:root {
  --marine: #001E78;
  --bleu: #0076CC;
  --ciel: #00B8F5;
  --degrade: linear-gradient(120deg, #00B8F5 0%, #0076CC 45%, #000D8A 100%);
  --fond: #F6F8FE;
  --texte: #0B1A4A;
  --doux: #4B5A85;
  --ligne: rgba(0, 30, 120, .09);
  --ombre: 0 1px 2px rgba(0,30,120,.04), 0 12px 40px -12px rgba(0,30,120,.14);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
[id] { scroll-margin-top: 96px; }
body { margin: 0; background: var(--fond); color: var(--texte); font: 400 17px/1.7 Inter, system-ui, -apple-system, sans-serif; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--bleu); }
h1, h2, h3 { font-family: Manrope, Inter, sans-serif; color: var(--marine); letter-spacing: -.025em; }
.conteneur { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.grad { background: var(--degrade); -webkit-background-clip: text; background-clip: text; color: transparent; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 22px; border-radius: 999px; text-decoration: none; font: 600 .95rem/1 Inter, sans-serif; white-space: nowrap; transition: transform .25s, box-shadow .25s; }
.btn-plein { background: var(--degrade); color: #fff; box-shadow: 0 10px 30px -8px rgba(0,118,204,.55); }
.btn-plein:hover { transform: translateY(-2px); }

.nav { position: fixed; inset: 14px 0 auto; z-index: 50; pointer-events: none; }
.nav-barre { pointer-events: auto; max-width: 1080px; margin: 0 auto; width: calc(100% - 32px); display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 10px 10px 10px 22px; border-radius: 999px; background: rgba(255,255,255,.78); border: 1px solid rgba(255,255,255,.9); box-shadow: 0 8px 32px -12px rgba(0,30,120,.18); backdrop-filter: saturate(1.6) blur(18px); -webkit-backdrop-filter: saturate(1.6) blur(18px); }
.nav-logo img { height: 26px; width: auto; }
.nav-liens { display: flex; gap: 4px; }
.nav-liens a { text-decoration: none; font: 500 .92rem/1 Inter, sans-serif; color: var(--doux); padding: 10px 14px; border-radius: 999px; }
.nav-liens a:hover, .nav-liens a[aria-current] { color: var(--marine); background: rgba(0,118,204,.07); }
.nav .btn { padding: 12px 18px; font-size: .9rem; }

.entete-guide { padding: 132px 0 40px; position: relative; overflow: hidden; }
.entete-guide::before { content: ""; position: absolute; width: 520px; height: 520px; right: -120px; top: -160px; border-radius: 50%; background: #7FDBFF; filter: blur(90px); opacity: .45; z-index: -1; }
.ariane { font-size: .88rem; color: var(--doux); display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0 0 22px; }
.ariane li + li::before { content: "›"; margin-right: 8px; color: #9AA7CC; }
.ariane a { color: var(--doux); text-decoration: none; }
.ariane a:hover { color: var(--marine); }
.surtitre { display: inline-flex; align-items: center; gap: 10px; font: 600 .78rem/1 Inter, sans-serif; letter-spacing: .14em; text-transform: uppercase; color: var(--bleu); }
.surtitre::before { content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--degrade); }
.entete-guide h1 { font-size: clamp(2.2rem, 5vw, 3.7rem); line-height: 1.05; font-weight: 800; letter-spacing: -.035em; margin: 18px 0 20px; max-width: 900px; }
.meta { color: var(--doux); font-size: .92rem; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.meta b { color: var(--marine); font-weight: 600; }
.couverture { margin-top: 36px; border-radius: 26px; overflow: hidden; box-shadow: var(--ombre); border: 1px solid #fff; aspect-ratio: 3 / 2; max-height: 520px; width: 100%; }
.couverture img { width: 100%; height: 100%; object-fit: cover; }

.corps { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 56px; align-items: start; padding: 24px 0 40px; }
.sommaire { position: sticky; top: 110px; font-size: .92rem; }
.sommaire p { font: 700 .78rem/1 Inter, sans-serif; letter-spacing: .12em; text-transform: uppercase; color: var(--marine); margin: 0 0 14px; }
.sommaire ol { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--ligne); }
.sommaire a { display: block; padding: 7px 0 7px 16px; margin-left: -2px; border-left: 2px solid transparent; color: var(--doux); text-decoration: none; line-height: 1.4; }
.sommaire a:hover, .sommaire a.actif { color: var(--marine); border-left-color: var(--bleu); }

.article { max-width: 740px; }
.enbref { padding: 24px 28px; border-radius: 20px; background: linear-gradient(120deg, rgba(0,184,245,.1), rgba(0,13,138,.06)); border: 1px solid rgba(0,118,204,.18); margin-bottom: 36px; }
.enbref span { display: block; font: 700 .78rem/1 Inter, sans-serif; letter-spacing: .12em; text-transform: uppercase; color: var(--bleu); margin-bottom: 10px; }
.enbref p { margin: 0; color: var(--marine); font-size: 1.05rem; }
.article h2 { font-size: clamp(1.5rem, 3vw, 2rem); line-height: 1.15; margin: 48px 0 16px; }
.article p { margin: 0 0 16px; color: #25325F; }
.article ul, .article ol { margin: 0 0 20px; padding-left: 22px; color: #25325F; }
.article li { margin-bottom: 10px; }
.article li::marker { color: var(--bleu); font-weight: 700; }
.article strong { color: var(--marine); }
ol.etapes, ol.idees { list-style: none; padding: 0; counter-reset: n; }
ol.etapes li, ol.idees li { counter-increment: n; position: relative; padding: 18px 20px 18px 68px; background: #fff; border: 1px solid var(--ligne); border-radius: 16px; margin-bottom: 12px; }
ol.etapes li::before, ol.idees li::before { content: counter(n); position: absolute; left: 18px; top: 16px; width: 34px; height: 34px; border-radius: 11px; display: grid; place-items: center; background: var(--degrade); color: #fff; font: 800 .9rem/1 Manrope, sans-serif; }
.faq-guide details { background: #fff; border: 1px solid var(--ligne); border-radius: 16px; margin-bottom: 10px; }
.faq-guide summary { cursor: pointer; list-style: none; padding: 18px 22px; font: 700 1rem/1.4 Manrope, sans-serif; color: var(--marine); display: flex; justify-content: space-between; gap: 16px; }
.faq-guide summary::after { content: "+"; color: var(--bleu); font-size: 1.3rem; line-height: 1; }
.faq-guide details[open] summary::after { content: "–"; }
.faq-guide summary::-webkit-details-marker { display: none; }
.faq-guide details p { padding: 0 22px 18px; margin: 0; }

.auteur { display: flex; gap: 16px; align-items: center; margin-top: 44px; padding: 22px; border-radius: 18px; background: #fff; border: 1px solid var(--ligne); }
.auteur-initiales { flex: none; width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center; background: var(--degrade); color: #fff; font: 800 1rem/1 Manrope, sans-serif; }
.auteur p { margin: 0; font-size: .93rem; color: var(--doux); }
.auteur b { color: var(--marine); }

.appel { margin: 48px 0 24px; padding: clamp(28px, 5vw, 44px); border-radius: 26px; background: #020B3A url(/img/cohorte.webp) center / cover; position: relative; overflow: hidden; isolation: isolate; color: #B6C3E6; }
.appel::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgba(2,11,58,.95), rgba(2,11,58,.7)); }
.appel h2 { color: #fff; margin: 0 0 12px; font-size: clamp(1.5rem, 3vw, 2rem); }
.appel p { color: #B6C3E6; margin: 0 0 22px; max-width: 560px; }

.lire-aussi { padding: 40px 0 80px; }
.lire-aussi h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 24px; }
.cartes { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.carte { display: block; text-decoration: none; background: #fff; border: 1px solid var(--ligne); border-radius: 20px; overflow: hidden; transition: transform .35s, box-shadow .35s; }
.carte:hover { transform: translateY(-4px); box-shadow: var(--ombre); }
.carte img { aspect-ratio: 3 / 2; object-fit: cover; width: 100%; }
.carte div { padding: 18px 20px 22px; }
.carte small { font: 600 .72rem/1 Inter, sans-serif; letter-spacing: .12em; text-transform: uppercase; color: var(--bleu); }
.carte h3 { margin: 10px 0 8px; font-size: 1.1rem; line-height: 1.3; }
.carte p { margin: 0; color: var(--doux); font-size: .93rem; line-height: 1.55; }

.pied { padding: 40px 0; border-top: 1px solid var(--ligne); }
.pied-haut { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.pied-haut img { height: 24px; width: auto; }
.pied-haut nav { display: flex; gap: 20px; flex-wrap: wrap; }
.pied-haut nav a { text-decoration: none; color: var(--doux); font-size: .93rem; }
.pied-bas { margin-top: 22px; font-size: .85rem; color: #8C99BF; }

@media (max-width: 980px) {
  .nav-liens { display: none; }
  .corps { grid-template-columns: 1fr; gap: 0; }
  .sommaire { position: static; margin-bottom: 28px; padding: 20px; background: #fff; border: 1px solid var(--ligne); border-radius: 18px; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .conteneur { padding: 0 16px; }
  .nav { inset: 10px 0 auto; }
  .nav-barre { width: calc(100% - 20px); padding: 8px 8px 8px 16px; }
  .nav-logo img { height: 20px; }
  .nav .btn { padding: 11px 14px; font-size: .85rem; }
  .entete-guide { padding-top: 110px; }
  .couverture { border-radius: 18px; }
  ol.etapes li, ol.idees li { padding: 16px 16px 16px 60px; }
  ol.etapes li::before, ol.idees li::before { left: 14px; }
  .appel .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; } }