/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a6b;
            --primary-light: #2a5a9e;
            --primary-dark: #0f2444;
            --secondary: #e8a838;
            --secondary-light: #f0c56a;
            --secondary-dark: #c88a1e;
            --accent: #f5f0e8;
            --bg-light: #faf9f7;
            --bg-dark: #1a1a2e;
            --bg-card: #ffffff;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8a8aaa;
            --text-on-dark: #f0ece6;
            --border-color: #e5e0d8;
            --border-light: #f0ece6;
            --shadow-sm: 0 2px 8px rgba(26, 58, 107, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 58, 107, 0.08);
            --shadow-lg: 0 20px 60px rgba(26, 58, 107, 0.12);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --transition: 0.25s 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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 600; color: var(--text-primary); }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== Header / Navigation (分段标签导航) ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .logo i {
            color: var(--secondary);
            font-size: 26px;
        }
        .logo:hover { color: var(--primary); }
        .logo span { font-weight: 300; color: var(--text-secondary); }

        /* 分段标签导航 - chip style */
        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            padding: 4px 0;
        }
        .nav-chips::-webkit-scrollbar { display: none; }
        .nav-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            background: transparent;
            border: 1px solid transparent;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-chip i { font-size: 14px; opacity: 0.7; }
        .nav-chip:hover {
            color: var(--primary);
            background: rgba(26, 58, 107, 0.05);
            border-color: var(--border-color);
        }
        .nav-chip.active {
            color: #fff;
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(26, 58, 107, 0.2);
        }
        .nav-chip.active:hover {
            background: var(--primary-light);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-actions .btn-primary {
            padding: 8px 22px;
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
        }
        .mobile-menu-toggle {
            display: none;
            font-size: 24px;
            color: var(--text-primary);
            padding: 8px;
            border-radius: var(--radius-sm);
            background: transparent;
        }
        .mobile-menu-toggle:hover { background: rgba(26, 58, 107, 0.05); }

        @media (max-width: 768px) {
            .nav-chips { display: none; }
            .mobile-menu-toggle { display: flex; align-items: center; justify-content: center; }
            .header-actions .btn-primary { padding: 8px 16px; font-size: 13px; }
            .logo { font-size: 18px; }
            .logo i { font-size: 22px; }
        }

        /* 移动端展开菜单 */
        .mobile-nav-panel {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(12px);
            padding: 16px 24px 24px;
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-md);
            z-index: 999;
        }
        .mobile-nav-panel.open { display: block; }
        .mobile-nav-panel .nav-chip {
            display: flex;
            width: 100%;
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            font-size: 16px;
            border: 1px solid transparent;
        }
        .mobile-nav-panel .nav-chip.active {
            background: var(--primary);
            color: #fff;
        }
        .mobile-nav-panel .nav-chip + .nav-chip { margin-top: 6px; }

        /* ===== Hero ===== */
        .hero {
            padding: 140px 0 80px;
            background: var(--primary);
            background-image: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
            min-height: 600px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 120px;
            background: var(--bg-light);
            clip-path: ellipse(70% 100% at 50% 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 44px;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .hero-content h1 span {
            color: var(--secondary);
        }
        .hero-content p {
            font-size: 18px;
            color: rgba(255,255,255,0.8);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 520px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-image {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-image img {
            max-width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            transform: perspective(800px) rotateY(-4deg);
            transition: transform 0.6s ease;
        }
        .hero-image img:hover {
            transform: perspective(800px) rotateY(0deg);
        }

