/* roulang page: index */
:root {
            --primary: #7C3AED;
            --primary-light: #A78BFA;
            --secondary: #F43F5E;
            --accent: #10B981;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        body {
            color: #334155;
            background-color: #FFFFFF;
            overflow-x: hidden;
            line-height: 1.8;
        }
        .text-gradient {
            background: linear-gradient(135deg, #7C3AED 0%, #F43F5E 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .text-neon-cyan {
            background: linear-gradient(135deg, #38BDF8 0%, #10B981 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-bg-overlay {
            background: linear-gradient(to right, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.85) 60%, rgba(124, 58, 237, 0.65) 100%);
        }
        .bg-mesh-pattern {
            background-color: #0F172A;
            background-image: radial-gradient(rgba(124, 58, 237, 0.25) 1px, transparent 1px), radial-gradient(rgba(244, 63, 94, 0.15) 1px, transparent 1px);
            background-size: 32px 32px;
            background-position: 0 0, 16px 16px;
        }
        .interactive-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .interactive-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 35px -10px rgba(124, 58, 237, 0.18);
        }
        .glass-panel {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .glass-dark {
            background: rgba(30, 41, 59, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 300px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }
        @keyframes pulse-subtle {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.95; transform: scale(1.02); }
        }
        .btn-glow-pulse {
            animation: pulse-subtle 3s infinite ease-in-out;
        }