/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2c3e7a;
            --primary-dark: #0f1a4a;
            --accent: #f0a030;
            --accent-light: #f5b84e;
            --accent-dark: #d4942b;
            --bg-body: #f8f9fc;
            --bg-white: #ffffff;
            --bg-light: #eef1f7;
            --bg-dark: #121a33;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8a8aaa;
            --text-white: #ffffff;
            --border-light: #e2e5ef;
            --border-medium: #c8cde0;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 108, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 42, 108, 0.10);
            --shadow-lg: 0 16px 48px rgba(26, 42, 108, 0.14);
            --shadow-accent: 0 6px 24px rgba(240, 160, 48, 0.30);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --tab-height: 64px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-body);
            min-height: 100vh;
            padding-top: var(--header-height);
            padding-bottom: var(--tab-height);
        }
        @media (min-width: 769px) {
            body {
                padding-bottom: 0;
            }
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        a:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header & Desktop Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
        }
        .site-logo i {
            color: var(--accent);
            font-size: 26px;
        }
        .site-logo:hover {
            color: var(--primary);
        }
        .site-logo span {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 600;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a i {
            font-size: 15px;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-light);
        }
        .main-nav a:hover i {
            color: var(--accent);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--bg-light);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }
        .main-nav a.active i {
            color: var(--accent);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-actions .search-toggle {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            font-size: 18px;
            transition: all var(--transition);
        }
        .header-actions .search-toggle:hover {
            background: var(--primary);
            color: var(--text-white);
        }
        .btn-cta-nav {
            padding: 8px 22px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--text-white) !important;
            font-weight: 700;
            font-size: 14px;
            transition: all var(--transition);
            box-shadow: var(--shadow-accent);
        }
        .btn-cta-nav:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(240, 160, 48, 0.40);
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-tab-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1001;
            height: var(--tab-height);
            background: var(--bg-white);
            border-top: 1px solid var(--border-light);
            box-shadow: 0 -2px 12px rgba(26, 42, 108, 0.06);
            justify-content: space-around;
            align-items: center;
            padding: 0 8px;
            padding-bottom: env(safe-area-inset-bottom, 0);
        }
        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-md);
            color: var(--text-muted);
            font-size: 11px;
            font-weight: 500;
            transition: all var(--transition);
            min-width: 56px;
            text-decoration: none;
        }
        .tab-item i {
            font-size: 20px;
            transition: color var(--transition);
        }
        .tab-item:hover {
            color: var(--primary);
            background: var(--bg-light);
        }
        .tab-item.active {
            color: var(--primary);
        }
        .tab-item.active i {
            color: var(--accent);
        }
        .tab-item.active::after {
            content: '';
            display: block;
            width: 20px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            margin-top: 2px;
        }
        .tab-item .tab-label {
            font-size: 10px;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            .mobile-tab-bar {
                display: flex;
            }
            .main-nav,
            .header-actions .search-toggle {
                display: none;
            }
            .header-inner {
                padding: 0 16px;
            }
            .site-logo {
                font-size: 18px;
            }
            .site-logo i {
                font-size: 20px;
            }
            .btn-cta-nav {
                padding: 6px 16px;
                font-size: 12px;
            }
        }
        @media (min-width: 769px) {
            .mobile-tab-bar {
                display: none !important;
            }
        }

