:root{
  --bg:#E8EDEA;
  --surface:#F6F8F6;
  --ink:#1B2540;
  --muted:#5A6479;
  --line:#CBD4CF;
  --accent:#243B73;
  --accent-ink:#fff;
  --good:#2F7D4F;
  --bad:#B63A2E;
  --radius:10px;
  --font:"Hiragino Sans","Noto Sans JP","Segoe UI",system-ui,-apple-system,Roboto,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.6}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 12px;border-radius:6px;z-index:10}
.skip:focus{left:8px}
:focus-visible{outline:3px solid #E0A526;outline-offset:2px;border-radius:4px}
a{color:var(--accent)}
button{font:inherit;color:inherit;cursor:pointer}

/* header */
.top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;padding:14px clamp(16px,4vw,48px);border-bottom:1px solid var(--line);background:var(--surface);position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.top nav{display:flex;flex-wrap:wrap;gap:4px}
.top nav a{padding:6px 12px;border-radius:999px;text-decoration:none;color:var(--muted);font-weight:600;font-size:.95rem}
.top nav a:hover{color:var(--ink);background:var(--bg)}
.top nav a[aria-current="page"]{background:var(--ink);color:#fff}
.badge{display:inline-block;min-width:1.4em;padding:0 .4em;margin-left:4px;border-radius:999px;background:#E0A526;color:#1B2540;font-size:.8rem;text-align:center;line-height:1.5}

main{max-width:980px;margin:0 auto;padding:clamp(20px,4vw,48px) clamp(16px,4vw,32px) 64px;outline:none}
.foot{max-width:980px;margin:0 auto;padding:24px clamp(16px,4vw,32px) 48px;color:var(--muted);font-size:.9rem;display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;border-top:1px solid var(--line)}
.foot p{margin:0}
.link{background:none;border:0;padding:0;text-decoration:underline;color:var(--muted)}

/* type */
h1{font-size:clamp(2rem,6vw,3.6rem);line-height:1.05;letter-spacing:-.03em;margin:0 0 .4em;font-weight:800}
h2{font-size:1.5rem;letter-spacing:-.015em;margin:1.6em 0 .5em;line-height:1.2}
h3{font-size:1.1rem;margin:1.2em 0 .3em}
p{margin:.6em 0;max-width:68ch}
.lead{font-size:1.2rem;color:var(--muted);max-width:56ch}

/* hero */
.hero{display:grid;grid-template-columns:1fr auto;gap:24px 40px;align-items:center;padding-bottom:28px}
.enso{width:clamp(110px,22vw,200px);height:auto;color:var(--ink)}
.enso circle{stroke-dashoffset:0;animation:draw 1.6s cubic-bezier(.3,.7,.2,1) both}
@keyframes draw{from{stroke-dashoffset:270}to{stroke-dashoffset:0}}
@media (max-width:640px){.hero{grid-template-columns:1fr}.enso{order:-1;width:96px}}

.belt{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:20px}
.belt-bar{height:14px;width:min(320px,100%);border-radius:999px;background:var(--line);overflow:hidden}
.belt-bar i{display:block;height:100%;background:var(--beltc,#fff);border-right:1px solid rgba(0,0,0,.2)}
.belt strong{font-weight:800}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:999px;border:2px solid var(--ink);background:var(--ink);color:#fff;font-weight:700;text-decoration:none}
.btn:hover{background:var(--accent);border-color:var(--accent)}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.small{padding:5px 14px;font-size:.9rem;border-width:1.5px}

/* path (modules) */
.path{list-style:none;margin:8px 0 0;padding:0;position:relative}
.path::before{content:"";position:absolute;left:23px;top:24px;bottom:24px;width:3px;background:var(--line);border-radius:2px}
.path li{position:relative;padding:14px 0 14px 70px}
.path .num{position:absolute;left:0;top:14px;width:48px;height:48px;border-radius:50%;background:var(--mc);color:#fff;display:grid;place-items:center;font-weight:800;font-size:1.2rem;box-shadow:0 0 0 6px var(--bg)}
.path a.title{font-size:1.3rem;font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.path a.title:hover{text-decoration:underline;text-decoration-color:var(--mc);text-decoration-thickness:3px;text-underline-offset:4px}
.path .sub{margin:.1em 0 .5em;color:var(--muted);font-size:.98rem}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;gap:6px;align-items:center;padding:2px 10px;border-radius:999px;border:1.5px solid var(--line);font-size:.85rem;font-weight:600;color:var(--muted);background:var(--surface)}
.chip.on{border-color:var(--mc);color:var(--ink)}
.chip.on::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--mc)}

