/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00f5d4;
            --primary-dark: #00c9b0;
            --primary-glow: rgba(0, 245, 212, 0.3);
            --secondary: #7b2ff7;
            --secondary-glow: rgba(123, 47, 247, 0.3);
            --accent: #f72585;
            --accent-glow: rgba(247, 37, 133, 0.3);
            --bg-dark: #0a0a1a;
            --bg-card: #12122a;
            --bg-card-hover: #1a1a3a;
            --bg-section: #0e0e24;
            --text-primary: #f0f0ff;
            --text-secondary: #b0b0d0;
            --text-muted: #6a6a8a;
            --border-color: rgba(0, 245, 212, 0.15);
            --border-glow: rgba(0, 245, 212, 0.4);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 30px rgba(0, 245, 212, 0.15);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 80px;
        }

        /* ===== 基础重置 ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-dark);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
            text-shadow: 0 0 12px var(--primary-glow);
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
        }

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

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

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(10, 10, 26, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .site-header.scrolled {
            background: rgba(10, 10, 26, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
        }

        .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 {
            font-size: 24px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: 1px;
            text-shadow: 0 0 30px rgba(0, 245, 212, 0.2);
            position: relative;
        }
        .logo::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
            opacity: 0.6;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-list a {
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            position: relative;
            letter-spacing: 0.3px;
        }
        .nav-list a i {
            margin-right: 6px;
            font-size: 14px;
        }
        .nav-list a:hover,
        .nav-list a.active {
            color: var(--primary);
            background: rgba(0, 245, 212, 0.08);
        }
        .nav-list a.active {
            color: var(--primary);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px rgba(0, 245, 212, 0.1);
        }
        .nav-list a.active i {
            color: var(--primary);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px !important;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
            color: #0a0a1a !important;
            font-weight: 700 !important;
            border-radius: var(--radius-sm) !important;
            box-shadow: 0 0 24px rgba(0, 245, 212, 0.25);
            transition: var(--transition) !important;
        }
        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(0, 245, 212, 0.4) !important;
            color: #0a0a1a !important;
            background: linear-gradient(135deg, var(--primary), #00e6c8) !important;
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
        }
        .mobile-toggle span {
            display: block;
            width: 26px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }
        .mobile-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .mobile-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .mobile-toggle {
                display: flex;
            }
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(10, 10, 26, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 32px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-120%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                box-shadow: var(--shadow-lg);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .nav-list a {
                width: 100%;
                padding: 14px 20px;
                font-size: 16px;
                border-radius: var(--radius-sm);
            }
            .nav-list a.nav-cta {
                justify-content: center;
                margin-top: 8px;
                padding: 14px 28px !important;
            }
        }

        /* ===== Hero 首屏 ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 24px 80px;
            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(10, 10, 26, 0.85) 0%, rgba(10, 10, 26, 0.6) 50%, rgba(10, 10, 26, 0.85) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 200px;
            background: linear-gradient(to top, var(--bg-dark), transparent);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            background: rgba(0, 245, 212, 0.1);
            border: 1px solid rgba(0, 245, 212, 0.25);
            border-radius: 50px;
            font-size: 14px;
            color: var(--primary);
            margin-bottom: 24px;
            letter-spacing: 0.5px;
        }
        .hero-badge i {
            font-size: 14px;
        }

        .hero h1 {
            font-size: clamp(40px, 7vw, 72px);
            font-weight: 900;
            line-height: 1.1;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff 0%, var(--primary) 50%, var(--secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }

        .hero p {
            font-size: clamp(16px, 2vw, 22px);
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            align-items: center;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0a0a1a;
            font-weight: 700;
            font-size: 17px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 30px rgba(0, 245, 212, 0.3);
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 50px rgba(0, 245, 212, 0.5);
            color: #0a0a1a;
        }
        .btn-primary i {
            font-size: 18px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 17px;
            border-radius: var(--radius-sm);
            border: 2px solid var(--border-color);
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 0 30px rgba(0, 245, 212, 0.1);
            transform: translateY(-3px);
        }
        .btn-secondary i {
            font-size: 18px;
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: center;
            margin-top: 60px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat-item {
            text-align: center;
        }
        .hero-stat-item .number {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            display: block;
            text-shadow: 0 0 30px rgba(0, 245, 212, 0.2);
        }
        .hero-stat-item .label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
            letter-spacing: 0.5px;
        }