        @media (max-width: 1024px) {
            .hero { padding: 120px 0 64px; min-height: auto; }
            .hero-content h1 { font-size: 36px; }
        }
        @media (max-width: 768px) {
            .hero { padding: 100px 0 48px; }
            .hero .container { grid-template-columns: 1fr; text-align: center; gap: 32px; }
            .hero-content p { margin-left: auto; margin-right: auto; }
            .hero-buttons { justify-content: center; }
            .hero-content h1 { font-size: 30px; }
            .hero-image img { max-width: 80%; margin: 0 auto; transform: none; }
        }
        @media (max-width: 520px) {
            .hero-content h1 { font-size: 26px; }
            .hero-content p { font-size: 16px; }
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 100px;
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            background: var(--secondary);
            border: 2px solid var(--secondary);
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(232, 168, 56, 0.3);
        }
        .btn-primary:hover {
            background: var(--secondary-dark);
            border-color: var(--secondary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(232, 168, 56, 0.35);
        }
        .btn-primary:active { transform: translateY(0); }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 100px;
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            background: transparent;
            border: 2px solid rgba(255,255,255,0.4);
            transition: all var(--transition);
        }
        .btn-secondary:hover {
            border-color: #fff;
            color: #fff;
            background: rgba(255,255,255,0.1);
            transform: translateY(-2px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: 100px;
            font-size: 15px;
            font-weight: 500;
            color: var(--primary);
            background: transparent;
            border: 1.5px solid var(--border-color);
            transition: all var(--transition);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(26, 58, 107, 0.04);
            transform: translateY(-1px);
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 34px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }
        .section-title-left {
            text-align: left;
            margin-bottom: 8px;
        }
        .section-subtitle-left {
            text-align: left;
            margin: 0 0 40px;
        }
        .section-bg-alt {
            background: var(--accent);
        }
        .section-bg-dark {
            background: var(--bg-dark);
            color: var(--text-on-dark);
        }
        .section-bg-dark .section-title,
        .section-bg-dark .section-subtitle { color: #fff; }
        .section-bg-dark .section-subtitle { color: rgba(255,255,255,0.7); }

        @media (max-width: 768px) {
            .section { padding: 56px 0; }
            .section-title { font-size: 28px; }
            .section-subtitle { font-size: 16px; margin-bottom: 32px; }
        }

        /* ===== Features / Cards Grid ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: rgba(26, 58, 107, 0.1);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(232, 168, 56, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--secondary);
            margin-bottom: 18px;
        }
        .card h3 {
            font-size: 20px;
            margin-bottom: 10px;
            font-weight: 600;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 100px;
            font-size: 12px;
            font-weight: 500;
            background: rgba(26, 58, 107, 0.06);
            color: var(--primary-light);
            margin-bottom: 12px;
        }

        @media (max-width: 1024px) {
            .grid-3 { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 640px) {
            .grid-3, .grid-2 { grid-template-columns: 1fr; }
            .card { padding: 24px 20px; }
        }

        /* ===== Stats / 数据模块 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            text-align: center;
        }
        .stat-item h4 {
            font-size: 38px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 6px;
        }
        .stat-item p {
            color: rgba(255,255,255,0.75);
            font-size: 15px;
        }
        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .stat-item h4 { font-size: 30px; }
        }

        /* ===== Content List (CMS) ===== */
        .content-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .content-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .content-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .content-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--accent);
        }
        .content-card-body {
            padding: 20px 22px 24px;
        }
        .content-card-body .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .content-card-body .meta .cat {
            padding: 2px 10px;
            border-radius: 100px;
            background: rgba(232, 168, 56, 0.12);
            color: var(--secondary-dark);
            font-weight: 500;
            font-size: 12px;
        }
        .content-card-body h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .content-card-body h3 a { color: var(--text-primary); }
        .content-card-body h3 a:hover { color: var(--primary-light); }
        .content-card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .content-card-body .read-more {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 14px;
            font-weight: 500;
            color: var(--primary-light);
            margin-top: 12px;
        }
        .content-card-body .read-more:hover { gap: 8px; }

        @media (max-width: 1024px) {
            .content-list { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 640px) {
            .content-list { grid-template-columns: 1fr; }
            .content-card-img { height: 160px; }
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: rgba(26, 58, 107, 0.15); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            cursor: pointer;
            background: transparent;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: rgba(26, 58, 107, 0.02); }
        .faq-question i {
            font-size: 16px;
            color: var(--text-muted);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer { display: block; }

