/* roulang page: index */
:root {
            --primary: #1e3a8a;
            --primary-light: #3b82f6;
            --primary-dark: #172b63;
            --accent: #d4a853;
            --accent-light: #e8c97e;
            --accent-dark: #b8893a;
            --bg: #f4f6fb;
            --bg-white: #ffffff;
            --text: #1e293b;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-lg: 24px;
            --shadow: 0 4px 24px rgba(30, 58, 138, 0.08);
            --shadow-lg: 0 12px 40px rgba(30, 58, 138, 0.14);
            --shadow-accent: 0 8px 30px rgba(212, 168, 83, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-w: 264px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        input {
            font-family: inherit;
        }
        .wrapper {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section-pad {
            padding-top: 72px;
            padding-bottom: 72px;
        }

        /* ===== Sidebar ===== */
        .site-layout {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            position: fixed;
            left: 0;
            top: 0;
            bottom: 0;
            width: var(--sidebar-w);
            background: linear-gradient(180deg, #172b63 0%, #1e3a8a 65%, #16306e 100%);
            z-index: 100;
            display: flex;
            flex-direction: column;
            box-shadow: 4px 0 30px rgba(23, 43, 99, 0.28);
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .sidebar-inner {
            display: flex;
            flex-direction: column;
            height: 100%;
            padding: 28px 20px;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 10px 8px 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
            margin-bottom: 28px;
        }
        .brand-icon {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #172b63;
            box-shadow: 0 6px 18px rgba(212, 168, 83, 0.4);
            flex-shrink: 0;
        }
        .brand-text {
            font-size: 17px;
            font-weight: 800;
            color: #fff;
            line-height: 1.35;
            letter-spacing: 0.5px;
        }
        .brand-text small {
            display: block;
            font-size: 12px;
            font-weight: 400;
            color: rgba(255, 255, 255, 0.6);
            letter-spacing: 1px;
            margin-top: 2px;
        }
        .side-nav {
            display: flex;
            flex-direction: column;
            gap: 6px;
            flex: 1;
        }
        .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 13px 16px;
            border-radius: 12px;
            color: rgba(255, 255, 255, 0.72);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .nav-item i {
            width: 22px;
            text-align: center;
            font-size: 16px;
        }
        .nav-item:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
            transform: translateX(2px);
        }
        .nav-item.active {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.08));
            color: #fff;
            border-color: rgba(255, 255, 255, 0.12);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
        }
        .nav-item.active i {
            color: var(--accent-light);
        }
        .nav-item:focus-visible {
            outline: 2px solid var(--accent-light);
            outline-offset: 2px;
        }
        .sidebar-footer {
            padding: 20px 12px 8px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
        }
        .sidebar-footer p {
            color: rgba(255, 255, 255, 0.5);
            font-size: 12px;
            line-height: 1.6;
            letter-spacing: 0.5px;
        }

        /* ===== Content Side ===== */
        .content-side {
            flex: 1;
            margin-left: var(--sidebar-w);
            min-width: 0;
            display: flex;
            flex-direction: column;
        }
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 90;
            background: rgba(23, 43, 99, 0.98);
            backdrop-filter: blur(12px);
            padding: 14px 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
        }
        .mobile-brand {
            color: #fff;
            font-size: 17px;
            font-weight: 800;
            letter-spacing: 0.5px;
        }
        .menu-toggle {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.2);
        }
        .menu-toggle:focus-visible {
            outline: 2px solid var(--accent-light);
            outline-offset: 2px;
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.5);
            z-index: 95;
            backdrop-filter: blur(2px);
        }
        .sidebar-overlay.show {
            display: block;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 30px;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 600;
            line-height: 1.4;
            transition: var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            text-align: center;
        }
        .btn i {
            font-size: 15px;
        }
        .btn-primary {
            background: linear-gradient(135deg, #1e3a8a, #2d4fb0);
            color: #fff;
            box-shadow: 0 8px 24px rgba(30, 58, 138, 0.28);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 32px rgba(30, 58, 138, 0.35);
            background: linear-gradient(135deg, #172b63, #1e3a8a);
        }
        .btn-primary:active {
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(30, 58, 138, 0.25);
        }
        .btn-accent {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #172b63;
            box-shadow: var(--shadow-accent);
        }
        .btn-accent:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(212, 168, 83, 0.35);
            filter: brightness(1.04);
        }
        .btn-outline {
            border-color: rgba(255, 255, 255, 0.5);
            color: #fff;
            background: transparent;
        }
        .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.12);
            transform: translateY(-3px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
        }
        .btn-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 32px rgba(0, 0, 0, 0.12);
        }
        .btn:focus-visible {
            outline: 3px solid rgba(212, 168, 83, 0.5);
            outline-offset: 2px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 620px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 138, 0.75) 55%, rgba(30, 58, 138, 0.3) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            padding: 100px 24px;
            max-width: 680px;
        }
        .hero h1 {
            font-size: 48px;
            line-height: 1.2;
            font-weight: 800;
            color: #fff;
            letter-spacing: 1px;
            margin-bottom: 20px;
        }
        .hero h1 span {
            color: var(--accent-light);
        }
        .hero p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
            margin-bottom: 32px;
            max-width: 560px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: 999px;
            background: rgba(212, 168, 83, 0.2);
            border: 1px solid rgba(212, 168, 83, 0.4);
            color: var(--accent-light);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 24px;
            backdrop-filter: blur(8px);
        }
        .badge i {
            font-size: 12px;
        }

