:root{
  --bg:#f6f7f9;--panel:#fff;--side:#eef0f3;--text:#1f2328;--muted:#6b7280;--line:#d9dde3;
  --accent:#2563eb;--accent-text:#fff;--user:#dbeafe;--assist:#fff;--danger:#dc2626;--ok:#16a34a;--off:#9ca3af;
  --code:#f1f3f5;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#14161a;--panel:#1b1e23;--side:#181b20;--text:#e6e8eb;--muted:#9aa3af;--line:#2d323a;
    --accent:#3b82f6;--user:#1e3a5f;--assist:#1f2329;--danger:#ef4444;--code:#12141a;}
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--text);font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}
.hidden{display:none!important}
button{font:inherit;color:inherit;cursor:pointer}
button:disabled{opacity:.5;cursor:default}
.login-msg{max-width:480px;margin:20vh auto;padding:0 16px;text-align:center;color:var(--muted)}
.app{display:flex;height:100%;height:100dvh}
.sidebar{width:280px;flex:none;background:var(--side);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.side-head{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line)}
.user-name{font-weight:600}
.link-btn{background:none;border:0;color:var(--muted);padding:2px 4px}
.seat-list{flex:1;overflow-y:auto;padding:8px 0}
.role-title{padding:8px 16px 4px;font-size:12px;color:var(--muted);letter-spacing:.04em}
.seat-row{display:flex;align-items:center;gap:8px;width:100%;padding:8px 16px;background:none;border:0;text-align:left}
.seat-row:hover{background:rgba(127,127,127,.12)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--off);flex:none}
.dot.on{background:var(--ok)}
.seat-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sess-box{padding:0 8px 6px 28px}
.sess-new{width:100%;margin:4px 0;padding:6px;border:1px dashed var(--line);border-radius:6px;background:none;color:var(--accent)}
.sess-row{display:flex;align-items:center;gap:4px;border-radius:6px}
.sess-row.active{background:rgba(37,99,235,.15)}
.sess-btn{flex:1;min-width:0;padding:6px 8px;background:none;border:0;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sess-state{font-size:11px;color:var(--accent)}
.sess-arch{background:none;border:0;color:var(--muted);padding:4px 6px;font-size:12px}
.arch-toggle{display:block;margin:6px 0 2px;padding:4px 8px;background:none;border:0;color:var(--muted);font-size:12px}
.hint{padding:4px 8px;color:var(--muted);font-size:13px}
.main{flex:1;min-width:0;display:flex;flex-direction:column;background:var(--bg)}
.top{display:flex;align-items:center;gap:8px;padding:10px 16px;border-bottom:1px solid var(--line);background:var(--panel)}
.drawer-btn{display:none}
.top-title{flex:1;min-width:0;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.top-state{font-size:12px;color:var(--muted)}
.messages{flex:1;overflow-y:auto;overflow-x:hidden;padding:16px;display:flex;flex-direction:column;gap:12px}
.empty{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);color:var(--muted);pointer-events:none;padding:0 16px;text-align:center}
.empty:empty{display:none}
.msg{max-width:min(720px,92%);display:flex;flex-direction:column;gap:4px}
.msg.user{align-self:flex-end;align-items:flex-end}
.msg.assistant{align-self:flex-start}
.msg.notice{align-self:center;max-width:90%}
.bubble{padding:8px 12px;border-radius:12px;border:1px solid var(--line);background:var(--assist);white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word}
.msg.user .bubble{background:var(--user);border-color:transparent}
.notice-text{font-size:12px;color:var(--muted);text-align:center;white-space:pre-wrap;overflow-wrap:anywhere}
.flag{font-size:12px;color:var(--danger)}
.bubble pre{margin:6px 0;padding:8px 10px;background:var(--code);border-radius:6px;overflow-x:auto;white-space:pre;font:13px/1.45 ui-monospace,Menlo,Consolas,monospace}
.bubble pre code{font:inherit}
.menu-pre{white-space:pre;overflow-x:auto}
.proc{font-size:13px;color:var(--muted)}
.proc summary{cursor:pointer;user-select:none}
.proc-body{margin:4px 0 0;padding:6px 8px;border-left:2px solid var(--line);white-space:pre-wrap;overflow-wrap:anywhere;max-height:200px;overflow-y:auto}
.menu-btns{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.menu-btns button{padding:6px 12px;border:1px solid var(--line);border-radius:6px;background:var(--panel)}
.menu-btns button.primary{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}
.menu-btns button.cancel{color:var(--danger)}
.composer{padding:8px 16px 12px;border-top:1px solid var(--line);background:var(--panel)}
.composer-row{display:flex;gap:8px;align-items:flex-end}
.composer textarea{flex:1;min-width:0;resize:none;max-height:160px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--text);font:inherit}
.icon-btn{width:36px;height:36px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}
.send-btn,.stop-btn{height:36px;padding:0 14px;border:0;border-radius:8px;color:#fff}
.send-btn{background:var(--accent)}
.stop-btn{background:var(--danger)}
.cmd-wrap{position:relative}
.cmd-menu{position:absolute;bottom:42px;left:0;min-width:140px;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,.2);z-index:5;overflow:hidden}
.cmd-menu button{display:block;width:100%;padding:8px 12px;border:0;background:none;text-align:left}
.cmd-menu button:hover{background:rgba(127,127,127,.15)}
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:9}
@media (max-width:720px){
  .drawer-btn{display:inline-block}
  .sidebar{position:fixed;left:0;top:0;bottom:0;z-index:10;transform:translateX(-100%);transition:transform .2s;width:min(300px,86vw)}
  .sidebar.open{transform:none}
  .messages{padding:12px 16px}
  .composer{padding:8px 16px 12px}
  .msg{max-width:100%}
}