:root{
  --bg:#0f1216; --panel:#171c22; --panel2:#1e242c; --line:#2a333d;
  --text:#e8edf3; --muted:#93a1b1; --accent:#3ea6ff; --ok:#3ecf8e;
  --warn:#ffb020; --err:#ff6b6b; --radius:14px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--text); display:flex; flex-direction:column;
  font:15px/1.55 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}
.topbar{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:12px 22px; border-bottom:1px solid var(--line); background:var(--panel);
  position:sticky; top:0; z-index:5;
}
.brand{display:flex; align-items:baseline; gap:12px; flex-wrap:wrap}
.logo{font-weight:700; letter-spacing:.14em; color:var(--accent)}
.sub{color:var(--muted); font-size:13px}
.controls{display:flex; align-items:center; gap:10px}
.controls label{color:var(--muted); font-size:13px}
select, button, textarea{font:inherit}
select{
  background:var(--panel2); color:var(--text); border:1px solid var(--line);
  border-radius:10px; padding:7px 10px; min-width:210px;
}
button{
  background:var(--panel2); color:var(--text); border:1px solid var(--line);
  border-radius:10px; padding:8px 14px; cursor:pointer; transition:.15s;
}
button:hover{border-color:var(--accent)}
button:disabled{opacity:.5; cursor:default}
.dl{
  color:var(--accent); text-decoration:none; font-size:13.5px; padding:8px 12px;
  border:1px solid rgba(62,166,255,.35); border-radius:10px; background:rgba(62,166,255,.08);
}
.dl:hover{background:rgba(62,166,255,.16)}

.chat{flex:1; overflow-y:auto; padding:26px 22px 10px; max-width:980px; width:100%; margin:0 auto}
.intro h1{font-size:22px; margin:10px 0 6px}
.intro p{color:var(--muted); margin:0 0 14px}
.examples{display:flex; flex-wrap:wrap; gap:8px; margin:14px 0}
.ex{font-size:13px; padding:7px 12px; color:var(--muted)}
.ex:hover{color:var(--text)}
.hint{font-size:13px; color:#6f7d8c}

.msg{display:flex; gap:12px; margin:18px 0; align-items:flex-start}
.msg .who{flex:0 0 34px; height:34px; border-radius:10px; display:grid; place-items:center;
  font-size:12px; font-weight:700; background:var(--panel2); color:var(--muted)}
.msg.user .who{background:#24303c; color:var(--accent)}
.bubble{background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  padding:14px 16px; max-width:100%; overflow-wrap:anywhere}
.msg.user .bubble{background:#1b2632}

.status{display:inline-flex; align-items:center; gap:6px; font-size:12px; font-weight:600;
  padding:3px 9px; border-radius:999px; margin-bottom:8px; letter-spacing:.02em}
.status.answered{background:rgba(62,207,142,.14); color:var(--ok)}
.status.clarify{background:rgba(62,166,255,.14); color:var(--accent)}
.status.not_found,.status.out_of_scope{background:rgba(255,107,107,.14); color:var(--err)}
.status.other_model{background:rgba(255,176,32,.16); color:var(--warn)}

.answer p{margin:0 0 10px}
.answer ol,.answer ul{margin:6px 0 10px; padding-left:22px}
.answer code{background:#0c1015; padding:1px 5px; border-radius:5px}

.model-tag{display:inline-block; margin-top:6px; font-size:12px; color:var(--muted);
  border:1px dashed var(--line); padding:2px 8px; border-radius:8px}

.warnings{margin-top:12px; border-left:3px solid var(--warn); background:rgba(255,176,32,.07);
  padding:10px 12px; border-radius:0 10px 10px 0}
.warnings b{color:var(--warn); font-size:13px}
.warnings ul{margin:6px 0 0; padding-left:20px}
.warnings li{margin:4px 0; font-size:13.5px}

.sources{margin-top:14px}
.sources h4{margin:0 0 8px; font-size:12px; text-transform:uppercase; letter-spacing:.08em; color:var(--muted)}
.src{background:var(--panel2); border:1px solid var(--line); border-radius:10px; padding:10px 12px; margin:8px 0}
.src .ref{font-weight:600; font-size:13.5px; color:var(--accent)}
.src .doc{font-size:12px; color:var(--muted); margin:2px 0 6px}
.src .quote{font-size:13px; color:#c6d2df; border-left:2px solid var(--line); padding-left:10px; margin:6px 0 0}
.src details summary{cursor:pointer; color:var(--muted); font-size:12.5px; margin-top:6px}

.contact{margin-top:12px; font-size:13.5px; background:rgba(62,166,255,.08);
  border:1px solid rgba(62,166,255,.25); padding:10px 12px; border-radius:10px}

.composer{display:flex; gap:10px; padding:12px 22px; border-top:1px solid var(--line);
  background:var(--panel); position:sticky; bottom:0; max-width:980px; width:100%; margin:0 auto}
textarea{flex:1; resize:none; background:var(--panel2); color:var(--text);
  border:1px solid var(--line); border-radius:12px; padding:11px 13px; max-height:180px}
textarea:focus{outline:none; border-color:var(--accent)}
#send{background:var(--accent); color:#06121d; border:none; font-weight:700; padding:0 22px}
#send:hover{filter:brightness(1.08)}

.footer{text-align:center; font-size:12px; color:#5d6a78; padding:8px 22px 14px; max-width:980px; margin:0 auto}

.typing{display:inline-flex; gap:4px; align-items:center; color:var(--muted); font-size:13px}
.typing i{width:6px; height:6px; border-radius:50%; background:var(--muted); animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.2}40%{opacity:1}}
@media (max-width:640px){
  .sub{display:none}
  select{min-width:140px}
}