/* roulang page: index */
:root {
            --primary-color: #4F46E5;
            --primary-hover: #4338CA;
            --accent-green: #10B981;
            --accent-amber: #F59E0B;
            --bg-body: #F8FAFC;
            --bg-surface: #FFFFFF;
            --bg-dark: #0F172A;
            --bg-dark-card: #1E293B;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: rgba(226, 232, 240, 0.85);
            --radius-md: 12px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(79, 70, 229, 0.12);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-body);
            color: var(--text-body);
            line-height: 1.75;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-heading);
            font-weight: 700;
            line-height: 1.35;
        }

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

        /* 顶部微通栏 */
        .top-micro-bar {
            background-color: #0F172A;
            color: #94A3B8;
            font-size: 0.825rem;
            border-bottom: 1px solid #1E293B;
        }
        .top-micro-bar a {
            color: #CBD5E1;
        }
        .top-micro-bar a:hover {
            color: #38BDF8;
        }

        /* 主导航 */
        .main-navbar {
            background: #FFFFFF;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1020;
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--text-heading);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .navbar-brand i {
            color: var(--primary-color);
            font-size: 1.5rem;
        }
        .nav-link {
            font-weight: 500;
            color: #475569;
            padding: 0.5rem 0.9rem !important;
            font-size: 0.95rem;
        }
        .nav-link:hover {
            color: var(--primary-color);
        }

        /* 进度条指示器 */
        .pipeline-progress-bar {
            background: #F1F5F9;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.85rem;
        }
        .pipeline-step {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-muted);
            padding: 8px 16px;
            font-weight: 600;
            transition: color 0.2s ease;
        }
        .pipeline-step.active, .pipeline-step:hover {
            color: var(--primary-color);
        }
        .pipeline-step-idx {
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: #E2E8F0;
            color: #475569;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
        }
        .pipeline-step.active .pipeline-step-idx {
            background: var(--primary-color);
            color: #FFF;
        }

        /* 通用按钮 */
        .btn-brand-primary {
            background-color: var(--primary-color);
            color: #FFF;
            border: 1px solid var(--primary-color);
            border-radius: 8px;
            padding: 0.65rem 1.4rem;
            font-weight: 600;
            transition: all 0.25s ease;
            box-shadow: 0 2px 6px rgba(79, 70, 229, 0.25);
        }
        .btn-brand-primary:hover {
            background-color: var(--primary-hover);
            color: #FFF;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
        }
        .btn-brand-outline {
            border: 1px solid #CBD5E1;
            background: #FFF;
            color: var(--text-heading);
            border-radius: 8px;
            padding: 0.65rem 1.4rem;
            font-weight: 600;
            transition: all 0.25s ease;
        }
        .btn-brand-outline:hover {
            background: #F1F5F9;
            color: var(--primary-color);
            border-color: #94A3B8;
        }

        /* Hero 轮播板块 */
        .hero-banner-section {
            position: relative;
            background-color: var(--bg-dark);
            color: #FFF;
            overflow: hidden;
        }
        .carousel-item {
            min-height: 580px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .carousel-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.75) 60%, rgba(15, 23, 42, 0.45) 100%);
            display: flex;
            align-items: center;
        }
        .hero-metric-board {
            background: rgba(15, 23, 42, 0.95);
            border-top: 1px solid #334155;
            position: relative;
            z-index: 10;
        }
        .metric-card-item {
            border-right: 1px solid #1E293B;
            padding: 24px 20px;
        }
        .metric-card-item:last-child {
            border-right: none;
        }
        .metric-val {
            font-size: 2.1rem;
            font-weight: 800;
            color: #38BDF8;
            font-family: Consolas, Monaco, "Courier New", monospace;
            line-height: 1.1;
        }

        /* 统一卡片 */
        .custom-card {
            background: var(--bg-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
            padding: 30px;
            height: 100%;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
            position: relative;
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #A5B4FC;
        }

        /* 核心对比区 (板块5) */
        .dark-contrast-section {
            background-color: var(--bg-dark);
            color: #F8FAFC;
        }
        .contrast-table-box {
            background: var(--bg-dark-card);
            border: 1px solid #334155;
            border-radius: var(--radius-md);
            overflow: hidden;
        }

        /* 里程碑时间线 (板块6) */
        .milestone-timeline {
            position: relative;
            padding-left: 28px;
            border-left: 2px dashed #CBD5E1;
        }
        .milestone-item {
            position: relative;
            margin-bottom: 35px;
        }
        .milestone-item:last-child {
            margin-bottom: 0;
        }
        .milestone-dot {
            position: absolute;
            left: -35px;
            top: 4px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 3px solid #FFF;
            box-shadow: 0 0 0 2px var(--primary-color);
        }

        /* 统计条 (板块8) */
        .metric-strip-bar {
            background: linear-gradient(135deg, #1E1B4B 0%, #0F172A 100%);
            border-top: 1px solid #312E81;
            border-bottom: 1px solid #312E81;
            color: #FFF;
        }

        /* 手风琴改造 */
        .accordion-button {
            font-weight: 600;
            color: var(--text-heading);
            background-color: #FFF;
            border: none;
            box-shadow: none !important;
            padding: 1.25rem 1.5rem;
        }
        .accordion-button:not(.collapsed) {
            color: var(--primary-color);
            background-color: #F8FAFC;
            border-left: 4px solid var(--primary-color);
        }
        .accordion-item {
            border: 1px solid var(--border-color);
            border-radius: 8px !important;
            margin-bottom: 12px;
            overflow: hidden;
        }

        /* 表单样式 */
        .form-control, .form-select {
            border: 1px solid #CBD5E1;
            border-radius: 8px;
            padding: 0.75rem 1rem;
            font-size: 0.95rem;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
        }

        /* 页脚 */
        .site-footer {
            background-color: #0B1120;
            color: #94A3B8;
            border-top: 1px solid #1E293B;
            font-size: 0.9rem;
        }
        .site-footer h5 {
            color: #F8FAFC;
            font-size: 1.05rem;
            margin-bottom: 20px;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer a {
            color: #94A3B8;
        }
        .site-footer a:hover {
            color: #38BDF8;
        }
        .footer-bottom-line {
            border-top: 1px solid #1E293B;
            padding: 24px 0;
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 991px) {
            .metric-card-item {
                border-right: none;
                border-bottom: 1px solid #1E293B;
            }
            .carousel-item {
                min-height: 480px;
            }
        }
        @media (max-width: 576px) {
            .carousel-item {
                min-height: 420px;
            }
            .metric-val {
                font-size: 1.75rem;
            }
        }