/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f0f2e;
            --primary-light: #1a1a4e;
            --primary-dark: #08081a;
            --secondary: #d4a84b;
            --secondary-light: #e8c46a;
            --secondary-dark: #b8923a;
            --bg: #ffffff;
            --bg-alt: #f5f7fa;
            --bg-dark: #0a0a1a;
            --text: #1a1a2e;
            --text-light: #6b7280;
            --text-lighter: #9ca3af;
            --text-on-dark: #f9fafb;
            --text-on-dark-muted: #c4c4d0;
            --border: #e5e7eb;
            --border-light: #f0f0f5;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --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 40px rgba(212, 168, 75, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --section-padding: 80px 0;
            --card-gap: 28px;
        }

        /* ===== Reset ===== */
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
        }
        h1 {
            font-size: clamp(2.4rem, 5vw, 3.6rem);
        }
        h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2vw, 1.5rem);
        }
        p {
            color: var(--text-light);
            margin-bottom: 1rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(15, 15, 46, 0.55);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .nav.scrolled {
            background: rgba(15, 15, 46, 0.94);
            box-shadow: 0 4px 32px rgba(0, 0, 0, 0.25);
            border-bottom-color: rgba(255, 255, 255, 0.08);
        }
        .nav-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-on-dark);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }
        .nav-logo i {
            color: var(--secondary);
            font-size: 1.2rem;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-link {
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            border-radius: 8px;
            transition: color var(--transition), background var(--transition);
            letter-spacing: 0.3px;
            position: relative;
        }
        .nav-link:hover {
            color: var(--text-on-dark);
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-link.active {
            color: var(--secondary);
            background: rgba(212, 168, 75, 0.12);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--secondary);
            border-radius: 2px;
        }
        .nav-toggle {
            display: none;
            font-size: 1.4rem;
            color: var(--text-on-dark);
            padding: 8px 12px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg,
                    rgba(15, 15, 46, 0.88) 0%,
                    rgba(26, 26, 78, 0.72) 40%,
                    rgba(15, 15, 46, 0.60) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 200px;
            background: linear-gradient(to top, var(--bg), transparent);
            z-index: 2;
        }
        .hero-content {
            position: relative;
            z-index: 3;
            text-align: center;
            max-width: 820px;
            padding: 0 24px;
            margin-top: -40px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            background: rgba(212, 168, 75, 0.15);
            border: 1px solid rgba(212, 168, 75, 0.25);
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--secondary-light);
            margin-bottom: 28px;
            letter-spacing: 0.5px;
            backdrop-filter: blur(4px);
        }
        .hero-badge i {
            font-size: 0.75rem;
        }
        .hero h1 {
            color: var(--text-on-dark);
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .hero h1 span {
            color: var(--secondary);
        }
        .hero p {
            font-size: clamp(1.05rem, 2vw, 1.25rem);
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all var(--transition);
            letter-spacing: 0.3px;
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--secondary);
            color: var(--primary-dark);
            border-color: var(--secondary);
            box-shadow: 0 4px 20px rgba(212, 168, 75, 0.3);
        }
        .btn-primary:hover {
            background: var(--secondary-light);
            border-color: var(--secondary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(212, 168, 75, 0.4);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-on-dark);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .hero-scroll {
            position: absolute;
            bottom: 40px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 3;
            color: rgba(255, 255, 255, 0.5);
            font-size: 1.2rem;
            animation: bounce 2s infinite;
        }
        @keyframes bounce {
            0%,
            100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(10px);
            }
        }

        /* ===== Section 通用 ===== */
        .section {
            padding: var(--section-padding);
        }
        .section.bg-alt {
            background: var(--bg-alt);
        }
        .section.bg-dark {
            background: var(--bg-dark);
            color: var(--text-on-dark);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            margin-bottom: 12px;
        }
        .section-header p {
            max-width: 560px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-header .subtitle {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(212, 168, 75, 0.1);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .section.bg-dark .section-header h2 {
            color: var(--text-on-dark);
        }
        .section.bg-dark .section-header p {
            color: var(--text-on-dark-muted);
        }
        .section.bg-dark .subtitle {
            background: rgba(212, 168, 75, 0.15);
        }

