/* roulang page: index */
:root {
            --primary: #1E2530;
            --accent: #00C28A;
            --alert: #FF8C38;
            --darkbg: #11161F;
            --lightbg: #F6F8FA;
            --headtext: #0C1017;
            --bodytext: #4A5568;
            --subtext: #8A96A6;
            --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --card-shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.1);
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--lightbg);
            color: var(--bodytext);
            line-height: 1.6;
        }
        .btn-accent {
            background-color: var(--accent);
            color: #ffffff;
            transition: all 0.2s ease;
        }
        .btn-accent:hover {
            box-shadow: 0 0 15px rgba(0, 194, 138, 0.45);
            transform: translateY(-2px);
        }
        .btn-secondary {
            border: 1px solid #CBD5E1;
            color: var(--primary);
            background: #FFFFFF;
            transition: all 0.2s ease;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            background: #F1F5F9;
        }
        .custom-card {
            background: #FFFFFF;
            border: 1px solid #E2E8F0;
            border-radius: 8px;
            box-shadow: var(--card-shadow);
            transition: all 0.25s ease;
        }
        .custom-card:hover {
            box-shadow: var(--card-shadow-hover);
            border-color: #CBD5E1;
        }
        details summary::-webkit-details-marker { display: none; }