/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a1a2e;
            --primary-dark: #0f0f1e;
            --primary-light: #2d2b55;
            --secondary: #e94560;
            --secondary-light: #ff6b81;
            --accent: #f5c518;
            --accent-light: #ffd84d;
            --bg: #f8f9fc;
            --bg-card: #ffffff;
            --bg-dark: #0f0f1e;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 30px rgba(229, 69, 96, 0.3);
            --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
        }

        /* ===== 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;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover { color: var(--secondary); }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text); }
        h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
        h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
        h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
        h4 { font-size: 1.15rem; }
        p { margin-bottom: 0.8rem; color: var(--text-light); }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) { .container { padding: 0 16px; } }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all var(--transition);
            border: 2px solid transparent;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--secondary);
            color: #fff;
            border-color: var(--secondary);
        }
        .btn-primary:hover {
            background: var(--secondary-light);
            border-color: var(--secondary-light);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: none; }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255,255,255,0.4);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline:active { transform: translateY(0); }
        .btn-accent {
            background: var(--accent);
            color: #1a1a2e;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            color: #1a1a2e;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 197, 24, 0.35);
        }
        .btn-accent:active { transform: translateY(0); }
        .btn-lg { padding: 16px 44px; font-size: 1.05rem; border-radius: var(--radius-lg); }
        .btn-sm { padding: 8px 20px; font-size: 0.85rem; border-radius: var(--radius-sm); }
        .btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

        /* ===== 标签 / 徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: rgba(229, 69, 96, 0.12);
            color: var(--secondary);
        }
        .badge-gold {
            background: rgba(245, 197, 24, 0.15);
            color: #b8860b;
        }
        .badge-blue {
            background: rgba(59, 130, 246, 0.12);
            color: #1e40af;
        }
        .badge-green {
            background: rgba(16, 185, 129, 0.12);
            color: #047857;
        }
        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.72rem;
            font-weight: 500;
            background: var(--border);
            color: var(--text-light);
            transition: background var(--transition);
        }
        .tag:hover { background: var(--secondary); color: #fff; cursor: default; }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--primary);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            height: var(--nav-height);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(26, 26, 46, 0.96);
            box-shadow: 0 4px 30px rgba(0,0,0,0.3);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }
        .nav-logo:hover { opacity: 0.9; color: #fff; }
        .nav-logo i { color: var(--accent); font-size: 1.5rem; }
        .nav-logo span { background: linear-gradient(135deg, #fff 60%, var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

        /* 卡片化导航面板 */
        .nav-panel {
            display: flex;
            align-items: center;
            gap: 6px;
            background: rgba(255,255,255,0.06);
            padding: 4px 6px;
            border-radius: var(--radius-lg);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.08);
        }
        .nav-panel a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius);
            font-size: 0.88rem;
            font-weight: 500;
            color: rgba(255,255,255,0.7);
            transition: all var(--transition);
            position: relative;
        }
        .nav-panel a i { font-size: 0.9rem; }
        .nav-panel a:hover {
            color: #fff;
            background: rgba(255,255,255,0.1);
        }
        .nav-panel a.active {
            color: #fff;
            background: var(--secondary);
            box-shadow: 0 4px 16px rgba(229, 69, 96, 0.35);
        }
        .nav-panel a.active:hover { background: var(--secondary-light); }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-cta .btn {
            padding: 8px 24px;
            font-size: 0.88rem;
            border-radius: var(--radius);
        }

        /* 移动端菜单按钮 */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            background: rgba(255,255,255,0.08);
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255,255,255,0.1);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: rgba(255,255,255,0.14); }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: #fff;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* 移动端菜单 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: var(--primary-dark);
            padding: 20px 24px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            box-shadow: 0 20px 60px rgba(0,0,0,0.5);
            z-index: 999;
            transform: translateY(-10px);
            opacity: 0;
            transition: all 0.4s ease;
            pointer-events: none;
        }
        .mobile-menu.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            display: block;
            padding: 12px 16px;
            font-size: 1rem;
            font-weight: 500;
            color: rgba(255,255,255,0.75);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }
        .mobile-menu a:hover {
            background: rgba(255,255,255,0.08);
            color: #fff;
        }
        .mobile-menu a.active {
            color: var(--secondary);
            background: rgba(229, 69, 96, 0.12);
        }
        .mobile-menu a i { width: 24px; margin-right: 8px; }

