.region-repo-related {
    --related-accent: #2d6a4f;
    --related-border: #dfe7e2;
    --related-muted: #667169;
    margin-top: 24px;
}

.region-repo-related__group {
    position: relative;
    margin-top: 24px;
}

.region-repo-related__heading {
    margin: 0 0 16px !important;
    font-size: 1.15em;
}

/* JavaScriptが使えない場合も、この横スクロールで全カードを利用できる。 */
.region-repo-related__slider {
    max-width: 100%;
    padding: 2px 2px 14px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-padding-inline: 2px;
    scroll-snap-type: x proximity;
    scrollbar-color: var(--related-border) transparent;
    scrollbar-width: thin;
}

.region-repo-related__slider.swiper-initialized {
    overflow: hidden;
}

.region-repo-related__list {
    align-items: stretch;
}

.region-repo-related__card {
    width: min(76vw, 280px);
    height: auto;
    flex: 0 0 min(76vw, 280px);
    border: 1px solid var(--related-border);
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 4px 14px rgba(31, 53, 42, 0.08);
    overflow: hidden;
    scroll-snap-align: start;
}

.region-repo-related__link {
    display: flex;
    height: 100%;
    flex-direction: column;
    color: inherit !important;
    text-decoration: none !important;
}

.region-repo-related__media {
    display: block;
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #eef2ef;
}

.region-repo-related__image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.25s ease;
}

.region-repo-related__image-placeholder {
    display: block;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(135deg, rgba(45, 106, 79, 0.08), rgba(45, 106, 79, 0.02)),
        #eef2ef;
}

.region-repo-related__image-placeholder::after {
    position: absolute;
    top: 50%;
    left: 50%;
    color: var(--related-muted);
    content: "画像なし";
    font-size: 0.78em;
    transform: translate(-50%, -50%);
}

.region-repo-related__title {
    display: block;
    padding: 14px 16px 16px;
    font-size: 0.95em;
    font-weight: 700;
    line-height: 1.65;
}

.region-repo-related__link:hover .region-repo-related__image,
.region-repo-related__link:focus-visible .region-repo-related__image {
    transform: scale(1.035);
}

.region-repo-related__link:hover .region-repo-related__title,
.region-repo-related__link:focus-visible .region-repo-related__title {
    color: var(--related-accent);
}

.region-repo-related__link:focus-visible {
    border-radius: 12px;
    outline: 3px solid rgba(45, 106, 79, 0.25);
    outline-offset: -3px;
}

.region-repo-related__controls {
    display: none;
}

@media screen and (min-width: 835px) {
    .region-repo-related__group--enhanced .region-repo-related__controls {
        display: flex;
        position: absolute;
        top: -6px;
        right: 0;
        gap: 8px;
    }

    .region-repo-related__button {
        display: inline-flex;
        width: 36px;
        height: 36px;
        align-items: center;
        justify-content: center;
        padding: 0;
        border: 1px solid var(--related-border);
        border-radius: 50%;
        background: #fff;
        color: var(--related-accent);
        cursor: pointer;
        font-size: 18px;
        line-height: 1;
    }

    .region-repo-related__button:hover,
    .region-repo-related__button:focus-visible {
        border-color: var(--related-accent);
        background: var(--related-accent);
        color: #fff;
    }

    .region-repo-related__button:focus-visible {
        outline: 3px solid rgba(45, 106, 79, 0.2);
        outline-offset: 2px;
    }

    .region-repo-related__button.swiper-button-disabled {
        opacity: 0.35;
        pointer-events: none;
    }

    .region-repo-related__button.swiper-button-lock {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .region-repo-related__image {
        transition: none;
    }
}