/* roulang page: index */
:root {
            --bg-main: #0B0D14;
            --bg-card: #141724;
            --bg-card-alt: #1B1F33;
            --primary: #8B5CF6;
            --secondary: #6366F1;
            --accent: #F59E0B;
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
            --text-sub: #64748B;
            --border: rgba(255, 255, 255, 0.08);
        }
        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .hero-bg {
            background-image: linear-gradient(to bottom, rgba(11, 13, 20, 0.82), rgba(11, 13, 20, 0.96)), url('/assets/images/db153dcafe9d5e28.png');
            background-size: cover;
            background-position: center;
        }
        .feature-border {
            border: 1px solid var(--border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .feature-border:hover {
            border-color: rgba(139, 92, 246, 0.5);
            box-shadow: 0 10px 25px -5px rgba(139, 92, 246, 0.2);
            transform: translateY(-4px);
        }
        .text-gradient {
            background: linear-gradient(135deg, #A78BFA 0%, #F59E0B 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .accordion-content.open {
            max-height: 500px;
            opacity: 1;
        }