/* roulang page: index */
:root {
            --primary: #4F46E5;
            --primary-hover: #4338CA;
            --primary-light: #6366F1;
            --accent: #10B981;
            --accent-dark: #059669;
            --dark: #0F172A;
            --dark-card: #1E293B;
            --text-main: #0F172A;
            --text-muted: #475569;
            --text-sub: #94A3B8;
            --bg-body: #F8FAFC;
            --bg-white: #FFFFFF;
            --border-color: #E2E8F0;
            --radius-default: 12px;
            --radius-pill: 50px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 30px -4px rgba(79, 70, 229, 0.12);
            --transition: all 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            line-height: 1.75;
            overflow-x: hidden;
        }

        p {
            margin-bottom: 1.25rem;
        }

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

        /* 顶部两行导航样式 */
        .top-info-bar {
            background-color: #F1F5F9;
            font-size: 13px;
            color: var(--text-muted);
            border-bottom: 1px solid var(--border-color);
        }
        
        .main-navbar {
            background-color: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .brand-logo {
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .brand-logo:hover {
            color: var(--primary-hover);
        }

        .navbar-nav .nav-link {
            font-weight: 500;
            color: var(--text-muted);
            padding: 0.6rem 1rem;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--primary);
        }

        /* 按钮与组件 */
        .btn-brand-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.6rem;
            font-weight: 600;
            border: 1px solid var(--primary);
            transition: var(--transition);
        }
        .btn-brand-primary:hover {
            background-color: var(--primary-hover);
            color: #FFFFFF;
            box-shadow: 0 4px 15px rgba(79, 70, 229, 0.35);
            transform: translateY(-1px);
        }

        .btn-brand-outline {
            border: 1px solid var(--border-color);
            background: #FFFFFF;
            color: var(--text-main);
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.6rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-brand-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background-color: #F8FAFC;
        }

        .btn-brand-accent {
            background-color: var(--accent);
            color: #FFFFFF;
            border-radius: var(--radius-pill);
            padding: 0.65rem 1.6rem;
            font-weight: 600;
            border: none;
            transition: var(--transition);
        }
        .btn-brand-accent:hover {
            background-color: var(--accent-dark);
            color: #FFFFFF;
            transform: translateY(-1px);
        }

        .section-tag {
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 1.5px;
            color: var(--primary);
            text-transform: uppercase;
            display: inline-block;
            margin-bottom: 0.5rem;
        }

        /* 板块通用间距与背景 */
        section {
            padding: 90px 0;
            position: relative;
        }

        @media (max-width: 991px) {
            section {
                padding: 60px 0;
            }
        }

        .bg-surface-white {
            background-color: var(--bg-white);
        }
        .bg-surface-light {
            background-color: var(--bg-body);
        }
        .bg-surface-dark {
            background-color: var(--dark);
            color: #F8FAFC;
        }
        .bg-surface-dark h2, .bg-surface-dark h3, .bg-surface-dark h4 {
            color: #FFFFFF;
        }
        .bg-surface-dark p {
            color: #94A3B8;
        }

        /* Hero 轮播定制 */
        .hero-banner-item {
            min-height: 580px;
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            position: relative;
        }
        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(90deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.72) 60%, rgba(15, 23, 42, 0.4) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }

        /* 卡片基础重写 */
        .feature-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-default);
            padding: 2rem;
            transition: var(--transition);
            box-shadow: var(--shadow-subtle);
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary-light);
            box-shadow: var(--shadow-hover);
        }

        /* 优惠券墙样式 */
        .coupon-box {
            background: linear-gradient(135deg, #EEF2FF 0%, #FFFFFF 100%);
            border: 2px dashed #C7D2FE;
            border-radius: var(--radius-default);
            padding: 1.5rem;
            position: relative;
            transition: var(--transition);
        }
        .coupon-box:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
        }
        .coupon-amount {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
        }

        /* 深色案例卡片 */
        .dark-case-card {
            background-color: var(--dark-card);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-default);
            overflow: hidden;
            transition: var(--transition);
        }
        .dark-case-card:hover {
            border-color: var(--accent);
            transform: translateY(-5px);
        }

        /* 流程步进条 */
        .step-node {
            position: relative;
            padding: 1.5rem;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-default);
        }
        .step-number {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: #EEF2FF;
            color: var(--primary);
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }

        /* 指标大字 */
        .stat-huge {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -1px;
            color: var(--primary);
            line-height: 1;
        }

        /* 针对 Bootstrap 手风琴定制 */
        .accordion-item {
            border: 1px solid var(--border-color);
            margin-bottom: 1rem;
            border-radius: var(--radius-default) !important;
            overflow: hidden;
        }
        .accordion-button:not(.collapsed) {
            background-color: #EEF2FF;
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button:focus {
            box-shadow: none;
            border-color: var(--primary-light);
        }

        /* 底部转换区渐变背景 */
        .conversion-banner {
            background: linear-gradient(135deg, #1E1B4B 0%, #312E81 50%, #4338CA 100%);
            border-radius: 20px;
            padding: 4rem 3rem;
            color: #FFFFFF;
        }

        /* 页脚 */
        footer {
            background-color: #090D16;
            color: var(--text-sub);
            padding: 80px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        footer a {
            color: var(--text-sub);
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: #FFFFFF;
        }