/* Head Neuroanatomy 3D — dark theme matching the other demos */

:root {
  --bg: #0b0f17;
  --bg-2: #0f1624;
  --bg-3: #141b2e;
  --text: #e6edf3;
  --muted: #9fb0c3;
  --accent: #7ae1ff;
  --accent-2: #ffb86b;
  --danger: #ff6b6b;
  --success: #51cf66;
  --panel: rgba(15, 22, 36, 0.95);
  --border: rgba(122, 225, 255, 0.3);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: radial-gradient(1200px 800px at 20% 10%, #0e1522 0%, var(--bg) 50%, #060a11 100%);
  color: var(--text);
  overflow: hidden;
}

#canvas-container {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  position: relative;
  cursor: grab;
  touch-action: none;
}

#canvas-container:active { cursor: grabbing; }

.back-link {
  position: absolute;
  top: calc(16px + var(--safe-top));
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 16px;
  background: rgba(122, 225, 255, 0.15);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--accent);
  text-decoration: none;
  font-size: 12px;
  transition: all 0.2s;
  z-index: 40;
}

.back-link:hover { background: rgba(122, 225, 255, 0.25); }

.panel {
  position: absolute;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  backdrop-filter: blur(10px);
  font-size: 12px;
  z-index: 20;
}

.panel h2, .panel h3 {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 8px;
  border-bottom: 1px solid rgba(122, 225, 255, 0.25);
  padding-bottom: 6px;
}

.panel h3 { margin-top: 8px; font-size: 12px; }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.panel-head h2 { margin: 0; border: 0; padding: 0; }

.tree-panel {
  top: calc(72px + var(--safe-top));
  left: 16px;
  width: 300px;
  max-height: calc(100vh - 160px);
  overflow: auto;
}

.tools-panel {
  top: calc(72px + var(--safe-top));
  right: 16px;
  width: 300px;
  max-height: calc(100vh - 160px);
  overflow: auto;
}

.info-card {
  right: 328px;
  bottom: 16px;
  width: 300px;
  max-height: 46vh;
  overflow: auto;
  display: none;
}
.info-card.visible { display: block; }
.info-close { position: absolute; top: 6px; right: 6px; padding: 2px 8px; }

.top-bar {
  position: absolute;
  top: calc(52px + var(--safe-top));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 25;
  width: min(720px, calc(100vw - 340px));
  pointer-events: none;
}

.top-bar > * { pointer-events: auto; }

.view-toggles { display: flex; gap: 6px; }
.view-buttons, .button-group, .layer-chips, .slice-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.view-buttons button, button {
  padding: 8px 10px;
  background: linear-gradient(135deg, rgba(122, 225, 255, 0.2), rgba(122, 225, 255, 0.1));
  border: 1px solid rgba(122, 225, 255, 0.4);
  border-radius: 6px;
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  transition: all 0.2s;
}

button:hover {
  background: linear-gradient(135deg, rgba(122, 225, 255, 0.35), rgba(122, 225, 255, 0.2));
  transform: translateY(-1px);
}

button.active, .preset-btn.active, .chip:not(.off) {
  box-shadow: inset 0 0 0 1px rgba(81, 207, 102, 0.6);
}

.view-buttons button { min-width: 36px; }

.button-group.compact button { flex: 1; padding: 7px 6px; font-size: 11px; }

.layer-chips { justify-content: center; }
.chip {
  font-size: 10px;
  padding: 5px 8px;
}
.chip.off { opacity: 0.4; filter: grayscale(0.4); }

.control-group { margin: 10px 0; }
.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
  font-size: 11px;
}
.control-value {
  color: var(--accent);
  font-weight: 700;
  font-family: 'Courier New', monospace;
}

input[type="range"] {
  width: 100%;
  height: 5px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--bg-3), var(--accent));
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(122, 225, 255, 0.5);
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.slider-hint, .muted { color: var(--muted); font-size: 10px; line-height: 1.4; }

.section-divider {
  height: 1px;
  background: rgba(122, 225, 255, 0.2);
  margin: 12px 0;
}