        @media (max-width: 768px) {
            .nav-panel { display: none; }
            .nav-cta .btn { display: none; }
            .nav-toggle { display: flex; }
            .mobile-menu { display: block; }
        }
        @media (min-width: 769px) {
            .mobile-menu { display: none !important; }
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            padding: 120px 0 80px;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            mix-blend-mode: overlay;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(26,26,46,0.6) 0%, var(--primary-dark) 70%);
        }
        .hero-glow {
            position: absolute;
            top: -20%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(229,69,96,0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 20px;
            border-radius: 50px;
            background: rgba(245,197,24,0.15);
            border: 1px solid rgba(245,197,24,0.2);
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
        }
        .hero-badge i { font-size: 0.8rem; }
        .hero h1 {
            color: #fff;
            font-weight: 900;
            line-height: 1.1;
            margin-bottom: 20px;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent), #ff8c42);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.7);
            max-width: 560px;
            margin-bottom: 36px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stats .stat h3 {
            color: #fff;
            font-size: 1.8rem;
            font-weight: 800;
        }
        .hero-stats .stat h3 i {
            color: var(--accent);
            font-size: 1.4rem;
            margin-right: 6px;
        }
        .hero-stats .stat p {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
            margin: 0;
        }
        @media (max-width: 768px) {
            .hero { min-height: 80vh; padding: 100px 0 60px; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stats .stat h3 { font-size: 1.4rem; }
            .hero p { font-size: 1rem; }
        }
        @media (max-width: 520px) {
            .hero-actions { flex-direction: column; align-items: stretch; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .hero-stats { flex-direction: column; gap: 16px; }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-card);
        }
        .section-dark {
            background: var(--primary-dark);
            color: #fff;
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark .section-subtitle { color: #fff; }
        .section-dark .section-subtitle { color: rgba(255,255,255,0.6); }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }
        .section-header h2 { margin-bottom: 16px; }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-light);
            line-height: 1.7;
        }
        .section-header .badge { margin-bottom: 12px; }

        /* ===== 卡片通用 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow);
            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: 24px; }
        .card-body h3 { margin-bottom: 8px; }
        .card-body p { font-size: 0.92rem; }

        /* ===== 优势板块 ===== */
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .advantage-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .advantage-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .advantage-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.6rem;
            color: #fff;
            transition: transform var(--transition);
        }
        .advantage-card:hover .icon { transform: scale(1.1); }
        .advantage-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .advantage-card p { font-size: 0.88rem; margin: 0; }
        .icon-red { background: linear-gradient(135deg, var(--secondary), var(--secondary-light)); }
        .icon-blue { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
        .icon-gold { background: linear-gradient(135deg, var(--accent), #ff8c42); }
        .icon-green { background: linear-gradient(135deg, #10b981, #34d399); }
        @media (max-width: 1024px) {
            .advantages-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .advantages-grid { grid-template-columns: 1fr; }
        }

        /* ===== 分类入口 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            aspect-ratio: 4/3;
            display: flex;
            align-items: flex-end;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .category-card:hover img { transform: scale(1.08); }
        .category-card .overlay {
            position: relative;
            z-index: 2;
            width: 100%;
            padding: 24px;
            background: linear-gradient(transparent, rgba(0,0,0,0.75));
            color: #fff;
        }
        .category-card .overlay h3 { color: #fff; font-size: 1.15rem; margin-bottom: 4px; }
        .category-card .overlay p { color: rgba(255,255,255,0.7); font-size: 0.85rem; margin: 0; }
        .category-card .overlay .btn-sm {
            margin-top: 12px;
            background: rgba(255,255,255,0.15);
            color: #fff;
            border: 1px solid rgba(255,255,255,0.2);
        }
        .category-card .overlay .btn-sm:hover { background: var(--secondary); border-color: var(--secondary); }
        @media (max-width: 768px) {
            .category-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .category-grid { grid-template-columns: 1fr; }
        }

        /* ===== 内容 / 资讯列表 ===== */
        .content-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .content-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .content-card img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: var(--radius) var(--radius) 0 0;
        }
        .content-card .card-body { padding: 20px 24px 24px; }
        .content-card .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 10px;
        }
        .content-card .meta span { display: flex; align-items: center; gap: 4px; }
        .content-card h3 { font-size: 1.05rem; margin-bottom: 8px; transition: color var(--transition); }
        .content-card:hover h3 { color: var(--secondary); }
        .content-card p { font-size: 0.88rem; margin-bottom: 0; }
        .content-card .read-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 12px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary-light);
        }
        .content-card .read-more:hover { color: var(--secondary); gap: 10px; }
        @media (max-width: 1024px) {
            .content-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .content-grid { grid-template-columns: 1fr; }
        }

        /* ===== 流程步骤 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: linear-gradient(90deg, var(--secondary), var(--accent), var(--secondary));
            opacity: 0.3;
        }
        .step {
            text-align: center;
            position: relative;
            z-index: 2;
        }
        .step .num {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            box-shadow: 0 8px 32px rgba(229, 69, 96, 0.3);
            transition: transform var(--transition);
        }
        .step:hover .num { transform: scale(1.08); }
        .step h3 { font-size: 1.05rem; margin-bottom: 8px; }
        .step p { font-size: 0.88rem; margin: 0; }
        @media (max-width: 768px) {
            .steps { grid-template-columns: repeat(2, 1fr); gap: 32px; }
            .steps::before { display: none; }
        }
        @media (max-width: 520px) {
            .steps { grid-template-columns: 1fr; gap: 28px; }
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item { padding: 24px 16px; }
        .stat-item .num {
            font-size: 2.8rem;
            font-weight: 900;
            color: #fff;
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-item .num i { color: var(--accent); font-size: 2rem; margin-right: 6px; }
        .stat-item p {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
            margin: 0;
        }
        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-item .num { font-size: 2rem; }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--secondary); box-shadow: var(--shadow-sm); }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            background: none;
            text-align: left;
            transition: color var(--transition);
        }
        .faq-question:hover { color: var(--secondary); }
        .faq-question i {
            font-size: 0.9rem;
            color: var(--text-light);
            transition: transform 0.3s ease;
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); color: var(--secondary); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p { font-size: 0.92rem; margin: 0; color: var(--text-light); }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.1;
            mix-blend-mode: overlay;
        }
        .cta-section h2 { color: #fff; font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.7); font-size: 1.05rem; max-width: 560px; margin: 0 auto 36px; }
        .cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary-dark);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .nav-logo { margin-bottom: 12px; }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.5);
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-weight: 700;
        }
        .footer-col a {
            display: block;
            padding: 4px 0;
            font-size: 0.88rem;
            color: rgba(255,255,255,0.55);
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--accent); }
        .footer-col a i { width: 20px; margin-right: 6px; }
        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.06);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--accent); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; text-align: center; }
            .footer-brand p { max-width: 100%; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 空列表提示 ===== */
        .empty-tip {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-light);
            font-size: 1rem;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }
        .empty-tip i { font-size: 2rem; color: var(--border); margin-bottom: 12px; display: block; }

        /* ===== 滚动动画辅助 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== 响应式微调 ===== */
        @media (max-width: 1024px) {
            .section { padding: 60px 0; }
            .section-header { margin-bottom: 40px; }
        }
        @media (max-width: 768px) {
            .section { padding: 48px 0; }
            .section-header { margin-bottom: 32px; }
            .section-header h2 { font-size: 1.6rem; }
        }
        @media (max-width: 520px) {
            .section { padding: 36px 0; }
            .btn-lg { padding: 14px 32px; font-size: 0.95rem; }
        }

