:root {
  --volume-grid-width: min(92vw, 1080px);
  --volume-grid-gap: clamp(10px, 2vw, 18px);
  --volume-card-ratio: 3 / 4;
  --volume-transition-ms: 900ms;
  --volume-ease: cubic-bezier(.2, .8, .2, 1);
}

.volume-grid {
  width: min(100%, var(--volume-grid-width));
  margin-left: auto;
  margin-right: auto;
  display: grid;
  gap: var(--volume-grid-gap);
  justify-content: center;
  align-items: stretch;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.volume-card {
  position: relative;
  width: 100%;
  aspect-ratio: var(--volume-card-ratio);
  border-radius:12px;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: radial-gradient(circle at top, rgba(248, 250, 252, 0.92), rgba(240, 245, 255, 0.95));
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.08);
  transition-property: transform, box-shadow;
  transition-duration: var(--volume-transition-ms), var(--volume-transition-ms);
  transition-timing-function: var(--volume-ease), var(--volume-ease);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.volume-card:hover,
.volume-card:focus-within {
  transform: scale(1.2);
  box-shadow: 0 34px 80px rgba(15, 23, 42, 0.2);
  z-index: 50;
}

.volume-card__link {
  position: relative;
  display: block;
  height: 100%;
  color: inherit;
  text-decoration: none;
  overflow: hidden;
}

.volume-card__layer {
  position: absolute;
  inset: 0;
  transition-property: transform, opacity;
  transition-duration: var(--volume-transition-ms), var(--volume-transition-ms);
  transition-timing-function: var(--volume-ease), var(--volume-ease);
}

.volume-card__media {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: transparent;
  transition-property: transform, opacity;
  transition-duration: var(--volume-transition-ms), var(--volume-transition-ms);
  transition-timing-function: var(--volume-ease), var(--volume-ease);
}

.volume-card__media img,
.volume-card__image--placeholder {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #f8fafc;
  border-radius: 0;
}

.volume-card__image--placeholder {
  display: grid;
  place-items: center;
  background: repeating-linear-gradient(135deg, rgba(148, 163, 184, 0.18) 0px, rgba(148, 163, 184, 0.18) 24px, rgba(100, 116, 139, 0.24) 24px, rgba(100, 116, 139, 0.24) 48px);
  color: rgba(15, 23, 42, 0.65);
  font-weight: 600;
  letter-spacing: .08em;
  font-size: .9rem;
  text-transform: uppercase;
}

.volume-card__image--placeholder::after {
  content: "Visuel à venir";
}

.volume-card__title-strip {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.05rem 1.6rem;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0) 0%, rgba(15, 23, 42, 0.78) 70%, rgba(15, 23, 42, 0.92) 100%);
  color: #f8fafc;
  font-weight: 600;
  font-size: clamp(1.1rem, 2.1vw, 1.4rem);
  text-transform: uppercase;
  letter-spacing: .02em;
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.2;
}

.volume-card__title-strip h3 {
  margin: 0;
  font: inherit;
  color: inherit;
}

.volume-card__title-secondary {
  display: block;
  font-size: clamp(.85rem, 1.8vw, 1rem);
  letter-spacing: .04em;
  opacity: .92;
}

.volume-card__content {
  position: absolute;
  inset: 0;
  padding: clamp(1.6rem, 3vw, 2.3rem);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: clamp(.6rem, 1.2vw, .95rem);
  background: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(235,243,255,0.96) 100%);
  opacity: 0;
  transform: translateY(26px);
  pointer-events: none;
  transition-property: transform, opacity;
  transition-duration: var(--volume-transition-ms), var(--volume-transition-ms);
  transition-timing-function: var(--volume-ease), var(--volume-ease);
}

.volume-card__content h3 {
  margin: 0;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: #0f172a;
  line-height: 1.3;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.volume-card__subtitle {
  margin: 0;
  font-size: 1rem;
  color: rgba(30, 64, 175, 0.82);
  font-weight: 500;
  line-height: 1.4;
}

.volume-card__subtitle--empty {
  color: rgba(30, 41, 59, 0.5);
  font-style: italic;
  font-size: 0.9rem;
}

/* Styles pour le résumé dans la section summary */

.volume-card__summary-trigger {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: .95rem 1.6rem;
  background: rgba(15, 23, 42, 0.08);
  color: rgba(15, 23, 42, 0.9);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  transform: translateY(120%);
  opacity: 0;
  transition-property: transform, opacity;
  transition-duration: var(--volume-transition-ms), var(--volume-transition-ms);
  transition-timing-function: var(--volume-ease), var(--volume-ease);
  pointer-events: none;
}

.volume-card__summary-trigger::after {
  content: "↗";
  font-size: 1.1rem;
  opacity: .6;
}

.volume-card__summary {
  position: absolute;
  inset: 0;
  padding: clamp(1.8rem, 3.4vw, 2.6rem);
  background: rgba(15, 23, 42, 0.95);
  color: #e2e8f0;
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
  transition-property: transform, opacity;
  transition-duration: var(--volume-transition-ms);
  transition-timing-function: var(--volume-ease);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.volume-card__summary-inner {
  overflow-y: scroll;
  overflow-x: hidden;
  padding-right: .3rem;
  position: relative;
  height: 100%;
  
  /* Masquer la barre de scroll pour tous les navigateurs */
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE et Edge */
}

/* Masquer la barre de scroll pour Webkit (Chrome, Safari) */
.volume-card__summary-inner::-webkit-scrollbar {
  display: none;
}

/* Indicateur visuel pour montrer qu'il y a plus de contenu */
.volume-card__summary-inner::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: .3rem;
  height: 30px;
  background: linear-gradient(transparent, rgba(15, 23, 42, 0.95));
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

.volume-card__summary-inner.has-overflow::after {
  opacity: 1;
}

/* Masquer l'indicateur quand on est en bas */
.volume-card__summary-inner.scrolled-to-bottom::after {
  opacity: 0;
}

/* Indication visuelle que le contenu est cliquable */
.volume-card__summary-inner.has-overflow {
  cursor: pointer;
}

.volume-card__summary-inner.has-overflow:hover::after {
  opacity: 0.8;
}

.volume-card__summary h4 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.8);
}

.volume-card__summary p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.65;
  color: rgba(226, 232, 240, 0.92);
}

.volume-card:hover .volume-card__media,
.volume-card:focus-within .volume-card__media {
  transform: translateY(-100%);
}

.volume-card:hover .volume-card__content,
.volume-card:focus-within .volume-card__content {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.volume-card:hover .volume-card__summary-trigger,
.volume-card:focus-within .volume-card__summary-trigger {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.volume-card__summary-trigger:hover + .volume-card__summary,
.volume-card__summary-trigger:focus-visible + .volume-card__summary,
.volume-card__summary:hover {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.volume-card__summary-trigger:hover,
.volume-card__summary:hover {
  cursor: pointer;
}

.volume-card__link:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 3px rgba(59, 130, 246, 0.45);
}

@media (max-width: 960px) {
  :root {
    --volume-grid-width: min(96vw, 960px);
  }
}

@media (max-width: 640px) {
  :root {
    --volume-grid-gap: 18px;
    --volume-grid-width: 94vw;
  }

  .volume-card,
  .volume-card__media,
  .volume-card__content,
  .volume-card__summary,
  .volume-card__summary-trigger {
    position: relative;
    transform: none !important;
    opacity: 1;
  }

  .volume-card {
    min-height: 360px;
  }

  .volume-card__summary {
    display: none;
  }

  .volume-card__summary-trigger {
    pointer-events: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .volume-card,
  .volume-card__media,
  .volume-card__content,
  .volume-card__summary,
  .volume-card__summary-trigger {
    transition-duration: var(--volume-transition-ms);
    transition-timing-function: var(--volume-ease);
  }
}