:root{color-scheme:light;--bg: #ffffff;--text: #111111;--muted: #555555;--surface: #f6f6f6;--border: #e5e7eb;--primary: #2563eb}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}button{background:var(--primary);color:#fff;border:none;border-radius:8px;padding:10px 14px;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}pre{background:var(--surface);border:1px solid var(--border);color:var(--text)}