/* roulang page: index */
:root {
            --brand-navy: #0F2C59;
            --brand-steel: #1E4E8C;
            --brand-orange: #FF6B00;
            --brand-bg: #F8FAFC;
            --card-border: rgba(15, 44, 89, 0.08);
            --card-shadow: 0 10px 30px -5px rgba(15, 44, 89, 0.05);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: PingFang SC, "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--brand-bg);
            color: #1E293B;
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }
        .app-container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .glass-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(15, 44, 89, 0.08);
        }
        .badge-pill {
            display: inline-flex;
            align-items: center;
            border-radius: 9999px;
            padding: 0.25rem 0.85rem;
            font-size: 0.875rem;
            font-weight: 500;
        }
        .surface-card {
            background: #ffffff;
            border: 1px solid var(--card-border);
            border-radius: 20px;
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .surface-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 18px 36px -8px rgba(15, 44, 89, 0.12);
        }
        .btn-brand-primary {
            background: linear-gradient(135deg, #FF6B00 0%, #FF8833 100%);
            color: #ffffff;
            border-radius: 9999px;
            font-weight: 600;
            transition: all 0.2s ease;
            box-shadow: 0 4px 14px rgba(255, 107, 0, 0.3);
        }
        .btn-brand-primary:hover {
            opacity: 0.95;
            box-shadow: 0 6px 20px rgba(255, 107, 0, 0.42);
        }
        .btn-brand-dark {
            background: linear-gradient(135deg, #0F2C59 0%, #1E4E8C 100%);
            color: #ffffff;
            border-radius: 9999px;
            font-weight: 600;
            transition: all 0.2s ease;
        }
        .btn-brand-dark:hover {
            opacity: 0.92;
        }
        .section-py { padding-top: 5.5rem; padding-bottom: 5.5rem; }
        @media (max-width: 768px) {
            .section-py { padding-top: 3.25rem; padding-bottom: 3.25rem; }
        }
        details > summary {
            list-style: none;
            cursor: pointer;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }