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

body {
  background: #000;
  overflow: hidden;
  font-family: -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: #fff;
  user-select: none;
  -webkit-user-select: none;
}

#canvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

/* ── Control Panel ── */

#panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

#panel.hidden {
  transform: translateY(100%);
}

#panel-tab {
  width: 40px;
  height: 24px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.85);
  border-radius: 8px 8px 0 0;
  color: #666;
  font-size: 10px;
  cursor: pointer;
  transition: color 0.2s;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

#panel-tab:hover {
  color: #fff;
}

#panel.hidden #panel-tab {
  transform: translateY(-100%);
  position: absolute;
  bottom: 0;
  left: 50%;
  margin-left: -20px;
}

#panel-content {
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid #222;
  padding: 14px 20px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  max-height: 45vh;
  overflow: hidden;
}

/* ── Left Column: Pattern + Actions ── */

#panel-left {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-shrink: 0;
  min-width: 180px;
}

/* ── Pattern Selector ── */

#pattern-selector {
  display: flex;
  align-items: center;
  gap: 10px;
}

#pattern-name {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  min-width: 150px;
  text-align: center;
  text-transform: uppercase;
}

#pattern-selector button {
  background: none;
  border: 1px solid #333;
  color: #888;
  width: 28px;
  height: 28px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

#pattern-selector button:hover {
  border-color: #fff;
  color: #fff;
}

/* ── Action Buttons ── */

#actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

#actions button {
  background: none;
  border: 1px solid #333;
  color: #888;
  padding: 5px 10px;
  border-radius: 5px;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

#actions button:hover {
  border-color: #fff;
  color: #fff;
}

/* ── Controls (Sliders) — scrollable grid ── */

#controls {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 6px 20px;
  flex: 1;
  min-width: 0;
  max-height: calc(45vh - 28px);
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 8px;
}

/* Custom scrollbar */
#controls::-webkit-scrollbar {
  width: 4px;
}
#controls::-webkit-scrollbar-track {
  background: transparent;
}
#controls::-webkit-scrollbar-thumb {
  background: #444;
  border-radius: 2px;
}
#controls::-webkit-scrollbar-thumb:hover {
  background: #666;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 26px;
}

.control-group label {
  font-size: 10px;
  color: #666;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  min-width: 72px;
  max-width: 72px;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.control-group input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100px;
  height: 3px;
  background: #333;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  flex-shrink: 0;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  border: none;
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  border: none;
}

.control-group input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 0 6px rgba(255,255,255,0.3);
}

.control-group .value {
  font-size: 10px;
  color: #aaa;
  min-width: 34px;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* ── Help Overlay ── */

#help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#help-overlay.hidden {
  display: none;
}

#help-box {
  text-align: center;
}

#help-box h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #666;
  margin-bottom: 20px;
}

.shortcut {
  font-size: 13px;
  color: #bbb;
  margin-bottom: 8px;
}

kbd {
  background: #1a1a1a;
  border: 1px solid #444;
  border-radius: 4px;
  padding: 2px 8px;
  font-family: inherit;
  font-size: 11px;
  color: #fff;
}

.dismiss {
  margin-top: 24px;
  font-size: 11px;
  color: #444;
}