@import url('https://fonts.googleapis.com/css2?family=Jersey+15&family=Pixelify+Sans:wght@400..700&display=swap');
body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #112;
    margin: 10px; /* Reduced margin for smaller screens */
    overflow: hidden;
    position: relative;
    font-size: 16px; /* Base font size */
    line-height: 1.5;
}

h1 {
    color: #eee;
    z-index: 10;
    position: relative;
    font-size: 3em; /* Default for larger screens */
    text-align: center;
    margin-bottom: 15px;
    font-family: "Jersey 15", sans-serif;
    font-weight: 400;
    font-style: normal;
}

.controls {
    margin-bottom: 20px;
    z-index: 10;
    position: relative;
    display: flex; /* Use flexbox for controls */
    flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
    justify-content: center; /* Center buttons */
    gap: 10px; /* Space between buttons */
    padding: 0 10px; /* Add some padding on sides */
    max-width: 100%; /* Ensure controls don't overflow */
}

button {
    padding: 8px 12px; /* Slightly smaller padding */
    font-size: 18px; /* Slightly smaller font size */
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: #007bff;
    color: white;
    transition: background-color 0.3s ease;
    flex-shrink: 0; /* Prevent buttons from shrinking too much */
    font-family: "Pixelify Sans", sans-serif;
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
}

button:hover {
    background-color: #0056b3;
}

button.tool-btn.active {
    background-color: #28a745;
}

button.tool-btn.active:hover {
    background-color: #218838;
}

#grid-container {
    display: grid;
    border: 1px solid #111;
    background-color: #223;
    z-index: 10;
    position: relative;
    /* Max width to ensure it doesn't get too big on very large screens */
    max-width: calc(100% - 20px); /* Leave some margin */
    box-sizing: border-box; /* Include padding and border in element's total width/height */
}

.cell {
    background-color: #223;
    border: 1px solid #334;
    box-sizing: border-box; /* Crucial for consistent cell sizing with borders */
}

.cell.alive {
    background-color: #eee;
}

/* Background Game of Life styles */
#background-grid-container {
    position: fixed; /* Use fixed so it covers the entire viewport even on scroll */
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: grid;
    background-color: transparent;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.bg-cell {
    opacity: 0.07; /* Even fainter */
    background-color: #112;
    border: none;
}

.bg-cell.alive {
    background-color: #445;
}


/* --- Media Queries for Responsiveness --- */

/* Small screens (e.g., phones in portrait) */
@media (max-width: 600px) {
    body {
        margin: 5px;
        font-size: 14px;
    }

    h1 {
        font-size: 1.5em;
        margin-bottom: 10px;
    }

    .controls {
        flex-direction: column; /* Stack buttons vertically */
        gap: 5px;
        padding: 0;
    }

    button {
        width: 100%; /* Make buttons full width */
        padding: 10px 15px;
        font-size: 16px;
    }

    #grid-container {
        max-width: calc(100vw - 10px); /* Tighter fit on mobile */
        max-height: calc(100vw - 10px); /* Keep it square */
    }
}

/* Medium screens (e.g., tablets) */
@media (min-width: 601px) and (max-width: 1024px) {
    h1 {
        font-size: 1.8em;
    }

    button {
        padding: 9px 14px;
        font-size: 15px;
    }

    #grid-container {
        max-width: 80vw;
        max-height: 80vh;
    }
}