/* roulang page: index */
:root {
            --bg-main: #0A0F1D;
            --bg-card: rgba(15, 23, 42, 0.75);
            --border-glow: rgba(56, 189, 248, 0.2);
            --color-text-main: #F8FAFC;
            --color-text-sub: #94A3B8;
        }
        body {
            background-color: var(--bg-main);
            color: var(--color-text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            scroll-behavior: smooth;
        }
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glow);
            box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
        }
        .glow-btn {
            background: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);
            box-shadow: 0 0 20px rgba(37, 99, 235, 0.45);
            transition: all 0.3s ease;
        }
        .glow-btn:hover {
            box-shadow: 0 0 28px rgba(6, 182, 212, 0.7);
            transform: translateY(-2px);
        }
        .text-glow {
            text-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
        }