        @media (max-width: 768px) {
            .hero {
                padding: 100px 16px 60px;
                min-height: auto;
            }
            .hero h1 {
                font-size: 34px;
            }
            .hero p {
                font-size: 16px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                gap: 24px;
                margin-top: 40px;
                padding-top: 28px;
            }
            .hero-stat-item .number {
                font-size: 28px;
            }
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 100px 0;
            position: relative;
        }

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

        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: rgba(0, 245, 212, 0.08);
            border: 1px solid rgba(0, 245, 212, 0.15);
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .section-header h2 {
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-header p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .section {
                padding: 60px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .section-header p {
                font-size: 15px;
            }
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: var(--transition);
        }
        .card:hover {
            border-color: rgba(0, 245, 212, 0.3);
            transform: translateY(-6px);
            box-shadow: var(--shadow-glow), var(--shadow-md);
            background: var(--bg-card-hover);
        }
        .card:hover::before {
            opacity: 1;
        }

        .card .icon-wrap {
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 245, 212, 0.1);
            border-radius: var(--radius-sm);
            margin-bottom: 20px;
            font-size: 26px;
            color: var(--primary);
            border: 1px solid rgba(0, 245, 212, 0.15);
        }
        .card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .card p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-weight: 600;
            font-size: 14px;
            color: var(--primary);
        }
        .card .card-link i {
            font-size: 12px;
            transition: var(--transition);
        }
        .card .card-link:hover i {
            transform: translateX(4px);
        }

        @media (max-width: 520px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card {
                padding: 24px 20px;
            }
        }

        /* ===== 分类卡片（带封面） ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            cursor: pointer;
            display: block;
            color: inherit;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-glow), var(--shadow-md);
            border-color: rgba(0, 245, 212, 0.3);
            color: inherit;
        }
        .category-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
            border-bottom: 1px solid var(--border-color);
        }
        .category-card .card-body {
            padding: 20px 24px 24px;
        }
        .category-card .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .category-card .card-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .category-card .card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0, 245, 212, 0.1);
            border: 1px solid rgba(0, 245, 212, 0.15);
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            margin-top: 12px;
        }

        @media (max-width: 520px) {
            .category-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 内容列表（CMS） ===== */
        .content-list {
            display: grid;
            gap: 20px;
        }

        .content-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            padding: 20px 24px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .content-item:hover {
            border-color: rgba(0, 245, 212, 0.25);
            box-shadow: var(--shadow-glow);
            background: var(--bg-card-hover);
        }
        .content-item .item-index {
            width: 40px;
            height: 40px;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 245, 212, 0.08);
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 16px;
            color: var(--primary);
            border: 1px solid rgba(0, 245, 212, 0.15);
        }
        .content-item .item-body {
            flex: 1;
            min-width: 0;
        }
        .content-item .item-body h4 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .content-item .item-body h4 a {
            color: var(--text-primary);
            transition: var(--transition);
        }
        .content-item .item-body h4 a:hover {
            color: var(--primary);
        }
        .content-item .item-body .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .content-item .item-body .meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .content-item .item-body .meta i {
            font-size: 12px;
            color: var(--primary);
        }
        .content-item .item-body .summary {
            margin-top: 8px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        @media (max-width: 640px) {
            .content-item {
                flex-direction: column;
                padding: 16px 18px;
                gap: 12px;
            }
            .content-item .item-index {
                width: 32px;
                height: 32px;
                font-size: 14px;
            }
            .content-item .item-body h4 {
                font-size: 15px;
            }
        }

        /* ===== 数据/流程区 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 28px;
            counter-reset: step;
        }

        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            border-color: rgba(0, 245, 212, 0.25);
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow);
        }
        .step-card .step-number {
            width: 56px;
            height: 56px;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(0, 245, 212, 0.15), rgba(123, 47, 247, 0.15));
            border: 1px solid rgba(0, 245, 212, 0.2);
            border-radius: 50%;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            counter-increment: step;
        }
        .step-card .step-number::after {
            content: counter(step);
        }
        .step-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: grid;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 245, 212, 0.2);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            background: none;
            border: none;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 16px;
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        @media (max-width: 640px) {
            .faq-question {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 18px 16px;
                font-size: 14px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 245, 212, 0.05), rgba(123, 47, 247, 0.05));
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at center, rgba(0, 245, 212, 0.03), transparent 70%);
            animation: ctaGlow 8s ease-in-out infinite alternate;
        }
        @keyframes ctaGlow {
            0% {
                transform: translate(0, 0);
            }
            100% {
                transform: translate(10%, 10%);
            }
        }
        .cta-section h2 {
            font-size: clamp(26px, 3.5vw, 38px);
            font-weight: 800;
            margin-bottom: 16px;
            position: relative;
        }
        .cta-section p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 520px;
            margin: 0 auto 28px;
            position: relative;
        }
        .cta-section .btn-primary {
            position: relative;
        }