        /* ===== Section Head ===== */
        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-head .badge {
            margin-bottom: 14px;
            background: rgba(212, 168, 83, 0.12);
            border-color: rgba(212, 168, 83, 0.3);
            color: var(--accent-dark);
            padding: 6px 16px;
        }
        .section-head h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text);
            line-height: 1.3;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }
        .section-head p {
            color: var(--text-muted);
            font-size: 16px;
            line-height: 1.7;
        }
        .section-divider {
            border: none;
            height: 1px;
            background: var(--border);
            margin: 0;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(30, 58, 138, 0.15);
        }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 20px;
        }
        .card-icon.primary {
            background: rgba(30, 58, 138, 0.1);
            color: var(--primary);
        }
        .card-icon.accent {
            background: rgba(212, 168, 83, 0.15);
            color: var(--accent-dark);
        }
        .card-icon.green {
            background: rgba(16, 185, 129, 0.12);
            color: #0d9488;
        }
        .card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }
        .card p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 0;
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            color: var(--primary);
            font-weight: 600;
            font-size: 14px;
        }
        .card-link:hover {
            color: var(--accent-dark);
            gap: 10px;
        }

        /* ===== Feature Section ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        /* ===== Category Section ===== */
        .category-section {
            background: linear-gradient(160deg, #f0f4ff 0%, #f8fafc 50%, #fef9f0 100%);
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            transition: var(--transition);
            display: block;
            min-height: 340px;
        }
        .category-card img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .category-card:hover img {
            transform: scale(1.05);
        }
        .category-card-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(23, 43, 99, 0.9) 90%);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 36px 32px;
        }
        .category-card h3 {
            color: #fff;
            font-size: 26px;
            font-weight: 800;
            margin-bottom: 8px;
        }
        .category-card p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .category-card .btn {
            align-self: flex-start;
            padding: 10px 22px;
            font-size: 14px;
        }

        /* ===== News ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .news-card {
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(30, 58, 138, 0.15);
        }
        .news-card a {
            display: block;
            height: 100%;
        }
        .news-img {
            position: relative;
            height: 190px;
            overflow: hidden;
        }
        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .news-card:hover .news-img img {
            transform: scale(1.05);
        }
        .news-cat {
            position: absolute;
            top: 14px;
            left: 14px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #172b63;
            font-size: 13px;
            font-weight: 700;
            padding: 5px 14px;
            border-radius: 999px;
            box-shadow: 0 4px 12px rgba(212, 168, 83, 0.4);
        }
        .news-body {
            padding: 22px 24px 24px;
        }
        .news-body h3 {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.5;
            color: var(--text);
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-body h3:hover {
            color: var(--primary);
        }
        .news-body p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
        }
        .news-meta {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-light);
            font-size: 13px;
        }
        .news-meta i {
            font-size: 12px;
        }
        .empty-state {
            background: #fff;
            border-radius: var(--radius);
            border: 1px dashed var(--border);
            padding: 48px 32px;
            text-align: center;
            grid-column: 1 / -1;
            color: var(--text-light);
            font-size: 15px;
        }

        /* ===== Process / Steps ===== */
        .process-section {
            background: linear-gradient(145deg, #172b63, #1e3a8a);
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .process-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(212, 168, 83, 0.08);
        }
        .process-section .section-head h2 {
            color: #fff;
        }
        .process-section .section-head p {
            color: rgba(255, 255, 255, 0.7);
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            margin-top: 20px;
        }
        .process-item {
            text-align: center;
            padding: 36px 20px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .process-item:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-6px);
            border-color: rgba(212, 168, 83, 0.4);
        }
        .process-num {
            width: 52px;
            height: 52px;
            margin: 0 auto 18px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            color: #172b63;
            font-size: 22px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 24px rgba(212, 168, 83, 0.3);
        }
        .process-item h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .process-item p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
        }

