/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1b3d;
            --primary-light: #1a2d5e;
            --primary-dark: #0a122c;
            --accent: #2d7ff9;
            --accent-hover: #1a6ae0;
            --accent-light: #e8f0fe;
            --cyan: #00d4aa;
            --cyan-hover: #00b898;
            --bg: #f5f7fc;
            --bg-white: #ffffff;
            --bg-dark: #0a122c;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-sm: 8px;
            --shadow: 0 4px 20px rgba(15, 27, 61, 0.08);
            --shadow-lg: 0 12px 40px rgba(15, 27, 61, 0.15);
            --shadow-accent: 0 6px 24px rgba(45, 127, 249, 0.35);
            --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;
            --spacing: 80px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: 72px;
            padding-bottom: 0;
        }
        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;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            color: var(--primary);
            font-weight: 700;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Section Spacing ===== */
        section {
            padding: var(--spacing) 0;
        }
        .section-title {
            font-size: 2.2rem;
            text-align: center;
            margin-bottom: 12px;
            color: var(--primary);
        }
        .section-subtitle {
            font-size: 1.1rem;
            text-align: center;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto 48px auto;
            line-height: 1.6;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), var(--cyan));
            border-radius: 4px;
            margin: 16px auto 40px auto;
        }

        /* ===== Header / Navigation (桌面端) ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
            transition: background var(--transition), box-shadow var(--transition);
            height: 72px;
        }
        .site-header.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 20px rgba(15, 27, 61, 0.08);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .site-logo i {
            font-size: 1.8rem;
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .site-logo span {
            -webkit-text-fill-color: var(--primary);
        }
        .site-logo:hover {
            color: var(--primary);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a i {
            font-size: 1rem;
        }
        .nav-list a:hover {
            color: var(--accent);
            background: var(--accent-light);
        }
        .nav-list a.active {
            color: var(--accent);
            background: var(--accent-light);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 3px;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            color: #fff !important;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-accent);
        }
        .nav-cta i {
            font-size: 1rem;
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(45, 127, 249, 0.4);
            background: linear-gradient(135deg, var(--accent-hover), var(--cyan-hover));
            color: #fff !important;
        }

        /* ===== Mobile Bottom Tab Navigation ===== */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1100;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-top: 1px solid var(--border);
            box-shadow: 0 -4px 20px rgba(15, 27, 61, 0.06);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            height: 64px;
        }
        .mobile-bottom-nav .tab-bar {
            display: flex;
            align-items: center;
            justify-content: space-around;
            max-width: 500px;
            margin: 0 auto;
            height: 100%;
        }
        .mobile-bottom-nav .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-size: 0.7rem;
            font-weight: 500;
            transition: all var(--transition);
            min-width: 64px;
            text-decoration: none;
        }
        .mobile-bottom-nav .tab-item i {
            font-size: 1.4rem;
            transition: all var(--transition);
        }
        .mobile-bottom-nav .tab-item span {
            font-size: 0.65rem;
            line-height: 1.2;
        }
        .mobile-bottom-nav .tab-item:hover {
            color: var(--accent);
            background: var(--accent-light);
        }
        .mobile-bottom-nav .tab-item.active {
            color: var(--accent);
        }
        .mobile-bottom-nav .tab-item.active i {
            transform: scale(1.05);
        }
        .mobile-bottom-nav .tab-item.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: var(--accent);
            border-radius: 3px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 100px 0 80px;
            background: var(--primary-dark);
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 18, 44, 0.92) 0%, rgba(15, 27, 61, 0.80) 50%, rgba(26, 45, 94, 0.70) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            background: rgba(45, 127, 249, 0.2);
            border: 1px solid rgba(45, 127, 249, 0.3);
            border-radius: 30px;
            color: var(--cyan);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 0.9rem;
        }
        .hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -1px;
            line-height: 1.2;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            color: rgba(241, 245, 249, 0.8);
            max-width: 640px;
            margin: 0 auto 36px auto;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 16px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-accent);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(45, 127, 249, 0.45);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1.05rem;
            transition: all var(--transition);
            backdrop-filter: blur(4px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.3);
            color: #fff;
            transform: translateY(-3px);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px;
            margin-top: 48px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
        }
        .hero-stat .num .accent {
            color: var(--cyan);
        }
        .hero-stat .label {
            font-size: 0.85rem;
            color: rgba(241, 245, 249, 0.6);
            margin-top: 4px;
        }

        /* ===== Features / 优势板块 ===== */
        .features {
            background: var(--bg-white);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg);
            border-radius: var(--radius-lg);
            padding: 36px 28px 32px;
            text-align: center;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border);
            background: var(--bg-white);
        }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--accent-light), #dbeafe);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px auto;
            font-size: 1.8rem;
            color: var(--accent);
            transition: all var(--transition);
        }
        .feature-card:hover .icon {
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            color: #fff;
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
            color: var(--primary);
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* ===== Category / 分类入口 ===== */
        .category-section {
            background: var(--bg);
        }
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-white);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .category-card:hover .card-img {
            transform: scale(1.05);
        }
        .category-card .card-body {
            padding: 24px 28px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .card-body h3 {
            font-size: 1.3rem;
            margin-bottom: 8px;
            color: var(--primary);
        }
        .category-card .card-body p {
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.6;
            flex: 1;
        }
        .category-card .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--border);
        }
        .category-card .tag {
            padding: 4px 14px;
            background: var(--accent-light);
            color: var(--accent);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
        }
        .category-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--accent);
            transition: all var(--transition);
        }
        .category-card .card-link:hover {
            gap: 12px;
        }

        /* ===== Latest Posts / 最新资讯 ===== */
        .latest-posts {
            background: var(--bg-white);
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .post-card {
            display: flex;
            gap: 20px;
            background: var(--bg);
            border-radius: var(--radius);
            padding: 20px;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .post-card:hover {
            border-color: var(--border);
            box-shadow: var(--shadow);
            transform: translateY(-3px);
            background: var(--bg-white);
        }
        .post-card .post-thumb {
            width: 140px;
            height: 100px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .post-card .post-info {
            flex: 1;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }
        .post-card .post-cat {
            display: inline-block;
            padding: 2px 12px;
            background: var(--accent-light);
            color: var(--accent);
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 500;
            margin-bottom: 6px;
            width: fit-content;
        }
        .post-card h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--primary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card h4 a {
            color: inherit;
        }
        .post-card h4 a:hover {
            color: var(--accent);
        }
        .post-card .post-excerpt {
            font-size: 0.88rem;
            color: var(--text-light);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 8px;
            flex: 1;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-light);
        }
        .post-card .post-meta i {
            margin-right: 4px;
            font-size: 0.75rem;
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            background: var(--bg);
            border-radius: var(--radius);
            color: var(--text-light);
            font-size: 1rem;
        }
        .posts-empty i {
            font-size: 2.4rem;
            color: var(--border);
            margin-bottom: 16px;
            display: block;
        }

        /* ===== Process / 使用流程 ===== */
        .process-section {
            background: var(--bg);
        }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .process-step {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            transition: all var(--transition);
            position: relative;
        }
        .process-step:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 auto 16px auto;
        }
        .process-step h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--primary);
        }
        .process-step p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.5;
        }
        .process-step .step-arrow {
            position: absolute;
            right: -16px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.4rem;
            color: var(--accent);
            opacity: 0.3;
        }
        .process-step:last-child .step-arrow {
            display: none;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-white);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
            box-shadow: 0 2px 12px rgba(45, 127, 249, 0.08);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--primary);
            cursor: pointer;
            background: transparent;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            background: var(--accent-light);
        }
        .faq-question i {
            font-size: 1.2rem;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px 24px;
            font-size: 0.95rem;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.4rem;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(241, 245, 249, 0.7);
            max-width: 560px;
            margin: 0 auto 32px auto;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 44px;
            background: linear-gradient(135deg, var(--accent), var(--cyan));
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1.1rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-accent);
            border: none;
        }
        .btn-cta:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 14px 40px rgba(45, 127, 249, 0.5);
            color: #fff;
        }
        .btn-cta-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 44px;
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1.05rem;
            transition: all var(--transition);
        }
        .btn-cta-outline:hover {
            border-color: var(--accent);
            background: rgba(45, 127, 249, 0.15);
            color: #fff;
            transform: translateY(-3px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary);
            color: rgba(241, 245, 249, 0.7);
            padding: 48px 0 96px 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        .footer-brand .site-logo {
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand .site-logo span {
            -webkit-text-fill-color: #fff;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            color: #fff;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: rgba(241, 245, 249, 0.6);
            padding: 4px 0;
            transition: all var(--transition);
        }
        .footer-col a:hover {
            color: var(--cyan);
            padding-left: 4px;
        }
        .footer-col a i {
            margin-right: 8px;
            font-size: 0.8rem;
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            text-align: center;
            font-size: 0.85rem;
            color: rgba(241, 245, 249, 0.4);
        }
        .footer-bottom a {
            color: rgba(241, 245, 249, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--cyan);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-step .step-arrow {
                display: none;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing: 56px;
            }
            body {
                padding-top: 64px;
                padding-bottom: 64px;
            }
            .site-header {
                height: 64px;
            }
            .header-inner {
                height: 64px;
                padding: 0 16px;
            }
            .site-logo {
                font-size: 1.25rem;
            }
            .site-logo i {
                font-size: 1.4rem;
            }
            .nav-list {
                gap: 4px;
            }
            .nav-list a {
                padding: 6px 12px;
                font-size: 0.85rem;
            }
            .nav-list a span {
                display: none;
            }
            .nav-cta {
                padding: 8px 16px;
                font-size: 0.85rem;
            }
            .nav-cta span {
                display: none;
            }
            .mobile-bottom-nav {
                display: block;
            }
            .hero {
                padding: 72px 0 56px;
                min-height: auto;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
                margin-bottom: 28px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-stats {
                gap: 24px;
                margin-top: 32px;
                padding-top: 24px;
            }
            .hero-stat .num {
                font-size: 1.5rem;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .category-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .posts-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .post-card {
                flex-direction: column;
                padding: 16px;
            }
            .post-card .post-thumb {
                width: 100%;
                height: 160px;
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .process-step {
                padding: 24px 16px;
            }
            .process-step .step-num {
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .btn-cta,
            .btn-cta-outline {
                padding: 14px 32px;
                font-size: 1rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                text-align: center;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .site-footer {
                padding: 40px 0 80px 0;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px 14px 18px;
                font-size: 0.9rem;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero p {
                font-size: 0.92rem;
            }
            .hero-badge {
                font-size: 0.75rem;
                padding: 4px 14px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .process-step h4 {
                font-size: 0.95rem;
            }
            .process-step p {
                font-size: 0.82rem;
            }
            .post-card .post-thumb {
                height: 120px;
            }
            .post-card h4 {
                font-size: 0.95rem;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .feature-card .icon {
                width: 52px;
                height: 52px;
                font-size: 1.4rem;
            }
            .category-card .card-img {
                height: 160px;
            }
            .category-card .card-body {
                padding: 18px 20px 22px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 12px 28px;
                font-size: 0.95rem;
                width: 100%;
                justify-content: center;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                max-width: 300px;
            }
            .cta-actions .btn-cta,
            .cta-actions .btn-cta-outline {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
        }

