:root {
  --text: #1c1917;
  --muted: #78716c;
  --border: #e7e5e4;
  --accent: #9f1239;
  --accent-soft: #fff1f2;
  --bg: #faf7f5;
  --user: #fff1f2;
  --bot: #1c1917;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, #ffe4e6 0%, transparent 50%),
    var(--bg);
  color: var(--text);
  font-size: 14px;
}
.top {
  display: flex; align-items: center; gap: 12px; padding: 12px 20px;
  background: rgba(255,255,255,0.92); border-bottom: 1px solid var(--border);
  flex-wrap: wrap; backdrop-filter: blur(8px);
}
.brand strong { font-size: 1rem; letter-spacing: -0.02em; }
.brand span { color: var(--muted); font-size: 0.82rem; margin-left: 8px; }
.badge {
  background: #1c1917; color: #fafaf9; border-radius: 4px;
  padding: 3px 8px; font-size: 0.7rem; font-weight: 600;
}
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.chips button {
  border: 1px solid var(--border); background: #fff; border-radius: 6px;
  padding: 5px 10px; cursor: pointer; font: inherit; color: var(--muted);
}
.chips button:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
main { max-width: 720px; margin: 0 auto; padding: 16px 18px 40px; display: grid; gap: 12px; }
.hint { color: var(--muted); font-size: 0.78rem; line-height: 1.5; }
.hint a { color: var(--accent); }
.log {
  background: #fff; border: 1px solid var(--border); border-radius: 4px 4px 16px 16px;
  min-height: 420px; padding: 16px; display: flex; flex-direction: column; gap: 12px;
  box-shadow: 0 12px 40px -24px rgba(28,25,23,0.35);
}
.msg {
  max-width: 92%; padding: 10px 12px; border-radius: 12px;
  white-space: pre-wrap; line-height: 1.55; font-size: 0.9rem;
}
.msg.user { align-self: flex-end; background: var(--user); border: 1px solid #fecdd3; }
.msg.bot {
  align-self: flex-start; background: #fafaf9; border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
}
.msg .err { color: #9f1239; font-weight: 600; }
.cites {
  margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--border);
  font-size: 0.78rem; color: #44403c;
  font-family: "Songti SC", "Noto Serif SC", Georgia, serif;
}
.cites div { margin: 4px 0; }
.cites mark { background: #ffe4e6; color: #9f1239; padding: 0 3px; border-radius: 2px; font-family: inherit; }
.composer { display: flex; gap: 8px; }
.composer input {
  flex: 1; border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; font: inherit; background: #fff;
}
.composer input:focus { outline: 2px solid #fecdd3; border-color: var(--accent); }
.composer button {
  border: none; background: var(--accent); color: #fff; border-radius: 10px;
  padding: 10px 16px; cursor: pointer; font: inherit; font-weight: 600;
}