        /* ===== Hero Section ===== */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background: var(--bg-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.45;
            transform: scale(1.05);
            transition: transform 8s ease;
        }
        .hero:hover .hero-bg {
            transform: scale(1);
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 74, 0.85) 0%, rgba(26, 42, 108, 0.60) 50%, rgba(240, 160, 48, 0.20) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 80px 20px;
            width: 100%;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            padding: 6px 18px;
            border-radius: 50px;
            color: var(--text-white);
            font-size: 13px;
            font-weight: 500;
            border: 1px solid rgba(255, 255, 255, 0.15);
            margin-bottom: 24px;
        }
        .hero-badge i {
            color: var(--accent);
            font-size: 14px;
        }
        .hero-title {
            font-size: clamp(32px, 6vw, 60px);
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.15;
            max-width: 720px;
            margin-bottom: 20px;
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, var(--accent), #ffd280);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: clamp(16px, 2vw, 20px);
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--text-white);
            font-weight: 700;
            font-size: 16px;
            transition: all var(--transition);
            box-shadow: var(--shadow-accent);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(240, 160, 48, 0.45);
            color: var(--text-white);
        }
        .btn-primary:active {
            transform: translateY(-1px);
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            border: 2px solid rgba(255, 255, 255, 0.30);
            color: var(--text-white);
            font-weight: 600;
            font-size: 16px;
            transition: all var(--transition);
            background: transparent;
        }
        .btn-outline-light:hover {
            border-color: var(--accent);
            background: rgba(240, 160, 48, 0.12);
            color: var(--text-white);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
        }
        .hero-stat-item {
            text-align: left;
        }
        .hero-stat-number {
            font-size: 28px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .hero {
                min-height: 420px;
            }
            .hero-content {
                padding: 60px 16px;
            }
            .hero-stats {
                gap: 24px;
                margin-top: 32px;
                padding-top: 24px;
            }
            .hero-stat-number {
                font-size: 22px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary,
            .btn-outline-light {
                justify-content: center;
            }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 48px;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 16px;
            border-radius: 50px;
            background: var(--bg-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
            border: 1px solid var(--border-light);
        }
        .section-label i {
            color: var(--accent);
            font-size: 13px;
        }
        .section-title {
            font-size: clamp(26px, 3.5vw, 38px);
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .section-sub {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .section.bg-light {
            background: var(--bg-light);
        }
        .section.bg-white {
            background: var(--bg-white);
        }
        .section.bg-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section.bg-dark .section-title {
            color: var(--text-white);
        }
        .section.bg-dark .section-sub {
            color: rgba(255, 255, 255, 0.75);
        }
        .section.bg-dark .section-label {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(255, 255, 255, 0.15);
            color: var(--text-white);
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ===== Intro / About ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .intro-image:hover img {
            transform: scale(1.03);
        }
        .intro-image .image-badge {
            position: absolute;
            bottom: 16px;
            left: 16px;
            background: var(--bg-white);
            padding: 8px 18px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 14px;
            color: var(--primary);
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .intro-image .image-badge i {
            color: var(--accent);
        }
        .intro-text h3 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--text-primary);
        }
        .intro-text p {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-top: 24px;
        }
        .intro-feature-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-primary);
            padding: 8px 12px;
            background: var(--bg-light);
            border-radius: var(--radius-sm);
        }
        .intro-feature-item i {
            color: var(--accent);
            font-size: 16px;
        }
        @media (max-width: 768px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-image img {
                height: 260px;
            }
            .intro-features {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Category / Platform Guide ===== */
        .category-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
            display: block;
            color: inherit;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent);
            color: inherit;
        }
        .category-card .card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .category-card .card-body {
            padding: 24px 20px 28px;
        }
        .category-card .card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: var(--bg-light);
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .category-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .category-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .category-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            color: var(--accent);
            font-size: 14px;
            transition: gap var(--transition);
        }
        .category-card:hover .card-link {
            gap: 10px;
        }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        @media (max-width: 768px) {
            .category-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Latest Posts (CMS) ===== */
        .post-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .post-card .post-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .post-card .post-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .post-card .post-meta .post-category {
            padding: 2px 10px;
            background: var(--bg-light);
            border-radius: 50px;
            color: var(--primary);