        /* ===== Stats ===== */
        .stats-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .stat-item {
            text-align: center;
            padding: 12px;
        }
        .stat-num {
            font-size: 44px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.2;
            margin-bottom: 8px;
        }
        .stat-label {
            color: var(--text-muted);
            font-size: 14px;
            font-weight: 500;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: #fff;
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: #f8fafc;
            border: 1px solid var(--border);
            border-radius: 14px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(30, 58, 138, 0.2);
        }
        .faq-item.open {
            border-color: rgba(30, 58, 138, 0.3);
            box-shadow: var(--shadow);
            background: #fff;
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question:focus-visible {
            outline: 2px solid rgba(212, 168, 83, 0.5);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-light);
            transition: transform 0.3s;
            flex-shrink: 0;
            margin-left: 16px;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .faq-answer-inner {
            padding: 0 24px 20px;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            overflow: hidden;
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
        }
        .cta-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(23, 43, 99, 0.94), rgba(30, 58, 138, 0.82));
        }
        .cta-content {
            position: relative;
            z-index: 1;
            padding: 90px 24px;
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }
        .cta-content h2 {
            font-size: 38px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .cta-content p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 16px;
            margin-bottom: 30px;
            line-height: 1.7;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        /* ===== Footer ===== */
        .footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 24px 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer h3 {
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer p {
            color: #94a3b8;
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .footer h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 14px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            font-size: 14px;
            color: #94a3b8;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 24px auto 0;
            text-align: center;
            font-size: 13px;
            color: #64748b;
            line-height: 1.8;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .content-side {
                margin-left: 0;
            }
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .mobile-header {
                display: flex;
            }
            .feature-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 768px) {
            .section-pad {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .hero {
                min-height: 520px;
            }
            .hero h1 {
                font-size: 34px;
            }
            .hero p {
                font-size: 15px;
            }
            .hero-content {
                padding: 70px 20px;
            }
            .section-head h2 {
                font-size: 28px;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .category-card,
            .category-card img {
                min-height: 260px;
                height: 260px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .cta-content h2 {
                font-size: 28px;
            }
            .cta-content {
                padding: 60px 20px;
            }
        }
        @media (max-width: 520px) {
            .wrapper {
                padding-left: 16px;
                padding-right: 16px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .btn {
                padding: 12px 20px;
                font-size: 14px;
            }
            .category-card-overlay {
                padding: 24px 20px;
            }
        }

        /* ===== Animation ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .hero-content {
            animation: fadeInUp 0.8s ease-out;
        }
        .scroll-fade {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .scroll-fade.in-view {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang page: category1 */
:root {
            --primary: #1e3a8a;
            --primary-light: #3b82f6;
            --primary-dark: #172554;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg: #f6f8fc;
            --bg-card: #ffffff;
            --text: #1f2937;
            --text-weak: #6b7280;
            --border: #e5e7eb;
            --radius: 16px;
            --radius-lg: 24px;
            --shadow: 0 4px 20px rgba(30, 58, 138, 0.06);
            --shadow-lg: 0 12px 40px rgba(30, 58, 138, 0.12);
            --sidebar-width: 260px;
            --transition: 0.3s ease;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

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

        button,
        input {
            font-family: inherit;
        }

        .app-shell {
            display: flex;
            min-height: 100vh;
        }

        .side-nav {
            width: var(--sidebar-width);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            background: linear-gradient(180deg, #172554 0%, #1e3a8a 100%);
            color: #fff;
            z-index: 60;
            display: flex;
            flex-direction: column;
            padding: 28px 20px;
            box-shadow: 4px 0 24px rgba(0, 0, 0, 0.08);
            overflow-y: auto;
        }

        .side-nav .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 8px 24px;
            margin-bottom: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
        }

        .side-nav .logo i {
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(245, 158, 11, 0.18);
            color: var(--accent-light);
            border-radius: 12px;
            font-size: 20px;
            flex-shrink: 0;
        }

        .side-nav .logo-text {
            font-size: 16px;
            font-weight: 700;
            letter-spacing: 0.5px;
            line-height: 1.4;
            color: #fff;
        }

        .side-nav .nav-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .side-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 13px 16px;
            border-radius: 12px;
            color: rgba(255, 255, 255, 0.78);
            font-size: 15px;
            font-weight: 500;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }

        .side-nav .nav-item i {
            width: 22px;
            text-align: center;
            font-size: 17px;
        }

        .side-nav .nav-item:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            transform: translateX(4px);
        }

        .side-nav .nav-item.active {
            background: rgba(245, 158, 11, 0.18);
            color: var(--accent-light);
            font-weight: 600;
            border-left: 3px solid var(--accent-light);
        }

        .side-nav .nav-item:focus-visible {
            outline: 2px solid var(--accent-light);
            outline-offset: 2px;
        }

        .side-nav .nav-bottom {
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.6;
        }

        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            min-width: 0;
        }

        .mobile-topbar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 55;
            background: rgba(23, 37, 84, 0.95);
            backdrop-filter: blur(12px);
            padding: 14px 20px;
            align-items: center;
            justify-content: space-between;
            color: #fff;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
        }

        .mobile-topbar .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 15px;
        }

        .mobile-topbar .logo i {
            color: var(--accent-light);
            font-size: 20px;
        }

        .mobile-topbar .burger {
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: #fff;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            font-size: 18px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background var(--transition);
        }

        .mobile-topbar .burger:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: 280px;
            background: #1e3a8a;
            z-index: 70;
            padding: 24px 20px;
            transform: translateX(-100%);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 8px 0 30px rgba(0, 0, 0, 0.2);
            overflow-y: auto;
        }

        .mobile-nav.open {
            transform: translateX(0);
        }

        .mobile-nav .close-btn {
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: #fff;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            font-size: 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: auto;
            margin-bottom: 20px;
        }

