:root {
    --bg-color: #1a2a33;
    --card-bg: #1f3641;
    --text-color: #f2b137;
    --accent-color: #31c3bd;
    --shadow-color: #10212a;
    --incorrect-color: #db4455;
    --correct-color: #32c44a;
}

body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
    padding: 1rem;
    box-sizing: border-box;
}

#game-container {
    width: 100%;
    max-width: 600px;
}

header h1 {
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 2px;
}

header p {
    color: var(--accent-color);
    font-size: 1rem;
    margin-bottom: 2rem;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 2rem;
}

.card {
    aspect-ratio: 1 / 1;
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 4px 0 var(--shadow-color);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 0 var(--shadow-color);
}

.card img {
    width: 80%;
    height: 80%;
    object-fit: contain;
    pointer-events: none; /* Prevents clicks on the image instead of the card */
}

.card.correct {
    background-color: var(--correct-color);
    border: 3px solid white;
    animation: bounce 0.5s;
}

.card.incorrect {
    background-color: var(--incorrect-color);
    border: 3px solid white;
    animation: shake 0.5s;
}

#restart-button {
    background-color: var(--text-color);
    color: var(--shadow-color);
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    border-radius: 10px;
    box-shadow: 0 4px 0 #b17e28;
    cursor: pointer;
    transition: all 0.2s;
}

#restart-button:hover {
    background-color: #ffc75f;
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #b17e28;
}

#restart-button:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #b17e28;
}

#message-area {
    margin-top: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
    height: 30px;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}


@media (min-width: 600px) {
    #game-board {
        grid-template-columns: repeat(5, 1fr);
        gap: 15px;
    }
}