/* Feuille de style unique du site. Pas de framework, pas de préprocesseur.
   Les couleurs, la police et les arrondis sont définis une seule fois, ici, dans :root. */

/* ---------- Polices (hébergées sur le site, aucun appel à Google) ---------- */
@font-face{font-family:"Plus Jakarta Sans";font-weight:400;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-400-normal.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plus Jakarta Sans";font-weight:500;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-500-normal.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plus Jakarta Sans";font-weight:600;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-600-normal.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plus Jakarta Sans";font-weight:700;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-700-normal.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plus Jakarta Sans";font-weight:800;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-800-normal.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plus Jakarta Sans";font-weight:400;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-ext-400-normal.woff2") format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Plus Jakarta Sans";font-weight:700;font-style:normal;font-display:swap;src:url("../fonts/plus-jakarta-sans-latin-ext-700-normal.woff2") format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

/* ---------- Variables ---------- */
:root{
  --bg:#F5F7FA;
  --surface:#FFFFFF;
  --ink:#0F1A2E;
  --muted:#46526A;
  --line:#D8DFEA;
  --accent:#244F9E;
  --accent-ink:#FFFFFF;
  --tint:#E6EDF8;
  --focus:#244F9E;
  --r:12px;            /* un seul arrondi pour tout le site */
  --nav-h:68px;
  --wrap:1120px;
  --font:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0B111F;
  --surface:#121A2C;
  --ink:#E8EDF6;
  --muted:#A8B3C8;
  --line:#25304A;
  --accent:#8CB0EE;
  --accent-ink:#0B111F;
  --tint:#16213A;
  --focus:#8CB0EE;
  color-scheme:dark;
}

/* ---------- Base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--nav-h) + 16px);overflow-x:clip}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:1.0625rem;line-height:1.65;overflow-x:clip}
img{max-width:100%;display:block}
a{color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
h1,h2,h3{margin:0;line-height:1.15;letter-spacing:-0.015em;font-weight:800}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:6px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:16px;top:-80px;background:var(--accent);color:var(--accent-ink);padding:10px 16px;border-radius:var(--r);z-index:30;font-weight:700;text-decoration:none}
.skip:focus{top:12px}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:24px}
.measure{max-width:65ch}

/* ---------- Navigation ---------- */
.nav{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}
.nav__bar{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{font-weight:800;letter-spacing:-0.01em;color:var(--ink);text-decoration:none;font-size:1.125rem;white-space:nowrap}
.nav__menu{display:flex;align-items:center;gap:6px}
.nav__links{display:flex;align-items:center;gap:4px}
.nav__links a{display:inline-block;padding:8px 12px;border-radius:var(--r);color:var(--ink);text-decoration:none;font-weight:600;font-size:.9375rem;white-space:nowrap}
.nav__links a:hover{background:var(--tint)}
.nav__links a[aria-current="page"]{background:var(--tint);color:var(--accent)}
.nav__tools{display:flex;align-items:center;gap:8px}
.btn.nav__toggle{display:none}

/* ---------- Boutons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border-radius:var(--r);border:1px solid transparent;font:inherit;font-weight:700;font-size:1rem;line-height:1;text-decoration:none;cursor:pointer;white-space:nowrap;transition:transform .15s ease,background-color .15s ease}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--accent);color:var(--accent-ink)}
.btn--primary:hover{filter:brightness(1.08);text-decoration:none}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn--ghost:hover{background:var(--tint);text-decoration:none}
.btn--small{min-height:40px;padding:0 14px;font-size:.9375rem}

/* ---------- Accueil : hero ---------- */
.hero{padding-block:48px 72px}
.hero__grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);gap:64px;align-items:center}
.hero__eyebrow{font-weight:700;font-size:.9375rem;color:var(--accent);margin-bottom:18px}
.hero h1{font-size:clamp(2rem,4vw,3.1rem);line-height:1.1;margin-bottom:20px}
.hero__lead{font-size:1.1875rem;color:var(--muted);max-width:40ch;margin-bottom:32px}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px}
/* Animations d'accueil : particules (canvas) et forme liquide (SVG). Décoratives, masquées aux lecteurs d'écran. */
.hero{position:relative;overflow:hidden}
.hero__canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.hero__grid{position:relative}
.hero__visual{justify-self:end;width:100%;max-width:420px;aspect-ratio:1/1}
.blob{width:100%;height:100%;display:block;overflow:visible}
.blob__stop--a{stop-color:var(--accent);stop-opacity:.9}
.blob__stop--b{stop-color:var(--accent);stop-opacity:.28}
.blob__shape--front{fill:url(#blob-grad)}
.blob__shape--back{fill:var(--accent);fill-opacity:.12}

/* ---------- Sections génériques ---------- */
.section{padding-block:72px}
.section--tint{background:var(--tint)}
.section h2{font-size:clamp(1.6rem,3vw,2.2rem);margin-bottom:20px}
.section h3{font-size:1.25rem;margin-bottom:10px}
.lead{font-size:1.1875rem;color:var(--muted)}

/* Faits en bref */
.facts{display:grid;grid-template-columns:1fr 1fr;column-gap:56px;row-gap:28px;margin:36px 0 0;padding:0}
.facts div{display:block}
.facts dt{font-size:.9375rem;font-weight:600;color:var(--muted);margin-bottom:4px}
.facts dd{margin:0;font-weight:700;font-size:1.125rem;line-height:1.4}

/* Bento : exactement 4 cellules */
.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:20px;margin-top:36px}
.tile{display:flex;flex-direction:column;justify-content:space-between;gap:28px;padding:32px;border-radius:var(--r);border:1px solid var(--line);background:var(--surface);color:var(--ink);text-decoration:none;min-height:220px}
.tile:hover{border-color:var(--accent);text-decoration:none}
.tile h3{font-size:1.375rem;margin:0 0 10px}
.tile p{color:var(--muted);max-width:44ch}
.tile__go{font-weight:700;color:var(--accent)}
.tile--a{grid-column:span 7;background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.tile--a p,.tile--a .tile__go{color:var(--accent-ink)}
.tile--a:hover{filter:brightness(1.08)}
.tile--b{grid-column:span 5}
.tile--c{grid-column:span 5}
.tile--d{grid-column:span 7;background:var(--tint)}

/* Bande de règle */
.rule{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:56px;align-items:start}
.rule p+p{margin-top:14px}

/* ---------- Pages intérieures ---------- */
.page-head{padding-block:56px 40px;border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:16px;max-width:22ch}
.page-head p{font-size:1.1875rem;color:var(--muted);max-width:60ch}

/* Axes du stage */
.axis{padding-block:56px;border-bottom:1px solid var(--line)}
.axis:last-of-type{border-bottom:0}
.axis__grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:56px;align-items:start}
.axis--flip .axis__grid{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.axis--flip .axis__head{order:2}
.axis--tint{background:var(--tint)}
.axis__head h2{font-size:clamp(1.5rem,2.6vw,2rem);margin-bottom:16px}
.axis__tag{font-weight:700;font-size:.9375rem;color:var(--accent);margin-bottom:10px}
.axis__body{display:flex;flex-direction:column;gap:28px}
.label{font-weight:700;font-size:.9375rem;color:var(--accent);margin-bottom:6px}
.axis__body p{max-width:62ch}

/* Colonnes simples */
.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:56px;align-items:start}
.stack{display:flex;flex-direction:column;gap:36px}
.entry{display:grid;grid-template-columns:150px minmax(0,1fr);gap:8px 32px}
.entry__date{font-weight:700;color:var(--muted);font-size:.9375rem;padding-top:3px}
.entry h3{font-size:1.1875rem;margin-bottom:6px}
.entry p{color:var(--muted)}
.entry p+p{margin-top:8px}
.levels{display:flex;flex-direction:column;gap:32px}
.level{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:8px 40px}
.level h3{font-size:1.125rem;margin:0}
.level p{color:var(--muted);font-size:.9375rem;margin-top:6px}
.chips{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-start;align-content:flex-start}
.chips li{padding:6px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);font-weight:600;font-size:.9375rem}

/* Projets */
.project{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:56px;padding-block:44px;border-top:1px solid var(--line)}
.project:first-of-type{border-top:0;padding-top:0}
.project h2{font-size:1.5rem;margin-bottom:8px}
.project__meta{color:var(--muted);font-weight:600;font-size:.9375rem}
.project__body{display:flex;flex-direction:column;gap:18px;max-width:62ch}
.project__body .label{margin-bottom:2px}
.plain-list li{padding-left:18px;position:relative;margin-bottom:8px}
.plain-list li::before{content:"";position:absolute;left:0;top:.7em;width:7px;height:2px;background:var(--accent)}

/* Étapes IA et bloc d'écart */
.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;margin-top:28px}
.box{padding:28px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.box h3{font-size:1.1875rem;margin-bottom:14px}
.box--tint{background:var(--bg)}
.box li{margin-bottom:10px;padding-left:18px;position:relative}
.box li:last-child{margin-bottom:0}
.box li::before{content:"";position:absolute;left:0;top:.7em;width:7px;height:2px;background:var(--accent)}
.note{padding:22px 24px;border-radius:var(--r);background:var(--tint);margin-top:28px;max-width:70ch}

/* Contact */
.contact-list{display:flex;flex-direction:column;gap:18px}
.contact-list dt{font-size:.9375rem;font-weight:600;color:var(--muted)}
.contact-list dd{margin:2px 0 0;font-weight:700;font-size:1.125rem}
.contact-list a{word-break:break-word}

/* ---------- Pied de page ---------- */
.footer{border-top:1px solid var(--line);padding-block:36px;margin-top:0;color:var(--muted);font-size:.9375rem}
.footer__row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px 32px}
.footer ul{display:flex;flex-wrap:wrap;gap:8px 24px}
.footer a{color:var(--ink)}

/* ---------- 404 ---------- */
.lost{min-height:70dvh;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;gap:16px;padding-block:64px}
.lost__code{font-size:clamp(4rem,12vw,8rem);font-weight:800;line-height:1;color:var(--accent)}

/* ---------- Mobile (tout ce qui est en colonnes passe en une seule colonne) ---------- */
@media (max-width:900px){
  .btn.nav__toggle{display:inline-flex}
  .nav__menu{position:absolute;left:0;right:0;top:var(--nav-h);flex-direction:column;align-items:stretch;gap:0;padding:12px 24px 20px;background:var(--bg);border-bottom:1px solid var(--line);display:none}
  .nav__menu[data-open="true"]{display:flex}
  .nav__links{flex-direction:column;align-items:stretch}
  .nav__links a{padding:14px 12px}
  .nav__tools{padding-top:8px}
  .hero{padding-block:32px 56px}
  .hero__grid{grid-template-columns:1fr;gap:36px}
  .hero__visual{justify-self:center;max-width:240px}
  .section{padding-block:56px}
  .facts{grid-template-columns:1fr;row-gap:22px}
  .bento{grid-template-columns:1fr}
  .tile--a,.tile--b,.tile--c,.tile--d{grid-column:auto;min-height:0}
  .rule,.axis__grid,.axis--flip .axis__grid,.split,.project,.level,.two{grid-template-columns:1fr;gap:24px}
  .axis--flip .axis__head{order:0}
  .entry{grid-template-columns:1fr;gap:4px}
  .axis{padding-block:44px}
}
@media (max-width:480px){
  .wrap{padding-inline:16px}
  .nav__menu{padding-inline:16px}
  .btn{white-space:normal;text-align:center}
  .hero__cta .btn{flex:1 1 100%}
}

@media (prefers-reduced-motion:reduce){
  .btn{transition:none}
}

/* Utilitaire : espace au-dessus de la liste des niveaux */
.levels--top{margin-top:36px}