/* ===== AI 助手窗口 ===== */
  #aiFab{position:fixed;right:24px;bottom:24px;z-index:60;
    background:linear-gradient(135deg,var(--accent),#7c3aed);color:#fff;
    border-radius:30px;padding:12px 20px;font-weight:700;font-size:14px;
    box-shadow:0 8px 24px #0007;display:flex;align-items:center;gap:8px}
  #aiFab .dot{width:8px;height:8px;border-radius:50%;background:#5fe08a}
  #aiPanel{position:fixed;top:0;right:0;height:100vh;width:420px;max-width:92vw;
    background:var(--panel);border-left:1px solid var(--line);z-index:70;
    display:flex;flex-direction:column;transform:translateX(105%);
    transition:transform .28s ease;box-shadow:-12px 0 36px #0008}
  #aiPanel.show{transform:translateX(0)}
  .ai-head{padding:14px 16px;border-bottom:1px solid var(--line);
    display:flex;align-items:center;gap:10px}
  .ai-head .logo{width:30px;height:30px;border-radius:8px;font-size:14px}
  .ai-head h3{margin:0;font-size:15px;flex:1}
  .ai-head .sub2{color:var(--muted);font-size:11.5px;margin-top:2px}
  .ai-head .x{background:var(--panel2);border:1px solid var(--line);color:var(--txt);
    border-radius:8px;width:30px;height:30px;cursor:pointer;font-size:16px}
  .ai-tools{display:flex;gap:8px;flex-wrap:wrap;padding:10px 14px;
    border-bottom:1px solid var(--line);background:var(--panel2)}
  .ai-msgs{flex:1;overflow:auto;padding:16px 14px;display:flex;
    flex-direction:column;gap:12px}
  .msg{max-width:88%;padding:10px 13px;border-radius:12px;font-size:13.5px;
    line-height:1.65;white-space:pre-wrap;word-break:break-word}
  .msg.user{align-self:flex-end;background:var(--accent);color:#fff;
    border-bottom-right-radius:4px}
  .msg.bot{align-self:flex-start;background:var(--panel2);border:1px solid var(--line);
    border-bottom-left-radius:4px}
  .msg.bot.changed{border-color:#1f6f3f;background:#10271a}
  .msg.sys{align-self:center;color:var(--muted);font-size:12px;background:transparent}
  .msg-artifacts{margin-top:8px;display:flex;flex-wrap:wrap;gap:6px}
  .msg-artifacts a{font-size:12px;padding:4px 10px;border-radius:8px;
    background:var(--accent-dim);color:var(--accent);border:1px solid var(--accent);
    text-decoration:none}
  .msg-artifacts a:hover{filter:brightness(1.1)}
  .ai-input{border-top:1px solid var(--line);padding:10px 12px;display:flex;gap:8px}
  .ai-input textarea{flex:1;resize:none;height:46px;background:var(--panel2);
    color:var(--txt);border:1px solid var(--line);border-radius:10px;
    padding:10px;font-family:inherit;font-size:13.5px}
  .ai-input button{padding:0 16px}
  .ai-hint{padding:4px 14px 0;color:var(--muted);font-size:11.5px}