/* ─── Reset & Base ─────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:    #3b82f6;
  --blue-dk: #1d4ed8;
  --red:     #ef4444;
  --green:   #22c55e;
  --amber:   #f59e0b;
  --slate-50:  #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;

  --sidebar-w: 300px;
  --header-h:  52px;
  --radius:    8px;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
}

html, body {
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
  color: var(--slate-800);
  background: var(--slate-100);
  line-height: 1.5;
}

/* ─── Loading Overlay ──────────────────────────────────────────────────────── */

.loading-overlay {
  position: fixed; inset: 0;
  background: var(--slate-50);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
  transition: opacity .3s;
}
.loading-overlay.hidden { opacity: 0; pointer-events: none; }

.loading-card {
  text-align: center;
  padding: 40px 48px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,.10);
  max-width: 420px; width: 90%;
}
.loading-logo   { margin-bottom: 16px; }
.loading-title  { font-size: 1.5rem; font-weight: 700; color: var(--slate-900); }
.loading-subtitle { color: var(--slate-500); margin: 4px 0 24px; }

.loading-bar-track {
  width: 100%; height: 6px;
  background: var(--slate-200);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: 12px;
}
.loading-bar {
  height: 100%;
  width: 0;
  background: var(--blue);
  border-radius: 9999px;
  transition: width .2s ease;
}
.loading-msg   { color: var(--slate-500); font-size: .875rem; }
.loading-error {
  margin-top: 16px;
  padding: 12px;
  background: #fef2f2;
  border: 1px solid #fca5a5;
  border-radius: var(--radius);
  color: #b91c1c;
  font-size: .8rem;
  white-space: pre-wrap;
  text-align: left;
}
.hidden { display: none !important; }

/* ─── App Shell ────────────────────────────────────────────────────────────── */

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

/* ─── Header ───────────────────────────────────────────────────────────────── */

.app-header {
  height: var(--header-h);
  background: #fff;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
  box-shadow: var(--shadow);
  z-index: 10;
}

.header-brand {
  display: flex; align-items: center; gap: 10px;
}
.header-title {
  font-size: 1rem; font-weight: 700; color: var(--slate-900);
  letter-spacing: -.01em;
}

.header-meta {
  display: flex; align-items: center; gap: 12px;
}
.meta-badge {
  padding: 2px 10px;
  background: var(--slate-100);
  border: 1px solid var(--slate-200);
  border-radius: 9999px;
  font-size: .75rem;
  color: var(--slate-600, var(--slate-500));
  font-variant-numeric: tabular-nums;
}
.model-select-wrapper {
  display: flex; align-items: center; gap: 6px;
}
.model-select-label {
  font-size: .75rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .05em;
  color: var(--slate-400);
}
.model-select {
  padding: 4px 28px 4px 10px;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius);
  background: var(--slate-50);
  font-size: .8rem;
  font-weight: 500;
  color: var(--slate-700);
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: border-color .15s;
}
.model-select:hover  { border-color: var(--blue); }
.model-select:focus  { border-color: var(--blue); box-shadow: 0 0 0 3px #3b82f620; }

.meta-status {
  display: flex; align-items: center; gap: 6px;
  font-size: .8rem; color: var(--slate-500);
}
.model-path {
  font-size: .7rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-400);
  background: var(--slate-100);
  border: 1px solid var(--slate-200);
  border-radius: 4px;
  padding: 1px 6px;
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--amber);
  transition: background .4s;
}
.status-dot.ready { background: var(--green); }
.status-dot.error { background: var(--red); }

/* ─── Body Layout ──────────────────────────────────────────────────────────── */

.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ─── Sidebar ──────────────────────────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: #fff;
  border-right: 1px solid var(--slate-200);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.search-section {
  padding: 20px 16px;
  border-bottom: 1px solid var(--slate-200);
}
.search-label {
  display: block;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--slate-400);
  margin-bottom: 6px;
}
.query-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius);
  font-size: 1.05rem;
  font-family: "JetBrains Mono", "Fira Mono", "Consolas", monospace;
  color: var(--slate-800);
  background: var(--slate-50);
  outline: none;
  transition: border-color .15s;
}
.query-input:focus {
  border-color: var(--blue);
  background: #fff;
  box-shadow: 0 0 0 3px #3b82f620;
}
.syntax-hint {
  margin-top: 6px;
  font-size: .72rem;
  color: var(--slate-400);
  line-height: 1.6;
}
.syntax-hint code {
  background: var(--slate-100);
  border-radius: 3px;
  padding: 1px 4px;
  font-size: .72rem;
  color: var(--slate-600, var(--slate-500));
}

