:root {
    --bg-color: #964330;
    --card-bg: #FFFFFF;
    --card-hover: #F8FAFC;
    --accent-color: #FFFFFF;
    --accent-gradient: linear-gradient(135deg, #FFFFFF 0%, #E2E8F0 100%);
    --text-primary: #FFFFFF;
    --text-secondary: #E2E8F0;
    --text-inverse: #964330;
    --modal-bg: rgba(150, 67, 48, 0.95);
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: -webkit-fill-available;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

header {
    width: 100%;
    max-width: 800px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 10px;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(150, 67, 48, 0.2);
}

.stats-container {
    display: flex;
    align-items: center;
    gap: 20px;
}

.stat-box {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.restart-btn {
    background: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.restart-btn:hover {
    background: var(--accent-color);
    color: var(--bg-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(150, 67, 48, 0.3);
}

.game-container {
    width: 100%;
    max-width: 800px;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.game-board {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 15px;
    perspective: 1000px;
}

.card {
    aspect-ratio: 3/4;
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    /* Esencial para efecto 3D */
    transform: scale(1);
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
    border-radius: var(--border-radius);
    -webkit-tap-highlight-color: transparent;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

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

.card.matched {
    transform: rotateY(180deg) scale(0.95);
    cursor: default;
    opacity: 0.7;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    /* Oculta la cara de atrás */
    -webkit-backface-visibility: hidden;
    border-radius: var(--border-radius);
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-front {
    background-color: var(--card-bg);
    border: 2px solid rgba(150, 67, 48, 0.1);
    transform: rotateY(0deg);
    background-image:
        radial-gradient(circle at 50% 50%, rgba(150, 67, 48, 0.05) 0%, transparent 50%),
        linear-gradient(45deg, transparent 48%, rgba(150, 67, 48, 0.05) 50%, transparent 52%);
}

.card-front::after {
    content: '?';
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-inverse);
    opacity: 0.3;
}

.card-back {
    background-color: var(--card-bg);
    transform: rotateY(180deg);
    border: 2px solid var(--accent-color);
}

.card-back {
    background-color: var(--card-bg);
    transform: rotateY(180deg);
    border: 2px solid var(--accent-color);
    /* Fondo radial sutil para resaltar el emoji */
    background: radial-gradient(circle at center, rgba(150, 67, 48, 0.05) 0%, #FFFFFF 70%);
}

.card-emoji {
    font-size: 4rem;
    filter: drop-shadow(0 0 10px rgba(150, 67, 48, 0.3));
    animation: pulse 2s infinite ease-in-out;
    user-select: none;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        filter: drop-shadow(0 0 10px rgba(150, 67, 48, 0.3));
    }

    50% {
        transform: scale(1.1);
        filter: drop-shadow(0 0 20px rgba(150, 67, 48, 0.5));
    }

    100% {
        transform: scale(1);
        filter: drop-shadow(0 0 10px rgba(150, 67, 48, 0.3));
    }
}

.card-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-bg);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

.modal-content {
    background-color: #FFFFFF;
    border: 1px solid rgba(150, 67, 48, 0.1);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    max-width: 90%;
    width: 400px;
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal.hidden .modal-content {
    transform: scale(0.9);
}

.modal-content h2 {
    background: none;
    -webkit-background-clip: border-box;
    background-clip: border-box;
    -webkit-text-fill-color: #333333;
    color: #333333;
    font-weight: 800;
    text-shadow: none;
}

.modal-content p {
    font-size: 1.2rem;
    font-weight: 500;
    color: #555555;
    margin-bottom: 25px;
}

.primary-btn {
    background: var(--text-inverse);
    border: none;
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(150, 67, 48, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(150, 67, 48, 0.4);
}

@media (max-width: 600px) {
    .game-board {
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
    }

    header {
        flex-direction: column;
        gap: 15px;
    }

    h1 {
        font-size: 1.5rem;
    }
}