        /* ===== Focus visible ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-light);
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --clr-primary: #6C3DFF;
            --clr-primary-dark: #5228D6;
            --clr-primary-light: #8B6BFF;
            --clr-accent: #FF6B35;
            --clr-accent-light: #FF8A5C;
            --clr-bg: #0D0B1A;
            --clr-bg-alt: #141126;
            --clr-bg-card: #1A1633;
            --clr-bg-card-hover: #221E40;
            --clr-text: #F0EEF8;
            --clr-text-muted: #9894B8;
            --clr-text-light: #C8C4E0;
            --clr-border: rgba(108, 61, 255, 0.2);
            --clr-border-hover: rgba(108, 61, 255, 0.45);
            --clr-glow: rgba(108, 61, 255, 0.15);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 16px 56px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 40px rgba(108, 61, 255, 0.10);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --spacing-section: 5rem;
            --spacing-block: 3rem;
        }

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

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

        body {
            font-family: var(--font-sans);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            font-size: 1rem;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-h);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

        a {
            color: var(--clr-primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #fff;
        }
        a:focus-visible {
            outline: 2px solid var(--clr-primary-light);
            outline-offset: 4px;
            border-radius: 4px;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
            background: transparent;
            color: inherit;
        }
        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(13, 11, 26, 0.85);
            backdrop-filter: blur(20px) saturate(1.2);
            -webkit-backdrop-filter: blur(20px) saturate(1.2);
            border-bottom: 1px solid var(--clr-border);
            height: var(--header-h);
            transition: background var(--transition), border-color var(--transition);
        }

        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 1rem;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff !important;
            letter-spacing: -0.5px;
            transition: opacity var(--transition);
            flex-shrink: 0;
        }
        .site-logo i {
            font-size: 1.6rem;
            color: var(--clr-primary-light);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .site-logo:hover {
            opacity: 0.85;
        }
        .site-logo:focus-visible {
            outline: 2px solid var(--clr-primary-light);
            outline-offset: 4px;
            border-radius: 4px;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--clr-text-muted);
            transition: background var(--transition), color var(--transition), transform var(--transition);
            white-space: nowrap;
        }
        .nav-list a i {
            font-size: 1rem;
            transition: transform var(--transition);
        }
        .nav-list a:hover {
            background: rgba(108, 61, 255, 0.10);
            color: #fff;
            transform: translateY(-1px);
        }
        .nav-list a:hover i {
            transform: scale(1.1);
        }
        .nav-list a.active {
            background: rgba(108, 61, 255, 0.18);
            color: #fff;
            box-shadow: 0 0 20px rgba(108, 61, 255, 0.08);
        }
        .nav-list a.active i {
            color: var(--clr-primary-light);
        }
        .nav-list a.nav-cta {
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dark));
            color: #fff;
            padding: 0.5rem 1.25rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            box-shadow: 0 4px 20px rgba(108, 61, 255, 0.25);
            margin-left: 0.5rem;
        }
        .nav-list a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(108, 61, 255, 0.35);
            background: linear-gradient(135deg, var(--clr-primary-light), var(--clr-primary));
        }
        .nav-list a.nav-cta i {
            color: #fff;
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1100;
            background: rgba(13, 11, 26, 0.95);
            backdrop-filter: blur(20px) saturate(1.2);
            -webkit-backdrop-filter: blur(20px) saturate(1.2);
            border-top: 1px solid var(--clr-border);
            padding: 0.4rem 0 env(safe-area-inset-bottom, 0.4rem) 0;
            justify-content: space-around;
            align-items: center;
        }
        .mobile-bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.15rem;
            padding: 0.35rem 0.6rem;
            border-radius: var(--radius-sm);
            color: var(--clr-text-muted);
            font-size: 0.65rem;
            font-weight: 500;
            transition: color var(--transition), background var(--transition);
            min-width: 56px;
            text-align: center;
        }
        .mobile-bottom-tab a i {
            font-size: 1.2rem;
            transition: transform var(--transition);
        }
        .mobile-bottom-tab a:hover {
            color: #fff;
            background: rgba(108, 61, 255, 0.08);
        }
        .mobile-bottom-tab a.active {
            color: var(--clr-primary-light);
        }
        .mobile-bottom-tab a.active i {
            transform: scale(1.1);
        }
        .mobile-bottom-tab a.nav-cta-mobile {
            color: var(--clr-accent);
        }
        .mobile-bottom-tab a.nav-cta-mobile i {
            color: var(--clr-accent);
        }

        /* ===== Hero / Banner (内页横条) ===== */
        .page-banner {
            position: relative;
            padding: 4rem 0 5rem;
            overflow: hidden;
            background: var(--clr-bg-alt);
            border-bottom: 1px solid var(--clr-border);
        }
        .page-banner .banner-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
            z-index: 0;
        }
        .page-banner .banner-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(108, 61, 255, 0.08), transparent 70%);
            z-index: 1;
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -1px;
            background: linear-gradient(135deg, #fff, var(--clr-primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 1rem;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: var(--clr-text-light);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.8;
        }
        .page-banner .banner-breadcrumb {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            align-items: center;
            margin-bottom: 1.5rem;
            font-size: 0.9rem;
            color: var(--clr-text-muted);
        }
        .page-banner .banner-breadcrumb a {
            color: var(--clr-text-muted);
        }
        .page-banner .banner-breadcrumb a:hover {
            color: #fff;
        }
        .page-banner .banner-breadcrumb .sep {
            color: var(--clr-text-muted);
            opacity: 0.4;
        }
        .page-banner .banner-breadcrumb .current {
            color: var(--clr-primary-light);
        }

        /* ===== Sections Shared ===== */
        section {
            padding: var(--spacing-section) 0;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            text-align: center;
            margin-bottom: 0.75rem;
            color: #fff;
        }
        .section-subtitle {
            text-align: center;
            color: var(--clr-text-muted);
            font-size: 1.05rem;
            max-width: 640px;
            margin: 0 auto 3rem;
            line-height: 1.8;
        }

        .section-divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--clr-primary), var(--clr-primary-light));
            border-radius: 4px;
            margin: 0 auto 1.5rem;
        }

        .text-center {
            text-align: center;
        }

        /* ===== Cards (通用) ===== */
        .card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            padding: 2rem;
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            border-color: var(--clr-border-hover);
            background: var(--clr-bg-card-hover);
        }
        .card .card-icon {
            font-size: 2.2rem;
            color: var(--clr-primary-light);
            margin-bottom: 1.2rem;
            display: inline-block;
            background: rgba(108, 61, 255, 0.10);
            padding: 0.8rem;
            border-radius: var(--radius-sm);
            line-height: 1;
        }
        .card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.6rem;
            color: #fff;
        }
        .card p {
            color: var(--clr-text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            padding: 0.2rem 0.7rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 500;
            background: rgba(108, 61, 255, 0.15);
            color: var(--clr-primary-light);
            margin-top: 0.8rem;
        }

        /* ===== Guide Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 2rem;
        }
        .step-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            padding: 2rem 1.8rem;
            border: 1px solid var(--clr-border);
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            border-color: var(--clr-border-hover);
        }
        .step-card .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dark));
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }
        .step-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.5rem;
        }
        .step-card p {
            color: var(--clr-text-light);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* ===== Feature Grid (平台功能) ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
        }
        .feature-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            padding: 2rem;
            border: 1px solid var(--clr-border);
            display: flex;
            gap: 1.2rem;
            align-items: flex-start;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
            border-color: var(--clr-border-hover);
        }
        .feature-card .fc-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(108, 61, 255, 0.10);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--clr-primary-light);
        }
        .feature-card .fc-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.3rem;
        }
        .feature-card .fc-body p {
            color: var(--clr-text-light);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* ===== Content List (资讯/文章列表) ===== */
        .content-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
        }
        .content-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            display: flex;
            flex-direction: column;
        }
        .content-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
            border-color: var(--clr-border-hover);
        }
        .content-item .ci-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .content-item .ci-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .content-item .ci-body .ci-tag {
            display: inline-block;
            padding: 0.15rem 0.6rem;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 500;
            background: rgba(108, 61, 255, 0.15);
            color: var(--clr-primary-light);
            margin-bottom: 0.5rem;
            align-self: flex-start;
        }
        .content-item .ci-body h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 0.4rem;
            line-height: 1.4;
        }
        .content-item .ci-body p {
            color: var(--clr-text-light);
            font-size: 0.9rem;
            line-height: 1.7;
            flex: 1;
        }
        .content-item .ci-body .ci-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 1rem;
            font-size: 0.8rem;
            color: var(--clr-text-muted);
            border-top: 1px solid var(--clr-border);
            padding-top: 0.8rem;
        }
        .content-item .ci-body .ci-meta a {
            color: var(--clr-primary-light);
            font-weight: 500;
        }
        .content-item .ci-body .ci-meta a:hover {
            color: #fff;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .faq-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-border-hover);
            box-shadow: var(--shadow-glow);
        }
        .faq-item summary {
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            color: #fff;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            list-style: none;
            transition: background var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::before {
            content: '\f059';
            font-family: 'Font Awesome 6 Free';
            font-weight: 400;
            color: var(--clr-primary-light);
            font-size: 1.1rem;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            margin-left: auto;
            color: var(--clr-text-muted);
            transition: transform var(--transition);
            font-size: 0.8rem;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            padding: 0 1.5rem 1.2rem 2.8rem;
            color: var(--clr-text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(108, 61, 255, 0.06), rgba(255, 107, 53, 0.04));
            border-top: 1px solid var(--clr-border);
            border-bottom: 1px solid var(--clr-border);
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            color: var(--clr-text-light);
            max-width: 560px;
            margin: 0 auto 2rem;
            font-size: 1.05rem;
            line-height: 1.8;
        }
        .cta-buttons {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.85rem 2rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dark));
            color: #fff;
            box-shadow: 0 4px 24px rgba(108, 61, 255, 0.3);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 36px rgba(108, 61, 255, 0.4);
            color: #fff;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.85rem 2rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            background: transparent;
            color: var(--clr-text-light);
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), border-color var(--transition), color var(--transition), background var(--transition);
        }
        .btn-secondary:hover {
            transform: translateY(-2px);
            border-color: var(--clr-primary-light);
            color: #fff;
            background: rgba(108, 61, 255, 0.06);
        }

        /* ===== Stats / 数据块 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.5rem;
            text-align: center;
        }
        .stat-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            padding: 1.8rem 1.5rem;
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), border-color var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-3px);
            border-color: var(--clr-border-hover);
        }
        .stat-item .stat-num {
            font-size: 2.4rem;
            font-weight: 800;
            background: linear-gradient(135deg, #fff, var(--clr-primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-item .stat-label {
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            margin-top: 0.3rem;
        }

        /* ===== Footer (共享) ===== */
        .site-footer {
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            padding: 4rem 0 2rem;
            margin-bottom: 68px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand .site-logo {
            font-size: 1.3rem;
            margin-bottom: 0.8rem;
            display: inline-flex;
        }
        .footer-brand p {
            color: var(--clr-text-muted);
            font-size: 0.9rem;
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1rem;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--clr-text-muted);
            font-size: 0.88rem;
            padding: 0.3rem 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a i {
            font-size: 0.7rem;
            color: var(--clr-primary-light);
            width: 16px;
            text-align: center;
        }
        .footer-col a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--clr-border);
            padding-top: 1.5rem;
            text-align: center;
            color: var(--clr-text-muted);
            font-size: 0.85rem;
        }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: 80px;
            right: 1.5rem;
            z-index: 900;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--clr-bg-card);
            border: 1px solid var(--clr-border);
            color: var(--clr-text-muted);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: var(--shadow-sm);
            opacity: 0;
            pointer-events: none;
            transform: translateY(12px);
        }
        .back-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .back-top:hover {
            background: var(--clr-primary);
            color: #fff;
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(108, 61, 255, 0.3);
        }

        /* ===== Responsive ===== */
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .page-banner h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 3.5rem;
                --header-h: 62px;
            }
            .nav-list a span {
                display: none;
            }
            .nav-list a {
                padding: 0.5rem 0.75rem;
            }
            .nav-list a i {
                font-size: 1.1rem;
            }
            .nav-list a.nav-cta span {
                display: inline;
            }
            .mobile-bottom-tab {
                display: flex;
            }
            .site-footer {
                margin-bottom: 62px;
            }
            .page-banner {
                padding: 3rem 0 3.5rem;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .page-banner p {
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 2rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .content-list {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .btn-primary,
            .btn-secondary {
                padding: 0.7rem 1.5rem;
                font-size: 0.9rem;
            }
            .back-top {
                bottom: 72px;
                right: 1rem;
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
            .faq-item summary {
                padding: 1rem 1.2rem;
                font-size: 0.92rem;
            }
            .faq-item .faq-answer {
                padding: 0 1.2rem 1rem 2.4rem;
                font-size: 0.88rem;
            }
        }

        @media (max-width: 520px) {
            :root {
                --spacing-section: 2.8rem;
                --header-h: 56px;
            }
            .container {
                padding: 0 1rem;
            }
            .header-inner {
                padding: 0 1rem;
            }
            .site-logo {
                font-size: 1.1rem;
            }
            .site-logo i {
                font-size: 1.3rem;
            }
            .nav-list a {
                padding: 0.4rem 0.5rem;
            }
            .nav-list a.nav-cta {
                padding: 0.4rem 0.8rem;
                font-size: 0.8rem;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner p {
                font-size: 0.9rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .section-subtitle {
                font-size: 0.88rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            .stat-item .stat-num {
                font-size: 1.8rem;
            }
            .feature-card {
                flex-direction: column;
                padding: 1.5rem;
            }
            .feature-card .fc-icon {
                width: 40px;
                height: 40px;
                font-size: 1.2rem;
            }
            .card {
                padding: 1.5rem;
            }
            .content-item .ci-img {
                height: 140px;
            }
            .mobile-bottom-tab a {
                font-size: 0.6rem;
                min-width: 48px;
                padding: 0.25rem 0.4rem;
            }
            .mobile-bottom-tab a i {
                font-size: 1.05rem;
            }
            .site-footer {
                padding: 2.5rem 0 1.5rem;
                margin-bottom: 56px;
            }
            .footer-brand p {
                font-size: 0.85rem;
            }
            .back-top {
                bottom: 66px;
                width: 36px;
                height: 36px;
                font-size: 0.9rem;
            }
        }

        @media (min-width: 769px) {
            .mobile-bottom-tab {
                display: none !important;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--clr-bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--clr-border);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--clr-border-hover);
        }

        /* ===== Selection ===== */
        ::selection {
            background: var(--clr-primary);
            color: #fff;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
    :root {
        --primary: #1a1a2e;
        --primary-light: #16213e;
        --accent: #e94560;
        --accent-hover: #d63851;
        --accent-secondary: #0f3460;
        --accent-glow: rgba(233, 69, 96, 0.25);
        --bg: #F5F7FA;
        --bg-card: #FFFFFF;
        --bg-dark: #0f0c29;
        --text: #1A1A2E;
        --text-light: #6B7280;
        --text-white: #FFFFFF;
        --border: #E5E7EB;
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow: 0 4px 20px rgba(0,0,0,0.08);
        --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
        --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.15);
        --transition: 0.3s ease;
        --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
        --container-max: 1200px;
        --header-height: 72px;
        --footer-bg: #0f0c29;
    }

    /* ===== 基础 Reset ===== */
    *, *::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);
        background: var(--bg);
        padding-top: var(--header-height);
        min-height: 100vh;
    }
    a { color: inherit; text-decoration: none; transition: color var(--transition); }
    a:hover { color: var(--accent); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    button, input, textarea { font-family: inherit; font-size: 1rem; outline: none; border: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
    p { margin-bottom: 1rem; }
    strong { font-weight: 700; }

    /* ===== 容器 ===== */
    .container {
        max-width: var(--container-max);
        margin: 0 auto;
        padding: 0 20px;
    }
    .container-narrow {
        max-width: 820px;
        margin: 0 auto;
        padding: 0 20px;
    }
    .section-padding { padding: 80px 0; }
    .section-title {
        font-size: 2rem;
        font-weight: 800;
        text-align: center;
        margin-bottom: 12px;
        color: var(--text);
    }
    .section-subtitle {
        font-size: 1.1rem;
        color: var(--text-light);
        text-align: center;
        max-width: 640px;
        margin: 0 auto 48px auto;
        line-height: 1.6;
    }
    .text-center { text-align: center; }

    /* ===== 按钮 ===== */
    .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 12px 28px;
        border-radius: 50px;
        font-weight: 600;
        font-size: 1rem;
        cursor: pointer;
        transition: all var(--transition);
        border: 2px solid transparent;
        background: var(--accent);
        color: var(--text-white);
        box-shadow: 0 4px 14px var(--accent-glow);
    }
    .btn:hover {
        background: var(--accent-hover);
        color: var(--text-white);
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(233, 69, 96, 0.3);
    }
    .btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
    .btn-outline {
        background: transparent;
        border-color: var(--accent);
        color: var(--accent);
        box-shadow: none;
    }
    .btn-outline:hover {
        background: var(--accent);
        color: var(--text-white);
        box-shadow: 0 4px 14px var(--accent-glow);
    }
    .btn-secondary {
        background: var(--accent-secondary);
        box-shadow: 0 4px 14px rgba(15, 52, 96, 0.25);
    }
    .btn-secondary:hover {
        background: #0b2a4a;
        box-shadow: 0 8px 24px rgba(15, 52, 96, 0.35);
    }
    .btn-lg { padding: 16px 40px; font-size: 1.15rem; }
    .btn-sm { padding: 8px 20px; font-size: 0.875rem; }

    /* ===== 标签 / 徽章 ===== */
    .badge {
        display: inline-block;
        padding: 4px 14px;
        border-radius: 50px;
        font-size: 0.8rem;
        font-weight: 600;
        background: var(--accent);
        color: var(--text-white);
        letter-spacing: 0.3px;
    }
    .badge-secondary {
        background: var(--accent-secondary);
        color: var(--text-white);
    }
    .badge-outline {
        background: transparent;
        border: 1.5px solid var(--accent);
        color: var(--accent);
    }
    .badge-light {
        background: rgba(233, 69, 96, 0.1);
        color: var(--accent);
    }
    .tag {
        display: inline-block;
        padding: 4px 12px;
        border-radius: 6px;
        font-size: 0.8rem;
        font-weight: 500;
        background: var(--bg);
        color: var(--text-light);
        border: 1px solid var(--border);
        transition: all var(--transition);
        margin: 3px;
    }
    .tag:hover {
        background: var(--accent);
        color: var(--text-white);
        border-color: var(--accent);
    }

    /* ===== 卡片 ===== */
    .card {
        background: var(--bg-card);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        overflow: hidden;
        transition: all var(--transition);
        border: 1px solid var(--border);
    }
    .card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
    }
    .card-img {
        width: 100%;
        aspect-ratio: 16 / 9;
        object-fit: cover;
        border-radius: var(--radius) var(--radius) 0 0;
    }
    .card-body { padding: 20px 24px 24px; }
    .card-title {
        font-size: 1.15rem;
        font-weight: 700;
        margin-bottom: 8px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .card-text {
        color: var(--text-light);
        font-size: 0.95rem;
        line-height: 1.6;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
        margin-bottom: 12px;
    }
    .card-meta {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.85rem;
        color: var(--text-light);
        flex-wrap: wrap;
    }
    .card-meta i { margin-right: 4px; }

    /* ===== 头部 & 导航 ===== */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: var(--header-height);
        background: rgba(26, 26, 46, 0.95);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid rgba(255,255,255,0.06);
        z-index: 1000;
        transition: background var(--transition);
    }
    .header-inner {
        max-width: var(--container-max);
        margin: 0 auto;
        padding: 0 20px;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    .site-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 1.4rem;
        font-weight: 800;
        color: var(--text-white);
        letter-spacing: -0.5px;
        transition: opacity var(--transition);
    }
    .site-logo i { color: var(--accent); font-size: 1.7rem; }
    .site-logo:hover { opacity: 0.9; color: var(--text-white); }
    .nav-list {
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .nav-list a {
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 8px 18px;
        border-radius: 50px;
        font-size: 0.95rem;
        font-weight: 500;
        color: rgba(255,255,255,0.75);
        transition: all var(--transition);
        white-space: nowrap;
    }
    .nav-list a i { font-size: 0.9rem; }
    .nav-list a:hover {
        color: var(--text-white);
        background: rgba(255,255,255,0.08);
    }
    .nav-list a.active {
        color: var(--text-white);
        background: var(--accent);
        box-shadow: 0 4px 14px var(--accent-glow);
    }
    .nav-list a.active:hover { background: var(--accent-hover); }
    .nav-list a.nav-cta {
        background: var(--accent);
        color: var(--text-white);
        font-weight: 700;
        box-shadow: 0 4px 14px var(--accent-glow);
        padding: 8px 24px;
    }
    .nav-list a.nav-cta:hover {
        background: var(--accent-hover);
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(233, 69, 96, 0.3);
    }

    /* ===== 移动端底部 Tab ===== */
    .mobile-tabbar {
        display: none;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 68px;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-top: 1px solid rgba(255,255,255,0.06);
        z-index: 999;
        justify-content: space-around;
        align-items: center;
        padding: 0 8px;
        padding-bottom: env(safe-area-inset-bottom, 0);
    }
    .mobile-tabbar a {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
        padding: 6px 12px;
        border-radius: 12px;
        font-size: 0.7rem;
        font-weight: 500;
        color: rgba(255,255,255,0.5);
        transition: all var(--transition);
        min-width: 56px;
    }
    .mobile-tabbar a i { font-size: 1.3rem; }
    .mobile-tabbar a:hover { color: rgba(255,255,255,0.8); }
    .mobile-tabbar a.active {
        color: var(--accent);
    }
    .mobile-tabbar a.active i { text-shadow: 0 0 20px var(--accent-glow); }
    .mobile-tabbar a.tab-cta {
        color: var(--accent);
    }
    .mobile-tabbar a.tab-cta i {
        background: var(--accent);
        color: #fff;
        padding: 8px;
        border-radius: 50%;
        font-size: 1.1rem;
        width: 36px;
        height: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 14px var(--accent-glow);
        margin-bottom: 2px;
    }

