/* バナースライダー */
.bdc-bnr {
  --bdc-bnr-w: min(1200px, 86cqw); /* cqw = .bdc-bnr の幅基準 */
  --bdc-bnr-gap: 20px;
  container-type: inline-size;
  position: relative;
  margin: 0 auto 30px;
}

.bdc-bnr__track {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--bdc-bnr-gap);
  padding-inline: calc((100% - var(--bdc-bnr-w)) / 2);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
}

/* 左右にはみ出した前後のバナーをフェードアウト（中央バナーは不透明のまま） */
.bdc-bnr.is-ready .bdc-bnr__track {
  --bdc-bnr-fade: calc((100cqw - var(--bdc-bnr-w)) / 2);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 var(--bdc-bnr-fade), #000 calc(100% - var(--bdc-bnr-fade)), transparent);
  mask-image: linear-gradient(to right, transparent, #000 var(--bdc-bnr-fade), #000 calc(100% - var(--bdc-bnr-fade)), transparent);
}

/* マウスでつかんで送れることを示す */
@media (hover: hover) {
  .bdc-bnr.is-ready .bdc-bnr__track {
    cursor: grab;
  }
}

.bdc-bnr.is-dragging .bdc-bnr__track {
  scroll-snap-type: none;
  cursor: grabbing;
  user-select: none;
}

.bdc-bnr.is-dragging .bdc-bnr__link {
  cursor: grabbing;
}

.bdc-bnr__track::-webkit-scrollbar {
  display: none;
}

.bdc-bnr__slide {
  flex: 0 0 var(--bdc-bnr-w);
  scroll-snap-align: center;
  scroll-snap-stop: always;
}

.bdc-bnr__link {
  display: block;
  transition: opacity .3s;
}

.bdc-bnr__link:hover {
  opacity: .8;
}

.bdc-bnr__slide picture,
.bdc-bnr__img {
  display: block;
  width: 100%;
  height: auto;
}

/* 矢印（中央バナーの左右端に重ねる） */
.bdc-bnr__arrow {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 48px;
  height: 48px;
  padding: 0;
  background: rgba(255, 255, 255, .9);
  border: 0;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .2);
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition: background-color .2s;
}

.bdc-bnr__arrow:hover {
  background: #fff;
}

.bdc-bnr__arrow::before {
  content: "";
  position: absolute;
  inset: 0;
  width: 12px;
  height: 12px;
  margin: auto;
  border-top: 2px solid #333;
  border-right: 2px solid #333;
}

.bdc-bnr__arrow--prev {
  left: calc((100% - var(--bdc-bnr-w)) / 2);
}

.bdc-bnr__arrow--prev::before {
  transform: translateX(2px) rotate(-135deg);
}

.bdc-bnr__arrow--next {
  left: calc((100% + var(--bdc-bnr-w)) / 2);
}

.bdc-bnr__arrow--next::before {
  transform: translateX(-2px) rotate(45deg);
}

.bdc-bnr__arrow:focus {
  outline: none;
}

.bdc-bnr__arrow:focus-visible {
  outline: 2px solid #4a9b9c;
  outline-offset: 2px;
}

/* 1枚だけ・JS未実行時は矢印を出さない */
.bdc-bnr:not(.is-ready) .bdc-bnr__arrow {
  display: none;
}

/* スマホは1枚だけ表示（前後のバナーは見せない） */
@media (max-width: 767px) {
  .bdc-bnr {
    --bdc-bnr-w: 100cqw;
    --bdc-bnr-gap: 12px;
  }

  .bdc-bnr.is-ready .bdc-bnr__track {
    -webkit-mask-image: none;
    mask-image: none;
  }

  .bdc-bnr__arrow {
    width: 32px;
    height: 32px;
    transform: translateY(-50%);
  }

  .bdc-bnr__arrow::before {
    width: 8px;
    height: 8px;
  }

  .bdc-bnr__arrow--prev {
    left: 6px;
  }

  .bdc-bnr__arrow--next {
    left: auto;
    right: 6px;
  }
}