/* Activity dialogs and the memory game inside them */
.game-dialog {
  width: min(820px, calc(100vw - 24px));
  max-height: calc(100vh - 24px);
  padding: 32px clamp(16px, 4vw, 40px) 36px;
  border: none;
  border-radius: 28px;
  background: #fff;
  text-align: center;
  font-family: "Rubik", system-ui, sans-serif;
}

.game-dialog-small {
  width: min(460px, calc(100vw - 24px));
}

.game-dialog::backdrop {
  background: rgba(0, 60, 30, 0.5);
}

.dialog-close {
  position: absolute;
  top: 14px;
  right: 16px;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: #eef3d0;
  color: var(--green);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.game-title {
  margin: 0;
  font-family: "Lilita One", sans-serif;
  font-weight: normal;
  font-size: clamp(30px, 5vw, 44px);
  color: var(--green);
}

.game-hint {
  margin: 6px 0 18px;
  font-family: "Chilanka", "Mynerve", cursive;
  font-size: clamp(18px, 2.6vw, 24px);
  color: var(--green-light);
}

.game-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 20px;
  font-size: 17px;
  color: var(--green-dark);
}

.game-stats strong {
  font-weight: 600;
  color: var(--green);
}

.game-board-wrap {
  position: relative;
}

.game-board {
  --card-radius: clamp(12px, 2.4vw, 22px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(8px, 2vw, 18px);
}

/* --- Cards --- */
.game-card {
  aspect-ratio: 1;
  padding: 0;
  border: none;
  background: none;
  perspective: 1000px;
  cursor: pointer;
}

.game-card:focus-visible {
  outline: 4px solid var(--green);
  outline-offset: 4px;
  border-radius: var(--card-radius);
}

.game-card-inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s ease;
}

.game-card.is-flipped .game-card-inner {
  transform: rotateY(180deg);
}

.game-card-back,
.game-card-front {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: var(--card-radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  font-size: clamp(32px, 8vw, 72px);
  line-height: 1;
}

/* Swap faces halfway through the flip; backface-visibility alone is not
   reliable in every browser */
.game-card-front,
.game-card.is-flipped .game-card-back {
  visibility: hidden;
  transition: visibility 0s 0.22s;
}

.game-card-back,
.game-card.is-flipped .game-card-front {
  visibility: visible;
  transition: visibility 0s 0.22s;
}

.game-card-back {
  background:
    radial-gradient(circle at 22% 25%, rgba(255, 255, 255, 0.18) 0 12%, transparent 13%),
    radial-gradient(circle at 78% 75%, rgba(255, 255, 255, 0.18) 0 16%, transparent 17%),
    #35c13b;
  box-shadow: 0 5px 0 #23922b;
  color: #fff;
  font-family: "Lilita One", sans-serif;
  transition: transform 0.15s, visibility 0s 0.22s;
}

.game-card:hover:not(.is-flipped) .game-card-back {
  transform: translateY(-4px);
}

.game-card-front {
  transform: rotateY(180deg);
  border: 5px solid var(--lime);
}

.game-card.is-matched {
  cursor: default;
}

.game-card.is-matched .game-card-front {
  border-color: var(--green-light);
  animation: match-pop 0.5s ease;
}

@keyframes match-pop {
  50% { transform: rotateY(180deg) scale(1.08); }
}

/* --- Win message --- */
.game-win {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 10px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  animation: win-in 0.35s ease;
}

.game-win[hidden] {
  display: none;
}

.game-win-title {
  margin: 0;
  font-family: "Lilita One", sans-serif;
  font-size: clamp(28px, 5vw, 44px);
  color: var(--green);
}

.game-win-text {
  margin: 0 0 10px;
  font-size: 18px;
}

@keyframes win-in {
  from { opacity: 0; transform: scale(0.95); }
}

.game-button {
  padding: 12px 30px;
  border: none;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 4px 0 var(--green-dark);
  color: #fff;
  font-family: "Fredoka", sans-serif;
  font-weight: 600;
  font-size: 18px;
  cursor: pointer;
}

.game-button:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 var(--green-dark);
}

@media (prefers-reduced-motion: reduce) {
  .game-card-inner,
  .game-card.is-matched .game-card-front,
  .game-win {
    transition: none;
    animation: none;
  }
}

@media (max-width: 520px) {
  .game-board {
    grid-template-columns: repeat(3, 1fr);
  }
}