* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: #111;
}

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  font-family: "Courier New", monospace;
}

main {
  position: relative;
  display: grid;
  place-items: center;
  width: 100vw;
  height: 100dvh;
}

canvas {
  display: block;
  width: min(100vw, calc(100dvh * 1.3125));
  height: min(100dvh, calc(100vw / 1.3125));
  background: #aaa;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.75);
  touch-action: none;
  cursor: default;
}

#loading {
  position: absolute;
  z-index: 2;
  margin: 0;
  color: white;
  font-size: 14px;
}

body.is-ready #loading {
  display: none;
}

.help-button {
  position: absolute;
  z-index: 4;
  top: max(12px, env(safe-area-inset-top));
  right: max(12px, env(safe-area-inset-right));
  min-height: 42px;
  padding: 0 18px;
  color: #f3f3f3;
  border: 1px solid rgba(255, 255, 255, .55);
  border-radius: 999px;
  background: rgba(22, 22, 22, .84);
  font: 700 13px "Courier New", monospace;
  cursor: pointer;
}

.rules-overlay {
  position: fixed;
  z-index: 10;
  inset: 0;
  display: none;
  padding: 20px;
  place-items: center;
  color: #f4f4f4;
  background: rgba(10, 10, 10, .78);
  backdrop-filter: blur(8px);
}

.rules-overlay.is-visible { display: grid; }

.rules-dialog {
  width: min(560px, 100%);
  max-height: calc(100dvh - 40px);
  overflow-y: auto;
  padding: clamp(26px, 6vw, 48px);
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 18px;
  background: #1c1c1c;
  box-shadow: 0 30px 100px rgba(0, 0, 0, .6);
}

.rules-kicker {
  margin: 0 0 8px;
  color: #f0b64e;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
}

.rules-dialog h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1;
}

.rules-dialog > p:not(.rules-kicker),
.rules-dialog li {
  color: #c4c4c4;
  line-height: 1.55;
}

.rules-dialog ul { margin: 18px 0 24px; padding-left: 20px; }
.rules-dialog li + li { margin-top: 8px; }

.rules-primary {
  width: 100%;
  min-height: 50px;
  border: 0;
  border-radius: 999px;
  color: #101010;
  background: #f0b64e;
  font: 700 14px "Courier New", monospace;
  cursor: pointer;
}

@media (max-width: 560px) {
  .help-button { min-height: 38px; padding: 0 14px; font-size: 12px; }
}