/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1e3a5f;
            --primary-light: #2a4f7a;
            --primary-dark: #0f2440;
            --accent: #3b82f6;
            --accent-hover: #2563eb;
            --accent-light: #dbeafe;
            --highlight: #f59e0b;
            --highlight-hover: #d97706;
            --bg: #f8fafc;
            --bg-alt: #f1f5f9;
            --bg-dark: #0f172a;
            --card-bg: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-lighter: #94a3b8;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 32px rgba(0,0,0,0.10);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg);
        }
        a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-hover); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.8rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.4rem; }
        h4 { font-size: 1.15rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 12px 28px; border-radius: var(--radius-sm);
            font-weight: 600; font-size: 0.95rem; line-height: 1.2;
            border: 2px solid transparent; cursor: pointer;
            transition: all var(--transition); text-align: center;
            white-space: nowrap; background: none; color: var(--text);
        }
        .btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
        .btn-primary {
            background: var(--accent); color: #fff; border-color: var(--accent);
        }
        .btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(59,130,246,0.35); }
        .btn-outline {
            background: transparent; color: var(--text); border-color: var(--border);
        }
        .btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); transform: translateY(-2px); }
        .btn-highlight {
            background: var(--highlight); color: #fff; border-color: var(--highlight);
        }
        .btn-highlight:hover { background: var(--highlight-hover); border-color: var(--highlight-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.35); }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; border-radius: var(--radius); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }

        /* ===== Tags & Badges ===== */
        .tag {
            display: inline-block; padding: 4px 14px; border-radius: 50px;
            font-size: 0.8rem; font-weight: 500; background: var(--accent-light);
            color: var(--accent); border: 1px solid rgba(59,130,246,0.15);
        }
        .badge {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 6px 16px; border-radius: 50px; font-size: 0.8rem; font-weight: 600;
            background: var(--highlight); color: #fff;
        }

        /* ===== Header & Navigation ===== */
        header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            background: rgba(255,255,255,0.92); backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border); height: var(--nav-height);
            transition: box-shadow var(--transition);
        }
        header.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
        .nav-container {
            max-width: var(--container); margin: 0 auto; padding: 0 24px;
            display: flex; align-items: center; justify-content: space-between;
            height: 100%;
        }
        .nav-logo {
            display: flex; align-items: center; gap: 10px; font-size: 1.25rem;
            font-weight: 800; color: var(--primary); text-decoration: none;
            letter-spacing: -0.5px;
        }
        .nav-logo:hover { color: var(--primary); }
        .nav-logo i { font-size: 1.6rem; color: var(--accent); }
        .nav-links { display: flex; align-items: center; gap: 8px; }
        .nav-links a {
            padding: 8px 20px; border-radius: var(--radius-sm);
            font-size: 0.9rem; font-weight: 500; color: var(--text-light);
            transition: all var(--transition); text-decoration: none;
        }
        .nav-links a:hover { color: var(--text); background: var(--bg-alt); }
        .nav-links a.active { color: var(--accent); background: var(--accent-light); font-weight: 600; }
        .nav-actions { display: flex; align-items: center; gap: 12px; }
        .nav-search {
            display: flex; align-items: center; background: var(--bg-alt);
            border-radius: 50px; padding: 0 16px; border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .nav-search:focus-within { border-color: var(--accent); background: #fff; box-shadow: 0 0 0 4px rgba(59,130,246,0.1); }
        .nav-search input {
            border: none; background: transparent; padding: 8px 8px 8px 4px;
            font-size: 0.85rem; outline: none; width: 140px; color: var(--text);
        }
        .nav-search input::placeholder { color: var(--text-lighter); }
        .nav-search i { color: var(--text-lighter); font-size: 0.9rem; }
        .nav-actions .btn { padding: 8px 20px; font-size: 0.85rem; }
        .nav-toggle { display: none; font-size: 1.5rem; color: var(--text); cursor: pointer; background: none; border: none; padding: 8px; }

        /* Mobile Nav */
        .mobile-menu {
            display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
            background: rgba(255,255,255,0.98); backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border); padding: 16px 24px 24px;
            box-shadow: var(--shadow-md); z-index: 999;
        }
        .mobile-menu.open { display: block; }
        .mobile-menu a {
            display: block; padding: 12px 16px; border-radius: var(--radius-sm);
            font-size: 1rem; font-weight: 500; color: var(--text-light);
            text-decoration: none; transition: all var(--transition);
        }
        .mobile-menu a:hover { background: var(--bg-alt); color: var(--text); }
        .mobile-menu a.active { color: var(--accent); background: var(--accent-light); }
        .mobile-menu .mobile-actions { display: flex; gap: 12px; margin-top: 16px; }
        .mobile-menu .mobile-actions .btn { flex: 1; justify-content: center; }

