:root{
  --red:#E1251B; --red-700:#B81C14; --red-050:#FDECEB; --red-on-dark:#FF6B61;
  --ink:#1A1A1C; --ink-2:#4A4B4E; --graphite:#6D6E71; --ink-4:#8A8B8E;
  --paper:#FFFFFF; --paper-2:#FAFAF8; --dark:#2A2B2E; --on-dark-2:#D6D6D8;
  --line:#E7E5E0; --line-strong:#D6D3CC;
  --focus:0 0 0 3px rgba(225,37,27,.28);
  --shadow-card:0 12px 32px rgba(26,26,28,.08);
  --shadow-red:0 8px 24px rgba(225,37,27,.28);
  --r-md:8px; --r-lg:14px;
  --f-display:Montserrat,sans-serif; --f-body:Inter,system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);-webkit-font-smoothing:antialiased}
input,select,textarea,button{font:inherit}
a{color:var(--red);text-decoration:none}
a:hover{color:var(--red-700);text-decoration:underline}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.red{color:var(--red)}
.muted{margin:0;font-size:15px;color:var(--graphite)}

/* Header */
.hdr{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.hdr__in{padding-top:14px;padding-bottom:14px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.hdr__logo{height:40px;display:block}
.hdr__nav{display:flex;align-items:center;gap:20px}
.hdr__back{color:var(--ink-2);font-size:14px;font-weight:500}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:0;border-radius:var(--r-md);background:var(--red);color:#fff;font-weight:700;cursor:pointer;text-decoration:none;transition:background .2s,box-shadow .2s,transform .1s}
.btn:hover{background:var(--red-700);color:#fff;text-decoration:none;box-shadow:var(--shadow-red)}
.btn:active{transform:scale(.98)}
.btn:focus-visible{outline:none;box-shadow:var(--focus)}
.btn:disabled{opacity:.4;pointer-events:none}
.btn--sm{padding:10px 18px;font-size:14px;font-weight:600}
.btn--sm:hover{box-shadow:none}
.btn--lg{height:54px;padding:0 26px;font-size:16px;width:100%}
.btn--inline{width:auto}
.btn--dark{background:var(--ink);padding:12px 18px;font-size:14px;font-weight:600}
.btn--dark:hover{background:#333336;box-shadow:none}
.btn--ghost{background:transparent;border:1px solid var(--line-strong);color:var(--ink);padding:12px 18px;font-size:14px;font-weight:600}
.btn--ghost:hover{background:rgba(26,26,28,.04);color:var(--ink);box-shadow:none}

/* Type */
.eyebrow{display:flex;align-items:center;gap:12px;font-size:12px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--red)}
.eyebrow--dark{color:var(--red-on-dark)}
.eyebrow__rule{width:24px;height:2px;background:var(--red)}
.h-display{margin:0;font-family:var(--f-display);font-weight:900;font-size:clamp(36px,5vw,60px);line-height:1;letter-spacing:-.02em;text-transform:uppercase;text-wrap:balance}
.h-display--md{font-size:clamp(32px,4vw,48px)}
.h-section{margin:0;font-family:var(--f-display);font-weight:900;font-size:clamp(28px,3.6vw,42px);line-height:1.05;letter-spacing:-.02em;text-transform:uppercase;text-wrap:balance}
.h-card{margin:0;font-family:var(--f-display);font-weight:800;font-size:24px;letter-spacing:-.01em;text-transform:uppercase}
.lead{margin:0;font-size:19px;line-height:1.6;color:var(--ink-2);max-width:58ch;text-wrap:pretty}
.body{margin:0;font-size:16px;line-height:1.6;color:var(--ink-2)}

