@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&family=Rajdhani:wght@400;600;700&display=swap');

:root {
    --primary: #00d2ff;
    --accent: #9333ea;
    --bg: #020617;
    --card-back: #1e293b;
    --glass: rgba(15, 23, 42, 0.7);
}

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

body {
    background-color: var(--bg);
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(147, 51, 234, 0.05) 0%, transparent 40%);
    color: #fff;
    font-family: 'Rajdhani', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    overflow-x: hidden;
}

/* UI Panels */
.header-panel {
    width: 100%;
    max-width: 1000px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background: var(--glass);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    color: var(--primary);
    text-shadow: 0 0 10px rgba(0, 210, 255, 0.5);
}

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

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

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

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Game Board */
.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    max-width: 1200px;
    perspective: 1000px;
}

/* Card Styles */
.card {
    width: 133px;
    height: 190px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

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

.card.matched {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.5) rotateY(180deg);
    transition: all 0.5s ease-out;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-front {
    background: var(--card-back);
    background-image: url('caraComun.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.card-back {
    background: #fff;
    transform: rotateY(180deg);
}

.spriteSheet {
    width: 64px;
    height: 64px;
    background: url('emoji.png');
    transform: scale(1.5);
}

/* Difficulty Selector Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(2, 6, 23, 0.9);
    backdrop-filter: blur(15px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    transition: opacity 0.5s;
}

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

.menu-card {
    background: var(--glass);
    padding: 3rem;
    border-radius: 30px;
    border: 1px solid rgba(0, 210, 255, 0.3);
    text-align: center;
    box-shadow: 0 0 50px rgba(0, 210, 255, 0.2);
}

.menu-card h2 {
    font-family: 'Orbitron', sans-serif;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.btn-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn {
    padding: 1rem 3rem;
    border: none;
    border-radius: 12px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.btn-primary {
    background: var(--primary);
    color: var(--bg);
}

.btn-primary:hover {
    box-shadow: 0 0 20px var(--primary);
    transform: scale(1.05);
}

/* Sound Toggle */
.sound-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--glass);
    border: 1px solid rgba(255, 255, 255, 0.2);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
}

/* Win Modal */
.win-modal {
    display: none;
}
.win-modal.show {
    display: flex;
}

/* Responsiveness */
@media (max-width: 768px) {
    .header-panel { flex-direction: column; gap: 1rem; text-align: center; }
    .card { width: 90px; height: 130px; }
    .spriteSheet { transform: scale(1); }
}