:root{
  --bg:#F5F6FA;--card:#FFFFFF;--ink:#161A33;--muted:#5B6180;--line:#E3E6F0;--field:#C9CEE3;
  --c:#3B4FE0;--ct:#E8EBFD;--cx:#2A3BB8;
  --ok:#0B7A4B;--ok-t:#DDF5E6;--ok-x:#075B38;
  --bad:#B42318;--bad-t:#FDE7E4;--bad-x:#8A1C12;
  --warn-t:#FEF1D6;--warn-x:#92400E;
  --font:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:ui-monospace,'JetBrains Mono',Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.5}
#shell{max-width:480px;margin:0 auto;min-height:100vh;min-height:100dvh;position:relative;background:var(--bg)}
#app{padding:20px 20px 110px;display:flex;flex-direction:column;gap:14px}
.pad{padding:20px}
h1{margin:0;font-size:26px;line-height:1.15;font-weight:800;letter-spacing:-.4px}
h2{margin:6px 0 0;font-size:18px;font-weight:800}
h3{margin:0;font-size:19px;font-weight:800;letter-spacing:-.2px}
p{margin:0}
.muted{color:var(--muted)}
.small{font-size:13px}
a{color:var(--c)}
code{font-family:var(--mono);font-size:.9em;background:#EEF0F8;border-radius:6px;padding:1px 6px;word-break:break-word}
pre{margin:0;font-family:var(--mono);font-size:13.5px;line-height:1.6;white-space:pre-wrap;word-break:break-word}

/* navigation */
#nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;display:flex;background:#fff;border-top:1px solid var(--line);padding:8px 8px calc(10px + env(safe-area-inset-bottom));z-index:10}
#nav a{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 0;text-decoration:none;font-size:12px;font-weight:600;color:var(--muted);min-height:48px}
#nav a.on{color:#3B4FE0;font-weight:800}
#nav svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* composants */
.row{display:flex;align-items:center;gap:10px}
.between{justify-content:space-between}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 14px;border-radius:12px;font-size:14px;font-weight:700}
.chip svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.chip.fire{background:var(--warn-t);color:var(--warn-x)}
.chip.pts{background:#E8EBFD;color:#2A3BB8}
.tag{display:inline-block;font-size:13px;font-weight:700;border-radius:10px;padding:5px 10px;background:var(--ct);color:var(--cx)}
.tag.lvl{background:var(--warn-t);color:var(--warn-x)}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;display:flex;flex-direction:column;gap:10px}
.card.dark{background:#161A33;border-color:#161A33;color:#fff}
.card.dark .muted{color:#C9CEF5}
a.card{text-decoration:none;color:inherit}
.chap{flex-direction:row;align-items:center;gap:14px;padding:14px}
.badge{width:48px;height:48px;border-radius:14px;background:var(--ct);color:var(--cx);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex:none}
.chap-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:5px}
.chap-title{font-size:16px;font-weight:800}
.pct{font-size:13px;font-weight:800;color:var(--cx)}
.bar{height:8px;border-radius:4px;background:var(--ct);overflow:hidden}
.bar i{display:block;height:100%;border-radius:4px;background:var(--c)}
.btn{display:flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 18px;border:0;border-radius:14px;background:var(--c);color:#fff;font:700 16px var(--font);text-decoration:none;cursor:pointer;text-align:center}
.btn.ghost{background:#fff;color:var(--ink);border:1.5px solid var(--field)}
.btn.light{background:#fff;color:#161A33}
.btn.bad{background:var(--bad)}
.btn.ok{background:var(--ok)}
.btn[disabled]{opacity:.5;cursor:default}
.btns{display:flex;gap:10px}
.btns .btn{flex:1}
.back{width:44px;height:44px;border-radius:14px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;color:var(--ink);flex:none;text-decoration:none}
.back svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.tabs{display:flex;gap:8px;overflow-x:auto;margin:0 -20px;padding:0 20px 2px;scrollbar-width:none}
.tabs a{flex:none;height:40px;display:flex;align-items:center;padding:0 16px;border:1.5px solid var(--field);border-radius:20px;background:#fff;color:var(--ink);font-size:14px;font-weight:600;text-decoration:none}
.tabs a.on{background:var(--c);border-color:var(--c);color:#fff;font-weight:700}
.eyebrow{font-size:12px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;color:var(--cx)}
.card.dark .eyebrow{color:#C9CEF5}

/* cours */
.prose p{margin:0 0 8px}
.prose ul{margin:0 0 8px;padding-left:20px;display:flex;flex-direction:column;gap:4px}
.prose li{line-height:1.5}
.box{border-radius:14px;padding:14px 16px;font-size:15px;line-height:1.5}
.box.ex{background:var(--ct)}
.box.tip{background:var(--warn-t);color:#5C2D06}
.box.ok{background:var(--ok-t);color:var(--ok-x)}
.katex{font-size:1.1em}

