:root {
  --bg: #efe7d8;
  --ink: #221c16;
  --muted: #6f655b;
  --line: #e0d3bf;
  --paper: #fffaf2;
  --paper-2: #f6efe3;
  --green: #1d684f;
  --green-deep: #144a38;
  --green-soft: #e4f3ec;
  --cinnabar: #b84324;
  --gold: #8d6232;
  --shadow: 0 16px 40px rgba(68, 42, 16, 0.08);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Times New Roman", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Avenir Next", "Segoe UI", sans-serif;
  --radius: 18px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(900px 420px at -10% -10%, rgba(196, 112, 52, 0.18), transparent 55%),
    radial-gradient(800px 380px at 110% -20%, rgba(29, 104, 79, 0.16), transparent 50%),
    linear-gradient(180deg, #f4eee4 0%, #e9e1d2 100%);
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, p { margin: 0; }
::selection { background: #d5eee3; }

.app {
  width: min(1240px, calc(100% - 28px));
  height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding-top: 18px;
}

.top {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 18px 28px;
  align-items: end;
  padding: 4px 6px 16px;
}
.brand { display: flex; gap: 12px; align-items: center; }
.mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--green-deep);
  color: #f6f0e4;
  font-family: var(--serif);
  font-size: 24px;
}
.kicker {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}
h1 {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
}
.lede {
  max-width: 460px;
  color: var(--muted);
  line-height: 1.55;
  padding-bottom: 4px;
}
.pills { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
.pill {
  border: 1px solid var(--line);
  background: rgba(255, 250, 242, 0.8);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--muted);
}
.pill strong { color: var(--ink); font-weight: 600; }
.pill.is-ok { color: var(--green-deep); border-color: #b7d7c8; background: var(--green-soft); }
.pill.is-wait { color: var(--gold); }
.pill.is-bad { color: var(--cinnabar); border-color: #f0c2b6; background: #fff1ec; }

.workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 332px;
  gap: 16px;
  padding-bottom: 16px;
}
.chat, .library {
  min-height: 0;
  background: rgba(255, 250, 242, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}
.chat { display: flex; flex-direction: column; overflow: hidden; }
.messages {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty {
  margin: auto;
  max-width: 640px;
  text-align: center;
  padding: 24px 8px 12px;
}
.empty h2 {
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.03em;
}
.empty p { margin-top: 10px; color: var(--muted); line-height: 1.7; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 18px; }
.chip, .textish, .ghost, .send, .cite, .icon-btn {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 999px;
}
.chip {
  padding: 8px 12px;
  color: var(--green-deep);
}
.chip:hover, .icon-btn:hover, .textish:hover, .ghost:hover { border-color: #b7d7c8; background: var(--green-soft); }
.chip:disabled, .send:disabled, .ghost:disabled, .textish:disabled, textarea:disabled, input:disabled, select:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.turn {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 16px;
  overflow: hidden;
}
.question {
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(184, 67, 36, 0.08), transparent 28%),
    var(--paper-2);
}
.question p {
  margin-top: 4px;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.45;
}
.label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}
.answer-row {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(250px, 0.85fr);
}
.answer, .slices { padding: 14px 16px 16px; min-width: 0; }
.slices {
  background: #fbf6ee;
  border-left: 1px solid var(--line);
  max-height: 560px;
  overflow: auto;
}
.answer-body {
  margin-top: 8px;
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.8;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.answer-foot, .quiet, .hint, .slice-meta, .doc-preview, .warn {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}
.answer-foot { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 12px; }
.tag {
  border-radius: 999px;
  padding: 2px 8px;
  background: var(--green-soft);
  color: var(--green-deep);
}
.tag.is-extract { background: #f8ead7; color: var(--gold); }
.warn {
  margin: 8px 0 0;
  color: var(--cinnabar);
}
.cite {
  display: inline-flex;
  align-items: center;
  margin: 0 2px;
  padding: 0 6px;
  height: 22px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--green-deep);
  border-color: #b7d7c8;
  font-family: var(--sans);
  font-size: 12px;
  vertical-align: 1px;
}
.cite:hover, .cite.is-on { background: var(--green); color: white; border-color: var(--green); }