.structure-tree { margin-top: 8px; }
.tree-group { margin-bottom: 8px; }
.tree-group-header {
  width: 100%;
  text-align: left;
  display: flex;
  gap: 6px;
  font-size: 11px;
}
.tree-group-body.collapsed, .tree-children.collapsed { display: none; }
.tree-node { margin-left: 4px; }
.tree-row {
  display: grid;
  grid-template-columns: 16px 16px 12px 1fr auto;
  gap: 6px;
  align-items: center;
  padding: 3px 2px;
  border-radius: 4px;
}
.tree-row.selected, .tree-node.solo > .tree-row {
  background: rgba(122, 225, 255, 0.12);
}
.tree-row.folder .tree-name { font-weight: 700; }
.twisty {
  padding: 0;
  min-width: 16px;
  background: none;
  border: 0;
  color: var(--muted);
}
.twisty:disabled { opacity: 0; }
.swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  border: 1px solid rgba(255,255,255,0.25);
}
.tree-name {
  background: none;
  border: 0;
  color: var(--text);
  text-align: left;
  padding: 0;
  font-size: 11px;
  font-weight: 500;
  transform: none;
}
.tree-name:hover { color: var(--accent); }
.tree-actions { display: flex; gap: 2px; }
.tiny {
  padding: 2px 5px;
  font-size: 9px;
  min-width: 0;
}
.tree-extra { padding: 2px 6px 8px 40px; }
.tree-extra label { font-size: 10px; color: var(--muted); }
.tree-children { margin-left: 12px; }

.clip-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  font-size: 11px;
}
.flip { font-size: 10px; color: var(--muted); display: block; margin: 4px 0 8px; }

.slice-presets button, .preset-btn {
  font-size: 10px;
  padding: 6px 8px;
  text-align: left;
}
.preset-list { display: flex; flex-direction: column; gap: 6px; }
.preset-btn {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.preset-btn span { font-weight: 400; color: var(--muted); font-size: 10px; }

.tx-legend { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0; }
.tx-badge {
  font-size: 9px;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
}
.tx-ACh { color: #06d6a0; }
.tx-NE { color: #3a86ff; }
.tx-5-HT { color: #c77dff; }
.tx-histamine { color: #ffb703; }
.tx-DA { color: #ff5400; }

.info-kicker { font-size: 10px; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; }
.info-card h2 { border: 0; padding: 4px 0 8px; font-size: 16px; color: var(--text); }
.fn, .clinical { line-height: 1.45; margin-bottom: 8px; }
.clinical { color: var(--accent-2); }
.meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 8px 0;
  font-size: 11px;
}
.meta-grid span { display: block; color: var(--muted); font-size: 10px; }
.conn-label { font-size: 10px; color: var(--muted); margin-top: 6px; }
.conn-row { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.conn-chip { font-size: 10px; padding: 4px 7px; }
.licence-line, .chapter-link { font-size: 10px; color: var(--muted); margin-top: 8px; }
.cn-box {
  background: rgba(255, 184, 107, 0.1);
  border-left: 3px solid var(--accent-2);
  padding: 6px 8px;
  margin: 6px 0;
  border-radius: 4px;
}
.badge-schematic {
  font-size: 9px;
  color: var(--accent-2);
  border: 1px solid rgba(255, 184, 107, 0.4);
  border-radius: 999px;
  padding: 1px 6px;
  margin-left: 4px;
}

.hud-bottom {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 16px;
  z-index: 15;
  pointer-events: none;
}
.hud-row {
  display: flex;
  gap: 16px;
  align-items: flex-end;
  margin-bottom: 6px;
}
.mni-readout, .scale-bar, .click-hint, .asset-banner {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 11px;
  pointer-events: none;
}
.mni-readout { font-family: 'Courier New', monospace; }
.mni-empty, .mni-src { color: var(--muted); }
.scale-bar { display: flex; align-items: center; gap: 8px; }
.scale-bar-fill {
  height: 4px;
  width: 40px;
  background: #fff;
  box-shadow: 0 0 8px rgba(255,255,255,0.4);
}
.asset-banner {
  display: inline-block;
  margin-bottom: 6px;
  color: var(--accent-2);
  max-width: 640px;
}
.click-hint { display: inline-block; color: var(--muted); }

#hover-tooltip {
  position: fixed;
  z-index: 50;
  background: rgba(15, 22, 36, 0.96);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 11px;
  pointer-events: none;
}

