/* Home / start screen */
.home {
  align-items: center;
  text-align: center;
  padding-block: var(--space-4);
}

.home__preview {
  position: relative;
  width: min(260px, 62vw);
  margin-inline: auto;
  margin-bottom: var(--space-6);
  border: var(--border-width) solid var(--color-ink);
  background: var(--color-paper);
  padding: var(--space-4);
  overflow: hidden;
  animation: preview-bob 2.4s var(--ease-snap) infinite;
}

.home__preview-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 800 / 640;
}

.home__preview img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center center;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.home__preview-img--idle {
  opacity: 1;
  animation: preview-face-idle 2.2s steps(1, end) infinite;
}

.home__preview-img--hit {
  opacity: 0;
  animation: preview-face-hit 2.2s steps(1, end) infinite;
}

@keyframes preview-face-idle {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

@keyframes preview-face-hit {
  0%,
  49% {
    opacity: 0;
  }
  50%,
  100% {
    opacity: 1;
  }
}

@keyframes preview-bob {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

.home__rules {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: min(100%, 360px);
  margin-inline: auto;
  margin-bottom: var(--space-8);
  padding: var(--space-4);
  border: var(--border-thin) dashed var(--color-ink);
  text-align: left;
  font-size: var(--text-sm);
}

.home__rules li {
  display: grid;
  grid-template-columns: 2.5ch 1fr;
  gap: var(--space-2);
  line-height: 1.5;
}

.home__rules li::before {
  content: attr(data-n);
  font-family: var(--font-display);
  font-weight: 400;
}

.home__actions {
  width: min(100%, 420px);
  margin-inline: auto;
  margin-bottom: var(--space-6);
}

.home__save {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  width: min(100%, 420px);
}

.home__best,
.home__stats,
.home__save-hint {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  text-align: center;
}

.home__best {
  color: var(--color-ink);
  font-size: var(--text-sm);
}

.btn--tiny {
  min-height: 2rem;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

/* Play screen extras */
.play__controls {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  max-width: var(--board-max);
  margin-inline: auto;
  width: 100%;
}

.play__hint {
  text-align: center;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

/* Difficulty chips — 5 evenly stepped tiers */
.diff {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-2);
  width: min(100%, 420px);
  margin-inline: auto;
  margin-bottom: var(--space-5);
}

.diff__btn {
  min-height: 2.5rem;
  padding: var(--space-2) var(--space-1);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: var(--border-thin) solid var(--color-ink);
  background: transparent;
  transition:
    background var(--duration-fast) var(--ease-snap),
    color var(--duration-fast) var(--ease-snap);
}

.diff__btn.is-active,
.diff__btn:hover {
  background: var(--color-ink);
  color: var(--color-paper);
}

@media (max-width: 420px) {
  .diff {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}