/* roulang page: index */
:root {
            --bg-deep: #0a0f1d;
            --bg-surface: #0f172a;
            --primary-cyan: #00f0ff;
            --primary-blue: #3b82f6;
            --accent-green: #10b981;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --glass-bg: rgba(15, 23, 42, 0.78);
            --glass-border: rgba(0, 240, 255, 0.18);
        }
        
        body {
            background-color: var(--bg-deep);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", Roboto, sans-serif;
            overflow-x: hidden;
        }

        .glass-card {
            background: var(--glass-bg);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--glass-border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card:hover {
            border-color: rgba(0, 240, 255, 0.5);
            transform: translateY(-3px);
            box-shadow: 0 10px 30px -10px rgba(0, 240, 255, 0.15);
        }

        .glow-btn-cyan {
            background: linear-gradient(135deg, #00f0ff 0%, #3b82f6 100%);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
            transition: all 0.3s ease;
        }

        .glow-btn-cyan:hover {
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
            transform: translateY(-2px);
        }

        .glow-text {
            text-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
        }

        /* 隐藏 details 默认三角 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }
        details[open] summary .faq-icon {
            transform: rotate(180deg);
        }

        /* 平滑滚动 */
        html {
            scroll-behavior: smooth;
        }