        @media (max-width: 768px) {
            .cta-section {
                padding: 40px 24px;
            }
            .cta-section p {
                font-size: 15px;
            }
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-section);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand .logo {
            font-size: 22px;
            display: inline-block;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 15px;
            background: var(--bg-card);
            border: 1px dashed var(--border-color);
            border-radius: var(--radius-sm);
        }
        .empty-state i {
            font-size: 36px;
            color: var(--text-muted);
            margin-bottom: 12px;
            display: block;
            opacity: 0.5;
        }

        /* ===== 辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .gap-16 {
            gap: 16px;
        }

        .divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 3px;
            margin: 0 auto 20px;
        }

        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== 选择文本 ===== */
        ::selection {
            background: rgba(0, 245, 212, 0.3);
            color: #fff;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #f0c040;
            --primary-hover: #ffd866;
            --primary-glow: rgba(240, 192, 64, 0.35);
            --secondary: #ff6b35;
            --secondary-hover: #ff8555;
            --bg-dark: #0b0d14;
            --bg-card: #12161f;
            --bg-elevated: #1a1f2e;
            --bg-input: #1e2538;
            --text-main: #eaeef5;
            --text-secondary: #9aa6b8;
            --text-weak: #5f6b80;
            --border-color: #2a3142;
            --border-glow: rgba(240, 192, 64, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 30px rgba(240, 192, 64, 0.08);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --header-h: 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);
            background: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
        }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(11, 13, 20, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
        }
        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: 1px;
            text-shadow: 0 0 20px var(--primary-glow);
            white-space: nowrap;
        }
        .logo i {
            margin-right: 8px;
            color: var(--secondary);
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav-list a i {
            font-size: 0.9rem;
        }
        .nav-list a:hover {
            color: var(--text-main);
            background: rgba(240, 192, 64, 0.06);
        }
        .nav-list a.active {
            color: var(--primary);
            background: rgba(240, 192, 64, 0.1);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px rgba(240, 192, 64, 0.06);
        }
        .nav-list a.nav-cta {
            background: linear-gradient(135deg, var(--primary), #e0a800);
            color: #0b0d14;
            font-weight: 700;
            padding: 8px 24px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 20px rgba(240, 192, 64, 0.2);
        }
        .nav-list a.nav-cta:hover {
            background: linear-gradient(135deg, var(--primary-hover), #f0c040);
            transform: translateY(-1px);
            box-shadow: 0 4px 28px rgba(240, 192, 64, 0.35);
            color: #0b0d14;
        }
        .nav-toggle {
            display: none;
            font-size: 1.6rem;
            color: var(--text-main);
            background: none;
            border: none;
            padding: 4px 8px;
            cursor: pointer;
            transition: var(--transition);
        }
        .nav-toggle:hover {
            color: var(--primary);
        }

        @media (max-width: 900px) {
            .nav-list {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(11, 13, 20, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 30px;
                gap: 4px;
                border-bottom: 2px solid var(--border-color);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 18px;
                font-size: 1rem;
                justify-content: flex-start;
                border-radius: var(--radius-sm);
            }
            .nav-list a.nav-cta {
                margin-top: 10px;
                justify-content: center;
            }
            .nav-toggle {
                display: block;
            }
        }
        @media (max-width: 520px) {
            .logo {
                font-size: 1.2rem;
            }
            .header-inner {
                padding: 0 12px;
            }
        }