        /* ===== 特色板块 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }
        .feature-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 36px 30px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(212, 168, 75, 0.2);
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: linear-gradient(135deg, rgba(212, 168, 75, 0.12), rgba(212, 168, 75, 0.05));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.6rem;
            color: var(--secondary);
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: linear-gradient(135deg, rgba(212, 168, 75, 0.2), rgba(212, 168, 75, 0.08));
            transform: scale(1.05);
        }
        .feature-card h3 {
            margin-bottom: 10px;
            color: var(--text);
        }
        .feature-card p {
            font-size: 0.95rem;
            margin-bottom: 0;
        }

        /* ===== 分类板块 ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
        }
        .category-card {
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .category-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform var(--transition);
        }
        .category-card:hover .card-img {
            transform: scale(1.05);
        }
        .category-card .card-body {
            padding: 20px 24px 24px;
        }
        .category-card .card-body h3 {
            margin-bottom: 6px;
            font-size: 1.15rem;
        }
        .category-card .card-body p {
            font-size: 0.9rem;
            margin-bottom: 16px;
            color: var(--text-light);
        }
        .category-card .card-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
            background: rgba(212, 168, 75, 0.1);
            color: var(--secondary);
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--secondary);
            transition: gap var(--transition);
        }
        .card-link:hover {
            gap: 12px;
            color: var(--secondary-light);
        }
        .card-link i {
            font-size: 0.75rem;
        }

        /* ===== 最新资讯列表 ===== */
        .news-list {
            display: grid;
            gap: 16px;
        }
        .news-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            padding: 20px 24px;
            background: var(--bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .news-item:hover {
            border-color: rgba(212, 168, 75, 0.25);
            box-shadow: var(--shadow);
            transform: translateX(4px);
        }
        .news-item .news-num {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(212, 168, 75, 0.1);
            color: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
        }
        .news-item .news-content {
            flex: 1;
            min-width: 0;
        }
        .news-item .news-title {
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            margin-bottom: 4px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-item .news-title a {
            color: inherit;
        }
        .news-item .news-title a:hover {
            color: var(--secondary);
        }
        .news-item .news-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--text-lighter);
        }
        .news-item .news-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .news-item .news-meta i {
            font-size: 0.7rem;
        }
        .news-empty {
            text-align: center;
            padding: 48px 24px;
            background: var(--bg-alt);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
            color: var(--text-light);
        }
        .news-empty i {
            font-size: 2rem;
            color: var(--text-lighter);
            margin-bottom: 12px;
            display: block;
        }

        /* ===== 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-number {
            font-size: clamp(2.4rem, 4vw, 3.2rem);
            font-weight: 800;
            color: var(--secondary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 0.95rem;
            color: var(--text-on-dark-muted);
            font-weight: 500;
        }
        .stat-divider {
            width: 40px;
            height: 3px;
            background: rgba(212, 168, 75, 0.3);
            margin: 12px auto;
            border-radius: 2px;
        }

