/* roulang page: index */
:root {
            --primary: #6366F1;
            --primary-dark: #4F46E5;
            --cyan-glow: #06B6D4;
            --coral-accent: #F43F5E;
            --bg-light: #F8FAFC;
            --text-dark: #1E293B;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg-light);
            color: var(--text-dark);
            overflow-x: hidden;
        }
        .hero-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(99, 102, 241, 0.85) 100%);
        }
        .glow-border {
            box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
            border: 1px solid rgba(6, 182, 212, 0.3);
        }
        .glow-button {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glow-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .accordion-content.active {
            max-height: 200px;
            opacity: 1;
        }