:root{--gold:#b8874a;--gold-deep:#8f6630;--ink:#1a140f;--ink-soft:#54483d;--paper:#fffdf9;--wash:#f8f0e2;--line:#e6dccd;--rust:#9a4a2a}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:'Lora',Georgia,'Times New Roman',serif;font-size:1.125rem;line-height:1.75}
a{color:var(--gold-deep)}
.brand{font-family:'Fraunces',Georgia,serif;font-style:italic;font-weight:600;font-size:1.25rem;color:var(--ink);text-decoration:none;border-bottom:2px solid var(--gold)}
.topbar .brand{display:inline-flex;align-items:center;border-bottom:none}
.topbar .brand img{height:26px;width:auto;display:block}
main{max-width:46rem;margin:0 auto;padding:1.5rem 1.25rem 3rem}
h1,h2,h3,h4{font-family:'Fraunces',Georgia,serif;font-style:italic;font-weight:600;line-height:1.2;color:var(--ink)}
h1{font-size:clamp(2rem,6vw,2.8rem);margin:.8rem 0 1rem;letter-spacing:-.01em}
h2{font-size:1.6rem;margin:2.6rem 0 .6rem}
h3{font-size:1.3rem;margin:2.2rem 0 .8rem}
h4{font-size:1.1rem;margin:1.6rem 0 .4rem}
.crumb{font-family:'Sora',system-ui,sans-serif;font-size:.8rem;color:var(--ink-soft);margin:.2rem 0 0}
.crumb a{color:var(--ink-soft)}
.lead{font-size:1.2rem;color:var(--ink-soft);margin:0 0 1rem}
p{margin:.65rem 0}
ul,ol{margin:.6rem 0;padding-left:1.4rem}
li{margin:.25rem 0}
hr{border:0;border-top:1px solid var(--line);margin:2.6rem 0}
blockquote{margin:1rem 0;padding:.2rem 0 .2rem 1.2rem;border-left:3px solid var(--gold)}
blockquote p{margin:.55rem 0}
blockquote ul,blockquote ol{margin:.4rem 0}
.box{margin:1.4rem 0;padding:.8rem 1.1rem;border-radius:8px;background:var(--wash);border-left:4px solid var(--gold)}
.box.warn{background:#fbf3ee;border-left-color:var(--rust)}
.box p:first-child,.box ul:first-child,.box ol:first-child{margin-top:.2rem}
.box p:last-child,.box ul:last-child,.box ol:last-child{margin-bottom:.2rem}
details{margin:1.1rem 0;border:1px solid var(--gold);border-radius:8px;background:var(--paper)}
summary{cursor:pointer;font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.95rem;color:var(--gold-deep);padding:.75rem 1rem}
summary:focus-visible,.btn:focus-visible,.brand:focus-visible,a:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
details[open]{background:var(--wash)}
details[open]>summary{border-bottom:1px solid var(--line)}
.corr{padding:.3rem 1.1rem 1.1rem}
.q{font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.95rem;margin:1.4rem 0 .3rem}
.res{margin:.7rem 0;padding:.55rem .9rem;background:var(--paper);border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:4px}
pre{margin:1rem 0;padding:.9rem 1.1rem;background:var(--wash);border:1px solid var(--line);border-radius:8px;overflow-x:auto;line-height:1.55}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}
:not(pre)>code{background:var(--wash);padding:.1em .35em;border-radius:4px}
.katex{font-size:1.07em}
.mathline{overflow-x:auto;overflow-y:hidden;padding:.1rem 0}
.mathline .katex-display{margin:.7em 0}
.lessons{list-style:none;padding:0;margin:1rem 0}
.lessons li{margin:0;border-top:1px solid var(--line)}
.lessons li:last-child{border-bottom:1px solid var(--line)}
.lessons a,.lessons .soon{display:block;padding:.7rem .3rem;text-decoration:none;color:var(--ink)}
.lessons a:hover{background:var(--wash)}
.lessons .soon,.side .soon{color:var(--ink-soft);opacity:.6}
.btn{display:inline-block;font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.95rem;color:var(--paper);background:var(--ink);padding:.75rem 1.2rem;border-radius:6px;text-decoration:none}
.btn:hover{background:var(--gold-deep)}
.foot{max-width:46rem;margin:0 auto;padding:0 1.25rem 2.5rem;font-family:'Sora',system-ui,sans-serif;font-size:.8rem;color:var(--ink-soft)}
.layout{display:grid;grid-template-columns:21rem minmax(0,1fr);align-items:start}
.side{position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--wash);border-right:1px solid var(--line);padding:1.4rem 1rem 2rem 1.25rem;font-size:.95rem;line-height:1.45}
.side-head{margin-bottom:1.2rem}
.course{font-family:'Sora',system-ui,sans-serif;font-size:.78rem;color:var(--ink-soft);margin:.5rem 0 0;line-height:1.4}
.course a{color:var(--ink-soft)}
.side ul{list-style:none;margin:0;padding:0}
.side li{margin:0}
.side ul.flat{margin-bottom:.6rem}
.side a,.side .soon{display:block;color:var(--ink);text-decoration:none;padding:.32rem .6rem;border-left:3px solid transparent;border-radius:0 4px 4px 0}
.side a:hover{background:rgba(184,135,74,.12)}
.side a.cur{border-left-color:var(--gold);background:var(--paper);font-weight:600}
.side a:focus-visible{outline:3px solid var(--gold);outline-offset:-2px}
.chap{border-top:1px solid var(--line);border-radius:0;background:transparent}
.chap summary{font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.86rem;color:var(--ink);padding:.75rem .3rem;margin-left:1rem}
.chap[open]{background:transparent}
.chap[open]>summary{border-bottom:0}
.chap ul{padding-bottom:.6rem}
.page{min-width:0}
.topbar,.backdrop{display:none}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin:3rem 0 0}
.pager a{display:block;font-size:.95rem;line-height:1.4;color:var(--ink);text-decoration:none;padding:.8rem 1rem;border:1px solid var(--line);border-radius:8px}
.pager a:hover{border-color:var(--gold)}
.pager a span{display:block;font-family:'Sora',system-ui,sans-serif;font-size:.75rem;font-weight:600;color:var(--gold-deep);margin-bottom:.2rem}
.pager .p-next{text-align:right}
.cta{margin-top:2.6rem;padding-top:1.6rem;border-top:1px solid var(--line)}
@media (max-width:900px){
  .layout{display:block}
  .topbar{display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20;background:var(--paper);border-bottom:1px solid var(--line);padding:.7rem 1.25rem}
  #menu-btn{font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.9rem;color:var(--paper);background:var(--ink);border:0;border-radius:6px;padding:.55rem .9rem;cursor:pointer}
  #menu-btn:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
  .side{position:fixed;z-index:40;top:0;left:0;bottom:0;height:auto;width:min(22rem,88vw);transform:translateX(-100%);transition:transform .2s ease}
  body.menu-open .side{transform:none}
  .backdrop{position:fixed;inset:0;z-index:30;background:rgba(26,20,15,.45)}
  body.menu-open .backdrop{display:block}
  body.menu-open{overflow:hidden}
  .side-head .brand{display:none}
  .pager{grid-template-columns:1fr}
  .pager .p-next{text-align:left}
  body{font-size:1.05rem}
}
@media (prefers-reduced-motion:reduce){.side{transition:none}}
@media print{.side,.topbar,.pager,.backdrop,.cta{display:none}.layout{display:block}summary{display:none}details{border:0}}
/* tableaux */
main table{border-collapse:collapse;width:100%;margin:1rem 0;font-size:1rem;display:block;overflow-x:auto}
main th,main td{border:1px solid var(--line);padding:.5rem .8rem;text-align:left;vertical-align:top}
main th{background:var(--wash);font-family:'Sora',system-ui,sans-serif;font-size:.9rem}
/* lien Ressources dans l'en-tête du cours */
.tb-link{font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.8rem;color:var(--ink-soft);text-decoration:none;margin-left:auto;margin-right:.8rem}
.tb-link:hover{color:var(--gold-deep)}
.btn.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--gold)}
.btn.ghost:hover{background:var(--wash);color:var(--ink)}
/* page Ressources */
.rtop{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;max-width:64rem;margin:0 auto;padding:1rem 1.25rem}
.rtop nav{display:flex;flex-wrap:wrap;font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.85rem}
.rtop nav a+a{margin-left:1.2rem}
.rtop nav a{color:var(--ink-soft);text-decoration:none;padding:.2rem 0;border-bottom:2px solid transparent}
.rtop nav a:hover,.rtop nav a[aria-current]{color:var(--ink);border-bottom-color:var(--gold)}
