/* roulang page: index */
:root {
            --primary: #059669;
            --accent: #FF6B00;
            --dark: #0F141C;
            --bg-light: #F6F8FA;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: #1E293B;
            -webkit-font-smoothing: antialiased;
        }
        .countdown-ring {
            stroke-dasharray: 283;
            stroke-dashoffset: 65;
            transition: stroke-dashoffset 1s ease;
        }
        .glass-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
        }
        .metric-mono {
            font-family: 'JetBrains Mono', monospace;
            font-feature-settings: "tnum";
            font-variant-numeric: tabular-nums;
        }
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
        }
        .faq-content.open {
            max-height: 500px;
            transition: max-height 0.3s ease-in-out;
        }