:root{--bg:#0f1115;--panel:#16191f;--panel2:#1d2129;--line:#2a2f39;--text:#e8eaed;--muted:#9aa0aa;--accent:#6d8bff;--user:#262b35;--err:#ff6b6b;--ok:#19c39c;--radius:14px}
@media (prefers-color-scheme:light){:root{--bg:#f7f7f8;--panel:#fff;--panel2:#f0f1f3;--line:#e3e5e8;--text:#1d1f23;--muted:#6b7280;--user:#eceef2}}
*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}
button{font:inherit;color:inherit;cursor:pointer}.hidden{display:none!important}.muted{color:var(--muted)}.small{font-size:12px}.err{color:var(--err);min-height:1.4em;margin:8px 0 0}
.login{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:20px}
.login-card{width:100%;max-width:340px;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:32px 26px;text-align:center}
.login-card h1{margin:12px 0 4px;font-size:22px}.login-logo{width:56px;height:56px}
.login-card input{width:100%;margin-top:18px;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--panel2);color:var(--text);font-size:17px;text-align:center;letter-spacing:4px;outline:none}
.login-card input:focus{border-color:var(--accent)}
.login-card button{width:100%;margin-top:12px;padding:12px;border:0;border-radius:12px;background:var(--accent);color:#fff;font-weight:600}
.app{display:flex;height:100dvh;overflow:hidden}
.side{width:280px;flex:none;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column}
.side-head{display:flex;align-items:center;gap:10px;padding:16px;font-weight:600}.side-logo{width:28px;height:28px}.side-head .icon-btn{margin-left:auto}
.agent-list{flex:1;overflow:auto;padding:4px 10px 10px}
.agent{margin-bottom:10px}.agent-head{display:flex;align-items:center;gap:10px;padding:10px;border-radius:12px;cursor:pointer;user-select:none}
.agent-head:hover{background:var(--panel2)}.agent-head.active{background:var(--panel2)}
.avatar{width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;flex:none}
.agent-name{font-weight:600}.agent-desc{font-size:12px;color:var(--muted)}.agent-meta{flex:1;min-width:0}
.new-btn{border:1px solid var(--line);background:transparent;border-radius:8px;padding:2px 8px;font-size:13px;color:var(--muted)}.new-btn:hover{color:var(--text);border-color:var(--muted)}
.chat-list{margin:2px 0 0 18px;border-left:1px solid var(--line);padding-left:8px}
.chat-item{display:flex;align-items:center;gap:6px;padding:7px 10px;border-radius:9px;cursor:pointer;font-size:14px;color:var(--muted);white-space:nowrap;overflow:hidden}
.chat-item span{overflow:hidden;text-overflow:ellipsis;flex:1}.chat-item:hover{background:var(--panel2);color:var(--text)}.chat-item.active{background:var(--panel2);color:var(--text)}
.spin{width:8px;height:8px;border-radius:50%;background:var(--ok);flex:none;animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.25}}
.side-foot{padding:12px 16px;border-top:1px solid var(--line)}.link-btn{background:none;border:0;color:var(--muted);padding:0}.link-btn:hover{color:var(--text)}
.main{flex:1;min-width:0;display:flex;flex-direction:column;position:relative}
.top{display:flex;align-items:center;gap:8px;padding:10px 16px;border-bottom:1px solid var(--line);min-height:54px}
.top-title{flex:1;min-width:0;display:flex;align-items:center;gap:8px;font-weight:600;overflow:hidden;white-space:nowrap}.top-title span:last-child{overflow:hidden;text-overflow:ellipsis}
.dot{width:10px;height:10px;border-radius:50%;background:var(--muted);flex:none}
.icon-btn{background:none;border:0;width:34px;height:34px;border-radius:9px;font-size:16px;color:var(--muted);flex:none}.icon-btn:hover{background:var(--panel2);color:var(--text)}
.msgs{flex:1;overflow-y:auto;padding:24px 16px 12px;scroll-behavior:smooth}
.empty{max-width:560px;margin:12vh auto 0;text-align:center}.empty h2{font-size:26px;margin:0 0 8px}
.msg{max-width:820px;margin:0 auto 22px;display:flex;gap:12px}
.msg.user{justify-content:flex-end}.msg.user .bubble{background:var(--user);border-radius:18px 18px 4px 18px;padding:10px 14px;max-width:85%}
.msg.assistant .bubble{flex:1;min-width:0}
.bubble{word-wrap:break-word;overflow-wrap:anywhere}.bubble p{margin:0 0 .7em}.bubble p:last-child{margin-bottom:0}
.bubble pre{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:10px 12px;overflow-x:auto;font-size:13px;line-height:1.5}
.bubble code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:var(--panel2);padding:1px 5px;border-radius:5px}.bubble pre code{background:none;padding:0}
.bubble ul,.bubble ol{padding-left:1.4em;margin:.3em 0 .7em}.bubble a{color:var(--accent)}.bubble h1,.bubble h2,.bubble h3{font-size:1.05em;margin:.8em 0 .4em}
.user-text{white-space:pre-wrap}
.atts{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.msg.user .atts{justify-content:flex-end}
.chip{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:5px 10px;font-size:13px;max-width:100%;color:var(--text);text-decoration:none}
.chip .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:240px}.chip .sz{color:var(--muted);font-size:12px}
a.chip:hover{border-color:var(--accent)}.chip .x{background:none;border:0;color:var(--muted);padding:0 0 0 2px}
.files{margin-top:12px;border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--panel)}
.files-title{font-size:13px;color:var(--muted);margin-bottom:6px}.files .atts{margin:0}
.badge{font-size:11px;border-radius:6px;padding:0 5px;background:var(--panel2);color:var(--ok)}
.steps{font-size:12.5px;color:var(--muted);margin-bottom:8px}.steps summary{cursor:pointer;user-select:none}
.steps ol{margin:6px 0 0;padding-left:1.4em;max-height:260px;overflow:auto}.steps li{font-family:ui-monospace,Menlo,Consolas,monospace;white-space:pre-wrap;word-break:break-all;margin:2px 0}
.thinking{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:8px;margin-top:6px}
.typing{display:inline-flex;gap:3px}.typing i{width:6px;height:6px;border-radius:50%;background:var(--muted);animation:pulse 1.2s infinite}.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
.msg.error .bubble{border-left:3px solid var(--err);padding-left:10px}
.composer-wrap{padding:8px 16px calc(12px + env(safe-area-inset-bottom));max-width:852px;width:100%;margin:0 auto}
.pending{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}
.chip .bar{height:3px;background:var(--accent);border-radius:2px;transition:width .2s}
.composer{display:flex;align-items:flex-end;gap:6px;background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:6px}
.composer:focus-within{border-color:var(--muted)}
.composer textarea{flex:1;border:0;outline:0;background:transparent;color:var(--text);resize:none;font:inherit;font-size:16px;padding:7px 4px;max-height:40vh;min-height:24px}
.send{width:36px;height:36px;border-radius:50%;border:0;background:var(--text);color:var(--bg);font-size:18px;font-weight:700;flex:none}.send:disabled{opacity:.35;cursor:default}
.stop{background:var(--err);color:#fff;font-size:13px}.attach{font-size:22px;border-radius:50%}
.hint{text-align:center;margin-top:6px}
.drop{position:absolute;inset:10px;border:2px dashed var(--accent);border-radius:18px;background:rgba(109,139,255,.08);display:flex;align-items:center;justify-content:center;font-size:18px;pointer-events:none;z-index:5}
.scrim{display:none}.only-mobile{display:none}
@media (max-width:760px){
  .only-mobile{display:inline-block}
  .side{position:fixed;z-index:20;top:0;bottom:0;left:0;width:84vw;max-width:320px;transform:translateX(-100%);transition:transform .2s}
  .side.open{transform:none}.scrim.open{display:block;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:15}
  .msgs{padding:16px 12px 8px}.composer-wrap{padding-left:10px;padding-right:10px}.hint{display:none}.msg.user .bubble{max-width:92%}
}