        /* ===== Page Banner ===== */
        .page-banner {
            margin-top: var(--header-h);
            padding: 80px 0 60px;
            background: linear-gradient(160deg, #0e121e 0%, #141a2a 50%, #0b0d14 100%);
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: screen;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(240, 192, 64, 0.05), transparent 70%);
            pointer-events: none;
        }
        .banner-content {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .banner-content .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            font-size: 0.85rem;
            color: var(--text-weak);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .banner-content .breadcrumb a {
            color: var(--text-secondary);
        }
        .banner-content .breadcrumb a:hover {
            color: var(--primary);
        }
        .banner-content .breadcrumb span {
            color: var(--primary);
        }
        .banner-content h1 {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: 1px;
        }
        .banner-content h1 i {
            color: var(--primary);
            margin-right: 12px;
        }
        .banner-content p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.8;
        }
        @media (max-width: 768px) {
            .page-banner {
                padding: 60px 0 40px;
            }
            .banner-content h1 {
                font-size: 2rem;
            }
            .banner-content p {
                font-size: 1rem;
            }
        }
        @media (max-width: 520px) {
            .banner-content h1 {
                font-size: 1.6rem;
            }
            .banner-content .breadcrumb {
                font-size: 0.75rem;
                gap: 6px;
            }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--bg-card);
        }
        .section-divider {
            border-top: 1px solid var(--border-color);
        }
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }
        .section-header h2 i {
            color: var(--primary);
            margin-right: 10px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto;
        }
        .section-sub {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 8px;
            border: 1px solid rgba(240, 192, 64, 0.2);
            padding: 4px 16px;
            border-radius: 20px;
            background: rgba(240, 192, 64, 0.04);
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .section-header p {
                font-size: 0.95rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ===== Card Base ===== */
        .card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card:hover {
            border-color: rgba(240, 192, 64, 0.2);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), var(--shadow-glow);
        }
        .card .card-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 16px;
            display: inline-block;
        }
        .card h3 {
            font-size: 1.3rem;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            background: rgba(240, 192, 64, 0.1);
            color: var(--primary);
            border: 1px solid rgba(240, 192, 64, 0.15);
            margin-top: 12px;
        }

        /* ===== Guide Grid ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        @media (max-width: 620px) {
            .guide-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Step Flow ===== */
        .step-flow {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            counter-reset: step;
        }
        .step-item {
            flex: 1 1 180px;
            max-width: 220px;
            text-align: center;
            padding: 28px 16px 20px;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            position: relative;
            transition: var(--transition);
        }
        .step-item:hover {
            border-color: rgba(240, 192, 64, 0.25);
            transform: translateY(-4px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary), #e0a800);
            color: #0b0d14;
            font-weight: 800;
            font-size: 0.9rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 24px rgba(240, 192, 64, 0.25);
        }
        .step-item .step-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 10px;
            display: block;
        }
        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 6px;
            color: var(--text-main);
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 700px) {
            .step-item {
                flex: 1 1 140px;
                max-width: 160px;
                padding: 24px 12px 16px;
            }
            .step-item h4 {
                font-size: 0.95rem;
            }
            .step-item p {
                font-size: 0.8rem;
            }
        }
        @media (max-width: 480px) {
            .step-flow {
                gap: 14px;
            }
            .step-item {
                flex: 1 1 100%;
                max-width: 100%;
                padding: 22px 16px 16px;
            }
        }

        /* ===== Feature List ===== */
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 20px;
        }
        .feature-item {
            display: flex;
            gap: 18px;
            align-items: flex-start;
            padding: 20px 22px;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: var(--transition);
        }
        .feature-item:hover {
            border-color: rgba(240, 192, 64, 0.15);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
        }
        .feature-item .fi-icon {
            font-size: 1.6rem;
            color: var(--primary);
            min-width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(240, 192, 64, 0.06);
            border-radius: var(--radius-sm);
            border: 1px solid rgba(240, 192, 64, 0.08);
        }
        .feature-item .fi-text h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .feature-item .fi-text p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .feature-list {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(240, 192, 64, 0.12);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .faq-toggle {
            font-size: 1.2rem;
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-toggle {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        @media (max-width: 600px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 0.85rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(160deg, #141a2a, #1a2238);
            border: 1px solid rgba(240, 192, 64, 0.12);
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.04;
            mix-blend-mode: screen;
        }
        .cta-block h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            position: relative;
            z-index: 2;
        }
        .cta-block p {
            color: var(--text-secondary);
            max-width: 540px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
            line-height: 1.7;
            position: relative;
            z-index: 2;
        }
        .cta-block .btn {
            position: relative;
            z-index: 2;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--primary), #e0a800);
            color: #0b0d14;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            box-shadow: 0 0 30px rgba(240, 192, 64, 0.15);
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-hover), #f0c040);
            transform: translateY(-2px);
            box-shadow: 0 8px 36px rgba(240, 192, 64, 0.3);
            color: #0b0d14;
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-weight: 500;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            background: transparent;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 0 24px rgba(240, 192, 64, 0.04);
        }
        .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
            position: relative;
            z-index: 2;
        }
        @media (max-width: 600px) {
            .cta-block {
                padding: 36px 20px;
            }
            .cta-block h2 {
                font-size: 1.4rem;
            }
            .cta-block p {
                font-size: 0.92rem;
            }
            .btn-primary {
                padding: 12px 28px;
                font-size: 0.92rem;
            }
        }

