body {
    background-color: rgb(252, 247, 239);
    font-family: Times, serif;
    margin: 0;
    padding: 0;
}

.ctn_center {
    text-align: center;
}

header {
    text-align: center;
}

header #circle_logo {
    max-width: 100%;
}

header nav {
    padding: 0 20px;
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

header a {
    text-decoration: none;
    color: #333;
    font-size: 24px;
    padding: 10px 20px;
    border-radius: 5px;
    transition: background-color 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

header a:hover {
    background-color: rgb(181, 213, 211);
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

main .popup {
    box-sizing: border-box;
    width: min(800px, 90vw);
    max-width: 90vw;
    max-height: 90vh;
    margin: auto;
    padding: 0;
    border: none;
    border-radius: 16px;
    background: white;
    color: #333;
    overflow: auto;
}

main .popup::backdrop {
    background: rgba(0, 0, 0, 0.6);
}

main .popup_content {
    padding: 20px;
    text-align: center;
}

main .popup_content img {
    max-width: 100%;
    border-radius: 12px;
}

main .popup_close {
    padding: 8px 16px;
    background-color: rgb(213, 238, 235);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
}

main h2 {
    margin-bottom: 4px;
}

main .works-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
}

main .works-list > li {
    padding: 4px;
}

main .work-button {
    display: block;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
}

main .work-button .work-thumbnail {
    display: block;
    border-radius: 12px;
}

main .work-button:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
}

main .work-button:focus-visible .work-thumbnail {
    transform: scale(1.2);
}

main .work-thumbnail {
    transition: transform 300ms ease-in-out;
}
main .work-thumbnail:hover {
    transform: scale(1.2);
}

main .gallery-button {
    display: block;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
}

main .gallery-button .gallery-thumbnail {
    display: block;
    border-radius: 12px;
}

main .gallery-button:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
}

main .gallery-button:focus-visible .gallery-thumbnail {
    transform: scale(1.2);
}

main .gallery-thumbnail {
    transition: transform 300ms ease-in-out;
}

main .gallery-thumbnail:hover {
    transform: scale(1.2);
}

footer {
    text-align: center;
    padding: 20px;
}

@media screen and (max-width: 679px) {
    header nav {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    main {
        padding: 10px;
    }
}