* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: radial-gradient(circle at top, #1e2749, #0c0f1b 70%);
  font-family: 'Space Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: #f0f4ff;
}

canvas {
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.45);
}

.info {
  max-width: 640px;
  text-align: center;
  margin-bottom: 24px;
}

.info h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.info p {
  margin: 0.35rem 0;
  color: rgba(240, 244, 255, 0.85);
}

.control {
  margin-top: 1.25rem;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control label {
  font-size: 0.9rem;
  color: rgba(240, 244, 255, 0.9);
}

.control input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.15);
  outline: none;
  -webkit-appearance: none;
}

.control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #6cf;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.control input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #6cf;
  cursor: pointer;
  border: none;
}