        /* ===== 使用流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gap);
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 48px;
            left: calc(16.66% + 12px);
            right: calc(16.66% + 12px);
            height: 2px;
            background: linear-gradient(to right, var(--secondary), rgba(212, 168, 75, 0.2));
            z-index: 0;
        }
        .step-card {
            text-align: center;
            position: relative;
            z-index: 1;
            padding: 0 16px;
        }
        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: var(--primary-dark);
            font-weight: 800;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            box-shadow: 0 4px 20px rgba(212, 168, 75, 0.25);
        }
        .step-card h3 {
            margin-bottom: 8px;
            color: var(--text);
        }
        .step-card p {
            font-size: 0.92rem;
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: grid;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(212, 168, 75, 0.2);
        }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            text-align: left;
            transition: color var(--transition);
            background: transparent;
        }
        .faq-question:hover {
            color: var(--secondary);
        }
        .faq-question i {
            font-size: 0.8rem;
            color: var(--text-lighter);
            transition: transform var(--transition), color var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .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;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
            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;
        }
        .cta-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-content h2 {
            color: var(--text-on-dark);
            margin-bottom: 12px;
        }
        .cta-content p {
            color: var(--text-on-dark-muted);
            font-size: 1.05rem;
            margin-bottom: 32px;
        }
        .cta-content .btn-primary {
            box-shadow: 0 4px 28px rgba(212, 168, 75, 0.35);
        }
        .cta-content .btn-primary:hover {
            box-shadow: 0 8px 40px rgba(212, 168, 75, 0.5);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary-dark);
            color: var(--text-on-dark-muted);
            padding: 48px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand h3 {
            color: var(--text-on-dark);
            font-size: 1.2rem;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-brand h3 i {
            color: var(--secondary);
        }
        .footer-brand p {
            color: var(--text-on-dark-muted);
            font-size: 0.9rem;
            max-width: 300px;
        }
        .footer-col h4 {
            color: var(--text-on-dark);
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: var(--text-on-dark-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-on-dark-muted);
        }
        .footer-bottom a {
            color: var(--text-on-dark-muted);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-on-dark-muted);
            font-size: 0.9rem;
            transition: all var(--transition);
        }
        .footer-social a:hover {
            background: rgba(212, 168, 75, 0.15);
            color: var(--secondary);
            transform: translateY(-2px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 56px 0;
                --nav-height: 64px;
            }
            .nav-menu {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(15, 15, 46, 0.98);
                backdrop-filter: blur(24px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                transform: translateY(-110%);
                opacity: 0;
                transition: all 0.4s ease;
                pointer-events: none;
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-link {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav-link.active::after {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .hero {
                min-height: 90vh;
            }
            .hero h1 {
                font-size: clamp(2rem, 6vw, 2.8rem);
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .categories-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .news-item {
                flex-direction: column;
                gap: 12px;
                padding: 16px 18px;
            }
            .news-item .news-num {
                width: 32px;
                height: 32px;
                font-size: 0.8rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px;
                font-size: 0.9rem;
            }
            .faq-item.active .faq-answer {
                padding: 0 18px 16px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 0.95rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 16px 8px;
            }
            .stat-number {
                font-size: 2rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .category-card .card-body {
                padding: 16px 18px 20px;
            }
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-alt);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--text-lighter);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-light);
        }

        /* ===== 聚焦样式 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== 选中颜色 ===== */
        ::selection {
            background: rgba(212, 168, 75, 0.25);
            color: var(--text);
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2a3f8a;
            --primary-dark: #0f1a4a;
            --accent: #e8b830;
            --accent-light: #f0d060;
            --accent-dark: #c9a020;
            --bg-body: #f8f9fc;
            --bg-white: #ffffff;
            --bg-light: #eef0f7;
            --bg-dark: #121a30;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #8888aa;
            --text-white: #ffffff;
            --border-color: #e0e3ed;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 108, 0.06);
            --shadow-md: 0 8px 28px rgba(26, 42, 108, 0.10);
            --shadow-lg: 0 16px 48px rgba(26, 42, 108, 0.14);
            --shadow-glow: 0 0 30px rgba(232, 184, 48, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-width: 1200px;
            --header-height: 72px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            padding-top: var(--header-height);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 1rem;
        }
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            outline: none;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 10px 16px;
            transition: var(--transition);
        }
        input:focus,
        textarea:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(232, 184, 48, 0.15);
        }
        ul {
            list-style: none;
        }

