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

:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --border: #e5e5ea;
  --text: #1d1d1f;
  --text-secondary: #86868b;
  --ui-btn: #868686;
  --ui-btn-hover: #6a6a6a;
  --accent: #5b6cff;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --header-h: 52px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

/* Header */
.app-header {
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; flex-shrink: 0;
}
.logo-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.logo { font-size: 17px; font-weight: 600; letter-spacing: -0.02em; }
.logo-byline {
  font-size: 12px; font-weight: 500; color: #6e6e73;
  background: #f5f5f7; border: 1px solid #d2d2d7;
  border-radius: 999px; padding: 2px 10px; letter-spacing: 0.01em;
}
.header-right { display: flex; align-items: center; gap: 4px; }
.header-btn {
  padding: 6px 14px; font-size: 13px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--surface); color: var(--text-secondary);
  cursor: pointer; transition: all 0.15s;
}
.header-btn:hover { border-color: var(--ui-btn); color: var(--text); }

.app-layout { display: flex; height: calc(100vh - var(--header-h)); }

/* Controls panel */
.controls-panel {
  width: 380px; flex-shrink: 0;
  background: var(--surface); border-right: 1px solid var(--border);
  overflow-y: auto; padding: 16px 24px;
}
.controls-panel::-webkit-scrollbar { width: 6px; }
.controls-panel::-webkit-scrollbar-track { background: transparent; }
.controls-panel::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 3px; }
.controls-panel::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.18); }
.controls-panel { scrollbar-width: thin; scrollbar-color: rgba(0,0,0,0.1) transparent; }

.control-group {
  padding-top: 22px; padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}
.control-group:first-child { padding-top: 0; }
.control-group:last-child { border-bottom: none; padding-bottom: 0; }
.control-group h3 {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--text-secondary); margin-bottom: 10px;
  font-weight: 600; display: flex; align-items: center;
  justify-content: space-between; line-height: 20px;
}

.lock-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 5px;
  color: var(--border); cursor: pointer; transition: all 0.15s;
}
.lock-toggle:hover { background: var(--bg); color: var(--text-secondary); }
.lock-toggle.locked { color: var(--text); background: var(--bg); }

/* Toggle switch */
.toggle-switch {
  position: relative; display: inline-block !important;
  width: 36px; height: 20px; min-height: 20px !important;
  flex-shrink: 0; margin: 0; cursor: pointer;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-slider {
  position: absolute; top: 0; left: 0; width: 36px; height: 20px;
  background: var(--border); border-radius: 10px; transition: background 0.2s;
}
.toggle-slider::before {
  content: ''; position: absolute; left: 2px; top: 2px;
  width: 16px; height: 16px; background: #fff; border-radius: 50%;
  transition: transform 0.2s; box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}
.toggle-switch input:checked + .toggle-slider { background: #999; }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(16px); }

.toggle-options {
  margin-left: 10px; padding-left: 12px;
  border-left: 2px solid var(--border); margin-top: 4px;
}

.control-group label {
  display: grid; grid-template-columns: 100px 1fr auto;
  align-items: center; font-size: 13px; margin-bottom: 10px;
  gap: 6px; white-space: nowrap; min-height: 30px;
}
.control-group label:last-child { margin-bottom: 0; }

.control-group select {
  font-size: 12px; padding: 6px 8px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--text);
  cursor: pointer; width: 100%; min-width: 0; height: 30px;
}

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; min-width: 50px; height: 6px; border-radius: 3px;
  background: linear-gradient(to right, #999 0%, #999 50%, #e6e6e6 50%, #e6e6e6 100%);
  cursor: pointer; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 1px solid #ccc;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15); cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 1px solid #ccc;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15); cursor: pointer;
}

.range-val {
  font-size: 11px; color: var(--text-secondary);
  min-width: 38px; text-align: right;
  font-variant-numeric: tabular-nums; flex-shrink: 0;
}

.control-group label:has(select):not(:has(input[type="range"])) { grid-template-columns: 100px 1fr; }
.control-group label:has(.color-swatch):not(:has(input[type="range"])) { grid-template-columns: 100px 1fr; }
.control-group label:has(.color-swatch) .color-swatch { justify-self: end; }

/* Mesh point list */
.mesh-points-list {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 10px; min-height: 32px;
}
.mesh-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 8px 4px 4px;
  border-radius: 16px; background: var(--bg);
  border: 1px solid var(--border);
  cursor: pointer; transition: all 0.15s;
  font-size: 11px;
}
.mesh-chip.selected { border-color: var(--text); }
.mesh-chip .chip-dot {
  width: 18px; height: 18px; border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.1);
}
.mesh-chip .chip-idx { color: var(--text-secondary); font-variant-numeric: tabular-nums; }

