:root{--bg:#fff;--fg:#111;--mut:#5b5b5b;--line:#e4e4e4;--card:#f6f6f6;--acc:#111;--accfg:#fff;--focus:#0a58ca;--code:#f0f0f0;--radius:12px}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0b0b0b;--fg:#f2f2f2;--mut:#a0a0a0;--line:#262626;--card:#151515;--acc:#f2f2f2;--accfg:#0b0b0b;--focus:#6ea8fe;--code:#1b1b1b}}
:root[data-theme=dark]{--bg:#0b0b0b;--fg:#f2f2f2;--mut:#a0a0a0;--line:#262626;--card:#151515;--acc:#f2f2f2;--accfg:#0b0b0b;--focus:#6ea8fe;--code:#1b1b1b}
*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif}
button,textarea{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.app{display:grid;grid-template-columns:260px 1fr;height:100dvh}
.side{border-right:1px solid var(--line);padding:16px;display:flex;flex-direction:column;gap:12px;overflow:auto}
.side h1{font-size:16px;margin:0;font-weight:600}
.btn{border:1px solid var(--line);background:var(--card);border-radius:8px;padding:8px 12px;cursor:pointer;min-height:40px}
.btn.primary{background:var(--acc);color:var(--accfg);border-color:var(--acc)}
.hist{display:flex;flex-direction:column;gap:4px}.hist button{text-align:left;background:none;border:0;padding:8px;border-radius:8px;cursor:pointer;color:var(--mut)}
.hist button[aria-current=true],.hist button:hover{background:var(--card);color:var(--fg)}
.main{display:flex;flex-direction:column;min-width:0;height:100dvh}
.log{flex:1;overflow:auto;padding:24px 16px;scroll-behavior:auto}
.col{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:20px}
.msg.user{align-self:flex-end;background:var(--card);border-radius:var(--radius);padding:10px 14px;max-width:85%}
.msg.bot p,.msg.bot ul,.msg.bot ol{margin:0 0 10px}.msg.bot h3{font-size:16px;margin:14px 0 6px}
.cite{font-size:12px;vertical-align:super;border:1px solid var(--line);border-radius:6px;padding:0 4px;margin:0 1px;color:var(--fg);text-decoration:none}
pre{position:relative;background:var(--code);border:1px solid var(--line);border-radius:8px;padding:12px;overflow:auto;margin:8px 0}
code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px}.msg code:not(pre code){background:var(--code);padding:1px 5px;border-radius:4px}
.copy{position:absolute;top:6px;right:6px;font-size:12px;padding:2px 8px;min-height:28px}
.src{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.src a{font-size:13px;border:1px solid var(--line);background:var(--card);border-radius:999px;padding:3px 10px;color:var(--fg);text-decoration:none}
.row{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.chip{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:6px 12px;cursor:pointer;font-size:14px}.chip:hover{background:var(--card)}
.tools{display:flex;gap:6px;margin-top:6px}.tools button{background:none;border:0;color:var(--mut);cursor:pointer;padding:4px 8px;border-radius:6px;font-size:13px}.tools button:hover{background:var(--card)}
.hero{max-width:760px;margin:10vh auto 0;padding:0 16px}.hero h2{font-size:28px;margin:0 0 6px}.hero p{color:var(--mut);margin:0 0 20px}
.starts{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}.start{text-align:left;border:1px solid var(--line);background:var(--card);border-radius:var(--radius);padding:14px;cursor:pointer;min-height:64px}.start:hover{border-color:var(--fg)}
.composer{border-top:1px solid var(--line);padding:12px 16px;background:var(--bg)}.composer form{max-width:760px;margin:0 auto;display:flex;gap:8px;align-items:flex-end}
textarea{flex:1;resize:none;border:1px solid var(--line);border-radius:var(--radius);padding:10px 12px;background:var(--bg);max-height:160px;min-height:44px}
.note{font-size:12px;color:var(--mut);text-align:center;margin-top:6px}.typing{display:inline-flex;gap:4px}.typing i{width:6px;height:6px;border-radius:50%;background:var(--mut);animation:b 1s infinite}.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes b{50%{opacity:.25}}@media (prefers-reduced-motion:reduce){.typing i{animation:none}}
.err{border:1px solid var(--line);background:var(--card);border-radius:var(--radius);padding:12px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.menu{display:none}
@media (max-width:760px){.app{grid-template-columns:1fr}.side{display:none}.side.open{display:flex;position:fixed;inset:0;background:var(--bg);z-index:5}.menu{display:inline-flex}.bar{display:flex;padding:8px 12px;border-bottom:1px solid var(--line);gap:8px}}
@media (min-width:761px){.bar{display:none}}
.embed .side{display:none}.embed .menu{display:none}.embed .bar{display:none}