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

        /* ===== 导航栏 ===== */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.75);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(224, 227, 237, 0.5);
            box-shadow: 0 2px 20px rgba(26, 42, 108, 0.05);
            transition: var(--transition);
        }
        .nav.scrolled {
            background: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 30px rgba(26, 42, 108, 0.08);
        }
        .nav-container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
        }
        .nav-logo i {
            color: var(--accent);
            font-size: 1.6rem;
        }
        .nav-logo:hover {
            opacity: 0.9;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-link {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.05);
        }
        .nav-link.active {
            color: var(--primary);
            background: rgba(26, 42, 108, 0.08);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 2px;
            background: var(--accent);
        }
        .nav-toggle {
            display: none;
            font-size: 1.4rem;
            color: var(--primary);
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .nav-toggle:hover {
            background: rgba(26, 42, 108, 0.06);
        }

        /* ===== 移动端导航 ===== */
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: var(--shadow-md);
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-link {
                width: 100%;
                padding: 12px 16px;
                font-size: 1.05rem;
            }
            .nav-link.active::after {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
        }

        /* ===== Banner 区域 ===== */
        .banner {
            position: relative;
            padding: 80px 0 72px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .banner-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .banner-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(232, 184, 48, 0.10) 0%, transparent 70%);
        }
        .banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
            color: var(--text-white);
        }
        .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(232, 184, 48, 0.18);
            border: 1px solid rgba(232, 184, 48, 0.30);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--accent-light);
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .banner-badge i {
            font-size: 0.75rem;
        }
        .banner h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
        }
        .banner h1 span {
            color: var(--accent);
        }
        .banner p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .banner-stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            flex-wrap: wrap;
        }
        .banner-stat {
            text-align: center;
        }
        .banner-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            display: block;
            line-height: 1.2;
        }
        .banner-stat .label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.70);
            margin-top: 4px;
        }
        @media (max-width: 768px) {
            .banner {
                padding: 60px 0 56px;
                min-height: 260px;
            }
            .banner h1 {
                font-size: 2rem;
            }
            .banner p {
                font-size: 1rem;
            }
            .banner-stats {
                gap: 24px;
            }
            .banner-stat .num {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .banner h1 {
                font-size: 1.6rem;
            }
            .banner-stats {
                gap: 16px;
            }
            .banner-stat {
                flex: 1 1 80px;
            }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 72px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .section-header h2 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header .divider {
            width: 48px;
            height: 4px;
            background: var(--accent);
            border-radius: 2px;
            margin: 16px auto 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-header h2 {
                font-size: 1.7rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            gap: 28px;
        }
        .card-grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .card-grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }
        .card-grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        @media (max-width: 1024px) {
            .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .card-grid-2,
            .card-grid-3,
            .card-grid-4 {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 分类卡片 ===== */
        .sport-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        .sport-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: rgba(232, 184, 48, 0.25);
        }
        .sport-card .card-img {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-light);
        }
        .sport-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .sport-card:hover .card-img img {
            transform: scale(1.05);
        }
        .sport-card .card-img .tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: var(--primary-dark);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 50px;
            letter-spacing: 0.3px;
        }
        .sport-card .card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .sport-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .sport-card .card-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }
        .sport-card .card-body .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 14px;
            font-size: 0.82rem;
            color: var(--text-light);
            border-top: 1px solid var(--border-color);
            padding-top: 14px;
        }
        .sport-card .card-body .card-meta i {
            width: 14px;
            color: var(--accent);
        }