        /* ===== Hero ===== */
        .hero {
            padding: 140px 0 100px; margin-top: var(--nav-height);
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            position: relative; overflow: hidden; min-height: 600px;
            display: flex; align-items: center;
        }
        .hero::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15; mix-blend-mode: overlay;
        }
        .hero::after {
            content: ''; position: absolute; bottom: 0; left: 0; right: 0;
            height: 120px; background: linear-gradient(to top, var(--bg), transparent);
        }
        .hero-content { position: relative; z-index: 2; max-width: 820px; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            background: rgba(255,255,255,0.12); backdrop-filter: blur(8px);
            padding: 8px 20px; border-radius: 50px; font-size: 0.85rem;
            color: var(--text-white); margin-bottom: 24px; border: 1px solid rgba(255,255,255,0.15);
        }
        .hero-badge i { color: var(--highlight); }
        .hero h1 { font-size: 3.6rem; font-weight: 800; color: #fff; line-height: 1.15; margin-bottom: 20px; letter-spacing: -1px; }
        .hero h1 span { color: var(--highlight); }
        .hero p {
            font-size: 1.2rem; color: rgba(241,245,249,0.85);
            max-width: 640px; margin-bottom: 36px; line-height: 1.7;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-actions .btn-primary { background: #fff; color: var(--primary); border-color: #fff; }
        .hero-actions .btn-primary:hover { background: var(--highlight); color: #fff; border-color: var(--highlight); transform: translateY(-3px); box-shadow: 0 12px 32px rgba(245,158,11,0.3); }
        .hero-actions .btn-outline { color: #fff; border-color: rgba(255,255,255,0.4); }
        .hero-actions .btn-outline:hover { border-color: #fff; color: #fff; background: rgba(255,255,255,0.1); }
        .hero-stats {
            display: flex; gap: 40px; margin-top: 48px;
            padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.12);
        }
        .hero-stat { text-align: left; }
        .hero-stat .num { font-size: 2rem; font-weight: 800; color: #fff; }
        .hero-stat .label { font-size: 0.85rem; color: rgba(241,245,249,0.7); margin-top: 4px; }

        /* ===== Section ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--bg-alt); }
        .section-dark { background: var(--bg-dark); color: var(--text-white); }
        .section-title { text-align: center; margin-bottom: 56px; }
        .section-title h2 { font-size: 2.2rem; margin-bottom: 12px; }
        .section-title h2 span { color: var(--accent); }
        .section-title p { max-width: 600px; margin: 0 auto; font-size: 1.05rem; }
        .section-title .tag { margin-bottom: 12px; }

        /* ===== Cards ===== */
        .card {
            background: var(--card-bg); border-radius: var(--radius);
            border: 1px solid var(--border); padding: 32px;
            transition: all var(--transition); box-shadow: var(--shadow);
        }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(59,130,246,0.15); }
        .card-icon { width: 56px; height: 56px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: #fff; margin-bottom: 20px; background: var(--accent); }
        .card h3 { margin-bottom: 10px; }
        .card p { font-size: 0.95rem; margin-bottom: 0; }
        .card .tag { margin-top: 16px; }

        /* ===== Grids ===== */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

        /* ===== Feature / Image + Text ===== */
        .feature-block { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
        .feature-block .image-wrap {
            border-radius: var(--radius-lg); overflow: hidden;
            box-shadow: var(--shadow-md); background: var(--bg-alt);
        }
        .feature-block .image-wrap img { width: 100%; height: 400px; object-fit: cover; transition: transform 0.6s ease; }
        .feature-block .image-wrap:hover img { transform: scale(1.03); }
        .feature-block .text-wrap h2 { margin-bottom: 16px; }
        .feature-block .text-wrap p { font-size: 1.05rem; margin-bottom: 20px; }
        .feature-list { display: flex; flex-direction: column; gap: 16px; margin-top: 24px; }
        .feature-list li { display: flex; align-items: flex-start; gap: 12px; font-size: 0.95rem; color: var(--text-light); }
        .feature-list li i { color: var(--accent); font-size: 1.1rem; margin-top: 2px; flex-shrink: 0; }

        /* ===== Content / News List ===== */
        .content-list { display: grid; gap: 20px; }
        .content-item {
            display: flex; gap: 20px; padding: 24px; background: var(--card-bg);
            border-radius: var(--radius); border: 1px solid var(--border);
            transition: all var(--transition); cursor: default;
        }
        .content-item:hover { border-color: rgba(59,130,246,0.2); box-shadow: var(--shadow); transform: translateY(-2px); }
        .content-item .item-thumb {
            width: 160px; height: 110px; border-radius: var(--radius-sm);
            background: var(--bg-alt); flex-shrink: 0; overflow: hidden;
        }
        .content-item .item-thumb img { width: 100%; height: 100%; object-fit: cover; }
        .content-item .item-body { flex: 1; }
        .content-item .item-body h3 { font-size: 1.1rem; margin-bottom: 6px; font-weight: 600; }
        .content-item .item-body h3 a { color: var(--text); text-decoration: none; }
        .content-item .item-body h3 a:hover { color: var(--accent); }
        .content-item .item-body p { font-size: 0.9rem; margin-bottom: 8px; color: var(--text-lighter); }
        .content-item .item-meta { display: flex; align-items: center; gap: 16px; font-size: 0.8rem; color: var(--text-lighter); }
        .content-item .item-meta .tag { font-size: 0.7rem; padding: 2px 10px; }

        /* ===== Data / Stats ===== */
        .data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .data-card {
            text-align: center; padding: 32px 20px; background: var(--card-bg);
            border-radius: var(--radius); border: 1px solid var(--border);
            box-shadow: var(--shadow); transition: all var(--transition);
        }
        .data-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .data-card .num { font-size: 2.6rem; font-weight: 800; color: var(--accent); line-height: 1.2; }
        .data-card .num span { color: var(--highlight); }
        .data-card .label { font-size: 0.9rem; color: var(--text-light); margin-top: 8px; }

        /* ===== Steps / Process ===== */
        .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; counter-reset: step; }
        .step-card {
            counter-increment: step; text-align: center; padding: 36px 24px;
            background: var(--card-bg); border-radius: var(--radius);
            border: 1px solid var(--border); position: relative;
            transition: all var(--transition);
        }
        .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .step-card::before {
            content: counter(step); position: absolute; top: -16px; left: 50%;
            transform: translateX(-50%); width: 36px; height: 36px;
            border-radius: 50%; background: var(--accent); color: #fff;
            display: flex; align-items: center; justify-content: center;
            font-weight: 700; font-size: 1rem; box-shadow: 0 4px 12px rgba(59,130,246,0.3);
        }
        .step-card .step-icon { font-size: 2.4rem; color: var(--accent); margin-bottom: 16px; margin-top: 8px; }
        .step-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--card-bg); border-radius: var(--radius-sm);
            border: 1px solid var(--border); overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: rgba(59,130,246,0.15); }
        .faq-question {
            padding: 20px 24px; display: flex; align-items: center; justify-content: space-between;
            cursor: pointer; font-weight: 600; font-size: 1rem; color: var(--text);
            background: none; border: none; width: 100%; text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--bg-alt); }
        .faq-question i { color: var(--text-lighter); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--accent); }
        .faq-answer { padding: 0 24px 20px; font-size: 0.95rem; color: var(--text-light); display: none; line-height: 1.7; }
        .faq-item.open .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0; background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.1; mix-blend-mode: overlay;
        }
        .cta-content { position: relative; z-index: 2; text-align: center; max-width: 640px; margin: 0 auto; }
        .cta-content h2 { font-size: 2.4rem; color: #fff; margin-bottom: 16px; }
        .cta-content p { color: rgba(241,245,249,0.8); font-size: 1.1rem; margin-bottom: 32px; }
        .cta-content .btn-highlight { font-size: 1.1rem; padding: 16px 48px; }
        .cta-content .btn-highlight:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(245,158,11,0.3); }

        /* ===== Footer ===== */
        footer {
            background: var(--bg-dark); color: var(--text-white); padding: 60px 0 30px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .nav-logo { color: #fff; margin-bottom: 16px; }
        .footer-brand .nav-logo i { color: var(--accent); }
        .footer-brand p { font-size: 0.9rem; color: rgba(241,245,249,0.6); max-width: 280px; }
        .footer-col h4 { font-size: 0.95rem; color: #fff; margin-bottom: 16px; font-weight: 600; }
        .footer-col a {
            display: block; font-size: 0.88rem; color: rgba(241,245,249,0.6);
            padding: 6px 0; text-decoration: none; transition: color var(--transition);
        }
        .footer-col 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;
        }
        .footer-bottom p { font-size: 0.82rem; color: rgba(241,245,249,0.4); margin-bottom: 0; }
        .footer-bottom a { color: rgba(241,245,249,0.5); font-size: 0.82rem; text-decoration: none; }
        .footer-bottom a:hover { color: var(--accent); }
        .footer-social { display: flex; gap: 16px; }
        .footer-social a { color: rgba(241,245,249,0.5); font-size: 1.1rem; transition: color var(--transition); }
        .footer-social a:hover { color: var(--accent); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero h1 { font-size: 2.8rem; }
            .grid-3, .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .data-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .feature-block { gap: 40px; }
        }

        @media (max-width: 768px) {
            .nav-links, .nav-actions .btn-outline, .nav-search { display: none; }
            .nav-toggle { display: block; }
            .hero { padding: 110px 0 70px; min-height: auto; }
            .hero h1 { font-size: 2.2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stat .num { font-size: 1.6rem; }
            .section { padding: 56px 0; }
            .section-title h2 { font-size: 1.7rem; }
            .grid-3, .grid-2, .steps-grid { grid-template-columns: 1fr; gap: 20px; }
            .data-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .feature-block { grid-template-columns: 1fr; gap: 32px; }
            .feature-block .image-wrap img { height: 260px; }
            .content-item { flex-direction: column; }
            .content-item .item-thumb { width: 100%; height: 180px; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-content h2 { font-size: 1.8rem; }
            .data-card .num { font-size: 2rem; }
            .hero-actions .btn { width: 100%; justify-content: center; }
        }

