:root{--bg: #0f1115;--panel: #161922;--panel-2: #1d2230;--border: #2a3040;--text: #e6e8ee;--muted: #8b93a7;--accent: #4f7cff;--accent-fg: #ffffff;--user: #2a3550;--assistant: #1d2230;--error: #ff6b6b}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}button{font:inherit;cursor:pointer}.muted{color:var(--muted)}.error{color:var(--error);background:#ff6b6b14;border:1px solid rgba(255,107,107,.3);border-radius:8px;padding:6px 10px;margin:8px 0;font-size:13px}.centered{height:100%;display:flex;align-items:center;justify-content:center}button.primary{background:var(--accent);color:var(--accent-fg);border:none;border-radius:8px;padding:9px 14px;font-weight:600}button.primary:disabled{opacity:.5;cursor:default}button.primary.sm{padding:5px 10px;font-size:13px}button.link{background:none;border:none;color:var(--muted);text-decoration:underline}.login{width:320px;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:28px;display:flex;flex-direction:column;gap:12px}.login h1{margin:0 0 8px;font-size:20px;text-align:center}.login input{background:var(--panel-2);border:1px solid var(--border);border-radius:8px;color:var(--text);padding:10px 12px}.app{display:grid;grid-template-columns:260px 1fr;height:100%}.sidebar{background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.sidebar-head{display:flex;align-items:center;justify-content:space-between;padding:14px;border-bottom:1px solid var(--border)}.conv-list{list-style:none;margin:0;padding:6px;overflow-y:auto;flex:1}.conv-list li{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:9px 10px;border-radius:8px;cursor:pointer}.conv-list li:hover{background:var(--panel-2)}.conv-list li.active{background:var(--user)}.conv-list li.empty{cursor:default;font-size:13px}.conv-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.del{background:none;border:none;color:var(--muted);font-size:18px;line-height:1;opacity:0}.conv-list li:hover .del{opacity:1}.main{display:flex;flex-direction:column;min-width:0;min-height:0}.topbar{display:flex;align-items:center;justify-content:flex-end;gap:12px;padding:10px 16px;border-bottom:1px solid var(--border)}.chat{display:flex;flex-direction:column;flex:1;min-height:0}.messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px}.bubble{display:flex}.bubble.user{justify-content:flex-end}.bubble-body{max-width:min(70ch,80%);padding:10px 14px;border-radius:12px;white-space:pre-wrap;word-wrap:break-word}.bubble.user .bubble-body{background:var(--user)}.bubble.assistant .bubble-body{background:var(--assistant);border:1px solid var(--border)}.cursor{color:var(--muted);animation:blink 1s steps(2,start) infinite}@keyframes blink{to{visibility:hidden}}.composer{display:flex;gap:10px;padding:14px 16px;border-top:1px solid var(--border)}.composer textarea{flex:1;resize:none;background:var(--panel-2);border:1px solid var(--border);border-radius:10px;color:var(--text);padding:10px 12px;font:inherit}.composer textarea:disabled{opacity:.6}