        /* ===== 资讯列表 ===== */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-item {
            display: flex;
            align-items: flex-start;
            gap: 18px;
            background: var(--bg-white);
            padding: 18px 22px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .news-item:hover {
            box-shadow: var(--shadow-md);
            border-color: rgba(232, 184, 48, 0.20);
            transform: translateX(4px);
        }
        .news-item .news-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.2rem;
        }
        .news-item .news-content {
            flex: 1;
        }
        .news-item .news-content h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
        }
        .news-item .news-content p {
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        .news-item .news-time {
            flex-shrink: 0;
            font-size: 0.8rem;
            color: var(--text-light);
            white-space: nowrap;
            padding-top: 2px;
        }
        @media (max-width: 520px) {
            .news-item {
                flex-wrap: wrap;
                gap: 10px;
            }
            .news-item .news-time {
                width: 100%;
                text-align: right;
            }
        }

        /* ===== 数据统计区块 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .stat-card .stat-icon {
            font-size: 2.2rem;
            color: var(--accent);
            margin-bottom: 12px;
        }
        .stat-card .stat-num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 20px 12px;
            }
            .stat-card .stat-num {
                font-size: 1.8rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            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-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(232, 184, 48, 0.25);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            text-align: left;
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question:hover {
            background: rgba(26, 42, 108, 0.02);
        }
        .faq-question i {
            color: var(--accent);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px 18px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA 区域 ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.10;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.80);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            border-radius: 50px;
            font-size: 1.05rem;
            font-weight: 700;
            background: var(--accent);
            color: var(--primary-dark);
            transition: var(--transition);
            box-shadow: 0 8px 30px rgba(232, 184, 48, 0.30);
        }
        .cta-btn:hover {
            background: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(232, 184, 48, 0.40);
            color: var(--primary-dark);
        }
        .cta-btn i {
            font-size: 1.1rem;
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .cta-btn {
                padding: 14px 32px;
                font-size: 0.95rem;
            }
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.80);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand h3 {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 14px;
        }
        .footer-brand h3 i {
            color: var(--accent);
            margin-right: 6px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.65);
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-col a i {
            width: 20px;
            color: var(--accent);
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.70);
            padding: 0;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: var(--primary-dark);
            padding: 0;
            transform: scale(1.1);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.50);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.60);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 背景区块变体 ===== */
        .section-bg-light {
            background: var(--bg-light);
        }
        .section-bg-white {
            background: var(--bg-white);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-light);
            padding: 16px 0 0;
            max-width: var(--container-width);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--primary);
            font-weight: 500;
        }
        .breadcrumb i {
            font-size: 0.65rem;
            color: var(--text-light);
        }

        /* ===== 热门标签 ===== */
        .hot-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 20px;
        }
        .hot-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 0.88rem;
            font-weight: 500;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .hot-tag:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
        }
        .hot-tag i {
            font-size: 0.8rem;
            color: var(--accent);
        }
        .hot-tag:hover i {
            color: var(--primary-dark);
        }

        /* ===== 图文区块 ===== */
        .feature-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .feature-row.reverse {
            direction: rtl;
        }
        .feature-row.reverse>* {
            direction: ltr;
        }
        .feature-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .feature-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .feature-text h3 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .feature-text p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .feature-text ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .feature-text ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-secondary);
        }
        .feature-text ul li i {
            color: var(--accent);
            margin-top: 4px;
            flex-shrink: 0;
        }
        @media (max-width: 768px) {
            .feature-row {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .feature-row.reverse {
                direction: ltr;
            }
            .feature-text h3 {
                font-size: 1.3rem;
            }
        }

        /* ===== 辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-12 {
            margin-bottom: 12px;
        }
        .gap-8 {
            gap: 8px;
        }

        /* ===== 滚动动画 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== 返回顶部 ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
            opacity: 0;
            pointer-events: none;
            z-index: 999;
            border: 2px solid rgba(255, 255, 255, 0.15);
        }
        .back-top.show {
            opacity: 1;
            pointer-events: auto;
        }
        .back-top:hover {
            background: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        @media (max-width: 520px) {
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 1rem;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2d4a8e;
            --primary-dark: #0f1a4a;
            --accent: #e8a838;
            --accent-light: #f0c060;
            --accent-dark: #c88a20;
            --bg-body: #f8f9fc;
            --bg-card: #ffffff;
            --bg-dark: #0f1a3a;
            --bg-muted: #eef1f8;
            --text-dark: #1a1a2e;
            --text-main: #2d2d44;
            --text-muted: #6b7280;
            --text-light: #f0f2f8;
            --border: #dce1ec;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(26,42,108,0.06);
            --shadow-md: 0 6px 24px rgba(26,42,108,0.10);
            --shadow-lg: 0 16px 48px rgba(26,42,108,0.14);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --transition: 0.25s ease;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            padding-top: var(--nav-height);
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent); }
        a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        button { cursor: pointer; font-family: inherit; }
        input, button { font-size: 1rem; }
        ul { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 700; }
        h1 { font-size: 2.4rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.4rem; }
        h4 { font-size: 1.15rem; }

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

        /* ===== 导航 ===== */
        .nav {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(255,255,255,0.72);
            backdrop-filter: blur(18px) saturate(180%);
            -webkit-backdrop-filter: blur(18px) saturate(180%);
            border-bottom: 1px solid rgba(26,42,108,0.08);
            box-shadow: 0 2px 20px rgba(26,42,108,0.04);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .nav.scrolled {
            background: rgba(255,255,255,0.94);
            box-shadow: 0 4px 32px rgba(26,42,108,0.10);
        }
        .nav-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            transition: opacity var(--transition);
        }
        .nav-logo i { color: var(--accent); font-size: 1.6rem; }
        .nav-logo:hover { opacity: 0.85; color: var(--primary); }
        .nav-menu { display: flex; align-items: center; gap: 8px; }
        .nav-link {
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-main);
            transition: background var(--transition), color var(--transition);
            position: relative;
        }
        .nav-link:hover { background: var(--bg-muted); color: var(--primary); }
        .nav-link.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(26,42,108,0.20);
        }
        .nav-link.active:hover { background: var(--primary-light); color: #fff; }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--primary);
            padding: 4px 8px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-muted); }

        /* ===== 文章头部 ===== */
        .article-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 70%, var(--primary-light) 100%);
            padding: 60px 0 56px;
            position: relative;
            overflow: hidden;
        }
        .article-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center 30% / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .article-header .container {
            position: relative;
            z-index: 2;
        }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
            margin-bottom: 20px;
        }
        .article-breadcrumb a { color: rgba(255,255,255,0.8); }
        .article-breadcrumb a:hover { color: var(--accent); }
        .article-breadcrumb i { font-size: 0.75rem; color: rgba(255,255,255,0.5); }
        .article-category-badge {
            display: inline-block;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .article-header h1 {
            font-size: 2.6rem;
            color: #fff;
            max-width: 880px;
            line-height: 1.25;
            text-shadow: 0 2px 12px rgba(0,0,0,0.10);
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 28px;
            color: rgba(255,255,255,0.75);
            font-size: 0.95rem;
        }
        .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: 48px 0 64px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 40px 44px;
            border: 1px solid var(--border);
        }
        .article-body p {
            margin-bottom: 1.4em;
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-main);
        }
        .article-body h2, .article-body h3 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
        }
        .article-body h2 { font-size: 1.6rem; border-left: 4px solid var(--accent); padding-left: 16px; }
        .article-body h3 { font-size: 1.25rem; }
        .article-body ul, .article-body ol {
            margin-bottom: 1.4em;
            padding-left: 1.6em;
        }
        .article-body li {
            margin-bottom: 0.5em;
            list-style: disc;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.6em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            background: var(--bg-muted);
            padding: 16px 24px;
            margin: 1.6em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-muted);
            font-style: italic;
        }
        .article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
        .article-body a:hover { color: var(--accent); }

