/* roulang page: index */
:root {
            --primary: #00D2B4;
            --primary-hover: #00b39a;
            --dark-bg: #0B0E14;
            --card-border: rgba(226, 232, 240, 0.8);
            --transition-speed: 0.3s;
        }
        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: #475569;
            background-color: #FFFFFF;
            overflow-x: hidden;
        }
        .text-glow {
            text-shadow: 0 0 20px rgba(0, 210, 180, 0.35);
        }
        .hero-overlay {
            background: linear-gradient(180deg, rgba(11, 14, 20, 0.75) 0%, rgba(11, 14, 20, 0.95) 100%);
        }
        .glass-header {
            background: rgba(11, 14, 20, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .glass-card-dark {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .interactive-card {
            transition: transform var(--transition-speed) ease-out, border-color var(--transition-speed) ease-out, box-shadow var(--transition-speed) ease-out;
        }
        .interactive-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 210, 180, 0.4);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
        }
        .accordion-content {
            transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-item.active .accordion-content {
            max-height: 240px;
            opacity: 1;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }