*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #fafafa;
  overflow: hidden;
}

canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#ui {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 10;
  user-select: none;
}

#preset-btn {
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  color: rgba(255,255,255,0.95);
  background: rgba(0,0,0,0.6);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 6px 16px;
  border-radius: 20px;
  cursor: pointer;
  transition: border-color 0.3s, box-shadow 0.3s;
}

#preset-btn:hover {
  border-color: rgba(255,255,255,0.4);
  box-shadow: 0 0 12px rgba(255,255,255,0.1);
}

#instructions {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.35);
  pointer-events: none;
}