:root {
  --bg-0: #0d1117;
  --bg-1: #161b22;
  --bg-2: #1c222b;
  --bg-3: #21272f;
  --border: #30363d;
  --border-strong: #4a5260;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #d4a574;
  --accent-strong: #e8b783;
  --user: #6ea8fe;
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  height: 100%;
}

body.app {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

body.drag-active::after {
  content: "Drop files to ingest";
  position: fixed;
  inset: 0;
  background: rgba(13, 17, 23, 0.85);
  color: var(--accent);
  font-size: 22px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  pointer-events: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 22px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.brand { display: flex; align-items: baseline; gap: 12px; }
.brand-mark {
  width: 14px; height: 14px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), #b07840);
  display: inline-block;
  align-self: center;
}
.topbar h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.2px;
}
.tagline { color: var(--text-muted); font-size: 12px; }

.topbar-meta { display: flex; align-items: center; gap: 12px; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  display: inline-block;
}
.status-dot.idle { background: var(--text-muted); }
.status-dot.busy { background: var(--warn); animation: pulse 1.2s infinite; }
.status-dot.ready { background: var(--ok); }
.status-dot.err { background: var(--err); }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.45; } }
.status-text { font-size: 12px; color: var(--text-muted); }
.version {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-muted);
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.three-pane {
  display: grid;
  grid-template-columns: 320px 1fr 360px;
  gap: 0;
  flex: 1 1 auto;
  min-height: 0;
}

.pane {
  border-right: 1px solid var(--border);
  background: var(--bg-0);
  overflow-y: auto;
  padding: 14px;
}
.pane:last-child { border-right: none; }
.center-pane {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.panel {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 12px;
}
.panel h2 {
  margin: 0 0 10px 0;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
}

.row-buttons { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }

button {
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
}
button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.primary {
  background: var(--accent);
  color: var(--bg-0);
  border-color: var(--accent);
}
button.primary:hover:not(:disabled) {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
button.danger {
  background: transparent;
  color: var(--err);
  border-color: var(--err);
}
button.icon-btn {
  padding: 2px 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
}
button.icon-btn:hover { color: var(--err); }

input, textarea, select {
  background: var(--bg-0);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 4px;
  font-family: inherit;
  font-size: 13px;
  width: 100%;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

.stat-table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 12px; }
.stat-table td { padding: 4px 8px; border-bottom: 1px solid var(--border); }
.stat-table td:first-child { color: var(--text-muted); width: 100px; }
.stat-table tr:last-child td { border-bottom: none; }

.progress-line { font-family: var(--mono); font-size: 11px; color: var(--text-muted); }

.doc-list { display: flex; flex-direction: column; gap: 4px; }
.doc-row { display: flex; align-items: center; gap: 8px; padding: 5px 8px; background: var(--bg-2); border-radius: 4px; }
.doc-title { flex: 1 1 auto; font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-meta { font-family: var(--mono); font-size: 10px; color: var(--text-muted); }
.muted { color: var(--text-muted); font-size: 12px; }

.toolbar {
  display: flex;
  gap: 14px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-1);
  flex-wrap: wrap;
}
.toolbar .check, .toolbar .num { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-muted); }
.toolbar input[type="number"] { width: 56px; padding: 3px 6px; }

.conversation {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.msg { display: grid; grid-template-columns: 70px 1fr; gap: 12px; }
.msg-role {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  padding-top: 4px;
}
.msg.user .msg-role { color: var(--user); }
.msg.assistant .msg-role { color: var(--accent); }
.msg.system .msg-role { color: var(--text-muted); }
.msg.trace .msg-role { color: var(--warn); }
.msg-body {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  white-space: pre-wrap;
}
.msg.user .msg-body { background: var(--bg-2); }
.msg.system.warn .msg-body { border-color: var(--warn); }
.msg.system.ok .msg-body { border-color: var(--ok); }