/* Examples */
.examples-section {
  padding: 12px 16px;
  border-bottom: 1px solid var(--slate-200);
}
.examples-label {
  font-size: .7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--slate-400);
  margin-bottom: 8px;
}
.example-chips {
  display: flex; flex-wrap: wrap; gap: 5px;
}
.example-chip {
  padding: 3px 9px;
  border: 1px solid var(--slate-200);
  border-radius: 9999px;
  background: var(--slate-50);
  font-size: .72rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-600, var(--slate-500));
  cursor: pointer;
  transition: all .15s;
}
.example-chip:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: #eff6ff;
}

/* ─── Similarity Calculator ─────────────────────────────────────────────────── */

.sim-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--slate-200);
}
.sim-label {
  font-size: .7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--slate-400);
  margin-bottom: 8px;
}
.sim-inputs {
  display: flex; align-items: center; gap: 6px; margin-bottom: 8px;
}
.sim-input {
  flex: 1; min-width: 0;
  padding: 7px 10px;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius);
  font-size: .85rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-800);
  background: var(--slate-50);
  outline: none;
  transition: border-color .15s;
}
.sim-input:focus { border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px #3b82f620; }
.sim-vs {
  font-size: .72rem; font-weight: 700; color: var(--slate-400);
  flex-shrink: 0;
}
.sim-result {
  display: flex; align-items: center; gap: 8px; margin-bottom: 5px;
}
.sim-bar-track {
  flex: 1; height: 8px;
  background: var(--slate-200); border-radius: 9999px; overflow: hidden;
}
.sim-bar {
  height: 100%; width: 0%; border-radius: 9999px;
  transition: width .25s ease, background-color .25s;
  background: var(--slate-300);
}
.sim-bar.high { background: var(--green); }
.sim-bar.mid  { background: var(--blue); }
.sim-bar.low  { background: var(--amber); }
.sim-score {
  font-size: .85rem; font-weight: 700;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-700);
  min-width: 42px; text-align: right;
}
.sim-hint {
  font-size: .72rem; color: var(--slate-400);
}

/* ─── Query History ─────────────────────────────────────────────────────────── */

.history-section {
  flex: 1; min-height: 0; overflow: hidden;
  padding: 12px 16px;
  display: flex; flex-direction: column;
}
.history-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.history-label {
  font-size: .7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--slate-400);
}
.history-clear {
  background: none; border: none;
  font-size: .72rem; color: var(--slate-400);
  cursor: pointer; padding: 2px 4px; border-radius: 4px;
  transition: color .15s, background .15s;
}
.history-clear:hover { color: var(--red); background: #fee2e2; }
.history-list {
  list-style: none;
  display: flex; flex-direction: column; gap: 3px;
  flex: 1; overflow-y: auto;
}
.history-item {
  padding: 5px 10px;
  border-radius: 6px;
  font-size: .8rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-600, var(--slate-500));
  cursor: pointer;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: background .12s, color .12s;
  border: 1px solid transparent;
}
.history-item:hover {
  background: #eff6ff; color: var(--blue);
  border-color: #bfdbfe;
}

/* ─── Main Panel ───────────────────────────────────────────────────────────── */

.main-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ─── Tab Bar ──────────────────────────────────────────────────────────────── */

.tab-bar {
  display: flex;
  gap: 2px;
  padding: 8px 16px 0;
  background: var(--slate-100);
  border-bottom: 1px solid var(--slate-200);
  flex-shrink: 0;
}
.tab-btn {
  padding: 7px 16px;
  border: none;
  border-radius: var(--radius) var(--radius) 0 0;
  background: transparent;
  font-size: .8rem;
  font-weight: 500;
  color: var(--slate-500);
  cursor: pointer;
  transition: all .15s;
  border-bottom: 2px solid transparent;
}
.tab-btn:hover { color: var(--slate-800); background: var(--slate-200); }
.tab-btn.active {
  color: var(--blue);
  background: #fff;
  border-bottom-color: var(--blue);
}

/* ─── Tab Content ──────────────────────────────────────────────────────────── */

.tab-content {
  flex: 1;
  overflow: hidden;
  background: #fff;
}
.tab-pane {
  display: none;
  height: 100%;
  overflow-y: auto;
  padding: 20px;
}
.tab-pane.active { display: block; }

.empty-hint {
  color: var(--slate-400);
  font-size: .875rem;
  padding: 32px 0;
  text-align: center;
}

/* ─── Neighbors List ───────────────────────────────────────────────────────── */

.neighbors-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 8px;
}
.neighbors-expr {
  font-family: "JetBrains Mono", monospace;
  font-size: .85rem;
  font-weight: 600;
  color: var(--slate-800);
}
.neighbors-mode {
  padding: 2px 9px;
  border-radius: 9999px;
  font-size: .7rem;
  font-weight: 600;
}
.neighbors-mode.nearest  { background: #dbeafe; color: #1e40af; }
.neighbors-mode.farthest { background: #fef3c7; color: #92400e; }