            font-weight: 600;
        }
        .post-card .post-meta .post-date {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .post-card .post-meta .post-date i {
            font-size: 12px;
        }
        .post-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-primary);
        }
        .post-card h3 a {
            color: inherit;
        }
        .post-card h3 a:hover {
            color: var(--accent);
        }
        .post-card .post-excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            margin-bottom: 12px;
        }
        .post-card .post-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .post-card .post-footer .read-more {
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            display: flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition);
        }
        .post-card .post-footer .read-more:hover {
            gap: 8px;
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .posts-empty {
            text-align: center;
            padding: 48px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px dashed var(--border-medium);
            color: var(--text-muted);
            font-size: 16px;
        }
        .posts-empty i {
            font-size: 40px;
            color: var(--border-medium);
            margin-bottom: 16px;
            display: block;
        }
        @media (max-width: 768px) {
            .posts-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Features / Advantages ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-white);
            padding: 32px 24px 28px;
            border-radius: var(--radius-lg);
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: var(--bg-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--accent);
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: var(--text-white);
            transform: scale(1.1);
        }
        .feature-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Process / Steps ===== */
        .process-steps {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: center;
            counter-reset: step;
        }
        .process-step {
            flex: 1 1 200px;
            max-width: 240px;
            text-align: center;
            position: relative;
            padding: 32px 16px 24px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .process-step .step-number {
            width: 44px;
            height: 44px;
            margin: 0 auto 16px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 800;
            transition: all var(--transition);
        }
        .process-step:hover .step-number {
            background: var(--accent);
            transform: scale(1.1);
        }
        .process-step h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .process-step p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .process-steps {
                gap: 16px;
            }
            .process-step {
                flex: 1 1 160px;
                max-width: 180px;
                padding: 24px 12px 20px;
            }
        }
        @media (max-width: 480px) {
            .process-step {
                flex: 1 1 100%;
                max-width: 100%;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-medium);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-light);
        }
        .faq-question i {
            font-size: 18px;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 20px;
        }
        @media (max-width: 768px) {
            .faq-question {
                font-size: 15px;
                padding: 14px 16px;
            }
            .faq-answer {
                font-size: 14px;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.10;
        }
        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 60px 20px;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: clamp(24px, 3vw, 36px);
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-content p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.80);
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .cta-content .btn-primary {
            font-size: 17px;
            padding: 16px 40px;
        }
        .cta-content .btn-primary i {
            font-size: 18px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo {
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .footer-brand .site-logo span {
            background: linear-gradient(135deg, #fff, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.60);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.60);
            transition: color var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .footer-col ul li a i {
            font-size: 12px;
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.55);
            font-size: 16px;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Scroll to Top ===== */
        .scroll-top {
            position: fixed;
            bottom: 80px;
            right: 20px;
            z-index: 999;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: all var(--transition);
            border: none;
        }
        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .scroll-top:hover {
            background: var(--accent);
            transform: translateY(-4px);
        }
        @media (max-width: 768px) {
            .scroll-top {
                bottom: 80px;
                right: 16px;
                width: 40px;
                height: 40px;
                font-size: 16px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 520px) {
            .hero-title {
                font-size: 26px;
            }
            .hero-desc {
                font-size: 15px;
            }
            .section-title {
                font-size: 22px;
            }
            .btn-primary,
            .btn-outline-light {
                padding: 12px 24px;
                font-size: 14px;
            }
            .category-card .card-image {
                height: 160px;
            }
            .post-card .post-image {
                height: 150px;
            }
        }
        @media (min-width: 1024px) {
            .hero {
                min-height: 600px;
            }
            .hero-content {
                padding: 100px 20px;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --secondary: #f59e0b;
            --accent: #10b981;
            --bg-body: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.10);
            --shadow-btn: 0 4px 14px rgba(37, 99, 235, 0.30);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --transition: 0.25s ease;
            --spacing-section: 80px;
            --spacing-block: 48px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 标题层级 ===== */
        h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 2.0rem;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            line-height: 1.4;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            line-height: 1.5;
        }

