:root {
  color-scheme: dark;
  --screen-bg: #000000;
  --screen-edge: #7df5ff;
  --accent: #ffcf54;
  --frame-shadow: rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(19, 67, 88, 0.32), transparent 32%),
    radial-gradient(circle at bottom, rgba(111, 34, 19, 0.22), transparent 30%),
    #000000;
  color: #f5f5f5;
  font-family: "Lucida Console", "Courier New", monospace;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding:
    max(16px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom))
    max(16px, env(safe-area-inset-left));
}

.app-shell {
  width: min(100%, 820px);
  display: grid;
  gap: 12px;
  justify-items: center;
}

.game-frame {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(125, 245, 255, 0.28);
  border-radius: 18px;
  padding: clamp(10px, 2.5vw, 18px);
  background:
    linear-gradient(180deg, rgba(28, 58, 73, 0.22), rgba(6, 11, 14, 0.84)),
    rgba(0, 0, 0, 0.88);
  box-shadow:
    0 14px 48px var(--frame-shadow),
    inset 0 0 32px rgba(125, 245, 255, 0.08),
    inset 0 -16px 30px rgba(255, 114, 70, 0.08);
}

#game {
  width: min(100%, calc(100vh * 1.33));
  max-width: min(100%, 760px);
  aspect-ratio: 4 / 3;
  background: #000000;
  border: 1px solid rgba(125, 245, 255, 0.36);
  border-radius: 12px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  box-shadow:
    inset 0 0 20px rgba(125, 245, 255, 0.16),
    0 0 24px rgba(16, 95, 123, 0.22);
  touch-action: none;
}

.install-button {
  appearance: none;
  border: 1px solid rgba(255, 207, 84, 0.55);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255, 207, 84, 0.18), rgba(255, 120, 72, 0.12));
  color: #fff4c7;
  padding: 10px 16px;
  font: inherit;
  cursor: pointer;
}

.install-button:hover {
  border-color: rgba(255, 207, 84, 0.82);
}

.help-copy {
  margin: 0;
  max-width: 70ch;
  text-align: center;
  line-height: 1.5;
  color: rgba(238, 246, 250, 0.74);
  font-size: 0.88rem;
}

@media (max-width: 700px) {
  body {
    padding:
      max(10px, env(safe-area-inset-top))
      max(10px, env(safe-area-inset-right))
      max(10px, env(safe-area-inset-bottom))
      max(10px, env(safe-area-inset-left));
  }

  .game-frame {
    padding: 8px;
    border-radius: 12px;
  }

  #game {
    width: 100%;
    border-radius: 10px;
  }

  .help-copy {
    font-size: 0.78rem;
  }
}