        @media (max-width: 640px) {
            .faq-question { padding: 14px 16px; font-size: 15px; }
            .faq-answer { padding: 0 16px 14px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            text-align: center;
            padding: 80px 0;
            background: var(--primary);
            background-image: linear-gradient(135deg, var(--primary-dark), var(--primary));
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255,255,255,0.8);
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-primary {
            font-size: 18px;
            padding: 14px 40px;
        }
        @media (max-width: 768px) {
            .cta-section h2 { font-size: 28px; }
            .cta-section p { font-size: 16px; }
            .cta-section { padding: 56px 0; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 20px;
            margin-bottom: 12px;
        }
        .footer-brand .logo i { color: var(--secondary); }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: var(--secondary); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--secondary); }

        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
            .footer-brand { grid-column: 1 / -1; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ===== Misc Utilities ===== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mt-24 { margin-top: 24px; }
        .mb-12 { margin-bottom: 12px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 500;
            background: rgba(232, 168, 56, 0.12);
            color: var(--secondary-dark);
        }
        .badge-primary {
            background: rgba(26, 58, 107, 0.08);
            color: var(--primary);
        }

        /* 回到顶部 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: var(--shadow-md);
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition);
            z-index: 999;
            border: none;
        }
        .back-to-top.visible { opacity: 1; visibility: visible; }
        .back-to-top:hover { background: var(--primary-light); transform: translateY(-3px); }

        /* 空列表提示 */
        .empty-tip {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
            font-size: 16px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a6b5c;
            --primary-dark: #0f4d42;
            --primary-light: #238b78;
            --accent: #f5c842;
            --accent-dark: #dbaa2a;
            --bg-body: #f8faf9;
            --bg-card: #ffffff;
            --bg-soft: #edf3f0;
            --bg-dark: #0f2b25;
            --text-primary: #1a2e2a;
            --text-secondary: #4a6b62;
            --text-light: #7e9b92;
            --text-white: #ffffff;
            --border: #dce8e3;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 12px rgba(26, 107, 92, 0.06);
            --shadow-md: 0 8px 32px rgba(26, 107, 92, 0.10);
            --shadow-lg: 0 20px 60px rgba(26, 107, 92, 0.14);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 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);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        ul { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 820px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
            line-height: 1.3;
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            line-height: 1.6;
        }
        .text-center { text-align: center; }
        .mx-auto { margin-left: auto; margin-right: auto; }

        /* ===== Header / 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: -0.02em;
        }
        .logo i { color: var(--accent); font-size: 1.6rem; }
        .logo a { color: inherit; text-decoration: none; }
        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            background: var(--bg-soft);
            padding: 4px;
            border-radius: 50px;
        }
        .nav-chip {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-chip i { font-size: 0.85rem; }
        .nav-chip:hover { color: var(--primary); background: rgba(26,107,92,0.08); }
        .nav-chip.active {
            background: var(--bg-card);
            color: var(--primary-dark);
            box-shadow: var(--shadow-sm);
            font-weight: 600;
        }
        .nav-chip.active i { color: var(--accent); }
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            background: var(--primary);
            color: var(--text-white) !important;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
            text-decoration: none;
        }
        .header-cta:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .mobile-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text-primary); cursor: pointer; padding: 4px 8px; }

        /* ===== 文章头部 ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #1a3d35 100%);
            color: var(--text-white);
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.15;
            pointer-events: none;
        }
        .article-banner .container-narrow {
            position: relative;
            z-index: 2;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a { color: rgba(255,255,255,0.7); text-decoration: none; }
        .article-breadcrumb a:hover { color: var(--accent); }
        .article-breadcrumb .sep { color: rgba(255,255,255,0.3); }
        .article-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.25;
            margin-bottom: 20px;
            color: var(--text-white);
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
        }
        .article-meta i { margin-right: 6px; color: var(--accent); }
        .article-meta span { display: inline-flex; align-items: center; }