    /* ===== 文章 Banner ===== */
    .article-banner {
        position: relative;
        padding: 100px 0 80px;
        background: var(--bg-dark);
        background-image: url('/assets/images/backpic/back-1.png');
        background-size: cover;
        background-position: center;
        background-attachment: fixed;
        min-height: 360px;
        display: flex;
        align-items: center;
    }
    .article-banner::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(15,12,41,0.88) 0%, rgba(26,26,46,0.75) 50%, rgba(15,52,96,0.7) 100%);
        z-index: 1;
    }
    .article-banner .container-narrow {
        position: relative;
        z-index: 2;
        text-align: center;
    }
    .article-banner .badge {
        margin-bottom: 16px;
    }
    .article-banner h1 {
        font-size: 2.6rem;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 16px;
        line-height: 1.25;
        text-shadow: 0 2px 20px rgba(0,0,0,0.3);
    }
    .article-meta {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 20px;
        flex-wrap: wrap;
        color: rgba(255,255,255,0.7);
        font-size: 0.95rem;
    }
    .article-meta i { margin-right: 6px; color: var(--accent); }
    .article-meta span { display: flex; align-items: center; }

    /* ===== 面包屑 ===== */
    .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 16px 0;
        font-size: 0.9rem;
        color: var(--text-light);
        flex-wrap: wrap;
    }
    .breadcrumb a { color: var(--text-light); }
    .breadcrumb a:hover { color: var(--accent); }
    .breadcrumb i { font-size: 0.7rem; color: var(--text-light); }
    .breadcrumb .current { color: var(--text); font-weight: 600; }

    /* ===== 正文区域 ===== */
    .article-content-wrap {
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow);
        padding: 48px 56px;
        margin-top: -40px;
        position: relative;
        z-index: 3;
        border: 1px solid var(--border);
    }
    .article-content {
        font-size: 1.05rem;
        line-height: 1.9;
        color: var(--text);
    }
    .article-content h2 {
        font-size: 1.6rem;
        margin: 36px 0 16px;
        padding-bottom: 8px;
        border-bottom: 2px solid var(--border);
    }
    .article-content h3 {
        font-size: 1.25rem;
        margin: 28px 0 12px;
    }
    .article-content p { margin-bottom: 1.2rem; }
    .article-content ul, .article-content ol {
        margin: 16px 0;
        padding-left: 24px;
    }
    .article-content ul li {
        list-style: disc;
        margin-bottom: 8px;
    }
    .article-content ol li {
        list-style: decimal;
        margin-bottom: 8px;
    }
    .article-content img {
        border-radius: var(--radius);
        margin: 24px auto;
        box-shadow: var(--shadow);
    }
    .article-content blockquote {
        border-left: 4px solid var(--accent);
        padding: 16px 24px;
        margin: 24px 0;
        background: rgba(233,69,96,0.04);
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--text-light);
        font-style: italic;
    }
    .article-content a {
        color: var(--accent);
        text-decoration: underline;
        text-underline-offset: 3px;
    }
    .article-content a:hover { color: var(--accent-hover); }
    .article-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 32px;
        padding-top: 24px;
        border-top: 1px solid var(--border);
    }
    .article-share {
        display: flex;
        align-items: center;
        gap: 12px;
        margin-top: 20px;
        padding-top: 20px;
        border-top: 1px solid var(--border);
    }
    .article-share span { font-weight: 600; color: var(--text-light); }
    .article-share a {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: var(--bg);
        color: var(--text-light);
        border: 1px solid var(--border);
        transition: all var(--transition);
    }
    .article-share a:hover {
        background: var(--accent);
        color: var(--text-white);
        border-color: var(--accent);
        transform: translateY(-2px);
    }

    /* ===== 文章未找到 ===== */
    .not-found-wrap {
        text-align: center;
        padding: 80px 20px;
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow);
        margin-top: -40px;
        position: relative;
        z-index: 3;
    }
    .not-found-wrap i {
        font-size: 4rem;
        color: var(--text-light);
        margin-bottom: 20px;
        opacity: 0.5;
    }
    .not-found-wrap h2 {
        font-size: 1.8rem;
        margin-bottom: 12px;
    }
    .not-found-wrap p {
        color: var(--text-light);
        margin-bottom: 24px;
    }

    /* ===== 相关文章 ===== */
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .related-card .card-img { aspect-ratio: 16 / 10; }
    .related-card .card-title { font-size: 1.05rem; }

    /* ===== FAQ ===== */
    .faq-list {
        max-width: 760px;
        margin: 0 auto;
    }
    .faq-item {
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px solid var(--border);
        margin-bottom: 12px;
        overflow: hidden;
        transition: all var(--transition);
    }
    .faq-item:hover { border-color: var(--accent); }
    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 24px;
        background: transparent;
        font-size: 1.05rem;
        font-weight: 600;
        color: var(--text);
        cursor: pointer;
        text-align: left;
        gap: 16px;
        transition: background var(--transition);
    }
    .faq-question:hover { background: rgba(233,69,96,0.03); }
    .faq-question i { color: var(--accent); transition: transform var(--transition); font-size: 0.9rem; }
    .faq-question.active i { transform: rotate(180deg); }
    .faq-answer {
        padding: 0 24px 18px;
        color: var(--text-light);
        line-height: 1.7;
        font-size: 0.95rem;
        display: none;
    }
    .faq-answer.show { display: block; }

