/* Scilya — charte « laboratoire », commune à toutes les pages */
:root{
  --ink:#0E1B2A;
  --muted:#4A5868;
  --ground:#F5F7F6;
  --surface:#FFFFFF;
  --line:#DCE3E1;
  --teal:#0B7A6C;
  --teal-dark:#075E53;
  --teal-soft:#E3F2EF;
  --teal-light:#5EE0C8;
  --accent:#C2410C;
  --accent-dark:#9A3412;
  --night:#0E1B2A;
  --night-2:#17293B;
  --night-line:#2A3F55;
  --b1:#1D4ED8; --b1-soft:#E4EAFB; --b1-ink:#1E3A8A;
  --b2:#6D28D9; --b2-soft:#EEE7FB; --b2-ink:#4C1D95;
  --radius:18px;
  --display:'Space Grotesk', system-ui, sans-serif;
  --body:'Source Sans 3', system-ui, sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ground);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.55}
img{max-width:100%;display:block}
a{color:var(--teal)}a:hover{color:var(--teal-dark)}
[hidden]{display:none !important}
h1,h2,h3{font-family:var(--display);letter-spacing:-.01em;margin:0}
h2{font-size:clamp(28px,4vw,36px);line-height:1.15}
.wrap{max-width:1200px;margin:0 auto;padding-left:16px;padding-right:16px}
@media(min-width:640px){.wrap{padding-left:24px;padding-right:24px}}
.section{padding-top:72px;padding-bottom:24px}
.lead{margin:8px 0 28px;color:var(--muted)}
.eyebrow{font-weight:700;font-size:14px;letter-spacing:.08em;text-transform:uppercase;color:var(--teal)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:28px}
.section-head .lead{margin:8px 0 0}
.empty{color:var(--muted)}

/* Boutons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:12px 22px;border-radius:999px;text-decoration:none;border:0;font:inherit;font-weight:700;cursor:pointer}
.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{background:var(--accent-dark);color:#fff}
.btn-dark{background:var(--ink);color:#fff}.btn-dark:hover{background:#22364B;color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid #B8C4C1}.btn-ghost:hover{color:var(--ink);border-color:var(--ink)}
.btn-sm{min-height:40px;padding:8px 16px;font-size:15px}
.btns{display:flex;flex-wrap:wrap;gap:12px}

/* En-tête */
.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:8px 28px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand span{font-family:var(--display);font-weight:700;font-size:22px}
.brand:hover{color:var(--ink)}
.main-nav{display:flex;flex-wrap:wrap;gap:0 20px;flex:1 1 auto;font-weight:600;font-size:16px}
.main-nav a{color:var(--ink);text-decoration:none;padding:10px 0}
.main-nav a:hover,.main-nav a[aria-current]{color:var(--teal)}
@media(max-width:639px){
  .site-header .btn{display:none}
  .main-nav{gap:0 16px;font-size:15px}
}

/* En-tête de page intérieure */
.page-head{background:var(--surface);border-bottom:1px solid var(--line)}
.page-head .wrap{padding-top:32px;padding-bottom:32px;display:flex;flex-direction:column;gap:10px}
.page-head h1{font-size:clamp(30px,4.5vw,46px);line-height:1.1;letter-spacing:-.02em}
.page-head p{margin:0;color:var(--muted);max-width:720px}
.crumbs{font-size:14px;color:var(--muted)}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--teal)}
.tag{align-self:flex-start;font-weight:700;font-size:13px;padding:4px 12px;border-radius:999px;background:var(--teal-soft);color:var(--teal-dark)}
.tag.b1{background:var(--b1-soft);color:var(--b1-ink)}
.tag.b2{background:var(--b2-soft);color:var(--b2-ink)}

/* Vidéos (miniature puis lecteur au clic) */
.video{display:flex;flex-direction:column;gap:10px}
.video .thumb{position:relative;aspect-ratio:16/9;background:#1B2B3C;border-radius:14px;overflow:hidden;border:0;padding:0;cursor:pointer;width:100%}
.video .thumb img{width:100%;height:100%;object-fit:cover}
.video .thumb svg{position:absolute;inset:0;margin:auto}
.video iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:14px}
.video .v-title{font-weight:700}
.video .v-meta{font-size:14px;color:var(--muted)}

