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

body {
    font-family: Arial, sans-serif;
}

/* Fixed top navigation */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #333;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.top-nav .title {
    font-size: 1.5em;
}

.top-nav .nav-buttons {
    display: flex;
    gap: 10px;
}

.top-nav .nav-buttons button {
    padding: 10px 15px;
    background-color: #555;
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.top-nav .nav-buttons button:hover {
    background-color: #777;
}

/* Hidden on browser and visible on mobile */
.hamburger {
    display: none;
    cursor: pointer;
    font-size: 24px;
    color: white;
}

/* Grid layout */
.container {
    margin-top: 80px; /* Space to prevent content from overlapping with the fixed nav */
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 20px;
    padding: 20px;
}

/* First row: One div spanning 4 columns */
.row-1 {
    grid-column: span 4;
    background-color: #f4f4f4;
    padding: 20px;
    text-align: center;
    border: 1px solid #ccc;
}

/* Second row: Two divs spanning 2 columns each */
.row-2-1, .row-2-2 {
    grid-column: span 2;
    background-color: #eaeaea;
    padding: 20px;
    text-align: center;
    border: 1px solid #ccc;
}

/* Third row: Four divs, one per column */
.row-4 {
    background-color: #ddd;
    padding: 20px;
    text-align: center;
    border: 1px solid #ccc;
}

/* Footer row spanning 4 columns */
.footer {
    grid-column: span 4;
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
    border: 1px solid #000;
}
/* Mobile View */
@media (max-width: 568px) {
    .container {
        grid-template-columns: repeat(2, 1fr); /* 2 columns on mobile */
    }

    /* First row: Full width on mobile */
    .row-1 {
        grid-column: span 2;
    }

    /* Second row: Two divs each take full width */
    .row-2-1, .row-2-2 {
        grid-column: span 2;
    }

    /* Third row: Divs take full width */
    .row-3 {
        grid-column: span 2;
    }

    /* Footer full width */
    .footer {
        grid-column: span 2;
    }

    .top-nav {
        flex-direction: row;
    }

    .nav-buttons {
        display: none;
        flex-direction: column;
        background-color: #333;
        position: absolute;
        top: 60px;
        right: 0;
        width: 100%;
        z-index: 999; /* Ensure nav is above content */
        border: 1px solid #555;
    }

    .hamburger {
        display: block;
    }

    .nav-buttons button {
        padding: 15px 20px;
        border-bottom: 1px solid #444;
        width: 100%;
        text-align: left;
    }

    .nav-buttons.active {
        display: flex;
    }
}