:root{
  --paper:#F4F6F8; --surface:#FFFFFF; --ink:#24160E; --muted:#5E5049; --line:#D5DAE0;
  --cocoa:#6B3A22; --on-cocoa:#FFFFFF; --cocoa-soft:#F4E8E0;
  --wave:#17607F; --wave-soft:#E2EFF5;
  --danger:#A8261B; --danger-soft:#FCEBE8;
  --ok:#1C7343; --ok-soft:#E3F3E9;
  --call:#7A4E00; --call-soft:#FFF3D6;
  color-scheme:light;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#14110F; --surface:#1F1916; --ink:#F2EAE4; --muted:#B9ABA1; --line:#3B322C;
    --cocoa:#E3A982; --on-cocoa:#1A1310; --cocoa-soft:#2E211A;
    --wave:#79C2E0; --wave-soft:#132E3A;
    --danger:#FF8C7C; --danger-soft:#3A1D19;
    --ok:#7FD6A3; --ok-soft:#14301F;
    --call:#F3C66E; --call-soft:#33290F;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#14110F; --surface:#1F1916; --ink:#F2EAE4; --muted:#B9ABA1; --line:#3B322C;
  --cocoa:#E3A982; --on-cocoa:#1A1310; --cocoa-soft:#2E211A;
  --wave:#79C2E0; --wave-soft:#132E3A;
  --danger:#FF8C7C; --danger-soft:#3A1D19;
  --ok:#7FD6A3; --ok-soft:#14301F;
  --call:#F3C66E; --call-soft:#33290F;
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px);-webkit-text-size-adjust:100%}
html[data-mode="simple"]{font-size:112.5%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Atkinson Hyperlegible",Verdana,"Segoe UI",system-ui,sans-serif;line-height:1.6;}
html[data-mode="simple"] body{line-height:1.75;word-spacing:.06em;letter-spacing:.01em}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--paper)}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
html[data-mode="simple"] .expert-only, html[data-mode="expert"] .simple-only{display:none!important}
h1,h2,h3,h4{font-family:"Bricolage Grotesque","Atkinson Hyperlegible",system-ui,sans-serif;line-height:1.2;margin:0 0 .5em}
h2{font-size:1.85rem;margin-top:.2em}
h3{font-size:1.25rem;margin-top:1.8em}
h4{font-size:1.05rem;margin-top:1.2em}
p{margin:0 0 .9em}
a{color:var(--wave)}
img,svg,canvas{max-width:100%}
:focus-visible{outline:3px solid var(--wave);outline-offset:2px;border-radius:4px}
.wrap{max-width:900px;margin:0 auto;padding:0 1rem}
sub,sup{line-height:0}

/* En-tête */
header.app{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--paper);border-bottom:1px solid var(--line)}
.topbar{display:flex;flex-wrap:wrap;gap:.6rem 1.2rem;align-items:center;justify-content:space-between;padding:.7rem 0 .5rem}
.title small{display:block;color:var(--muted);font-size:.85rem}
.title strong{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-size:1.15rem}
.mode{display:inline-flex;border:2px solid var(--cocoa);border-radius:999px;padding:2px;background:var(--surface)}
.mode button{font:inherit;font-size:.92rem;font-weight:700;border:0;background:transparent;color:var(--cocoa);padding:.35rem .9rem;border-radius:999px;cursor:pointer;min-height:36px}
.mode button[aria-pressed="true"]{background:var(--cocoa);color:var(--on-cocoa)}
.mode-hint{font-size:.8rem;color:var(--muted)}
nav.tabs{display:flex;gap:.2rem;overflow-x:auto;scrollbar-width:thin;padding-bottom:1px}
nav.tabs button{font:inherit;font-size:.93rem;white-space:nowrap;border:0;background:none;color:var(--muted);padding:.55rem .7rem .6rem;border-bottom:3px solid transparent;cursor:pointer;display:flex;align-items:center;gap:.4rem}
nav.tabs button .n{display:inline-grid;place-items:center;width:1.45em;height:1.45em;border-radius:50%;border:1.5px solid currentColor;font-size:.78em;font-weight:700}
nav.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--cocoa);font-weight:700}
nav.tabs button[aria-selected="true"] .n{background:var(--cocoa);border-color:var(--cocoa);color:var(--on-cocoa)}
nav.tabs button.prof{margin-left:auto}

main{padding:1.6rem 0 2rem}
section.panel{animation:none}
.lead{font-size:1.15rem;max-width:62ch}
.muted{color:var(--muted)}

/* Blocs */
.box{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:1rem 1.15rem;margin:1rem 0}
.problem{border:2px solid var(--cocoa);background:var(--cocoa-soft);border-radius:14px;padding:1.1rem 1.25rem;margin:1.4rem 0}
.problem p{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-size:1.3rem;font-weight:700;margin:0}
.callout{border-left:5px solid;border-radius:0 8px 8px 0;padding:.8rem 1rem;margin:1rem 0}
.callout > :last-child{margin-bottom:0}
.callout strong.t{display:block;margin-bottom:.25rem}
.callout.danger{border-color:var(--danger);background:var(--danger-soft)}
.callout.danger strong.t{color:var(--danger)}
.callout.tip{border-color:var(--wave);background:var(--wave-soft)}
.callout.call{border-color:var(--call);background:var(--call-soft)}
.callout.call strong.t{color:var(--call)}
.callout ul{margin:.3rem 0 0;padding-left:1.2rem}
.doc{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:.9rem 1.1rem;margin:.8rem 0}
.doc h4{margin-top:0;color:var(--wave)}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:.8rem}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;padding:0;list-style:none;margin:.5rem 0}
.chips li{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:.45rem .7rem;font-size:.92rem}
.chips b{color:var(--cocoa)}

/* Formulaires */
label.f{display:block;font-weight:700;font-size:.92rem;margin:.6rem 0 .25rem}
input[type=text],input[type=number],textarea,select{font:inherit;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:8px;padding:.5rem .65rem;width:100%;min-height:44px}
textarea{min-height:110px;resize:vertical}
input:focus,textarea:focus{border-color:var(--wave)}
.row{display:flex;flex-wrap:wrap;gap:.8rem}
.row > div{flex:1 1 180px}
.btn{font:inherit;font-weight:700;border:2px solid var(--cocoa);background:var(--cocoa);color:var(--on-cocoa);border-radius:8px;padding:.5rem 1rem;cursor:pointer;min-height:44px}
.btn.ghost{background:transparent;color:var(--cocoa)}
.btn.small{padding:.3rem .7rem;min-height:36px;font-size:.9rem}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btns{display:flex;flex-wrap:wrap;gap:.6rem;margin:.8rem 0}
.fb{display:block;margin-top:.4rem;font-weight:700}
.fb.ok{color:var(--ok)} .fb.ko{color:var(--danger)}
.fb .hint{display:block;font-weight:400;color:var(--ink)}

/* Liste matériel */
ul.check{list-style:none;padding:0;margin:.5rem 0}
ul.check li{border-bottom:1px solid var(--line)}
ul.check label{display:flex;gap:.8rem;align-items:flex-start;padding:.65rem .2rem;cursor:pointer}
ul.check input{width:22px;height:22px;margin-top:.2rem;accent-color:var(--cocoa);flex:none}
ul.check .d{display:block;color:var(--muted);font-size:.9rem}
ul.check input:checked + span > b{text-decoration:line-through;text-decoration-color:var(--cocoa)}
.progress{font-size:.9rem;color:var(--muted)}

