:root{--bg:#1d1f23;--panel:#262a30;--ink:#e8e6e1;--accent:#d98a3d;--muted:#9aa0a8}
*{box-sizing:border-box}body{margin:0;font:15px/1.5 system-ui;background:var(--bg);color:var(--ink)}
.login{max-width:320px;margin:18vh auto;display:flex;flex-direction:column;gap:10px;padding:24px;background:var(--panel);border-radius:12px}
.login h1{color:var(--accent);margin:0 0 8px}.login input,.login button{padding:10px;border-radius:8px;border:1px solid #3a3f47;background:#1a1c20;color:var(--ink)}
.login button{background:var(--accent);color:#1a1c20;border:0;font-weight:600;cursor:pointer}.err{color:#e06b6b}
#shell{display:grid;grid-template-columns:1fr 380px;height:100vh}
#docpane{display:flex;flex-direction:column;border-right:1px solid #33383f}
#doctitle{padding:12px 16px;background:transparent;border:0;border-bottom:1px solid #33383f;color:var(--ink);font-size:18px;font-weight:600}
#docbody{flex:1;padding:16px;background:transparent;border:0;color:var(--ink);resize:none;font:15px/1.6 Georgia,serif}
#side{display:flex;flex-direction:column;background:var(--panel)}
#chat{flex:1;overflow:auto;padding:14px;display:flex;flex-direction:column;gap:10px}
.msg{padding:8px 12px;border-radius:10px;max-width:92%}.msg.user{align-self:flex-end;background:#33383f}
.msg.bot{align-self:flex-start;background:#2f343b;border-left:3px solid var(--accent)}
.trace{font-size:13px;color:var(--muted);white-space:pre-wrap}
#composer{display:flex;gap:8px;padding:10px;border-top:1px solid #33383f}
#prompt{flex:1;padding:10px;border-radius:8px;border:1px solid #3a3f47;background:#1a1c20;color:var(--ink)}
button.go{background:var(--accent);color:#1a1c20;border:0;border-radius:8px;padding:0 14px;font-weight:600;cursor:pointer}
.bar{display:flex;gap:8px;align-items:center;padding:8px 12px;border-bottom:1px solid #33383f;font-size:13px;color:var(--muted)}
.who{margin-left:auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
select,#docs{background:#1a1c20;color:var(--ink);border:1px solid #3a3f47;border-radius:6px;padding:4px;max-width:46vw}
button.icon{background:#1a1c20;border:1px solid #3a3f47;border-radius:8px;font-size:18px;line-height:1;padding:0 10px;cursor:pointer;color:var(--ink)}
button.icon:active{background:#2f343b}
.chatimg{display:block;margin-top:6px;max-width:100%;border-radius:10px;border:1px solid #3a3f47}
/* mobile: stack the document over the chat, keep the chat usable one-handed */
@media (max-width:760px){
  #shell{grid-template-columns:1fr;grid-template-rows:40vh 60vh;height:100vh}
  #docpane{border-right:0;border-bottom:1px solid #33383f}
  #side{min-height:0}
  #composer{position:sticky;bottom:0}
  #prompt{min-width:0}
  .msg{max-width:96%}
}