/* roulang page: index */
:root {
            --primary: #1E40AF;
            --accent: #0284C7;
            --surface-bg: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--surface-bg);
            color: var(--text-body);
            overflow-x: hidden;
        }
        .card-shadow {
            box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(30, 64, 175, 0.1), 0 8px 10px -6px rgba(30, 64, 175, 0.05);
        }
        .stage-glow {
            position: relative;
        }
        .stage-glow::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 80%;
            height: 80%;
            transform: translate(-50%, -50%);
            background: radial-gradient(circle, rgba(2, 132, 199, 0.18) 0%, rgba(248, 250, 252, 0) 70%);
            z-index: 0;
            pointer-events: none;
        }