/* Étapes du protocole */
ol.steps{list-style:none;padding:0;margin:1rem 0;counter-reset:s}
ol.steps > li{position:relative;padding:0 0 1.3rem 3.2rem;counter-increment:s}
ol.steps > li::before{content:counter(s);position:absolute;left:0;top:0;width:2.2rem;height:2.2rem;border-radius:50%;background:var(--cocoa);color:var(--on-cocoa);display:grid;place-items:center;font-weight:700;font-family:"Bricolage Grotesque",sans-serif}
ol.steps > li::after{content:"";position:absolute;left:1.05rem;top:2.4rem;bottom:.2rem;width:2px;background:var(--line)}
ol.steps > li:last-child::after{display:none}
ol.steps > li.callrow{padding-left:3.2rem}
ol.steps > li.callrow::before{content:"!";background:var(--call);color:var(--surface)}
.step-head{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}
.step-head h4{margin:0;font-size:1.1rem}
.step-head label{margin-left:auto;font-size:.85rem;color:var(--muted);display:flex;gap:.35rem;align-items:center;cursor:pointer}
.step-head input{width:20px;height:20px;accent-color:var(--ok)}
.step-body p{margin:.35rem 0 0}
.why{font-size:.92rem;color:var(--muted);font-style:italic}
li.done .step-head h4{color:var(--ok)}
.tts{font:inherit;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:0 .55rem;min-height:32px;cursor:pointer;font-size:.9rem}

/* Simulation */
.sim{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:1rem;margin:1rem 0}
.sim canvas{display:block;width:100%;touch-action:pan-y;cursor:crosshair}
.oven-label{display:inline-block;font-size:.82rem;border:1px dashed var(--muted);border-radius:6px;padding:.2rem .5rem;color:var(--muted)}
.sim-status{min-height:1.6em;font-weight:700}
.sim-status.warn{color:var(--danger)}
.ranges{display:grid;grid-template-columns:auto 1fr auto;gap:.3rem .7rem;align-items:center;margin-top:.6rem}
.ranges input[type=range]{width:100%;accent-color:var(--wave);min-height:36px}
.ranges output{font-variant-numeric:tabular-nums;font-weight:700;min-width:5.5ch;text-align:right}
.readout{font-size:1.05rem;margin:.5rem 0}

/* Tableau de mesures */
.tablewrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
th,td{border:1px solid var(--line);padding:.45rem .55rem;text-align:left;vertical-align:middle}
thead th{background:var(--cocoa-soft)}
table.mes input{min-height:38px;padding:.3rem .5rem;max-width:9rem}
.stat{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;margin:.6rem 0;font-weight:700}
.calc{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:.9rem 1.1rem;margin:.8rem 0}
.calc h4{margin-top:0}
.calc .row > div{flex:1 1 220px}
.result{font-family:"Bricolage Grotesque",sans-serif;font-size:1.35rem;font-weight:700;color:var(--cocoa)}
.auto table td:first-child{width:46%}

/* QCM */
.qcm-item{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:.8rem 1rem;margin:.8rem 0}
.qcm-item legend{font-weight:700;padding:0 .3rem}
.qcm-item label.opt{display:flex;gap:.6rem;align-items:flex-start;padding:.35rem 0;cursor:pointer}
.qcm-item input{width:20px;height:20px;margin-top:.25rem;accent-color:var(--cocoa);flex:none}
.qcm-item.is-ok{border-color:var(--ok);background:var(--ok-soft)}
.qcm-item.is-ko{border-color:var(--danger);background:var(--danger-soft)}
.score{font-weight:700}
.oq{margin:1.2rem 0}
.oq .ans{border-left:4px solid var(--ok);background:var(--ok-soft);padding:.7rem 1rem;border-radius:0 8px 8px 0;margin-top:.6rem}

/* Cours */
.formula{display:flex;flex-wrap:wrap;align-items:center;gap:1rem 2rem;border:2px solid var(--wave);border-radius:14px;padding:1.2rem 1.4rem;margin:1rem 0;background:var(--wave-soft)}
.formula .big{font-family:"Bricolage Grotesque",sans-serif;font-size:2.6rem;font-weight:700;color:var(--wave);line-height:1}
.formula ul{margin:0;padding-left:1.1rem}

