/* ============================================================
   CoopScience — Design éditorial académique
   Palette « presses universitaires » : crème, encre, brique
   ============================================================ */

:root {
  /* Papier & encre */
  --paper:      #FBF9F4;
  --paper-2:    #F4F0E6;
  --paper-3:    #EDE7D9;
  --ink:        #1B1917;
  --ink-soft:   #5C554A;
  --ink-faint:  #8B8375;
  --rule:       #DED7C7;
  --rule-strong:#C4BAA4;

  /* Accents */
  --brique:     #8A2E2A;
  --brique-2:   #A63D34;
  --encre:      #2E4A5C;

  --maxw: 1080px;
  --maxw-text: 680px;

  --serif-display: "Playfair Display", Georgia, serif;
  --serif-text:    "Spectral", Georgia, "Times New Roman", serif;
  --sans:          "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--serif-text);
  font-size: 18px;
  line-height: 1.72;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- Structure ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.section { padding: 84px 0; }
.section--soft { background: var(--paper-2); }
.section--navy { background: var(--ink); color: #E6E1D6; }
.center { text-align: center; }

/* ---------- Typographie ---------- */
h1, h2, h3, h4 { font-family: var(--serif-display); font-weight: 700; color: var(--ink); line-height: 1.16; letter-spacing: -0.01em; }
.section--navy h1, .section--navy h2, .section--navy h3, .section--navy h4 { color: var(--paper); }

.eyebrow {
  display: inline-block;
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--brique);
  margin-bottom: 16px;
}
.section--navy .eyebrow { color: #C9A227; }

h2.title { font-size: clamp(30px, 4vw, 42px); margin-bottom: 16px; }
.lead { font-size: 19.5px; color: var(--ink-soft); max-width: var(--maxw-text); line-height: 1.62; }
.center .lead { margin-left: auto; margin-right: auto; }

/* Filet décoratif sous les titres centrés */
.center .title::after {
  content: ""; display: block; width: 54px; height: 2px;
  background: var(--brique); margin: 20px auto 0;
}

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--sans); font-size: 14.5px; font-weight: 600;
  letter-spacing: .04em;
  padding: 13px 26px; border: 1px solid var(--ink); background: none;
  color: var(--ink); cursor: pointer; transition: all .22s ease;
}
.btn--gold { background: var(--brique); border-color: var(--brique); color: var(--paper); }
.btn--gold:hover { background: var(--brique-2); border-color: var(--brique-2); }
.btn--ghost { background: transparent; border-color: var(--rule-strong); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); background: var(--ink); color: var(--paper); }
.btn--outline { border-color: rgba(255,255,255,.4); color: #fff; }
.btn--outline:hover { background: rgba(255,255,255,.12); }

/* ---------- En-tête / navigation ---------- */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,249,244,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--serif-display); font-weight: 700; font-size: 21px;
  letter-spacing: .01em; color: var(--ink);
}
.brand__mark {
  width: 36px; height: 36px;
  border: 1.5px solid var(--brique); color: var(--brique);
  display: grid; place-items: center;
  font-family: var(--serif-display); font-size: 16px; font-weight: 700;
}
.nav__links { display: flex; align-items: center; gap: 28px; }
.nav__links a {
  font-family: var(--sans); font-size: 13.5px; font-weight: 500;
  letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft);
  padding-bottom: 3px; border-bottom: 1px solid transparent; transition: all .2s;
}
.nav__links a:hover { color: var(--ink); border-bottom-color: var(--rule-strong); }
.nav__links a.active { color: var(--brique); border-bottom-color: var(--brique); }
.nav__cta { display: flex; align-items: center; gap: 14px; }
.nav__toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav__toggle span { display: block; width: 24px; height: 1.5px; background: var(--ink); margin: 5px 0; transition: .3s; }

/* ---------- Héro / masthead ---------- */
.hero {
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  padding: 88px 0 76px;
}
.hero__grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: center; }
.hero h1 { font-size: clamp(38px, 5.4vw, 62px); margin-bottom: 22px; letter-spacing: -0.02em; }
.hero h1 .hl { color: var(--brique); font-style: italic; }
.hero__lead { font-size: 20px; color: var(--ink-soft); margin-bottom: 32px; max-width: 540px; }
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 34px; }
.hero__stats { display: flex; gap: 40px; flex-wrap: wrap; padding-top: 26px; border-top: 1px solid var(--rule); }
.hero__stat b { display: block; font-family: var(--serif-display); font-size: 30px; color: var(--brique); line-height: 1.2; }
.hero__stat span { font-family: var(--sans); font-size: 12.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); }

/* Encadré sommaire (héro droite) */
.hero__card { background: var(--paper-2); border: 1px solid var(--rule); padding: 32px; }
.hero__card h3 { font-size: 19px; margin-bottom: 4px; }
.hero__steps { margin-top: 20px; }
.hero__step { display: flex; gap: 16px; padding: 15px 0; border-top: 1px solid var(--rule); }
.hero__step:first-child { border-top: none; }
.hero__step .num {
  flex: 0 0 auto; font-family: var(--serif-display); font-size: 15px;
  color: var(--brique); font-style: italic; padding-top: 2px; min-width: 22px;
}
.hero__step b { display: block; font-family: var(--serif-display); font-size: 16.5px; }
.hero__step p { font-size: 14.5px; color: var(--ink-soft); margin: 0; line-height: 1.5; }

/* ---------- Bandeau de confiance ---------- */
.trust { border-bottom: 1px solid var(--rule); background: var(--paper-2); }
.trust__row { display: flex; align-items: center; justify-content: space-between; gap: 26px; padding: 24px 0; flex-wrap: wrap; }
.trust__item {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--sans); font-size: 12.5px; font-weight: 500;
  letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft);
}
.trust__item svg { color: var(--brique); flex: 0 0 auto; }

/* ---------- Grilles ---------- */
.grid { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
/* Grille sans filets (pour blocs autonomes) */
.grid--plain { gap: 28px; background: none; border: none; }

/* ---------- Bloc / carte éditoriale ---------- */
.card { background: var(--paper); padding: 34px 30px; transition: background .25s ease; }
.grid--plain .card { border: 1px solid var(--rule); }
.card:hover { background: var(--paper-2); }
.card__icon { color: var(--brique); margin-bottom: 18px; }
.card__step {
  display: block; font-family: var(--sans); font-size: 11px; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase; color: var(--ink-faint);
}
.card h3 { font-size: 21px; margin: 8px 0 12px; }
.card p { color: var(--ink-soft); font-size: 16.5px; line-height: 1.6; }
.card ul { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--rule); }
.card ul li { position: relative; padding-left: 20px; margin-bottom: 9px; font-size: 15.5px; color: var(--ink-soft); }
.card ul li::before { content: "—"; position: absolute; left: 0; color: var(--brique); }

/* ---------- Processus ---------- */
.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; margin-top: 46px; counter-reset: step; }
.process__item { position: relative; padding-top: 22px; border-top: 2px solid var(--brique); }
.process__item::before {
  counter-increment: step; content: counter(step, upper-roman);
  font-family: var(--serif-display); font-size: 15px; font-style: italic;
  color: var(--brique); display: block; margin-bottom: 10px; letter-spacing: .1em;
}
.process__item h4 { font-size: 19px; margin-bottom: 8px; }
.process__item p { color: var(--ink-soft); font-size: 16px; }
.section--navy .process__item { border-top-color: #C9A227; }
.section--navy .process__item::before { color: #C9A227; }
.section--navy .process__item p { color: #B8B2A5; }

/* ---------- Citations / témoignages ---------- */
.quote { background: var(--paper); padding: 32px 30px; position: relative; }
.grid--plain .quote { border: 1px solid var(--rule); }
.quote p { font-size: 17.5px; font-style: italic; color: var(--ink); line-height: 1.6; }
.quote p::before { content: "« "; color: var(--brique); }
.quote p::after { content: " »"; color: var(--brique); }
.quote__who { display: flex; align-items: center; gap: 13px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--rule); }
.quote__ava {
  width: 40px; height: 40px; border: 1px solid var(--brique); color: var(--brique);
  display: grid; place-items: center; font-family: var(--serif-display); font-size: 14px; font-weight: 700;
}
.quote__who b { display: block; font-family: var(--serif-display); font-size: 16px; font-style: normal; }
.quote__who span { font-family: var(--sans); font-size: 12.5px; letter-spacing: .04em; color: var(--ink-faint); }

/* ---------- Appel à l'action ---------- */
.cta { background: var(--ink); color: var(--paper); padding: 62px 48px; text-align: center; }
.cta h2 { color: var(--paper); font-size: clamp(26px, 3.4vw, 36px); margin-bottom: 16px; }
.cta h2::after { display: none; }
.cta p { color: #B8B2A5; margin: 0 auto 28px; max-width: 560px; font-size: 17.5px; }
.cta .btn--gold { background: #C9A227; border-color: #C9A227; color: var(--ink); }
.cta .btn--gold:hover { background: #D9B646; border-color: #D9B646; }
.cta .btn--ghost { border-color: rgba(255,255,255,.35); color: var(--paper); }
.cta .btn--ghost:hover { background: var(--paper); border-color: var(--paper); color: var(--ink); }

/* ---------- Pied de page ---------- */
.footer { background: var(--ink); color: #A9A296; padding: 66px 0 30px; }
.footer__grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 44px; }
.footer h4 {
  color: var(--paper); font-family: var(--sans); font-size: 11.5px;
  text-transform: uppercase; letter-spacing: .18em; margin-bottom: 18px; font-weight: 600;
}
.footer a { color: #A9A296; font-size: 16px; line-height: 2.05; transition: color .2s; }
.footer a:hover { color: #C9A227; }
.footer .brand { color: var(--paper); margin-bottom: 16px; }
.footer .brand__mark { border-color: #C9A227; color: #C9A227; }
.footer__about p { font-size: 16px; max-width: 330px; line-height: 1.6; }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.14); padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-family: var(--sans); font-size: 13px;
}

/* ---------- En-tête de page interne ---------- */
.page-head { background: var(--paper-2); padding: 70px 0 58px; border-bottom: 1px solid var(--rule); }
.page-head h1 { font-size: clamp(34px, 4.6vw, 50px); margin-bottom: 16px; letter-spacing: -0.02em; }
.breadcrumb {
  font-family: var(--sans); font-size: 12px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: 18px;
}
.breadcrumb a:hover { color: var(--brique); }

/* ---------- Formulaire ---------- */
.form { background: var(--paper-2); border: 1px solid var(--rule); padding: 36px; }
.field { margin-bottom: 22px; }
.field label {
  display: block; font-family: var(--sans); font-weight: 600; font-size: 11.5px;
  letter-spacing: .12em; text-transform: uppercase; margin-bottom: 8px; color: var(--ink-soft);
}
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 14px; font-family: var(--serif-text); font-size: 16.5px;
  border: 1px solid var(--rule-strong); background: var(--paper); color: var(--ink);
  transition: border-color .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--brique); }
.field textarea { min-height: 140px; resize: vertical; }
.field--row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.info-list li { display: flex; gap: 14px; margin-bottom: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--rule); }
.info-list li:last-child { border-bottom: none; }
.info-list .ic { flex: 0 0 auto; color: var(--brique); padding-top: 3px; }
.info-list b { display: block; font-family: var(--serif-display); font-size: 17px; }
.info-list span { color: var(--ink-soft); font-size: 16px; }

/* ---------- Livre : couverture ---------- */
.book-cover {
  aspect-ratio: 3/4.3;
  background: var(--ink);
  color: var(--paper);
  padding: 38px 32px; display: flex; flex-direction: column;
  position: relative; border: 1px solid var(--ink);
  box-shadow: 14px 14px 0 var(--paper-3);
}
.book-cover::before {
  content: ""; position: absolute; inset: 14px;
  border: 1px solid rgba(255,255,255,.22); pointer-events: none;
}
.book-cover .kicker {
  font-family: var(--sans); font-size: 10.5px; letter-spacing: .22em;
  text-transform: uppercase; color: #C9A227; font-weight: 600;
}
.book-cover h2 { color: var(--paper); font-size: clamp(23px, 2.9vw, 30px); line-height: 1.18; margin: 18px 0 14px; }
.book-cover .sub { color: #B8B2A5; font-size: 15.5px; font-style: italic; flex: 1; }
.book-cover .motto { display: flex; gap: 7px; flex-wrap: wrap; margin: 20px 0; }
.book-cover .motto span {
  border: 1px solid rgba(255,255,255,.3); padding: 4px 12px;
  font-family: var(--sans); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: #E6E1D6;
}
.book-cover .author {
  border-top: 1px solid rgba(255,255,255,.24); padding-top: 16px;
  font-size: 14.5px; color: #D6D0C4; position: relative; z-index: 1;
}
.book-cover .author b { color: var(--paper); font-family: var(--serif-display); }

/* ---------- Sommaire : parties & chapitres ---------- */
.part { margin-bottom: 52px; }
.part__head {
  display: flex; align-items: baseline; gap: 18px;
  padding-bottom: 14px; border-bottom: 2px solid var(--ink); margin-bottom: 6px;
}
.part__num { font-family: var(--serif-display); font-size: 34px; font-style: italic; color: var(--brique); line-height: 1; }
.part__head h3 { font-size: 26px; }
.part__head .part__tag {
  margin-left: auto; font-family: var(--sans); font-size: 11px;
  letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint);
}
.chap { display: flex; gap: 18px; padding: 16px 0; border-bottom: 1px solid var(--rule); }
.chap .chap__n {
  flex: 0 0 auto; min-width: 26px; font-family: var(--serif-display);
  font-size: 15px; font-style: italic; color: var(--brique); padding-top: 3px;
}
.chap b { font-family: var(--serif-display); font-size: 18px; display: block; }
.chap p { color: var(--ink-soft); font-size: 15.5px; margin: 3px 0 0; line-height: 1.5; }

/* ---------- Podcast ---------- */
.episode { padding: 34px 0; border-bottom: 1px solid var(--rule); }
.episode:first-of-type { border-top: 1px solid var(--rule); }
.episode__top { display: flex; gap: 22px; align-items: flex-start; }
.episode__badge {
  flex: 0 0 auto; font-family: var(--serif-display); font-size: 30px;
  font-style: italic; color: var(--brique); line-height: 1; padding-top: 4px; min-width: 46px;
}
.episode__meta {
  font-family: var(--sans); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-faint);
}
.episode__top h3 { font-size: 24px; margin: 6px 0 10px; }
.episode__top p { color: var(--ink-soft); font-size: 16.5px; line-height: 1.6; }
.episode__player { margin-top: 20px; }
.episode__player audio { width: 100%; height: 42px; }
.episode__links { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 16px; }
.episode__links a {
  font-family: var(--sans); font-size: 12.5px; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft);
  border-bottom: 1px solid var(--rule-strong); padding-bottom: 2px; transition: all .2s;
}
.episode__links a:hover { color: var(--brique); border-bottom-color: var(--brique); }

/* ---------- Blog : entrées éditoriales ---------- */
.post { background: var(--paper); display: flex; flex-direction: column; padding: 30px 28px; transition: background .25s; }
.grid--plain .post { border: 1px solid var(--rule); }
.post:hover { background: var(--paper-2); }
.post__thumb {
  aspect-ratio: 16/7; background: var(--paper-3); color: var(--brique);
  display: grid; place-items: center; margin: -30px -28px 22px; border-bottom: 1px solid var(--rule);
}
.post__body { flex: 1; display: flex; flex-direction: column; }
.post__tag {
  font-family: var(--sans); font-size: 10.5px; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase; color: var(--brique);
}
.post__body h3 { font-size: 20px; margin: 9px 0 11px; line-height: 1.25; }
.post__body p { color: var(--ink-soft); font-size: 16px; flex: 1; line-height: 1.55; }
.post__meta {
  margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--rule);
  font-family: var(--sans); font-size: 11.5px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--ink-faint); display: flex; justify-content: space-between;
}

/* ---------- Article ---------- */
.article { max-width: var(--maxw-text); margin: 0 auto; }
.article p { margin-bottom: 22px; font-size: 18.5px; line-height: 1.78; }
.article > p:first-of-type::first-letter {
  float: left; font-family: var(--serif-display); font-size: 66px;
  line-height: .82; padding: 6px 12px 0 0; color: var(--brique);
}
.article h2 { font-size: 29px; margin: 44px 0 16px; }
.article h2::after { display: none; }
.article h3 { font-size: 22px; margin: 32px 0 12px; }
.article ul.rich { list-style: none; padding-left: 0; margin-bottom: 22px; }
.article ul.rich li { position: relative; padding-left: 24px; margin-bottom: 10px; }
.article ul.rich li::before { content: "—"; position: absolute; left: 0; color: var(--brique); }
.article blockquote {
  border-left: 2px solid var(--brique); padding: 4px 0 4px 24px;
  font-style: italic; font-size: 20px; color: var(--ink); margin: 30px 0;
}

/* ---------- FAQ ---------- */
.faq__item { border-bottom: 1px solid var(--rule); }
.faq__item:first-child { border-top: 1px solid var(--rule); }
.faq__q {
  width: 100%; text-align: left; background: none; border: none;
  padding: 22px 0; font-family: var(--serif-display); font-weight: 700;
  font-size: 19px; color: var(--ink); cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
}
.faq__q .plus { color: var(--brique); font-size: 22px; font-family: var(--sans); font-weight: 400; transition: transform .25s; }
.faq__item.open .faq__q .plus { transform: rotate(45deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq__a p { padding: 0 0 24px; color: var(--ink-soft); margin: 0; font-size: 16.5px; max-width: 640px; }

/* ---------- Notices ---------- */
.notice { padding: 15px 18px; font-size: 16px; margin-bottom: 22px; display: none; border-left: 3px solid; }
.notice--ok { background: var(--paper-2); color: #2F5D3A; border-color: #2F5D3A; }

/* ---------- Animations ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .hero__grid { grid-template-columns: 1fr; gap: 46px; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 17px; }
  .nav__links, .nav__cta .btn--ghost { display: none; }
  .nav__toggle { display: block; }
  .nav.open .nav__links {
    display: flex; position: absolute; top: 76px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; background: var(--paper);
    padding: 22px 28px; gap: 18px; border-bottom: 1px solid var(--rule);
  }
  .section { padding: 58px 0; }
  .grid--3, .grid--4, .grid--2, .process, .field--row, .footer__grid { grid-template-columns: 1fr; }
  .cta { padding: 40px 26px; }
  .episode__top { flex-direction: column; gap: 10px; }
  .book-cover { box-shadow: 8px 8px 0 var(--paper-3); }
  .article > p:first-of-type::first-letter { font-size: 52px; }
}