        /* ===== Header / 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
        }

        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .site-logo i {
            font-size: 1.6rem;
            color: var(--primary);
        }
        .site-logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .site-logo:hover {
            color: var(--text-primary);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }
        .main-nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .main-nav a i {
            font-size: 1rem;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .search-toggle {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            font-size: 1.1rem;
            transition: all var(--transition);
        }
        .search-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }

        .btn-cta-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 24px;
            border-radius: 40px;
            background: var(--primary);
            color: #fff !important;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-btn);
            white-space: nowrap;
        }
        .btn-cta-nav i {
            font-size: 0.85rem;
        }
        .btn-cta-nav:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
        }

        /* ===== 移动端底部 Tab ===== */
        .mobile-bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-light);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            justify-content: space-around;
            box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.04);
        }
        .mobile-bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 8px 12px;
            font-size: 0.7rem;
            color: var(--text-muted);
            border-radius: 12px;
            transition: all var(--transition);
            min-width: 64px;
        }
        .mobile-bottom-tab a i {
            font-size: 1.3rem;
        }
        .mobile-bottom-tab a.active {
            color: var(--primary);
            background: var(--primary-light);
        }
        .mobile-bottom-tab a:hover {
            color: var(--primary);
        }

        /* ===== 分类 Banner ===== */
        .category-banner {
            background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
            position: relative;
            padding: 80px 0 60px;
            color: #fff;
            overflow: hidden;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-banner h1 {
            font-size: 2.6rem;
            margin-bottom: 16px;
        }
        .category-banner h1 i {
            color: var(--secondary);
            margin-right: 12px;
        }
        .category-banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.80);
            max-width: 680px;
            margin: 0 auto 24px;
            line-height: 1.8;
        }
        .category-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.60);
        }
        .category-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
        }
        .category-banner .breadcrumb a:hover {
            color: #fff;
        }
        .category-banner .breadcrumb span {
            color: var(--secondary);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-title .subtitle-badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 40px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        /* ===== 引导步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step-counter;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .step-card .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .step-card h3 {
            margin-bottom: 8px;
            font-size: 1.15rem;
        }
        .step-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* ===== 功能卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 28px;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .feature-card .icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            margin-bottom: 18px;
        }
        .feature-card h3 {
            margin-bottom: 10px;
        }
        .feature-card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .feature-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }
        .feature-card .tag-list span {
            padding: 2px 12px;
            border-radius: 20px;
            background: var(--bg-alt);
            color: var(--text-secondary);
            font-size: 0.8rem;
            border: 1px solid var(--border);
        }

        /* ===== 图文区块 ===== */
        .content-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .content-block.reverse {
            direction: rtl;
        }
        .content-block.reverse>* {
            direction: ltr;
        }
        .content-block .text-side h2 {
            margin-bottom: 16px;
        }
        .content-block .text-side p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .content-block .text-side ul {
            margin-bottom: 20px;
        }
        .content-block .text-side ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 6px 0;
            color: var(--text-secondary);
            font-size: 0.98rem;
        }
        .content-block .text-side ul li i {
            color: var(--accent);
            margin-top: 4px;
            flex-shrink: 0;
        }
        .content-block .image-side img {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        /* ===== 内容卡片列表 ===== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .article-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .article-card .card-img {
            height: 200px;
            background: var(--bg-alt);
            overflow: hidden;
        }
        .article-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .article-card:hover .card-img img {
            transform: scale(1.05);
        }
        .article-card .card-body {
            padding: 24px 20px 20px;
        }
        .article-card .card-cat {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.78rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .article-card .card-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }
        .article-card .card-body p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .article-card .card-body .meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.82rem;
            color: var(--text-muted);
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .article-card .card-body .meta i {
            margin-right: 4px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item.open {
            border-color: var(--primary);
        }
        .faq-question {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            font-size: 1.02rem;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            text-align: left;
            transition: background var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            background: var(--bg-alt);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.75;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
            color: #fff;
            text-align: center;
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.80);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: 40px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(37, 99, 235, 0.40);
            color: #fff;
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            border-radius: 40px;
            border: 2px solid rgba(255, 255, 255, 0.40);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            background: transparent;
        }
        .btn-outline-light:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-3px);
            color: #fff;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 32px;
        }
        .site-footer .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .site-logo {
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-brand .site-logo i {
            color: var(--secondary);
        }
        .footer-brand p {
            font-size: 0.92rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.60);
            max-width: 360px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.60);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: color var(--transition);
        }
        .footer-col ul li a i {
            font-size: 0.6rem;
        }
        .footer-col ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.50);
            font-size: 1rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .content-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .content-block.reverse {
                direction: ltr;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .category-banner h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
                --spacing-section: 52px;
            }
            .main-nav {
                display: none;
            }
            .header-actions .btn-cta-nav {
                display: none;
            }
            .mobile-bottom-tab {
                display: flex;
            }
            body {
                padding-bottom: 68px;
            }
            .header-inner {
                padding: 0 16px;
            }
            .site-logo {
                font-size: 1.15rem;
            }
            .site-logo i {
                font-size: 1.3rem;
            }

