/* roulang page: index */
:root {
            --bg-primary: #0F111A;
            --bg-secondary: #161926;
            --text-main: #F8FAFC;
            --text-body: #CBD5E1;
            --text-muted: #94A3B8;
            --color-gold: #F59E0B;
            --color-cyan: #06B6D4;
            --color-purple: #6366F1;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(245, 158, 11, 0.4);
        }
        body {
            background-color: var(--bg-primary);
            color: var(--text-body);
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            overflow-x: hidden;
        }
        .gold-gradient-text {
            background: linear-gradient(135deg, #FDE68A 0%, #F59E0B 50%, #D97706 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-banner-bg {
            background-image: linear-gradient(to bottom, rgba(15, 17, 26, 0.75), rgba(15, 17, 26, 0.95)), url('/assets/images/ccc55c6c9e444f49.jpg');
            background-size: cover;
            background-position: center;
        }
        .card-custom {
            background: rgba(22, 25, 38, 0.85);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
            box-shadow: 0 12px 30px -10px rgba(245, 158, 11, 0.15);
        }
        .btn-gold {
            background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
            color: #0F111A;
            font-weight: 700;
            box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
            transition: all 0.25s ease;
        }
        .btn-gold:hover {
            background: linear-gradient(135deg, #FBBF24 0%, #F59E0B 100%);
            box-shadow: 0 6px 25px rgba(245, 158, 11, 0.5);
            transform: translateY(-2px);
        }
        .btn-outline {
            border: 1px solid rgba(245, 158, 11, 0.4);
            color: #F8FAFC;
            transition: all 0.25s ease;
        }
        .btn-outline:hover {
            border-color: #F59E0B;
            background: rgba(245, 158, 11, 0.1);
            color: #F59E0B;
        }
        .tab-btn.active {
            border-bottom: 2px solid #F59E0B;
            color: #F59E0B;
            font-weight: 700;
        }
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .faq-item.open .faq-content {
            max-height: 200px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }