/* roulang page: index */
:root {
            --bg-body: #F8F9FA;
            --bg-card: #FFFFFF;
            --primary-blue: #0A58CA;
            --primary-hover: #084298;
            --text-dark: #0F172A;
            --text-slate: #475569;
            --text-muted: #94A3B8;
            --border-color: #E2E8F0;
            --dark-section: #0F172A;
            --dark-border: #334155;
            --accent-green: #10B981;
            --radius-default: 10px;
            --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 30px -4px rgba(15, 23, 42, 0.12);
            --transition-smooth: all 0.25s ease-in-out;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-body);
            color: var(--text-slate);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-dark);
            letter-spacing: -0.02em;
            font-weight: 700;
        }

        a {
            text-decoration: none;
            transition: var(--transition-smooth);
        }

        /* 顶部导航 */
        .site-header {
            background-color: #FFFFFF;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1030;
            box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
        }

        .navbar-brand {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--text-dark) !important;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .nav-link {
            color: var(--text-slate) !important;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 0.9rem !important;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--primary-blue) !important;
        }

        .nav-search-input {
            border-radius: 20px;
            background-color: #F1F5F9;
            border: 1px solid transparent;
            font-size: 0.85rem;
            padding: 0.35rem 1rem;
            color: var(--text-dark);
            min-width: 170px;
        }

        .nav-search-input:focus {
            background-color: #FFFFFF;
            border-color: var(--primary-blue);
            box-shadow: none;
        }

        /* 按钮与徽章 */
        .btn-brand-primary {
            background-color: var(--primary-blue);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 8px;
            padding: 0.6rem 1.4rem;
            border: none;
            transition: var(--transition-smooth);
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn-brand-primary:hover {
            background-color: var(--primary-hover);
            color: #FFFFFF;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(10, 88, 202, 0.25);
        }

        .btn-brand-outline {
            border: 1px solid var(--border-color);
            background: #FFFFFF;
            color: var(--text-dark);
            font-weight: 600;
            border-radius: 8px;
            padding: 0.6rem 1.4rem;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn-brand-outline:hover {
            border-color: var(--primary-blue);
            color: var(--primary-blue);
            transform: translateY(-2px);
        }

        .badge-sub {
            background-color: #EBF3FE;
            color: var(--primary-blue);
            font-weight: 600;
            font-size: 0.8rem;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            display: inline-block;
        }

        /* 卡片公共定义 */
        .glass-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-default);
            box-shadow: var(--shadow-sm);
            transition: var(--transition-smooth);
            height: 100%;
        }

        .glass-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: #CBD5E1;
        }

        .section-py {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }

        .section-header {
            max-width: 800px;
            margin: 0 auto 3.5rem auto;
            text-align: center;
        }

        .section-header h2 {
            font-size: 2.25rem;
            margin-bottom: 1rem;
        }

        .section-header p {
            font-size: 1.05rem;
            color: var(--text-slate);
        }

        /* 模块独立样式 */
        .hero-banner {
            background-color: #FFFFFF;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            padding: 4.5rem 0;
            overflow: hidden;
        }

        .hero-banner .hero-img-wrap {
            border-radius: var(--radius-default);
            box-shadow: var(--shadow-hover);
            border: 1px solid var(--border-color);
            overflow: hidden;
            position: relative;
        }

        .hero-banner .hero-img-wrap img {
            width: 100%;
            height: 420px;
            object-fit: cover;
            display: block;
        }

        .tech-dark-bg {
            background-color: var(--dark-section);
            color: #E2E8F0;
            position: relative;
        }

        .tech-dark-bg h2, .tech-dark-bg h3, .tech-dark-bg h4 {
            color: #FFFFFF;
        }

        .dark-sub-card {
            background: rgba(30, 41, 59, 0.6);
            border: 1px solid var(--dark-border);
            border-radius: var(--radius-default);
            padding: 2rem;
            height: 100%;
        }

        .flow-step-num {
            width: 48px;
            height: 48px;
            background-color: #EBF3FE;
            color: var(--primary-blue);
            font-size: 1.25rem;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.25rem;
        }

        .metric-strip-card {
            border-top: 4px solid var(--primary-blue);
            padding: 2.2rem 1.5rem;
            background: #FFFFFF;
            border-radius: 0 0 var(--radius-default) var(--radius-default);
            box-shadow: var(--shadow-sm);
            text-align: center;
        }

        .metric-strip-card .metric-val {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--primary-blue);
            line-height: 1.1;
            margin-bottom: 0.5rem;
        }

        .benefit-coupon-card {
            border-left: 4px solid var(--accent-green);
            background: #FFFFFF;
            border-radius: var(--radius-default);
            box-shadow: var(--shadow-sm);
            padding: 1.8rem;
        }

        .action-banner-box {
            background: linear-gradient(135deg, #0A58CA 0%, #1E293B 100%);
            border-radius: 16px;
            padding: 3.5rem 2.5rem;
            color: #FFFFFF;
            box-shadow: 0 20px 40px rgba(10, 88, 202, 0.2);
        }

        /* 站点页脚 */
        .site-footer {
            background-color: #0B1120;
            color: #94A3B8;
            border-top: 1px solid #1E293B;
            padding: 4.5rem 0 2rem 0;
            font-size: 0.9rem;
        }

        .site-footer h5 {
            color: #FFFFFF;
            font-size: 1.05rem;
            margin-bottom: 1.2rem;
        }

        .site-footer a {
            color: #94A3B8;
        }

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

        .site-footer .copyright-bar {
            border-top: 1px solid #1E293B;
            margin-top: 3.5rem;
            padding-top: 1.8rem;
        }

        @media (max-width: 991px) {
            .section-py {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
            .hero-banner .hero-img-wrap img {
                height: 280px;
            }
            .section-header h2 {
                font-size: 1.85rem;
            }
        }