:root{
  --paper:#F5F8FC;--surface:#FFFFFF;--ink:#0E1627;--muted:#54647B;--line:#D8E0EC;--line-soft:#E9EEF6;
  --blue:#2668DE;--blue-ink:#1D52B3;--blue-soft:#EAF1FD;
  --green:#22CC8C;--green-ink:#0A8055;--green-soft:#E4F7EF;
  --amber:#B87606;--amber-soft:#FFF3DA;
  --water:#A9C8F6;--drop:#2668DE;
  --sans:"Nunito",ui-rounded,"SF Pro Rounded",system-ui,-apple-system,"Segoe UI",sans-serif;
  --math:"STIX Two Text","Cambria Math","Times New Roman",serif;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,monospace;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0A1020;--surface:#111A2E;--ink:#E8EEF8;--muted:#9AA9C0;--line:#26324D;--line-soft:#19233A;
    --blue:#6D9CF5;--blue-ink:#A7C3FA;--blue-soft:#15254A;
    --green:#34D399;--green-ink:#6BE3B6;--green-soft:#0E2C24;
    --amber:#F0B24A;--amber-soft:#33260C;
    --water:#34609F;--drop:#8FB4F7;
  }
}
:root[data-theme="dark"]{
  --paper:#0A1020;--surface:#111A2E;--ink:#E8EEF8;--muted:#9AA9C0;--line:#26324D;--line-soft:#19233A;
  --blue:#6D9CF5;--blue-ink:#A7C3FA;--blue-soft:#15254A;
  --green:#34D399;--green-ink:#6BE3B6;--green-soft:#0E2C24;
  --amber:#F0B24A;--amber-soft:#33260C;
  --water:#34609F;--drop:#8FB4F7;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
.wrap{max-width:1080px;margin:0 auto;padding-inline:clamp(16px,4vw,40px);padding-block:clamp(24px,5vw,56px) 40px}
a{color:var(--blue-ink)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}
h1,h2,h3{text-wrap:balance;margin:0}
p{margin:0}
.label{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}

/* En-tête */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:clamp(28px,5vw,48px)}
.top img{height:34px;width:auto}
.top .label{text-align:right}
.hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:center}
.hero h1{font-size:clamp(2.4rem,6vw,4rem);line-height:1.02;font-weight:900;letter-spacing:-.025em}
.hero h1 span{color:var(--blue)}
.lede{font-size:clamp(1.05rem,2vw,1.2rem);color:var(--muted);margin-top:18px;max-width:34em}
.coaches{position:relative;display:flex;justify-content:center;align-items:flex-end;min-height:220px}
.coaches::before{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:min(320px,90%);aspect-ratio:1;border-radius:50%;background:var(--blue-soft)}
.coaches img{position:relative;width:min(190px,46%);height:auto}
.coaches img+img{margin-left:-28px}
.principles{list-style:none;margin:clamp(32px,5vw,52px) 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px);border-top:2px solid var(--ink);padding-top:20px}
.principles strong{display:block;font-weight:800;font-size:1.02rem;line-height:1.3;margin-bottom:6px}
.principles p{color:var(--muted);font-size:.95rem;line-height:1.55}
.toc{margin-top:28px;display:flex;flex-wrap:wrap;gap:8px 10px}
.toc a{text-decoration:none;font-weight:700;font-size:.9rem;padding:6px 12px;border-radius:999px;border:1.5px solid var(--line);color:var(--ink);background:var(--surface)}
.toc a:hover{border-color:var(--blue);color:var(--blue-ink)}
.toc a b{font-family:var(--mono);font-weight:500;color:var(--blue);margin-right:6px;font-size:.8rem}

/* Étapes */
.step{margin-top:clamp(56px,9vw,96px);scroll-margin-top:16px}
.step-head{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 18px;align-items:baseline;margin-bottom:22px}
.step-no{font-family:var(--mono);font-size:.95rem;color:var(--blue);grid-row:span 2;padding-top:6px}
.step-head h2{font-size:clamp(1.6rem,3.4vw,2.2rem);font-weight:900;letter-spacing:-.015em;line-height:1.15}
.step-head p{color:var(--muted);max-width:40em}
.duo{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(16px,2.5vw,28px);align-items:start}
.panel{border-radius:20px;padding:clamp(20px,3vw,30px)}
.math{background:var(--surface);border:1px solid var(--line)}
.kid{background:var(--green-soft)}
.panel>*+*{margin-top:14px}
.panel ul,.panel ol{margin:14px 0 0;padding-left:1.2em}
.panel li+li{margin-top:8px}
.panel li::marker{color:var(--muted)}
.kid-head{display:flex;align-items:center;gap:12px}
.kid-head img{width:64px;height:64px;object-fit:contain;flex:none}
.kid-head .label{color:var(--green-ink)}
.kid p,.kid li{font-size:1.02rem}
.math .label{color:var(--blue-ink)}
.v{font-family:var(--math);font-style:italic;font-size:1.12em;letter-spacing:.01em}
.num{font-variant-numeric:tabular-nums}
.eq{font-family:var(--math);font-size:clamp(1.25rem,2.6vw,1.5rem);line-height:1.5;text-align:center;padding:16px 12px;border-radius:14px;background:var(--blue-soft);color:var(--ink);overflow-x:auto;white-space:nowrap}
.eq i{font-style:italic}
.eq sup{font-size:.62em;vertical-align:.9em;line-height:0}
.eq .sm{font-size:.8em;color:var(--muted);font-style:normal;font-family:var(--sans);font-weight:700}
.frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;line-height:1.25;margin:0 .15em}
.frac>span:first-child{border-bottom:1.5px solid currentColor;padding:0 .2em .05em}
.frac>span:last-child{padding-top:.05em}
.note{font-size:.93rem;color:var(--muted)}
.defs{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px 14px;margin-top:14px}
.defs dt{font-family:var(--math);font-style:italic;font-size:1.25rem;color:var(--blue-ink);line-height:1.3}
.defs dd{margin:0}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:.85rem;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--blue-soft);color:var(--blue-ink)}