        @media (max-width: 520px) {
            .hero h1 { font-size: 1.7rem; }
            .hero p { font-size: 0.92rem; }
            .hero-stats { flex-direction: column; gap: 16px; }
            .data-grid { grid-template-columns: 1fr; }
            .nav-logo { font-size: 1.05rem; }
            .nav-logo i { font-size: 1.3rem; }
        }

        /* ===== Misc Utilities ===== */
        .text-center { text-align: center; }
        .mt-24 { margin-top: 24px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .rounded-full { border-radius: 50%; }
        .bg-accent-light { background: var(--accent-light); }
        .text-accent { color: var(--accent); }
        .text-highlight { color: var(--highlight); }

/* roulang page: article */
/* ===== Design Variables ===== */
    :root {
        --primary: #2563eb;
        --primary-light: #3b82f6;
        --primary-dark: #1d4ed8;
        --primary-bg: #eff6ff;
        --secondary: #0f172a;
        --secondary-light: #1e293b;
        --accent: #f59e0b;
        --accent-light: #fbbf24;
        --success: #10b981;
        --surface: #ffffff;
        --bg: #f8fafc;
        --bg-alt: #f1f5f9;
        --text: #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-lg: 0 12px 48px rgba(0, 0, 0, 0.10);
        --shadow-hover: 0 16px 48px rgba(37, 99, 235, 0.12);
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        --max-width: 1200px;
        --header-h: 72px;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font);
        font-size: 16px;
        line-height: 1.7;
        color: var(--text);
        background: var(--bg);
    }
    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; border-radius: var(--radius-sm); }
    button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--secondary); }
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.05rem; }
    p { margin-bottom: 1rem; color: var(--text-secondary); }
    p:last-child { margin-bottom: 0; }
    .container {
        width: 100%;
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }

    /* ===== Header & Nav ===== */
    header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: var(--header-h);
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        z-index: 1000;
        transition: box-shadow var(--transition);
    }
    header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.06); }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-h);
        gap: 16px;
    }
    .nav-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--secondary);
        white-space: nowrap;
    }
    .nav-logo i { color: var(--primary); font-size: 1.4rem; }
    .nav-logo:hover { color: var(--primary); }
    .nav-links {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    .nav-links a {
        display: block;
        padding: 8px 18px;
        border-radius: var(--radius-xs);
        font-size: 0.92rem;
        font-weight: 500;
        color: var(--text-secondary);
        transition: all var(--transition);
        position: relative;
    }
    .nav-links a:hover { color: var(--primary); background: var(--primary-bg); }
    .nav-links a.active {
        color: var(--primary);
        background: var(--primary-bg);
        font-weight: 600;
    }
    .nav-links a.active::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 3px;
        background: var(--primary);
        border-radius: 4px;
    }
    .nav-actions {
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .nav-search {
        display: flex;
        align-items: center;
        background: var(--bg-alt);
        border-radius: 40px;
        padding: 0 16px;
        border: 1px solid transparent;
        transition: all var(--transition);
    }
    .nav-search:focus-within {
        border-color: var(--primary);
        background: var(--surface);
        box-shadow: 0 0 0 4px rgba(37,99,235,0.08);
    }
    .nav-search input {
        background: transparent;
        padding: 8px 10px;
        font-size: 0.88rem;
        color: var(--text);
        width: 140px;
    }
    .nav-search input::placeholder { color: var(--text-muted); }
    .nav-search button {
        background: transparent;
        color: var(--text-muted);
        cursor: pointer;
        padding: 4px;
        font-size: 0.95rem;
        transition: color var(--transition);
    }
    .nav-search button:hover { color: var(--primary); }
    .nav-btn {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 10px 22px;
        border-radius: 40px;
        font-weight: 600;
        font-size: 0.9rem;
        cursor: pointer;
        transition: all var(--transition);
        background: var(--primary);
        color: #fff;
        border: none;
    }
    .nav-btn:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(37,99,235,0.3); }
    .nav-btn i { font-size: 0.85rem; }
    .nav-toggle { display: none; background: transparent; font-size: 1.5rem; color: var(--secondary); cursor: pointer; padding: 4px; }

    /* ===== Hero Banner (inner) ===== */
    .page-banner {
        margin-top: var(--header-h);
        padding: 80px 0 60px;
        background: linear-gradient(135deg, var(--primary-bg) 0%, #dbeafe 100%);
        position: relative;
        overflow: hidden;
    }
    .page-banner::before {
        content: '';
        position: absolute;
        inset: 0;
        background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
        opacity: 0.06;
        pointer-events: none;
    }
    .page-banner .container { position: relative; z-index: 1; }
    .page-banner h1 {
        font-size: 2rem;
        max-width: 800px;
        line-height: 1.4;
        margin-bottom: 12px;
    }
    .page-banner .meta {
        display: flex;
        flex-wrap: wrap;
        gap: 16px 24px;
        color: var(--text-secondary);
        font-size: 0.92rem;
        align-items: center;
    }
    .page-banner .meta i { margin-right: 6px; color: var(--primary); }
    .page-banner .meta .tag {
        display: inline-block;
        padding: 4px 14px;
        border-radius: 40px;
        background: var(--primary);
        color: #fff;
        font-size: 0.8rem;
        font-weight: 500;
    }
    .breadcrumb {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
        margin-bottom: 20px;
        font-size: 0.88rem;
        color: var(--text-muted);
    }
    .breadcrumb a { color: var(--text-muted); }
    .breadcrumb a:hover { color: var(--primary); }
    .breadcrumb span { color: var(--text-secondary); }

    /* ===== Article Main ===== */
    .article-section {
        padding: 60px 0 80px;
    }
    .article-layout {
        display: grid;
        grid-template-columns: 1fr 320px;
        gap: 48px;
        align-items: start;
    }
    .article-body {
        background: var(--surface);
        border-radius: var(--radius);
        padding: 40px 44px;
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
    }
    .article-body .content {
        font-size: 1.02rem;
        line-height: 1.85;
        color: var(--text-secondary);
    }
    .article-body .content h2,
    .article-body .content h3 {
        margin-top: 32px;
        margin-bottom: 16px;
        color: var(--secondary);
    }
    .article-body .content p {
        margin-bottom: 18px;
    }
    .article-body .content img {
        margin: 24px 0;
        border-radius: var(--radius-sm);
        box-shadow: var(--shadow);
    }
    .article-body .content ul,
    .article-body .content ol {
        margin-bottom: 18px;
        padding-left: 24px;
        list-style: disc;
    }
    .article-body .content li {
        margin-bottom: 8px;
        color: var(--text-secondary);
    }
    .article-body .content blockquote {
        border-left: 4px solid var(--primary);
        background: var(--primary-bg);
        padding: 16px 24px;
        margin: 24px 0;
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--text-secondary);
    }
    .article-body .content a { text-decoration: underline; }
    .article-footer {
        margin-top: 40px;
        padding-top: 24px;
        border-top: 1px solid var(--border);
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        gap: 16px;
    }
    .article-footer .share {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 0.9rem;
        color: var(--text-secondary);
    }
    .article-footer .share a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: var(--bg-alt);
        color: var(--text-secondary);
        transition: all var(--transition);
    }
    .article-footer .share a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
    .article-footer .cat-link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        color: var(--primary);
        font-weight: 500;
    }

    /* ===== Sidebar ===== */
    .article-sidebar {
        display: flex;
        flex-direction: column;
        gap: 32px;
    }
    .sidebar-card {
        background: var(--surface);
        border-radius: var(--radius);
        padding: 28px;
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
    }
    .sidebar-card h3 {
        font-size: 1.05rem;
        margin-bottom: 16px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .sidebar-card h3 i { color: var(--primary); }
    .sidebar-list {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    .sidebar-list a {
        display: flex;
        gap: 12px;
        padding: 12px;
        border-radius: var(--radius-xs);
        background: var(--bg);
        transition: all var(--transition);
        align-items: flex-start;
    }
    .sidebar-list a:hover {
        background: var(--primary-bg);
        transform: translateX(4px);
    }
    .sidebar-list a img {
        width: 64px;
        height: 48px;
        object-fit: cover;
        border-radius: 6px;
        flex-shrink: 0;
    }
    .sidebar-list a .info { flex: 1; min-width: 0; }
    .sidebar-list a .info h4 {
        font-size: 0.88rem;
        font-weight: 600;
        color: var(--secondary);
        margin-bottom: 2px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .sidebar-list a .info .date {
        font-size: 0.78rem;
        color: var(--text-muted);
    }
    .sidebar-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .sidebar-tags a {
        display: inline-block;
        padding: 6px 14px;
        border-radius: 40px;
        background: var(--bg-alt);
        color: var(--text-secondary);
        font-size: 0.82rem;
        transition: all var(--transition);
    }
    .sidebar-tags a:hover { background: var(--primary); color: #fff; }

    /* ===== Related Posts ===== */
    .related-section {
        padding: 0 0 60px;
    }
    .related-section h2 {
        margin-bottom: 28px;
        font-size: 1.5rem;
    }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .related-card {
        background: var(--surface);
        border-radius: var(--radius);
        overflow: hidden;
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
        transition: all var(--transition);
    }
    .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .related-card img {
        width: 100%;
        height: 180px;
        object-fit: cover;
        border-radius: 0;
    }
    .related-card .body {
        padding: 20px;
    }
    .related-card .body h4 {
        font-size: 1rem;
        margin-bottom: 8px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .related-card .body p {
        font-size: 0.88rem;
        color: var(--text-muted);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .related-card .body .meta-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 12px;
        font-size: 0.82rem;
        color: var(--text-muted);
    }

    /* ===== Not Found ===== */
    .not-found-box {
        text-align: center;
        padding: 80px 40px;
        background: var(--surface);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
    }
    .not-found-box i { font-size: 4rem; color: var(--text-muted); margin-bottom: 20px; }
    .not-found-box h2 { font-size: 1.5rem; margin-bottom: 12px; }
    .not-found-box p { color: var(--text-secondary); margin-bottom: 24px; }
    .not-found-box .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 12px 32px;
        border-radius: 40px;
        background: var(--primary);
        color: #fff;
        font-weight: 600;
        transition: all var(--transition);
    }
    .not-found-box .btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.3); }