.unknown-words {
  margin-bottom: 10px;
  padding: 6px 10px;
  background: #fef9c3;
  border: 1px solid #fde68a;
  border-radius: 6px;
  font-size: .78rem;
  color: #713f12;
}
.unknown-words code {
  background: #fde047;
  border-radius: 3px;
  padding: 1px 4px;
}

.neighbor-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.neighbor-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border: 1px solid var(--slate-200);
  border-radius: 6px;
  cursor: pointer;
  transition: all .12s;
  gap: 8px;
}
.neighbor-item:hover {
  border-color: var(--blue);
  background: #eff6ff;
}
.neighbor-word {
  font-weight: 600;
  font-size: .85rem;
  color: var(--slate-800);
  min-width: 80px;
}
.neighbor-score-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: flex-end;
}
.neighbor-bar {
  display: inline-block;
  height: 8px;
  border-radius: 4px;
  min-width: 2px;
  max-width: 80px;
}
.neighbor-bar.pos { background: var(--blue); }
.neighbor-bar.neg { background: var(--red); }
.neighbor-score {
  font-size: .75rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-500);
  min-width: 48px;
  text-align: right;
}

/* ─── Neighbors multi-column ──────────────────────────────────────────────── */

.neighbors-columns {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.neighbors-column {
  flex: 1;
  min-width: 240px;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--slate-50);
}
.neighbors-divider {
  height: 1px;
  background: var(--slate-200);
  margin: 8px 0;
}

/* ─── Steps Timeline ───────────────────────────────────────────────────────── */

.steps-group-label {
  font-size: .8rem;
  font-weight: 700;
  font-family: "JetBrains Mono", monospace;
  color: var(--slate-500);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin: 16px 0 8px;
  padding-left: 2px;
  border-left: 3px solid var(--blue);
  padding-left: 8px;
}
.steps-timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin-bottom: 24px;
}
.step-card {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow);
}
.step-card.result-card {
  border-color: var(--amber);
  box-shadow: 0 0 0 2px #fef3c7;
}
.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--slate-50);
  border-bottom: 1px solid var(--slate-200);
}
.step-label {
  font-family: "JetBrains Mono", monospace;
  font-size: .85rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 9999px;
}
.step-label.first  { background: #dbeafe; color: #1e40af; }
.step-label.plus   { background: #dcfce7; color: #14532d; }
.step-label.minus  { background: #fee2e2; color: #7f1d1d; }
.step-label.result { background: #fef3c7; color: #78350f; }

.step-changed {
  font-size: .72rem;
  color: var(--slate-400);
  font-family: "JetBrains Mono", monospace;
}

.step-canvas {
  width: 100% !important;
  height: 100px !important;
  display: block;
  padding: 8px 14px 4px;
}
.step-sublabel {
  padding: 4px 14px 8px;
  font-size: .72rem;
  color: var(--slate-400);
}

/* ─── Vectors Tab ──────────────────────────────────────────────────────────── */

#tab-vectors canvas {
  width: 100% !important;
  height: calc(100vh - var(--header-h) - 80px) !important;
  max-height: 600px;
}

/* ─── Scatter Tab ──────────────────────────────────────────────────────────── */

#tab-scatter canvas {
  width: 100% !important;
  height: calc(100vh - var(--header-h) - 80px) !important;
  max-height: 600px;
}

/* ─── Heatmap Tab ──────────────────────────────────────────────────────────── */

.heatmap-outer {
  display: flex;
  align-items: flex-start;
  overflow-x: auto;
}
.heatmap-labels {
  flex-shrink: 0;
  position: sticky;
  left: 0;
  z-index: 2;
  background: #fff;
  border-right: 2px solid var(--slate-200);
}
.heatmap-row-label {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-size: 11px;
  color: var(--slate-500);
  padding: 0 8px 0 4px;
  white-space: nowrap;
  font-family: system-ui, sans-serif;
  box-sizing: border-box;
}
.heatmap-row-label--main {
  font-weight: 700;
  color: var(--slate-800);
  background: #eff6ff;
  border-left: 3px solid var(--blue);
}
.heatmap-scroll {
  overflow-x: visible;
  flex-shrink: 0;
}
.heatmap-scroll canvas { display: block; }
.heatmap-info {
  font-size: .75rem;
  color: var(--slate-400);
  margin-top: 8px;
}

/* ─── Scrollbar ────────────────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--slate-300); border-radius: 9999px; }
::-webkit-scrollbar-thumb:hover { background: var(--slate-400); }