/* À propos — une composition ouverte, assortie aux autres pages. */
.about-page {
  --about-header-height: var(--site-header-height);
  --about-nav-height: 73px;
  --about-beige: var(--bg-warm);
  --about-rule: rgba(184, 173, 161, 0.5);
  --about-section-space: clamp(3rem, 5vw, 5rem);
  --about-section-fade-top: clamp(5rem, 10vw, 9rem);
  --about-section-fade-bottom: clamp(4rem, 7vw, 6rem);
  background: var(--bg-white);
}

.about-container {
  width: min(calc(100% - 2 * var(--page-inline-space)), 1680px);
  margin-inline: auto;
}

/* Le sommaire reprend la navigation de Prestations sous le bandeau. */
.about-jump-nav {
  position: sticky;
  top: var(--about-header-height);
  z-index: 60;
  background: rgba(255, 255, 255, 0.95);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.about-jump-list {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: clamp(1.25rem, 4vw, 3.5rem);
  list-style: none;
  border-bottom: 1px solid var(--about-rule);
}

.about-jump-list li {
  min-width: 0;
}

.about-jump-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  min-height: 72px;
  padding-block: 0.85rem;
  color: var(--gray);
  font-family: var(--font-serif);
  font-size: clamp(1.125rem, 1.6vw, 1.5rem);
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  transition: color 220ms ease;
}

.about-jump-icon {
  display: block;
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  color: var(--accent);
}

.about-jump-link span {
  min-width: 0;
}

.about-jump-link::after {
  content: '';
  position: absolute;
  inset: auto 0 -1px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 220ms ease;
}

.about-jump-link:hover,
.about-jump-link[aria-current='location'] {
  color: var(--accent);
}

.about-jump-link:hover::after,
.about-jump-link[aria-current='location']::after {
  transform: scaleX(1);
}

.about-page h1,
.about-page h2,
.about-page h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--dark);
  text-wrap: balance;
}

.about-page h2 {
  font-size: clamp(2rem, 3.2vw, 3.25rem);
  line-height: 1.15;
}

.about-page p {
  color: var(--gray);
  font-size: 1rem;
  line-height: 1.75;
  text-wrap: pretty;
}

/* Une introduction centrée ouvre la page avant les rubriques alignées à gauche. */
.about-page-heading {
  padding-block: clamp(0.75rem, 1.25vw, 1.25rem) 2rem;
  text-align: center;
}

.about-page-title {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  column-gap: clamp(1.25rem, 3.5vw, 4rem);
  max-width: 76rem;
  margin-inline: auto;
}

.about-page-title::before,
.about-page-title::after {
  content: '';
  height: 1px;
}

.about-page-title::before {
  background: linear-gradient(90deg, transparent, rgba(39, 76, 107, 0.5));
}

.about-page-title::after {
  background: linear-gradient(90deg, rgba(39, 76, 107, 0.5), transparent);
}

.about-page-heading h1 {
  font-size: clamp(2.75rem, 5vw, 5rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.about-page .about-page-lead {
  max-width: none;
  margin: clamp(1rem, 1.5vw, 1.5rem) auto 0;
  font-size: clamp(1.0625rem, 1.45vw, 1.375rem);
  line-height: 1.6;
  text-wrap: balance;
}

/* Chaque rubrique suit le même rythme, avec une alternance beige et blanc. */
.about-vision,
.about-intro,
.about-values,
.about-detail,
.about-approach {
  padding-block: var(--about-section-space);
  scroll-margin-top: calc(var(--about-header-height) + var(--about-nav-height));
}

.about-vision,
.about-values,
.about-approach {
  background: linear-gradient(180deg,
    var(--bg-white),
    var(--about-beige) var(--about-section-fade-top),
    var(--about-beige) calc(100% - var(--about-section-fade-bottom)),
    var(--bg-white));
}

.about-intro,
.about-detail {
  background: var(--bg-white);
}

.about-vision-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.35fr);
  grid-template-areas:
    "title title"
    "drawing copy";
  align-items: center;
  gap: clamp(1.5rem, 2.5vw, 2.5rem) clamp(2rem, 4.5vw, 5rem);
}