        /* ===== 侧边栏 ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            padding: 28px;
        }
        .sidebar-card h3 {
            font-size: 1.15rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-card h3 i { color: var(--accent); }
        .sidebar-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-main);
            line-height: 1.5;
        }
        .sidebar-list a:hover { color: var(--primary); }
        .sidebar-list i { color: var(--accent); font-size: 0.8rem; margin-top: 4px; }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            border: none;
            padding: 20px 24px;
        }
        .sidebar-cta h3 { color: #fff; }
        .sidebar-cta p { color: rgba(255,255,255,0.8); font-size: 0.95rem; margin-bottom: 16px; }
        .btn-sidebar {
            display: inline-block;
            background: var(--accent);
            color: var(--primary-dark);
            padding: 10px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: background var(--transition), transform var(--transition);
        }
        .btn-sidebar:hover { background: var(--accent-light); color: var(--primary-dark); transform: translateY(-2px); }

        /* ===== 相关文章 ===== */
        .related-section {
            padding: 48px 0 64px;
            background: var(--bg-muted);
        }
        .related-section h2 {
            text-align: center;
            margin-bottom: 36px;
            font-size: 2rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .related-card-img {
            height: 180px;
            background: var(--bg-muted);
            overflow: hidden;
        }
        .related-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
        .related-card:hover .related-card-img img { transform: scale(1.06); }
        .related-card-body {
            padding: 20px 22px 24px;
        }
        .related-card-body .tag {
            display: inline-block;
            background: var(--bg-muted);
            color: var(--primary);
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            margin-bottom: 8px;
        }
        .related-card-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }
        .related-card-body h3 a { color: var(--text-dark); }
        .related-card-body h3 a:hover { color: var(--primary); }
        .related-card-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ===== 按钮通用 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26,42,108,0.20);
        }
        .btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(26,42,108,0.25); color: #fff; }
        .btn-accent {
            background: var(--accent);
            color: var(--primary-dark);
            box-shadow: 0 4px 16px rgba(232,168,56,0.30);
        }
        .btn-accent:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(232,168,56,0.35); color: var(--primary-dark); }

        /* ===== 标签 ===== */
        .tag { display: inline-block; padding: 2px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 500; background: var(--bg-muted); color: var(--primary); }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.75);
            padding: 52px 0 28px;
            border-top: 3px solid var(--accent);
        }
        .footer .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand h3 {
            color: #fff;
            font-size: 1.5rem;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand h3 i { color: var(--accent); }
        .footer-brand p { font-size: 0.95rem; line-height: 1.7; color: rgba(255,255,255,0.65); max-width: 400px; }
        .footer-col h4 {
            color: #fff;
            font-size: 1.05rem;
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0;
            width: 32px; height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.65);
            padding: 5px 0;
            font-size: 0.95rem;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover { color: var(--accent); padding-left: 6px; }
        .footer-social { display: flex; gap: 14px; flex-wrap: wrap; }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px; height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            color: rgba(255,255,255,0.7);
            font-size: 1.2rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
            padding: 0;
        }
        .footer-social a:hover { background: var(--accent); color: var(--primary-dark); transform: translateY(-3px); padding-left: 0; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 22px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: var(--accent); }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .not-found-box i { font-size: 4rem; color: var(--accent); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-muted); margin-bottom: 24px; }
        .not-found-box .btn { margin-top: 8px; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: var(--nav-height);
                left: 0; right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: transform 0.35s ease, opacity 0.25s ease;
                pointer-events: none;
            }
            .nav-menu.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-link { width: 100%; text-align: center; padding: 12px 20px; }
            .nav-toggle { display: block; }
            .article-header h1 { font-size: 1.9rem; }
            .article-body { padding: 28px 20px; }
            .article-layout { gap: 32px; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
        }
        @media (max-width: 520px) {
            .article-header h1 { font-size: 1.5rem; }
            .article-meta { flex-direction: column; gap: 8px; }
            .article-body p { font-size: 1rem; }
            .sidebar-card { padding: 20px; }
            .container { padding: 0 16px; }
        }