/* Fiches méthode de maths — mathovore.fr/methodes-maths/
   Charte propre à ce dossier : encre bleu nuit, papier blanc, une couleur par
   niveau (--lvl), typo Space Grotesk pour les titres et Karla pour le texte.
   Toutes les classes du contenu sont préfixées mm-. */

:root{
  --encre:#101828;
  --encre-2:#475467;
  --trait:#E4E7EC;
  --trait-2:#F2F4F7;
  --papier:#FFFFFF;
  --fond:#F8FAFC;
  --lvl:#2563EB;
  --r:14px;
  --ombre:0 1px 2px rgba(16,24,40,.06), 0 6px 20px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--fond);color:var(--encre);
  font-family:"Karla",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:18px;line-height:1.65;overflow-x:hidden;
}
img{max-width:100%}
a{color:#1D4ED8}
h1,h2,h3,h4{font-family:"Space Grotesk",system-ui,sans-serif;line-height:1.2;letter-spacing:-.01em}
.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}

/* ---------------------------------------------------------- barre de menu */
.topbar{background:var(--encre);padding:0}
.levels-nav{
  max-width:1160px;margin:0 auto;padding:8px 16px;
  display:flex;align-items:center;gap:2px;flex-wrap:wrap;justify-content:flex-start;
}
.levels-nav a{
  display:inline-block;padding:6px 11px;border-radius:999px;
  color:#E6EAF2;text-decoration:none;font-weight:600;font-size:.86rem;
}
.levels-nav a:hover{background:rgba(255,255,255,.12)}
.nv-brand{
  font-family:"Space Grotesk",sans-serif;font-weight:700;letter-spacing:.12em;
  background:linear-gradient(90deg,#F97316,#E11D48,#8B5CF6,#2563EB,#059669);
  color:#fff !important;margin-right:6px;
}
.nv-home{box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.35)}
.levels-nav a[style*="--c"]{color:#fff}
.levels-nav a.is-current{background:var(--c,#fff);color:#fff !important}
/* le lien Accueil n'a pas de couleur de niveau : blanc sur blanc, il disparaissait */
.levels-nav a.nv-home.is-current{background:#fff;color:#101828 !important;box-shadow:none}
.topbar .google-auto-placed{display:none !important}

/* ---------------------------------------------------------- fil d'Ariane */
.crumbs{max-width:1160px;margin:0 auto;padding:12px 16px 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:.82rem;color:var(--encre-2)}
.crumbs li+li::before{content:"›";margin-right:6px;color:#98A2B3}
.crumbs a{color:var(--encre-2);text-decoration:none}
.crumbs a:hover{text-decoration:underline}

/* ---------------------------------------------------------- accueil */
main{max-width:1160px;margin:0 auto;padding:0 16px 56px}
.hero{padding:40px 0 8px;max-width:820px}
.hero-kicker{
  display:inline-block;margin:0 0 14px;padding:5px 12px;border-radius:999px;
  background:#EEF2FF;color:#3730A3;font-weight:700;font-size:.78rem;letter-spacing:.02em;
}
.hero h1{font-size:clamp(1.9rem,4.6vw,3rem);margin:0 0 14px}
.hero h1 strong{
  background:linear-gradient(90deg,#2563EB,#7C3AED);-webkit-background-clip:text;
  background-clip:text;color:transparent;
}
.hero-text{color:var(--encre-2);font-size:1.06rem;margin:0}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0 0}
.hero-cta a{
  display:inline-block;padding:11px 20px;border-radius:999px;background:var(--encre);
  color:#fff;text-decoration:none;font-weight:700;font-size:.92rem;
}
.hero-cta a.ghost{background:#fff;color:var(--encre);box-shadow:inset 0 0 0 1.5px var(--trait)}
.hero-cta a:hover{opacity:.9}

.mm-grille{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));margin:34px 0 0}
.mm-niveau{background:var(--papier);border-radius:var(--r);box-shadow:var(--ombre);padding:16px;display:flex;flex-direction:column;border-top:4px solid var(--c)}
.mm-niveau-tete{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit}
.mm-niveau-tete strong{display:block;font-family:"Space Grotesk",sans-serif;font-size:1.15rem}
.mm-niveau-tete small{color:var(--encre-2);font-size:.85rem}
.mm-puce{
  flex:none;display:grid;place-items:center;width:52px;height:52px;border-radius:14px;
  background:var(--c,var(--lvl));color:#fff;font-family:"Space Grotesk",sans-serif;
  font-weight:700;font-size:1.1rem;
}
.mm-apercu{list-style:none;margin:14px 0 10px;padding:0;flex:1}
.mm-apercu li{border-top:1px solid var(--trait-2);padding:8px 0}
.mm-apercu a{color:var(--encre);text-decoration:none;font-size:.93rem}
.mm-apercu a:hover{color:var(--c);text-decoration:underline}
.mm-niveau-tout{color:var(--c);font-weight:700;text-decoration:none;font-size:.9rem}

.about{max-width:820px;margin:48px 0 0}
.about h2{font-size:1.35rem;margin:28px 0 8px}
.about p{color:var(--encre-2);margin:0}

/* ---------------------------------------------------------- page niveau */
.niveau-hero{display:flex;gap:18px;align-items:flex-start;padding:30px 0 8px;max-width:900px}
.niveau-hero .mm-puce{width:64px;height:64px;font-size:1.3rem;background:var(--lvl)}
.niveau-hero h1{font-size:clamp(1.6rem,3.6vw,2.3rem);margin:0 0 8px}
.niveau-hero p{color:var(--encre-2);margin:0;font-size:1rem}
.mm-cartes{list-style:none;margin:26px 0 0;padding:0;display:grid;gap:12px}
.mm-carte{
  display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;
  background:var(--papier);border-radius:var(--r);box-shadow:var(--ombre);
  padding:14px 16px;text-decoration:none;color:inherit;border-left:4px solid var(--lvl);
}
.mm-carte:hover{transform:translateY(-1px);box-shadow:0 2px 4px rgba(16,24,40,.08),0 12px 26px rgba(16,24,40,.09)}
.mm-carte-num{font-family:"Space Grotesk",sans-serif;font-weight:700;color:var(--lvl);font-size:1.1rem;opacity:.5}
.mm-carte-titre{display:block;font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:1.05rem}
.mm-carte-desc{display:block;color:var(--encre-2);font-size:.9rem;margin-top:2px}
.mm-carte-chap{
  flex:none;font-size:.74rem;font-weight:700;color:var(--lvl);background:color-mix(in srgb,var(--lvl) 10%,#fff);
  padding:4px 10px;border-radius:999px;white-space:nowrap;
}
.siblings{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:28px 0 0}
.sib{
  display:inline-block;padding:10px 16px;border-radius:999px;background:var(--papier);
  box-shadow:var(--ombre);color:var(--c);font-weight:700;text-decoration:none;font-size:.9rem;
}

/* ---------------------------------------------------------- fiche */
.fiche{display:grid;grid-template-columns:260px minmax(0,1fr);gap:26px;align-items:start;padding-top:18px}
.side{
  position:sticky;top:14px;background:var(--papier);border-radius:var(--r);
  box-shadow:var(--ombre);padding:12px 14px;
}
.side-title{
  cursor:pointer;font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:.92rem;
  display:flex;align-items:center;gap:8px;list-style:none;
}
.side-title::-webkit-details-marker{display:none}
.side-title .dot{width:9px;height:9px;border-radius:50%;background:var(--lvl);flex:none}
.side-toc{list-style:none;margin:10px 0 0;padding:0;max-height:62vh;overflow:auto}
.side-toc li{border-top:1px solid var(--trait-2)}
.side-toc a{display:block;padding:7px 2px;color:var(--encre-2);text-decoration:none;font-size:.88rem}
.side-toc a:hover{color:var(--lvl)}
.side-toc li.is-current a{color:var(--lvl);font-weight:700}

.fiche article{background:var(--papier);border-radius:var(--r);box-shadow:var(--ombre);padding:26px clamp(16px,3.4vw,38px) 30px;min-width:0}
.mm-kicker{margin:0 0 6px;color:var(--encre-2);font-size:.82rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em}
.fiche h1{font-size:clamp(1.55rem,3.4vw,2.2rem);margin:0 0 16px}
.fiche h2{font-size:1.3rem;margin:34px 0 12px;padding-top:4px}
.fiche h3{font-size:1.02rem;margin:0 0 6px}
.fiche p{margin:0 0 12px}

.mm-bref{
  border-left:4px solid var(--lvl);background:color-mix(in srgb,var(--lvl) 6%,#fff);
  border-radius:0 var(--r) var(--r) 0;padding:14px 18px;margin:0 0 6px;
}
.mm-bref-lab{
  display:block;font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:.74rem;
  text-transform:uppercase;letter-spacing:.08em;color:var(--lvl);margin-bottom:4px;
}
.mm-bref p{margin:0;font-size:1.02rem}

/* étapes */
.mm-etapes{list-style:none;margin:0;padding:0;counter-reset:etape}
.mm-etape{position:relative;padding:0 0 18px 52px}
.mm-etape::before{
  content:"";position:absolute;left:17px;top:34px;bottom:0;width:2px;background:var(--trait);
}
.mm-etape:last-child{padding-bottom:0}
.mm-etape:last-child::before{display:none}
.mm-num{
  position:absolute;left:0;top:-2px;width:36px;height:36px;border-radius:50%;
  background:var(--lvl);color:#fff;display:grid;place-items:center;
  font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:1rem;
}
.mm-etape h3{font-size:1.06rem;margin:4px 0 6px;min-height:30px;display:flex;align-items:center}
.mm-etape-corps{color:var(--encre-2)}
.mm-etape-corps p{margin:0 0 8px}
.mm-etape-corps :last-child{margin-bottom:0}

/* exemple résolu */
.mm-exemple{
  margin-top:34px;border:1px solid var(--trait);border-radius:var(--r);padding:4px 18px 18px;
  background:
    linear-gradient(#fff,#fff) padding-box,
    repeating-linear-gradient(0deg,#F7F9FC,#F7F9FC 1px,transparent 1px,transparent 26px);
}
.mm-exemple h2{margin-top:18px}
.mm-enonce{background:var(--trait-2);border-radius:10px;padding:12px 14px;margin:0 0 16px}
.mm-enonce p{margin:0}
.mm-tag{
  display:inline-block;margin-right:8px;padding:2px 9px;border-radius:999px;background:var(--encre);
  color:#fff;font-family:"Space Grotesk",sans-serif;font-size:.7rem;font-weight:700;
  text-transform:uppercase;letter-spacing:.06em;vertical-align:1px;
}
.mm-ex-etape{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;margin:0 0 12px}
.mm-ex-lab{
  font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:.78rem;color:var(--lvl);
  background:color-mix(in srgb,var(--lvl) 10%,#fff);padding:3px 9px;border-radius:8px;
  height:fit-content;white-space:nowrap;
}
.mm-ex-etape p{margin:0 0 6px}
.mm-conclusion{
  margin:16px 0 0;padding:12px 14px;border-radius:10px;
  background:color-mix(in srgb,var(--lvl) 8%,#fff);border:1px dashed color-mix(in srgb,var(--lvl) 40%,#fff);
}

/* pièges */
.mm-pieges ul{list-style:none;margin:0;padding:0}
.mm-pieges li{
  position:relative;padding:10px 14px 10px 44px;margin:0 0 8px;border-radius:10px;
  background:#FEF3F2;color:#7A271A;
}
.mm-pieges li::before{
  content:"✗";position:absolute;left:14px;top:10px;font-weight:700;color:#D92D20;
}

/* exercices */
.mm-exos-intro{color:var(--encre-2);font-size:.95rem}
.mm-exo-liste{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.mm-exo{border:1px solid var(--trait);border-radius:var(--r);overflow:hidden}
.mm-exo-enonce{padding:14px 16px}
.mm-exo-enonce p{margin:0}
.mm-exo-num{
  display:inline-block;margin-right:10px;padding:2px 10px;border-radius:999px;
  background:var(--lvl);color:#fff;font-family:"Space Grotesk",sans-serif;
  font-size:.74rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;vertical-align:1px;
}
.mm-corrige summary{
  cursor:pointer;list-style:none;padding:10px 16px;background:var(--trait-2);
  font-weight:700;font-size:.9rem;color:var(--encre-2);
}
.mm-corrige summary::-webkit-details-marker{display:none}
.mm-corrige summary::before{content:"▸ ";color:var(--lvl)}
.mm-corrige[open] summary::before{content:"▾ "}
.mm-corrige summary:hover{color:var(--lvl)}
.mm-corrige-corps{padding:14px 16px;border-top:1px solid var(--trait);background:#FCFDFF}
.mm-corrige-corps p{margin:0 0 10px}
.mm-corrige-corps :last-child{margin-bottom:0}

/* FAQ */
.mm-faq-item{border-bottom:1px solid var(--trait-2)}
.mm-faq-item summary{cursor:pointer;list-style:none;padding:12px 0;display:flex;gap:10px;align-items:baseline}
.mm-faq-item summary::-webkit-details-marker{display:none}
.mm-faq-item summary::before{content:"＋";color:var(--lvl);font-weight:700}
.mm-faq-item[open] summary::before{content:"−"}
.mm-faq-item summary h3{display:inline;margin:0;font-size:1rem}
.mm-faq-a{padding:0 0 14px 26px;color:var(--encre-2)}
.mm-faq-a p{margin:0 0 10px}

/* téléchargement PDF */
.mm-pdfbar{
  margin:30px 0 0;padding:16px;border-radius:var(--r);text-align:center;
  background:color-mix(in srgb,var(--lvl) 7%,#fff);border:1px solid color-mix(in srgb,var(--lvl) 25%,#fff);
}
.mm-btn-pdf{
  display:inline-block;padding:12px 22px;border-radius:999px;background:var(--lvl);
  color:#fff;text-decoration:none;font-weight:700;font-size:.96rem;
}
.mm-btn-pdf::before{content:"↓ ";font-weight:700}
.mm-btn-pdf:hover{opacity:.9}
.mm-pdfhint{display:block;margin-top:8px;color:var(--encre-2);font-size:.85rem}

/* maillage : ressources du site */
.mm-ressources{margin-top:36px}
.mm-r-intro{color:var(--encre-2);font-size:.95rem}
.mm-r-grille{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.mm-ressource{
  display:block;padding:14px;border-radius:var(--r);text-decoration:none;color:inherit;
  background:var(--trait-2);border:1px solid var(--trait);
}
.mm-ressource:hover{border-color:var(--lvl);background:#fff}
.mm-r-type{
  display:block;font-family:"Space Grotesk",sans-serif;font-size:.74rem;font-weight:700;
  text-transform:uppercase;letter-spacing:.06em;color:var(--lvl);margin-bottom:4px;
}
.mm-r-titre{display:block;font-weight:700;font-size:.96rem;line-height:1.3}
.mm-r-pitch{display:block;color:var(--encre-2);font-size:.85rem;margin-top:4px}

/* autres méthodes + navigation */
.mm-voisines{margin-top:34px}
.mm-voisines ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.mm-voisines a{
  display:block;padding:11px 14px;border-radius:10px;background:var(--trait-2);
  color:var(--encre);text-decoration:none;font-size:.93rem;font-weight:600;
}
.mm-voisines a:hover{background:color-mix(in srgb,var(--lvl) 12%,#fff);color:var(--lvl)}
.prevnext{display:flex;justify-content:space-between;gap:12px;margin:34px 0 0;flex-wrap:wrap}
.pn{
  flex:1 1 240px;padding:12px 16px;border-radius:var(--r);background:var(--trait-2);
  text-decoration:none;color:var(--encre);font-weight:700;font-size:.94rem;
}
.pn small{display:block;font-weight:600;font-size:.74rem;color:var(--encre-2);text-transform:uppercase;letter-spacing:.05em;margin-bottom:2px}
.pn.next{text-align:right}
.pn:hover{background:color-mix(in srgb,var(--lvl) 12%,#fff)}

/* plan du site */
.plan h1{font-size:clamp(1.6rem,3.4vw,2.2rem);margin:24px 0 6px}
.plan-intro{color:var(--encre-2);margin:0 0 24px}
.plan section{background:var(--papier);border-radius:var(--r);box-shadow:var(--ombre);padding:16px 18px;margin:0 0 14px;border-left:4px solid var(--c)}
.plan h2{font-size:1.15rem;margin:0 0 10px}
.plan h2 a{color:var(--c);text-decoration:none}
.plan h2 small{color:var(--encre-2);font-weight:400;font-size:.8rem}
.plan ul{list-style:none;margin:0;padding:0;columns:2;column-gap:26px}
.plan li{break-inside:avoid;padding:4px 0;font-size:.93rem}
.plan a{color:var(--encre);text-decoration:none}
.plan a:hover{color:var(--c);text-decoration:underline}

/* pied de page */
.footer{background:var(--encre);color:#C5CCDA;margin-top:40px;padding:26px 16px}
.footer p{max-width:1160px;margin:0 auto 8px;font-size:.9rem}
.footer a{color:#fff}

/* formules */
mjx-container{overflow-x:auto;overflow-y:hidden;max-width:100%}
mjx-container[display="true"]{margin:12px 0 !important}

/* ---------------------------------------------------------- responsive */
@media (max-width:980px){
  .fiche{grid-template-columns:1fr}
  .side{position:static}
  .side-toc{max-height:none}
  .plan ul{columns:1}
}
@media (max-width:640px){
  body{font-size:17px}
  .mm-carte{grid-template-columns:auto 1fr}
  .mm-carte-chap{display:none}
  .mm-ex-etape{grid-template-columns:1fr;gap:4px}
  .mm-ex-lab{justify-self:start}
  .fiche article{padding:20px 14px 24px}
  .mm-etape{padding-left:46px}
}

/* impression : la fiche seule, corrigés dépliés */
@media print{
  .topbar,.crumbs,.side,.mm-voisines,.prevnext,.footer,.mv-logo-bandeau,.mm-ressources,.mm-pdfbar{display:none !important}
  body{background:#fff;font-size:12pt}
  .fiche{display:block}
  .fiche article{box-shadow:none;padding:0}
  .mm-corrige[open] summary,.mm-corrige summary{background:none;padding-left:0}
  .mm-corrige:not([open]) .mm-corrige-corps{display:block}
}