/* roulang page: index */
:root {
            --primary-navy: #0F2B48;
            --primary-navy-dark: #0B1E34;
            --accent-teal: #0D9488;
            --accent-blue: #2563EB;
            --action-amber: #D97706;
            --bg-surface: #F8FAFC;
            --bg-muted: #F1F5F9;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 43, 72, 0.06);
            --shadow-elevated: 0 12px 32px -4px rgba(15, 43, 72, 0.12);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-surface);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-heading);
            letter-spacing: -0.015em;
            line-height: 1.35;
        }

        section {
            scroll-margin-top: 108px;
        }

        .cta-gradient {
            background: linear-gradient(135deg, #0F2B48 0%, #1E3A8A 100%);
        }

        .btn-amber {
            background-color: var(--action-amber);
            color: #FFFFFF;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-amber:hover {
            background-color: #B45309;
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(217, 119, 6, 0.35);
        }

        .btn-primary {
            background-color: var(--primary-navy);
            color: #FFFFFF;
            transition: all 0.25s ease;
        }
        .btn-primary:hover {
            background-color: #1A3E66;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(15, 43, 72, 0.2);
        }

        .card-premium {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: 14px;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            box-shadow: var(--shadow-subtle);
        }
        .card-premium:hover {
            border-color: #CBD5E1;
            transform: translateY(-4px);
            box-shadow: var(--shadow-elevated);
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            font-size: 0.8125rem;
            font-weight: 600;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            background-color: rgba(13, 148, 136, 0.1);
            color: var(--accent-teal);
            border: 1px solid rgba(13, 148, 136, 0.2);
        }

        .faq-item[open] .faq-icon {
            transform: rotate(180deg);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }