:root{--bg:#f5f7fb;--panel:#ffffff;--panel-subtle:#f0f4f8;--border:#d9e2ec;--text:#17202a;--muted:#61758a;--primary:#155eef;--primary-dark:#0f47b8;--danger:#c92a2a;--ok:#087f5b;--radius:8px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit}button,input,select,textarea{font:inherit}.shell{min-height:100vh;display:grid;grid-template-rows:auto 1fr}.topbar{height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 20px;background:#fff;border-bottom:1px solid var(--border)}.brand{font-weight:700}.nav{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:14px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-gap:16px;gap:16px;padding:16px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);min-width:0}.panel__head{padding:16px;border-bottom:1px solid var(--border)}.panel__body{padding:16px}.chat{display:grid;grid-template-rows:1fr auto;min-height:calc(100vh - 88px)}.messages{padding:16px;overflow:auto}.message{max-width:760px;margin-bottom:12px;padding:12px 14px;border-radius:var(--radius);background:var(--panel-subtle);white-space:pre-wrap;line-height:1.6}.message--user{margin-left:auto;background:#e7f0ff}.composer{display:grid;grid-template-columns:1fr auto auto;grid-gap:8px;gap:8px;padding:16px;border-top:1px solid var(--border)}.composer textarea{min-height:72px;resize:vertical}.field{display:grid;grid-gap:6px;gap:6px;margin-bottom:12px}.field label{font-size:13px;font-weight:700}.field input,.field select,.field textarea{width:100%;padding:9px 10px}.button,.field input,.field select,.field textarea{border:1px solid var(--border);border-radius:6px;background:#fff}.button{padding:9px 12px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px}.button--primary{border-color:var(--primary);background:var(--primary);color:#fff}.button--primary:hover{background:var(--primary-dark)}.button:disabled{opacity:.5;cursor:not-allowed}.grid{display:grid;grid-gap:16px;gap:16px}.grid--cards{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:16px}.badge{display:inline-flex;align-items:center;padding:3px 8px;border-radius:999px;background:var(--panel-subtle);color:var(--muted);font-size:12px}.artifact{width:100%;border:1px solid var(--border);border-radius:var(--radius);background:#fff}.muted{color:var(--muted)}.login{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(420px,100%);background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px}@media (max-width:900px){.layout{grid-template-columns:1fr}.chat{min-height:60vh}}