* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: #000;
  color: #fff;
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Mono", Consolas, "Courier New", monospace;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

main {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 12px;
}

.screen {
  position: relative;
  width: min(100%, 1100px);
  aspect-ratio: 2 / 1;
  background: #000;
  border: 1px solid #1c1c1c;
}

/* leve efeito de monitor CRT por cima do canvas */
.screen::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.025) 0,
    rgba(255, 255, 255, 0.025) 1px,
    transparent 1px,
    transparent 3px
  );
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}

.hint {
  font-size: 12px;
  color: #777;
  text-align: center;
  line-height: 1.6;
  max-width: 1000px;
}

.hint b { color: #ccc; font-weight: normal; }