    /* ===== CTA ===== */
    .cta-section {
        background: var(--bg-dark);
        background-image: url('/assets/images/backpic/back-2.png');
        background-size: cover;
        background-position: center;
        position: relative;
        padding: 80px 0;
    }
    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, rgba(15,12,41,0.9) 0%, rgba(26,26,46,0.8) 100%);
        z-index: 1;
    }
    .cta-section .container { position: relative; z-index: 2; text-align: center; }
    .cta-section h2 {
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 12px;
    }
    .cta-section p {
        color: rgba(255,255,255,0.7);
        font-size: 1.1rem;
        max-width: 560px;
        margin: 0 auto 32px;
    }
    .cta-section .btn-group {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 16px;
        flex-wrap: wrap;
    }

    /* ===== 页脚 ===== */
    .site-footer {
        background: var(--footer-bg);
        color: rgba(255,255,255,0.7);
        padding: 60px 0 30px;
        border-top: 1px solid rgba(255,255,255,0.05);
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
        gap: 40px;
        margin-bottom: 40px;
    }
    .footer-brand .site-logo { font-size: 1.3rem; margin-bottom: 12px; }
    .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.55); max-width: 320px; }
    .footer-col h4 {
        font-size: 1rem;
        font-weight: 700;
        color: var(--text-white);
        margin-bottom: 16px;
        letter-spacing: 0.5px;
    }
    .footer-col a {
        display: flex;
        align-items: center;
        gap: 8px;
        color: rgba(255,255,255,0.55);
        font-size: 0.9rem;
        padding: 4px 0;
        transition: all var(--transition);
    }
    .footer-col a i { font-size: 0.7rem; color: var(--accent); }
    .footer-col a:hover { color: var(--text-white); padding-left: 4px; }
    .footer-bottom {
        border-top: 1px solid rgba(255,255,255,0.06);
        padding-top: 24px;
        text-align: center;
        font-size: 0.85rem;
        color: rgba(255,255,255,0.4);
    }
    .footer-bottom p { margin-bottom: 0; }

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        .article-content-wrap { padding: 36px 32px; }
        .article-banner h1 { font-size: 2.2rem; }
        .related-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
        :root { --header-height: 64px; }
        .section-padding { padding: 56px 0; }
        .section-title { font-size: 1.6rem; }
        .section-subtitle { font-size: 1rem; margin-bottom: 32px; }
        .nav-list { gap: 4px; }
        .nav-list a { padding: 6px 14px; font-size: 0.85rem; }
        .nav-list a.nav-cta { padding: 6px 18px; }
        .site-logo { font-size: 1.2rem; }
        .site-logo i { font-size: 1.4rem; }
        .mobile-tabbar { display: flex; }
        body { padding-bottom: 72px; }
        .article-banner { padding: 80px 0 60px; min-height: 280px; }
        .article-banner h1 { font-size: 1.8rem; }
        .article-meta { gap: 12px; font-size: 0.85rem; }
        .article-content-wrap { padding: 28px 20px; margin-top: -20px; border-radius: var(--radius); }
        .article-content { font-size: 1rem; }
        .article-content h2 { font-size: 1.35rem; }
        .related-grid { grid-template-columns: 1fr; gap: 16px; }
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .footer-brand p { max-width: 100%; }
        .cta-section h2 { font-size: 1.6rem; }
        .cta-section p { font-size: 1rem; }
        .not-found-wrap { padding: 48px 20px; }
        .not-found-wrap i { font-size: 3rem; }
        .breadcrumb { font-size: 0.8rem; }
    }

    @media (max-width: 520px) {
        .nav-list a span { display: none; }
        .nav-list a { padding: 8px 12px; }
        .nav-list a i { font-size: 1.1rem; }
        .nav-list a.nav-cta span { display: inline; }
        .article-banner { padding: 60px 0 40px; min-height: 220px; }
        .article-banner h1 { font-size: 1.4rem; }
        .article-content-wrap { padding: 20px 16px; }
        .section-title { font-size: 1.4rem; }
        .faq-question { padding: 14px 16px; font-size: 0.95rem; }
        .btn-lg { padding: 14px 32px; font-size: 1rem; }
        .cta-section { padding: 56px 0; }
        .mobile-tabbar { height: 60px; }
        .mobile-tabbar a { font-size: 0.6rem; min-width: 48px; }
        .mobile-tabbar a i { font-size: 1.1rem; }
        .mobile-tabbar a.tab-cta i { width: 30px; height: 30px; font-size: 0.95rem; padding: 6px; }
    }

    @media (min-width: 769px) {
        .mobile-tabbar { display: none !important; }
        body { padding-bottom: 0; }
    }

    /* ===== 动画 ===== */
    @keyframes fadeUp {
        from { opacity: 0; transform: translateY(24px); }
        to { opacity: 1; transform: translateY(0); }
    }
    .fade-up { animation: fadeUp 0.6s ease forwards; }
    .fade-up-delay-1 { animation-delay: 0.1s; }
    .fade-up-delay-2 { animation-delay: 0.2s; }
    .fade-up-delay-3 { animation-delay: 0.3s; }

    /* ===== 工具 ===== */
    .mb-0 { margin-bottom: 0; }
    .mt-2 { margin-top: 8px; }
    .mt-4 { margin-top: 16px; }
    .gap-2 { gap: 8px; }
    .gap-4 { gap: 16px; }
    .flex-center { display: flex; align-items: center; justify-content: center; }
    .flex-wrap { flex-wrap: wrap; }
    .w-full { width: 100%; }