/* roulang page: index */
:root {
            --primary-navy: #0F172A;
            --primary-emerald: #10B981;
            --primary-cyan: #06B6D4;
            --accent-amber: #F59E0B;
            --bg-light: #F8FAFC;
            --card-radius: 1.25rem;
        }
        body {
            background-color: var(--bg-light);
            color: #334155;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .code-box {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.25s ease-in-out;
        }