/* Formulaires */
.request{background:#fff;color:var(--ink);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;gap:14px}
.request h3{font-size:22px}
.request label.field{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:15px}
.request input[type=tel],.request select{font:inherit;font-weight:400;padding:11px 12px;border:1px solid #B8C4C1;border-radius:10px;background:#fff;color:var(--ink)}
.request fieldset{border:0;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:0 20px}
.request legend{font-weight:600;font-size:15px;margin-bottom:4px}
.request .choice{display:flex;align-items:center;gap:8px;min-height:44px}
.request .consent{display:flex;align-items:flex-start;gap:8px;font-size:15px;color:var(--muted)}
.request .consent input{margin-top:5px}

/* Pied de page */
.site-footer{background:var(--surface);border-top:1px solid var(--line);margin-top:72px}
.site-footer .cols{display:flex;flex-wrap:wrap;justify-content:space-between;gap:28px;padding-top:40px;padding-bottom:24px;font-size:15px}
.site-footer .cols>div,.site-footer nav{display:flex;flex-direction:column;gap:6px}
.site-footer nav a{padding:6px 0}
.site-footer .about{max-width:320px}
.site-footer .about strong{font-family:var(--display);font-size:20px}
.site-footer .about span{color:var(--muted)}
.site-footer .copy{padding-bottom:28px;font-size:14px;color:var(--muted)}
.site-footer .copy a{color:inherit;text-decoration:underline}

/* Page niveau : blocs et leçons */
.domains{display:flex;flex-wrap:wrap;gap:32px;align-items:flex-start}
.domain{flex:1 1 440px;min-width:0;display:flex;flex-direction:column;gap:16px}
.domain>h2{display:flex;align-items:center;gap:10px}
.domain>h2::before{content:"";width:12px;height:12px;border-radius:3px;background:var(--teal)}
.domain.chimie>h2::before{background:var(--accent)}
.blocs{display:flex;flex-direction:column;gap:16px}
.bloc{display:flex;flex-direction:column;gap:4px;padding:20px 24px}
.bloc h3{font-size:19px;margin-bottom:8px}
.lessons{list-style:none;margin:0;padding:0}
.lessons li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 16px;padding:12px 0;border-top:1px solid var(--line)}
.lessons .l-title{font-weight:600;flex:1 1 220px}
.lessons .l-actions{display:flex;flex-wrap:wrap;gap:8px}
.pill{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:6px 14px;border-radius:999px;font-weight:700;font-size:14px;text-decoration:none;border:1px solid var(--line);background:var(--ground);color:var(--ink)}
.pill:hover{border-color:var(--teal);color:var(--teal-dark)}
.pill svg{flex:none}
.pill.soon{background:transparent;border-style:dashed;color:var(--muted);font-weight:600}

/* Page leçon */
.lesson-tabs{display:flex;flex-wrap:wrap;gap:8px}
.lesson-tabs a{min-height:40px;display:inline-flex;align-items:center;padding:6px 16px;border-radius:999px;font-weight:700;text-decoration:none;border:1px solid var(--line);background:var(--surface);color:var(--ink)}
.lesson-tabs a[aria-current]{background:var(--ink);border-color:var(--ink);color:#fff}
.lesson-layout{display:flex;flex-wrap:wrap;gap:24px;align-items:flex-start}
.doc-list{flex:1 1 260px;max-width:100%;display:flex;flex-direction:column;gap:8px}
@media(min-width:900px){.doc-list{flex:0 0 280px}}
.doc-list button{display:flex;align-items:center;gap:10px;width:100%;min-height:48px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-weight:600;text-align:left;cursor:pointer}
.doc-list button:hover{border-color:var(--teal)}
.doc-list button[aria-pressed=true]{border-color:var(--teal);background:var(--teal-soft);color:var(--teal-dark)}
.viewer{flex:999 1 560px;min-width:0;display:flex;flex-direction:column;gap:12px}
.viewer-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}
.viewer-head strong{font-family:var(--display);font-size:20px}
.viewer iframe{width:100%;height:75vh;min-height:420px;border:1px solid var(--line);border-radius:14px;background:#fff}
.help{margin-top:48px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;background:var(--night);color:#E8EEF0;border-radius:var(--radius);padding:24px 28px}
.help strong{font-family:var(--display);font-size:22px;color:#fff;display:block}
.help span{color:#B9C6CF}