* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at 30% 20%, #191325 0%, #0c0b10 55%, #000 100%);
  color: #f3f3f3;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
}

h1 {
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: 0.03em;
  color: #f25eff;
  text-shadow: 0 0 10px #f25eff66;
}

canvas {
  width: min(960px, 96vw);
  height: auto;
  border: 2px solid #5f4cff;
  border-radius: 8px;
  background: #0b0b0f;
  box-shadow: 0 0 18px #5f4cff55;
}

.hint {
  margin: 0;
  opacity: 0.85;
  font-size: 0.92rem;
}