/* quiz */
.opt{display:flex;align-items:center;gap:12px;min-height:56px;padding:8px 14px;border:2px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);text-align:left;font:600 16px var(--font);width:100%;cursor:pointer}
.opt .key{width:30px;height:30px;border-radius:50%;background:#F0F1F8;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;flex:none}
.opt .lab{flex:1}
.opt .note{font-size:13px;font-weight:700}
.opt svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.opt.good{border-color:var(--ok);background:var(--ok-t)}
.opt.good .key{background:var(--ok);color:#fff}
.opt.good .note{color:var(--ok-x)}
.opt.wrong{border-color:var(--bad);background:var(--bad-t)}
.opt.wrong .key{background:var(--bad);color:#fff}
.opt.wrong .note{color:var(--bad-x)}
.opt:disabled{cursor:default}
.opts{display:flex;flex-direction:column;gap:10px}
.q{font-size:22px;line-height:1.35;font-weight:800;letter-spacing:-.2px}
.top{display:flex;align-items:center;gap:12px}
.top .bar{flex:1;background:#E3E6F0}
.score{font-size:48px;font-weight:800;letter-spacing:-1px;color:var(--c)}
.timer{font:700 14px var(--mono);background:var(--warn-t);color:var(--warn-x);border-radius:10px;padding:5px 10px}

/* cartes */
.flash{min-height:220px;justify-content:center;align-items:center;text-align:center;font-size:22px;font-weight:800;line-height:1.35;padding:28px 20px}
.flash .side{font-size:12px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;color:var(--cx)}
.flash.verso{background:var(--ct);border-color:var(--ct);font-weight:600;font-size:19px}

/* exercices */
details{border-radius:14px;background:#F0F1F8;padding:0}
summary{cursor:pointer;min-height:44px;display:flex;align-items:center;padding:0 14px;font-weight:700;font-size:15px;color:var(--cx)}
details[open] summary{border-bottom:1px solid var(--line)}
details .in{padding:12px 14px;display:flex;flex-direction:column;gap:8px}
details ol{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:6px}
textarea.code{width:100%;min-height:170px;border-radius:14px;border:0;background:#12152B;color:#E8EAF4;font:13.5px/1.6 var(--mono);padding:14px;resize:vertical}
iframe.prev{width:100%;height:150px;border:1px solid var(--line);border-radius:14px;background:#fff}
.sol{background:#12152B;color:#E8EAF4;border-radius:12px;padding:12px 14px}

/* progression */
.rowbar{display:flex;flex-direction:column;gap:6px}
.rowbar .l{display:flex;justify-content:space-between;font-size:14px;font-weight:600;gap:10px}
.weak{background:var(--bad-t);border-radius:16px;padding:14px 16px;display:flex;flex-direction:column;gap:6px}
.weak .eyebrow{color:var(--bad-x)}

@media (prefers-reduced-motion:no-preference){.btn,.opt{transition:transform .08s}.btn:active,.opt:active{transform:scale(.98)}}
:focus-visible{outline:3px solid #3B4FE0;outline-offset:2px}

/* comptes */
.field{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:700}
.input{height:48px;border:1.5px solid var(--field);border-radius:12px;background:#fff;padding:0 14px;font:500 16px var(--font);color:var(--ink);width:100%}
.seg{display:flex;background:#E8EAF4;border-radius:14px;padding:4px;gap:4px}
.seg a{flex:1;height:44px;display:flex;align-items:center;justify-content:center;border-radius:11px;color:var(--muted);font-weight:600;font-size:15px;text-decoration:none}
.seg a.on{background:#fff;color:var(--ink);font-weight:700;box-shadow:0 1px 3px rgba(22,26,51,.12)}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14px;line-height:1.45;font-weight:500}
.check input{width:22px;height:22px;flex:none;margin:1px 0 0}
.box.err{background:var(--bad-t);color:var(--bad-x);font-weight:600}
.box[hidden]{display:none}
.avatar{width:48px;height:48px;border-radius:50%;background:#E8EBFD;color:#2A3BB8;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px;flex:none}
.ico{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;vertical-align:-2px}
details form.in{display:flex;flex-direction:column;gap:12px}
.doc{padding:24px 20px 48px;display:flex;flex-direction:column;gap:12px}
.doc h2{margin-top:14px}
.doc ul{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:4px}
.doc mark{background:var(--warn-t);color:var(--warn-x);padding:0 4px;border-radius:4px}