.about-vision-layout h2 {
  grid-area: title;
}

.about-vision-copy {
  grid-area: copy;
  min-width: 0;
}

.about-vision-copy p {
  max-width: 60ch;
}

.about-vision-copy p + p {
  margin-top: 1rem;
}

.about-vision-drawing {
  grid-area: drawing;
  justify-self: center;
  width: clamp(264px, 26.4vw, 374px);
  max-width: 100%;
  height: auto;
}

/* Le titre précède les paragraphes et la photo, alignés sur une même rangée. */
.about-intro-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.35fr);
  grid-template-areas:
    "title title"
    "copy media";
  align-items: start;
  gap: 1.5rem clamp(2rem, 4.5vw, 5rem);
}

.about-intro-copy,
.about-intro-media {
  min-width: 0;
}

.about-intro-layout h2 {
  grid-area: title;
  max-width: none;
  margin: 0;
  font-size: clamp(2.15rem, 3.4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.about-intro-copy {
  grid-area: copy;
}

.about-intro-media {
  grid-area: media;
  position: relative;
  align-self: stretch;
  min-height: 0;
}

.about-intro-copy p {
  max-width: 54ch;
}

.about-intro-copy p + p {
  margin-top: 1.1rem;
}

/* Les deux photos partagent les mêmes fondus que Réalisations. */
.about-intro-photo,
.about-detail-photo {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: contain;
  -webkit-mask-image:
    linear-gradient(90deg, transparent, #000 3%, #000 97%, transparent),
    linear-gradient(180deg, transparent, #000 3%, #000 90%, transparent);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(90deg, transparent, #000 3%, #000 97%, transparent),
    linear-gradient(180deg, transparent, #000 3%, #000 90%, transparent);
  mask-composite: intersect;
}

.about-intro-photo {
  /* La photo entière tient dans la hauteur du texte et la largeur disponible. */
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  object-position: 50% 0;
}

/* Le logo accompagne le titre qui présente les quatre valeurs. */
.about-values-heading {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2vw, 2rem);
  margin-bottom: clamp(2.5rem, 4vw, 4rem);
}

.about-values-heading h2 {
  min-width: 0;
}

.about-values-emblem {
  flex-shrink: 0;
  width: clamp(72px, 6vw, 96px);
  height: auto;
}

.about-values-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(2rem, 3vw, 3rem);
}

.about-value {
  min-width: 0;
  border-top: 1px solid var(--about-rule);
  padding-top: 1.25rem;
}

.about-value p {
  max-width: 58ch;
}

.about-value-icon {
  width: 38px;
  height: 38px;
  margin-bottom: 1rem;
}

.about-value h3 {
  margin-bottom: 0.85rem;
  font-size: clamp(1.5rem, 2vw, 2rem);
  line-height: 1.2;
}

/* Les trois attentions de la pose se détachent sur un fond blanc. */
.about-detail-feature {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-areas:
    "title title"
    "media copy";
  align-items: start;
  gap: 1.5rem clamp(2rem, 4.5vw, 5rem);
  margin-bottom: clamp(2rem, 3.5vw, 3.5rem);
}

.about-detail-copy {
  min-width: 0;
  grid-area: copy;
}

.about-detail-feature h2 {
  grid-area: title;
  margin: 0;
}

.about-detail-copy p {
  max-width: 68ch;
}

.about-detail-copy p + p {
  margin-top: 1rem;
}

.about-detail-media {
  min-width: 0;
  grid-area: media;
}

.about-detail-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.75rem, 4vw, 4.5rem);
}

.about-detail-point {
  min-width: 0;
  border-top: 1px solid var(--about-rule);
  padding-top: 1.5rem;
}

.about-detail-point h3 {
  margin-bottom: 1rem;
  font-size: clamp(1.5rem, 2vw, 2rem);
  line-height: 1.2;
  text-wrap: wrap;
}

/* Une fin de page calme, avec un accès au contact et aux chantiers. */
.about-approach {
  padding-bottom: var(--page-end-space);
}

.about-approach-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.about-approach h2 {
  margin: 0;
}