        /* ===== 文章正文 ===== */
        .article-main {
            padding: 60px 0 80px;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-primary);
        }
        .article-body h2, .article-body h3, .article-body h4 {
            color: var(--primary-dark);
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            font-weight: 700;
            letter-spacing: -0.01em;
        }
        .article-body h2 { font-size: 1.6rem; }
        .article-body h3 { font-size: 1.3rem; }
        .article-body p { margin-bottom: 1.2em; }
        .article-body ul, .article-body ol { margin-bottom: 1.2em; padding-left: 1.5em; }
        .article-body li { margin-bottom: 0.4em; }
        .article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
        .article-body a:hover { color: var(--accent-dark); }
        .article-body img { border-radius: var(--radius-md); margin: 1.5em 0; box-shadow: var(--shadow-sm); }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 24px;
            margin: 1.5em 0;
            background: var(--bg-soft);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body code {
            background: var(--bg-soft);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary-dark);
        }
        .article-not-found {
            text-align: center;
            padding: 80px 24px;
            color: var(--text-secondary);
        }
        .article-not-found i { font-size: 3rem; color: var(--text-light); margin-bottom: 16px; display: block; }
        .article-not-found h2 { font-size: 1.6rem; color: var(--text-primary); margin-bottom: 12px; }
        .article-not-found p { margin-bottom: 24px; }
        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: 50px;
            font-weight: 600;
            transition: all var(--transition);
            text-decoration: none;
        }
        .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); color: var(--text-white); }

        /* ===== 推荐文章 ===== */
        .related-section {
            padding: 60px 0 80px;
            background: var(--bg-soft);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 40px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
        .related-card img { width: 100%; height: 200px; object-fit: cover; border-radius: 0; }
        .related-card-body { padding: 20px 24px 24px; }
        .related-card-body h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
        .related-card-body h3 a { color: var(--text-primary); text-decoration: none; }
        .related-card-body h3 a:hover { color: var(--primary); }
        .related-card-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
        .related-card-body .meta { font-size: 0.8rem; color: var(--text-light); margin-top: 12px; display: flex; align-items: center; gap: 12px; }

        /* ===== FAQ 区块 ===== */
        .faq-section {
            padding: 70px 0;
            background: var(--bg-card);
        }
        .faq-list {
            max-width: 780px;
            margin: 40px auto 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
            background: var(--bg-body);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: color var(--transition);
        }
        .faq-question i { color: var(--primary); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 0.95rem;
            display: none;
        }
        .faq-item.active .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(135deg, var(--primary-dark) 0%, #0d3d34 100%);
            color: var(--text-white);
            text-align: center;
        }
        .cta-section h2 { font-size: 2.2rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px; }
        .cta-section p { font-size: 1.05rem; color: rgba(255,255,255,0.75); max-width: 600px; margin: 0 auto 32px; line-height: 1.7; }
        .cta-btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 40px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
        }
        .cta-btn-primary { background: var(--accent); color: var(--primary-dark); }
        .cta-btn-primary:hover { background: #fff; color: var(--primary-dark); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(245,200,66,0.3); }
        .cta-btn-outline { background: transparent; color: var(--text-white); border: 2px solid rgba(255,255,255,0.3); }
        .cta-btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }

        /* ===== 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: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 16px; }
        .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: 0.95rem; font-weight: 700; color: var(--text-white); margin-bottom: 18px; letter-spacing: 0.02em; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.55); font-size: 0.9rem; text-decoration: none; transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.4); text-decoration: none; }
        .footer-bottom a:hover { color: var(--accent); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .related-grid { grid-template-columns: 1fr 1fr; }
            .article-banner h1 { font-size: 2.2rem; }
            .article-body { padding: 36px 32px; }
        }
        @media (max-width: 768px) {
            .mobile-toggle { display: block; }
            .nav-chips { display: none; position: absolute; top: var(--header-h); left: 0; right: 0; background: var(--bg-card); flex-direction: column; padding: 16px; border-radius: 0 0 var(--radius-md) var(--radius-md); box-shadow: var(--shadow-lg); border: 1px solid var(--border); gap: 8px; }
            .nav-chips.open { display: flex; }
            .nav-chip { width: 100%; justify-content: center; padding: 12px 20px; }
            .header-cta { display: none; }
            .header-cta.mobile-show { display: inline-flex; margin-top: 8px; width: 100%; justify-content: center; }
            .article-banner { padding: 60px 0 40px; }
            .article-banner h1 { font-size: 1.7rem; }
            .article-meta { gap: 12px; font-size: 0.8rem; flex-direction: column; }
            .article-body { padding: 24px 20px; border-radius: var(--radius-md); font-size: 1rem; }
            .related-grid { grid-template-columns: 1fr; gap: 20px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .section-title { font-size: 1.6rem; }
            .cta-section h2 { font-size: 1.6rem; }
            .cta-btn { width: 100%; justify-content: center; }
            .cta-btn-group { flex-direction: column; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-banner h1 { font-size: 1.4rem; }
            .article-body { padding: 18px 16px; }
            .related-card-body { padding: 16px 18px 20px; }
            .faq-question { padding: 14px 18px; font-size: 0.9rem; }
            .faq-answer { padding: 0 18px 14px; }
        }

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

        /* ===== 标签 ===== */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
            background: rgba(26,107,92,0.1);
            border: 1px solid rgba(26,107,92,0.15);
        }
        .tag i { margin-right: 4px; }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f7a8a;
            --primary-dark: #0a5c68;
            --primary-light: #e6f3f5;
            --primary-glow: rgba(15, 122, 138, 0.15);
            --secondary: #f5a623;
            --secondary-light: #fef0d9;
            --accent: #2ec4b6;
            --accent-light: #d9f5f2;
            --bg-white: #ffffff;
            --bg-light: #f7fafc;
            --bg-warm: #fdfcfa;
            --bg-dark: #0a2a30;
            --text-dark: #1a2b3c;
            --text-body: #2d4a5a;
            --text-muted: #6b8a9a;
            --text-white: #f0f7fa;
            --border-light: #e2edf2;
            --border-medium: #c8dce5;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(10, 44, 56, 0.06);
            --shadow-md: 0 8px 28px rgba(10, 44, 56, 0.08);
            --shadow-lg: 0 20px 48px rgba(10, 44, 56, 0.12);
            --shadow-xl: 0 32px 64px rgba(10, 44, 56, 0.16);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-max: 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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-dark);
            line-height: 1.3;
            font-weight: 700;
            letter-spacing: -0.01em;
        }

        h1 {
            font-size: clamp(2rem, 5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2vw, 1.5rem);
        }
        h4 {
            font-size: 1.15rem;
        }

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

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            line-height: 1.2;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px var(--primary-glow);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 24px var(--primary-glow);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-primary:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-secondary {
            background: var(--bg-white);
            color: var(--primary);
            border: 2px solid var(--border-medium);
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(46, 196, 182, 0.3);
        }
        .btn-accent:hover {
            background: #1da89a;
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-lg {
            padding: 18px 42px;
            font-size: 1.1rem;
            border-radius: var(--radius-md);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 0.9rem;
        }
        .btn i {
            font-size: 1.1em;
        }

        @media (max-width: 520px) {
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
            .btn {
                padding: 12px 24px;
            }
        }

        /* ===== Tags / Badges ===== */
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 100px;
            font-size: 0.82rem;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary-dark);
            border: 1px solid rgba(15, 122, 138, 0.15);
        }
        .tag-accent {
            background: var(--accent-light);
            color: #0d7a6e;
            border-color: rgba(46, 196, 182, 0.2);
        }
        .tag-secondary {
            background: var(--secondary-light);
            color: #b87d1a;
            border-color: rgba(245, 166, 35, 0.2);
        }
        .tag i {
            font-size: 0.75rem;
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            background: var(--primary);
            color: #fff;
        }
        .badge-warm {
            background: var(--secondary);
            color: #fff;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 24px;
        }
        .card-body h3 {
            margin-bottom: 8px;
        }
        .card-body p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        .card-footer {
            padding: 16px 24px;
            border-top: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .card-body {
                padding: 18px;
            }
            .card-footer {
                padding: 12px 18px;
            }
        }

        /* ===== Section Spacing ===== */
        .section {
            padding: 80px 0;
        }
        .section-sm {
            padding: 50px 0;
        }
        .section-lg {
            padding: 110px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-title h2 {
            margin-bottom: 16px;
        }
        .section-title p {
            max-width: 640px;
            margin: 0 auto;
            color: var(--text-muted);
            font-size: 1.1rem;
        }
        .section-title .tag {
            margin-bottom: 16px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-lg {
                padding: 72px 0;
            }
            .section-title {
                margin-bottom: 36px;
            }
            .section-title p {
                font-size: 1rem;
            }
        }

        /* ===== Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 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(--border-light);
            transition: var(--transition);
            height: var(--nav-height);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.02em;
        }
        .logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .logo a {
            color: inherit;
        }
        .logo a:hover {
            color: var(--primary);
        }

        .nav-chips {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-chips::-webkit-scrollbar {
            display: none;
        }
        .nav-chip {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-body);
            background: transparent;
            border: 1px solid transparent;
            transition: var(--transition);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-chip i {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .nav-chip:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: var(--border-medium);
        }
        .nav-chip:hover i {
            color: var(--primary);
        }
        .nav-chip.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 14px var(--primary-glow);
        }
        .nav-chip.active i {
            color: #fff;
        }
        .nav-chip:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .nav-cta .btn {
            padding: 10px 24px;
            font-size: 0.9rem;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }

        @media (max-width: 900px) {
            .nav-chips {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border-light);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: var(--shadow-lg);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                max-height: 70vh;
                overflow-y: auto;
            }
            .nav-chips.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-chip {
                width: 100%;
                justify-content: center;
                padding: 14px 20px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .nav-toggle {
                display: block;
            }
            .nav-cta .btn-sm {
                display: none;
            }
            .nav-cta .btn-sm.mobile-visible {
                display: inline-flex;
            }
        }

        @media (max-width: 520px) {
            .logo {
                font-size: 1.1rem;
            }
            .logo i {
                font-size: 1.2rem;
            }
            .nav-cta .btn {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
        }

        /* ===== Hero / Banner ===== */
        .hero-banner {
            margin-top: var(--nav-height);
            min-height: 420px;
            display: flex;
            align-items: center;
            position: relative;
            background: var(--bg-dark) url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            isolation: isolate;
            overflow: hidden;
        }
        .hero-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 42, 48, 0.88) 40%, rgba(10, 42, 48, 0.55) 80%, rgba(10, 42, 48, 0.3) 100%);
            z-index: 1;
        }
        .hero-banner .container {
            position: relative;
            z-index: 2;
            padding: 60px 24px;
            width: 100%;
        }
        .hero-banner .tag {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(4px);
            margin-bottom: 20px;
        }
        .hero-banner h1 {
            color: #fff;
            max-width: 720px;
            margin-bottom: 20px;
            font-weight: 800;
            letter-spacing: -0.02em;
        }
        .hero-banner p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.15rem;
            max-width: 580px;
            line-height: 1.7;
            margin-bottom: 32px;
        }
        .hero-banner .btn-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-banner .btn-primary {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .hero-banner .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .hero-banner .btn-secondary {
            border-color: rgba(255, 255, 255, 0.3);
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(4px);
        }
        .hero-banner .btn-secondary:hover {
            border-color: rgba(255, 255, 255, 0.6);
            background: rgba(255, 255, 255, 0.15);
        }

        @media (max-width: 768px) {
            .hero-banner {
                min-height: 340px;
            }
            .hero-banner .container {
                padding: 40px 16px;
            }
            .hero-banner h1 {
                font-size: 1.8rem;
            }
            .hero-banner p {
                font-size: 1rem;
            }
            .hero-banner .btn-group {
                flex-direction: column;
                gap: 12px;
            }
        }