        .mobile-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 12px;
            color: rgba(255, 255, 255, 0.8);
            border-radius: 10px;
            font-size: 15px;
            margin-bottom: 6px;
        }

        .mobile-nav .nav-item.active {
            background: rgba(245, 158, 11, 0.18);
            color: var(--accent-light);
            font-weight: 600;
        }

        .mobile-nav .nav-item:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 65;
            backdrop-filter: blur(2px);
        }

        .overlay.show {
            display: block;
        }

        .category-hero {
            position: relative;
            background: linear-gradient(135deg, rgba(23, 37, 84, 0.92), rgba(30, 58, 138, 0.78)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            padding: 80px 56px 72px;
            color: #fff;
            overflow: hidden;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            right: -80px;
            top: -80px;
            width: 260px;
            height: 260px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.25) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 24px;
        }

        .category-hero .breadcrumb a:hover {
            color: var(--accent-light);
        }

        .category-hero .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
            font-size: 12px;
        }

        .category-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(245, 158, 11, 0.18);
            border: 1px solid rgba(245, 158, 11, 0.4);
            color: var(--accent-light);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .category-hero h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.2;
            margin: 0 0 20px;
            letter-spacing: 1px;
            max-width: 720px;
        }

        .category-hero p.description {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.88);
            max-width: 620px;
            margin: 0 0 32px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            border-radius: 12px;
            padding: 13px 28px;
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            line-height: 1.4;
        }

        .btn-primary {
            background: var(--accent);
            color: #172554;
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
        }

        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(245, 158, 11, 0.4);
        }

        .btn-outline-light {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.35);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.18);
            border-color: rgba(255, 255, 255, 0.6);
            transform: translateY(-2px);
        }

        .section {
            padding: 72px 56px;
        }

        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 24px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
            position: relative;
            padding-left: 18px;
        }

        .section-header h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            width: 5px;
            height: 26px;
            background: var(--accent);
            border-radius: 4px;
        }

        .section-header .subtitle {
            color: var(--text-weak);
            font-size: 15px;
            margin: 0;
        }

        .section-header .view-all {
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color var(--transition);
        }

        .section-header .view-all:hover {
            color: var(--accent-600);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: opacity var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(59, 130, 246, 0.2);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-card .icon-box {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: linear-gradient(135deg, #eff6ff, #dbeafe);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 22px;
            margin-bottom: 20px;
            transition: background var(--transition);
        }

        .feature-card:hover .icon-box {
            background: linear-gradient(135deg, #fef3c7, #fde68a);
            color: var(--accent-600);
        }

        .feature-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 12px;
        }

        .feature-card p {
            color: var(--text-weak);
            font-size: 14px;
            line-height: 1.75;
            margin: 0;
        }

        .type-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .type-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px;
            border: 1px solid var(--border);
            display: flex;
            gap: 24px;
            align-items: flex-start;
            transition: all var(--transition);
            box-shadow: var(--shadow);
        }

        .type-item:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: rgba(245, 158, 11, 0.3);
        }

        .type-num {
            font-size: 32px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1;
            opacity: 0.7;
        }

        .type-item h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
        }

        .type-item p {
            color: var(--text-weak);
            font-size: 14px;
            line-height: 1.7;
            margin: 0 0 12px;
        }

        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #f0f4ff;
            color: var(--primary);
            border-radius: 999px;
            padding: 4px 14px;
            font-size: 12px;
            font-weight: 600;
            transition: all var(--transition);
        }

        .badge:hover {
            background: var(--accent-light);
            color: #172554;
        }

        .badge-accent {
            background: #fef3c7;
            color: #92400e;
        }

        .steps-section {
            background: linear-gradient(135deg, #172554 0%, #1e3a8a 100%);
            color: #fff;
        }

        .steps-section .section-header h2 {
            color: #fff;
        }

        .steps-section .section-header .subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        .steps-section .section-header h2::before {
            background: var(--accent);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 8px;
        }

        .step-card {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius);
            padding: 30px 24px;
            transition: all var(--transition);
            position: relative;
        }

        .step-card:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(245, 158, 11, 0.4);
            transform: translateY(-4px);
        }

        .step-card .step-no {
            font-size: 40px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 14px;
            line-height: 1;
        }

        .step-card h4 {
            font-size: 17px;
            font-weight: 700;
            margin: 0 0 10px;
            color: #fff;
        }

        .step-card p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 13px;
            line-height: 1.7;
            margin: 0;
        }

        .article-section {
            background: #fff;
        }

        .article-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .article-row {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 22px 8px;
            border-bottom: 1px solid var(--border);
            transition: background var(--transition);
            border-radius: 10px;
        }

        .article-row:hover {
            background: #f8fafc;
        }

        .article-row:last-child {
            border-bottom: none;
        }

        .article-thumb {
            width: 120px;
            height: 78px;
            border-radius: 10px;
            object-fit: cover;
            flex-shrink: 0;
            background: #e5e7eb;
        }

        .article-info {
            flex: 1;
            min-width: 0;
        }

        .article-info h4 {
            font-size: 17px;
            font-weight: 600;
            margin: 0 0 8px;
            color: var(--text);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .article-info h4 a:hover {
            color: var(--primary);
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-weak);
        }

