:root{--bg: #f5f6f8;--fg: #1b1f23;--accent: #0b6bcb;--border: #d5d9de;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg)}.app-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;background:#fff;border-bottom:1px solid var(--border)}.app-header h1{font-size:1.25rem;margin:0}.user{font-size:.9rem;color:var(--accent);text-decoration:none}.tabs{display:flex;gap:.5rem;padding:.75rem 1.5rem}.tabs button{border:1px solid var(--border);background:#fff;padding:.4rem 1rem;border-radius:4px;cursor:pointer}.tabs button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.content{padding:0 1.5rem 2rem}.section-head{display:flex;align-items:center;gap:1rem}.section-head button{border:1px solid var(--border);background:#fff;padding:.3rem .8rem;border-radius:4px;cursor:pointer}pre{background:#fff;border:1px solid var(--border);border-radius:4px;padding:1rem;overflow:auto;max-height:60vh}.error{color:#b3261e}