/* module page */
.mhead{display:flex;gap:18px;align-items:center;margin-bottom:8px}
.mhead .num{width:56px;height:56px;border-radius:50%;background:var(--mc);color:#fff;display:grid;place-items:center;font-weight:800;font-size:1.5rem;flex:none}
.mhead h1{margin:0;font-size:clamp(1.7rem,4.5vw,2.6rem)}
.crumb{font-size:.9rem;color:var(--muted);margin-bottom:12px}
.tabs{display:flex;flex-wrap:wrap;gap:4px;margin:20px 0 24px;border-bottom:2px solid var(--line)}
.tabs a{padding:10px 16px;text-decoration:none;color:var(--muted);font-weight:700;border-bottom:4px solid transparent;margin-bottom:-2px}
.tabs a:hover{color:var(--ink)}
.tabs a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--mc)}

.course section{margin-bottom:8px}
.course h2{border-left:5px solid var(--mc);padding-left:12px}
.course ul,.course ol{padding-left:1.3em;max-width:68ch}
.course li{margin:.3em 0}
.course table{border-collapse:collapse;width:100%;margin:12px 0;font-size:.96rem;background:var(--surface);border-radius:var(--radius);overflow:hidden}
.course th,.course td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.course th{background:#DDE5E0;font-weight:700}
.tablewrap{overflow-x:auto}
.tip{background:var(--surface);border-left:5px solid #E0A526;padding:12px 16px;border-radius:0 var(--radius) var(--radius) 0;margin:16px 0;max-width:68ch}
.tip b{display:block;margin-bottom:2px}
.warn{border-left-color:var(--bad)}
.done-row{margin-top:32px;display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* carte mentale : fiches */
.fiches{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px;align-items:start}
.fiche{background:var(--surface);border:1px solid var(--line);border-top:5px solid var(--c);border-radius:var(--radius);padding:16px 20px 18px}
.fiche h3{margin:0 0 10px;color:var(--c);font-size:1.15rem;line-height:1.25}
.fiche-list{margin:0;padding:0;list-style:none}
.fiche-list li{position:relative;padding-left:18px;margin:6px 0;line-height:1.45}
.fiche-list li::before{content:"";position:absolute;left:2px;top:.6em;width:7px;height:7px;border-radius:50%;background:var(--c)}
.fiche-list .fiche-list{margin-top:4px}
.fiche-list .fiche-list li{font-size:.95rem;color:var(--muted)}
.fiche-list .fiche-list li::before{background:none;border:1.5px solid var(--c);width:5px;height:5px}
.fiche-sub{font-weight:700}
.fiche-list strong{font-weight:700;color:var(--ink)}
.fiche-more{display:inline-block;margin-top:12px;font-weight:700;color:var(--c);font-size:.95rem}

/* quiz */
.qbox{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(16px,3vw,28px)}
.qmeta{display:flex;justify-content:space-between;color:var(--muted);font-weight:600;font-size:.92rem;margin-bottom:10px}
.qprog{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin-bottom:18px}
.qprog i{display:block;height:100%;background:var(--mc,var(--accent));transition:width .25s}
.qq{font-size:1.3rem;font-weight:700;line-height:1.3;margin:0 0 18px;max-width:none}
.opts{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.opt{width:100%;text-align:left;padding:13px 16px;border-radius:var(--radius);border:2px solid var(--line);background:#fff;font-weight:600;display:flex;gap:12px;align-items:flex-start}
.opt:hover:not(:disabled){border-color:var(--ink)}
.opt .k{flex:none;width:26px;height:26px;border-radius:50%;border:2px solid currentColor;display:grid;place-items:center;font-size:.8rem;font-weight:800;opacity:.7}
.opt:disabled{cursor:default}
.opt.right{border-color:var(--good);background:#E3F2E8}
.opt.wrong{border-color:var(--bad);background:#F9E4E1}
.why{margin-top:16px;padding:12px 16px;border-radius:var(--radius);background:#EEF1F6;max-width:none}
.why.bad{background:#FBEDEA}
.qfoot{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.score{font-size:clamp(2.4rem,8vw,4rem);font-weight:800;letter-spacing:-.03em;line-height:1}
.review{margin:20px 0 0;padding:0;list-style:none;display:grid;gap:10px}
.review li{padding:12px 16px;background:#fff;border:1px solid var(--line);border-left:5px solid var(--bad);border-radius:var(--radius)}
.review small{display:block;color:var(--muted)}

