:root {
  --accent: #d79d18;
  --accent-dark: #75570f;
  --wash: #f1d98b;
}

.letter-stage {
  width: min(100%, 520px);
}

.letter-card {
  position: relative;
  display: grid;
  overflow: hidden;
  width: 100%;
  min-height: min(50vh, 390px);
  min-height: min(50dvh, 390px);
  padding: 24px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  border-radius: 34px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0.28)),
    var(--wash);
  box-shadow: var(--shadow);
  color: var(--ink);
  cursor: pointer;
  place-items: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: transform 160ms ease, background 300ms ease, border-color 300ms ease;
}

.letter-card::before,
.letter-card::after {
  position: absolute;
  border: 2px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: 50%;
  content: "";
}

.letter-card::before {
  top: -52px;
  right: -30px;
  width: 130px;
  height: 130px;
}

.letter-card::after {
  bottom: -45px;
  left: -35px;
  width: 106px;
  height: 106px;
}

.letter-card:hover {
  transform: translateY(-3px);
}

.letter-card:active {
  transform: scale(0.985);
}

.letter-card.is-playing {
  border-color: var(--accent);
}

.letter {
  display: block;
  font-family: "Comic Neue", "Comic Sans MS", "Chalkboard SE", cursive;
  font-size: clamp(8.5rem, 42vw, 15.5rem);
  font-variant-ligatures: none;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 0.78;
  transform-origin: center;
}

.letter.is-changing {
  animation: letter-pop 260ms cubic-bezier(0.2, 0.85, 0.35, 1.2);
}

.tap-hint {
  position: absolute;
  right: 18px;
  bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: color-mix(in srgb, var(--ink) 80%, var(--accent));
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.letter-sound-button {
  display: flex;
  width: 100%;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  border: 0;
  border-radius: 17px;
  background: var(--accent);
  color: white;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.letter-sound-button:active {
  transform: scale(0.98);
}

.letter-sound-button:disabled {
  cursor: wait;
  opacity: 0.75;
}

@keyframes letter-pop {
  0% {
    opacity: 0;
    transform: scale(0.72) rotate(-3deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

@media (min-width: 700px) {
  .letter-card {
    min-height: min(53vh, 500px);
    min-height: min(53dvh, 500px);
    border-radius: 42px;
  }

  .tap-hint {
    right: 24px;
    bottom: 24px;
  }
}

@media (min-width: 1000px) and (min-height: 720px) {
  .letter-card {
    width: min(52vw, 560px);
  }
}

@media (max-height: 620px) {
  .letter-card {
    min-height: 270px;
  }

  .letter {
    font-size: clamp(7rem, 31vh, 11rem);
  }

  .letter-sound-button {
    min-height: 46px;
    margin-top: 8px;
  }
}