Responsive layout UI | HTML, CSS & JavaScript

<div class="gallery-container">
        <div class="column" style="--bg-color: #ff6b6b;">
            <div class="content">
                <h2>01</h2>
                <h3>Design</h3>
                <p>Crafting beautiful, intuitive digital experiences.</p>
            </div>
        </div>
        <div class="column" style="--bg-color: #4ecdc4;">
            <div class="content">
                <h2>02</h2>
                <h3>Develop</h3>
                <p>Building fast, responsive, and scalable code.</p>
            </div>
        </div>
        <div class="column" style="--bg-color: #45b7d1;">
            <div class="content">
                <h2>03</h2>
                <h3>Deploy</h3>
                <p>Launching projects smoothly to the cloud.</p>
            </div>
        </div>
        <div class="column" style="--bg-color: #96ceb4;">
            <div class="content">
                <h2>04</h2>
                <h3>Deliver</h3>
                <p>Ensuring top-tier quality and client satisfaction.</p>
            </div>
        </div>
    </div>

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #1a1a1a;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Container holding the columns */
.gallery-container {
    display: flex;
    flex-wrap: wrap; 
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* Individual Column Base Styles */
.column {
    background-color: var(--bg-color);
    position: relative;
    display: flex;
    align-items: flex-end;
    padding: 30px;
    cursor: pointer;
    /* Transition flex-grow for layout, and filter for brightness */
    transition: flex-grow 0.5s cubic-bezier(0.25, 1, 0.5, 1), 
                flex-basis 0.5s cubic-bezier(0.25, 1, 0.5, 1), 
                height 0.5s cubic-bezier(0.25, 1, 0.5, 1),
                filter 0.3s ease;
}

.content {
    color: #ffffff;
}

.content h2 { font-size: 3rem; opacity: 0.3; margin-bottom: 5px; }
.content h3 { font-size: 1.5rem; margin-bottom: 5px; }
.content p { font-size: 0.9rem; opacity: 0.8; line-height: 1.4; }

/* ==========================================================================
   1. DESKTOP RESOLUTION (4 Columns Side-by-Side)
   ========================================================================= */
@media (min-width: 1025px) {

.column {
        flex-grow: 1;
        flex-basis: 0;
        height: 100%;
    }

.gallery-container:hover .column:hover {
        flex-grow: 2;
    }

.gallery-container:hover .column:not(:hover) {
        flex-grow: 0.6;
        filter: brightness(0.6);
    }

}

/* ==========================================================================
   2. TABLET RESOLUTION (2x2 Grid Layout) - THE FIX
   ========================================================================= */
@media (max-width: 1024px) and (min-width: 481px) {
    .column {
        /* Force exactly 2 columns per row using flex-basis */
        flex-basis: 50%; 
        flex-grow: 1;
        height: 50%; /* Two rows = 50% height each */
    }

/* When hovering a column in the 2x2 grid */
    .gallery-container:hover .column:hover {
        flex-basis: 65%; /* Grows horizontally within its row */
    }

.gallery-container:hover .column:not(:hover) {
        flex-basis: 35%; /* Shrinks its partner in the same row */
        filter: brightness(0.6);
    }
}

/* ==========================================================================
   3. MOBILE RESOLUTION (1 Column Stacked)
   ========================================================================= */
@media (max-width: 480px) {
    .column {
        flex-basis: 100%; /* Takes up full width */
        height: 25%;      /* 4 stacked columns = 25% height each */
    }

/* For mobile, we animate height instead of width */
    .gallery-container:hover .column:hover {
        height: 40%;
    }

.gallery-container:hover .column:not(:hover) {
        height: 20%;
        filter: brightness(0.6);
    }
}

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