/* roulang page: index */
:root {
            --primary: #0f52ba;
            --primary-accent: #2563eb;
            --bg-canvas: #f8fafc;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-line: #e2e8f0;
        }
        body {
            font-family: Inter, system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-canvas);
            color: var(--text-body);
            overflow-x: hidden;
            line-height: 1.65;
        }
        .section-header {
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            margin-bottom: 3.5rem;
            text-align: center;
        }
        .hero-banner-bg {
            background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92), rgba(15, 82, 186, 0.85)), url('/assets/images/10bc24dcaac0f9be.webp');
            background-size: cover;
            background-position: center;
        }
        .custom-card {
            background: #ffffff;
            border: 1px solid var(--border-line);
            border-radius: 0.75rem;
            transition: all 0.25s ease-in-out;
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -6px rgba(15, 82, 186, 0.08), 0 6px 12px -4px rgba(0, 0, 0, 0.03);
            border-color: #cbd5e1;
        }
        .interactive-faq details summary::-webkit-details-marker {
            display: none;
        }