/* ===== Révision ECAM — feuille de style commune ===== */
:root{
  --bg:#0f172a; --bg2:#1e293b; --card:#ffffff; --ink:#1e293b; --ink-soft:#475569;
  --brand:#2563eb; --brand-d:#1d4ed8; --accent:#0891b2; --ok:#059669; --warn:#d97706;
  --line:#e2e8f0; --shadow:0 1px 3px rgba(0,0,0,.08),0 8px 24px rgba(0,0,0,.06);
  --maxw:900px; --radius:14px;
  /* ===== Code couleur des matières (imposé) =====
     Physique = BLEU · Maths = ROUGE · SII = JAUNE.
     Deux tons par matière : couleur vive (bordures/pastilles) + ton foncé (titres, texte). */
  --phys:#2563eb; --phys-ink:#1d4ed8;
  --math:#dc2626; --math-ink:#b91c1c;
  --sii:#eab308;  --sii-ink:#a16207;
  --am2:#0d9488;  --am2-ink:#0f766e;
  /* Variables de matière courante — surchargées par body.theme-xxx (défaut : physique/bleu) */
  --subject:var(--phys); --subject-ink:var(--phys-ink); --chip-ink:#ffffff;
}
/* ---- Thème de matière appliqué sur <body> ---- */
body.theme-phys{--subject:var(--phys); --subject-ink:var(--phys-ink); --chip-ink:#fff}
body.theme-math{--subject:var(--math); --subject-ink:var(--math-ink); --chip-ink:#fff}
body.theme-sii {--subject:var(--sii);  --subject-ink:var(--sii-ink);  --chip-ink:#3b2f00}
body.theme-am2 {--subject:var(--am2);  --subject-ink:var(--am2-ink);  --chip-ink:#fff}
*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:80px}
body{margin:0; font-family:'Segoe UI',system-ui,-apple-system,sans-serif;
  color:var(--ink); background:#f1f5f9; line-height:1.65; font-size:17px}

/* ---- Barre de navigation ---- */
.topbar{position:sticky; top:0; z-index:50; background:rgba(15,23,42,.96);
  backdrop-filter:blur(8px); color:#fff; padding:.7rem 1.2rem; display:flex;
  align-items:center; gap:1rem; box-shadow:0 2px 12px rgba(0,0,0,.2)}
.topbar a{color:#cbd5e1; text-decoration:none; font-weight:600; font-size:.95rem}
.topbar a:hover{color:#fff}
.topbar .brand{color:#fff; font-weight:800; letter-spacing:.3px}
.topbar .spacer{flex:1}

/* ---- Hero page d'accueil ---- */
.hero{background:linear-gradient(135deg,#1e293b,#0f172a); color:#fff;
  padding:3.2rem 1.5rem 2.6rem; text-align:center}
.hero h1{margin:0 0 .4rem; font-size:2.4rem; font-weight:800}
.hero p{margin:.3rem auto; max-width:640px; color:#cbd5e1; font-size:1.05rem}

/* ---- Conteneur ---- */
.wrap{max-width:var(--maxw); margin:0 auto; padding:2rem 1.2rem 5rem}
.wrap.wide{max-width:1100px}

/* ---- Séparateur d'année (accueil) ---- */
.year-divider{display:flex; align-items:center; gap:.9rem; margin:2.6rem 0 0; color:var(--ink-soft)}
.year-divider .line{flex:1; height:1px; background:var(--line)}
.year-divider .lab{font-size:.78rem; font-weight:800; letter-spacing:.08em; text-transform:uppercase;
  padding:.3rem .9rem; border-radius:20px; background:#fff; border:1px solid var(--line); white-space:nowrap}
.year-divider.am2 .lab{color:var(--am2-ink); border-color:var(--am2)}

/* ---- Cartes matières (accueil) ---- */
.subjects{display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:1.2rem; margin-top:1.6rem}
.subject{background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow);
  overflow:hidden; border-top:5px solid var(--brand); transition:transform .15s, box-shadow .15s}
.subject:hover{transform:translateY(-3px); box-shadow:0 12px 32px rgba(0,0,0,.12)}
.subject.phys{border-top-color:var(--phys)}
.subject.math{border-top-color:var(--math)}
.subject.sii{border-top-color:var(--sii)}
.subject.am2{border-top-color:var(--am2)}
.subject h2{margin:0; padding:1rem 1.2rem .3rem; font-size:1.2rem}
.subject .meta{padding:0 1.2rem .8rem; color:var(--ink-soft); font-size:.9rem}
.subject ul{list-style:none; margin:0; padding:.4rem 0 1rem}
.subject li a{display:flex; justify-content:space-between; align-items:center;
  gap:.5rem; padding:.5rem 1.2rem; text-decoration:none; color:var(--ink); font-size:.95rem;
  border-left:3px solid transparent}
.subject li a:hover{background:#f8fafc; border-left-color:var(--brand)}
.subject li a .st{font-size:.72rem; padding:.12rem .5rem; border-radius:20px; font-weight:700}
.st.done{background:#d1fae5; color:#065f46}
.st.wip{background:#fef3c7; color:#92400e}
.st.todo{background:#e2e8f0; color:#475569}

/* ---- Contenu de chapitre ---- */
.chip{display:inline-block; font-size:.75rem; font-weight:700; text-transform:uppercase;
  letter-spacing:.5px; padding:.2rem .7rem; border-radius:20px; color:var(--chip-ink); background:var(--subject)}
h1.title{font-size:2rem; margin:.6rem 0 .3rem}
.lead{color:var(--ink-soft); font-size:1.05rem; margin-bottom:1.5rem}

section.block{background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow);
  padding:1.6rem 1.8rem; margin:1.4rem 0}
section.block > h2:first-child{margin-top:0}
h2{font-size:1.5rem; color:var(--subject-ink); border-bottom:2px solid var(--line);
  padding-bottom:.4rem; margin:2rem 0 1rem}
h3{font-size:1.2rem; color:var(--subject-ink); opacity:.92; margin:1.6rem 0 .6rem}
h4{font-size:1.05rem; color:var(--ink); margin:1.2rem 0 .4rem}

/* ---- Encarts ---- */
.def,.thm,.note,.method,.exo,.warnbox{border-radius:10px; padding:.9rem 1.1rem; margin:1rem 0;
  border-left:4px solid}
.def{background:#eff6ff; border-color:var(--brand)}
.thm{background:#f5f3ff; border-color:#7c3aed}
.note{background:#f0fdfa; border-color:var(--accent)}
.method{background:#fffbeb; border-color:var(--warn)}
.warnbox{background:#fef2f2; border-color:#dc2626}
.exo{background:#f8fafc; border-color:#64748b}
.def .lab,.thm .lab,.note .lab,.method .lab,.warnbox .lab{display:block; font-weight:800;
  text-transform:uppercase; font-size:.72rem; letter-spacing:.5px; margin-bottom:.3rem; color:var(--ink-soft)}

/* ---- Correction TD ---- */
.exo-card{border:1px solid var(--line); border-radius:12px; margin:1.4rem 0; overflow:hidden}
.exo-head{background:#f1f5f9; padding:.7rem 1.1rem; font-weight:700; font-size:1.05rem;
  display:flex; align-items:center; gap:.6rem; border-bottom:1px solid var(--line)}
.exo-head .diff{font-size:.8rem; color:var(--warn)}
.exo-body{padding:.4rem 1.2rem 1rem}
.q{font-weight:700; color:var(--subject-ink); margin-top:1rem}
.enonce{font-style:italic; color:var(--ink-soft); background:#f8fafc; padding:.5rem .8rem;
  border-radius:8px; margin:.3rem 0 .6rem}
.res{background:#ecfdf5; border-left:3px solid var(--ok); padding:.4rem .8rem; margin:.6rem 0;
  border-radius:6px}
.res b{color:#065f46}

/* ---- Divers ---- */
.mono{font-family:'Consolas','SF Mono',ui-monospace,monospace; font-size:.9em; background:#f1f5f9;
  padding:.05rem .35rem; border-radius:5px; color:var(--subject-ink)}
table{border-collapse:collapse; width:100%; margin:1rem 0; font-size:.95rem}
th,td{border:1px solid var(--line); padding:.5rem .7rem; text-align:center}
th{background:#f1f5f9}
figure{margin:1rem 0; text-align:center}
figure img{max-width:100%; border:1px solid var(--line); border-radius:8px}
figure svg{max-width:100%; height:auto}
figcaption{font-size:.85rem; color:var(--ink-soft); margin-top:.3rem}
.toc-mini{background:#f8fafc; border:1px solid var(--line); border-radius:10px; padding:1rem 1.2rem; margin:1rem 0}
.toc-mini a{color:var(--subject-ink); text-decoration:none}
.toc-mini a:hover{text-decoration:underline}

/* ---- Widget interactif (ex. Bode) — mêmes classes pour toute matière ---- */
.lab-tool{background:#f8fafc; border:1px solid var(--line); border-radius:12px; padding:1.1rem 1.3rem; margin:1.2rem 0}
.lab-tool h4{margin:.1rem 0 .8rem; color:var(--subject-ink); font-size:1rem}
.ctrls{display:flex; flex-wrap:wrap; align-items:center; gap:1rem; margin-bottom:.6rem}
.ctrls .row{display:flex; align-items:center; gap:.6rem}
.ctrls label{font-size:.88rem; color:var(--ink-soft)}
.ctrls input[type=range]{width:200px; accent-color:var(--subject)}
.qval{font-weight:800; color:var(--subject-ink); min-width:3.2ch; display:inline-block}
.preset{font-size:.82rem; cursor:pointer; background:#fff; color:var(--ink);
  border:1px solid var(--line); border-radius:8px; padding:.32rem .75rem}
.preset:hover{border-color:var(--subject); color:var(--subject-ink)}
.readout{font-size:.85rem; color:var(--ink-soft); margin-top:.5rem}
.readout b{color:var(--subject-ink)}
.bode-wrap{overflow-x:auto}
.overflow{overflow-x:auto}
footer{text-align:center; color:var(--ink-soft); font-size:.85rem; padding:2rem 1rem}
mjx-container{overflow-x:auto; overflow-y:hidden; max-width:100%}
@media(max-width:600px){body{font-size:16px} .hero h1{font-size:1.8rem} section.block{padding:1.1rem}}

/* ---- Fiche mémo (récap formules + méthodes en tête de chapitre) ---- */
.memo-sheet{border:2px solid var(--subject); border-radius:14px; margin:1.2rem 0 1.6rem;
  overflow:hidden; background:#fff; box-shadow:var(--shadow)}
.memo-head{background:var(--subject); color:var(--chip-ink); font-weight:800;
  padding:.7rem 1.1rem; font-size:1.02rem; letter-spacing:.3px; display:flex; align-items:center; gap:.5rem}
.memo-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.memo-item{padding:.7rem 1rem; font-size:.9rem; border-top:1px solid var(--line); border-left:1px solid var(--line)}
.memo-item b{display:block; color:var(--subject-ink); font-size:.88rem; margin-bottom:.2rem}
.memo-item.method{background:#fffbeb}
.memo-item.method b::before{content:"⚡ "}

/* ---- Section « Documents donnés » (liens vers les PDF sources) ---- */
.docs-intro{color:var(--ink-soft); margin:.2rem 0 1.1rem}
.docs-group{margin:1.1rem 0}
.docs-group h3{margin:.6rem 0 .5rem}
.doc-list{list-style:none; margin:0; padding:0; display:grid; gap:.5rem}
.doc-list li{margin:0}
.doc-item{display:flex; align-items:center; gap:.7rem; text-decoration:none; color:var(--ink);
  background:#f8fafc; border:1px solid var(--line); border-left:4px solid var(--subject);
  border-radius:9px; padding:.6rem .85rem; font-size:.95rem; transition:background .12s, box-shadow .12s}
.doc-item:hover{background:#eef2ff; box-shadow:var(--shadow)}
.doc-item .ic{flex:none; width:1.6rem; height:1.6rem; display:grid; place-items:center;
  background:var(--subject); color:var(--chip-ink); border-radius:6px; font-size:.62rem; font-weight:800}
.doc-item .nm{flex:1; font-weight:600}
.doc-item .badge{flex:none; font-size:.68rem; font-weight:700; text-transform:uppercase; letter-spacing:.4px;
  padding:.15rem .55rem; border-radius:20px; background:var(--subject); color:var(--chip-ink); opacity:.92}
.doc-item .arrow{flex:none; color:var(--subject-ink); font-weight:800}
.docs-note{font-size:.85rem; color:var(--ink-soft); margin-top:1rem; padding-top:.7rem; border-top:1px dashed var(--line)}

/* ---- Verrou d'accès (mot de passe) ---- */
body{visibility:hidden}
#gate-overlay{position:fixed; inset:0; z-index:9999; background:#0f172a; display:flex;
  align-items:center; justify-content:center; padding:1.5rem}
.gate-box{background:#fff; border-radius:16px; padding:2.2rem 2rem; max-width:360px; width:100%;
  text-align:center; box-shadow:0 20px 60px rgba(0,0,0,.4)}
.gate-icon{font-size:2.2rem; margin-bottom:.4rem}
.gate-box h2{margin:.2rem 0 .5rem; font-size:1.3rem; color:var(--ink)}
.gate-box p{color:var(--ink-soft); font-size:.92rem; margin:0 0 1.2rem}
.gate-box input{width:100%; box-sizing:border-box; padding:.7rem .9rem; border-radius:10px;
  border:1px solid var(--line); font-size:1rem; margin-bottom:.8rem}
.gate-box button{width:100%; padding:.7rem .9rem; border:none; border-radius:10px;
  background:#0f172a; color:#fff; font-weight:700; font-size:.95rem; cursor:pointer}
.gate-box button:hover{background:#1e293b}
.gate-err{color:#dc2626; font-size:.85rem; min-height:1.1em; margin:.6rem 0 0}

/* DS test : corrections repliables */
details.sol{border:1px solid var(--line); border-radius:10px; margin:.5rem 0 1rem; background:#f8fafc}
details.sol>summary{cursor:pointer; padding:.5rem .9rem; font-weight:700; color:var(--subject-ink)}
details.sol[open]>summary{border-bottom:1px solid var(--line)}
details.sol>.sol-body{padding:.3rem 1rem .8rem}

/* sous-dossier dans une carte (ex. 1er DS) */
.subject li.sub details{margin:.2rem 0}
.subject li.sub summary{cursor:pointer; font-weight:700; padding:.55rem .9rem; color:var(--subject-ink)}
.subject li.sub ul{padding:0 0 .3rem 1.1rem}

/* ---- Quizz ALI (schémas + propriétés + quizz interactif) ---- */
.ali-tabs{display:flex;gap:.4rem;flex-wrap:wrap;margin:.6rem 0}
.ali-btn,.ali-opt{padding:.4rem .8rem;border:1px solid var(--line);background:#fff;color:inherit;border-radius:8px;cursor:pointer;font:inherit}
.ali-btn.on{background:var(--subject);color:var(--chip-ink);border-color:var(--subject);font-weight:700}
.ali-opt{display:block;width:100%;text-align:left;margin:.4rem 0}
.ali-opt:hover{background:#f1f5f9}
.ali-opt.ok{background:#dcfce7;border-color:#16a34a}
.ali-opt.ko{background:#fee2e2;border-color:#dc2626}
.ali-card{border:1px solid var(--line);border-radius:12px;padding:.8rem 1rem;margin:.6rem 0;background:#fff}
.ali-card svg{display:block;margin:auto;max-width:100%;height:auto;max-height:300px}
.ali-eq{display:block;font-family:Consolas,monospace;background:#f1f5f9;padding:.2rem .6rem;border-radius:6px;margin:.25rem 0}
.ali-card.hide .ans{filter:blur(7px);cursor:pointer;user-select:none}
.ali-test,.ali-score{font-size:.9rem;color:var(--ink-soft)}