        .article-meta i {
            font-size: 12px;
            margin-right: 4px;
            color: var(--accent);
        }

        .faq-section {
            background: var(--bg);
        }

        .faq-list {
            max-width: 860px;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(59, 130, 246, 0.25);
        }

        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 22px 28px;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 12px;
            transition: background var(--transition);
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary i {
            color: var(--accent);
            font-size: 15px;
            width: 24px;
            text-align: center;
        }

        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            margin-left: auto;
            color: var(--text-weak);
            font-size: 14px;
            transition: transform var(--transition);
        }

        .faq-item[open] summary {
            background: #f8fafc;
        }

        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }

        .faq-item .faq-answer {
            padding: 0 28px 24px;
            color: var(--text-weak);
            font-size: 14px;
            line-height: 1.8;
        }

        .cta-section {
            background: linear-gradient(135deg, rgba(245, 158, 11, 0.95), rgba(217, 119, 6, 0.95));
            margin: 0 56px 72px;
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            box-shadow: 0 20px 50px rgba(217, 119, 6, 0.25);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/coverpic/cover-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: luminosity;
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 800;
            color: #172554;
            margin: 0 0 12px;
            position: relative;
        }

        .cta-section p {
            color: rgba(23, 37, 84, 0.75);
            font-size: 16px;
            max-width: 560px;
            margin: 0 auto 28px;
            position: relative;
        }

        .cta-section .btn-dark {
            background: #172554;
            color: #fff;
            box-shadow: 0 8px 24px rgba(23, 37, 84, 0.3);
        }

        .cta-section .btn-dark:hover {
            background: #1e3a8a;
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(23, 37, 84, 0.4);
        }

        .footer {
            background: #172554;
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 56px 28px;
            margin-left: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 48px;
        }

        .footer-brand h3 {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 16px;
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.8;
            max-width: 360px;
        }

        .footer h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 18px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            transition: color var(--transition), padding-left var(--transition);
        }

        .footer-links a:hover {
            color: var(--accent-light);
            padding-left: 6px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }

        .footer-bottom p {
            margin: 0;
        }

        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 46px;
            height: 46px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            cursor: pointer;
            box-shadow: 0 8px 24px rgba(30, 58, 138, 0.3);
            z-index: 45;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition);
        }

        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--primary-light);
            transform: translateY(-4px);
        }

        .stat-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 8px;
        }

        .stat-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 28px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .stat-card .stat-number {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
        }

        .stat-card .stat-label {
            font-size: 14px;
            color: var(--text-weak);
            margin-top: 12px;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .side-nav {
                display: none;
            }

            .mobile-topbar {
                display: flex;
            }

            .main-content {
                margin-left: 0;
            }

            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .type-list {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .category-hero {
                padding: 60px 28px 56px;
            }

            .category-hero h1 {
                font-size: 32px;
            }

            .section {
                padding: 52px 24px;
            }

            .cta-section {
                margin: 0 24px 56px;
                padding: 44px 28px;
            }

            .footer {
                padding: 48px 24px 24px;
            }
        }

        @media (max-width: 520px) {
            .category-hero {
                padding: 48px 20px 44px;
            }

            .category-hero h1 {
                font-size: 26px;
            }

            .category-hero p.description {
                font-size: 15px;
            }

            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }

            .section {
                padding: 44px 18px;
            }

            .section-header h2 {
                font-size: 22px;
            }

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

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

            .stat-grid {
                grid-template-columns: 1fr;
            }

            .article-row {
                flex-direction: column;
                align-items: flex-start;
            }

            .article-thumb {
                width: 100%;
                height: 160px;
            }

            .article-info h4 {
                white-space: normal;
                line-height: 1.5;
            }

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

            .cta-section {
                margin: 0 18px 44px;
                padding: 36px 20px;
            }

            .cta-section h2 {
                font-size: 24px;
            }
        }

/* roulang page: article */
:root {
    --primary: #1b2a4e;
    --primary-light: #2b3f68;
    --primary-dark: #111c36;
    --accent: #d4a642;
    --accent-light: #e8c56a;
    --accent-dark: #b58a2e;
    --bg: #f6f7fb;
    --surface: #ffffff;
    --text: #1f2937;
    --text-soft: #6b7280;
    --text-faint: #9ca3af;
    --border: #e5e7eb;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 6px 30px rgba(27, 42, 78, 0.08);
    --shadow-lg: 0 16px 50px rgba(27, 42, 78, 0.14);
    --sidebar-width: 264px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }

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

  a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s, background 0.2s, opacity 0.2s;
  }

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

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
  }

  .text-accent {
    color: var(--accent) !important;
  }

  /* ===== 左侧导航 ===== */
  .app-shell {
    display: flex;
    min-height: 100vh;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #16233f 0%, #0f1930 100%);
    color: #fff;
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 28px 20px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 8px 28px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 24px;
  }

