/* ===== 3D Ring Carousel ===== */

body.home .ring-hero {
  position: relative;
  padding: 0 0 clamp(18px, 2.8vw, 36px);
  overflow: visible;
}

/* =========================
   Carousel
========================= */

body.home .ring-carousel {
  --angle: 0deg;
  --radius: clamp(330px, 28vw, 410px);
  --card-width: clamp(300px, 25vw, 400px);
  --card-opacity-factor: 1;
  --side-tilt: 0deg;

  position: relative;
  z-index: 1;
  width: min(1240px, calc(100% - 32px));
  height: clamp(470px, 39vw, 620px);
  min-height: 0;
  margin: 0 auto 0;

  perspective: 1500px;
  overflow: visible;
  touch-action: pan-y;
  user-select: none;
  transform-style: preserve-3d;
}

/* =========================
   Slides
========================= */

body.home .ring-slide {
  --slot-angle: 0deg;
  --face-angle: 0deg;
  --depth-opacity: 1;
  --depth-scale: 1;
  --depth-blur: 0px;
  --depth-y: 0px;
  --side-tilt: 0deg;
  --side-gap: 0px;

  position: absolute;
  top: 50%;
  left: 50%;

  display: block;
  width: var(--card-width);
  aspect-ratio: 1;
  box-sizing: border-box;

  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;

  opacity: var(--depth-opacity);
  filter:
    blur(var(--depth-blur))
    saturate(calc(0.84 + var(--depth-opacity) * 0.16));

  transform:
    translate(-50%, -50%)
    translateX(var(--side-gap))
    translateY(var(--depth-y))
    rotateY(calc(var(--slot-angle) + var(--angle)))
    translateZ(var(--radius))
    rotateY(var(--face-angle))
    rotateY(var(--side-tilt))
    scale(var(--depth-scale));

  transform-style: preserve-3d;

  transition:
    transform 0.78s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.78s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.78s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 初回表示だけ配置補正の回転を止める。JS側の is-initializing を外すと通常動作に戻る。 */
body.home .ring-carousel.is-initializing .ring-slide {
  transition: none !important;
}

body.home .ring-carousel.is-dot-fast-rotating .ring-slide {
  transition:
    transform 0.78s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.78s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.78s cubic-bezier(0.22, 1, 0.36, 1);
}

body.home .ring-slide img {
  display: block;
  width: 88%;
  height: 86%;
  margin: 5% auto 9%;

  object-fit: contain;
  object-position: center;

  pointer-events: none;
  backface-visibility: hidden;
}

body.home .ring-slide::after {
  content: "";
  position: absolute;
  right: 12%;
  bottom: -9px;
  left: 12%;

  height: 10px;
  border-radius: 50%;

  background: rgba(7, 28, 68, 0.075);
  filter: blur(7px);
  transform: scaleX(0.72);
  pointer-events: none;
}

body.home .ring-slide.is-active {
  z-index: 10;
}

/* =========================
   Navigation
========================= */

body.home .ring-nav {
  position: absolute;
  top: 50%;
  z-index: 2147483646;

  width: 46px;
  height: 46px;

  border: 1px solid rgba(7, 28, 68, 0.16);
  border-radius: 50%;

  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 14px 34px rgba(7, 28, 68, 0.16);

  cursor: pointer;
  pointer-events: auto;
  transform: translateY(-50%);
}

body.home .ring-nav::before {
  content: "";
  position: absolute;
  inset: 0;

  width: 10px;
  height: 10px;
  margin: auto;

  border-top: 2px solid #071c44;
  border-left: 2px solid #071c44;
}

body.home .ring-prev {
  left: clamp(-4px, 1.2vw, 16px);
}

body.home .ring-prev::before {
  transform: translateX(2px) rotate(-45deg);
}

body.home .ring-next {
  right: clamp(-4px, 1.2vw, 16px);
}

body.home .ring-next::before {
  transform: translateX(-2px) rotate(135deg);
}

@media (min-width: 1280px) {
  body.home .ring-prev {
    left: clamp(-42px, -2.4vw, -24px);
  }

  body.home .ring-next {
    right: clamp(-42px, -2.4vw, -24px);
  }
}

@media (min-width: 721px) and (max-width: 1000px) {
  body.home .ring-hero {
    padding-top: 0;
  }

  body.home .ring-carousel {
    --radius: clamp(198px, 26vw, 260px);
    --card-width: clamp(274px, 33vw, 310px);
    height: calc(var(--card-width) + 58px);
    min-height: 0;
  }

  body.home .ring-slide.is-neighbor {
    --depth-scale: 0.84;
  }

  body.home .ring-slide.is-left-neighbor {
    --side-gap: clamp(-28px, -3vw, -16px);
  }

  body.home .ring-slide.is-right-neighbor {
    --side-gap: clamp(16px, 3vw, 28px);
  }
}

/* =========================
   Mobile
========================= */

@media (max-width: 720px) {
  body.home .ring-hero {
    padding: 0 0 18px;
    overflow: hidden;
  }

  body.home .ring-carousel {
    --card-width: clamp(232px, 70vw, 280px);
    --radius: clamp(150px, 45vw, 190px);

    width: 100%;
    height: calc(var(--card-width) + 70px);
    min-height: 0;
    margin: 0 auto;

    perspective: 1400px;
    overflow: hidden;
  }

  body.home .ring-slide {
    opacity: calc(0.2 + var(--depth-opacity) * 0.62);
    filter:
      blur(var(--depth-blur))
      saturate(calc(0.86 + var(--depth-opacity) * 0.14));
  }

  body.home .ring-slide img {
    width: 92%;
    height: 87%;
    margin: 4.5% auto 8.5%;
  }

  body.home .ring-slide::after {
    right: 18%;
    bottom: -7px;
    left: 18%;

    height: 8px;
    background: rgba(7, 28, 68, 0.06);
    filter: blur(6px);
  }

  body.home .ring-slide.is-active {
    opacity: 1;
  }

  body.home .ring-slide.is-neighbor {
    --depth-scale: 0.9;
    opacity: 0.9;
  }

  body.home .ring-slide.is-left-neighbor {
    --side-gap: clamp(-18px, -4vw, -10px);
  }

  body.home .ring-slide.is-right-neighbor {
    --side-gap: clamp(10px, 4vw, 18px);
  }

  body.home .ring-slide.is-distant {
    opacity: 0.08;
    pointer-events: none;
  }

  body.home .ring-nav {
    z-index: 2147483646;
    width: 36px;
    height: 36px;
    opacity: 0.72;
    touch-action: manipulation;
  }

  body.home .ring-prev {
    left: clamp(8px, 2.5vw, 12px);
  }

  body.home .ring-next {
    right: clamp(8px, 2.5vw, 12px);
  }

  body.home .ring-hero + .btn-top {
    margin-top: 14px;
  }
}

body.home .ring-dots {
  position: absolute;
  top: calc(50% + (var(--card-width) / 2) + clamp(58px, 4.4vw, 76px));
  bottom: auto;
  left: 50%;
  z-index: 2147483647;

  display: flex;
  align-items: center;
  gap: 8px;

  pointer-events: auto;
  isolation: isolate;
  transform: translateX(-50%);
}

body.home .ring-dot {
  width: 8px;
  height: 8px;
  padding: 0;

  border: 0;
  border-radius: 999px;

  background: rgba(7, 28, 68, 0.25);
  cursor: pointer;
  pointer-events: auto;

  transition:
    width 0.25s ease,
    background-color 0.25s ease,
    transform 0.25s ease;
}

body.home .ring-dot:hover {
  background: rgba(7, 28, 68, 0.5);
  transform: scale(1.15);
}

body.home .ring-dot.is-active {
  width: 24px;
  background: #0d3b91;
}

body.home .ring-dot:focus-visible {
  outline: 2px solid #f5b719;
  outline-offset: 3px;
}

@media (max-width: 720px) {
  body.home .ring-dots {
    top: calc(50% + (var(--card-width) / 2) + 28px);
    bottom: auto;
    gap: 7px;
  }

  body.home .ring-dot {
    width: 7px;
    height: 7px;
  }

  body.home .ring-dot.is-active {
    width: 20px;
  }
}