        /* ===== 辅助类 ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

        /* 文章空状态 */
        .not-found {
            text-align: center;
            padding: 80px 24px;
        }
        .not-found i { font-size: 3rem; color: var(--border); margin-bottom: 16px; }
        .not-found h3 { margin-bottom: 8px; }
        .not-found p { color: var(--text-light); }
        .not-found a { color: var(--secondary); font-weight: 600; }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #e74c3c;
            --primary-dark: #c0392b;
            --primary-light: #fadbd8;
            --secondary: #f39c12;
            --secondary-light: #fef5e7;
            --accent: #2ecc71;
            --bg: #f8f9fa;
            --bg-alt: #ffffff;
            --bg-dark: #1a1a2e;
            --text: #2c3e50;
            --text-light: #7f8c8d;
            --text-white: #ffffff;
            --border: #e0e0e0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.15);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            --container: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset / Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: 0 2px 30px rgba(0,0,0,0.06);
            height: var(--header-h);
            border-bottom: 1px solid rgba(0,0,0,0.04);
        }
        .nav-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--header-h); gap: 16px;
        }
        .nav-logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 800; color: var(--text); white-space: nowrap;
        }
        .nav-logo i { color: var(--primary); font-size: 1.6rem; }
        .nav-logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-logo:hover { opacity: 0.85; }
        .nav-panel {
            display: flex; align-items: center; gap: 6px;
            background: var(--bg); padding: 4px 6px; border-radius: 40px;
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.04);
        }
        .nav-panel a {
            display: flex; align-items: center; gap: 6px;
            padding: 8px 18px; border-radius: 30px;
            font-size: 0.92rem; font-weight: 500; color: var(--text-light);
            transition: var(--transition); white-space: nowrap;
        }
        .nav-panel a i { font-size: 0.85rem; }
        .nav-panel a:hover { color: var(--text); background: rgba(0,0,0,0.04); }
        .nav-panel a.active {
            background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(231,76,60,0.35);
        }
        .nav-panel a.active:hover { background: var(--primary-dark); color: #fff; }
        .nav-cta { display: flex; align-items: center; gap: 10px; }
        .nav-toggle {
            display: none; flex-direction: column; gap: 5px; background: none; border: none;
            cursor: pointer; padding: 6px; border-radius: var(--radius-sm);
        }
        .nav-toggle span {
            display: block; width: 24px; height: 2.5px; background: var(--text);
            border-radius: 4px; transition: var(--transition);
        }
        .nav-toggle:hover span { background: var(--primary); }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 12px 28px; border-radius: 40px; font-size: 0.95rem; font-weight: 600;
            border: none; cursor: pointer; transition: var(--transition);
            text-align: center; white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary); color: #fff; box-shadow: 0 6px 20px rgba(231,76,60,0.3);
        }
        .btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 10px 30px rgba(231,76,60,0.4); }
        .btn-primary:active { transform: scale(0.96); }
        .btn-secondary {
            background: var(--secondary); color: #fff; box-shadow: 0 6px 20px rgba(243,156,18,0.3);
        }
        .btn-secondary:hover { background: #e67e22; color: #fff; transform: translateY(-2px); box-shadow: 0 10px 30px rgba(243,156,18,0.4); }
        .btn-outline {
            background: transparent; color: var(--text); border: 2px solid var(--border);
        }
        .btn-outline:hover { border-color: var(--primary); color: var(--primary); background: rgba(231,76,60,0.04); transform: translateY(-2px); }
        .btn-sm { padding: 8px 20px; font-size: 0.85rem; }

        /* ===== Article Banner ===== */
        .article-banner {
            margin-top: var(--header-h);
            padding: 100px 0 80px;
            background: linear-gradient(135deg, rgba(26,26,46,0.92), rgba(44,62,80,0.88)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            position: relative;
            text-align: center;
            color: var(--text-white);
        }
        .article-banner .container { position: relative; z-index: 2; }
        .article-banner .breadcrumb {
            display: flex; align-items: center; justify-content: center; gap: 8px;
            font-size: 0.9rem; opacity: 0.8; margin-bottom: 20px; flex-wrap: wrap;
        }
        .article-banner .breadcrumb a { color: rgba(255,255,255,0.8); }
        .article-banner .breadcrumb a:hover { color: #fff; }
        .article-banner .breadcrumb span { color: rgba(255,255,255,0.6); }
        .article-banner h1 {
            font-size: 2.6rem; font-weight: 800; line-height: 1.25;
            max-width: 900px; margin: 0 auto 16px;
        }
        .article-banner .meta {
            display: flex; align-items: center; justify-content: center; gap: 24px;
            font-size: 0.95rem; opacity: 0.85; flex-wrap: wrap;
        }
        .article-banner .meta i { margin-right: 6px; }
        .article-banner .meta .badge {
            display: inline-block; padding: 4px 14px; border-radius: 30px;
            background: var(--primary); font-size: 0.8rem; font-weight: 600;
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .article-layout {
            display: grid; grid-template-columns: 1fr 300px; gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-alt); border-radius: var(--radius-lg);
            padding: 48px; box-shadow: var(--shadow);
        }
        .article-body .content {
            font-size: 1.05rem; line-height: 1.9; color: var(--text);
        }
        .article-body .content p { margin-bottom: 1.4em; }
        .article-body .content h2, 
        .article-body .content h3 { margin-top: 1.8em; margin-bottom: 0.8em; font-weight: 700; color: var(--text); }
        .article-body .content h2 { font-size: 1.6rem; border-left: 4px solid var(--primary); padding-left: 16px; }
        .article-body .content h3 { font-size: 1.25rem; }
        .article-body .content ul, 
        .article-body .content ol { padding-left: 24px; margin-bottom: 1.4em; }
        .article-body .content ul { list-style: disc; }
        .article-body .content ol { list-style: decimal; }
        .article-body .content li { margin-bottom: 0.4em; }
        .article-body .content a { color: var(--primary); text-decoration: underline; }
        .article-body .content a:hover { color: var(--primary-dark); }
        .article-body .content img { border-radius: var(--radius); margin: 1.5em 0; box-shadow: var(--shadow); }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary); background: var(--primary-light);
            padding: 16px 24px; margin: 1.5em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text); font-style: italic;
        }
        .article-body .content code {
            background: #f1f2f6; padding: 2px 10px; border-radius: 4px;
            font-size: 0.9em; color: var(--primary-dark);
        }
        .article-body .content pre {
            background: #2d3436; color: #f8f9fa; padding: 20px 24px; border-radius: var(--radius);
            overflow-x: auto; margin: 1.5em 0; font-size: 0.9rem; line-height: 1.6;
        }
        .article-body .content pre code { background: none; color: inherit; padding: 0; }
        .article-body .content table {
            width: 100%; border-collapse: collapse; margin: 1.5em 0;
        }
        .article-body .content th, 
        .article-body .content td {
            padding: 12px 16px; border: 1px solid var(--border); text-align: left;
        }
        .article-body .content th { background: var(--bg); font-weight: 600; }
        .article-body .content tr:nth-child(even) td { background: rgba(0,0,0,0.02); }

        .article-body .tags {
            display: flex; flex-wrap: wrap; gap: 10px;
            margin-top: 36px; padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-body .tags .tag {
            display: inline-block; padding: 4px 16px; border-radius: 30px;
            background: var(--bg); font-size: 0.82rem; color: var(--text-light);
            border: 1px solid var(--border); transition: var(--transition);
        }
        .article-body .tags .tag:hover { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }

        .article-body .share-bar {
            display: flex; align-items: center; gap: 12px;
            margin-top: 32px; padding-top: 20px;
            border-top: 1px solid var(--border);
        }
        .article-body .share-bar span { font-weight: 600; font-size: 0.9rem; color: var(--text-light); }
        .article-body .share-bar a {
            display: flex; align-items: center; justify-content: center;
            width: 40px; height: 40px; border-radius: 50%;
            background: var(--bg); color: var(--text-light);
            transition: var(--transition); font-size: 1rem;
        }
        .article-body .share-bar a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

        .article-body .post-nav {
            display: flex; justify-content: space-between; gap: 20px;
            margin-top: 40px; padding-top: 24px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
        }
        .article-body .post-nav a {
            display: flex; align-items: center; gap: 10px;
            font-weight: 500; color: var(--text); max-width: 45%;
        }
        .article-body .post-nav a:hover { color: var(--primary); }
        .article-body .post-nav .next { text-align: right; justify-content: flex-end; }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex; flex-direction: column; gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-alt); border-radius: var(--radius-lg);
            padding: 28px; box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 1.1rem; font-weight: 700; margin-bottom: 18px;
            padding-bottom: 12px; border-bottom: 2px solid var(--primary);
            display: flex; align-items: center; gap: 10px;
        }
        .sidebar-card h3 i { color: var(--primary); }
        .sidebar-card ul li { margin-bottom: 10px; }
        .sidebar-card ul li a {
            display: flex; align-items: center; gap: 10px;
            padding: 8px 12px; border-radius: var(--radius-sm);
            font-size: 0.92rem; color: var(--text); transition: var(--transition);
        }
        .sidebar-card ul li a i { color: var(--primary); font-size: 0.75rem; }
        .sidebar-card ul li a:hover { background: var(--bg); color: var(--primary); padding-left: 18px; }
        .sidebar-card .cta-box {
            text-align: center; padding: 12px 0;
        }
        .sidebar-card .cta-box p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 16px; }

        .sidebar-card .hot-item {
            display: flex; gap: 14px; align-items: flex-start;
            padding: 12px 0; border-bottom: 1px solid var(--border);
        }
        .sidebar-card .hot-item:last-child { border-bottom: none; padding-bottom: 0; }
        .sidebar-card .hot-item .num {
            width: 28px; height: 28px; border-radius: 50%;
            background: var(--bg); display: flex; align-items: center; justify-content: center;
            font-size: 0.8rem; font-weight: 700; color: var(--text-light); flex-shrink: 0;
        }
        .sidebar-card .hot-item .num.top { background: var(--primary); color: #fff; }
        .sidebar-card .hot-item .info { flex: 1; }
        .sidebar-card .hot-item .info a { font-size: 0.92rem; font-weight: 500; color: var(--text); display: block; }
        .sidebar-card .hot-item .info a:hover { color: var(--primary); }
        .sidebar-card .hot-item .info .date { font-size: 0.78rem; color: var(--text-light); margin-top: 2px; }

        /* ===== Not Found ===== */
        .not-found {
            text-align: center; padding: 80px 20px;
        }
        .not-found i { font-size: 4rem; color: var(--text-light); margin-bottom: 20px; }
        .not-found h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found p { color: var(--text-light); margin-bottom: 24px; }

        /* ===== CTA Section ===== */
        .article-cta {
            background: linear-gradient(135deg, var(--bg-dark), #16213e);
            padding: 64px 0; text-align: center; color: var(--text-white);
        }
        .article-cta h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
        .article-cta p { font-size: 1.05rem; opacity: 0.85; margin-bottom: 28px; max-width: 600px; margin-left: auto; margin-right: auto; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark); color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr; gap: 40px;
            padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .nav-logo { color: #fff; font-size: 1.2rem; margin-bottom: 16px; }
        .footer-brand p { font-size: 0.92rem; line-height: 1.7; max-width: 360px; }
        .footer-col h4 {
            color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 16px;
            position: relative; padding-bottom: 8px;
        }
        .footer-col h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 32px; height: 2px; background: var(--primary); }
        .footer-col a {
            display: flex; align-items: center; gap: 8px;
            color: rgba(255,255,255,0.6); font-size: 0.9rem; padding: 5px 0;
        }
        .footer-col a i { font-size: 0.65rem; }
        .footer-col a:hover { color: #fff; padding-left: 4px; }
        .footer-bottom {
            display: flex; justify-content: space-between; align-items: center;
            padding-top: 24px; font-size: 0.85rem; color: rgba(255,255,255,0.4);
            flex-wrap: wrap; gap: 12px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; gap: 32px; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .article-banner h1 { font-size: 2.2rem; }
            .article-body { padding: 32px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            .nav-panel { display: none; }
            .nav-panel.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(16px); padding: 16px 24px; border-radius: 0 0 var(--radius-lg) var(--radius-lg); box-shadow: var(--shadow-lg); gap: 8px; }
            .nav-panel.open a { width: 100%; justify-content: center; padding: 12px; }
            .nav-toggle { display: flex; }
            .nav-cta .btn { padding: 8px 16px; font-size: 0.8rem; }
            .article-banner { padding: 80px 0 60px; }
            .article-banner h1 { font-size: 1.7rem; }
            .article-banner .meta { gap: 14px; font-size: 0.85rem; }
            .article-body { padding: 24px 20px; }
            .article-body .content { font-size: 0.98rem; }
            .article-body .content h2 { font-size: 1.35rem; }
            .article-sidebar { grid-template-columns: 1fr; }
            .article-cta h2 { font-size: 1.5rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .article-body .post-nav a { max-width: 100%; }
            .article-body .post-nav { flex-direction: column; }
            .article-body .post-nav .next { text-align: left; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-banner h1 { font-size: 1.4rem; }
            .article-banner { padding: 70px 0 50px; }
            .article-body { padding: 20px 16px; border-radius: var(--radius); }
            .article-body .content { font-size: 0.95rem; }
            .article-body .content h2 { font-size: 1.2rem; padding-left: 12px; }
            .article-body .share-bar { flex-wrap: wrap; }
            .sidebar-card { padding: 20px; }
            .nav-logo { font-size: 1.1rem; }
            .nav-logo i { font-size: 1.3rem; }
            .btn-sm { padding: 6px 14px; font-size: 0.78rem; }
            .article-cta h2 { font-size: 1.3rem; }
            .article-cta { padding: 48px 0; }
            .article-cta .btn { width: 100%; justify-content: center; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1e40af;
            --primary-light: #dbeafe;
            --primary-50: #eff6ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --success: #10b981;
            --success-light: #d1fae5;
            --danger: #ef4444;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --white: #ffffff;
            --black: #000000;
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--gray-800);
            background: var(--white);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--gray-900); }
        h1 { font-size: 2.8rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.4rem; }
        h4 { font-size: 1.15rem; }
        p { margin-bottom: 0.8rem; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
            line-height: 1.4;
        }
        .btn i { font-size: 1.05em; }
        .btn-primary {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37,99,235,0.35);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: 0 4px 12px rgba(37,99,235,0.25); }
        .btn-accent {
            background: var(--accent);
            color: var(--white);
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245,158,11,0.35);
        }
        .btn-accent:active { transform: translateY(0); box-shadow: 0 4px 12px rgba(245,158,11,0.25); }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: var(--white);
            transform: translateY(-2px);
        }
        .btn-outline:active { transform: translateY(0); }
        .btn-white {
            background: var(--white);
            color: var(--primary);
            border-color: var(--white);
        }
        .btn-white:hover {
            background: var(--primary-50);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255,255,255,0.3);
        }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }
        .btn-lg { padding: 16px 36px; font-size: 1.1rem; }
        .btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary-dark);
            white-space: nowrap;
        }
        .badge-accent { background: var(--accent-light); color: var(--accent-dark); }
        .badge-success { background: var(--success-light); color: #065f46; }
        .badge i { font-size: 0.75rem; }

        /* ===== Section spacing ===== */
        .section { padding: 80px 0; }
        .section-title {
            text-align: center;
            margin-bottom: 16px;
            font-size: 2rem;
        }
        .section-subtitle {
            text-align: center;
            color: var(--gray-500);
            font-size: 1.05rem;
            max-width: 640px;
            margin: 0 auto 48px auto;
        }
        .section-title-left { text-align: left; margin-bottom: 12px; }
        .section-subtitle-left { text-align: left; margin: 0 0 36px 0; }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--gray-200);
            height: var(--header-height);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 16px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--gray-900);
            flex-shrink: 0;
        }
        .nav-logo i { color: var(--primary); font-size: 1.5rem; }
        .nav-logo span { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-logo:hover { color: var(--gray-900); }
        .nav-panel {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }
        .nav-panel a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            color: var(--gray-600);
            font-size: 0.95rem;
            transition: var(--transition);
            position: relative;
        }
        .nav-panel a i { font-size: 0.9rem; }
        .nav-panel a:hover {
            color: var(--primary);
            background: var(--primary-50);
        }
        .nav-panel a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-panel a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }
        .nav-cta { flex-shrink: 0; }
        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            gap: 5px;
            background: var(--gray-100);
            border-radius: var(--radius-sm);
            cursor: pointer;
            flex-shrink: 0;
        }
        .nav-toggle span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--gray-700);
            border-radius: 2px;
            transition: var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 6px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -6px); }

        /* ===== Hero / Banner ===== */
        .banner {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--gray-900) 0%, var(--primary-dark) 60%, #1e3a5f 100%);
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .banner-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0,0,0,0.6) 0%, rgba(30,64,175,0.5) 100%);
            z-index: 1;
        }
        .banner .container { position: relative; z-index: 2; }
        .banner-content { max-width: 700px; }
        .banner-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
        }
        .banner-breadcrumb a { color: rgba(255,255,255,0.8); }
        .banner-breadcrumb a:hover { color: var(--white); }
        .banner-breadcrumb .sep { color: rgba(255,255,255,0.4); }
        .banner h1 {
            color: var(--white);
            font-size: 3rem;
            margin-bottom: 16px;
            line-height: 1.2;
        }
        .banner h1 i { color: var(--accent); margin-right: 8px; }
        .banner p {
            color: rgba(255,255,255,0.85);
            font-size: 1.15rem;
            max-width: 560px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .banner-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .banner-actions .btn { font-size: 1rem; padding: 14px 32px; }

        /* ===== Cards ===== */
        .card {
            background: var(--white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
            border: 1px solid var(--gray-100);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .card-img { width: 100%; aspect-ratio: 16/10; object-fit: cover; display: block; }
        .card-body { padding: 24px; }
        .card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--gray-900); }
        .card-text { color: var(--gray-500); font-size: 0.92rem; line-height: 1.6; }
        .card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
        .card-footer { padding: 16px 24px; border-top: 1px solid var(--gray-100); display: flex; align-items: center; justify-content: space-between; }

        /* ===== Grid ===== */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
        .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }

        /* ===== Steps ===== */
        .steps { counter-reset: step; display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; position: relative; }
        .steps::before {
            content: '';
            position: absolute;
            top: 36px;
            left: 10%;
            right: 10%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 3px;
            z-index: 0;
        }
        .step-item {
            counter-increment: step;
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--white);
            padding: 16px 12px 20px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .step-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 auto 12px;
            box-shadow: 0 4px 12px rgba(37,99,235,0.25);
        }
        .step-item:nth-child(2n) .step-number { background: var(--accent); box-shadow: 0 4px 12px rgba(245,158,11,0.25); }
        .step-item:nth-child(3n) .step-number { background: var(--success); box-shadow: 0 4px 12px rgba(16,185,129,0.25); }
        .step-title { font-weight: 700; font-size: 1rem; color: var(--gray-900); margin-bottom: 4px; }
        .step-desc { font-size: 0.85rem; color: var(--gray-500); }