  .brand-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--accent) 0%, #f0d68a 100%);
    border-radius: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 20px;
    box-shadow: 0 6px 18px rgba(212, 166, 66, 0.3);
    flex-shrink: 0;
  }

  .brand-name {
    display: block;
    font-weight: 800;
    font-size: 17px;
    line-height: 1.3;
    letter-spacing: 0.5px;
  }

  .brand-sub {
    display: block;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    margin-top: 2px;
  }

  .nav-label {
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    padding: 0 12px 12px;
    display: block;
  }

  .side-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    color: rgba(255, 255, 255, 0.62);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
  }

  .nav-item i {
    width: 20px;
    text-align: center;
    font-size: 16px;
  }

  .nav-item:hover {
    background: rgba(255, 255, 255, 0.07);
    color: #fff;
    transform: translateX(3px);
  }

  .nav-item.active {
    background: linear-gradient(135deg, rgba(212, 166, 66, 0.22), rgba(212, 166, 66, 0.1));
    color: #f5d78a;
    box-shadow: inset 0 0 0 1px rgba(212, 166, 66, 0.3);
  }

  .sidebar-card {
    margin-top: auto;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 18px 16px;
    text-align: center;
  }

  .sidebar-card-icon {
    width: 42px;
    height: 42px;
    margin: 0 auto 10px;
    border-radius: 12px;
    background: rgba(212, 166, 66, 0.18);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
  }

  .sidebar-card p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 10px;
    line-height: 1.6;
  }

  .sidebar-card a {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    background: rgba(212, 166, 66, 0.12);
    border: 1px solid rgba(212, 166, 66, 0.25);
    padding: 6px 16px;
    border-radius: 100px;
    transition: var(--transition);
  }

  .sidebar-card a:hover {
    background: rgba(212, 166, 66, 0.24);
    color: #fff;
  }

  /* ===== 主区域 ===== */
  .main-area {
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: calc(100% - var(--sidebar-width));
  }

  .mobile-header {
    display: none;
  }

  .mobile-drawer,
  .drawer-overlay {
    display: none;
  }

  /* ===== 文章 Hero ===== */
  .article-hero {
    position: relative;
    padding: 110px 0 150px;
    color: #fff;
    overflow: hidden;
    background-color: #16233f;
  }

  .hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.45;
  }

  .hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(17, 28, 54, 0.96) 0%, rgba(27, 42, 78, 0.86) 55%, rgba(212, 166, 66, 0.3) 100%);
  }

  .hero-content {
    position: relative;
    z-index: 2;
    max-width: 860px;
  }

  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 22px;
    flex-wrap: wrap;
  }

  .breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
  }

  .breadcrumb a:hover {
    color: var(--accent);
  }

  .breadcrumb i {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.35);
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(212, 166, 66, 0.15);
    border: 1px solid rgba(212, 166, 66, 0.4);
    color: #f5d78a;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 13px;
    letter-spacing: 0.5px;
    backdrop-filter: blur(8px);
  }

  .article-hero h1 {
    font-size: clamp(28px, 4.2vw, 44px);
    font-weight: 800;
    line-height: 1.3;
    margin: 18px 0 0;
    letter-spacing: 0.5px;
    text-wrap: balance;
  }

  /* ===== 统计条 ===== */
  .article-stats-wrap {
    position: relative;
    z-index: 10;
    margin-top: -70px;
  }

  .article-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .stat-card {
    background: var(--surface);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 18px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
  }

  .stat-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: #eef3fb;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    flex-shrink: 0;
  }

  .stat-info span {
    display: block;
    font-size: 12px;
    color: var(--text-faint);
  }

  .stat-info strong {
    font-size: 14px;
    color: var(--text);
    font-weight: 700;
    display: block;
    margin-top: 2px;
  }

  /* ===== 文章正文 ===== */
  .article-section {
    padding: 50px 0 70px;
    background: var(--bg);
  }

  .article-container {
    max-width: 900px;
  }

  .prose-content {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 48px;
    font-size: 16px;
    line-height: 1.95;
    color: #374151;
  }

  .prose-content > * + * {
    margin-top: 1.2em;
  }

  .prose-content h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-top: 2em;
    margin-bottom: 0.8em;
    padding-left: 14px;
    border-left: 4px solid var(--accent);
    line-height: 1.4;
  }

  .prose-content h3 {
    font-size: 19px;
    font-weight: 700;
    color: var(--primary);
    margin-top: 1.8em;
    margin-bottom: 0.7em;
    line-height: 1.5;
  }

  .prose-content p {
    margin-bottom: 1.4em;
    color: #3d4757;
  }

  .prose-content a {
    color: var(--accent-dark);
    text-decoration: underline;
    text-underline-offset: 2px;
  }

  .prose-content img {
    border-radius: 14px;
    margin: 28px 0;
    box-shadow: var(--shadow);
  }

  .prose-content ul,
  .prose-content ol {
    padding-left: 24px;
    margin-bottom: 1.4em;
  }

