/* roulang page: index */
:root {
            --bg-main: #0B0E14;
            --bg-surface: #121722;
            --border-color: #1E293B;
            --text-primary: #F9FAFB;
            --text-secondary: #94A3B8;
            --color-violet: #7C3AED;
            --color-cyan: #06B6D4;
            --color-amber: #F59E0B;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-primary);
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #06B6D4 0%, #7C3AED 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .text-gradient-amber {
            background: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-pattern {
            background-image: radial-gradient(rgba(124, 58, 237, 0.15) 1px, transparent 1px), radial-gradient(rgba(6, 182, 212, 0.15) 1px, transparent 1px);
            background-size: 40px 40px;
            background-position: 0 0, 20px 20px;
        }
        .glass-card {
            background: rgba(18, 23, 34, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(30, 41, 59, 0.8);
        }
        .glass-card:hover {
            border-color: rgba(6, 182, 212, 0.4);
            transform: translateY(-3px);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .clip-burst {
            clip-path: polygon(0% 0%, 100% 0%, 95% 50%, 100% 100%, 0% 100%, 5% 50%);
        }
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .faq-active .faq-content {
            max-height: 250px;
        }
        .faq-active .faq-chevron {
            transform: rotate(180deg);
        }