/* 商品動画ギャラリー共通。既存のSlickとページの幅を利用する。 */
#mainHead #mainSlide .sdn-gallery-has-video { position: relative; }
#mainHead #mainSlide .sdn-gallery-video-preview {
    position: relative;
    display: block;
    width: 100%;
    aspect-ratio: 1 / 1;
    padding: 0;
    border: 0;
    background: #fff;
    color: #444;
    cursor: pointer;
    font: inherit;
}
#mainHead #mainSlide .sdn-gallery-video-preview img {
    display: block;
    width: 100%;
    height: 100%;
    aspect-ratio: 1 / 1;
    object-fit: contain;
}
#mainHead .sdn-gallery-shortcut,
#mainHead .sdn-gallery-play-label {
    position: absolute;
    left: 50%;
    bottom: 4%;
    transform: translateX(-50%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .25em;
    min-height: 44px;
    padding: 8px 22px;
    border: 1px solid #e2e2e2;
    border-radius: 40px;
    background: rgba(255, 255, 255, .94);
    box-shadow: 0 3px 14px rgba(0, 0, 0, .1);
    color: #444;
    font: bold clamp(14px, 2.7vw, 18px)/1.4 sans-serif;
    white-space: nowrap;
    box-sizing: border-box;
}
/* 高さ44pxのボタンの上約3分の1（15px）を画像下端に重ねる。 */
#mainHead #mainSlide { display: flow-root; }
#mainHead .sdn-gallery-shortcut {
    position: relative;
    left: auto;
    bottom: auto;
    transform: none;
    display: flex;
    width: max-content;
    max-width: 100%;
    margin: -15px auto 12px;
    z-index: 1;
    cursor: pointer;
}
/* 動画表紙も画像直下の共通ボタンを使うため、表紙内の表示ラベルは隠す。 */
#mainHead #mainSlide .sdn-gallery-video-preview .sdn-gallery-play-label { display: none; }
/* ▶文字は端末によって絵文字になるため、表示せずCSSの三角形を使う。 */
#mainHead .sdn-gallery-shortcut > span[aria-hidden="true"],
#mainHead .sdn-gallery-play-label > span[aria-hidden="true"] {
    position: relative;
    display: inline-block;
    flex: 0 0 12px;
    width: 12px;
    height: 14px;
    font-size: 0;
    line-height: 0;
}
#mainHead .sdn-gallery-shortcut > span[aria-hidden="true"]::before,
#mainHead .sdn-gallery-play-label > span[aria-hidden="true"]::before {
    position: absolute;
    top: 1px;
    left: 1px;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 10px solid currentColor;
    content: '';
}
/* 追加した動画のドットだけ再生マークにする。既存ドットの配置・寸法は維持。 */
#mainHead .slick-dots button.sdn-gallery-video-dot::before {
    top: 6px;
    left: 7px;
    width: 0;
    height: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 6px solid #555;
    content: '';
}
#mainHead button:focus-visible,
.sdn-video-dialog button:focus-visible,
.sdn-video-dialog video:focus-visible {
    outline: 3px solid #3276b1;
    outline-offset: 2px;
}
.sdn-video-dialog {
    position: fixed;
    inset: 0;
    width: min(480px, 90vw, calc((100vh - 110px) * .5625));
    width: min(480px, 90vw, calc((100dvh - 110px) * .5625));
    max-width: none;
    max-height: none;
    margin: auto;
    padding: 0;
    overflow: visible;
    border: 0;
    background: transparent;
    color: #fff;
}
.sdn-video-dialog:not([open]) { display: none; }
.sdn-video-dialog::backdrop { background: rgba(0, 0, 0, .6); }
.sdn-video-dialog video {
    display: block;
    width: 100%;
    height: auto;
    max-height: calc(100vh - 110px);
    max-height: calc(100dvh - 110px);
    background: #000;
    object-fit: contain;
}
.sdn-video-close {
    position: absolute;
    top: -52px;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: #fff;
    color: #666;
    font: 36px/1 sans-serif;
    cursor: pointer;
}
.sdn-video-status { margin: 8px 0 0; font: 14px/1.6 sans-serif; }
.sdn-video-status:empty { display: none; }
.sdn-video-dialog-fallback {
    z-index: 2147483647;
    height: fit-content;
    box-shadow: 0 0 0 100vmax rgba(0, 0, 0, .6);
}
/* 開くときだけ、動画と背景をゆっくり表示する。 */
.sdn-video-dialog[open] { animation: sdn-video-appear .3s ease-out both; }
.sdn-video-dialog[open]::backdrop { animation: sdn-backdrop-appear .3s ease-out both; }
@keyframes sdn-video-appear {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes sdn-backdrop-appear {
    from { opacity: 0; }
    to { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
    .sdn-video-dialog[open],
    .sdn-video-dialog[open]::backdrop { animation: none; }
}