html { scroll-behavior: auto; }
body.iv-transition-demo { min-width: 320px; background: var(--iv-black); color: var(--iv-ink); font-size: var(--iv-type-body); line-height: var(--iv-leading-body); overflow-x: clip; }



.iv-transition { position: relative; isolation: isolate; overflow: clip; }
.iv-transition-demo [data-st-container] { padding: var(--iv-shell-gap); }
.iv-transition[data-iv-transition] { margin-top: var(--iv-shell-gap); }
.iv-transition > [data-st-section] { position: relative; min-height: 100svh; margin: 0; z-index: 1; }
.iv-transition > [data-st-section][data-st-01="reveal"] { will-change: transform; }
.iv-transition > .story-panel { z-index: 5; }
.iv-transition .title-motion-stage { position: fixed; top: 0; left: 0; width: 100%; height: 0; z-index: 3; pointer-events: none; will-change: transform; }
.iv-transition .title-motion-stage[data-title="a"] { mix-blend-mode: exclusion; }
.iv-transition .title-motion-stage[hidden], .iv-transition .title-motion-subtitle[hidden] { display: none; }
.iv-transition .title-motion-title { position: absolute; top: 0; left: 50%; margin: 0; padding: 0; transform: translateX(-50%); text-align: center; pointer-events: auto; user-select: text; -webkit-user-select: text; cursor: text; }
.iv-transition .title-motion-subtitle { position: absolute; left: 50%; margin: 0; transform: translateX(-50%); text-align: center; }
/* Masquage instantané des originaux visuels ; leur place et leur sémantique restent intactes. */
.title-motion-active .iv-transition .students-lockup { opacity: 0; }
.iv-transition #titre-avis { user-select: text; -webkit-user-select: text; cursor: text; }
.iv-transition .panel { overflow: clip; border-radius: var(--iv-radius-panel); }
.iv-transition .wrap { width: min(calc(100% - 2 * var(--iv-gutter)), var(--iv-container)); margin-inline: auto; }
.iv-transition .micro { font-size: var(--iv-type-label); font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }

/* Premier bloc : même portraiture et même titre que dans l'Accueil, hors contexte du hero. */
.iv-transition .students-preview { --student-intro-inset: clamp(4rem, 7vw, 7rem); --student-gallery-gap: clamp(1rem, 2.5vw, 2.5rem); --student-gallery-width: min(calc(100vw - var(--iv-shell-gap) - var(--iv-shell-gap) - var(--iv-gutter) - var(--iv-gutter)), var(--iv-container)); --student-entry-offset: calc((var(--student-gallery-width) - var(--student-gallery-gap) - var(--student-gallery-gap) - var(--student-gallery-gap)) / 8); min-height: 115svh; padding: var(--student-intro-inset) 0; color: var(--iv-paper); --iv-grain-opacity: var(--iv-grain-opacity-card); }
.iv-transition .students-preview .students-lockup { position: sticky; z-index: 5; top: 43svh; height: 0; transform: translateY(-50%); text-align: center; pointer-events: none; mix-blend-mode: exclusion; }
.iv-transition .students-lockup :is(h1, h2) { margin: 0; color: #fff; font-family: var(--iv-font-text); font-size: clamp(4rem, 12vw, 9rem); font-weight: 700; line-height: .94; letter-spacing: -.085em; }
.iv-transition .students-lockup p { margin: .6rem 0 0; color: rgba(255,255,255,.6); font-size: .8rem; line-height: 1; text-transform: uppercase; }
/* Essai temporaire du 29/10 : espace d’entrée réduit de 100svh à 50svh sur PC et mobile. */
.iv-transition .students-gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--student-gallery-gap); margin-top: calc(50svh - var(--student-intro-inset) - var(--student-entry-offset)); padding-bottom: 1.5rem; }
.iv-transition .student-tile { min-width: 0; margin: 0; aspect-ratio: 1; }
.iv-transition .student-tile:nth-child(1) { grid-area: 1 / 1; }
.iv-transition .student-tile:nth-child(2) { grid-area: 1 / 3; }
.iv-transition .student-tile:nth-child(3) { grid-area: 1 / 4; }
.iv-transition .student-tile:nth-child(4) { grid-area: 2 / 1; }
.iv-transition .student-tile:nth-child(5) { grid-area: 2 / 2; }
.iv-transition .student-tile:nth-child(6) { grid-area: 2 / 4; }
.iv-transition .student-tile:nth-child(7) { grid-area: 3 / 2; }
.iv-transition .student-tile:nth-child(8) { grid-area: 3 / 3; }
.iv-transition .student-tile:nth-child(9) { grid-area: 3 / 4; }
.iv-transition .student-tile:nth-child(10) { grid-area: 4 / 1; }
.iv-transition .student-tile:nth-child(11) { grid-area: 4 / 2; }
.iv-transition .student-tile:nth-child(12) { grid-area: 4 / 4; }
.iv-transition .student-frame { width: 100%; height: 100%; transform: scale(var(--student-scale, 1)); transform-origin: var(--student-origin, left bottom); will-change: transform; }
.iv-transition .student-frame img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 28%; filter: grayscale(1) contrast(1.2); }
.iv-transition .student-tile figcaption { display: flex; justify-content: space-between; gap: .5rem; margin-top: .45rem; color: rgba(255,255,255,.55); font-size: clamp(.58rem, .8vw, .75rem); line-height: 1.2; text-transform: uppercase; }
.iv-transition .student-tile figcaption span:last-child { text-align: right; }

