/* ============================================================
   Anatomy Explorer — design system.
   "Dark clinical / bio-tech" aesthetic — near-black viewport so
   organ meshes read clearly, electric cyan accent, crimson for
   blood-flow signal, amber for nerve signal. Deliberately distinct
   from every other site built this session (Bauhaus tarot, antique
   observatory calendar, GIS country-atlas, civic-blueprint
   us-states-atlas).
   ============================================================ */
:root {
  --bg: #0a0e14;
  --panel: #11161f;
  --panel-alt: #161c28;
  --ink: #e8ecf1;
  --ink-dim: #7c8797;
  --line: #232a38;

  --accent: #3ddbd9;
  --accent-soft: #16302f;
  --blood: #e6394f;
  --nerve: #f2c94c;

  --font-display: "Space Grotesk", -apple-system, sans-serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius: 6px;
}

:root[data-theme="light"] {
  --bg: #eef1f5;
  --panel: #ffffff;
  --panel-alt: #e4e8ee;
  --ink: #10151f;
  --ink-dim: #5b6472;
  --line: #d3d9e2;
  --accent-soft: #d6f5f4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar { border-bottom: 1px solid var(--line); flex-shrink: 0; }
.topbar-inner { display: flex; align-items: center; gap: 14px; padding: 10px 16px; }
.brand {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--ink);
}
.brand .glyph { width: 22px; height: 22px; color: var(--accent); }
.topbar-actions { margin-left: auto; display: flex; gap: 8px; }
.pill-btn, .theme-toggle {
  background: var(--panel-alt); border: 1px solid var(--line); color: var(--ink);
  border-radius: 999px; padding: 6px 14px; font-family: var(--font-mono); font-size: 0.72rem; cursor: pointer;
}
.pill-btn:hover, .theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

.app { flex: 1; display: flex; min-height: 0; }

.sidebar {
  width: 300px; flex-shrink: 0; border-right: 1px solid var(--line); background: var(--panel);
  overflow-y: auto; padding: 16px;
}
.sidebar-section { margin-bottom: 26px; }
.sidebar-section h2 {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-dim); margin: 0 0 10px;
}
.seg { display: flex; padding: 3px; gap: 3px; border: 1px solid var(--line); border-radius: 999px; background: var(--panel-alt); }
.seg button {
  flex: 1; min-height: 44px; border: 0; border-radius: 999px; background: transparent; color: var(--ink-dim);
  font-family: var(--font-mono); font-size: 0.78rem; cursor: pointer;
}
.seg button:hover { color: var(--ink); }
.seg button[aria-checked="true"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.seg button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.system-list { display: flex; flex-direction: column; gap: 4px; }
.system-row {
  display: flex; align-items: center; gap: 8px; padding: 7px 8px; border-radius: var(--radius);
  cursor: pointer; font-size: 0.86rem; user-select: none;
}
.system-row:hover { background: var(--panel-alt); }
.system-row .sys-swatch { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.system-row .sys-count { margin-left: auto; color: var(--ink-dim); font-family: var(--font-mono); font-size: 0.72rem; }
.system-row input { accent-color: var(--accent); }

.toggle-row {
  display: flex; align-items: center; gap: 8px; font-size: 0.85rem; padding: 6px 0; cursor: pointer;
}
.toggle-row input { accent-color: var(--accent); }
.toggle-swatch { width: 22px; height: 4px; border-radius: 2px; }
.toggle-swatch.blood { background: var(--blood); }
.toggle-swatch.nerve { background: var(--nerve); }
.sidebar-note { font-size: 0.76rem; color: var(--ink-dim); margin: 8px 0 0; line-height: 1.5; }

