.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Game Grid */
.memory-grid {
    display: grid;
    grid-template-columns: repeat(4, 80px);
    grid-template-rows: repeat(4, 80px);
    gap: 10px;
    margin: 30px 0;
}

.memory-card {
    width: 80px;
    height: 80px;
    background-color: #b0c4de;
    border: 2px solid #9fb8d9;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    font-weight: bold;
    color: #2f4f4f;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    position: relative;
    perspective: 1000px;
}

.memory-card:hover {
    background-color: #9fb8d9;
    transform: scale(1.02);
}

.memory-card.flipped {
    background-color: #e6f3ff;
    border-color: #4a90e2;
}

.memory-card.matched {
    background-color: #90ee90;
    border-color: #2e8b57;
    color: #2e8b57;
    cursor: default;
}

.memory-card.matched:hover {
    background-color: #90ee90;
    transform: none;
}

.memory-card .card-content {
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.memory-card.flipped .card-content,
.memory-card.matched .card-content {
    opacity: 1;
}

/* Game Stats */
.game-stats {
    display: flex;
    justify-content: space-around;
    width: 100%;
    max-width: 400px;
    margin: 20px 0;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-label {
    font-size: 1rem;
    color: #666;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2f4f4f;
}

/* Timer */
.timer {
    font-size: 1.8rem;
    font-weight: bold;
    color: #2f4f4f;
    margin: 20px 0;
    text-align: center;
}

/* New Game Button */
.new-game-button {
    background-color: #b0c4de;
    color: #2f4f4f;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-transform: uppercase;
    margin: 20px 0;
}

.new-game-button:hover {
    background-color: #9fb8d9;
}

/* Game Over Overlay */
.game-over-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.2);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.game-over-content {
    background-color: rgba(255, 255, 255, 0.85);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
}

.game-over-title {
    font-size: 3rem;
    color: #2e8b57;
    margin-bottom: 20px;
    font-weight: bold;
    text-transform: uppercase;
}

.game-over-stats {
    font-size: 1.2rem;
    color: #666;
    margin: 15px 0;
    line-height: 1.5;
}

.game-over-time {
    font-size: 1.5rem;
    color: #2f4f4f;
    font-weight: bold;
    margin: 20px 0;
}

.restart-button {
    background-color: #b0c4de;
    color: #2f4f4f;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-transform: uppercase;
}

.restart-button:hover {
    background-color: #9fb8d9;
}

/* Instructions */
#instructions {
    margin-top: 20px;
    text-align: center;
    color: #666;
    font-size: 1rem;
    max-width: 400px;
    line-height: 1.4;
}

/* Responsive Design */
@media screen and (max-width: 480px) {
    .memory-grid {
        grid-template-columns: repeat(4, 70px);
        grid-template-rows: repeat(4, 70px);
        gap: 8px;
    }

    .memory-card {
        width: 70px;
        height: 70px;
        font-size: 2rem;
    }

    .game-stats {
        flex-direction: column;
        gap: 10px;
    }

    .stat-item {
        flex-direction: row;
        justify-content: space-between;
        width: 200px;
    }
}

@media screen and (max-width: 380px) {
    .memory-grid {
        grid-template-columns: repeat(4, 60px);
        grid-template-rows: repeat(4, 60px);
        gap: 6px;
    }

    .memory-card {
        width: 60px;
        height: 60px;
        font-size: 1.8rem;
    }
}