.row-actions { display: flex; gap: 6px; margin-bottom: 10px; }
/* Shape buttons: 2x2 grid, each cell 50% width. */
.shape-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.shape-actions .small-btn { text-align: center; }
.small-btn.active {
  border-color: var(--ui-btn);
  background: var(--bg);
  color: var(--text);
}
.mesh-edit-row { display: flex; gap: 6px; margin-top: 8px; }
.mesh-hint { font-size: 10.5px; color: var(--text-secondary); margin-bottom: 6px; line-height: 1.4; }
.editor-group { margin-bottom: 14px; }
.editor-group:last-child { margin-bottom: 0; }
.editor-group .group-label {
  font-size: 10px; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-secondary);
  margin-bottom: 6px;
}
.small-btn.full-w { width: 100%; }

/* Width & Height keep the exact same grid as every other row, so all
   sliders are identical in length. The link lock floats inside the name
   column, vertically centered between the two rows, with short connector
   lines reaching up to Width and down to Height. */
.wh-group { position: relative; }
.wh-lock {
  position: absolute;
  left: 76px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  border: none; padding: 0; cursor: pointer;
  background: transparent;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--border); transition: color 0.15s;
  z-index: 1;
}
.wh-lock:hover { color: var(--text-secondary); }
.wh-lock.locked { color: var(--text); }
/* Connector lines tying the lock to the Width row (above) and Height row
   (below). */
.wh-lock::before,
.wh-lock::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 1px;
  height: 11px;
  background: var(--border);
  transform: translateX(-50%);
}
.wh-lock::before { bottom: 100%; }
.wh-lock::after { top: 100%; }

.dim { opacity: 0.45; pointer-events: none; }
.dim input[type="range"], .dim .color-swatch { pointer-events: none; }
.selected-hint {
  font-size: 11px; color: var(--text-secondary);
  margin-bottom: 10px; padding: 6px 8px;
  background: var(--bg); border-radius: 6px;
  text-align: center;
}
.selected-hint.active {
  background: rgba(91,108,255,0.08);
  color: var(--text);
}
.control-hint {
  font-size: 11px; color: var(--text-secondary);
  margin-bottom: 10px; line-height: 1.4;
}
.control-hint b { color: var(--text); font-weight: 600; }

/* Background tabs */
.bg-type-tabs {
  display: flex; gap: 3px; margin-bottom: 14px;
  background: var(--bg); border-radius: 8px; padding: 3px;
}
.bg-tab {
  flex: 1; padding: 5px 2px; font-size: 11px;
  border: none; background: transparent; border-radius: 6px;
  cursor: pointer; color: var(--text-secondary);
  font-weight: 500; transition: all 0.2s;
}
.bg-tab.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); }
.bg-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 10px; }

/* Timeline */
.toolbar-timeline { margin-bottom: 12px; }
.playback-controls { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.play-btn {
  width: 28px; height: 28px; border-radius: 50%; border: none;
  background: var(--ui-btn); color: white; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s; flex-shrink: 0;
}
.play-btn:hover { background: var(--ui-btn-hover); }
.time-display { font-size: 12px; color: var(--text-secondary); font-variant-numeric: tabular-nums; }
.timeline { position: relative; }
.timeline-track {
  position: relative; height: 28px;
  background: var(--bg); border-radius: 6px;
  cursor: pointer; overflow: visible;
}
.scrubber {
  position: absolute; top: -2px; width: 3px; height: 32px;
  background: var(--ui-btn); border-radius: 2px;
  cursor: ew-resize; transform: translateX(-1.5px);
  z-index: 5; transition: box-shadow 0.15s;
}
.scrubber:hover, .scrubber.dragging { box-shadow: 0 0 0 4px rgba(130,130,130,0.2); }
.keyframe-marker {
  position: absolute; top: 50%; width: 12px; height: 12px;
  background: var(--ui-btn); border: 2px solid var(--surface);
  border-radius: 50%; transform: translate(-50%, -50%);
  cursor: grab; z-index: 3; transition: transform 0.1s, box-shadow 0.15s;
}
.keyframe-marker:hover { transform: translate(-50%, -50%) scale(1.2); }
.keyframe-marker.selected { box-shadow: 0 0 0 3px rgba(130,130,130,0.3); transform: translate(-50%,-50%) scale(1.2); }
.timeline-actions { display: flex; gap: 6px; margin-top: 6px; }
.small-btn {
  padding: 4px 10px; font-size: 11px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--surface); color: var(--text-secondary);
  cursor: pointer; transition: all 0.2s;
}
.small-btn:hover { border-color: var(--ui-btn); color: var(--text); }

/* Canvas */
.canvas-area {
  flex: 1; min-width: 0; display: flex;
  align-items: center; justify-content: center;
  padding: 24px; overflow: hidden; position: relative;
}
.canvas-wrapper {
  position: relative; background: var(--surface);
  border-radius: var(--radius); border: 1px solid var(--border);
  overflow: hidden; box-shadow: var(--shadow-md); flex-shrink: 0;
}
.canvas-wrapper canvas {
  width: 100%; height: 100%; display: block; position: absolute; inset: 0;
}
.overlay-canvas { pointer-events: auto; z-index: 2; background: transparent !important; }
#glCanvas { z-index: 1; }

