }
            .page-header-section {
                padding: 32px 0 28px;
            }
            .page-header-title {
                font-size: 24px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .notice-card {
                padding: 18px;
            }
            .notice-card.featured {
                padding: 20px;
            }
            .related-tools-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .tool-mini-card {
                padding: 14px;
            }
            .subscribe-card {
                padding: 20px;
            }
        }