/* roulang page: index */
:root {
            --primary: #0f172a;
            --accent: #b45309;
            --accent-hover: #d97706;
            --bg-light: #f8fafc;
            --bg-subtle: #f1f5f9;
            --text-main: #0f172a;
            --text-muted: #475569;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            line-height: 1.75;
        }
        .code-window {
            background: #090d16;
            border: 1px solid #1e293b;
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, opacity 0.2s ease;
            opacity: 0;
        }
        .accordion-item.active .accordion-content {
            max-height: 250px;
            opacity: 1;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }