:root{--bg:#f2f4f8;--card:#fff;--text:#131722;--muted:#6b7384;--line:#e3e7ee;--accent:#2f6df6;--accent-text:#fff;--soft:#eef2fb;--danger:#d43c3c;--warn:#c77700;--ok:#1f9d55;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root{--bg:#0f1218;--card:#181c25;--text:#e9ecf2;--muted:#96a0b3;--line:#2a303c;--accent:#5b8dff;--accent-text:#0b0e14;--soft:#202735;--danger:#ff6b6b;--warn:#f0a530;--ok:#4cc38a;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}*{box-sizing:border-box}html,body{margin:0}body{background:var(--bg);color:var(--text);font-family:Segoe UI,Tahoma,system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.55}h1{margin:0;font-size:1.15rem}h2{align-items:center;gap:8px;margin:0 0 10px;font-size:1rem;display:flex}small{color:var(--muted)}p{margin:0 0 8px}button,input,select,textarea{font:inherit;color:inherit}button{border:1px solid 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0}.body{white-space:pre-wrap;color:var(--muted);overflow-wrap:anywhere;font-size:.93rem}.actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.actions button{padding:5px 11px;font-size:.88rem}.inline{color:var(--muted);align-items:center;gap:6px;font-size:.88rem;display:inline-flex}.inline input,.inline select{width:auto;padding:4px 8px}.children{border-inline-start:2px solid var(--line);margin-inline-start:34px;padding-inline-start:10px}.chips,.tracks,.stepper{gap:8px;padding-bottom:2px;display:flex;overflow-x:auto}.chips button,.tracks button{white-space:nowrap;border-radius:999px}.chips button.on{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.chips button.on small{color:inherit}.tracks{flex-wrap:wrap}.tracks button{padding:10px 18px;font-weight:600}.tracks button.on{color:#fff}.stepper button{white-space:nowrap;color:var(--muted);flex:1;padding:8px;font-size:.88rem}.stepper button 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13px}.msg.user{background:var(--accent);color:var(--accent-text);align-self:flex-start}.msg.assistant{background:var(--card);border:1px solid var(--line);align-self:flex-end}.msg.thinking{color:var(--muted)}.composer{bottom:calc(70px + env(safe-area-inset-bottom));background:var(--bg);align-items:flex-end;gap:8px;padding:6px 0;display:flex;position:sticky}.composer textarea{background:var(--card);min-height:46px}@media (width>=760px){.composer{bottom:0}}.gate{flex-direction:column;gap:12px;max-width:380px;margin:14vh auto 0;display:flex}.gate h1{text-align:center;font-size:1.4rem}.sheet-back{z-index:10;background:#00000073;justify-content:center;align-items:flex-end;padding:16px;display:flex;position:fixed;inset:0}.sheet{flex-direction:column;gap:10px;width:100%;max-width:420px;display:flex}@media (width>=760px){.sheet-back{align-items:center}}