/* Cornell */
.cornell{background:#fff;color:#1b1b1b;border:1.5px solid #333;margin:1rem 0;font-size:.98rem}
.cornell .ch{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.3rem 1rem;padding:.6rem .8rem;border-bottom:1.5px solid #333}
.cornell .ch div{white-space:nowrap}
.cornell .ch .line{display:inline-block;min-width:8rem;border-bottom:1px solid #777}
.cornell h3{margin:0;padding:.6rem .8rem;border-bottom:1.5px solid #333;font-size:1.15rem;color:#1b1b1b}
.cornell .cr{display:grid;grid-template-columns:30% 1fr;border-bottom:1px solid #999}
.cornell .cr > div{padding:.55rem .8rem}
.cornell .cr .k{border-right:1.5px solid #333;font-weight:700;color:#5a2e17}
.cornell .cols{display:grid;grid-template-columns:30% 1fr;border-bottom:1.5px solid #333;font-size:.82rem;color:#555}
.cornell .cols > div{padding:.3rem .8rem}
.cornell .cols > div:first-child{border-right:1.5px solid #333}
.cornell .syn{padding:.7rem .8rem}
.cornell .syn b.lbl{display:block;margin-bottom:.3rem}
.cornell .lines span{display:block;height:2em;border-bottom:1px solid #999}
.cornell .blank{font-weight:700;color:#1d4f68}
.cornell.trous .blank{color:transparent;border-bottom:1.5px dotted #333;user-select:none;-webkit-user-select:none;padding:0 .4em;display:inline-block;min-width:4.5em}
.cornell .lines{display:none}
.cornell.trous .lines{display:block}
.cornell.trous .synth-full{display:none}

/* Prof */
details{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:.2rem 1rem;margin:.8rem 0}
details > summary{cursor:pointer;font-weight:700;padding:.6rem 0;min-height:44px}
details[open] > summary{border-bottom:1px solid var(--line);margin-bottom:.6rem}

/* Pager */
.pager{display:flex;justify-content:space-between;gap:1rem;margin-top:2.5rem;padding-top:1rem;border-top:1px solid var(--line)}
footer.site{font-size:.85rem;color:var(--muted);padding:1rem 0 2rem;border-top:1px solid var(--line)}

@media (max-width:600px){
  h2{font-size:1.5rem}
  .formula .big{font-size:2rem}
  .cornell .cr,.cornell .cols{grid-template-columns:1fr}
  .cornell .cr .k{border-right:0;border-bottom:1px dashed #bbb}
  .cornell .cols > div:first-child{border-right:0}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

@media print{
  @page{size:A4;margin:12mm}
  :root,:root:not([data-theme="light"]),:root[data-theme="dark"]{--paper:#fff;--surface:#fff;--ink:#000;--muted:#444;--line:#999;color-scheme:light}
  html,html[data-mode="simple"]{font-size:10.5pt}
  body{background:#fff;color:#000}
  body::before,header.app,.pager,.no-print,.tts,footer.site{display:none!important}
  main{padding:0}
  body.printing main section:not([hidden]) > *:not(.print-target){display:none!important}
  .cornell{border-color:#000;break-inside:auto}
  .cornell .cr{break-inside:avoid}
  .box,.calc{break-inside:avoid}
}

/* ===== Palettes par matière (seules --cocoa et --wave changent ; le style reste identique) ===== */
:root[data-palette="chimie"]{--cocoa:#1E6B4E;--cocoa-soft:#E2F2EA;--wave:#5B3E96;--wave-soft:#EEE8F7}
@media (prefers-color-scheme:dark){:root[data-palette="chimie"]:not([data-theme="light"]){--cocoa:#7FD1AE;--cocoa-soft:#15302A;--wave:#BBA4EE;--wave-soft:#251D38}}
:root[data-theme="dark"][data-palette="chimie"]{--cocoa:#7FD1AE;--cocoa-soft:#15302A;--wave:#BBA4EE;--wave-soft:#251D38}
:root[data-palette="electricite"]{--cocoa:#8A5A00;--cocoa-soft:#FBF0D9;--wave:#1F4E8C;--wave-soft:#E3ECF7}
@media (prefers-color-scheme:dark){:root[data-palette="electricite"]:not([data-theme="light"]){--cocoa:#F0C060;--cocoa-soft:#33280F;--wave:#8DB4EC;--wave-soft:#16253A}}
:root[data-theme="dark"][data-palette="electricite"]{--cocoa:#F0C060;--cocoa-soft:#33280F;--wave:#8DB4EC;--wave-soft:#16253A}
:root[data-palette="ondes"]{--cocoa:#1B4F8A;--cocoa-soft:#E3ECF7;--wave:#B4521E;--wave-soft:#FBEBE2}
@media (prefers-color-scheme:dark){:root[data-palette="ondes"]:not([data-theme="light"]){--cocoa:#8DB8EE;--cocoa-soft:#16253A;--wave:#F2A67A;--wave-soft:#35211A}}
:root[data-theme="dark"][data-palette="ondes"]{--cocoa:#8DB8EE;--cocoa-soft:#16253A;--wave:#F2A67A;--wave-soft:#35211A}
:root[data-palette="mecanique"]{--cocoa:#8E3B2E;--cocoa-soft:#F7E6E2;--wave:#2F6F6A;--wave-soft:#E1F1EF}
@media (prefers-color-scheme:dark){:root[data-palette="mecanique"]:not([data-theme="light"]){--cocoa:#EE9A8A;--cocoa-soft:#341C18;--wave:#7FCFC6;--wave-soft:#15302E}}
:root[data-theme="dark"][data-palette="mecanique"]{--cocoa:#EE9A8A;--cocoa-soft:#341C18;--wave:#7FCFC6;--wave-soft:#15302E}
:root[data-palette="maths"]{--cocoa:#4B3B8F;--cocoa-soft:#ECE8F7;--wave:#1F7A6D;--wave-soft:#E1F2EF}
@media (prefers-color-scheme:dark){:root[data-palette="maths"]:not([data-theme="light"]){--cocoa:#B3A5EE;--cocoa-soft:#231D3A;--wave:#7FD4C5;--wave-soft:#14302C}}
:root[data-theme="dark"][data-palette="maths"]{--cocoa:#B3A5EE;--cocoa-soft:#231D3A;--wave:#7FD4C5;--wave-soft:#14302C}
:root[data-palette="svt"]{--cocoa:#3F6B1F;--cocoa-soft:#E9F2E1;--wave:#8A4B12;--wave-soft:#F7EBDF}
@media (prefers-color-scheme:dark){:root[data-palette="svt"]:not([data-theme="light"]){--cocoa:#A9D884;--cocoa-soft:#1E2E14;--wave:#E7A86A;--wave-soft:#33231A}}
:root[data-theme="dark"][data-palette="svt"]{--cocoa:#A9D884;--cocoa-soft:#1E2E14;--wave:#E7A86A;--wave-soft:#33231A}

/* ===== Moteur générique ===== */
.enonce > :last-child{margin-bottom:0}
.enonce h4{margin-top:0}
.q{margin:.9rem 0}
.q .fb .hint{margin-top:.15rem}
.mark{font-weight:700;text-align:center;width:2.2rem}
.mark.ok{color:var(--ok)} .mark.ko{color:var(--danger)}
table.grille select,table.grille input{min-height:40px;font:inherit;padding:.3rem .45rem;border-radius:8px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);width:100%}
.cases{display:flex;flex-wrap:wrap;gap:.3rem 1.2rem;margin:.5rem 0}
.cases label{display:flex;gap:.45rem;align-items:center;min-height:40px;cursor:pointer}
.cases input{width:20px;height:20px;accent-color:var(--cocoa)}
.idbar{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;font-size:.88rem}
.badge{display:inline-block;border:1.5px solid var(--cocoa);color:var(--cocoa);border-radius:999px;padding:.1rem .65rem;font-weight:700}
.login{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;padding:.6rem 0}
.login input{max-width:14rem;text-transform:uppercase;letter-spacing:.08em}
.banner{border-radius:8px;padding:.55rem .9rem;margin:.8rem 0;font-weight:700}
.banner.train{background:var(--wave-soft);color:var(--ink)}
.banner.eval{background:var(--call-soft);color:var(--ink);border-left:5px solid var(--call)}
html.eval .verif,html.eval .reveal,html.eval .fb{display:none!important}
.result-card{border:2px solid var(--cocoa);border-radius:12px;padding:1rem 1.2rem;margin:1rem 0;background:var(--surface)}