/* Deuxième bloc : carte opaque qui passe réellement devant le premier titre. */
.iv-transition .story-panel { display: grid; align-items: center; background: var(--iv-paper); }
.iv-transition .section { padding-block: clamp(5rem, 9vw, 9rem); }
.iv-transition .image-story { display: grid; grid-template-columns: 1fr 1fr; gap: var(--iv-grid-gap); }
.iv-transition .story-photo { position: relative; min-height: 540px; overflow: hidden; border-radius: var(--iv-radius-card); background: #222; }
.iv-transition .story-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center; filter: contrast(1.04) saturate(.92); }
.iv-transition .story-photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(0,0,0,.62), transparent 40%); }
.iv-transition .story-photo span { position: absolute; z-index: 1; left: var(--iv-space-6); bottom: var(--iv-space-6); color: var(--iv-white); }
.iv-transition .story-copy { display: flex; flex-direction: column; justify-content: space-between; min-height: 540px; padding: clamp(2rem, 4vw, 4rem); border-radius: var(--iv-radius-card); background: var(--iv-orange); }
.iv-transition .story-copy .micro { color: var(--iv-ink); }
.iv-transition .story-copy h2 { max-width: 11ch; margin: 0; font: 650 clamp(2.6rem, 5vw, 6rem)/1.02 var(--iv-font-text); letter-spacing: -.055em; }
.iv-transition .story-copy p { max-width: 36ch; margin: 1.5rem 0 0; font-size: 1.05rem; }
.iv-transition .story-copy a { width: max-content; display: inline-flex; gap: 1.5rem; align-items: center; margin-top: var(--iv-space-5); padding-bottom: .2rem; border-bottom: 1px solid currentColor; color: var(--iv-ink); font-weight: 750; text-decoration: none; }

/* Troisième bloc : nouveau titre, même axe visuel, révélé sous la carte école. */
.iv-transition .proof-panel { --proof-padding: clamp(7rem, 12vw, 12rem); min-height: 118svh; padding-block: var(--proof-padding); color: var(--iv-paper); --iv-grain-opacity: var(--iv-grain-opacity-card); }
.iv-transition .proof-panel .micro { color: var(--iv-orange); }
.iv-transition .proof-content { min-height: calc(118svh - 2 * var(--proof-padding)); display: flex; flex-direction: column; justify-content: flex-start; }
/* Le titre et les cartes composent un seul bloc de lecture. L'entrée des
   cartes suit le dévoilement mesuré du titre, sans écran vide intermédiaire. */
.iv-transition .proof-head { display: grid; align-content: start; justify-items: center; text-align: center; }
.iv-transition .proof-head h2 { max-width: 13ch; margin: .7rem auto 0; font: 650 clamp(3.6rem, 10vw, 8rem)/.96 var(--iv-font-text); letter-spacing: -.075em; text-wrap: balance; }
.iv-transition .proof-head p { max-width: 40ch; margin: 1.5rem auto 0; color: var(--iv-on-dark-soft); }
.iv-transition .proof-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--iv-grid-gap); margin-top: clamp(2rem, 4vw, 4rem); }
.iv-transition .proof-card { min-height: 260px; display: flex; flex-direction: column; justify-content: space-between; padding: var(--iv-space-6); border: 1px solid var(--iv-line-dark); border-radius: var(--iv-radius-card); }
.iv-transition .proof-card p { max-width: 39ch; margin: 0; color: var(--iv-on-dark-muted); font-size: 1.03rem; }
.iv-transition .proof-card .micro { color: var(--iv-on-dark-soft); }

@media (max-width: 700px) {
  .iv-transition .students-preview { --student-intro-inset: 4rem; --student-entry-offset: calc((var(--student-gallery-width) - var(--student-gallery-gap)) / 4); min-height: 115svh; padding-block: var(--student-intro-inset) 5rem; }
  .iv-transition .students-preview .students-lockup { top: 42svh; }
  .iv-transition .students-lockup :is(h1, h2) { font-size: clamp(3.8rem, 15vw, 6rem); }
  .iv-transition .students-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: clamp(2rem, 6vw, 3rem); }
  .iv-transition .student-tile:nth-child(n) { grid-area: auto; }
  .iv-transition .student-tile figcaption { font-size: .55rem; }
  .iv-transition .image-story, .iv-transition .proof-grid { grid-template-columns: 1fr; }
  .iv-transition .story-photo, .iv-transition .story-copy { min-height: 430px; }
  .iv-transition .proof-panel { --proof-padding: 6rem; min-height: 100svh; }
  .iv-transition .proof-content { min-height: 0; }
  .iv-transition .proof-head h2 { font-size: clamp(3.2rem, 12vw, 5rem); }
  .iv-transition .proof-card { min-height: 190px; }
}

@media (prefers-reduced-motion: reduce) {
  .iv-transition .title-motion-stage { display: none; }
  .title-motion-active .iv-transition .students-lockup { opacity: 1; }
  .iv-transition .students-lockup :is(h1, h2) { pointer-events: auto; user-select: text; }
  .iv-transition .students-gallery { margin-top: clamp(9rem, 16vw, 15rem); }
  .iv-transition .proof-head { min-height: 0; }
  .iv-transition .student-frame { transform: none !important; will-change: auto; }
  .iv-transition > [data-st-section] { transform: none !important; will-change: auto; }
}