* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #000000;
}
#container {
  display: flex;
  height: 100vh;
}
#canvas-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #ffffff;
}
#controls {
  width: 300px;
  padding: 20px;
  background-color: #000000;
  color: #ffffff;
  overflow-y: auto;
}
#controls h2 {
  margin-top: 0;
  color: #ffffff;
}
#controls label {
  display: block;
  margin: 10px 0;
  color: #cccccc;
}
#controls input[type="text"],
#controls select {
  width: 100%;
  padding: 8px;
  background-color: #222222;
  border: 1px solid #444444;
  color: #ffffff;
  border-radius: 4px;
}
#controls input[type="range"],
#controls input[type="color"] {
  width: 100%;
}
#controls input[type="range"]::-webkit-slider-thumb {
  background-color: #8B0000;
}
#controls input[type="range"]::-moz-range-thumb {
  background-color: #8B0000;
}
#controls input[type="color"] {
  padding: 0;
  border: none;
}
#controls button {
  margin: 8px 0;
  width: 100%;
  padding: 12px;
  background-color: #8B0000;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  transition: background-color 0.2s;
  cursor: pointer;
}
#controls button:hover {
  background-color: #a00000;
}

/* Responsive Layout */
@media (max-width: 768px) {
  /* Staple controls and canvas vertically */
  #container {
    flex-direction: column;
    height: auto;
  }
  /* Controls full width */
  #controls {
    width: 100%;
    padding: 15px;
  }
  /* Canvas container full width */
  #canvas-container {
    width: 100%;
    padding: 10px 0;
  }
  /* Scale canvas to container width */
  #tshirt-canvas {
    width: 100% !important;
    height: auto !important;
  }
}