.rmain{max-width:64rem;margin:0 auto;padding:1rem 1.25rem 3rem}
.rfeat{margin:2rem 0;padding:1.4rem 1.6rem;border-radius:10px;background:var(--wash);border-left:5px solid var(--gold)}
.rfeat h2{margin:.2rem 0 .6rem}
.rkick{font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-deep);margin:0}
.rgrid{list-style:none;margin:1rem 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(17rem,1fr));gap:.8rem}
.rgrid li{margin:0}
.rcard{display:flex;align-items:center;padding:.8rem 1rem;border:1px solid var(--line);border-radius:8px;background:var(--paper);text-decoration:none;color:var(--ink);height:100%}
.rcard:hover{border-color:var(--gold);background:var(--wash)}
.rnum{margin-right:.9rem;flex:0 0 2.2rem;height:2.2rem;border-radius:50%;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.9rem}
.rtxt{display:flex;flex-direction:column;line-height:1.3}
.rtxt small{font-family:'Sora',system-ui,sans-serif;font-size:.75rem;color:var(--ink-soft)}
.rhelp{margin-top:2.6rem;padding-top:1.6rem;border-top:1px solid var(--line)}
.rfoot{max-width:64rem;margin:0 auto;padding:0 1.25rem 2.5rem;font-family:'Sora',system-ui,sans-serif;font-size:.8rem;color:var(--ink-soft)}
.rfoot a{color:var(--ink-soft)}
.rsub{font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.9rem;margin:.5rem 0 0}
.rmain h3{margin:1.4rem 0 .4rem}
/* progression (espace membre) */
.pq-bar{display:flex;flex-wrap:wrap;margin:.6rem 0 1.2rem}
.pq-bar button{margin:0 .5rem .5rem 0;padding:.55rem .95rem;border:1.5px solid var(--gold);border-radius:6px;background:var(--paper);color:var(--ink);font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.82rem;cursor:pointer;min-height:40px}
.pq-bar button:hover{background:var(--wash)}
.pq-bar button[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.pq-bottom{margin:1.8rem 0 0}
.side li.pq-ok > a::after{content:" ✓";color:#3f6b3a;font-weight:600}
@media print{.pq-bar{display:none}}
/* QCM de fin de fiche */
.qcm{margin:2.6rem 0 1rem;padding:1.2rem 1.3rem;border:1px solid var(--gold);border-radius:10px;background:var(--wash)}
.qcm .qh{margin:0 0 .3rem;font-size:1.5rem}
.qcm .qi{margin:.2rem 0 1rem;color:var(--ink-soft);font-size:.95rem}
.qq{margin:1rem 0;padding:1rem;border:1px solid var(--line);border-radius:8px;background:var(--paper)}
.qq .qs{margin:0;font-family:'Sora',system-ui,sans-serif;font-weight:600;font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--gold-deep)}
.qq .qt{margin:.3rem 0 .7rem;font-weight:600}
.qo{list-style:none;margin:0;padding:0}
.qo li{margin:.4rem 0}
.qb{display:block;width:100%;text-align:left;padding:.65rem .9rem;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);font:inherit;font-size:1rem;line-height:1.5;cursor:pointer;min-height:44px}
.qb:hover:not(:disabled){border-color:var(--gold);background:var(--wash)}
.qb:disabled{cursor:default;color:var(--ink)}
.qb.qok{border-color:#3f6b3a;background:#eef5ec}
.qb.qko{border-color:var(--rust);background:#fbeee8}
.qb.qok::before{content:"✓ ";color:#3f6b3a;font-weight:700}
.qb.qko::before{content:"✗ ";color:var(--rust);font-weight:700}
.qe{margin:.7rem 0 0;padding:.6rem .8rem;border-left:4px solid var(--gold);background:var(--wash);border-radius:0 6px 6px 0;font-size:.97rem}
.qe p{margin:0}
.qsum{margin:1.2rem 0 0;padding:1rem 1.1rem;border-radius:8px;background:var(--ink);color:var(--paper)}
.qsum p{margin:.3rem 0}
.qsum .qscore{font-family:'Fraunces',Georgia,serif;font-style:italic;font-size:1.5rem}
.qsum button{margin:.5rem .5rem 0 0;padding:.6rem 1rem;border:1.5px solid var(--gold);border-radius:6px;background:transparent;color:var(--paper);font:600 .85rem 'Sora',system-ui,sans-serif;cursor:pointer;min-height:44px}
.qsum button:hover{background:rgba(255,255,255,.1)}
.qsum button[aria-pressed="true"]{background:var(--gold);color:var(--ink);border-color:var(--gold)}
@media print{.qcm .qb{border-color:#999}.qcm .qe{display:block!important}}