/* Sites de niche Conversion Boosters — feuille de style commune v1 */
/* Polices hébergées sur le site (sous-ensemble latin, variables) */
@font-face{font-family:"Montserrat";src:url("fonts/montserrat-latin-wght-normal.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Source Serif 4";src:url("fonts/source-serif-4-latin-wght-normal.woff2") format("woff2");font-weight:200 900;font-style:normal;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --bleu:#1F3E59; --bleu-900:#132a3e; --bleu-700:#2a5073;
  --orange:#FF9900; --mandarine:#F08219; --poussin:#FCC826;
  --lavande:#D7D5EB; --wash:#F6F5FB; --line:#E6E4F2;
  --ink:#1f2d3b; --muted:#5b6878; --paper:#fff;
  --accent:var(--orange);
  --kicker:#A85600; /* orange texte accessible (5,3:1 sur blanc) */
  --grad:var(--flamme); --glow1:rgba(252,200,38,.34); --glow2:rgba(240,130,25,.16);
  --flamme:linear-gradient(135deg,var(--poussin),var(--mandarine));
  --f-titre:"Montserrat",system-ui,sans-serif;
  --f-texte:"Source Serif 4",Georgia,"Times New Roman",serif;
  --measure:68ch; --r:14px;
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.125rem/1.7 var(--f-texte);text-rendering:optimizeLegibility}
img,svg{max-width:100%;display:block}
a{color:var(--bleu);text-decoration-color:color-mix(in srgb,var(--accent) 70%,transparent);text-underline-offset:.2em;text-decoration-thickness:.08em;transition:text-decoration-color .2s,color .2s}
a:hover{color:var(--bleu-700);text-decoration-color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{width:min(1180px,100% - 2.5rem);margin-inline:auto}
.skip{position:absolute;left:-999px;top:.5rem;background:var(--bleu);color:#fff;padding:.5rem 1rem;z-index:99;font:600 .9rem var(--f-titre)}
.skip:focus{left:.5rem}
h1,h2,h3,h4{font-family:var(--f-titre);color:var(--bleu);line-height:1.18;letter-spacing:-.01em;text-wrap:balance}
h1{font-weight:800;font-size:clamp(2.1rem,1.2rem + 3.6vw,3.5rem);margin:.2em 0 .35em}
h2{font-weight:700;font-size:clamp(1.45rem,1.1rem + 1.2vw,1.95rem);margin:2.2em 0 .6em}
h3{font-weight:700;font-size:1.22rem;margin:1.8em 0 .4em}
p{margin:0 0 1.1em}
.kicker{display:inline-flex;align-items:center;gap:.5em;font:700 .74rem/1 var(--f-titre);letter-spacing:.14em;text-transform:uppercase;color:var(--kicker)}
.kicker::before{content:"";width:1.6em;height:3px;border-radius:3px;background:var(--grad)}
.on-dark .kicker{color:var(--poussin)}

/* En-tête */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,#fff 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:4.2rem}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--bleu);font:500 1.08rem/1 var(--f-titre);letter-spacing:-.01em}
.brand b{font-weight:800}
.brand .tld{color:var(--kicker);font-weight:700}
.mark{width:30px;height:30px;flex:none}
.nav{display:flex;gap:.3rem;font:600 .9rem var(--f-titre)}
.nav a{text-decoration:none;color:var(--bleu);padding:.55rem .8rem;border-radius:999px;position:relative}
.nav a::after{content:"";position:absolute;left:.8rem;right:.8rem;bottom:.3rem;height:2px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.nav a:hover::after,.nav a[aria-current]::after{transform:scaleX(1)}
.menu{display:none}
@media (max-width:860px){
  .nav{display:none}
  .menu{display:block;position:relative}
  .menu summary{list-style:none;cursor:pointer;font:700 .85rem var(--f-titre);color:var(--bleu);border:1px solid var(--line);border-radius:999px;padding:.55rem 1rem}
  .menu summary::-webkit-details-marker{display:none}
  .menu nav{position:absolute;right:0;top:calc(100% + .5rem);background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:0 18px 40px -18px rgba(19,42,62,.35);padding:.5rem;display:grid;min-width:14rem}
  .menu nav a{padding:.7rem .9rem;text-decoration:none;font:600 .95rem var(--f-titre);border-radius:10px}
  .menu nav a:hover{background:var(--wash)}
}

/* Hero */
.hero{position:relative;overflow:hidden;background:var(--bleu);color:#e9eff5;isolation:isolate}
.hero::before{content:"";position:absolute;inset:auto -12% -55% auto;width:62vmax;aspect-ratio:1;border-radius:50%;background:radial-gradient(closest-side,var(--glow1),var(--glow2) 45%,transparent 72%);z-index:-1}
.hero::after{content:"";position:absolute;inset:-40% auto auto -18%;width:48vmax;aspect-ratio:1;border-radius:50%;border:1px solid rgba(215,213,235,.14);box-shadow:0 0 0 7vmax rgba(215,213,235,.04),0 0 0 14vmax rgba(215,213,235,.03);z-index:-1}
.hero .wrap{padding:clamp(3rem,7vw,6rem) 0 clamp(3rem,6vw,5rem)}
.hero h1{color:#fff;max-width:16ch}
.hero .lead{font-size:clamp(1.1rem,1rem + .45vw,1.32rem);color:#d5e1ec;max-width:60ch}
.hero .meta{color:#aebfce}
.trail{position:absolute;right:4%;top:18%;width:min(38vw,460px);opacity:.9;z-index:-1}
.trail path{stroke-dasharray:6 10}
@keyframes dash{to{stroke-dashoffset:-320}}
.meta{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;font:500 .84rem/1.4 var(--f-titre);color:var(--muted)}
.meta span{display:inline-flex;align-items:center;gap:.4em}

/* Entrées animées */
.rise{animation:rise .8s var(--ease) both}
.rise.d1{animation-delay:.08s}.rise.d2{animation-delay:.16s}.rise.d3{animation-delay:.24s}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@supports (animation-timeline:view()){
  .reveal{animation:reveal linear both;animation-timeline:view();animation-range:entry 0% cover 20%}
  @keyframes reveal{from{transform:translateY(22px)}to{transform:none}}
}

/* Fil d'Ariane */
.crumbs{font:500 .82rem/1.4 var(--f-titre);color:var(--muted);padding:1.1rem 0 0}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.35rem}
.crumbs li+li::before{content:"›";margin-right:.35rem;color:var(--lavande)}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--bleu)}
.on-dark .crumbs,.on-dark .crumbs a{color:#aebfce}

/* À la une */
.une{margin-top:-2.2rem;position:relative;z-index:2}
.une a{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:1.2rem;background:#fff;border:1px solid var(--line);border-radius:calc(var(--r) + 4px);padding:1.2rem 1.4rem;text-decoration:none;box-shadow:0 22px 50px -28px rgba(19,42,62,.45);transition:transform .35s var(--ease),box-shadow .35s}
.une a:hover{transform:translateY(-3px);box-shadow:0 30px 60px -28px rgba(19,42,62,.5)}
.pill{justify-self:start;font:700 .7rem/1 var(--f-titre);letter-spacing:.12em;text-transform:uppercase;background:var(--grad);color:var(--bleu-900);padding:.55em .9em;border-radius:999px;white-space:nowrap}
.une strong{display:block;font:700 1.08rem/1.3 var(--f-titre);color:var(--bleu)}
.une small{font:500 .82rem var(--f-titre);color:var(--muted)}
.arrow{width:2.4rem;height:2.4rem;border-radius:50%;display:grid;place-items:center;background:var(--wash);color:var(--bleu);transition:background .3s,transform .3s var(--ease)}
.une a:hover .arrow,.card:hover .arrow{background:var(--orange);transform:translateX(3px)}
@media (max-width:640px){.une a{grid-template-columns:1fr}.une .arrow{display:none}}

/* Mise en page article */
.layout{display:grid;grid-template-columns:minmax(0,var(--measure)) 15rem;gap:4rem;justify-content:space-between;padding:2.5rem 0 1rem}
.layout.solo{grid-template-columns:minmax(0,var(--measure))}
.prose>h2:first-child{margin-top:.4em}
.prose h2{scroll-margin-top:6rem;position:relative}
.prose h2::before{content:"";position:absolute;left:-1.4rem;top:.45em;width:.55rem;height:.55rem;border-radius:50%;background:var(--grad)}
@media (max-width:760px){.prose h2::before{display:none}}
.prose .src{font:500 .85rem/1.5 var(--f-titre);color:var(--muted)}
.toc{position:sticky;top:6rem;align-self:start;font:500 .86rem/1.45 var(--f-titre)}
.toc p{font:700 .72rem var(--f-titre);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 .8rem}
.toc ol{list-style:none;margin:0;padding:0 0 0 1rem;border-left:2px solid var(--line);counter-reset:t}
.toc li{counter-increment:t;margin:.15rem 0}
.toc a{display:block;padding:.35rem 0;text-decoration:none;color:var(--muted);transition:color .2s,transform .2s var(--ease)}
.toc a::before{content:counter(t,decimal-leading-zero) " ";color:var(--kicker);font-weight:700}
.toc a:hover{color:var(--bleu);transform:translateX(3px)}
@media (max-width:1060px){.layout{grid-template-columns:minmax(0,var(--measure))}.toc{display:none}}

/* L'essentiel */
.essentiel{background:var(--wash);border:1px solid var(--line);border-radius:var(--r);padding:1.4rem 1.6rem 1.2rem;margin:0 0 2rem;position:relative;overflow:hidden}
.essentiel::after{content:"";position:absolute;right:-60px;top:-60px;width:160px;height:160px;border-radius:50%;background:radial-gradient(closest-side,rgba(252,200,38,.35),transparent)}
.essentiel h2{font-size:1rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 .8rem;color:var(--bleu)}
.essentiel h2::before{display:none}
.essentiel ul{margin:0;padding:0;list-style:none}
.essentiel li{padding-left:1.6rem;position:relative;margin:.45rem 0;font-size:1.02rem;line-height:1.55}
.essentiel li::before{content:"";position:absolute;left:0;top:.55em;width:.7rem;height:.7rem;border-radius:50%;border:3px solid var(--mandarine)}

/* Encadré actu */
.news{border-left:4px solid var(--orange);background:linear-gradient(90deg,#fff8ec,#fff);border-radius:0 var(--r) var(--r) 0;padding:1.2rem 1.4rem;margin:0 0 2rem}
.news h2{margin:.6rem 0 .5rem;font-size:1.3rem}
.news h2::before{display:none}

/* Thèmes (fil conducteur) */
.section{padding:clamp(3rem,6vw,5rem) 0}
.section.wash{background:var(--wash);border-block:1px solid var(--line)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:1rem;margin-bottom:2rem}
.section-head h2{margin:.35em 0 0}
.section-head p{max-width:46ch;margin:0;color:var(--muted);font-size:1rem}
.themes{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;position:relative;list-style:none;margin:0;padding:0}
.themes::before{content:"";position:absolute;left:2.2rem;right:2.2rem;top:2.15rem;border-top:2px dashed color-mix(in srgb,var(--mandarine) 55%,transparent);z-index:0}
.theme{position:relative;z-index:1}
.theme a{display:block;height:100%;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:1.2rem 1.2rem 1.3rem;transition:transform .35s var(--ease),border-color .3s,box-shadow .35s}
.theme a:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--orange) 60%,var(--line));box-shadow:0 22px 44px -30px rgba(19,42,62,.55)}
.theme .num{width:2.3rem;height:2.3rem;border-radius:50%;display:grid;place-items:center;background:var(--bleu);color:#fff;font:800 .85rem var(--f-titre);margin-bottom:1rem;box-shadow:0 0 0 5px #fff}
.theme a:hover .num{background:var(--grad);color:var(--bleu-900)}
.theme strong{display:block;font:700 1.1rem/1.25 var(--f-titre);color:var(--bleu);margin-bottom:.35rem}
.theme span:not(.num){display:block;font-size:.97rem;line-height:1.5;color:var(--muted)}
.theme em{display:block;margin-top:.9rem;font:600 .78rem var(--f-titre);font-style:normal;color:var(--kicker)}
@media (max-width:980px){.themes{grid-template-columns:repeat(2,1fr)}.themes::before{display:none}}
@media (max-width:560px){.themes{grid-template-columns:1fr}}

/* Cartes articles */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;list-style:none;margin:0;padding:0}
@media (max-width:980px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.cards{grid-template-columns:1fr}}
.card{position:relative;display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:1.4rem;transition:transform .35s var(--ease),box-shadow .35s,border-color .3s}
.card:hover{transform:translateY(-4px);box-shadow:0 24px 48px -32px rgba(19,42,62,.55);border-color:color-mix(in srgb,var(--orange) 50%,var(--line))}
.card h3{margin:.8rem 0 .5rem;font-size:1.15rem}
.card h3 a{text-decoration:none;color:var(--bleu)}
.card h3 a::after{content:"";position:absolute;inset:0;border-radius:inherit}
.card p{font-size:.98rem;line-height:1.55;color:var(--muted);margin:0 0 1.2rem}
.card .foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center}
.card.soon{background:transparent;border-style:dashed;box-shadow:none;transform:none}
.card.soon h3{color:var(--muted)}
.card.soon .kicker{color:var(--muted)}
.card.soon .kicker::before{background:var(--lavande)}
.card.feature{grid-column:span 2;background:var(--bleu);border-color:var(--bleu);color:#dbe6f0;overflow:hidden}
.card.feature h3{font-size:1.5rem}.card.feature h3 a{color:#fff}.card.feature p{color:#c9d7e4}
.card.feature .meta{color:#aebfce}.card.feature .kicker{color:var(--poussin)}
.card.feature::before{content:"";position:absolute;right:-80px;bottom:-80px;width:260px;height:260px;border-radius:50%;background:radial-gradient(closest-side,rgba(252,200,38,.35),transparent)}
@media (max-width:620px){.card.feature{grid-column:auto}}

