:root {
  --bg-color: #1a1a1a;
  --text-color: #f0f0f0;
  --accent-color: #00bcd4;
  --secondary-color: #ff4081;
  --panel-bg: #2a2a2a;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 800px;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

header {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.back-link {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: bold;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

.canvas-container {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
}

canvas {
  background-color: #000;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  cursor: crosshair;
  max-width: 100%;
  touch-action: none; /* Prevent scrolling while drawing */
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  width: 100%;
  justify-content: center;
  background-color: var(--panel-bg);
  padding: 15px;
  border-radius: 8px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

button {
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  background-color: #444;
  color: white;
  cursor: pointer;
  transition: background-color 0.2s;
}

button:hover:not(:disabled) {
  background-color: #555;
}

button.active {
  background-color: var(--accent-color);
  color: #000;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

input[type="range"] {
    width: 150px;
}

#epicycles-count {
  display: inline-block;
  width: 30px;
  text-align: right;
}

.instructions {
    text-align: center;
    color: #aaa;
    margin: 0;
}