.answer-text { white-space: pre-wrap; }
.citations { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); font-size: 12px; }
.cite-label { color: var(--text-muted); margin-right: 4px; }
.cite { display: inline-block; padding: 2px 8px; margin: 2px 4px 2px 0; background: var(--bg-2); border: 1px solid var(--border); border-radius: 3px; font-family: var(--mono); font-size: 11px; }
.fallback-note { margin-top: 6px; font-size: 11px; color: var(--warn); font-style: italic; }
.msg-footer { margin-top: 6px; font-family: var(--mono); font-size: 10px; color: var(--text-muted); text-align: right; }

.trace-item { padding: 6px 0; border-bottom: 1px dashed var(--border); }
.trace-item:last-child { border-bottom: none; }
.trace-head { font-family: var(--mono); font-size: 11px; color: var(--accent); }
.trace-reason { font-size: 12px; margin: 2px 0; }
.trace-candidates { font-family: var(--mono); font-size: 10px; color: var(--text-muted); }

.composer {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-1);
}
.composer textarea { flex: 1 1 auto; resize: vertical; }
.composer button { flex: 0 0 auto; align-self: flex-end; padding: 8px 18px; }

.tree-view { font-family: var(--mono); font-size: 11px; }
.tnode { margin-left: 8px; }
.tnode-header { display: flex; align-items: center; gap: 6px; padding: 2px 4px; cursor: pointer; border-radius: 3px; }
.tnode-header:hover { background: var(--bg-2); }
.tnode.highlighted > .tnode-header { background: var(--bg-3); border: 1px solid var(--accent); }
.toggle, .tnode-dot { width: 12px; color: var(--text-muted); font-size: 9px; }
.tnode-title { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tnode-page { font-size: 10px; color: var(--text-muted); }
.tnode.level-document > .tnode-header > .tnode-title { color: var(--accent); font-weight: 600; }
.tnode.level-section > .tnode-header > .tnode-title { color: var(--text); }
.tnode.level-leaf > .tnode-header > .tnode-title { color: var(--text-muted); font-size: 10px; }
.tnode-children { margin-left: 8px; border-left: 1px solid var(--border); padding-left: 4px; }

.dialog {
  background: var(--bg-1);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 22px;
  max-width: 560px;
  width: 92%;
}
.dialog::backdrop { background: rgba(0,0,0,0.6); }
.paste-form { display: flex; flex-direction: column; gap: 8px; }
.paste-form h3 { margin: 0; color: var(--accent); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 6px; }

.hint { color: var(--text-muted); font-size: 12px; }

.eval-mode { color: var(--accent); font-family: var(--mono); font-size: 11px; margin-bottom: 6px; }
.eval-grid { display: grid; grid-template-columns: 60px 1fr; gap: 4px 10px; font-family: var(--mono); font-size: 11px; }
.eval-grid span { color: var(--text-muted); }
.eval-grid b { color: var(--text); font-weight: 500; }

.fallback-banner {
  margin: 18px 22px 0;
  padding: 14px 18px;
  background: var(--bg-1);
  border: 1px solid var(--err);
  border-radius: 8px;
}
.fallback-banner h3 { margin: 0 0 6px 0; color: var(--err); font-size: 14px; }
.fallback-banner code { background: var(--bg-2); padding: 1px 6px; border-radius: 3px; }

.tour-form { display: flex; flex-direction: column; gap: 10px; }
.tour-form h3 { margin: 0; color: var(--accent); }
.tour-steps { margin: 0; padding-left: 22px; }
.tour-steps li { margin: 4px 0; }

.prof-list { display: flex; flex-direction: column; gap: 3px; margin-bottom: 8px; }
.prof-row { display: grid; grid-template-columns: 110px 1fr 60px; gap: 6px; align-items: center; font-family: var(--mono); font-size: 10px; }
.prof-name { color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.prof-bar { height: 4px; background: var(--accent); border-radius: 2px; }
.prof-ms { text-align: right; color: var(--text); }
.prof-summary { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 10px; }
.prof-summary th, .prof-summary td { padding: 3px 6px; text-align: left; border-bottom: 1px solid var(--border); }
.prof-summary th { color: var(--text-muted); }