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

/* BODY + BACKGROUND */
body {
    font-family: Arial, sans-serif;
    color: #222;
    text-align: center;

    background-image: url("https://img.freepik.com/premium-vector/checkered-seamless-pattern-blue-pink-background-simple-geometric-contrast-repeating-pattern_539065-252.jpg");
    background-repeat: repeat;
    background-size: auto;
}

/* HEADER */
header {
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 1rem;
    margin-bottom: 2rem;
}

/* GALLERY — INSTAGRAM-STYLE GRID */
.gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;               /* tighter spacing */
    max-width: 600px;       /* keeps it centered + compact */
    margin: 0 auto;         /* center horizontally */
    padding: 12px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 12px;
}

/* IMAGE STYLING */
.img-container img {
    width: 100%;
    aspect-ratio: 1 / 1;    /* perfect squares */
    object-fit: cover;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.img-container img:hover {
    transform: scale(1.03);
    opacity: 0.9;
}

/* LIGHTBOX */
#lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    justify-content: center;
    align-items: center;
    z-index: 999;
}

#lightbox img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 8px;
}

/* FOOTER */
footer {
    margin-top: 2rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: 0.9rem;
}