/* ===================================
   Memory Card Game - Styles
   =================================== */

/* Game Container */
.game-container {
    max-width: 800px;
    margin: 0 auto;
}

/* Game Header */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1rem 1.5rem;
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.game-stats {
    display: flex;
    gap: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.game-controls {
    display: flex;
    gap: 0.75rem;
}

/* Difficulty Selection */
.difficulty-selector {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.difficulty-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--surface-color);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.difficulty-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.difficulty-btn.active {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

/* Game Board */
.game-board {
    display: grid;
    gap: 0.75rem;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    perspective: 1000px;
}

.game-board.easy {
    grid-template-columns: repeat(4, 1fr);
}

.game-board.medium {
    grid-template-columns: repeat(4, 1fr);
}

.game-board.hard {
    grid-template-columns: repeat(6, 1fr);
}

/* Card Styles */
.card {
    aspect-ratio: 1;
    position: relative;
    cursor: pointer;
    perspective: 1000px;
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.card-front {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    transform: rotateY(0deg);
    z-index: 2;
}

.card-back {
    background-color: #ffffff;
    color: #1e293b;
    border: 2px solid var(--primary-color);
    font-size: 3rem;
    transform: rotateY(180deg);
    z-index: 1;
}

.card.flipped .card-front {
    transform: rotateY(180deg);
    z-index: 1;
}

.card.flipped .card-back {
    transform: rotateY(0deg);
    z-index: 2;
}

.card.matched .card-back {
    box-shadow: 0 0 0 4px var(--success-color);
    border-color: var(--success-color);
}

.card:hover .card-front {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px) rotateY(0deg);
}

.card.flipped:hover .card-front {
    transform: rotateY(180deg);
}

/* Game Over Modal */
.game-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.game-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    max-width: 400px;
    width: 90%;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.game-modal.active .modal-content {
    transform: scale(1);
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.modal-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.modal-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: var(--radius-md);
}

.modal-stat {
    text-align: center;
}

.modal-stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    display: block;
}

.modal-stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.modal-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* High Scores */
.high-scores {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
}

.high-scores h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.scores-list {
    list-style: none;
}

.scores-list li {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.scores-list li:last-child {
    border-bottom: none;
}

.score-rank {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 24px;
}

.score-details {
    color: var(--text-secondary);
}

.no-scores {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    padding: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .game-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .game-stats {
        width: 100%;
        justify-content: space-around;
    }
    
    .difficulty-selector {
        flex-wrap: wrap;
    }
    
    .difficulty-btn {
        flex: 1;
        min-width: 100px;
    }
    
    .game-board.hard {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .card-front,
    .card-back {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .game-board {
        padding: 1rem;
        gap: 0.5rem;
    }
    
    .card-front,
    .card-back {
        font-size: 1.25rem;
    }
    
    .stat-value {
        font-size: 1.25rem;
    }
    
    .modal-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}