/* roulang page: index */
:root {
            --primary: #0F2942;
            --primary-dark: #0B1E31;
            --accent: #C59B27;
            --text-main: #0F172A;
            --text-muted: #475569;
            --bg-light: #F8FAFC;
            --bg-card: #FFFFFF;
            --border-color: #E2E8F0;
            --shadow-sm: 0 2px 8px -2px rgba(15, 41, 66, 0.06);
            --shadow-md: 0 12px 24px -4px rgba(15, 41, 66, 0.08);
            --shadow-lg: 0 20px 32px -6px rgba(15, 41, 66, 0.12);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
        }

        .section-py {
            padding-top: 5.5rem;
            padding-bottom: 5.5rem;
        }

        @media (max-width: 768px) {
            .section-py {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }

        .card-custom {
            background-color: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 0.75rem;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }

        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: #CBD5E1;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            font-size: 0.8125rem;
            font-weight: 600;
            border-radius: 9999px;
            background-color: var(--accent-light, #FDF8EA);
            color: var(--accent, #C59B27);
            border: 1px solid rgba(197, 155, 39, 0.25);
        }

        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            font-weight: 600;
            padding: 0.75rem 1.75rem;
            border-radius: 0.5rem;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-primary:hover {
            background-color: var(--primary-light);
            box-shadow: 0 4px 12px rgba(15, 41, 66, 0.2);
        }

        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF;
            font-weight: 600;
            padding: 0.75rem 1.75rem;
            border-radius: 0.5rem;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-accent:hover {
            background-color: #A9821B;
            box-shadow: 0 4px 12px rgba(197, 155, 39, 0.3);
        }

        details summary::-webkit-details-marker {
            display: none;
        }

        details[open] summary .faq-icon {
            transform: rotate(180deg);
        }