:root{--bg:#ffffff;--sidebar:#f7f7f8;--line:#ececec;--text:#0d0d0d;--muted:#6e6e80;--bubble:#f4f4f4;--accent:#0d0d0d;--danger:#b42318;--shadow:0 8px 24px rgba(0,0,0,0.08);--max:760px}*{box-sizing:border-box}body,html{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;line-height:1.55}button,textarea{font:inherit}.app{height:100%;min-height:100%}.app,aside{display:flex}aside{width:260px;flex:none;background:var(--sidebar);border-right:1px solid var(--line);padding:12px;flex-direction:column;gap:12px}.new-chat{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:transparent;border:1px solid #d9d9e3;border-radius:12px;padding:10px 12px;cursor:pointer;color:var(--text)}.new-chat:hover{background:#ececf1}.side-foot{margin-top:auto;color:var(--muted);font-size:13px;padding:8px}.side-foot strong{display:block;color:var(--text);font-size:14px;margin-bottom:4px}.chat-list{flex:1;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:2px}.chat-row{display:flex;align-items:center;min-width:0;border-radius:10px}.chat-row.active,.chat-row.confirm,.chat-row:hover{background:#ececf1}.chat-item{flex:1;min-width:0;width:auto;text-align:left;border:0;border-radius:10px;padding:8px 10px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-delete,.chat-item{background:transparent;cursor:pointer}.chat-delete{display:none;flex:none;width:28px;height:28px;margin-right:4px;padding:0;border:0;border-radius:8px;color:var(--muted);place-items:center}.chat-row.active .chat-delete,.chat-row:focus-within .chat-delete,.chat-row:hover .chat-delete{display:grid}.chat-delete:hover{background:#e3e3e8;color:var(--danger)}.chat-row.confirm .chat-delete,.chat-row.confirm .chat-item{display:none}.chat-confirm{display:none;flex:1;align-items:center;gap:4px;padding:4px}.chat-row.confirm .chat-confirm{display:flex}.chat-confirm button{border:0;border-radius:8px;background:transparent;color:var(--text);cursor:pointer;padding:6px 8px}.chat-confirm-yes{color:var(--danger);font-weight:600}.chat-confirm-yes:hover{background:#f8d7d4}@media (hover:none){.chat-delete{display:grid}}main{flex:1;min-width:0;display:flex;flex-direction:column;position:relative}.thread{flex:1;overflow-y:auto;padding:24px 16px 12px}main.is-empty{justify-content:center;padding-bottom:14vh}main.is-empty .thread{flex:0 0 auto;overflow:visible;padding-bottom:0}main.is-empty .composer-wrap{background:transparent;padding-top:18px}.empty{max-width:var(--max);margin:0 auto;text-align:center;padding:0 16px}.empty h1{font-size:28px;font-weight:500;margin:0 0 8px}.empty p{color:var(--muted);margin:0}.chips{display:none;flex-wrap:wrap;gap:8px;justify-content:center;max-width:var(--max);margin:16px auto 0}main.is-empty .chips{display:flex}.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;cursor:pointer;color:var(--text)}.chip:hover{background:var(--bubble)}.msg{max-width:var(--max);margin:0 auto 22px;display:flex;gap:14px}.msg.user{justify-content:flex-end}.avatar{width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;flex:none;margin-top:2px}.user-bubble{background:var(--bubble);border-radius:22px;padding:10px 16px;max-width:min(85%,560px);white-space:pre-wrap;word-break:break-word}.assistant-body{min-width:0;flex:1;padding-top:2px}.assistant-body p{margin:0 0 .75em}.assistant-body p:last-child{margin-bottom:0}.assistant-body ol,.assistant-body ul{margin:0 0 .75em;padding-left:1.25em}.assistant-body h1,.assistant-body h2,.assistant-body h3{font-size:1.05em;margin:.4em 0}.assistant-body code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:#f4f4f4;padding:.1em .35em;border-radius:6px}.assistant-body pre{background:#0d0d0d;color:#f5f5f5;padding:12px 14px;border-radius:12px;overflow-x:auto}.assistant-body pre code{background:transparent;color:inherit;padding:0}.assistant-body a{color:#0563c1}.sources{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.source{font-size:12px;color:#444;background:#f4f4f4;border-radius:999px;padding:3px 10px}button.source{font:inherit;border:0;cursor:pointer}button.source:hover{background:#e4e4e4}.error{color:var(--danger);margin-top:8px}.composer-wrap{padding:8px 16px 18px;background:linear-gradient(0deg,#fff 70%,rgba(255,255,255,0))}.composer{max-width:var(--max);margin:0 auto;display:flex;align-items:flex-end;gap:8px;border:1px solid #e3e3e3;border-radius:28px;box-shadow:var(--shadow);padding:8px 8px 8px 18px;background:#fff}textarea{flex:1;border:0;resize:none;outline:none;max-height:200px;padding:8px 0;line-height:1.4;background:transparent}.send{width:36px;height:36px;border-radius:50%;border:0;background:#d7d7d7;color:#fff;cursor:pointer;display:grid;place-items:center;flex:none;margin-bottom:1px}.send.ready{background:#0d0d0d}.send:disabled{cursor:default}.hint{max-width:var(--max);margin:8px auto 0;text-align:center;color:var(--muted);font-size:12px}.dots span{display:inline-block;width:6px;height:6px;margin-right:4px;border-radius:50%;background:#b0b0b0;animation:blink 1.2s infinite}.dots span:nth-child(2){animation-delay:.15s}.dots span:nth-child(3){animation-delay:.3s}@keyframes blink{0%,80%,to{opacity:.25}40%{opacity:1}}@media (max-width:720px){.app{flex-direction:column}aside{width:100%;max-height:220px;border-right:0;border-bottom:1px solid var(--line)}.side-foot{margin-top:0}main.is-empty{justify-content:flex-start;padding:28px 0 12px}}