:root {
    --primary-color: #E0E2DB;
    --secondary-color: #889696;
    --accent-color: #5F7470;
    --primary-text-color: #1F2F16;
     
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background-color: var(--primary-color);
    background-image:
        linear-gradient(
            rgba(185, 185, 180, 0.93),
            rgba(185, 185, 180, 0.93)
        ),
        url("../images/Earth_1_w.webp");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    color: var(--primary-text-color);
    font-family: "GFS Didot", serif;
}

header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 2rem;
    padding: 2.25rem 2rem;
    background-color: rgba(240, 236, 226, 0.78);
    border-bottom: 1px solid rgba(89, 110, 121, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 1.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

a {
    color: inherit;
    text-decoration: none;
}

nav a {
    position: relative;
    display: inline-block;
    font-size: 1rem;
    letter-spacing: 0.04em;
}

nav a::after,
.art-item figcaption::after {
    position: absolute;
    bottom: -0.35rem;
    left: 50%;
    width: 100%;
    height: 1px;
    background-color: currentColor;
    content: "";
    transform: translateX(-50%) scaleX(0);
    transform-origin: center;
    transition: transform 300ms ease;
}

nav a:hover::after,
nav a:focus-visible::after,
.image-container:hover + figcaption::after {
    transform: translateX(-50%) scaleX(1);
}

#gallery {
    padding: 3rem 2rem 5rem;
    border-top: 5px solid var(--secondary-color);
    border-bottom: 5px solid var(--secondary-color);
}

.art {
    display: grid;
    grid-template-columns: repeat(3, 320px);
    justify-content: center;
    gap: 2rem;
}

.art-item {
    margin: 0;
}

.image-container {
    border-radius: 4px;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.937);
    transition:
        transform 250ms ease,
        box-shadow 250ms ease;
    transform:
        perspective(800px) rotateX(var(--rotate-x, 0deg)) rotateY(var(--rotate-y, 0deg)) scale(var(--scale, 1));
    will-change: transform;
}

.image-container:hover {
    box-shadow: 0 26px 46px rgba(0, 0, 0, 0.65);
}

.art-item img {
    display: block;
    width: 100%;
    height: auto;
   
}

.art-item figcaption {
    position: relative;
    width: fit-content;
    margin: 0.75rem auto 0;
    color: var(--primary-text-color); 
    font-size: 1.2rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-align: center;
}

footer {
    padding: 2rem;
    color: var(--primary-text-color);
    text-align: center;
}

footer p {
    margin: 0;
    font-size: 0.9rem;
}

footer ul {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    margin: 1rem 0 0;
    padding: 0;
    list-style: none;
}

footer a {
    font-size: 0.9rem;
}

@media (max-width: 700px) {
    header {
        align-items: flex-start;
        flex-direction: column;
    }

    nav ul {
        justify-content: flex-start;
    }

    .art {
        grid-template-columns: 1fr;
    }
}