:root {
  --font-serif: "Noto Serif JP", "Yu Mincho", Georgia, serif;
  --font-sans: "Noto Sans JP", "Segoe UI", system-ui, sans-serif;

  --color-page-bg: #fff9e8;
  --color-rose: #c9788a;
  --color-rose-hover: #b5687a;
  --color-navy: #1a365d;
  --color-text-muted: #4a5f73;

  --card-w: 560px;
  --card-h: 230px;
  --ring-card-w: 420px;
  --ring-card-h: 220px;
  --stage-h-coverflow: 300px;
  --stage-h-ring: 320px;
  --cylinder-card-w: 420px;
  --cylinder-card-h: 220px;
  --stage-h-cylinder: 320px;
  --shadow-card: 0 4px 20px rgba(26, 54, 93, 0.07);
  --shadow-card-front: 0 8px 32px rgba(26, 54, 93, 0.11);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--color-page-bg);
  color: var(--color-navy);
  min-height: 100vh;
  line-height: 1.55;
  overflow-x: hidden;
}

/* Bloc page : titre puis carrousel (flux normal, pas de chevauchement) */
.page-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1rem 3.5rem;
}

.page-header {
  flex: 0 0 auto;
  width: 100%;
  text-align: center;
  padding-bottom: 3.5rem;
}

.page-eyebrow {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-rose);
  margin-bottom: 0.5rem;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-navy);
  margin-bottom: 0.5rem;
}

.page-lead {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 420px;
  margin: 0 auto;
}

.carousel-block {
  flex: 0 0 auto;
  width: 100%;
  margin-top: 1rem;
}

.carousel-block--ring {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(26, 54, 93, 0.1);
}

.carousel-block-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: center;
  color: var(--color-navy);
  margin-bottom: 1.25rem;
}

.stage-wrap {
  position: relative;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  overflow: visible;
}

.stage {
  position: relative;
  width: 100%;
  perspective-origin: 50% 50%;
  overflow: visible;
}

.stage--coverflow {
  height: var(--stage-h-coverflow, 300px);
  perspective: 1600px;
}

.stage--ring {
  height: var(--stage-h-ring, 320px);
  perspective: 1400px;
}

.stage--cylinder {
  height: var(--stage-h-cylinder, 320px);
  perspective: 1500px;
}

/* Coverflow */
.stage--coverflow .ring {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--card-w);
  height: var(--card-h);
  margin-left: calc(var(--card-w) / -2);
  margin-top: calc(var(--card-h) / -2);
  transform-style: preserve-3d;
}

/* Cercle 3D (billboard) et cylindre (dos sur le cercle) */
.stage--ring .ring--circle,
.stage--cylinder .ring--cylinder {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 0;
  height: 0;
  margin: 0;
  transform-style: preserve-3d;
}

.ring.no-transition {
  transition: none !important;
}

.ring.no-transition .frame {
  transition: none !important;
}

.stage--ring .frame {
  left: calc(var(--ring-card-w) / -2);
  top: calc(var(--ring-card-h) / -2);
  width: var(--ring-card-w);
  height: var(--ring-card-h);
  transition: transform 0.65s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.stage--ring .frame.is-front {
  transition:
    transform 0.65s cubic-bezier(0.25, 0.1, 0.25, 1),
    opacity 0.35s ease,
    box-shadow 0.35s ease;
}

.stage--ring .frame:not(.is-front) {
  opacity: 0.82;
}

.stage--cylinder .frame {
  left: calc(var(--cylinder-card-w) / -2);
  top: calc(var(--cylinder-card-h) / -2);
  width: var(--cylinder-card-w);
  height: var(--cylinder-card-h);
  transition:
    transform 0.65s cubic-bezier(0.25, 0.1, 0.25, 1),
    opacity 0.45s ease;
}

.stage--cylinder .frame.is-front {
  transition:
    transform 0.65s cubic-bezier(0.25, 0.1, 0.25, 1),
    opacity 0.45s ease,
    box-shadow 0.35s ease;
}

.stage--cylinder .frame.is-back {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

.stage--cylinder .frame.is-side {
  opacity: 0.55;
}

.stage--coverflow .frame {
  width: var(--card-w);
  height: var(--card-h);
}

.frame {
  position: absolute;
  left: 0;
  top: 0;
  transform-style: preserve-3d;
  transform-origin: center center;
  backface-visibility: hidden;
  border-radius: 0;
  background: #fff;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition:
    transform 0.65s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.45s ease,
    box-shadow 0.35s ease,
    visibility 0.45s ease;
}

.frame.is-front {
  opacity: 1;
  visibility: visible;
  box-shadow: var(--shadow-card-front);
  z-index: 3;
}

.frame.is-side-left,
.frame.is-side-right {
  opacity: 0.9;
  visibility: visible;
  z-index: 2;
}

.frame.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 1;
}

.frame-media {
  width: 100%;
  height: 100%;
  line-height: 0;
  background: #fff;
}

.frame-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  object-position: center;
}

.nav-btn {
  position: absolute;
  top: 50%;
  z-index: 10;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  padding: 0;
  border: none;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1;
  color: #fff;
  background: var(--color-rose);
  box-shadow: 0 4px 14px rgba(201, 120, 138, 0.4);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.3s ease,
    background 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.nav-prev {
  left: 0.25rem;
}

.nav-next {
  right: 0.25rem;
}

.stage-wrap:hover .nav-btn,
.stage-wrap:focus-within .nav-btn {
  opacity: 1;
  pointer-events: auto;
}

.nav-btn:hover {
  background: var(--color-rose-hover);
  transform: translateY(-50%) scale(1.05);
  box-shadow: 0 6px 18px rgba(201, 120, 138, 0.45);
}

.nav-btn:active {
  transform: translateY(-50%) scale(0.97);
}

.nav-btn:focus-visible {
  outline: 2px solid var(--color-navy);
  outline-offset: 3px;
}

@media (hover: none) {
  .nav-btn {
    opacity: 0.85;
    pointer-events: auto;
  }
}

@media (max-width: 560px) {
  .page-shell {
    padding: 1.5rem 0.75rem 2.5rem;
  }

  .page-header {
    padding-bottom: 2.5rem;
  }

  .carousel-block {
    margin-top: 0.75rem;
  }

  .nav-btn {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
  }
}