:root {
  --page: #eef1f5;
  --panel: #ffffff;
  --panel-soft: #f7f9fb;
  --ink: #1f2933;
  --muted: #66717f;
  --faint: #8b96a3;
  --line: #d7dde5;
  --line-strong: #aeb8c4;
  --accent: #006b5e;
  --accent-2: #275c9b;
  --warn: #9a6a00;
  --danger: #a33a34;
  --mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", Consolas, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 6px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
}

button,
textarea,
select {
  font: inherit;
}

button {
  color: inherit;
}

.app-shell {
  height: 100vh;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar {
  min-height: 76px;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 22px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 260px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: #ffffff;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 3px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  font-weight: 750;
  line-height: 1.18;
}

h1 {
  font-size: 20px;
}

h2 {
  font-size: 15px;
}

.system-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(132px, auto));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-soft);
}

.system-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 9px 14px;
  border-left: 1px solid var(--line);
}

.system-item:first-child {
  border-left: 0;
}

.system-item span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.system-item strong {
  font-family: var(--mono);
  font-size: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
}

.badge-ready {
  color: var(--accent);
}

.badge-degraded {
  color: var(--danger);
}

.badge-loading {
  color: var(--muted);
}

.workbench {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(240px, 292px) minmax(440px, 1fr) minmax(300px, 360px);
  gap: 14px;
  padding: 14px;
  overflow: hidden;
}

.corpus-panel,
.answer-panel,
.trace-panel {
  max-height: 100%;
  min-height: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.corpus-panel,
.trace-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.answer-panel {
  display: grid;
  grid-template-rows: auto minmax(320px, 1fr) auto;
  overflow: hidden;
}

.panel-head,
.stage-toolbar,
.trace-heading {
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line);
}

.metric-grid div {
  padding: 13px 16px;
  border-left: 1px solid var(--line);
}

.metric-grid div:first-child {
  border-left: 0;
}

.metric-grid span,
.empty-grid span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.metric-grid strong,
.empty-grid strong {
  display: block;
  margin-top: 3px;
  font-family: var(--mono);
  font-size: 15px;
}

.doc-list {
  flex: 1;
  min-height: 0;
  padding: 10px;
  display: grid;
  gap: 8px;
  overflow-y: auto;
  border-bottom: 1px solid var(--line);
}

.doc-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  width: 100%;
  min-height: 68px;
  padding: 10px 11px;
  text-align: left;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}

.doc-row:hover,
.doc-row.active {
  border-color: var(--accent);
  background: #f0fbf8;
}

.doc-row span,
.doc-row small {
  color: var(--muted);
  font-size: 11px;
}

.doc-row strong {
  font-size: 13px;
}

.query-bank {
  padding: 14px;
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--line);
}

.example-btn {
  width: 100%;
  min-height: 42px;
  padding: 9px 10px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent-2);
  border-radius: var(--radius);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.example-btn:hover {
  border-color: var(--accent-2);
  background: #f3f7fc;
}

.stage-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.mode-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.control-check,
.topk-control {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  color: var(--ink);
  font-size: 12px;
  font-weight: 650;
}

.control-check input {
  accent-color: var(--accent);
}

.topk-control span {
  color: var(--muted);
}

.topk-control select {
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 700;
}

.conversation {
  min-height: 0;
  overflow-y: auto;
  padding: 18px;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    #fbfcfd;
  background-size: 28px 28px;
}

.empty-state {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.empty-state h2 {
  font-size: 18px;
}

.empty-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 18px;
}

.empty-grid div {
  min-height: 72px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.turn {
  display: grid;
  gap: 7px;
  margin-bottom: 16px;
}

.turn-meta,
.assistant-label {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.user-bubble,
.assistant-bubble {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.user-bubble {
  padding: 12px 14px;
  border-left: 4px solid var(--accent-2);
  font-weight: 650;
}

.assistant-bubble {
  padding: 16px;
  border-left: 4px solid var(--accent);
  white-space: pre-wrap;
  line-height: 1.7;
}

.assistant-bubble.streaming {
  border-left-color: var(--warn);
}

.cursor-blink {
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 2px;
  background: var(--warn);
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.input-area {
  padding: 12px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

#query-input {
  width: 100%;
  min-height: 82px;
  resize: vertical;
  padding: 12px;
  background: var(--panel-soft);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  line-height: 1.5;
}

#query-input:focus {
  outline: 2px solid rgba(0, 107, 94, 0.18);
  border-color: var(--accent);
}

#query-input::placeholder {
  color: var(--faint);
}

.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
}

.char-count {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

#send-btn {
  min-height: 38px;
  min-width: 112px;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: #ffffff;
  cursor: pointer;
  font-weight: 750;
}

#send-btn:hover:not(:disabled) {
  background: #111820;
}

#send-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.trace-panel {
  overflow-y: auto;
}

.trace-block {
  border-bottom: 1px solid var(--line);
}

.trace-block:last-child {
  border-bottom: 0;
}

.trace-heading {
  padding-bottom: 11px;
}

.stats-panel,
.citation-list,
.chunks-list {
  padding: 12px;
}

.stat-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
  min-height: 34px;
  border-bottom: 1px solid var(--line);
}

.stat-row:last-child {
  border-bottom: 0;
}

.stat-row span {
  color: var(--muted);
}

.stat-row strong {
  max-width: 150px;
  overflow-wrap: anywhere;
  font-family: var(--mono);
  font-size: 12px;
  text-align: right;
}

.placeholder-text {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.citation-card {
  display: grid;
  gap: 4px;
  padding: 10px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.citation-doc {
  overflow-wrap: anywhere;
  font-weight: 750;
}

.citation-page {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.chunk-item {
  margin-bottom: 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  overflow: hidden;
}

.chunk-item summary {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 10px;
  padding: 10px;
  cursor: pointer;
  list-style: none;
}

.chunk-item summary::-webkit-details-marker {
  display: none;
}

.chunk-rank {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  grid-row: span 2;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.chunk-title {
  overflow-wrap: anywhere;
  font-weight: 750;
}

.chunk-meta {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}

.chunk-body {
  margin: 0;
  max-height: 260px;
  overflow: auto;
  padding: 11px;
  border-top: 1px solid var(--line);
  background: #f9fafb;
  color: #2f3b45;
  font-family: var(--mono);
  font-size: 11px;
  white-space: pre-wrap;
}

@media (max-width: 1180px) {
  .workbench {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .trace-panel {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .trace-block {
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .trace-block:first-child {
    border-left: 0;
  }
}

@media (max-width: 820px) {
  .app-shell {
    height: auto;
    overflow: visible;
  }

  .topbar,
  .stage-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .system-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .system-item {
    padding: 9px 10px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .system-item:first-child {
    border-left: 0;
  }

  .workbench {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .answer-panel {
    order: 1;
    grid-template-rows: auto auto auto;
  }

  .corpus-panel {
    order: 2;
  }

  .trace-panel {
    order: 3;
  }

  .conversation {
    min-height: 160px;
    padding: 10px;
  }

  .empty-state {
    padding: 12px;
  }

  .empty-state h2 {
    font-size: 15px;
  }

  .empty-grid {
    gap: 7px;
    margin-top: 10px;
  }

  .empty-grid div {
    min-height: auto;
    padding: 9px;
  }

  .input-area {
    padding: 10px;
  }

  #query-input {
    min-height: 70px;
  }

  .trace-panel {
    grid-template-columns: 1fr;
  }

  .trace-block {
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .empty-grid {
    grid-template-columns: 1fr;
  }
}