/* Selection card: floats over the viewport (not in the sidebar) so it is visible
   on phones, where the sidebar stacks above the canvas, and sits next to the model. */
.selection-card {
  position: absolute; top: 14px; right: 14px; width: min(290px, calc(100% - 28px)); z-index: 5;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}
.selection-card[hidden] { display: none; }
.selection-card h3 { font-family: var(--font-display); font-size: 1.05rem; margin: 0 0 6px; padding-right: 22px; text-transform: capitalize; }
.selection-card .info-meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-dim); margin-bottom: 4px; }
.selection-card .info-kind {
  display: inline-block; font-family: var(--font-mono); font-size: 0.66rem; text-transform: uppercase;
  letter-spacing: 0.06em; padding: 2px 8px; border-radius: 999px; margin: 4px 0 8px; border: 1px solid var(--line);
}
.selection-card .card-close {
  position: absolute; top: 8px; right: 10px; background: none; border: none; color: var(--ink-dim);
  font-size: 1.1rem; line-height: 1; cursor: pointer;
}
.selection-card .card-close:hover { color: var(--ink); }
.card-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.card-actions .pill-btn { padding: 5px 12px; }
.card-mirror { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--line); font-size: 0.78rem; color: var(--ink-dim); }
.card-mirror a { color: var(--accent); cursor: pointer; text-transform: capitalize; }
.card-mirror label { display: flex; align-items: center; gap: 6px; margin-top: 4px; cursor: pointer; }
.card-mirror input { accent-color: var(--accent); }

.search-input {
  width: 100%; background: var(--panel-alt); border: 1px solid var(--line); color: var(--ink);
  border-radius: var(--radius); padding: 8px 10px; font-family: var(--font-body); font-size: 0.86rem;
}
.search-input:focus { outline: none; border-color: var(--accent); }
.search-results { margin-top: 6px; max-height: 260px; overflow-y: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.search-results[hidden] { display: none; }
.search-item {
  display: flex; justify-content: space-between; gap: 8px; width: 100%; text-align: left; background: none; border: none;
  border-bottom: 1px solid var(--line); color: var(--ink); padding: 7px 9px; font-family: var(--font-body); font-size: 0.82rem; cursor: pointer;
}
.search-item:last-child { border-bottom: none; }
.search-item:hover, .search-item.active { background: var(--accent-soft); }
.search-item .si-name { text-transform: capitalize; }
.search-item .si-sys { color: var(--ink-dim); font-family: var(--font-mono); font-size: 0.66rem; white-space: nowrap; align-self: center; }
.search-empty { padding: 8px 10px; font-size: 0.8rem; color: var(--ink-dim); }

.visibility-status {
  display: flex; align-items: center; gap: 10px; justify-content: space-between; margin-top: 10px;
  font-size: 0.78rem; color: var(--accent); background: var(--accent-soft); border-radius: var(--radius); padding: 6px 8px;
}
.visibility-status[hidden] { display: none; }

.viewport { position: relative; flex: 1; min-width: 0; background: var(--bg); }
#canvasHost { position: absolute; inset: 0; }
#canvasHost canvas { display: block; width: 100%; height: 100%; }
.viewport-hint {
  position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--ink-dim);
  background: rgba(10, 14, 20, 0.6); padding: 6px 14px; border-radius: 999px; pointer-events: none;
}
.loading-indicator {
  position: absolute; top: 16px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 0.74rem; color: var(--accent);
  background: var(--panel); border: 1px solid var(--line); padding: 6px 14px; border-radius: 999px;
}

footer {
  border-top: 1px solid var(--line); padding: 12px 16px; font-size: 0.72rem; color: var(--ink-dim);
  flex-shrink: 0; line-height: 1.5;
}
footer a { color: var(--accent); }

@media (max-width: 760px) {
  body { height: auto; overflow: auto; }
  .app { flex-direction: column; }
  .sidebar { width: auto; max-height: 44vh; border-right: none; border-bottom: 1px solid var(--line); }
  .viewport { height: 56vh; }
  .selection-card { top: auto; bottom: 44px; right: 8px; left: 8px; width: auto; }
  .sidebar { min-height: 0; }
}

.startup-error {
  position: fixed; top: 64px; left: 50%; transform: translateX(-50%); z-index: 50;
  max-width: min(640px, calc(100vw - 32px)); padding: 14px 18px; border-radius: 10px;
  background: var(--panel); border: 1px solid #d1495b; color: var(--ink); font-size: 0.85rem; line-height: 1.5;
}
.startup-error[hidden] { display: none; }
.startup-error code { font-family: var(--font-mono); background: rgba(127,127,127,0.18); padding: 1px 5px; border-radius: 4px; }
.startup-error a { color: var(--accent); }

.range-row { display: flex; align-items: center; gap: 12px; font-size: 0.85rem; color: var(--ink); }
.range-row input[type="range"] { flex: 1; accent-color: var(--accent); }