:root{
  --paper:#f4f1ea;
  --card:#fffdf9;
  --ink:#1c1a17;
  --muted:#6f6a61;
  --line:#ddd6ca;
  --accent:#8a3324;
  --accent-soft:#f2e4dc;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:16px/1.65 ui-sans-serif,-apple-system,"PingFang SC","Hiragino Sans GB","Noto Sans SC",sans-serif;
}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

.app{display:flex;flex-direction:column;height:100dvh;max-width:780px;margin:0 auto;padding:0 20px}

.top{display:flex;align-items:center;justify-content:space-between;
  padding:18px 0 14px;border-bottom:1px solid var(--line);flex:0 0 auto}
.brand{display:flex;align-items:baseline;gap:9px;font-size:15px}
.mark{font-weight:650;letter-spacing:.04em}
.sep{color:var(--line)}
.sub{color:var(--muted)}
.ghost{background:transparent;border:1px solid var(--line);color:var(--muted);
  font:inherit;font-size:13px;padding:5px 12px;border-radius:100px;cursor:pointer}
.ghost:hover{color:var(--ink);border-color:#c3bbac;background:#fbf8f2}

.thread{flex:1 1 auto;overflow-y:auto;padding:26px 0 8px}
.intro{max-width:560px;margin:8vh auto 0;text-align:left}
.intro h1{font-size:26px;line-height:1.3;margin:0 0 10px;letter-spacing:-.01em}
.intro p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.75}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.chips button{background:transparent;color:var(--muted);border:1px solid var(--line);
  padding:7px 13px;font:inherit;font-size:13px;border-radius:100px;cursor:pointer}
.chips button:hover{color:var(--ink);border-color:#c3bbac;background:#fbf8f2}

.actions{display:flex;align-items:center;gap:8px}
.dl{position:relative}
.dl summary{list-style:none;cursor:pointer;border:1px solid var(--line);color:var(--muted);
  font-size:13px;padding:5px 12px;border-radius:100px}
.dl summary::-webkit-details-marker{display:none}
.dl summary:hover{color:var(--ink);border-color:#c3bbac;background:#fbf8f2}
.dl .menu{position:absolute;right:0;top:calc(100% + 6px);background:var(--card);border:1px solid var(--line);
  border-radius:4px;box-shadow:0 8px 24px rgba(28,26,23,.10);padding:6px;min-width:190px;z-index:20}
.dl .menu a{display:flex;justify-content:space-between;gap:16px;padding:8px 10px;border-radius:3px;
  color:var(--ink);text-decoration:none;font-size:13.5px;white-space:nowrap}
.dl .menu a:hover{background:#f4efe5}
.dl .menu span{color:#a9a196;font-family:var(--mono);font-size:12px}

.msg{margin:0 0 26px;display:flex;flex-direction:column}
.msg.user{align-items:flex-end}
.msg.user .bubble{background:var(--ink);color:#f7f4ee;padding:10px 15px;border-radius:10px 10px 2px 10px;
  max-width:85%;font-size:15.5px}
.msg.bot .role{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);margin-bottom:8px}
.answer{font-size:16px;line-height:1.78}
.answer p{margin:0 0 12px}
.answer ul,.answer ol{margin:0 0 14px;padding-left:22px}
.answer li{margin:6px 0}
.answer strong{font-weight:650}
.answer code{font-family:var(--mono);font-size:.92em;background:#ece7dc;padding:1px 5px;border-radius:2px}
.answer .cite{font-family:var(--mono);font-size:11.5px;color:var(--accent);vertical-align:super;padding:0 1px}
.answer.refused{color:var(--muted)}

.note-line{font-size:12px;color:#9a9388;margin:-4px 0 10px;font-family:var(--mono)}

.sources{margin-top:12px;border-top:1px dashed var(--line);padding-top:10px}
.sources h3{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
  font-weight:500;margin:0 0 8px;font-family:var(--mono)}
.src{display:flex;gap:10px;align-items:baseline;padding:5px 0;font-size:13.5px;border-bottom:1px solid #f0ebe0}
.src .open{display:flex;gap:9px;align-items:baseline;text-decoration:none;flex:1;min-width:0}
.src .open:hover .tt{color:var(--ink);text-decoration:underline;text-decoration-color:#cbbfae}
.src .get{margin-left:auto;color:#a9a196;text-decoration:none;font-size:15px;padding:0 2px}
.src .get:hover{color:var(--accent)}
.src:last-child{border-bottom:none}
.src .n{font-family:var(--mono);font-size:11.5px;color:var(--accent);min-width:18px}
.src .pg{font-family:var(--mono);font-size:12px;background:var(--accent-soft);padding:1px 6px;border-radius:2px;white-space:nowrap}
.src .tt{color:var(--muted);font-size:13px}

.typing{display:inline-flex;gap:4px;padding:6px 0}
.typing i{width:6px;height:6px;border-radius:50%;background:#bdb5a8;animation:blink 1.1s infinite}
.typing i:nth-child(2){animation-delay:.15s}
.typing i:nth-child(3){animation-delay:.3s}
@keyframes blink{0%,100%{opacity:.35}50%{opacity:1}}

.composer{flex:0 0 auto;padding:10px 0 16px;background:linear-gradient(to top,var(--paper) 72%,transparent)}
.composer form{display:flex;gap:10px;align-items:flex-end;background:var(--card);
  border:1px solid var(--line);border-radius:6px;padding:8px 10px 8px 14px;
  box-shadow:0 2px 8px rgba(28,26,23,.04)}
.composer textarea{flex:1;border:none;background:transparent;resize:none;font:inherit;font-size:16px;
  line-height:1.55;padding:6px 0;max-height:132px;outline:none;color:var(--ink)}
.composer textarea::placeholder{color:#a9a196}
.composer form:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(138,51,36,.08)}
#send{background:var(--ink);color:#fbf9f4;border:1px solid var(--ink);border-radius:4px;
  font:inherit;font-size:14px;padding:8px 16px;cursor:pointer;flex:0 0 auto}
#send:hover{background:#33302a}
#send:disabled{opacity:.4;cursor:default}
.note{margin:9px 2px 0;font-size:11.5px;color:#a9a196;line-height:1.5}

@media (max-width:560px){
  .app{padding:0 14px}
  .intro{margin-top:6vh}
  .intro h1{font-size:22px}
  .msg.user .bubble{max-width:90%}
}.caret{color:var(--accent);animation:blink 1s steps(1) infinite;font-size:.85em}