/* ====== GLOBAL STYLE ====== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Poppins", sans-serif;
    background: radial-gradient(circle at top, #0a0a0a 0%, #1b1b1b 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow-x: hidden;
}

h1 {
    font-size: 2.5rem;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

p {
    font-size: 1.2rem;
    color: #ccc;
    margin-bottom: 30px;
}

/* ====== GAME GRID ====== */
.game-container {
    display: grid;
    grid-template-columns: repeat(4, 80px);
    grid-gap: 10px;
    justify-content: center;
}

.card {
    width: 80px;
    height: 80px;
    background-color: #222;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    cursor: pointer;
    transition: transform 0.3s, background-color 0.3s;
}

.card.flipped {
    background-color: #333;
    transform: rotateY(180deg);
}

.card.matched {
    background-color: #00ffcc;
    color: #000;
    cursor: default;
    transform: scale(1.1);
}

/* ====== RESPONSIVE ====== */
@media (max-width: 600px) {
    h1 {
        font-size: 1.8rem;
    }

    .game-container {
        grid-template-columns: repeat(4, 60px);
        grid-gap: 8px;
    }

    .card {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

/* ====== ANIMATED BG ====== */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #0f0f0f, #1f1f1f, #0f0f0f);
    background-size: 400% 400%;
    animation: gradient 10s ease infinite;
    z-index: -1;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

footer {
    margin-top: 40px;
    font-size: 0.9rem;
    color: #666;
}