.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    padding: 12px 25px;
    background: linear-gradient(to bottom, var(--gold), #d4ac0d);
    border: 3px solid var(--primary-brown);
    border-radius: 8px;
    color: var(--primary-brown);
    text-decoration: none;
    font-family: 'Pirata One', cursive;
    font-size: 1.2em;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    text-shadow: 1px 1px 1px rgba(255, 255, 255, 0.5);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
    background: linear-gradient(to bottom, #FFD700, var(--gold));
}

.back-button:active {
    transform: translateY(1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
    .back-button {
        top: 10px;
        left: 10px;
        padding: 8px 15px;
        font-size: 1em;
    }
}

.game-page h1 {
    font-size: 90px;
    color: var(--gold);
    text-shadow: 
        0 0 20px rgba(255, 215, 0, 0.7),
        3px 3px 6px rgba(0, 0, 0, 0.8);
    margin: 10px 0 20px 0;
    text-align: center;
    animation: titleGlow 2s infinite alternate;
}
.game-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 20px;
    padding: 20px;
    height: 100vh;
    box-sizing: border-box;
}
.game-board {
    display: grid;
    grid-template-columns: repeat(6, minmax(100px, 160px));
    grid-template-rows: repeat(3, 1fr);
    gap: 8px;
    width: 80vw;
    max-width: 1000px;
    margin: auto;
    padding: 10px;
    justify-content: center;
    align-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.2);
}
.card {
    width: 100%;
    aspect-ratio: 1;
    max-width: 160px;
    margin: 0;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border-radius: 12px;
    border: 2px solid var(--gold);
}
.card:hover:not(.flipped):not(.matched) {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.3);
}
.card.flipped {
    transform: rotateY(180deg);
}
.card.matched {
    animation: cardMatch 0.5s ease-in-out;
    border: 3px solid #4CAF50;
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.5);
}
.card.wrong {
    animation: wrongShake 0.5s ease-in-out;
}
.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--gold);
}
.card-front {
    background: url('images/card-back.png') center/cover;
    border: 3px solid var(--gold);
}
.card-back {
    background: #F5F5DC;
    transform: rotateY(180deg);
    border: 3px solid var(--gold);
}
.card-back img {
    width: 80%;
    height: 80%;
    object-fit: contain;
    filter: brightness(1.2);
}
@keyframes cardMatch {
    0% { transform: scale(1) rotateY(180deg); }
    50% { transform: scale(1.1) rotateY(180deg); }
    100% { transform: scale(1) rotateY(180deg); }
}
@keyframes wrongShake {
    0%, 100% { transform: translateX(0) rotateY(180deg); }
    25% { transform: translateX(-10px) rotateY(180deg); }
    75% { transform: translateX(10px) rotateY(180deg); }
}
@media (max-width: 768px) {
    .game-page h1 {
        font-size: 60px;
    }
    .game-board {
        grid-template-columns: repeat(6, minmax(80px, 120px));
        gap: 5px;
    }
    .card {
        max-width: 120px;
    }
}