/* =========================================================================
   yannbacquet.fr — feuille de style unique
   Identité alignée sur AD VITAM (ad-vitam.tech) :
   monochrome N&B, grotesque grasse, images légendées, pied charbon.
   ========================================================================= */

:root {
  /* — Palette monochrome — */
  --paper:    #ffffff;
  --ink:      #002b50;   /* titres, texte fort */
  --ink-2:    rgba(0,43,80,0.75);   /* texte secondaire, légendes */
  --ink-3:    rgba(0,43,80,0.25);   /* labels discrets, « DPLG » */
  --line:     #e6e6e6;   /* filets, bordures de cartes */
  --surface:  #f4f4f4;   /* bandeaux CTA, fonds subtils */
  --dark:     #002b50;   /* pied de page + barre de nav */
  --dark-2:   #262626;   /* pastille de nav */
  --on-dark:  #ffffff;
  --on-dark-2:rgba(255,255,255,0.70);

  --f-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --gutter: clamp(1.25rem, 5vw, 5.5rem);
  --maxw: 1320px;
  --measure: 68ch;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.08rem);
  line-height: 1.6;
  font-weight: 400;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

h1, h2, h3 { margin: 0; font-weight: 800; line-height: 1.02; letter-spacing: -0.03em; }
h1 { font-size: clamp(2.4rem, 1.4rem + 4.6vw, 5.4rem); }
h2 { font-size: clamp(1.8rem, 1.2rem + 2.6vw, 3.2rem); }
h3 { font-size: clamp(1.15rem, 1rem + 0.7vw, 1.45rem); font-weight: 700; letter-spacing: -0.02em; }
p  { margin: 0 0 1.1em; max-width: var(--measure); }

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(3.5rem, 2rem + 7vw, 8.5rem); }

/* — Eyebrow / label gris (pas de mono, comme AD VITAM) — */
.eyebrow { font-size: 0.9rem; color: var(--ink-2); font-weight: 500; letter-spacing: 0; margin: 0 0 0.6rem; }

/* — Légende d'image — */
.caption { font-size: 0.82rem; color: var(--ink-2); margin-top: 0.7rem; }

/* — Flèche NE — */
.ne::after { content: " ↗"; font-weight: 500; }

/* =========================== En-tête ================================= */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: clamp(1rem, 2vw, 1.6rem) var(--gutter);
  pointer-events: none;
}
.site-header > * { pointer-events: auto; }
.brand {
  font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em;
  text-decoration: none; color: var(--ink); text-transform: uppercase;
}
/* Nav sombre — masquée en haut, révélée au scroll (comme AD VITAM) */
.nav-shell { display: flex; align-items: center; gap: 0.5rem; }
.nav {
  display: flex; align-items: center; gap: clamp(0.8rem, 1.6vw, 1.7rem);
  background: var(--dark); border-radius: 8px;
  padding: 0.6rem 0.7rem 0.6rem 1.1rem;
  opacity: 0; transform: translateY(-8px); transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
}
.site-header.scrolled .nav { opacity: 1; transform: none; pointer-events: auto; }
.nav a {
  color: var(--on-dark-2); text-decoration: none; font-size: 0.82rem; font-weight: 500;
  white-space: nowrap; transition: color 0.18s ease;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--on-dark); }
.btn-contact {
  background: var(--paper); color: var(--ink); text-decoration: none;
  font-size: 0.82rem; font-weight: 600; padding: 0.5rem 0.9rem; border-radius: 6px;
  border: 1px solid var(--line); white-space: nowrap; transition: background 0.2s ease;
}
.site-header.scrolled .nav .btn-contact { border-color: transparent; }
.btn-contact:hover { background: var(--surface); }

.nav-toggle {
  display: none; background: var(--dark); color: var(--on-dark); border: 0;
  border-radius: 6px; padding: 0.55rem 0.75rem; cursor: pointer;
  font-size: 0.78rem; font-weight: 600;
}

/* décalage sous le header fixe */
.page-top { padding-top: clamp(5rem, 6vw, 7.5rem); }

/* =========================== Hero (accueil) ========================== */
.hero h1 { margin-bottom: 0.2rem; }
.hero .sub { font-size: clamp(1.4rem, 1rem + 2vw, 2.6rem); font-weight: 400; color: var(--ink); letter-spacing: -0.02em; line-height: 1.05; margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }
.figure-wide img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; filter: grayscale(1) contrast(1.02); }
.hero-lede { font-size: clamp(1.1rem, 1rem + 0.6vw, 1.5rem); font-weight: 400; color: var(--ink); max-width: 52ch; margin-top: clamp(2rem, 4vw, 3.5rem); letter-spacing: -0.01em; }

/* =========================== Rangées de rubriques =================== */
.rows { margin-top: clamp(1.5rem, 3vw, 2.5rem); border-top: 1px solid var(--line); }
.rows a {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1.5rem;
  padding: clamp(1.1rem, 2vw, 1.7rem) 0; border-bottom: 1px solid var(--line);
  text-decoration: none; color: var(--ink); transition: padding-inline 0.2s ease, background 0.2s ease;
}
.rows a:hover { background: var(--surface); padding-inline: 1rem; }
.rows .name { font-size: clamp(1.3rem, 1rem + 1.4vw, 2.1rem); font-weight: 800; letter-spacing: -0.03em; text-transform: uppercase; }
.rows .go { font-size: 0.9rem; font-weight: 500; color: var(--ink-2); white-space: nowrap; }
.rows a:hover .go { color: var(--ink); }
.rows .name .tag { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-2); border: 1px solid var(--line); border-radius: 4px; padding: 0.15rem 0.5rem; margin-left: 0.7rem; vertical-align: middle; }

/* =========================== Cartes numérotées ===================== */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(0.6rem, 1.5vw, 1rem); margin-top: clamp(1.5rem, 3vw, 2.5rem); }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }
.card { border: 1px solid var(--line); border-radius: 8px; padding: clamp(1.3rem, 2.5vw, 2rem); display: flex; flex-direction: column; }
.card .num { font-size: 0.78rem; color: var(--ink-3); margin-bottom: 1.4rem; }
.card h3 { margin-bottom: 0.5rem; }
.card p { color: var(--ink-2); font-size: 0.95rem; }
.card .link { margin-top: auto; padding-top: 1.2rem; font-size: 0.88rem; font-weight: 600; color: var(--ink); text-decoration: none; }
.card .link:hover { text-decoration: underline; text-underline-offset: 3px; }

/* =========================== Bandeau CTA =========================== */
.cta {
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap;
  background: var(--surface); border-radius: 8px;
  padding: clamp(1.3rem, 3vw, 2.2rem) clamp(1.4rem, 3vw, 2.4rem);
  margin-top: clamp(2.5rem, 5vw, 4.5rem);
}
.cta .cta-title { font-size: clamp(1.1rem, 1rem + 0.8vw, 1.5rem); font-weight: 700; letter-spacing: -0.02em; }
.cta a { text-decoration: none; color: var(--ink); font-weight: 600; font-size: 0.92rem; white-space: nowrap; }
.cta a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* =========================== Pages intérieures ===================== */
.page-title { margin-bottom: 0.3rem; text-transform: uppercase; }
.page-sub { font-size: clamp(1.4rem, 1rem + 2vw, 2.6rem); font-weight: 400; letter-spacing: -0.02em; line-height: 1.05; color: var(--ink); margin-bottom: 0.9rem; }
.intro-line { color: var(--ink-2); max-width: 60ch; margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }
.breadcrumb { margin-bottom: 1.4rem; font-size: 0.85rem; }
.breadcrumb a { color: var(--ink-2); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb span { color: var(--line); margin-inline: 0.5rem; }

.prose { max-width: var(--measure); }
.prose .lede { font-size: clamp(1.2rem, 1rem + 1vw, 1.7rem); font-weight: 500; letter-spacing: -0.02em; line-height: 1.3; margin-bottom: 1.4rem; }
.prose h2 { font-size: clamp(1.3rem, 1.1rem + 1vw, 1.7rem); margin: 2.2rem 0 0.8rem; }

.fill { margin-top: 2.2rem; padding: 1.3rem 1.5rem; border: 1px dashed var(--line); border-radius: 8px; background: var(--surface); }
.fill .tag { font-size: 0.78rem; color: var(--ink-3); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; display: block; margin-bottom: 0.5rem; }
.fill p { color: var(--ink-2); font-size: 0.9rem; margin: 0; }

/* =========================== Galerie ============================== */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(0.5rem, 1.4vw, 1rem); margin-top: clamp(2rem, 4vw, 3rem); }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .grid { grid-template-columns: 1fr; } }
.tile { position: relative; border: 0; padding: 0; margin: 0; cursor: pointer; background: var(--surface); overflow: hidden; display: block; width: 100%; aspect-ratio: 4 / 5; }
.tile img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.02); transition: transform 0.5s ease, filter 0.5s ease; }
.tile:hover img, .tile:focus-visible img { transform: scale(1.03); }
.tile .ref { position: absolute; left: 0.7rem; bottom: 0.6rem; font-size: 0.7rem; font-weight: 600; color: #fff; mix-blend-mode: difference; opacity: 0; transition: opacity 0.25s ease; }
.tile:hover .ref, .tile:focus-visible .ref { opacity: 0.95; }

/* =========================== Lightbox ============================= */
.lightbox { position: fixed; inset: 0; z-index: 90; display: none; background: rgba(14,14,14,0.95); padding: clamp(1rem, 4vw, 3rem); }
.lightbox.open { display: grid; grid-template-rows: 1fr auto; gap: 1rem; }
.lightbox-stage { display: grid; place-items: center; min-height: 0; }
.lightbox-stage img { max-height: 78vh; max-width: 100%; width: auto; object-fit: contain; }
.lightbox-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; max-width: var(--maxw); margin-inline: auto; width: 100%; flex-wrap: wrap; color: #eee; }
.lightbox-bar .ref { font-size: 0.75rem; color: #b0b0b0; font-weight: 500; }
.lightbox-bar .ttl { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.02em; }
.lightbox-ask { background: var(--paper); color: var(--ink); text-decoration: none; font-size: 0.85rem; font-weight: 600; padding: 0.7rem 1.1rem; border-radius: 6px; }
.lightbox-close { position: absolute; top: clamp(0.8rem,2vw,1.6rem); right: clamp(0.8rem,2vw,1.6rem); background: none; border: 1px solid rgba(255,255,255,0.3); color: #fff; border-radius: 6px; font-size: 0.78rem; font-weight: 600; padding: 0.45rem 0.7rem; cursor: pointer; }
.lb-nav { background: none; border: 1px solid rgba(255,255,255,0.25); color: #fff; width: 3rem; height: 3rem; border-radius: 50%; cursor: pointer; font-size: 1.2rem; position: absolute; top: 42%; transition: background 0.2s ease; }
.lb-nav:hover { background: rgba(255,255,255,0.12); }
.lb-prev { left: clamp(0.5rem,2vw,2rem); } .lb-next { right: clamp(0.5rem,2vw,2rem); }

/* =========================== Pied de page ========================= */
.site-footer { background: var(--dark); color: var(--on-dark); margin-top: clamp(3rem, 6vw, 7rem); }
.site-footer .wrap { padding-block: clamp(3rem, 5vw, 5rem); }
.footer-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 2rem; flex-wrap: wrap; padding-bottom: clamp(2.5rem, 5vw, 4rem); border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer-top .fbrand { font-weight: 800; font-size: 1.5rem; text-transform: uppercase; letter-spacing: -0.02em; }
.footer-top p { color: var(--on-dark-2); max-width: 46ch; margin: 0; font-size: 0.95rem; }
.footer-grid { display: grid; grid-template-columns: 1.1fr 1fr 1fr 1fr; gap: 2rem; padding-top: clamp(2.5rem, 5vw, 4rem); }
.footer-grid h4 { font-size: 0.95rem; font-weight: 700; margin: 0 0 0.9rem; letter-spacing: -0.01em; }
.footer-grid a, .footer-grid p { color: var(--on-dark-2); text-decoration: none; font-size: 0.9rem; }
.footer-grid a:hover { color: var(--on-dark); }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 0.45rem; }
.footer-project a { color: var(--on-dark); font-weight: 700; text-decoration: none; }
.colophon { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: clamp(2.5rem, 5vw, 4rem); font-size: 0.78rem; color: var(--on-dark-2); }
.colophon a { color: var(--on-dark-2); text-decoration: none; margin-left: 1rem; }
.colophon a:hover { color: var(--on-dark); }
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.6rem; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

/* =========================== Accessibilité ======================== */
a:focus-visible, button:focus-visible, .tile:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 0.6rem; z-index: 100; background: var(--ink); color: #fff; padding: 0.5rem 0.9rem; border-radius: 6px; }

/* =========================== Nav responsive ======================= */
@media (max-width: 860px) {
  .nav-toggle { display: inline-block; }
  .nav {
    position: fixed; top: 4.5rem; right: var(--gutter); left: var(--gutter);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 0.6rem 1rem 1rem; opacity: 0; transform: translateY(-8px); pointer-events: none;
  }
  .nav.open { opacity: 1; transform: none; pointer-events: auto; }
  .site-header.scrolled .nav:not(.open) { opacity: 0; pointer-events: none; }
  .nav a { padding-block: 0.8rem; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .nav .btn-contact { margin-top: 0.6rem; text-align: center; }
  .figure-wide img { aspect-ratio: 4 / 3; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.001ms !important; }
}

/* =========================== Frise (parcours) ====================== */
.timeline { border-top: 1px solid var(--line); margin-top: clamp(1.5rem, 3vw, 2.5rem); }
.epoch { display: grid; grid-template-columns: 9rem 1fr; gap: 1.5rem; padding: clamp(1.4rem, 2.5vw, 2.2rem) 0; border-bottom: 1px solid var(--line); }
.epoch .years { font-weight: 800; font-size: 1.05rem; letter-spacing: -0.02em; color: var(--ink); }
.epoch h3 { margin-bottom: 0.4rem; }
.epoch p { color: var(--ink-2); font-size: 0.95rem; max-width: 62ch; margin-bottom: 0.4em; }
.epoch p strong { color: var(--ink); font-weight: 600; }
.epoch .place { font-size: 0.8rem; color: var(--ink-3); }
@media (max-width: 640px) { .epoch { grid-template-columns: 1fr; gap: 0.4rem; } }

/* Pratiques — sections numérotées */
.pratique { display: grid; grid-template-columns: 4.5rem 1fr; gap: 1.5rem; padding: clamp(1.6rem, 3vw, 2.4rem) 0; border-bottom: 1px solid var(--line); }
.pratique .num { font-weight: 800; font-size: 1.1rem; color: var(--ink-3); }
.pratique h2 { font-size: clamp(1.4rem, 1.1rem + 1.4vw, 2.1rem); margin-bottom: 0.5rem; text-transform: uppercase; }
.pratique p { color: var(--ink-2); font-size: 0.97rem; max-width: 62ch; }
.pratique .link { font-weight: 600; color: var(--ink); text-decoration: none; font-size: 0.92rem; }
.pratique .link:hover { text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 640px) { .pratique { grid-template-columns: 1fr; gap: 0.3rem; } }

/* =========================== V4 — ajustements ===================== */
/* En-tête translucide au scroll (fond blanc ~20% + flou) pour la lisibilité */
.site-header.scrolled { background: rgba(255,255,255,0.2); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.nav { background: transparent; }
.nav a { color: var(--ink); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-underline-offset: 5px; }
.nav .btn-contact { color: var(--ink); background: #fff; border-color: var(--line); }
@media (max-width: 860px) {
  .nav { background: rgba(255,255,255,0.96); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); border: 1px solid var(--line); }
  .nav a { border-bottom: 1px solid var(--line); }
}
/* Image d'accueil pleine largeur */
.hero-full { margin: clamp(1.5rem,3vw,2.5rem) 0 0; }
.hero-full img { width: 100%; aspect-ratio: 16 / 6; object-fit: cover; filter: grayscale(1) contrast(1.02); }
.hero-full figcaption { margin-top: 0.7rem; }
/* Bandes d'images cliquables (pratiques) */
.strip { display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 0.6rem; margin: 1.1rem 0 0.3rem; scroll-snap-type: x proximity; }
.strip::-webkit-scrollbar { height: 6px; }
.strip::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }
.strip .tile { flex: 0 0 auto; width: 132px; aspect-ratio: 4 / 5; scroll-snap-align: start; }
.strip .tile .ref { display: none; }