    /* ===== Footer ===== */
    footer {
        background: var(--secondary);
        color: #cbd5e1;
        padding: 60px 0 0;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        padding-bottom: 40px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .footer-brand .nav-logo { color: #fff; margin-bottom: 16px; }
    .footer-brand .nav-logo i { color: var(--primary-light); }
    .footer-brand p { font-size: 0.92rem; color: #94a3b8; line-height: 1.7; max-width: 360px; }
    .footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; font-weight: 600; }
    .footer-col a {
        display: block;
        padding: 4px 0;
        color: #94a3b8;
        font-size: 0.9rem;
        transition: all var(--transition);
    }
    .footer-col a:hover { color: #fff; padding-left: 4px; }
    .footer-bottom {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        padding: 24px 0;
        gap: 16px;
        font-size: 0.85rem;
        color: #64748b;
    }
    .footer-social { display: flex; gap: 12px; }
    .footer-social a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 38px;
        height: 38px;
        border-radius: 50%;
        background: rgba(255,255,255,0.06);
        color: #94a3b8;
        transition: all var(--transition);
    }
    .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .article-layout { grid-template-columns: 1fr; }
        .related-grid { grid-template-columns: repeat(2, 1fr); }
        .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
        .nav-links { display: none; }
        .nav-links.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; width: 100%; background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px 24px; box-shadow: var(--shadow-lg); gap: 2px; }
        .nav-links.open a { padding: 12px 16px; border-radius: var(--radius-xs); }
        .nav-links.open a.active::after { display: none; }
        .nav-toggle { display: block; }
        .nav-search input { width: 100px; }
        .nav-btn span { display: none; }
        .nav-btn { padding: 10px 16px; }
        .page-banner { padding: 60px 0 40px; }
        .page-banner h1 { font-size: 1.5rem; }
        .article-body { padding: 24px 20px; }
        .article-body .content { font-size: 0.96rem; }
        .related-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr; gap: 32px; }
        .footer-bottom { flex-direction: column; text-align: center; }
        h1 { font-size: 1.75rem; }
        h2 { font-size: 1.4rem; }
    }
    @media (max-width: 520px) {
        .container { padding: 0 16px; }
        .header-inner { gap: 8px; }
        .nav-search { display: none; }
        .nav-logo { font-size: 1.05rem; }
        .page-banner h1 { font-size: 1.25rem; }
        .article-body { padding: 16px; }
        .sidebar-card { padding: 20px; }
    }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2a6df4;
            --primary-dark: #1a4fc3;
            --primary-light: #e8f0fe;
            --primary-gradient: linear-gradient(135deg, #2a6df4 0%, #6c5ce7 100%);
            --accent: #f59e0b;
            --accent-light: #fef3c7;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.16);
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 2rem;
            --spacing-xl: 4rem;
            --spacing-2xl: 6rem;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 0.8rem;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 var(--spacing-md);
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
        }
        @media (max-width: 520px) {
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            .container {
                padding: 0 var(--spacing-sm);
            }
        }

        /* ===== Header & Navigation ===== */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            padding: 0 var(--spacing-lg);
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .nav-logo i {
            font-size: 1.6rem;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-logo:hover {
            color: var(--primary);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2px;
        }
        .nav-links a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--bg-section-alt);
            border-radius: 50px;
            padding: 0 14px;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .nav-search:focus-within {
            border-color: var(--primary);
            background: var(--bg-white);
            box-shadow: 0 0 0 3px rgba(42, 109, 244, 0.15);
        }
        .nav-search input {
            background: transparent;
            padding: 8px 10px;
            font-size: 0.9rem;
            color: var(--text-primary);
            width: 160px;
            border: none;
        }
        .nav-search input::placeholder {
            color: var(--text-muted);
        }
        .nav-search button {
            background: transparent;
            color: var(--text-muted);
            cursor: pointer;
            padding: 4px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .nav-search button:hover {
            color: var(--primary);
        }
        .nav-btn {
            padding: 8px 22px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            background: var(--primary-gradient);
            color: var(--text-light);
            transition: var(--transition);
            cursor: pointer;
            white-space: nowrap;
            border: none;
        }
        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(42, 109, 244, 0.35);
            color: var(--text-light);
        }
        .nav-btn-outline {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
            padding: 7px 20px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            cursor: pointer;
            white-space: nowrap;
        }
        .nav-btn-outline:hover {
            background: var(--primary);
            color: var(--text-light);
            transform: translateY(-1px);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 4px;
        }
        @media (max-width: 900px) {
            .nav-links {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: var(--spacing-md) var(--spacing-lg);
                gap: 6px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                z-index: 99;
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav-links a {
                padding: 12px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .nav-links a.active::after {
                display: none;
            }
            .menu-toggle {
                display: block;
            }
            .nav-search input {
                width: 100px;
            }
            .nav-btn {
                padding: 6px 16px;
                font-size: 0.8rem;
            }
            .nav-btn-outline {
                padding: 5px 14px;
                font-size: 0.8rem;
            }
            .nav-right {
                gap: 8px;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                padding: 0 var(--spacing-sm);
                height: 60px;
            }
            .nav-logo {
                font-size: 1.1rem;
            }
            .nav-logo i {
                font-size: 1.3rem;
            }
            .nav-search {
                display: none;
            }
            .nav-btn-outline {
                display: none;
            }
            .nav-btn {
                padding: 5px 12px;
                font-size: 0.75rem;
            }
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 60%, #0f172a 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18;
            z-index: 0;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(42, 109, 244, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 30%, rgba(108, 92, 231, 0.12) 0%, transparent 50%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: var(--spacing-md);
        }
        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--text-light);
        }
        .page-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.9);
        }
        .page-banner .breadcrumb i {
            font-size: 0.6rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .page-banner h1 {
            color: var(--text-light);
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: var(--spacing-sm);
            max-width: 700px;
        }
        .page-banner p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 600px;
            line-height: 1.7;
        }
        .page-banner .banner-meta {
            display: flex;
            gap: 20px;
            margin-top: var(--spacing-md);
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
        }
        .page-banner .banner-meta i {
            margin-right: 6px;
        }
        @media (max-width: 768px) {
            .page-banner {
                min-height: 240px;
                padding: var(--spacing-lg) 0;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .page-banner .banner-meta {
                flex-wrap: wrap;
                gap: 12px;
            }
        }
        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner .breadcrumb {
                font-size: 0.75rem;
            }
        }

