/* トップページの YouTube 欄（2026-10-16 MPH。inc/youtube-feed.php の leap_youtube_section()）
   通常の動画の最新3本を3カラム（スマホは1列）。余白・ボタンは旧 Instagram 欄（custom.css の .cu-instagram）と同じ */
.cu-youtube {
    padding-block: 40px 52.5px;
}
.cu-youtube__list {
    list-style: none;
    margin: 32px 0 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}
.cu-youtube__item {
    margin: 0;
    min-width: 0;
}
.cu-youtube__player {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 6px;
    background: #000;
}
.cu-youtube__player iframe,
.cu-youtube__thumb {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
.cu-youtube__thumb {
    display: block;
    padding: 0;
    margin: 0;
    background: #000;
    cursor: pointer;
}
.cu-youtube__thumb img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;          /* hqdefault（4:3）の上下の黒帯を切る */
    transition: transform 0.3s ease;
}
.cu-youtube__thumb:hover img,
.cu-youtube__thumb:focus-visible img {
    transform: scale(1.03);
}
/* 再生の印（YouTube の赤い角丸に白い三角） */
.cu-youtube__play {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 60px;
    height: 42px;
    margin: -21px 0 0 -30px;
    border-radius: 12px;
    background: rgba(255, 0, 0, 0.9);
}
.cu-youtube__play::after {
    content: '';
    position: absolute;
    left: 24px;
    top: 12px;
    border-style: solid;
    border-width: 9px 0 9px 16px;
    border-color: transparent transparent transparent #fff;
}
.cu-youtube__title {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
    margin-top: 10px;
    font-size: 14px;
    line-height: 1.6;
    text-align: left;
    color: #333;
    text-decoration: none;
}
.cu-youtube__title:hover {
    text-decoration: underline;
}
.cu-youtube__button-wrapper {
    text-align: center;
    margin-top: 32px;
}
.cu-youtube__button {
    display: inline-block;
    background: #50b3b0;
    color: #fff;
    text-align: center;
    padding: 16px 48px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: background 0.3s ease;
}
.cu-youtube__button:hover {
    background: #3d8f8d;
    color: #fff;
}

@media screen and (min-width: 768px) {
    .cu-youtube {
        padding-block: 80px 92.5px;
    }
    .cu-youtube__list {
        margin-top: 48px;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .cu-youtube__button-wrapper {
        margin-top: 48px;
    }
    .cu-youtube__button {
        font-size: 18px;
        padding: 18px 64px;
    }
}