/* roulang page: index */
:root {
            --primary: #6366F1;
            --primary-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
            --accent-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
            --card-border: rgba(226, 232, 240, 0.8);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #F8FAFC;
            color: #1E293B;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #4F46E5 0%, #9333EA 50%, #EC4899 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .dark-text-gradient {
            background: linear-gradient(135deg, #818CF8 0%, #C084FC 50%, #38BDF8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .bento-card {
            background: #FFFFFF;
            border: 1px solid rgba(226, 232, 240, 0.9);
            box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.04), 0 4px 6px -4px rgba(0, 0, 0, 0.02);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .bento-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 35px -10px rgba(99, 102, 241, 0.12), 0 1px 3px 0 rgba(0, 0, 0, 0.05);
            border-color: rgba(139, 92, 246, 0.4);
        }
        .dark-bento-card {
            background: #1E293B;
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
        }
        .data-badge {
            background: rgba(99, 102, 241, 0.08);
            border: 1px solid rgba(99, 102, 241, 0.2);
            color: #4F46E5;
        }
        .tag-pill {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .faq-item.active .faq-content {
            max-height: 250px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }