/* roulang page: index */
:root {
            --bg-main: #0B0E14;
            --bg-card: #151A23;
            --border-glow: rgba(255, 255, 255, 0.08);
            --accent-green: #00FF87;
            --accent-cyan: #60EFFF;
        }
        body {
            background-color: var(--bg-main);
            color: #F8FAFC;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .glow-border {
            border: 1px solid var(--border-glow);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .glow-border:hover {
            border-color: rgba(0, 255, 135, 0.4);
            box-shadow: 0 10px 30px -10px rgba(0, 255, 135, 0.15);
        }
        .text-gradient {
            background: linear-gradient(135deg, #00FF87 0%, #60EFFF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .bg-gradient-btn {
            background: linear-gradient(135deg, #00FF87 0%, #60EFFF 100%);
            color: #0B0E14;
            font-weight: 700;
            transition: all 0.25s ease;
        }
        .bg-gradient-btn:hover {
            opacity: 0.92;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 255, 135, 0.3);
        }
        .code-block {
            background: #0d1117;
            font-family: "JetBrains Mono", "Fira Code", monospace;
        }