/* espace classe */
.btn.sm{min-height:44px;font-size:14px;padding:0 16px}
.btn.danger,.linkbtn.danger{color:var(--bad-x)}
.btn.ghost.danger{border-color:#E7B4AE}
.wrap{flex-wrap:wrap}
.mono{font-family:var(--mono)}
input.mono,textarea.mono{font-family:var(--mono);letter-spacing:.5px}
.code{font:700 14px var(--mono);background:var(--ct);color:var(--cx);border-radius:10px;padding:5px 10px;letter-spacing:1px}
.due{font-size:12px;font-weight:800;border-radius:8px;padding:3px 8px;background:#E8EAF4;color:var(--muted);white-space:nowrap}
.due.soon{background:var(--warn-t);color:var(--warn-x)}
.due.late{background:var(--bad-t);color:var(--bad-x)}
.card.dark .due{background:var(--warn-t);color:#5C2D06}
.card.dark .small{color:#C9CEF5}
.hwcard{border-color:var(--c)}
.crumb{display:inline-flex;align-items:center;min-height:36px;font-size:14px;font-weight:700;text-decoration:none}
.linkbtn{background:none;border:0;padding:8px 4px;min-height:40px;font:700 13px var(--font);color:var(--c);cursor:pointer;text-decoration:underline}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px 14px;display:flex;flex-direction:column}
.stat b{font-size:24px;font-weight:800;letter-spacing:-.4px}
.stat span{font-size:13px;color:var(--muted)}
.stat b.mono{font-size:20px;letter-spacing:1px}
.grid{display:grid;grid-template-columns:1fr;gap:12px}
.formrow{display:grid;grid-template-columns:1fr;gap:12px}
.cols{display:flex;flex-direction:column;gap:14px}
.col{display:flex;flex-direction:column;gap:12px;min-width:0}
select.input{appearance:auto}
.area{height:auto;min-height:84px;padding:12px 14px;resize:vertical;line-height:1.45}
.tablewrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:16px}
.tbl{border-collapse:collapse;width:100%;min-width:560px;font-size:14px}
.tbl th,.tbl td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl thead th{font-size:12px;font-weight:800;color:var(--muted);background:#F7F8FC;white-space:normal}
.tbl tbody tr:last-child>*{border-bottom:0}
.tbl tbody th{font-weight:700}
.tbl a{color:var(--ink);text-underline-offset:3px}
.sc{display:inline-block;font-weight:800;font-size:13px;border-radius:8px;padding:2px 8px}
.sc.g{background:var(--ok-t);color:var(--ok-x)}
.sc.m{background:var(--warn-t);color:var(--warn-x)}
.sc.b{background:var(--bad-t);color:var(--bad-x)}
.sc.n{background:#E8EAF4;color:var(--muted)}
.hwrow{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:8px 0;border-top:1px solid var(--line)}
.hwrow:first-of-type{border-top:0}
.kinds{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.kinds legend{font-size:13px;font-weight:700;padding:0;margin-bottom:6px}
.kind{display:flex;gap:12px;align-items:flex-start;border:2px solid var(--line);border-radius:14px;padding:12px 14px;cursor:pointer;line-height:1.35}
.kind.on{border-color:var(--c);background:var(--ct)}
.kind input{width:20px;height:20px;margin:2px 0 0;flex:none}
.qitem{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;border:2px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;font:inherit;color:var(--ink);cursor:pointer;line-height:1.35}
.qitem.on{border-color:var(--c);background:var(--ct)}
.qn{width:26px;height:26px;border-radius:50%;background:#F0F1F8;display:flex;align-items:center;justify-content:center;font-size:13px;flex:none}
.qitem.on .qn{background:var(--c);color:#fff}
.answers{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.answers legend{font-size:13px;font-weight:700;padding:0;margin-bottom:6px}
.ans{display:flex;align-items:center;gap:10px;border-radius:12px;padding:4px 8px;border:2px solid transparent}
.ans.good{border-color:var(--ok);background:var(--ok-t)}
.ans input[type=radio]{width:20px;height:20px;flex:none}
.ans .input{height:44px}
label.ans{min-height:48px;cursor:pointer}
.preview{background:#F0F1F8;border-radius:14px;padding:14px 16px;display:flex;flex-direction:column;gap:6px}

@media (min-width:900px){
  #shell.prof{max-width:1240px;display:grid;grid-template-columns:230px minmax(0,1fr);align-items:start}
  #shell.prof #app{grid-column:2;grid-row:1;padding:32px 36px 48px;gap:18px}
  #shell.prof #nav{grid-column:1;grid-row:1;position:sticky;top:0;left:auto;transform:none;width:auto;max-width:none;height:100vh;flex-direction:column;justify-content:flex-start;gap:6px;background:#161A33;border:0;padding:28px 14px}
  #shell.prof #nav a{flex:none;flex-direction:row;gap:12px;justify-content:flex-start;padding:0 12px;min-height:46px;border-radius:12px;color:#C9CEF5;font-size:15px}
  #shell.prof #nav a.on{background:#2B3160;color:#fff}
  #shell.prof .stats{grid-template-columns:repeat(4,1fr)}
  #shell.prof .grid{grid-template-columns:repeat(2,1fr)}
  #shell.prof .formrow{grid-template-columns:1fr 1fr}
  #shell.prof .cols{flex-direction:row;align-items:flex-start}
  #shell.prof .cols>.col{flex:1}
}
@media (min-width:600px) and (max-width:899px){.stats{grid-template-columns:repeat(4,1fr)}}

/* console Python */
pre.term{background:#0B0D1C;color:#E8EAF4;border-radius:14px;padding:12px 14px;font:14px/1.6 var(--mono);max-height:260px;overflow:auto}
pre.term .prompt{color:#8E94B8}
pre.term .bad,pre.term.err{color:#FFB4AB}
.box code{background:rgba(22,26,51,.08)}