  .prose-content ul li {
    list-style: disc;
    margin-bottom: 0.4em;
  }

  .prose-content ol li {
    list-style: decimal;
    margin-bottom: 0.4em;
  }

  .prose-content blockquote {
    border-left: 4px solid var(--accent);
    background: #faf8f1;
    padding: 16px 22px;
    border-radius: 0 12px 12px 0;
    color: #6b7280;
    font-style: italic;
    margin: 24px 0;
  }

  .prose-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
  }

  .prose-content th,
  .prose-content td {
    border: 1px solid var(--border);
    padding: 10px 14px;
    text-align: left;
  }

  .prose-content th {
    background: #f2f4f9;
    font-weight: 600;
  }

  .article-divider {
    height: 1px;
    background: var(--border);
    margin: 40px 0 0;
  }

  .article-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    margin-top: 30px;
  }

  .tag-wrap {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
  }

  .tag-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-right: 4px;
  }

  .tag {
    display: inline-block;
    font-size: 13px;
    background: #f2f4f9;
    border: 1px solid var(--border);
    padding: 4px 14px;
    border-radius: 100px;
    color: var(--text-soft);
    transition: var(--transition);
  }

  .tag:hover {
    border-color: var(--accent);
    color: var(--accent-dark);
  }

  .article-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }

  /* ===== 按钮 ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: transform 0.25s, box-shadow 0.25s, background 0.25s, color 0.25s;
    cursor: pointer;
    border: 1px solid transparent;
    white-space: nowrap;
  }

  .btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 8px 22px rgba(27, 42, 78, 0.22);
  }

  .btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(27, 42, 78, 0.28);
  }

  .btn-accent {
    background: linear-gradient(135deg, var(--accent), #e8c56a);
    color: #1b2437;
    box-shadow: 0 8px 22px rgba(212, 166, 66, 0.3);
  }

  .btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(212, 166, 66, 0.38);
  }

  .btn-ghost {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(6px);
  }

  .btn-ghost:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
  }

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

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

  .btn:focus-visible,
  a:focus-visible,
  button:focus-visible {
    outline: 3px solid rgba(212, 166, 66, 0.55);
    outline-offset: 2px;
  }

  /* ===== 内容未找到 ===== */
  .not-found {
    text-align: center;
    padding: 80px 30px;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

  .not-found-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    border-radius: 50%;
    background: #f2f4f9;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 34px;
    color: var(--accent);
  }

  .not-found h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--text);
  }

  .not-found p {
    color: var(--text-soft);
    margin-bottom: 28px;
  }

  .not-found-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
  }

  /* ===== 相关推荐 ===== */
  .related-section {
    padding: 74px 0;
    background: #eef1f7;
  }

  .section-head {
    text-align: center;
    max-width: 620px;
    margin: 0 auto 44px;
  }

  .section-kicker {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 12px;
  }

  .section-head h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--text);
    letter-spacing: 0.5px;
  }

  .section-head p {
    color: var(--text-soft);
    font-size: 16px;
  }

  .related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .post-card {
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.35s, box-shadow 0.35s;
    display: block;
  }

  .post-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
  }

  .post-cover {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--primary);
  }

  .post-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
  }

  .post-card:hover .post-cover img {
    transform: scale(1.05);
  }

  .post-cat {
    position: absolute;
    left: 14px;
    top: 14px;
    background: rgba(17, 28, 54, 0.82);
    color: #f5d78a;
    font-size: 12px;
    padding: 5px 12px;
    border-radius: 100px;
    backdrop-filter: blur(6px);
  }

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

  .post-body h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.5;
    color: var(--text);
    transition: color 0.25s;
  }

  .post-card:hover .post-body h3 {
    color: var(--accent-dark);
  }

  .post-body p {
    color: var(--text-soft);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 14px;
  }

  .post-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-dark);
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }

  .post-link i {
    transition: transform 0.3s;
  }

  .post-card:hover .post-link i {
    transform: translateX(4px);
  }

  /* ===== FAQ ===== */
  .faq-section {
    padding: 72px 0;
    background: var(--bg);
  }

  .faq-container {
    max-width: 820px;
  }

  .faq-list {
    display: flex;
    flex-direction: column;
  }

  .faq-item {
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 14px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    margin-bottom: 14px;
    overflow: hidden;
    transition: box-shadow 0.3s;
  }

  .faq-item[open] {
    box-shadow: var(--shadow);
  }

  .faq-question {
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    line-height: 1.5;
  }

  .faq-question::-webkit-details-marker {
    display: none;
  }

  .faq-question::after {
    content: '+';
    font-size: 22px;
    color: var(--accent);
    font-weight: 400;
    transition: transform 0.3s;
    flex-shrink: 0;
  }

  .faq-item[open] .faq-question::after {
    transform: rotate(45deg);
  }

  .faq-answer {
    padding: 14px 24px 22px;
    color: var(--text-soft);
    font-size: 15px;
    line-height: 1.8;
    border-top: 1px dashed var(--border);
  }

  /* ===== CTA ===== */
  .cta-section {
    position: relative;
    padding: 80px 0;
    color: #fff;
    overflow: hidden;
  }