/* Zoom */
.zoom-controls {
  position: absolute; bottom: 16px; right: 16px;
  display: flex; gap: 2px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 100px;
  padding: 4px; box-shadow: var(--shadow-sm);
}
.zoom-btn {
  width: 30px; height: 30px; border: none; background: transparent;
  color: var(--text-secondary); font-size: 15px; font-weight: 500;
  cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.zoom-btn:hover { background: var(--bg); color: var(--text); }
.zoom-btn.zoom-fit { font-size: 11px; font-weight: 600; width: auto; padding: 0 10px; border-radius: 100px; }

/* Tool pill */
.tool-pill {
  position: absolute; top: 16px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 2px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 100px;
  padding: 4px; box-shadow: var(--shadow-sm); z-index: 10;
}
.tool-btn {
  width: 34px; height: 30px; border: none; background: transparent;
  color: var(--text-secondary); font-size: 14px; cursor: pointer;
  border-radius: 100px; transition: all 0.15s;
}
.tool-btn:hover { background: var(--bg); color: var(--text); }
.tool-btn.active { background: var(--text); color: white; }

/* Playbar */
.bottom-playbar {
  position: absolute; bottom: 16px; left: 16px; right: 140px;
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 100px; padding: 4px 14px 4px 4px;
  box-shadow: var(--shadow-sm);
}
.bottom-playbar .play-btn { width: 30px; height: 30px; }
.playbar-track {
  flex: 1; height: 6px; background: var(--bg);
  border-radius: 3px; cursor: pointer; position: relative;
}
.playbar-progress { height: 100%; background: var(--ui-btn); border-radius: 3px; width: 0%; pointer-events: none; }
.playbar-time { font-size: 11px; color: var(--text-secondary); font-variant-numeric: tabular-nums; white-space: nowrap; flex-shrink: 0; }

/* Export */
.export-btn {
  width: 100%; padding: 12px; border: none; border-radius: 8px;
  background: var(--text); color: white;
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: all 0.2s; margin-top: 8px;
}
.export-btn:hover:not(:disabled) { background: #333; }
.export-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.export-progress { margin-top: 12px; }
.progress-bar { height: 6px; background: var(--bg); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--ui-btn); border-radius: 3px; width: 0%; transition: width 0.3s; }
.progress-text { font-size: 11px; color: var(--text-secondary); margin-top: 6px; display: block; }

/* Color swatch */
.color-swatch {
  width: 32px; height: 30px; border-radius: 6px;
  border: 1px solid var(--border); cursor: pointer;
  display: inline-block; flex-shrink: 0; transition: box-shadow 0.15s;
}
.color-swatch:hover { box-shadow: 0 0 0 2px rgba(130,130,130,0.3); }

/* Dropdown */
.dropdown-panel {
  position: fixed; z-index: 900;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 8px 30px rgba(0,0,0,0.12);
  padding: 6px; width: 240px; max-height: 400px; overflow-y: auto;
}
.dropdown-item {
  display: flex; flex-direction: column; gap: 2px;
  padding: 10px 12px; border-radius: 7px; cursor: pointer;
  transition: background 0.12s;
}
.dropdown-item:hover { background: var(--bg); }
.dropdown-item strong { font-size: 13px; font-weight: 600; color: var(--text); }
.dropdown-item span { font-size: 11px; color: var(--text-secondary); }

/* Color picker */
.cp-overlay { position: fixed; inset: 0; z-index: 1000; }
.cp-popup {
  position: fixed; background: var(--surface);
  border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
  padding: 16px; width: 260px; z-index: 1001;
}
.cp-body { display: flex; gap: 10px; margin-bottom: 12px; }
.cp-sv { border-radius: 6px; cursor: crosshair; display: block; }
.cp-hue { border-radius: 6px; cursor: pointer; display: block; }
.cp-footer { display: flex; align-items: center; gap: 8px; }
.cp-preview { width: 32px; height: 32px; border-radius: 6px; border: 1px solid var(--border); flex-shrink: 0; }
.cp-hex {
  flex: 1; font-size: 13px; font-family: monospace;
  padding: 6px 8px; border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--text); min-width: 0;
}
.cp-ok {
  padding: 6px 14px; border: none; border-radius: 6px;
  background: var(--text); color: white;
  font-size: 13px; font-weight: 600; cursor: pointer;
}
.cp-ok:hover { background: #333; }

.hidden { display: none !important; }

@media (max-width: 768px) {
  body { height: auto; overflow: auto; }
  .app-layout { flex-direction: column; height: auto; }
  .controls-panel { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
  .canvas-area { padding: 16px; min-height: 50vh; }
  .canvas-wrapper { max-height: 60vh; }
}