:root{color-scheme:light dark;--bg: #f5f6f8;--card: #fff;--text: #111;--muted: #666;--primary: #1677ff;--border: #e5e5e5;--user-bubble: #1677ff;--agent-bubble: #fff;--danger: #cf1322;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif}@media(prefers-color-scheme:dark){:root{--bg: #0f0f10;--card: #1c1c1e;--text: #f2f2f7;--muted: #8e8e93;--border: #2c2c2e;--agent-bubble: #2c2c2e}}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{background:var(--bg);color:var(--text)}.app{max-width:720px;margin:0 auto;height:100%;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:2}.topbar h1{font-size:17px;margin:0;flex:1}.topbar button,.btn{border:none;background:var(--primary);color:#fff;border-radius:8px;padding:8px 12px;font-size:14px;cursor:pointer}.btn.ghost{background:transparent;color:var(--primary);border:1px solid var(--border)}.btn.danger{background:var(--danger)}.tabs{display:flex;gap:8px;padding:8px 16px}.tabs button{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:999px;padding:6px 12px;cursor:pointer}.tabs button.active{background:var(--primary);color:#fff;border-color:var(--primary)}.list{flex:1;overflow:auto;padding:8px 16px 24px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px;margin-bottom:10px;cursor:pointer}.card .row{display:flex;justify-content:space-between;gap:8px;align-items:center}.badge{font-size:11px;padding:2px 8px;border-radius:999px;background:#e6f4ff;color:#0958d9}.badge.warn{background:#fff7e6;color:#d46b08}.badge.muted{background:#f0f0f0;color:#666}.preview{color:var(--muted);font-size:13px;margin-top:6px}.unread{width:8px;height:8px;border-radius:50%;background:#ff4d4f;display:inline-block}.empty,.error,.hint{padding:32px 16px;text-align:center;color:var(--muted)}.chat{flex:1;display:flex;flex-direction:column;min-height:0}.messages{flex:1;overflow:auto;padding:12px 16px;display:flex;flex-direction:column;gap:10px}.bubble{max-width:82%;padding:10px 12px;border-radius:14px;font-size:15px;line-height:1.4;white-space:pre-wrap;word-break:break-word}.bubble.user{align-self:flex-end;background:var(--user-bubble);color:#fff;border-bottom-right-radius:4px}.bubble.agent,.bubble.system{align-self:flex-start;background:var(--agent-bubble);border:1px solid var(--border);border-bottom-left-radius:4px}.bubble.system{align-self:center;font-size:12px;color:var(--muted);background:transparent;border:none}.time{font-size:11px;color:var(--muted);margin-top:4px}.composer{display:flex;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--border);background:var(--card)}.composer textarea{flex:1;resize:none;min-height:40px;max-height:120px;border:1px solid var(--border);border-radius:10px;padding:8px 10px;font:inherit;background:var(--bg);color:var(--text)}.composer .icon-btn{width:40px;height:40px;border-radius:10px;border:1px solid var(--border);background:var(--bg);cursor:pointer}.sheet{background:var(--card);border-top:1px solid var(--border);padding:16px}.sheet select,.sheet input,.sheet textarea{width:100%;margin:8px 0 12px;padding:10px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);font:inherit}