.about-approach-copy {
  min-width: 0;
  max-width: 56.25rem;
  margin-top: clamp(1.5rem, 2.5vw, 2rem);
}

.about-approach-copy p {
  margin: 0;
  text-wrap: balance;
}

.about-approach-illustration {
  display: block;
  width: min(100%, 30rem);
  height: auto;
  margin-top: clamp(1.5rem, 2.5vw, 2rem);
  filter: brightness(1.02);
  mix-blend-mode: multiply;
}

.about-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  max-width: 100%;
  margin-top: 1.75rem;
}

.about-actions .btn {
  min-height: 48px;
  max-width: 100%;
  white-space: normal;
}

.about-text-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  color: var(--accent);
  font-size: 0.875rem;
  text-decoration: underline;
  text-decoration-color: var(--about-rule);
  text-underline-offset: 0.35em;
}

.about-text-link:hover {
  text-decoration-color: currentColor;
}

/* Le focus reste accessible, sans contour du titre après un clic ou un toucher. */
.about-page [data-about-pointer-focus]:focus {
  outline: none;
}

.about-page a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}

@media (max-width: 1100px) {
  .about-values-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-detail-points {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .about-detail-point p {
    max-width: 75ch;
  }
}

@media (max-width: 1000px) {
  .about-intro-layout,
  .about-detail-feature {
    grid-template-columns: 1fr;
  }

  .about-intro-copy p {
    max-width: 68ch;
  }

  .about-intro-layout {
    grid-template-areas:
      "title"
      "copy"
      "media";
  }

  .about-intro-photo {
    position: static;
    transform: none;
    width: 100%;
    max-height: none;
    aspect-ratio: 3 / 2;
    object-fit: cover;
    object-position: 50% 50%;
  }

  .about-detail-feature {
    grid-template-areas:
      "title"
      "copy"
      "media";
  }

  .about-intro-media,
  .about-detail-media {
    width: 100%;
    max-width: 900px;
    margin-inline: auto;
  }
}

@media (max-width: 700px) {
  .about-page {
    --about-nav-height: 57px;
  }

  /* Comme les prestations, garder uniquement les pictogrammes sur une ligne. */
  .about-jump-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    padding: 0;
  }

  .about-jump-link {
    gap: 0;
    min-height: 56px;
    height: 100%;
    padding: 0.75rem 0;
  }

  .about-jump-link[aria-current='location'] {
    background: rgba(39, 76, 107, 0.07);
  }

  .about-jump-link span {
    display: none;
  }

  .about-jump-icon {
    width: 24px;
    height: 24px;
  }
}

@media (max-width: 600px) {
  .about-page-title {
    display: block;
  }

  .about-page-title::before,
  .about-page-title::after {
    display: none;
  }

  .about-values-emblem {
    width: 52px;
  }

  .about-vision-layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "title"
      "drawing"
      "copy";
  }

  .about-vision-drawing {
    width: min(72%, 240px);
  }

  .about-values-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .about-intro-layout {
    gap: 1.75rem;
  }

  .about-detail-feature {
    margin-bottom: 2rem;
  }

  .about-approach-illustration {
    width: min(100%, 20rem);
  }
}

@media (max-width: 360px) {
  .about-values-heading {
    gap: 0.75rem;
  }

  .about-values-emblem {
    width: 40px;
  }
}

/* Même ouverture depuis le centre que le menu Prestations, à toutes les tailles d’écran. */
@keyframes aboutMenuOpening {
  from { clip-path: inset(-6px 50%); }
  to { clip-path: inset(-6px -6px); }
}

@media (prefers-reduced-motion: no-preference) {
  .about-jump-nav > .about-jump-list {
    animation: aboutMenuOpening 1400ms cubic-bezier(0.65, 0, 0.35, 1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-page a,
  .about-jump-link::after {
    transition: none;
  }
}

/* Sur un écran bas ou fortement agrandi, conserver la place pour la lecture. */
@media (max-height: 520px) {
  .about-jump-nav {
    position: static;
  }

  .about-chapter {
    scroll-margin-top: calc(var(--about-header-height) + 16px);
  }
}