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

:root {
  --panel-width: 280px;
  --panel-collapsed-width: 44px;
  --panel-transition: 180ms ease;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  background: #121212;
  color: #d9d9d9;
  overflow: hidden;
}

#container {
  display: flex;
  width: 100vw;
  height: 100vh;
}

#canvas {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: block;
  background: #121212;
}

#controls {
  width: var(--panel-width);
  background: #1e1e1e;
  border-left: 1px solid #333;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition:
    width var(--panel-transition),
    min-width var(--panel-transition);
  min-width: var(--panel-width);
}

#controls.collapsed {
  width: var(--panel-collapsed-width);
  min-width: var(--panel-collapsed-width);
}

#controlsHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 12px 12px 16px;
  border-bottom: 1px solid #333;
}

#controlsTitle {
  font-size: 16px;
  color: #d9d9d9;
  white-space: nowrap;
}

#controlsToggle {
  width: 32px;
  min-width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid #333;
  background: #2a2a2a;
  color: #d9d9d9;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  transition: all 0.2s;
}

#controlsToggle:hover {
  background: #3a3a3a;
  border-color: #4a9eff;
}

#controlsBody {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  opacity: 1;
  transition: opacity 120ms ease;
}

#controls.collapsed #controlsBody {
  opacity: 0;
  pointer-events: none;
}

#controls.collapsed #controlsTitle {
  display: none;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #a0a0a0;
}

input[type='range'] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #333;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #4a9eff;
  cursor: pointer;
  transition: background 0.2s;
}

input[type='range']::-webkit-slider-thumb:hover {
  background: #2196f3;
}

input[type='range']::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #4a9eff;
  cursor: pointer;
  border: none;
  transition: background 0.2s;
}

input[type='range']::-moz-range-thumb:hover {
  background: #2196f3;
}

.value-display {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.value-display strong {
  color: #4a9eff;
  font-weight: 600;
}

.button-group {
  display: flex;
  gap: 10px;
}

button {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid #333;
  background: #2a2a2a;
  color: #d9d9d9;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
}

button:hover {
  background: #3a3a3a;
  border-color: #4a9eff;
}

button:active {
  background: #1a1a1a;
}

.stats {
  padding: 12px;
  background: #252525;
  border-radius: 4px;
  border-left: 3px solid #4a9eff;
  font-size: 13px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}

.stat-item:last-child {
  margin-bottom: 0;
}

.stat-label {
  color: #a0a0a0;
}

.stat-value {
  color: #4a9eff;
  font-weight: 600;
  font-family: 'Courier New', monospace;
}

#fps {
  color: #4a9eff;
  font-size: 13px;
  font-family: 'Courier New', monospace;
}

.divider {
  height: 1px;
  background: #333;
}