#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 10, 17, 0.92);
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.35s;
}
#loading-overlay.done { opacity: 0; pointer-events: none; }
.loading-card {
  width: min(420px, 90vw);
  text-align: center;
}
.loading-kicker {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.loading-card h1 { font-size: 26px; margin-bottom: 8px; }
.loading-card p { color: var(--muted); font-size: 12px; margin-bottom: 16px; }
.progress-track {
  height: 6px;
  background: var(--bg-3);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 10px;
}
#progress-bar {
  height: 100%;
  width: 4%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  transition: width 0.2s;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal[hidden] { display: none !important; }
.modal-card {
  width: min(560px, 100%);
  max-height: 80vh;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}
.disclaimer {
  background: rgba(255, 184, 107, 0.1);
  border-left: 3px solid var(--accent-2);
  padding: 8px;
  margin-bottom: 12px;
  font-size: 12px;
  line-height: 1.45;
}
.credit-list { list-style: none; }
.credit-list li { margin: 10px 0; }
.credit-list .lic { color: var(--accent); font-size: 11px; margin-left: 8px; }
.icon-btn {
  background: none;
  border: 0;
  color: var(--muted);
  padding: 4px 8px;
}
.credits-btn {
  width: 100%;
  border-color: rgba(255, 184, 107, 0.55);
  background: linear-gradient(135deg, rgba(255, 184, 107, 0.28), rgba(255, 184, 107, 0.1));
  color: var(--accent-2);
}
.stats { font-size: 10px; color: var(--muted); margin-top: 10px; }
.stats div { margin: 3px 0; }

.mobile-dock, .mobile-only { display: none; }

@media (max-width: 1100px) {
  .top-bar { width: calc(100vw - 32px); top: calc(56px + var(--safe-top)); }
  .tree-panel, .tools-panel {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: min(70vh, 520px);
    border-radius: 16px 16px 0 0;
    transform: translateY(110%);
    transition: transform 0.25s ease;
  }
  .tree-panel.open, .tools-panel.open { transform: translateY(0); }
  .info-card {
    left: 10px;
    right: 10px;
    width: auto;
    bottom: 92px;
    max-height: 28vh;
  }
  .mobile-dock, .mobile-only { display: flex; }
  .mobile-dock {
    position: absolute;
    right: 12px;
    bottom: calc(16px + var(--safe-bottom));
    gap: 8px;
    z-index: 30;
  }
  .click-hint { display: none; }
  .hud-bottom { left: 10px; right: 10px; bottom: calc(64px + var(--safe-bottom)); }
  .back-link { font-size: 11px; padding: 6px 10px; }
}

@media (max-width: 640px) {
  .view-buttons button { min-width: 30px; padding: 6px 7px; font-size: 11px; }
  .layer-chips { max-width: 100%; overflow-x: auto; flex-wrap: nowrap; }
  .layer-chips::-webkit-scrollbar { display: none; }
  .info-card { font-size: 11px; }
}

/* ---- lighter UI additions ---- */
.tree-opts { display: flex; flex-direction: column; gap: 6px; margin: 8px 0 4px; }
.inline-opt { display: flex; align-items: center; gap: 6px; font-size: 11px; color: var(--muted); }
.ghost-opt { flex-wrap: wrap; }
.ghost-opt input[type="range"] { flex: 1 1 100%; }
.view-toggles .chip { font-size: 10px; padding: 5px 9px; }

/* opacity slider only for the selected tree row */
.tree-extra { display: none; }
.tree-row.selected + .tree-extra { display: block; }

.tool-section { border-top: 1px solid rgba(122, 225, 255, 0.18); padding: 6px 0; }
.tool-section:first-of-type { border-top: 0; }
.tool-section > summary {
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 0;
  list-style: none;
}
.tool-section > summary::-webkit-details-marker { display: none; }
.tool-section > summary::before { content: '▸'; display: inline-block; width: 14px; color: var(--muted); }
.tool-section[open] > summary::before { content: '▾'; }
.tools-foot { margin-top: 8px; }

@media (max-width: 1100px) {
  .info-card { right: 10px; left: 10px; width: auto; bottom: 92px; max-height: 30vh; }
}