* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: #0a0a0a;
  color: #e0e0e0;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

#app {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

h1 {
  font-size: 48px;
  font-weight: 300;
  letter-spacing: 8px;
  text-transform: uppercase;
  margin: 0 0 30px 0;
  color: #ffffff;
}

#canvas-container {
  margin-bottom: 40px;
}

canvas {
  display: block;
  border-radius: 4px;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.control-group {
  background: #141414;
  padding: 24px;
  border-radius: 8px;
  border: 1px solid #252525;
}

.control-group h2 {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin: 0 0 20px 0;
  color: #888;
}

.control-item {
  margin-bottom: 16px;
}

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

.control-item label {
  display: block;
  font-size: 12px;
  color: #666;
  margin-bottom: 6px;
}

.control-item input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: #333;
  border-radius: 2px;
  outline: none;
}

.control-item input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.1s;
}

.control-item input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.control-item input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.checkbox-item label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: #e0e0e0;
}

.checkbox-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: #fff;
  cursor: pointer;
}

.select-item select {
  width: 100%;
  padding: 8px 12px;
  font-size: 14px;
  background: #1a1a1a;
  color: #e0e0e0;
  border: 1px solid #333;
  border-radius: 4px;
  cursor: pointer;
  outline: none;
}

.select-item select:hover {
  border-color: #555;
}

.select-item select:focus {
  border-color: #fff;
}

.spacer {
  height: 50px; /* Same height as select-item (label + select) */
}

#download-btn {
  display: block;
  width: 100%;
  margin-top: 40px;
  padding: 16px 32px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #0a0a0a;
  background: #ffffff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

#download-btn:hover {
  background: #e0e0e0;
  transform: translateY(-1px);
}

#download-btn:active {
  transform: translateY(0);
}