            .category-banner {
                padding: 56px 0 40px;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .category-banner p {
                font-size: 1rem;
            }

            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .step-card {
                padding: 24px 16px;
            }

            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .btn-primary,
            .btn-outline-light {
                padding: 12px 28px;
                font-size: 0.92rem;
            }
            .content-block .text-side h2 {
                font-size: 1.4rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .category-banner h1 {
                font-size: 1.5rem;
            }
            .category-banner h1 i {
                font-size: 1.3rem;
                margin-right: 8px;
            }
            h2 {
                font-size: 1.4rem;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.9rem;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .article-card .card-body {
                padding: 18px 16px 16px;
            }
            .mobile-bottom-tab a {
                min-width: 48px;
                padding: 6px 8px;
                font-size: 0.65rem;
            }
            .mobile-bottom-tab a i {
                font-size: 1.2rem;
            }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a5fb4;
            --primary-dark: #0d3b7a;
            --primary-light: #e8f0fe;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg: #f9fafb;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-weak: #64748b;
            --text-inverse: #ffffff;
            --border: #e2e8f0;
            --radius: 14px;
            --radius-sm: 8px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.10);
            --transition: 0.25s ease;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container: 1200px;
            --nav-height: 70px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            color: var(--text);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
        }
        .header-inner {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text);
            text-decoration: none;
        }
        .site-logo i {
            font-size: 1.6rem;
            color: var(--primary);
        }
        .site-logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .site-logo:hover span {
            opacity: 0.85;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-weak);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .main-nav a.active {
            background: var(--primary);
            color: var(--text-inverse);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-toggle {
            background: none;
            border: none;
            font-size: 1.2rem;
            color: var(--text-weak);
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            transition: all var(--transition);
        }
        .search-toggle:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .btn-cta-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--accent);
            color: #1e293b;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
        }
        .btn-cta-nav i {
            font-size: 0.85rem;
        }
        .btn-cta-nav:hover {
            background: var(--accent-dark);
            color: #1e293b;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
        }