/* flashcards */
.fc-wrap{display:grid;gap:18px;justify-items:center}
.fc-stat{color:var(--muted);font-weight:600;font-size:.92rem}
.card{perspective:1200px;width:min(560px,100%);height:min(300px,60vw);min-height:220px;border:0;background:none;padding:0}
.card-in{position:relative;width:100%;height:100%;transition:transform .45s cubic-bezier(.3,.7,.2,1);transform-style:preserve-3d}
.card.flip .card-in{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;border-radius:14px;padding:24px;display:grid;place-items:center;text-align:center;font-size:clamp(1.2rem,3.6vw,1.6rem);font-weight:700;line-height:1.3;border:2px solid var(--ink);background:var(--surface)}
.face small{display:block;font-size:.8rem;font-weight:600;color:var(--muted);margin-bottom:8px}
.back{transform:rotateY(180deg);background:var(--mc,var(--ink));color:#fff;border-color:var(--mc,var(--ink))}
.back small{color:rgba(255,255,255,.8)}
.fc-btns{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.btn.again{background:#fff;color:var(--bad);border-color:var(--bad)}
.btn.again:hover{background:var(--bad);color:#fff}
.btn.know{background:var(--good);border-color:var(--good)}
.btn.know:hover{filter:brightness(1.1)}
@media (prefers-reduced-motion:reduce){
  .enso circle{animation:none}
  .card-in,.qprog i{transition:none}
  html{scroll-behavior:auto}
}

/* revisions */
.plan{list-style:none;margin:16px 0;padding:0;display:grid;gap:10px}
.plan li{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.plan b{font-weight:800}
.empty{padding:28px;background:var(--surface);border:2px dashed var(--line);border-radius:var(--radius);text-align:center}

/* schémas du cours */
.vis{margin:18px 0;overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px}
.vis svg{display:block;width:100%;min-width:560px;height:auto;max-width:820px;margin:0 auto}

/* pratique */
.prac{list-style:none;margin:0;padding:0;display:grid;gap:18px}
.pcard{background:var(--surface);border:1px solid var(--line);border-left:6px solid var(--mc);border-radius:var(--radius);padding:16px 20px}
.pcard.fait{background:#EAF3EC;border-left-color:var(--good)}
.phead{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px}
.phead h3{margin:0;flex:1 1 220px;font-size:1.2rem}
.pgoal{color:var(--muted);margin:.4em 0}
.psteps{padding-left:1.3em;margin:.5em 0;max-width:68ch}
.psteps li{margin:.3em 0}
.plist{margin:.4em 0;padding-left:1.2em;max-width:68ch;color:var(--ink)}
.ptip{background:#FFF7E0;padding:8px 12px;border-radius:8px;max-width:68ch}
.pcard details{margin:.6em 0}
.pcard summary{cursor:pointer;font-weight:700;color:var(--accent)}
.pcheck{display:flex;gap:10px;align-items:center;margin-top:10px;font-weight:700;cursor:pointer}
.pcheck input{width:22px;height:22px;accent-color:var(--good)}

/* corps */
.bodygrid{display:grid;grid-template-columns:minmax(300px,480px) 1fr;gap:20px 32px;align-items:start}
@media (max-width:820px){.bodygrid{grid-template-columns:1fr}}
.bodybox{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:8px}
.body-svg{display:block;width:100%;height:auto;max-height:78vh}
.bp{cursor:pointer}
.bp .dot{transition:r .15s}
.bp:hover .dot,.bp:focus-visible .dot{r:11}
.bp.sel .dot{r:12;stroke:#E0A526;stroke-width:4}
.bp.good .dot{r:12;stroke:#2F7D4F;stroke-width:4}
.bp.bad .dot{r:12;stroke:#B63A2E;stroke-width:4}
.bp:focus{outline:none}
.bp:focus-visible .hit{stroke:#E0A526;stroke-width:3}
.pinfo{background:var(--surface);border:1px solid var(--line);border-left:6px solid var(--mc);border-radius:var(--radius);padding:8px 20px 16px}
.pinfo h2{margin-top:.6em}
.pinfo h3{margin-bottom:.1em}
.qq small{font-weight:500;color:var(--muted)}

/* méthode */
.method{list-style:none;margin:24px 0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;counter-reset:s}
.method li{background:var(--surface);border:1px solid var(--line);border-top:6px solid var(--mc);border-radius:var(--radius);padding:4px 18px 16px}
.method h2{margin:.7em 0 .2em;color:var(--mc)}
.method p{margin:.3em 0}