/* Memory Game */

#moves {
    font-size: 1.05rem;
    margin: var(--space-4) 0;
    padding: var(--space-4);
    background-color: var(--highlight-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
}

.game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-3);
    margin: var(--space-6) auto;
    max-width: 600px;
    perspective: 1000px;
}

.card {
    height: 120px;
    background-color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5em;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s var(--ease-out), background-color var(--dur-base) var(--ease-out);
    box-shadow: var(--shadow-1);
    color: #fff;
}

.card.flipped {
    transform: rotateY(180deg);
    background-color: var(--surface-color);
    color: var(--text-color);
}

.card::before { /* Card back */
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    border-radius: var(--radius-md);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.card.flipped::before {
    display: none;
}

.card .symbol {
    transform: rotateY(180deg);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: block;
}

.card.matched {
    background-color: var(--success-color);
    border-color: var(--success-color);
    transform: rotateY(180deg) scale(0.95);
    pointer-events: none;
    animation: matchPulse 1s var(--ease-out);
    color: #fff;
}

@keyframes matchPulse {
    0%   { transform: rotateY(180deg) scale(0.95); }
    50%  { transform: rotateY(180deg) scale(1.05); }
    100% { transform: rotateY(180deg) scale(0.95); }
}

@media (prefers-reduced-motion: reduce) {
    .card { transition: background-color var(--dur-base) var(--ease-out); }
    .card.matched { animation: none; }
}

@media (max-width: 768px) {
    .game-board { grid-template-columns: repeat(4, 1fr); gap: var(--space-2); }
    .card { height: 90px; font-size: 2em; }
}

@media (max-width: 480px) {
    .card { height: 72px; font-size: 1.5em; }
}