.slices-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
  margin-bottom: 10px;
}
.slices-head h3 { font-size: 14px; font-weight: 600; }
.slice-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.slice {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 12px;
  padding: 10px 10px 11px;
}
.slice.is-active { border-color: var(--green); box-shadow: inset 3px 0 0 var(--green); }
.slice-top { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.slice-no {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--cinnabar);
  font-weight: 650;
}
.bar {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: #efe4d4;
  overflow: hidden;
}
.bar span { display: block; height: 100%; background: var(--cinnabar); border-radius: inherit; }
.slice-title { margin-top: 6px; font-size: 13px; font-weight: 600; }
.slice-text {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.pending {
  height: 12px;
  margin-top: 12px;
  border-radius: 999px;
  background: linear-gradient(90deg, #f3eadc, #e7f3ec, #f3eadc);
  background-size: 200% 100%;
  animation: sheen 1.1s linear infinite;
}
.pending.short { width: 46%; }
@keyframes sheen { to { background-position: -200% 0; } }

.composer { border-top: 1px solid var(--line); padding: 12px; background: rgba(255, 250, 242, 0.92); }
textarea, input[type="text"], input:not([type="file"]), select {
  width: 100%;
  border: 1px solid var(--line);
  background: white;
  border-radius: 12px;
  padding: 10px 12px;
  outline: none;
}
textarea { resize: vertical; line-height: 1.55; }
textarea:focus, input:focus, select:focus { border-color: #8fbfa8; }
.composer textarea { min-height: 64px; }
.composer-bar, .doc-actions { display: flex; align-items: center; gap: 10px; }
.composer-bar { margin-top: 8px; }
.hint { margin-right: auto; }
.topk { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.topk select { width: auto; padding: 6px 8px; border-radius: 10px; }
.send, .ghost {
  border-radius: 12px;
  padding: 9px 16px;
  background: var(--green);
  color: white;
  border-color: var(--green-deep);
}
.ghost { background: transparent; color: var(--green-deep); }
.textish { background: transparent; padding: 8px 10px; }

.library { display: flex; flex-direction: column; overflow: hidden; }
.library-head, .doc-form { padding: 14px 14px 0; }
.library-head h2 { font-family: var(--serif); font-size: 22px; font-weight: 600; margin-top: 2px; }
.library-head .quiet { margin-top: 8px; }
.facts { display: grid; grid-template-columns: 72px 1fr; gap: 4px 8px; margin: 12px 0 0; font-size: 12px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }
.doc-form { display: flex; flex-direction: column; gap: 8px; padding-top: 12px; }
.doc-form label, .sr { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}
.doc-actions { margin: 2px 0 12px; }
.doc-list { flex: 1; overflow: auto; padding: 0 10px 12px; display: flex; flex-direction: column; gap: 8px; }
.doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 8px;
  padding: 10px;
  border-radius: 12px;
  background: var(--paper-2);
}
.doc-title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-preview { grid-column: 1 / -1; }
.icon-btn {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  color: var(--cinnabar);
}
.empty-docs { padding: 8px 6px 12px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%) translateY(12px);
  background: var(--ink);
  color: #f6f0e4;
  padding: 10px 14px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  max-width: min(520px, calc(100% - 32px));
}
.toast.is-on { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 980px) {
  .app { height: auto; min-height: 100vh; }
  .top, .workspace, .answer-row { grid-template-columns: 1fr; }
  .pills { justify-content: flex-start; }
  .workspace { display: flex; flex-direction: column; }
  .chat { min-height: 70vh; }
  .library { min-height: 520px; }
  .slices { border-left: 0; border-top: 1px solid var(--line); max-height: none; }
}
@media (prefers-reduced-motion: reduce) {
  .pending { animation: none; }
  .toast { transition: none; }
}