:root{--bg:#fbfaf8;--surface:#fff;--sidebar:#f2f0ec;--border:#e3dfd8;--text:#1f1d1a;--muted:#77726a;--accent:#3b5bdb;--accent-soft:#e8ecfb;--user-bubble:#ece9e3;--code-bg:#f3f1ed;--danger:#c92a2a;--danger-soft:#fdecec;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif}@media (prefers-color-scheme:dark){:root{--bg:#1b1a18;--surface:#23221f;--sidebar:#151413;--border:#34322e;--text:#ebe8e2;--muted:#99948b;--accent:#7b93f0;--accent-soft:#262c42;--user-bubble:#2e2c28;--code-bg:#2a2925;--danger:#ff8787;--danger-soft:#3a2222}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}button,select,textarea{font:inherit;color:inherit}button{cursor:pointer}.app{height:100%;display:flex}.sidebar{background:var(--sidebar);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;gap:12px;width:264px;padding:16px 12px;display:flex}.brand{align-items:center;gap:8px;padding:4px 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