:root{--bg:#f6f6f7;--surface:#fff;--border:#e3e4e8;--text:#18181b;--muted:#6b7280;--accent:#4f46e5;--accent-soft:#eef2ff;--ok:#16a34a;--ko:#dc2626}*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:14px/1.5 Inter,ui-sans-serif,system-ui,sans-serif}a{color:var(--accent)}button,input,textarea{font:inherit}button{cursor:pointer;border:1px solid var(--border);background:var(--surface);border-radius:8px;padding:8px 12px}button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button:disabled{opacity:.6;cursor:default}.card{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:14px}.muted{color:var(--muted)}.ko{color:var(--ko)}.ok{color:var(--ok)}.shell{max-width:1400px;margin:0 auto;padding:16px}.topbar{justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.workspace{grid-template-columns:minmax(340px,480px) 1fr;gap:16px;min-height:calc(100vh - 90px);display:grid}@media (max-width:900px){.workspace{grid-template-columns:1fr}}.chat{flex-direction:column;gap:10px;display:flex}.messages{flex-direction:column;gap:8px;max-height:55vh;display:flex;overflow-y:auto}.msg{white-space:pre-wrap;border-radius:10px;padding:8px 10px}.msg.user{background:var(--accent-soft);align-self:flex-end;max-width:92%}.msg.assistant{background:var(--bg);border:1px solid var(--border);max-width:92%}.msg small{color:var(--muted);margin-top:4px;display:block}textarea{border:1px solid var(--border);resize:vertical;border-radius:8px;width:100%;padding:10px}iframe.preview{border:1px solid var(--border);background:#fff;border-radius:10px;width:100%;height:calc(100vh - 170px)}.versions{flex-direction:column;gap:6px;margin:0;padding:0;font-size:13px;list-style:none;display:flex}.versions li{flex-wrap:wrap;align-items:baseline;gap:8px;display:flex}input[type=password]{border:1px solid var(--border);border-radius:8px;width:100%;padding:10px}