        /* ===== Article Banner ===== */
        .article-banner {
            margin-top: var(--nav-height);
            padding: 80px 0 60px;
            background: linear-gradient(135deg, #0f1f3d 0%, #1a3a6b 100%);
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            pointer-events: none;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            transition: color var(--transition);
        }
        .article-breadcrumb a:hover {
            color: var(--accent);
        }
        .article-breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.7rem;
        }
        .article-breadcrumb .current {
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
        }
        .article-title {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text-inverse);
            max-width: 900px;
            line-height: 1.25;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            color: rgba(255, 255, 255, 0.75);
            font-size: 0.95rem;
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            font-size: 0.85rem;
            color: var(--accent);
        }
        .article-meta .category-badge {
            background: var(--accent);
            color: #1e293b;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.8rem;
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 60px 0 80px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 40px;
            overflow: hidden;
        }
        .article-cover-img {
            border-radius: var(--radius-sm);
            margin-bottom: 32px;
            width: 100%;
            max-height: 420px;
            object-fit: cover;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
        }
        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-content h2,
        .article-content h3,
        .article-content h4 {
            margin-top: 32px;
            margin-bottom: 16px;
            font-weight: 700;
            color: var(--text);
        }
        .article-content h2 {
            font-size: 1.6rem;
            border-bottom: 2px solid var(--border);
            padding-bottom: 10px;
        }
        .article-content h3 {
            font-size: 1.3rem;
        }
        .article-content p {
            margin-bottom: 18px;
        }
        .article-content ul,
        .article-content ol {
            margin-bottom: 18px;
            padding-left: 24px;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content ul li {
            list-style: disc;
        }
        .article-content ol li {
            list-style: decimal;
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content a:hover {
            color: var(--primary-dark);
        }
        .article-content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-weak);
            font-style: italic;
        }
        .article-content code {
            background: #f1f5f9;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
        }
        .article-content pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 24px 0;
            font-size: 0.9rem;
        }
        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found i {
            font-size: 4rem;
            color: var(--text-weak);
            margin-bottom: 24px;
        }
        .article-not-found h2 {
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-weak);
            margin-bottom: 24px;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: var(--text-inverse);
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
        }
        .article-not-found .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(26, 95, 180, 0.3);
        }

        /* ===== Article Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px 24px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
        }
        .sidebar-card h3 i {
            color: var(--primary);
            font-size: 1rem;
        }
        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-tags a {
            background: var(--primary-light);
            color: var(--primary);
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .sidebar-tags a:hover {
            background: var(--primary);
            color: var(--text-inverse);
        }
        .sidebar-share {
            display: flex;
            gap: 12px;
            margin-top: 4px;
        }
        .sidebar-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 1.1rem;
            transition: all var(--transition);
        }
        .sidebar-share a:hover {
            background: var(--primary);
            color: var(--text-inverse);
            transform: translateY(-2px);
        }
        .sidebar-related-item {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-related-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }
        .sidebar-related-item img {
            width: 70px;
            height: 70px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .sidebar-related-item .info {
            flex: 1;
            min-width: 0;
        }
        .sidebar-related-item .info a {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color var(--transition);
        }
        .sidebar-related-item .info a:hover {
            color: var(--primary);
        }
        .sidebar-related-item .info .date {
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-top: 4px;
        }
        .sidebar-cta-card {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: var(--text-inverse);
            padding: 28px 24px;
            border-radius: var(--radius);
            text-align: center;
        }
        .sidebar-cta-card h3 {
            color: var(--text-inverse);
            margin-bottom: 12px;
            font-size: 1.15rem;
        }
        .sidebar-cta-card p {
            font-size: 0.9rem;
            opacity: 0.85;
            margin-bottom: 20px;
        }
        .sidebar-cta-card .btn-cta-side {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #1e293b;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
        }
        .sidebar-cta-card .btn-cta-side:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(245, 158, 11, 0.3);
        }