        /* ===== Section通用 ===== */
        section {
            padding: var(--spacing-xl) 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-title {
            text-align: center;
            margin-bottom: var(--spacing-xl);
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.3px;
            margin-bottom: var(--spacing-sm);
        }
        .section-title p {
            max-width: 580px;
            margin: 0 auto;
            color: var(--text-secondary);
            font-size: 1.05rem;
        }
        .section-title .badge {
            display: inline-block;
            padding: 4px 16px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.3px;
        }
        @media (max-width: 768px) {
            section {
                padding: var(--spacing-lg) 0;
            }
            .section-title h2 {
                font-size: 1.5rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
            .section-title {
                margin-bottom: var(--spacing-lg);
            }
        }
        @media (max-width: 520px) {
            section {
                padding: var(--spacing-lg) 0;
            }
        }

        /* ===== 分类介绍 ===== */
        .intro-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-xl);
            align-items: center;
        }
        .intro-block .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-block .intro-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 320px;
        }
        .intro-block .intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(42, 109, 244, 0.08) 0%, transparent 60%);
            border-radius: var(--radius-lg);
        }
        .intro-block .intro-text h3 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: var(--spacing-md);
            letter-spacing: -0.3px;
        }
        .intro-block .intro-text p {
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: var(--spacing-md);
        }
        .intro-block .intro-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: var(--spacing-md);
        }
        .intro-block .intro-tags span {
            padding: 6px 16px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid rgba(42, 109, 244, 0.12);
        }
        @media (max-width: 900px) {
            .intro-block {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }
            .intro-block .intro-image {
                order: -1;
            }
            .intro-block .intro-image img {
                min-height: 220px;
            }
            .intro-block .intro-text h3 {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 520px) {
            .intro-block .intro-text h3 {
                font-size: 1.2rem;
            }
            .intro-block .intro-text p {
                font-size: 0.95rem;
            }
        }

        /* ===== 步骤流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            position: relative;
            counter-increment: step;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }
        .step-card .step-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--primary);
            opacity: 0.12;
            position: absolute;
            top: 16px;
            right: 20px;
            line-height: 1;
            font-family: 'Inter', sans-serif;
        }
        .step-card .step-icon {
            width: 54px;
            height: 54px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: var(--spacing-md);
            transition: var(--transition);
        }
        .step-card:hover .step-icon {
            background: var(--primary);
            color: var(--text-light);
        }
        .step-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: var(--spacing-xs);
        }
        .step-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .step-card .step-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: var(--spacing-sm);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--primary);
        }
        .step-card .step-link i {
            font-size: 0.75rem;
            transition: var(--transition);
        }
        .step-card .step-link:hover i {
            transform: translateX(4px);
        }
        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .step-card {
                padding: var(--spacing-md);
            }
            .step-card .step-number {
                font-size: 2.2rem;
            }
        }

        /* ===== 功能卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }
        .feature-card .card-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .feature-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .feature-card:hover .card-img img {
            transform: scale(1.05);
        }
        .feature-card .card-img .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(6px);
            color: var(--text-light);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .feature-card .card-body {
            padding: var(--spacing-md) var(--spacing-md) var(--spacing-lg);
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .feature-card .card-body h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: var(--spacing-xs);
        }
        .feature-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            flex: 1;
            margin-bottom: var(--spacing-sm);
        }
        .feature-card .card-body .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: auto;
            padding-top: var(--spacing-sm);
            border-top: 1px solid var(--border-light);
        }
        .feature-card .card-body .card-meta i {
            margin-right: 4px;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .feature-card .card-img {
                height: 180px;
            }
        }

