:root{--bg:#fafaf9;--fg:#1c1917;--muted:#78716c;--line:#e7e5e4;--accent:#0f766e;--err:#b91c1c;--card:#fff}@media (prefers-color-scheme:dark){:root{--bg:#1c1917;--fg:#f5f5f4;--muted:#a8a29e;--line:#44403c;--accent:#2dd4bf;--err:#f87171;--card:#292524}}*{box-sizing:border-box}body{background:var(--bg);color:var(--fg);margin:0;font:16px/1.5 system-ui,-apple-system,Segoe UI,sans-serif}header{border-bottom:1px solid var(--line);background:var(--card)}nav{flex-wrap:wrap;gap:8px 16px;max-width:720px;margin:0 auto;padding:12px 16px;display:flex}nav a{color:var(--fg);font-weight:500;text-decoration:none}main{max-width:720px;margin:0 auto;padding:16px}h1{margin:8px 0 16px;font-size:1.5rem}form,.card{background:var(--card);border:1px solid var(--line);border-radius:8px;gap:12px;margin-bottom:16px;padding:16px;display:grid}label{color:var(--muted);gap:4px;font-size:.9rem;display:grid}input,textarea,button{font:inherit;border:1px solid var(--line);background:var(--bg);color:var(--fg);border-radius:6px;width:100%;padding:10px 12px}button{background:var(--accent);color:#fff;cursor:pointer;border:0;font-weight:600}button:disabled{opacity:.6}.err{color:var(--err)}.muted{color:var(--muted);font-size:.9rem}ul.list{gap:8px;margin:0;padding:0;list-style:none;display:grid}ul.list li{background:var(--card);border:1px solid var(--line);overflow-wrap:anywhere;border-radius:6px;padding:10px 12px}.msgs{border:1px solid var(--line);background:var(--card);border-radius:8px;gap:6px;max-height:50vh;padding:8px;display:grid;overflow-y:auto}.msg{background:var(--line);overflow-wrap:anywhere;border-radius:10px;max-width:80%;padding:6px 10px}.msg.mine{background:var(--accent);color:#fff;justify-self:end}table{border-collapse:collapse;width:100%;font-size:.8rem}td,th{border-bottom:1px solid var(--line);text-align:left;vertical-align:top;overflow-wrap:anywhere;padding:4px}.scroll{overflow-x:auto}code{overflow-wrap:anywhere}