        /* ===== Cover Card ===== */
        .cover-card {
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            box-shadow: var(--shadow-card);
        }
        .cover-card:hover {
            border-color: rgba(240, 192, 64, 0.2);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
        }
        .cover-card .cover-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
            border-bottom: 1px solid var(--border-color);
        }
        .cover-card .cover-body {
            padding: 20px 22px 24px;
        }
        .cover-card .cover-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .cover-card .cover-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .cover-card .cover-body .tag {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            background: rgba(240, 192, 64, 0.08);
            color: var(--primary);
            border: 1px solid rgba(240, 192, 64, 0.1);
        }
        .cover-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        @media (max-width: 620px) {
            .cover-grid {
                grid-template-columns: 1fr;
            }
            .cover-card .cover-body {
                padding: 16px 16px 20px;
            }
        }

        /* ===== Stats Row ===== */
        .stats-row {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
        }
        .stat-item {
            flex: 1 1 160px;
            max-width: 200px;
            text-align: center;
            padding: 24px 16px;
            background: var(--bg-elevated);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: var(--transition);
        }
        .stat-item:hover {
            border-color: rgba(240, 192, 64, 0.12);
            transform: translateY(-2px);
        }
        .stat-item .stat-num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
        @media (max-width: 520px) {
            .stat-item {
                flex: 1 1 120px;
                max-width: 140px;
                padding: 18px 10px;
            }
            .stat-item .stat-num {
                font-size: 1.8rem;
            }
            .stat-item .stat-label {
                font-size: 0.75rem;
            }
        }

        /* ===== Table ===== */
        .guide-table-wrap {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            background: var(--bg-elevated);
        }
        .guide-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
            min-width: 600px;
        }
        .guide-table th {
            background: rgba(240, 192, 64, 0.06);
            color: var(--primary);
            font-weight: 700;
            padding: 14px 18px;
            text-align: left;
            border-bottom: 2px solid rgba(240, 192, 64, 0.1);
        }
        .guide-table td {
            padding: 12px 18px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-secondary);
        }
        .guide-table tr:last-child td {
            border-bottom: none;
        }
        .guide-table tr:hover td {
            background: rgba(240, 192, 64, 0.02);
        }
        .guide-table .highlight {
            color: var(--primary);
            font-weight: 600;
        }
        @media (max-width: 600px) {
            .guide-table {
                font-size: 0.8rem;
                min-width: 480px;
            }
            .guide-table th,
            .guide-table td {
                padding: 10px 12px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #080a12;
            border-top: 1px solid var(--border-color);
            padding: 50px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .logo {
            font-size: 1.4rem;
            margin-bottom: 14px;
            display: inline-block;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: 1px;
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: var(--text-secondary);
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--text-weak);
        }
        .footer-bottom a {
            color: var(--text-secondary);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: 36px 0 20px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-weak);
        }

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

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

/* roulang page: article */
/* ===== :root 设计变量 ===== */
:root {
  --primary: #f0b90b;
  --primary-light: #fcdb5e;
  --primary-dark: #c99a08;
  --secondary: #1a1f2e;
  --accent: #ff6b35;
  --bg-dark: #0b0e14;
  --bg-card: #131822;
  --bg-section: #0f141c;
  --bg-input: #1c2433;
  --text-light: #f0f4fa;
  --text-muted: #8a94a6;
  --text-dim: #5a6478;
  --border-color: #2a3346;
  --border-glow: rgba(240, 185, 11, 0.25);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.45), 0 0 0 1px rgba(240,185,11,0.06);
  --shadow-glow: 0 0 40px rgba(240,185,11,0.08);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 1200px;
  --header-height: 72px;
}

