/* roulang page: index */
:root {
            --bg-deep: #060B18;
            --bg-surface: #0a1428;
            --card-glass: rgba(15, 31, 61, 0.65);
            --border-glow: rgba(0, 242, 254, 0.2);
            --electric-blue: #0066FF;
            --cyan-glow: #00F2FE;
        }
        body {
            background-color: var(--bg-deep);
            color: #F8FAFC;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .glow-btn {
            background: linear-gradient(135deg, #0066FF 0%, #00F2FE 100%);
            box-shadow: 0 0 20px rgba(0, 102, 255, 0.45);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glow-btn:hover {
            box-shadow: 0 0 30px rgba(0, 242, 254, 0.65);
            transform: translateY(-2px);
        }
        .glow-card {
            background: var(--card-glass);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.3s ease;
        }
        .glow-card:hover {
            border-color: rgba(0, 242, 254, 0.4);
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0, 10, 30, 0.6);
        }
        .grid-pattern {
            background-image: radial-gradient(rgba(0, 102, 255, 0.15) 1px, transparent 1px);
            background-size: 32px 32px;
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 240px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }