/* =========================================================================
   D/ACT — Atelier d'architecture
   Feuille de style principale
   Concept : « feuille de dessin » — gabarit, repères de calage, cartouche.
   ========================================================================= */

/* -----------------------------------------------------------------------
   1. Jetons (couleurs, typo, mesures)
   ----------------------------------------------------------------------- */
:root {
  /* Papier calque / graphite */
  --paper:      #eceae4;
  --paper-2:    #e3e1da;   /* panneaux, médias */
  --paper-3:    #f3f2ed;   /* surfaces claires */
  --ink:        #17181a;   /* texte principal */
  --ink-soft:   #56574f;   /* texte secondaire */
  --line:       #c6c4ba;   /* traits / filets */
  --line-soft:  #d6d4cb;
  --accent:     #002fa7;   /* bleu Klein (IKB) — repère de calage */
  --accent-dk:  #002277;

  /* Typographie */
  --display: "KoHo", "Schibsted Grotesk", "Helvetica Neue", Arial, sans-serif;
  --sans: "Schibsted Grotesk", "Helvetica Neue", Arial, sans-serif;
  --mono: "Space Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --step-hero: clamp(2.7rem, 8.2vw, 6.2rem);
  --step-h2:   clamp(1.8rem, 4.4vw, 3.1rem);
  --step-h3:   clamp(1.25rem, 2.2vw, 1.65rem);
  --step-body: 1.0625rem;
  --step-lead: clamp(1.12rem, 1.6vw, 1.35rem);
  --step-mono: 0.74rem;

  /* Mesures */
  --frame: 14px;                 /* retrait du gabarit */
  --gutter: clamp(1.25rem, 5vw, 4.5rem);
  --maxw: 1320px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

/* -----------------------------------------------------------------------
   2. Reset & base
   ----------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: var(--step-body);
  line-height: 1.62;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }

::selection { background: var(--accent); color: var(--paper-3); }

/* Police d'affichage (KoHo) : logo + tous les titres */
.brand__mark,
.hero__title,
.section-head h2,
.cta-band h2,
.plate__title,
.step h3,
.mission__name {
  font-family: var(--display);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* -----------------------------------------------------------------------
   3. Gabarit « feuille de dessin » + repères de calage
   ----------------------------------------------------------------------- */
.sheet-frame {
  position: fixed;
  inset: var(--frame);
  border: 1px solid var(--line);
  pointer-events: none;
  z-index: 60;
}
/* Repères de calage aux quatre angles */
.sheet-frame::before,
.sheet-frame::after {
  content: "";
  position: absolute;
  width: 13px; height: 13px;
  background:
    linear-gradient(var(--accent), var(--accent)) center/100% 1px no-repeat,
    linear-gradient(var(--accent), var(--accent)) center/1px 100% no-repeat;
  opacity: .9;
}
.sheet-frame::before { top: -6.5px; left: -6.5px; }
.sheet-frame::after  { bottom: -6.5px; right: -6.5px; }

.corner-mark {
  position: fixed;
  width: 13px; height: 13px;
  z-index: 61; pointer-events: none;
  background:
    linear-gradient(var(--accent), var(--accent)) center/100% 1px no-repeat,
    linear-gradient(var(--accent), var(--accent)) center/1px 100% no-repeat;
  opacity: .9;
}
.corner-mark.tr { top: calc(var(--frame) - 6.5px);    right: calc(var(--frame) - 6.5px); }
.corner-mark.bl { bottom: calc(var(--frame) - 6.5px); left:  calc(var(--frame) - 6.5px); }

@media (max-width: 640px) {
  :root { --frame: 8px; }
  .sheet-frame, .corner-mark { display: none; }
}

/* -----------------------------------------------------------------------
   4. Conteneur & rythme
   ----------------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(3.5rem, 9vw, 8rem); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }
.section + .section { padding-top: 0; }

.rule { height: 1px; background: var(--line); border: 0; }

/* Étiquette monospace (filets de cote) */
.eyebrow {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: .7rem;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--accent);
  display: inline-block;
}

/* -----------------------------------------------------------------------
   5. En-tête / navigation
   ----------------------------------------------------------------------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}
.site-head__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding-block: .6rem;
}

.brand { display: inline-flex; flex-direction: column; line-height: 1; }
.brand__mark {
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -.01em;
}
.brand__mark .slash { color: var(--accent); font-weight: 700; }
.brand__sub {
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: .42rem;
}

.nav { display: flex; align-items: center; gap: clamp(1.1rem, 2.4vw, 2.4rem); }
.nav a {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-block: .3rem;
  position: relative;
  transition: color .25s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--accent);
}

.nav-toggle { display: none; }

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
    font-family: var(--mono);
    font-size: var(--step-mono);
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--ink);
    gap: .5rem; align-items: center;
  }
  .nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    gap: 1.6rem;
    background: var(--paper);
    transform: translateY(-100%);
    transition: transform .45s var(--ease);
    z-index: 55;
  }
  .nav.is-open { transform: translateY(0); }
  .nav a { font-size: 1.4rem; letter-spacing: .04em; }
  .nav a[aria-current="page"]::after { bottom: -6px; height: 3px; }
  body.nav-open { overflow: hidden; }
}

/* -----------------------------------------------------------------------
   6. Hero
   ----------------------------------------------------------------------- */
.hero { padding-top: clamp(2.5rem, 6vw, 5rem); }
.hero__eyebrow { margin-bottom: clamp(1.4rem, 3vw, 2.4rem); }
.hero__title {
  font-size: var(--step-hero);
  font-weight: 700;
  line-height: .98;
  letter-spacing: -.025em;
  max-width: 16ch;
  text-wrap: balance;
}
.hero__title em {
  font-style: normal;
  color: var(--accent);
}
.hero__draw {
  height: 1px;
  background: var(--ink);
  margin-block: clamp(1.8rem, 4vw, 2.8rem);
  transform-origin: left;
}
.hero__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1.6rem;
}
.hero__lead {
  font-size: var(--step-lead);
  color: var(--ink);
  max-width: 46ch;
  line-height: 1.5;
}
.hero__coord {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .1em;
  color: var(--ink-soft);
  text-align: right;
  white-space: nowrap;
}

/* -----------------------------------------------------------------------
   7. Médias / planches (placeholders élégants)
   ----------------------------------------------------------------------- */
.media {
  position: relative;
  background-color: var(--paper-2);
  /* grille de calage : se voit même sans image -> remplacez par votre photo */
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 34px 34px;
  background-position: center;
  border: 1px solid var(--line);
  overflow: hidden;
}
.media::after {
  content: attr(data-label);
  position: absolute;
  left: 12px; bottom: 10px;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.media img { width: 100%; height: 100%; object-fit: cover; }
/* Dès qu'une vraie image est déposée, la grille et l'étiquette disparaissent */
.media:has(img) { background-image: none; }
.media:has(img)::after { content: none; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--3x4  { aspect-ratio: 3 / 4; }
.media--hero { aspect-ratio: 21 / 9; }

@media (max-width: 700px) {
  .media--hero { aspect-ratio: 4 / 3; }
}

.hero-media { margin-top: clamp(2.5rem, 6vw, 4.5rem); }

/* -----------------------------------------------------------------------
   8. Texte / colonnes
   ----------------------------------------------------------------------- */
.lede {
  font-size: var(--step-lead);
  line-height: 1.5;
  max-width: 40ch;
}
.prose p { max-width: 62ch; }
.prose p + p { margin-top: 1.1rem; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: clamp(1.6rem, 5vw, 5rem);
  align-items: start;
}
.split--rev { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
@media (max-width: 820px) {
  .split, .split--rev { grid-template-columns: 1fr; gap: 2rem; }
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: clamp(2rem, 4vw, 3.4rem);
}
.section-head h2 {
  font-size: var(--step-h2);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.02;
  max-width: 18ch;
}
.section-head__meta {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* -----------------------------------------------------------------------
   9. Planches de projets (grille)
   ----------------------------------------------------------------------- */
.plates {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.6rem, 4vw, 3.4rem) clamp(1.4rem, 3vw, 2.8rem);
}
.plates--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) { .plates--three { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .plates, .plates--three { grid-template-columns: 1fr; } }