/* ===== 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-light);
  background: var(--bg-dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--text-light); }
h1 { font-size: 2.4rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }
p { margin-bottom: 1em; color: var(--text-muted); }
p:last-child { margin-bottom: 0; }
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }

/* ===== Header / Nav ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-height);
  background: rgba(11, 14, 20, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 24px;
}
.logo {
  font-size: 1.5rem; font-weight: 800; letter-spacing: 1px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; text-shadow: 0 0 30px rgba(240,185,11,0.2);
  white-space: nowrap;
}
.logo i { margin-right: 6px; }
.nav-list { display: flex; align-items: center; gap: 8px; }
.nav-list a {
  position: relative; padding: 8px 18px; border-radius: var(--radius-sm);
  color: var(--text-muted); font-size: 0.9rem; font-weight: 500;
  transition: var(--transition); white-space: nowrap;
}
.nav-list a i { margin-right: 6px; font-size: 0.85rem; }
.nav-list a:hover { color: var(--text-light); background: rgba(240,185,11,0.08); }
.nav-list a.active {
  color: var(--primary); background: rgba(240,185,11,0.12);
  box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px rgba(240,185,11,0.06);
}
.nav-list a.active::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 60%; height: 2px; background: var(--primary);
  border-radius: 2px; box-shadow: 0 0 12px var(--primary);
}
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
  color: #0b0e14 !important; font-weight: 700 !important; padding: 8px 24px !important;
  border-radius: var(--radius-sm) !important; box-shadow: 0 4px 20px rgba(240,185,11,0.25);
  transition: var(--transition); margin-left: 8px;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(240,185,11,0.35) !important; color: #0b0e14 !important; }
.nav-toggle { display: none; background: none; color: var(--text-light); font-size: 1.6rem; cursor: pointer; padding: 4px 8px; border-radius: var(--radius-sm); }

/* ===== Article Hero ===== */
.article-hero {
  margin-top: var(--header-height);
  padding: 80px 0 60px;
  background: linear-gradient(135deg, var(--bg-section) 0%, #0b0e14 100%);
  border-bottom: 1px solid var(--border-color);
  position: relative; overflow: hidden;
}
.article-hero::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-2.png') center / cover no-repeat;
  opacity: 0.08; pointer-events: none;
}
.article-hero .container { position: relative; z-index: 1; }
.article-breadcrumb {
  display: flex; align-items: center; gap: 10px; margin-bottom: 24px;
  font-size: 0.85rem; color: var(--text-dim);
}
.article-breadcrumb a { color: var(--text-muted); }
.article-breadcrumb a:hover { color: var(--primary); }
.article-breadcrumb span { color: var(--text-dim); }
.article-hero h1 {
  font-size: 2.6rem; max-width: 900px; margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-light) 60%, var(--primary-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1.25;
}
.article-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 20px;
  font-size: 0.9rem; color: var(--text-dim); margin-bottom: 10px;
}
.article-meta .badge {
  display: inline-block; padding: 4px 16px; border-radius: 20px;
  background: rgba(240,185,11,0.15); color: var(--primary); font-size: 0.8rem; font-weight: 600;
  border: 1px solid rgba(240,185,11,0.2);
}
.article-meta i { margin-right: 5px; color: var(--primary); opacity: 0.6; }

/* ===== Article Main ===== */
.article-main {
  padding: 60px 0 80px;
  background: var(--bg-dark);
}
.article-layout {
  display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: start;
}
.article-body {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 48px; border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
}
.article-body h2 { font-size: 1.7rem; margin-top: 2em; margin-bottom: 0.8em; color: var(--text-light); }
.article-body h3 { font-size: 1.25rem; margin-top: 1.6em; margin-bottom: 0.6em; color: var(--text-light); }
.article-body p { margin-bottom: 1.2em; color: var(--text-muted); line-height: 1.8; }
.article-body ul, .article-body ol { margin-bottom: 1.2em; padding-left: 1.6em; color: var(--text-muted); }
.article-body li { margin-bottom: 0.5em; list-style: disc; }
.article-body a { color: var(--primary); border-bottom: 1px solid transparent; }
.article-body a:hover { border-bottom-color: var(--primary); }
.article-body blockquote {
  border-left: 4px solid var(--primary); padding: 16px 24px; margin: 1.5em 0;
  background: rgba(240,185,11,0.05); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted); font-style: italic;
}
.article-body img { border-radius: var(--radius-md); margin: 1.5em 0; width: 100%; }
.article-body .article-cover-img { border-radius: var(--radius-md); margin-bottom: 2em; width: 100%; max-height: 480px; object-fit: cover; }