        /* ===== Related Articles Section ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 40px;
        }
        .related-section .section-title span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .related-card .card-img {
            height: 200px;
            overflow: hidden;
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .related-card:hover .card-img img {
            transform: scale(1.06);
        }
        .related-card .card-body {
            padding: 22px 24px 24px;
        }
        .related-card .card-body .cat {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }
        .related-card .card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .related-card .card-body h3 a {
            color: var(--text);
            transition: color var(--transition);
        }
        .related-card .card-body h3 a:hover {
            color: var(--primary);
        }
        .related-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-weak);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body .date {
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-top: 12px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .related-card .card-body .date i {
            font-size: 0.75rem;
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .faq-section .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 40px;
        }
        .faq-section .section-title span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            user-select: none;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-question i {
            color: var(--primary);
            transition: transform 0.3s ease;
            font-size: 0.85rem;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            text-align: center;
            color: var(--text-inverse);
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-inverse);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 640px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-cta-main {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: #1e293b;
            padding: 16px 44px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1.05rem;
            transition: all var(--transition);
        }
        .cta-section .btn-cta-main:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0, 0, 0, 0.2);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f1a2e;
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 32px;
        }
        .site-footer .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .site-logo {
            color: var(--text-inverse);
            margin-bottom: 14px;
        }
        .footer-brand .site-logo i {
            color: var(--accent);
        }
        .footer-brand .site-logo span {
            background: none;
            -webkit-text-fill-color: var(--text-inverse);
            background-clip: unset;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-col h4 {
            color: var(--text-inverse);
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 18px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color var(--transition);
        }
        .footer-col ul li a i {
            font-size: 0.65rem;
            color: var(--accent);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-social {
            display: flex;
            gap: 14px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #1e293b;
            transform: translateY(-2px);
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border);
            padding: 6px 0 env(safe-area-inset-bottom, 6px);
            justify-content: space-around;
            align-items: center;
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.04);
        }
        .mobile-bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 4px 12px;
            font-size: 0.7rem;
            color: var(--text-weak);
            text-decoration: none;
            transition: color var(--transition);
            min-width: 60px;
        }
        .mobile-bottom-tab a i {
            font-size: 1.2rem;
            margin-bottom: 2px;
        }
        .mobile-bottom-tab a.active {
            color: var(--primary);
        }
        .mobile-bottom-tab a:hover {
            color: var(--primary);
        }
        .mobile-bottom-tab .tab-search-btn {
            background: none;
            border: none;
            display: flex;
            flex-direction: column;
            align-items: center;
            cursor: pointer;
            font-size: 0.7rem;
            color: var(--text-weak);
            padding: 4px 12px;
            transition: color var(--transition);
        }
        .mobile-bottom-tab .tab-search-btn i {
            font-size: 1.2rem;
            margin-bottom: 2px;
        }
        .mobile-bottom-tab .tab-search-btn:hover {
            color: var(--primary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-title {
                font-size: 2.2rem;
            }
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .header-actions .btn-cta-nav {
                display: none;
            }
            .mobile-bottom-tab {
                display: flex;
            }
            .site-header {
                --nav-height: 60px;
            }
            .article-banner {
                padding: 60px 0 40px;
                min-height: 240px;
            }
            .article-title {
                font-size: 1.6rem;
            }
            .article-meta {
                font-size: 0.85rem;
                gap: 12px;
            }
            .article-main {
                padding: 40px 0 60px;
            }
            .article-body {
                padding: 24px 20px;
            }
            .article-content {
                font-size: 0.98rem;
            }
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .related-section .section-title {
                font-size: 1.5rem;
            }
            .faq-section .section-title {
                font-size: 1.5rem;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .article-breadcrumb {
                font-size: 0.8rem;
            }
            .article-cover-img {
                max-height: 240px;
            }
            body {
                padding-bottom: 64px;
            }
        }

        @media (max-width: 520px) {
            .article-title {
                font-size: 1.35rem;
            }
            .article-banner {
                padding: 50px 0 32px;
                min-height: 200px;
            }
            .article-body {
                padding: 18px 16px;
            }
            .article-content {
                font-size: 0.95rem;
            }
            .sidebar-card {
                padding: 20px 16px;
            }
            .related-card .card-body {
                padding: 16px 18px 20px;
            }
            .cta-section {
                padding: 50px 20px;
            }
            .cta-section h2 {
                font-size: 1.35rem;
            }
            .site-footer {
                padding: 40px 0 80px;
            }
            .footer-grid {
                gap: 20px;
            }
            .article-meta {
                flex-direction: column;
                gap: 8px;
            }
            .btn-cta-nav {
                font-size: 0.85rem;
                padding: 8px 16px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .d-flex {
            display: flex;
        }
        .align-center {
            align-items: center;
        }