.plate { display: flex; flex-direction: column; }
.plate__media { margin-bottom: .9rem; }
.plate a.plate__media,
.plate .plate__media { transition: opacity .3s var(--ease); }
.plate:hover .plate__media { opacity: .82; }

.plate__head {
  display: flex;
  align-items: baseline;
  gap: .7rem;
}
.plate__no {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--accent-dk);
}
.plate__title {
  font-size: var(--step-h3);
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.1;
}
.plate__meta {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: .5rem;
  border-top: 1px solid var(--line-soft);
  padding-top: .5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .9rem;
}

/* Filtres projets */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.4rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  border-block: 1px solid var(--line);
  padding-block: .9rem;
}
.filter {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  transition: color .2s var(--ease);
}
.filter[aria-pressed="true"] { color: var(--ink); }
.filter[aria-pressed="true"]::before { content: "› "; color: var(--accent); }
.filter:hover { color: var(--ink); }
.plate[hidden] { display: none; }

/* -----------------------------------------------------------------------
   10. Liste « missions » / procédé numéroté
   ----------------------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1.4rem, 3vw, 2.6rem);
  counter-reset: step;
}
@media (max-width: 860px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .steps { grid-template-columns: 1fr; } }
.step { border-top: 1px solid var(--ink); padding-top: 1rem; }
.step__no {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--accent-dk);
  display: block;
  margin-bottom: .9rem;
}
.step h3 {
  font-size: 1.18rem;
  font-weight: 600;
  letter-spacing: -.01em;
  margin-bottom: .5rem;
}
.step p { font-size: .96rem; color: var(--ink-soft); line-height: 1.5; }

/* Liste de missions simple */
.missions { display: grid; gap: 0; }
.mission {
  display: grid;
  grid-template-columns: 3.2rem 1fr auto;
  gap: 1.2rem;
  align-items: baseline;
  padding-block: 1.15rem;
  border-top: 1px solid var(--line);
}
.mission:last-child { border-bottom: 1px solid var(--line); }
.mission__no { font-family: var(--mono); font-size: .74rem; color: var(--accent-dk); letter-spacing: .08em; }
.mission__name { font-size: var(--step-h3); font-weight: 500; letter-spacing: -.01em; }
.mission__desc { font-family: var(--mono); font-size: var(--step-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft); text-align: right; max-width: 28ch; }
@media (max-width: 640px) {
  .mission { grid-template-columns: 2.4rem 1fr; }
  .mission__desc { grid-column: 2; text-align: left; margin-top: .3rem; }
}

/* -----------------------------------------------------------------------
   11. Bande d'appel (CTA)
   ----------------------------------------------------------------------- */
.cta-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.6rem;
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.cta-band h2 {
  font-size: var(--step-h2);
  font-weight: 700;
  letter-spacing: -.02em;
  max-width: 20ch;
  line-height: 1.02;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper-3);
  background: var(--ink);
  padding: .95rem 1.6rem;
  border: 1px solid var(--ink);
  transition: background .25s var(--ease), color .25s var(--ease);
}
.btn:hover { background: var(--accent); border-color: var(--accent); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper-3); }
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* -----------------------------------------------------------------------
   12. Formulaire
   ----------------------------------------------------------------------- */
.form { display: grid; gap: 1.4rem; max-width: 640px; }
.field { display: grid; gap: .5rem; }
.field label {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.field input,
.field textarea {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper-3);
  border: 1px solid var(--line);
  padding: .85rem .95rem;
  border-radius: 0;
  transition: border-color .2s var(--ease);
}
.field input:focus,
.field textarea:focus { border-color: var(--ink); outline: none; }
.field textarea { resize: vertical; min-height: 150px; }
.field--row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; }
@media (max-width: 560px) { .field--row { grid-template-columns: 1fr; } }
.hp { position: absolute; left: -9999px; }      /* anti-spam (honeypot) */

