/* ===========================================================
   Blog Greg AI — styles dédiés (complète style.css)
   Réutilise les tokens de :root (--bg, --surface, --ink, --line,
   --muted, --blue…). Couleur "étudiant" alignée sur la nav (#3A45C4).
   =========================================================== */

:root{
  --etu:#3A45C4;
  --blog-measure:720px;
}

/* Lien "Blog" actif dans la nav */
.nav-link-inline[aria-current="page"]{ color:var(--blue); border-bottom-color:var(--blue); }

/* ---------- Conteneur général ---------- */
.blog-main{ max-width:1180px; margin:0 auto; padding:0 56px; }

/* ---------- En-tête de la liste ---------- */
.blog-hero{ padding:84px 0 40px; }
.blog-eyebrow{
  font-size:12.5px; font-weight:700; letter-spacing:.16em; text-transform:uppercase;
  color:var(--blue); margin:0 0 18px;
}
.blog-hero h1{
  font-size:clamp(34px,4.6vw,52px); line-height:1.05; letter-spacing:-0.03em;
  font-weight:800; margin:0 0 20px; color:var(--ink);
}
.blog-lead{
  font-size:clamp(17px,1.7vw,20px); line-height:1.55; color:var(--muted);
  max-width:640px; margin:0;
}

/* ---------- Filtres d'audience ---------- */
.blog-filters{ display:flex; gap:10px; flex-wrap:wrap; margin-top:34px; }
.blog-filter{
  appearance:none; cursor:pointer; font-family:inherit;
  background:var(--surface); border:1.5px solid var(--line);
  color:#3a3a42; font-size:14px; font-weight:600;
  padding:9px 18px; border-radius:999px;
  transition:background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.blog-filter:hover{ transform:translateY(-1px); border-color:rgba(10,10,10,.18); }
.blog-filter.is-active{ background:var(--ink); color:#fff; border-color:var(--ink); }
.blog-filter[data-filter="pro"].is-active{ background:var(--blue); border-color:var(--blue); }
.blog-filter[data-filter="etu"].is-active{ background:var(--etu); border-color:var(--etu); }

/* ---------- Grille d'articles ---------- */
.blog-grid{
  display:grid; grid-template-columns:repeat(auto-fill,minmax(330px,1fr));
  gap:26px; padding:46px 0 90px;
}

/* ---------- Carte article ---------- */
.post-card{
  display:flex; flex-direction:column; position:relative;
  background:var(--surface); border:1px solid var(--line); border-radius:20px;
  padding:28px 28px 26px; overflow:hidden;
  transition:transform .22s cubic-bezier(.2,.7,.2,1), box-shadow .22s ease, border-color .22s ease;
}
a.post-card{ color:inherit; }
a.post-card:hover{
  transform:translateY(-4px);
  box-shadow:0 22px 44px -26px rgba(10,10,10,.32);
  border-color:rgba(10,10,10,.14);
}
.post-card::before{
  content:""; position:absolute; left:0; top:0; height:100%; width:4px;
  background:var(--blue); opacity:0; transition:opacity .22s ease;
}
.post-card[data-cat="etu"]::before{ background:var(--etu); }
a.post-card:hover::before{ opacity:1; }

.post-tag{
  align-self:flex-start; font-size:11.5px; font-weight:700; letter-spacing:.06em;
  text-transform:uppercase; padding:5px 11px; border-radius:999px; margin-bottom:16px;
}
.post-tag--pro{ color:var(--blue); background:rgba(21,97,255,.09); }
.post-tag--etu{ color:var(--etu); background:rgba(58,69,196,.10); }

.post-card h2{
  font-size:21px; line-height:1.25; letter-spacing:-0.02em; font-weight:700;
  margin:0 0 12px; color:var(--ink-2);
}
.post-card p{
  font-size:15px; line-height:1.6; color:var(--muted); margin:0 0 22px; flex-grow:1;
}
.post-meta{
  display:flex; align-items:center; gap:10px; font-size:13px; color:var(--muted-2);
  font-weight:500;
}
.post-meta .dot{ width:3px; height:3px; border-radius:50%; background:currentColor; opacity:.6; }
.post-readmore{
  margin-top:18px; font-size:14.5px; font-weight:600; color:var(--blue);
  display:inline-flex; align-items:center; gap:8px;
}
.post-card[data-cat="etu"] .post-readmore{ color:var(--etu); }
.post-readmore svg{ width:16px; height:16px; transition:transform .2s ease; }
a.post-card:hover .post-readmore svg{ transform:translateX(4px); }

/* Cartes "à venir" (non cliquables) */
.post-card.is-soon{ background:transparent; border-style:dashed; box-shadow:none; }
.post-card.is-soon h2{ color:#4a4a55; }
.soon-badge{
  align-self:flex-start; font-size:11px; font-weight:700; letter-spacing:.08em;
  text-transform:uppercase; color:var(--muted-2);
  border:1px solid var(--line); padding:5px 11px; border-radius:999px; margin-top:auto;
}

/* ===========================================================
   Page article
   =========================================================== */
.article-main{ padding:56px 0 40px; }
.article-wrap{ max-width:var(--blog-measure); margin:0 auto; padding:0 24px; }

.breadcrumb{ font-size:13.5px; color:var(--muted-2); margin-bottom:30px; }
.breadcrumb a{ color:var(--muted); font-weight:500; }
.breadcrumb a:hover{ color:var(--ink); }
.breadcrumb span{ margin:0 8px; opacity:.5; }

.article-head{ margin-bottom:38px; }
.article-head .post-tag{ margin-bottom:20px; }
.article-head h1{
  font-size:clamp(30px,4vw,44px); line-height:1.12; letter-spacing:-0.03em;
  font-weight:800; margin:0 0 22px; color:var(--ink);
}
.article-standfirst{
  font-size:clamp(18px,2vw,21px); line-height:1.55; color:#3a3a44; font-weight:400;
  margin:0 0 26px;
}
.article-meta{
  display:flex; align-items:center; gap:10px; flex-wrap:wrap;
  font-size:14px; color:var(--muted-2); font-weight:500;
  padding-top:22px; border-top:1px solid var(--line);
}
.article-meta .dot{ width:3px; height:3px; border-radius:50%; background:currentColor; opacity:.6; }

/* ---------- Illustration d'en-tête d'article ---------- */
.article-figure{ margin:6px 0 42px; }
.article-figure svg{ display:block; width:100%; height:auto; border-radius:20px; border:1px solid var(--line); }
@media (max-width:640px){ .article-figure{ margin:2px 0 30px; } }

/* ---------- Corps rédactionnel (style livre) ---------- */
.prose{ font-size:18px; line-height:1.75; color:#26262e; }
.prose > p{ margin:0 0 24px; }
.prose h2{
  font-size:26px; line-height:1.25; letter-spacing:-0.02em; font-weight:700;
  color:var(--ink); margin:46px 0 18px;
}
.prose h3{
  font-size:20px; line-height:1.3; letter-spacing:-0.01em; font-weight:700;
  color:var(--ink-2); margin:34px 0 14px;
}
.prose ul, .prose ol{ margin:0 0 24px; padding-left:26px; }
.prose li{ margin:0 0 10px; }
.prose li::marker{ color:var(--muted-2); }
.prose strong{ font-weight:700; color:var(--ink); }
.prose a{ color:var(--blue); border-bottom:1px solid rgba(21,97,255,.3); }
.prose a:hover{ border-bottom-color:var(--blue); }
.prose blockquote{
  margin:30px 0; padding:6px 0 6px 26px; border-left:3px solid var(--blue);
  font-size:20px; line-height:1.5; color:var(--ink-2); font-style:normal;
}
.prose hr{ border:0; border-top:1px solid var(--line); margin:44px 0; }

/* ---------- FAQ ---------- */
.article-faq{ max-width:var(--blog-measure); margin:56px auto 0; padding:0 24px; }
.article-faq h2{
  font-size:24px; letter-spacing:-0.02em; font-weight:700; color:var(--ink); margin:0 0 20px;
}
.faq-item{ border-top:1px solid var(--line); }
.faq-item:last-child{ border-bottom:1px solid var(--line); }
.faq-item summary{
  cursor:pointer; list-style:none; padding:20px 0; font-size:17.5px; font-weight:600;
  color:var(--ink-2); display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:"+"; font-size:22px; font-weight:400; color:var(--muted-2); flex:none;
  transition:transform .2s ease;
}
.faq-item[open] summary::after{ content:"–"; }
.faq-item p{ margin:0 0 20px; font-size:16.5px; line-height:1.7; color:#3a3a44; }
.faq-item a{ color:var(--blue); border-bottom:1px solid rgba(21,97,255,.3); }
.faq-item a:hover{ border-bottom-color:var(--blue); }

/* ---------- Encart CTA ---------- */
.article-cta{
  max-width:var(--blog-measure); margin:64px auto 0; padding:40px 40px 42px;
  background:linear-gradient(180deg,#f7f9ff,#eef2fe);
  border:1px solid rgba(21,97,255,.16); border-radius:24px; text-align:center;
}
.article-cta h2{ font-size:26px; letter-spacing:-0.02em; font-weight:800; margin:0 0 12px; color:var(--ink); }
.article-cta p{ font-size:16.5px; line-height:1.6; color:var(--muted); margin:0 auto 26px; max-width:460px; }
.article-cta .btn-blue{ cursor:pointer; border:none; }

/* ---------- Pour aller plus loin (articles liés) ---------- */
.article-related{ max-width:var(--blog-measure); margin:64px auto 0; padding:0 24px; }
.article-related h2{
  font-size:22px; letter-spacing:-0.02em; font-weight:700; color:var(--ink);
  margin:0 0 22px; padding-top:26px; border-top:1px solid var(--line);
}
.related-grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.related-card{
  display:flex; flex-direction:column; position:relative; color:inherit;
  background:var(--surface); border:1px solid var(--line); border-radius:16px;
  padding:20px 22px; overflow:hidden;
  transition:transform .2s cubic-bezier(.2,.7,.2,1), box-shadow .2s ease, border-color .2s ease;
}
.related-card::before{
  content:""; position:absolute; left:0; top:0; height:100%; width:4px;
  background:var(--blue); opacity:0; transition:opacity .2s ease;
}
.related-card[data-cat="etu"]::before{ background:var(--etu); }
.related-card:hover{
  transform:translateY(-3px);
  box-shadow:0 18px 36px -24px rgba(10,10,10,.3);
  border-color:rgba(10,10,10,.14);
}
.related-card:hover::before{ opacity:1; }
.related-card .post-tag{ margin-bottom:12px; }
.related-card h3{
  font-size:16.5px; line-height:1.3; letter-spacing:-0.01em; font-weight:700;
  color:var(--ink-2); margin:0;
}

/* ---------- Bas d'article ---------- */
.article-disclaimer{
  max-width:var(--blog-measure); margin:40px auto 0; padding:0 24px;
  font-size:13.5px; line-height:1.6; color:var(--muted-2);
}
.article-back{
  max-width:var(--blog-measure); margin:36px auto 80px; padding:0 24px;
}
.article-back a{
  font-size:15px; font-weight:600; color:var(--blue);
  display:inline-flex; align-items:center; gap:8px;
}
.article-back svg{ width:16px; height:16px; }

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .blog-main{ padding:0 24px; }
}
@media (max-width:640px){
  .blog-hero{ padding:56px 0 30px; }
  .blog-grid{ grid-template-columns:1fr; padding:34px 0 64px; }
  .article-main{ padding:38px 0 30px; }
  .prose{ font-size:17px; }
  .article-cta{ padding:32px 24px 34px; }
  .related-grid{ grid-template-columns:1fr; }
}