/* Sources, auteur, à lire aussi */
.sources{border-top:1px solid var(--line);margin-top:2.5rem;padding-top:1.2rem;font:500 .9rem/1.55 var(--f-titre);color:var(--muted)}
.sources h2{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;margin:0 0 .6rem}
.sources h2::before{display:none}
.sources ol{margin:0;padding-left:1.2rem}
.author{display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:center;background:var(--wash);border-radius:var(--r);padding:1.2rem 1.4rem;margin:2rem 0 0}
.author .avatar{width:3.2rem;height:3.2rem;border-radius:50%;background:var(--bleu);display:grid;place-items:center}
.author p{margin:0;font:400 .95rem/1.55 var(--f-texte);color:var(--muted)}
.author strong{display:block;font:700 .95rem var(--f-titre);color:var(--bleu);margin-bottom:.15rem}

/* Page de thème */
.hub-hero{background:var(--wash);border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hub-hero::after{content:"";position:absolute;right:-8%;top:-40%;width:40vmax;aspect-ratio:1;border-radius:50%;border:2px dashed color-mix(in srgb,var(--mandarine) 35%,transparent)}
.hub-hero .wrap{padding:1rem 0 3rem;position:relative;z-index:1}
.hub-hero .lead{max-width:62ch;font-size:1.18rem;color:#3b4a59}
.count{font:600 .85rem var(--f-titre);color:var(--kicker)}

/* Pied de page */
.site-footer{background:var(--bleu-900);color:#b7c6d4;font:400 .92rem/1.6 var(--f-titre);margin-top:4rem}
.site-footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2.5rem;padding:3.5rem 0 2rem}
.site-footer h2{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:#fff;margin:0 0 .9rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.3rem 0}
.site-footer a{color:#dbe6f0;text-decoration:none}
.site-footer a:hover{color:var(--poussin)}
.site-footer .brand{color:#fff;margin-bottom:1rem}
.site-footer .brand .tld{color:var(--poussin)}
.fcg .site-footer .brand .tld{color:#A3CDE4}
.site-footer .legal{grid-column:1/-1;border-top:1px solid rgba(215,213,235,.15);padding-top:1.2rem;display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem;font-size:.82rem;color:#8fa3b6}
@media (max-width:760px){.site-footer .wrap{grid-template-columns:1fr}}

/* Progression de lecture (navigateurs compatibles) */
.progress{position:fixed;left:0;top:0;height:3px;width:100%;background:var(--grad);transform-origin:left;transform:scaleX(0);z-index:60}
@supports (animation-timeline:scroll()){.progress{animation:grow linear both;animation-timeline:scroll(root)}}
@keyframes grow{to{transform:scaleX(1)}}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* Variante formationchatgpt.com */
.fcg{--kicker:#2B6A9A;--grad:linear-gradient(135deg,#A3CDE4,#4A8DC0);--glow1:rgba(163,205,228,.32);--glow2:rgba(74,141,192,.16)}
.fcg .brand .tld{color:#2B6A9A}
.fcg .on-dark .kicker{color:#A3CDE4}
.fcg .news{border-left-color:#4A8DC0;background:linear-gradient(90deg,#eef6fb,#fff)}
.fcg .essentiel li::before{border-color:#4A8DC0}
.fcg .themes::before{border-top-color:color-mix(in srgb,#4A8DC0 55%,transparent)}
.fcg .hub-hero::after{border-color:color-mix(in srgb,#4A8DC0 35%,transparent)}
.fcg .trail path{stroke:#A3CDE4}
.fcg .trail circle{fill:#4A8DC0}
.fcg .card.feature::before,.fcg .essentiel::after{background:radial-gradient(closest-side,rgba(163,205,228,.4),transparent)}

.theme .tile{display:block;height:100%;background:transparent;border:1px dashed var(--line);border-radius:var(--r);padding:1.2rem 1.2rem 1.3rem}
.theme .tile .num{background:var(--lavande);color:var(--bleu)}
.prose ul{padding-left:1.3rem}.prose li{margin:.3rem 0}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}