.form__note {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .06em;
  color: var(--ink-soft);
}
.form__alert {
  border: 1px solid var(--accent);
  color: var(--accent-dk);
  padding: .9rem 1rem;
  font-size: .95rem;
}
.form__alert--ok { border-color: var(--ink); color: var(--ink); }

/* Coordonnées contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 560px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-cell { background: var(--paper); padding: 1.2rem 1.3rem; }
.contact-cell .k {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: block;
  margin-bottom: .5rem;
}
.contact-cell .v { font-size: 1.05rem; }
.contact-cell a.v:hover { color: var(--accent-dk); }

/* -----------------------------------------------------------------------
   13. Pied de page — cartouche
   ----------------------------------------------------------------------- */
.cartouche { border-top: 1px solid var(--ink); margin-top: clamp(3rem, 8vw, 6rem); }
.cartouche__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-left: 1px solid var(--line);
}
@media (max-width: 760px) { .cartouche__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 420px) { .cartouche__grid { grid-template-columns: 1fr; } }
.cartouche__cell {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.4rem 1.3rem 1.6rem;
  min-height: 116px;
}
.cartouche__k {
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: block;
  margin-bottom: .8rem;
}
.cartouche__v { font-size: .98rem; line-height: 1.4; }
.cartouche__v a:hover { color: var(--accent-dk); }
.cartouche__brand .brand__mark { font-size: 1.7rem; }

.colophon {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .8rem;
  padding-block: 1.4rem;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.colophon a:hover { color: var(--ink); }

/* -----------------------------------------------------------------------
   14. Badges de statut + pages-projets
   ----------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  padding: .3rem .6rem;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  white-space: nowrap;
}
.badge::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ink-soft);
}
.badge--done  { color: var(--ink); border-color: var(--ink); }
.badge--done::before  { background: var(--ink); }
.badge--wip   { color: var(--accent-dk); border-color: var(--accent); }
.badge--wip::before   { background: var(--accent); }
.badge--study { color: var(--ink-soft); border-color: var(--line); }
.badge--study::before { background: transparent; border: 1px solid var(--ink-soft); }

/* Statut posé sur la vignette */
.plate__status { margin-bottom: .7rem; align-self: flex-start; }
.plate__title a { transition: color .2s var(--ease); }
.plate__title a:hover { color: var(--accent-dk); }

/* En-tête de page-projet */
.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem 2.6rem;
  margin-top: 1.8rem;
  border-top: 1px solid var(--line);
  padding-top: 1.4rem;
}
.project-meta__item { display: flex; flex-direction: column; gap: .35rem; }
.project-meta__k {
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.project-meta__v { font-size: 1.05rem; }

/* Figures de projet */
.figure { margin: 0; }
.figure figcaption {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .06em;
  color: var(--ink-soft);
  margin-top: .7rem;
}
.figure--contain {
  background: var(--paper-2);
  border: 1px solid var(--line);
  display: flex; justify-content: center;
  padding: clamp(1rem, 3vw, 2.5rem);
}
.figure--contain img { width: auto; max-height: 80vh; }

.back-link {
  font-family: var(--mono);
  font-size: var(--step-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: inline-flex; gap: .6rem;
  transition: color .2s var(--ease);
}
.back-link:hover { color: var(--accent-dk); }
.back-link .arrow { transition: transform .25s var(--ease); }
.back-link:hover .arrow { transform: translateX(-4px); }

/* -----------------------------------------------------------------------
   15. Apparition au défilement
   ----------------------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .hero__draw { transform: none !important; }
}