        /* ===== FAQ ===== */
        .faq-list { max-width: 780px; margin: 0 auto; }
        .faq-item {
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-sm); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--gray-800);
            cursor: pointer;
            background: var(--gray-50);
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question:hover { background: var(--primary-50); color: var(--primary); }
        .faq-question i { color: var(--primary); font-size: 1.1rem; transition: var(--transition); }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--gray-600);
            line-height: 1.7;
            background: var(--white);
        }
        .faq-item.active .faq-answer {
            padding: 18px 24px 24px;
            max-height: 300px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 70px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-section h2 { color: var(--white); font-size: 2.2rem; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.85); font-size: 1.1rem; max-width: 560px; margin: 0 auto 28px; }
        .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* ===== Stats ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--gray-100);
            transition: var(--transition);
        }
        .stat-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .stat-number { font-size: 2.4rem; font-weight: 800; color: var(--primary); line-height: 1.2; }
        .stat-number i { font-size: 1.8rem; margin-right: 4px; color: var(--accent); }
        .stat-label { font-size: 0.92rem; color: var(--gray-500); margin-top: 6px; }

        /* ===== Safety tips ===== */
        .safety-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
        .safety-card {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 28px;
            background: var(--white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--gray-100);
            transition: var(--transition);
        }
        .safety-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .safety-icon {
            flex-shrink: 0;
            width: 56px;
            height: 56px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--white);
        }
        .safety-icon.blue { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
        .safety-icon.green { background: linear-gradient(135deg, var(--success), #059669); }
        .safety-icon.orange { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); }
        .safety-icon.purple { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
        .safety-info h4 { font-size: 1.05rem; margin-bottom: 6px; }
        .safety-info p { font-size: 0.9rem; color: var(--gray-500); margin-bottom: 0; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--gray-900);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .nav-logo { color: var(--white); margin-bottom: 12px; display: inline-flex; }
        .footer-brand .nav-logo span { -webkit-text-fill-color: var(--white); background: none; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 320px; }
        .footer-col h4 { color: var(--white); font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col a {
            display: flex;
            align-items: center;
            gap: 6px;
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a i { font-size: 0.65rem; }
        .footer-col a:hover { color: var(--white); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 28px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--white); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: 1fr 1fr; }
            .steps { grid-template-columns: repeat(3, 1fr); }
            .steps::before { display: none; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .section { padding: 50px 0; }
            .banner { padding: 70px 0 50px; min-height: 320px; }
            .banner h1 { font-size: 2.2rem; }
            .banner p { font-size: 1rem; }
            .nav-panel {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                box-shadow: 0 12px 40px rgba(0,0,0,0.12);
                transform: translateY(-110%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 2px solid var(--gray-100);
                z-index: 999;
            }
            .nav-panel.open { transform: translateY(0); opacity: 1; }
            .nav-panel a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); font-size: 1rem; }
            .nav-panel a.active::after { display: none; }
            .nav-panel a.active { background: var(--primary-light); }
            .nav-cta { display: none; }
            .nav-toggle { display: flex; }
            .grid-2, .grid-3, .grid-4, .safety-grid { grid-template-columns: 1fr; gap: 20px; }
            .steps { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stat-number { font-size: 1.8rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .banner-actions { flex-direction: column; align-items: flex-start; }
            .cta-actions { flex-direction: column; align-items: center; }
            .safety-card { flex-direction: column; align-items: center; text-align: center; }
            .safety-icon { width: 48px; height: 48px; font-size: 1.2rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            h1 { font-size: 1.7rem; }
            h2 { font-size: 1.35rem; }
            .section-title { font-size: 1.35rem; }
            .banner h1 { font-size: 1.7rem; }
            .banner { padding: 50px 0 36px; min-height: 260px; }
            .steps { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-item { padding: 18px 12px; }
            .stat-number { font-size: 1.5rem; }
            .btn { padding: 10px 20px; font-size: 0.9rem; }
            .btn-lg { padding: 14px 28px; font-size: 1rem; }
            .card-body { padding: 18px; }
            .faq-question { padding: 14px 16px; font-size: 0.92rem; }
            .faq-answer { padding: 0 16px; }
            .faq-item.active .faq-answer { padding: 14px 16px 18px; }
            .banner-breadcrumb { font-size: 0.8rem; }
        }
        /* ===== Focus visible accessibility ===== */
        a:focus-visible, button:focus-visible, .faq-question:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 2px;
        }
        /* ===== Smooth transition for all interactive ===== */
        .card, .btn, .badge, .step-item, .stat-item, .safety-card, .faq-item, .nav-panel a {
            transition: var(--transition);
        }