        /* ===== Features / 核心优势 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
            border-color: var(--border-medium);
        }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            border-radius: var(--radius-sm);
            background: var(--primary-light);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .feature-card:hover .icon {
            background: var(--primary);
            color: #fff;
        }
        .feature-card h3 {
            margin-bottom: 12px;
            font-size: 1.2rem;
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 640px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .feature-card {
                padding: 28px 20px;
            }
        }

        /* ===== Game Types / 游戏分类 ===== */
        .game-types-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .game-type-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .game-type-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .game-type-card .card-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
        }
        .game-type-card .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .game-type-card .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .game-type-card .card-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            flex: 1;
            margin-bottom: 16px;
        }
        .game-type-card .card-body .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
        }

        @media (max-width: 1024px) {
            .game-types-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 640px) {
            .game-types-grid {
                grid-template: 1fr;
                gap: 20px;
            }
            .game-type-card .card-body {
                padding: 18px;
            }
        }

        /* ===== Flow / 使用流程 ===== */
        .flow-section {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .flow-section .section-title h2 {
            color: #fff;
        }
        .flow-section .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        .flow-step {
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            padding: 36px 24px;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
            position: relative;
        }
        .flow-step:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-4px);
        }
        .flow-step .step-num {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-size: 1.4rem;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            box-shadow: 0 4px 16px rgba(46, 196, 182, 0.3);
        }
        .flow-step h4 {
            color: #fff;
            font-size: 1.05rem;
            margin-bottom: 10px;
        }
        .flow-step p {
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .flow-step .step-arrow {
            position: absolute;
            right: -18px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--accent);
            font-size: 1.4rem;
            opacity: 0.5;
        }
        .flow-step:last-child .step-arrow {
            display: none;
        }

        @media (max-width: 1024px) {
            .flow-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .flow-step .step-arrow {
                display: none;
            }
        }
        @media (max-width: 640px) {
            .flow-steps {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .flow-step {
                padding: 28px 18px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-medium);
        }
        .faq-question {
            padding: 20px 28px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.2rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 28px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 28px 20px;
        }
        .faq-answer p {
            padding-top: 4px;
        }

        @media (max-width: 768px) {
            .faq-question {
                padding: 16px 20px;
                font-size: 0.95rem;
            }
            .faq-answer.open {
                padding: 0 20px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, #0a2a30 100%);
            color: #fff;
            text-align: center;
            padding: 80px 0;
            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: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: #fff;
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-section .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .cta-section .btn-primary {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }
        .cta-section .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .cta-section .btn-secondary {
            border-color: rgba(255, 255, 255, 0.3);
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(4px);
        }
        .cta-section .btn-secondary:hover {
            border-color: rgba(255, 255, 255, 0.5);
            background: rgba(255, 255, 255, 0.12);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 0;
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 16px;
        }
        .footer-brand .logo i {
            color: var(--accent);
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.55);
            max-width: 360px;
            line-height: 1.7;
            font-size: 0.9rem;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Extra UI ===== */
        .divider {
            height: 1px;
            background: var(--border-light);
            margin: 0;
            border: none;
        }
        .divider-dark {
            background: rgba(255, 255, 255, 0.06);
        }

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

        .mb-0 {
            margin-bottom: 0;
        }
        .mb-12 {
            margin-bottom: 12px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-40 {
            margin-bottom: 40px;
        }

        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-40 {
            margin-top: 40px;
        }

        /* ===== Responsive fine-tune ===== */
        @media (max-width: 520px) {
            .hero-banner h1 {
                font-size: 1.6rem;
            }
            .hero-banner p {
                font-size: 0.95rem;
            }
            .section-title h2 {
                font-size: 1.5rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
            .flow-step .step-num {
                width: 44px;
                height: 44px;
                font-size: 1.2rem;
            }
        }

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

        /* ===== Focus ===== */
        :focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== Smooth background ===== */
        .bg-soft {
            background: var(--bg-warm);
        }
        .bg-light {
            background: var(--bg-light);
        }
        .bg-white {
            background: var(--bg-white);
        }