/* roulang page: index */
:root {
            --primary: #1B5BFF;
            --primary-dark: #0040E0;
            --accent: #00D287;
            --bg-light: #F8FAFC;
            --bg-white: #FFFFFF;
            --bg-dark: #0B132B;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-pill: 9999px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 30px -4px rgba(27, 91, 255, 0.12);
            --shadow-dark: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-body);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.25s ease;
        }

        /* 顶部双行导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1030;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
        }

        .nav-top-bar {
            padding: 10px 0;
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
        }

        .brand-text {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .search-badge-form {
            position: relative;
            max-width: 320px;
            width: 100%;
        }

        .search-badge-form input {
            border-radius: var(--radius-pill);
            padding: 6px 16px 6px 36px;
            font-size: 0.875rem;
            border: 1px solid var(--border-color);
            background: #F1F5F9;
        }

        .search-badge-form .bi-search {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        .chip-nav-wrapper {
            overflow-x: auto;
            white-space: nowrap;
            padding: 8px 0;
            -ms-overflow-style: none;
            scrollbar-width: none;
            scroll-behavior: smooth;
        }

        .chip-nav-wrapper::-webkit-scrollbar {
            display: none;
        }

        .nav-chip {
            display: inline-block;
            padding: 6px 16px;
            margin-right: 8px;
            border-radius: var(--radius-pill);
            background: #F1F5F9;
            color: var(--text-muted);
            font-size: 0.875rem;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .nav-chip:hover, .nav-chip.active {
            background: var(--primary);
            color: #FFFFFF;
            box-shadow: 0 4px 10px rgba(27, 91, 255, 0.25);
        }

        /* 统一大板块结构 */
        section {
            padding: 70px 0;
            position: relative;
        }

        .bg-surface-white {
            background-color: var(--bg-white);
        }

        .bg-surface-slate {
            background-color: var(--bg-light);
        }

        .section-header {
            margin-bottom: 45px;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            background: rgba(27, 91, 255, 0.08);
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-heading);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto;
        }

        /* 卡片基础系统 */
        .app-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
            transition: transform 0.3s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.3s ease;
            height: 100%;
            overflow: hidden;
        }

        .app-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(27, 91, 255, 0.25);
        }

        /* 按钮与交互徽章 */
        .btn-sport-primary {
            background: var(--primary);
            color: #FFFFFF;
            border-radius: var(--radius-pill);
            padding: 10px 24px;
            font-weight: 600;
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 12px rgba(27, 91, 255, 0.25);
        }

        .btn-sport-primary:hover, .btn-sport-primary:focus {
            background: var(--primary-dark);
            color: #FFFFFF;
            transform: translateY(-1px);
        }

        .btn-sport-accent {
            background: var(--accent);
            color: #0F172A;
            border-radius: var(--radius-pill);
            padding: 10px 24px;
            font-weight: 700;
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-sport-accent:hover {
            background: #00bc79;
            color: #0F172A;
        }

        /* 1. Hero 区域：文档帮助中心形态 */
        .hero-section {
            padding-top: 170px;
            padding-bottom: 80px;
            background: linear-gradient(180deg, #EDF2FE 0%, var(--bg-light) 100%);
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }

        .hero-search-box {
            max-width: 680px;
            margin: 0 auto;
            position: relative;
            box-shadow: 0 10px 25px -5px rgba(27, 91, 255, 0.1);
            border-radius: var(--radius-pill);
        }

        .hero-search-box input {
            height: 56px;
            border-radius: var(--radius-pill);
            padding-left: 54px;
            padding-right: 130px;
            font-size: 1rem;
            border: 2px solid #D6E4FF;
        }

        .hero-search-box .bi-search {
            position: absolute;
            left: 20px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.25rem;
            color: var(--primary);
        }

        .hero-search-box button {
            position: absolute;
            right: 6px;
            top: 6px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-pill);
        }

        .hot-chips-list {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .hot-chip-item {
            font-size: 0.85rem;
            padding: 4px 14px;
            border-radius: var(--radius-pill);
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            color: var(--text-body);
        }

        .hot-chip-item:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        /* 2. 指标看板 */
        .metric-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-subtle);
        }

        .metric-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -1px;
            line-height: 1.1;
        }

        /* 深色对比理念区 */
        .bg-tactical-dark {
            background-color: var(--bg-dark);
            color: #E2E8F0;
        }

        .bg-tactical-dark .section-title {
            color: #FFFFFF;
        }

        .dark-tactical-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 30px;
            backdrop-filter: blur(8px);
        }

        /* 表格样式 */
        .comparison-table-wrapper {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: var(--shadow-subtle);
        }

        .table-custom th {
            background: #F1F5F9;
            color: var(--text-heading);
            padding: 16px 20px;
            font-weight: 700;
        }

        .table-custom td {
            padding: 16px 20px;
            vertical-align: middle;
            color: var(--text-body);
            border-bottom: 1px solid var(--border-color);
        }

        /* 时间轴 */
        .timeline-step-box {
            position: relative;
            padding-left: 28px;
            border-left: 2px dashed #CBD5E1;
            margin-bottom: 30px;
        }

        .timeline-step-box::before {
            content: '';
            position: absolute;
            left: -7px;
            top: 4px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
        }

        /* 会员权益网格 */
        .vip-tier-card {
            border: 2px solid transparent;
            position: relative;
        }

        .vip-tier-card.featured {
            border-color: var(--primary);
            box-shadow: 0 10px 30px -5px rgba(27, 91, 255, 0.15);
        }

        .badge-recommend {
            position: absolute;
            top: -12px;
            right: 24px;
            background: var(--accent);
            color: #0F172A;
            font-size: 0.75rem;
            font-weight: 800;
            padding: 2px 10px;
            border-radius: var(--radius-pill);
        }

        /* 页脚 */
        .site-footer {
            background: #090E1F;
            color: #94A3B8;
            padding: 60px 0 25px;
            border-top: 1px solid #1E293B;
        }

        .site-footer h6 {
            color: #FFFFFF;
            font-weight: 700;
            margin-bottom: 18px;
        }

        .footer-links-list li {
            margin-bottom: 8px;
        }

        .footer-links-list a:hover {
            color: #FFFFFF;
        }

        @media (max-width: 991px) {
            .section-title {
                font-size: 1.65rem;
            }
            .hero-section {
                padding-top: 150px;
                padding-bottom: 60px;
            }
        }