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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #1e1e1e;
  color: #d4d4d4;
  display: flex;
  height: 100vh;
}

.controls {
  width: 500px;
  padding: 20px;
  background: #252526;
  overflow-y: auto;
  border-right: 1px solid #3e3e42;
  display: flex;
  flex-direction: column;
}

.controls h1 {
  font-size: 20px;
  margin-bottom: 20px;
  color: #fff;
}

.control-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-bottom: 15px;
  min-height: 0;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  color: #cccccc;
}

.control-group textarea {
  flex: 1;
  width: 100%;
  padding: 10px;
  background: #1e1e1e;
  border: 1px solid #3e3e42;
  color: #d4d4d4;
  border-radius: 3px;
  font-size: 12px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  resize: none;
  line-height: 1.5;
  min-height: 0;
}

.control-group textarea:focus {
  outline: none;
  border-color: #007acc;
}

.range-value {
  display: inline-block;
  margin-left: 10px;
  color: #569cd6;
  font-weight: 500;
}

button {
  width: 100%;
  padding: 10px;
  background: #0e639c;
  color: white;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  margin-top: 10px;
}

button:hover {
  background: #1177bb;
}

button:active {
  background: #0d5a8f;
}

.canvas-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

canvas {
  width: 100%;
  height: 100%;
  max-width: 800px;
  max-height: 800px;
  background: white;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.expression-display {
  margin-top: 20px;
  padding: 15px;
  background: #1e1e1e;
  border: 1px solid #3e3e42;
  border-radius: 3px;
}

.expression-display h3 {
  font-size: 13px;
  color: #cccccc;
  margin-bottom: 10px;
}

.expression-display #expression {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 12px;
  color: #4ec9b0;
  word-wrap: break-word;
  line-height: 1.6;
  padding: 8px;
  background: #0e0e0e;
  border-radius: 2px;
  max-height: 150px;
  overflow-y: auto;
}

.info {
  font-size: 11px;
  color: #858585;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid #3e3e42;
}