/* ===== Sidebar ===== */
.article-sidebar { display: flex; flex-direction: column; gap: 32px; }
.sidebar-card {
  background: var(--bg-card); border-radius: var(--radius-md);
  padding: 28px; border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}
.sidebar-card h3 {
  font-size: 1.1rem; margin-bottom: 18px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color); color: var(--text-light);
  display: flex; align-items: center; gap: 10px;
}
.sidebar-card h3 i { color: var(--primary); }
.sidebar-list a {
  display: flex; align-items: center; gap: 12px; padding: 12px 0;
  border-bottom: 1px solid rgba(42,51,70,0.5); color: var(--text-muted); font-size: 0.9rem;
  transition: var(--transition);
}
.sidebar-list a:last-child { border-bottom: none; }
.sidebar-list a:hover { color: var(--primary); padding-left: 6px; }
.sidebar-list a i { color: var(--primary); font-size: 0.75rem; opacity: 0.6; }
.sidebar-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #0b0e14; font-weight: 700; padding: 14px 28px; border-radius: var(--radius-sm);
  text-align: center; display: block; transition: var(--transition);
  box-shadow: 0 4px 24px rgba(240,185,11,0.2);
}
.sidebar-cta:hover { transform: translateY(-3px); box-shadow: 0 8px 40px rgba(240,185,11,0.3); color: #0b0e14; }
.sidebar-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.sidebar-tags a {
  padding: 5px 14px; border-radius: 20px; background: rgba(240,185,11,0.08);
  border: 1px solid rgba(240,185,11,0.12); color: var(--text-muted); font-size: 0.8rem;
  transition: var(--transition);
}
.sidebar-tags a:hover { background: rgba(240,185,11,0.16); color: var(--primary); }

/* ===== Not Found ===== */
.not-found-box {
  text-align: center; padding: 80px 20px;
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border-color); box-shadow: var(--shadow-card);
}
.not-found-box i { font-size: 4rem; color: var(--text-dim); margin-bottom: 24px; }
.not-found-box h2 { font-size: 1.8rem; margin-bottom: 16px; }
.not-found-box p { color: var(--text-muted); margin-bottom: 24px; }
.not-found-box .btn-back {
  display: inline-block; padding: 12px 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #0b0e14; font-weight: 700; border-radius: var(--radius-sm);
  transition: var(--transition); box-shadow: 0 4px 20px rgba(240,185,11,0.2);
}
.not-found-box .btn-back:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(240,185,11,0.3); color: #0b0e14; }

/* ===== Footer ===== */
.site-footer {
  background: var(--secondary); border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand .logo { margin-bottom: 16px; display: inline-block; }
.footer-brand p { font-size: 0.9rem; color: var(--text-dim); max-width: 360px; line-height: 1.7; }
.footer-col h4 { font-size: 1rem; margin-bottom: 18px; color: var(--text-light); }
.footer-col a { display: block; padding: 6px 0; color: var(--text-dim); font-size: 0.9rem; transition: var(--transition); }
.footer-col a:hover { color: var(--primary); padding-left: 6px; }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.85rem; color: var(--text-dim);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-hero h1 { font-size: 2.2rem; }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-list { display: none; flex-direction: column; position: absolute; top: var(--header-height); left: 0; right: 0; background: rgba(11,14,20,0.98); backdrop-filter: blur(18px); padding: 16px 24px; border-bottom: 1px solid var(--border-color); gap: 4px; }
  .nav-list.open { display: flex; }
  .nav-list a { padding: 12px 16px; width: 100%; }
  .nav-cta { margin-left: 0; margin-top: 4px; text-align: center; }
  .article-hero { padding: 60px 0 40px; }
  .article-hero h1 { font-size: 1.8rem; }
  .article-body { padding: 24px; }
  .article-meta { gap: 12px; font-size: 0.8rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .article-hero h1 { font-size: 1.4rem; }
  .article-body { padding: 16px; }
  .article-body h2 { font-size: 1.3rem; }
  .article-body h3 { font-size: 1.1rem; }
  .article-meta { flex-direction: column; align-items: flex-start; gap: 8px; }
  .sidebar-card { padding: 20px; }
  .container { padding: 0 16px; }
  .site-footer { padding: 40px 0 24px; }
}