* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: #000;
}

canvas {
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  image-rendering: pixelated;
  /* Width and height are set in px by main.ts resize() to match canvas.width/height
     exactly — no CSS scaling, so mouse coordinates always equal canvas coordinates. */
  /* Prevents double-tap zoom, scroll, pull-to-refresh on mobile */
  touch-action: none;
}

/* Portrait-rotate overlay — hidden by default; shown only when phone is portrait */
#rotate-prompt {
  display: none;
  position: fixed;
  width: 100dvw;
  height: 100dvh;
  top: 0;
  left: 0;
  z-index: 9999;
  background: #000;
  color: #fff;
  font-family: Impact, sans-serif;
  font-size: 1.3rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  text-align: center;
}

.rotate-icon {
  font-size: 3rem;
  animation: spin 2s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Show overlay on portrait mobile (hover:none = touchscreen) */
@media (orientation: portrait) and (hover: none) and (pointer: coarse) {
  #rotate-prompt { display: flex; }
}

/* Zero-div for safe-area inset reading in JS */
#safe-probe {
  position: fixed;
  pointer-events: none;
  padding: 0;
  padding-left:   env(safe-area-inset-left,   0px);
  padding-right:  env(safe-area-inset-right,  0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}