        /* ===== 场景卡片 ===== */
        .scenes-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--spacing-lg);
        }
        .scene-card {
            display: flex;
            gap: var(--spacing-md);
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            align-items: flex-start;
        }
        .scene-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--primary);
        }
        .scene-card .scene-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
        }
        .scene-card .scene-content h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .scene-card .scene-content p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .scene-card .scene-content .scene-tag {
            display: inline-block;
            padding: 2px 12px;
            background: var(--accent-light);
            color: #b45309;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-top: var(--spacing-xs);
        }
        @media (max-width: 768px) {
            .scenes-grid {
                grid-template-columns: 1fr;
            }
            .scene-card {
                padding: var(--spacing-md);
            }
        }
        @media (max-width: 520px) {
            .scene-card {
                flex-direction: column;
                align-items: flex-start;
                gap: var(--spacing-sm);
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
        }
        .faq-item summary {
            padding: var(--spacing-md) var(--spacing-lg);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-md);
            list-style: none;
            color: var(--text-primary);
            transition: var(--transition);
            user-select: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .faq-item[open] summary .faq-icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: var(--text-light);
        }
        .faq-item .faq-answer {
            padding: 0 var(--spacing-lg) var(--spacing-lg);
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item .faq-answer p:last-child {
            margin-bottom: 0;
        }
        @media (max-width: 520px) {
            .faq-item summary {
                padding: var(--spacing-sm) var(--spacing-md);
                font-size: 0.92rem;
            }
            .faq-item .faq-answer {
                padding: 0 var(--spacing-md) var(--spacing-md);
                font-size: 0.88rem;
            }
        }

        /* ===== CTA ===== */
        .cta-block {
            background: var(--primary-gradient);
            border-radius: var(--radius-lg);
            padding: var(--spacing-xl) var(--spacing-lg);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.6;
        }
        .cta-block * {
            position: relative;
            z-index: 1;
        }
        .cta-block h3 {
            color: var(--text-light);
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: var(--spacing-sm);
        }
        .cta-block p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.05rem;
            max-width: 500px;
            margin: 0 auto var(--spacing-lg);
        }
        .cta-block .cta-buttons {
            display: flex;
            justify-content: center;
            gap: var(--spacing-md);
            flex-wrap: wrap;
        }
        .cta-block .cta-btn-primary {
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            background: var(--text-light);
            color: var(--primary);
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .cta-block .cta-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
            color: var(--primary-dark);
        }
        .cta-block .cta-btn-outline {
            padding: 13px 34px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            background: transparent;
            color: var(--text-light);
            border: 2px solid rgba(255, 255, 255, 0.5);
            cursor: pointer;
            transition: var(--transition);
        }
        .cta-block .cta-btn-outline:hover {
            border-color: var(--text-light);
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .cta-block {
                padding: var(--spacing-lg) var(--spacing-md);
            }
            .cta-block h3 {
                font-size: 1.4rem;
            }
            .cta-block p {
                font-size: 0.95rem;
            }
            .cta-block .cta-btn-primary,
            .cta-block .cta-btn-outline {
                padding: 10px 24px;
                font-size: 0.9rem;
            }
        }
        @media (max-width: 520px) {
            .cta-block .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
        }

        /* ===== Footer ===== */
        footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: var(--spacing-xl) 0 0;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-xl);
            padding-bottom: var(--spacing-lg);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .nav-logo {
            color: var(--text-light);
            margin-bottom: var(--spacing-sm);
        }
        .footer-brand .nav-logo i {
            -webkit-text-fill-color: initial;
            background: none;
            color: var(--primary);
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-col h4 {
            color: var(--text-light);
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: var(--spacing-md);
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.88rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--text-light);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--spacing-md) 0;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
        }
        .footer-bottom p {
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            margin-bottom: 0;
        }
        .footer-social {
            display: flex;
            gap: var(--spacing-sm);
        }
        .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, 0.5);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: var(--text-light);
            transform: translateY(-2px);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-lg);
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-md);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            footer {
                padding: var(--spacing-lg) 0 0;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-sm {
            margin-top: var(--spacing-sm);
        }
        .mt-md {
            margin-top: var(--spacing-md);
        }
        .mt-lg {
            margin-top: var(--spacing-lg);
        }
        .mt-xl {
            margin-top: var(--spacing-xl);
        }
        .mb-sm {
            margin-bottom: var(--spacing-sm);
        }
        .mb-md {
            margin-bottom: var(--spacing-md);
        }
        .mb-lg {
            margin-bottom: var(--spacing-lg);
        }
        .gap-sm {
            gap: var(--spacing-sm);
        }
        .gap-md {
            gap: var(--spacing-md);
        }

        /* ===== 返回顶部 ===== */
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: var(--text-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            box-shadow: var(--shadow-md);
            cursor: pointer;
            transition: var(--transition);
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            z-index: 50;
            border: none;
        }
        .back-top.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }
        .back-top:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        @media (max-width: 520px) {
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 38px;
                height: 38px;
                font-size: 0.9rem;
            }
        }