:root{--bg: #0f1115;--bg-2: #161922;--bg-3: #1e222d;--border: #2a2f3a;--text: #e6e8ec;--text-dim: #9aa3b2;--accent: #6c8cff;--accent-dim: #3a4a8a;--user-bubble: #243049;--danger: #ff6b6b;--radius: 10px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{background:var(--bg);color:var(--text)}.layout{display:flex;height:100%}.sidebar{width:270px;flex-shrink:0;background:var(--bg-2);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:12px;gap:10px;overflow-y:auto}.new-chat-btn{width:100%;padding:10px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);font-size:14px;font-weight:600;cursor:pointer}.new-chat-btn:hover{filter:brightness(1.08)}.chat-history{display:flex;flex-direction:column;gap:2px}.history-item{display:flex;align-items:center;border-radius:8px}.history-item:hover,.history-item.active{background:var(--bg-3)}.history-label{flex:1;text-align:left;background:none;border:none;color:var(--text);padding:9px 10px;font-size:13px;cursor:pointer;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.history-del{background:none;border:none;color:var(--text-dim);cursor:pointer;opacity:0;padding:6px 8px;font-size:12px}.history-item:hover .history-del{opacity:1}.history-del:hover{color:var(--danger)}.main-col{flex:1;display:flex;flex-direction:column;min-width:0}.topbar{display:flex;align-items:center;justify-content:flex-end;gap:10px;padding:10px 16px;border-bottom:1px solid var(--border)}.model-pill{font-size:12px;color:var(--text-dim);background:var(--bg-2);border:1px solid var(--border);border-radius:999px;padding:4px 12px;cursor:pointer}.model-pill:hover{color:var(--text)}.icon-btn{background:none;border:none;color:var(--text-dim);font-size:18px;cursor:pointer;padding:4px 8px;border-radius:8px}.icon-btn:hover{background:var(--bg-3);color:var(--text)}.view{flex:1;min-height:0;overflow:hidden}.chat-wrap{height:100%;display:flex;flex-direction:column}.msg-list{flex:1;overflow-y:auto;padding:24px 0}.empty{text-align:center;color:var(--text-dim);margin-top:18vh}.empty h2{color:var(--text)}.msg{display:flex;padding:6px 24px;max-width:820px;margin:0 auto;width:100%}.msg-user{justify-content:flex-end}.msg-assistant{justify-content:flex-start}.bubble{max-width:88%;padding:10px 14px;border-radius:14px;line-height:1.55}.msg-user .bubble{background:var(--user-bubble);border-bottom-right-radius:4px}.msg-assistant .bubble{background:var(--bg-2);border:1px solid var(--border);border-bottom-left-radius:4px}.body{white-space:pre-wrap;word-wrap:break-word}.msg-assistant .body{white-space:normal}.body p:first-child{margin-top:0}.body p:last-child{margin-bottom:0}.body pre{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:12px;overflow-x:auto}.body code{background:var(--bg);padding:1px 5px;border-radius:4px;font-size:.9em}.body pre code{background:none;padding:0}.body a{color:var(--accent)}.cursor{color:var(--accent);animation:blink 1s steps(2,start) infinite}@keyframes 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8px}.composer-input{flex:1;resize:none;background:none;border:none;color:var(--text);font:inherit;font-size:15px;padding:8px 4px;max-height:200px;outline:none}.send-btn{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:9px 18px;font-weight:600;cursor:pointer}.send-btn:hover{filter:brightness(1.08)}.composer-status{color:var(--danger);font-size:12px;min-height:16px;margin-top:6px}.settings{max-width:680px;margin:0 auto;padding:28px 24px;height:100%;overflow-y:auto}.settings h1{margin-top:0}.field{margin-bottom:26px}.field label{font-weight:600;display:block}.hint{color:var(--text-dim);font-size:13px;margin:4px 0 10px}.settings input,.settings textarea{width:100%;background:var(--bg-2);border:1px solid var(--border);border-radius:8px;color:var(--text);font:inherit;padding:10px;outline:none}.settings input:focus,.settings textarea:focus{border-color:var(--accent)}.row{display:flex;gap:10px;align-items:center}.row 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