/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', Arial, sans-serif;
}

body {
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab); /* Fallback for browsers that do not support animations */
    background-size: 200% 200%; /* Ensures the animation smoothly cycles */
    animation: gradient-animation 15s ease infinite; /* Animation for background gradient */
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
}

h1 {
    color: #00ff95;
    font-size: 3rem;
    margin-bottom: 20px;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.game-container {
    background-color: #ffffff;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 90%;
    max-width: 900px;
}

p {
    font-size: 1rem;
    margin: 10px 0;
}

#game-board {
    display: grid;
    gap: 5px; /* Small gap between tiles */
    margin: 20px auto;
    justify-content: center;
    align-items: center;
    width: 100%; /* Ensure the grid fits the container */
}

/* Dynamically adjust grid sizes based on screen resolution */
#game-board[data-grid="4x4"] {
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: calc((90vmin - 40px) / 4); /* Keep tiles square and responsive */
    max-width: 80vmin; /* Restrict the width to fit within the screen */
}

#game-board[data-grid="6x6"] {
    grid-template-columns: repeat(6, 1fr);
    grid-auto-rows: calc((90vmin - 60px) / 6); /* Adjust dynamically for 6x6 grid */
    max-width: 80vmin; /* Restrict the width to fit within the screen */
}

/* Card Styling */
.card {
    position: relative;
    width: 100%;
    aspect-ratio: 1; /* Ensures tiles are square */
    border-radius: 12px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

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

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    backface-visibility: hidden;
}

.card-front {
    background: linear-gradient(to bottom right, #ff9a9e, #fad0c4);
    display: flex;
    justify-content: center;
    align-items: center;
}

.card-back {
    background-size: cover;
    background-position: center;
    transform: rotateY(180deg);
}

select {
    width: 200px;
    padding: 10px;
    margin: 10px 0;
    border-radius: 8px;
    border: 2px solid #ff6f61;
    background-color: #fefefe;
    font-size: 1.1rem;
    font-weight: 500;
    color: #333;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

select:focus {
    border-color: #ff4b47;
    box-shadow: 0 0 5px rgba(255, 107, 100, 0.8);
}

option {
    font-size: 1rem;
    color: #333;
    background-color: #fff;
}


/* Button Styling */
button {
    background-color: #ff6f61;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
    background-color: #ff4b47;
    transform: scale(1.05);
}

/* Timer and Moves Counter */
#move-counter, #time-counter {
    font-weight: bold;
    font-size: 1.1rem;
    color: #ff6f61;
}

strong {
    color: #ff4b47;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    p {
        font-size: 1rem;
    }

    #game-board {
        gap: 5px;
    }

    button {
        font-size: 1rem;
        padding: 8px 16px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    p {
        font-size: 0.9rem;
    }

    button {
        font-size: 0.9rem;
        padding: 6px 12px;
    }
}

/* Animation for Background Gradient */
@keyframes gradient-animation {
    0% {
        background-position: 0% 50%;
    }
    25% {
        background-position: 50% 100%;
    }
    50% {
        background-position: 100% 50%;
    }
    75% {
        background-position: 50% 0%;
    }
    100% {
        background-position: 0% 50%;
    }
}