  .cta-bg,
  .cta-overlay {
    position: absolute;
    inset: 0;
  }

  .cta-bg {
    background-size: cover;
    background-position: center;
    opacity: 0.4;
  }

  .cta-overlay {
    background: linear-gradient(135deg, rgba(17, 28, 54, 0.94), rgba(27, 42, 78, 0.88));
  }

  .cta-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 700px;
  }

  .cta-content h2 {
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
  }

  .cta-content p {
    color: rgba(255, 255, 255, 0.78);
    margin-bottom: 28px;
    font-size: 17px;
  }

  .cta-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
  }

  /* ===== Footer ===== */
  .footer {
    background: #101a30;
    color: rgba(255, 255, 255, 0.72);
    padding: 58px 48px 28px;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .footer-brand h3 {
    color: #fff;
    font-size: 18px;
    margin-bottom: 14px;
  }

  .footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.58);
    max-width: 360px;
  }

  .footer h4 {
    color: #fff;
    font-size: 15px;
    margin-bottom: 16px;
  }

  .footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .footer-links a {
    color: rgba(255, 255, 255, 0.66);
    font-size: 14px;
    transition: color 0.3s;
  }

  .footer-links a:hover {
    color: var(--accent);
  }

  .footer-links a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
  }

  .footer p {
    font-size: 14px;
    margin-bottom: 6px;
  }

  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 44px;
    padding-top: 22px;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
  }

  /* ===== 移动端 ===== */
  @media (max-width: 1023px) {
    .sidebar {
      display: none;
    }

    .main-area {
      margin-left: 0;
      width: 100%;
    }

    .mobile-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 90;
      height: 60px;
      padding: 0 20px;
      background: rgba(22, 35, 63, 0.96);
      backdrop-filter: blur(10px);
      color: #fff;
    }

    .mobile-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 15px;
    }

    .mobile-brand i {
      color: var(--accent);
      font-size: 17px;
    }

    .menu-toggle {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      color: #fff;
      font-size: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(255, 255, 255, 0.1);
    }

    .menu-toggle:hover {
      background: rgba(255, 255, 255, 0.18);
    }

    .mobile-drawer {
      display: flex;
      flex-direction: column;
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      width: 284px;
      background: linear-gradient(180deg, #16233f, #0f1930);
      z-index: 130;
      padding: 22px 18px;
      transform: translateX(-110%);
      transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
      box-shadow: 4px 0 30px rgba(0, 0, 0, 0.25);
    }

    .mobile-drawer.open {
      transform: translateX(0);
    }

    .mobile-drawer-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-bottom: 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      margin-bottom: 20px;
    }

    .drawer-title {
      color: #fff;
      font-weight: 700;
      font-size: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .drawer-close {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.08);
      color: rgba(255, 255, 255, 0.8);
      font-size: 15px;
    }

    .drawer-close:hover {
      background: rgba(255, 255, 255, 0.16);
    }

    .drawer-nav {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .drawer-nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      width: 100%;
      padding: 13px 14px;
      border-radius: 12px;
      color: rgba(255, 255, 255, 0.65);
      font-size: 15px;
      font-weight: 500;
      transition: var(--transition);
    }

    .drawer-nav-item i {
      width: 20px;
      text-align: center;
    }

    .drawer-nav-item:hover {
      background: rgba(255, 255, 255, 0.07);
      color: #fff;
    }

    .drawer-nav-item.active {
      background: rgba(212, 166, 66, 0.18);
      color: #f5d78a;
    }

    .drawer-overlay.open {
      display: block;
      position: fixed;
      inset: 0;
      background: rgba(15, 25, 48, 0.45);
      z-index: 120;
      backdrop-filter: blur(2px);
    }
  }

  @media (max-width: 767px) {
    .article-hero {
      padding: 70px 0 110px;
    }

    .article-hero h1 {
      font-size: 28px;
    }

    .article-stats-wrap {
      margin-top: -50px;
    }

    .article-stats {
      grid-template-columns: 1fr;
      gap: 12px;
    }

    .stat-card {
      padding: 14px 16px;
    }

    .article-section {
      padding: 36px 0 50px;
    }

    .prose-content {
      padding: 28px 20px;
      font-size: 15px;
    }

    .article-bottom {
      flex-direction: column;
      align-items: flex-start;
    }

    .related-section {
      padding: 56px 0;
    }

    .related-grid {
      grid-template-columns: 1fr;
      gap: 18px;
    }

    .section-head {
      margin-bottom: 32px;
    }

    .section-head h2 {
      font-size: 26px;
    }

    .faq-section {
      padding: 56px 0;
    }

    .faq-question {
      padding: 16px 18px;
      font-size: 15px;
    }

    .faq-answer {
      padding: 12px 18px 18px;
    }

    .cta-section {
      padding: 60px 0;
    }

    .cta-content h2 {
      font-size: 26px;
    }

    .cta-content p {
      font-size: 15px;
    }

    .footer {
      padding: 44px 24px 24px;
    }

    .footer-grid {
      grid-template-columns: 1fr;
      gap: 28px;
    }

    .footer-bottom {
      margin-top: 32px;
    }
  }