/* Hero */
.hero{background:var(--paper-2);border-bottom:1px solid var(--line)}
.hero__grid{padding-top:72px;padding-bottom:88px;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,460px),1fr));gap:56px;align-items:start}
.hero__copy{display:flex;flex-direction:column;gap:28px}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.fact{background:#fff;padding:18px 20px;display:flex;flex-direction:column;gap:4px}
.fact__k{font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--graphite)}
.fact__v{font-weight:700;font-size:16px}
.fact__s{font-size:14px;color:var(--graphite)}
.speaker{display:flex;align-items:center;gap:16px;padding-top:4px}
/* Avatar recadré depuis l'affiche — à remplacer par une vraie photo portrait si disponible */
.speaker__avatar{width:64px;height:64px;border-radius:999px;background:url('../assets/affiche-webinaire-gptw.webp') 70% 22%/520%;border:2px solid #fff;box-shadow:0 1px 3px rgba(26,26,28,.12);flex-shrink:0}
.speaker__txt{display:flex;flex-direction:column;gap:2px}
.speaker__with{font-size:13px;color:var(--graphite)}
.speaker__name{font-family:var(--f-display);font-weight:800;font-size:20px;letter-spacing:-.01em}
.speaker__role{font-size:14px;color:var(--ink-2)}

/* Form card */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-card);padding:32px;scroll-margin-top:96px}
.form{display:flex;flex-direction:column;gap:18px}
.form__head{display:flex;flex-direction:column;gap:6px}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
.field{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--ink-2)}
.field input,.field select,.field textarea{height:46px;padding:0 14px;border:1px solid var(--line-strong);border-radius:var(--r-md);font-size:15px;color:var(--ink);background:#fff;outline:none;transition:border-color .2s,box-shadow .2s}
.field select{padding:0 12px}
.field textarea{height:auto;padding:12px 14px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--red);box-shadow:var(--focus)}
.field .is-invalid,.field [aria-invalid="true"]{border-color:var(--red)}
.opt{font-weight:400;color:var(--ink-4)}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:13px;line-height:1.5;color:var(--ink-2);cursor:pointer}
.consent input{margin-top:3px;width:16px;height:16px;accent-color:var(--red);flex-shrink:0}
.form__error{margin:0;font-size:14px;color:var(--red-700)}

/* Success */
.success{display:flex;flex-direction:column;gap:20px}
.success[hidden],.form[hidden]{display:none}
.success__mark{width:48px;height:48px;border-radius:999px;background:var(--red-050);color:var(--red);display:flex;align-items:center;justify-content:center;font-family:var(--f-display);font-weight:900;font-size:28px}
.success__when{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:16px 0;display:flex;flex-direction:column;gap:4px;font-size:15px}
.success__actions{display:flex;gap:12px;flex-wrap:wrap}

/* Programme */
.programme .wrap{padding-top:96px;padding-bottom:96px;display:flex;flex-direction:column;gap:48px}
.sec-head{display:flex;flex-direction:column;gap:14px;max-width:720px}
.points{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:24px}
.point{border-top:2px solid var(--ink);padding-top:20px;display:flex;flex-direction:column;gap:10px}
.point__n{font-family:var(--f-display);font-weight:900;font-size:28px;color:var(--red)}
.point h3{margin:0;font-size:18px;font-weight:700;line-height:1.3}
.point p{margin:0;font-size:15px;line-height:1.6;color:var(--ink-2);text-wrap:pretty}

/* Intervenant */
.intervenant{background:var(--dark);color:#fff}
.intervenant__grid{padding-top:96px;padding-bottom:96px;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr));gap:56px;align-items:center}
.poster{width:100%;height:auto;max-width:520px;aspect-ratio:1/1;object-fit:cover;border-radius:var(--r-lg);display:block}
.intervenant__txt{display:flex;flex-direction:column;gap:20px}
.intervenant__role{margin:0;font-size:17px;font-weight:600}
.intervenant__bio{margin:0;font-size:17px;line-height:1.7;color:var(--on-dark-2);max-width:56ch;text-wrap:pretty}
.intervenant .btn{margin-top:8px}
.intervenant .btn:hover{box-shadow:0 8px 24px rgba(225,37,27,.35)}

/* Footer */
.ftr{border-top:1px solid var(--line)}
.ftr__in{padding-top:32px;padding-bottom:32px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--graphite)}
.ftr__logo{height:32px;display:block}

@media (max-width:560px){
  .hdr__back{display:none}
  .hero__grid{padding-top:48px;padding-bottom:64px;gap:40px}
  .card{padding:24px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* Honeypot anti-spam */
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.ftr a{color:inherit}
.consent a{color:var(--red)}