/* Tableaux */
.tbl{overflow-x:auto;margin-top:16px}
table{border-collapse:collapse;width:100%;font-size:.93rem;font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line-soft);white-space:nowrap}
th{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:800}
td.up{color:var(--green-ink);font-weight:800}
td.eqv{color:var(--muted);font-weight:700}
td.down{color:var(--amber);font-weight:800}

/* Figures */
figure{margin:clamp(20px,3vw,28px) 0 0}
figcaption{font-size:.9rem;color:var(--muted);margin-top:12px;max-width:52em}
.card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:clamp(16px,3vw,28px)}
.fig-svg{display:block;width:100%;height:auto;color:var(--ink)}
.fig-svg text{font-family:var(--sans);font-size:11.5px;fill:var(--muted);font-weight:700}
.fig-svg .strong{fill:var(--ink);font-weight:800;font-size:13.5px}
.fig-svg .amber{fill:var(--amber)}
@media (max-width:560px){.fig-svg text{font-size:19px}.fig-svg .strong{font-size:21px}}

/* Contrôles */
.controls{display:flex;flex-wrap:wrap;gap:12px 20px;align-items:center;margin-bottom:16px}
.seg{display:inline-flex;gap:4px;padding:4px;border-radius:12px;background:var(--line-soft)}
.seg button{font:inherit;font-size:.9rem;font-weight:800;border:0;background:transparent;color:var(--muted);padding:6px 12px;border-radius:9px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--blue-ink);box-shadow:0 1px 2px rgba(14,22,39,.12)}
.range{display:flex;align-items:center;gap:10px;font-size:.92rem;font-weight:700;color:var(--muted)}
.range output{min-width:3.2em;color:var(--ink);font-variant-numeric:tabular-nums}
input[type=range]{accent-color:var(--blue);width:min(220px,48vw)}
.readouts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:14px}
.readout{background:var(--paper);border-radius:14px;padding:10px 14px}
.readout span{display:block;font-size:.78rem;font-weight:700;color:var(--muted);line-height:1.3}
.readout b{display:block;font-size:1.5rem;font-weight:900;font-variant-numeric:tabular-nums;line-height:1.3}
.legend{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.85rem;font-weight:700;color:var(--muted);margin-bottom:6px}
.legend i{display:inline-block;width:18px;height:0;border-top:3px solid var(--blue);vertical-align:middle;margin-right:6px}
.legend i.dash{border-top:2px dashed var(--amber)}
.legend i.dot{width:10px;height:10px;border:0;border-radius:50%;background:var(--blue)}

/* Barre de 100 points */
.bar100{display:flex;height:56px;border-radius:14px;overflow:hidden;gap:3px}
.bar100 div{display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.85rem;min-width:0;white-space:nowrap;overflow:hidden}
.seg-ok{background:var(--green);color:#063B27}
.seg-gap{background:var(--blue-soft);color:var(--blue-ink)}
.bar-legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px 18px;margin-top:14px;font-size:.92rem}
.bar-legend b{font-variant-numeric:tabular-nums}
.bar-legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:8px;vertical-align:-1px}

/* Les quatre questions */
.q4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) ;gap:10px;align-items:stretch}
.q{background:var(--surface);border:1.5px solid var(--blue);border-radius:16px;padding:14px;text-align:center}
.q b{display:block;font-size:1.05rem;font-weight:900}
.q span{display:block;font-size:.88rem;color:var(--muted);font-weight:700}
.q em{display:block;font-style:normal;font-family:var(--mono);font-size:.8rem;color:var(--blue-ink);margin-top:6px}
.times{text-align:center;font-family:var(--math);font-size:1.6rem;color:var(--muted);margin:6px 0}
.result{max-width:320px;margin:0 auto;background:var(--green-soft);border:1.5px solid var(--green);border-radius:16px;padding:12px;text-align:center}
.result b{display:block;font-weight:900;font-size:1.05rem}
.result span{font-size:.88rem;color:var(--green-ink);font-weight:700}

/* Calculateur */
.calc{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:24px;align-items:center}
.calc-rows{display:grid;gap:12px}
.calc-row{display:grid;grid-template-columns:minmax(0,11em) minmax(0,1fr) 4.6em;gap:10px;align-items:center;font-size:.92rem;font-weight:700;color:var(--muted)}
.calc-row input{width:100%}
.calc-row output{text-align:right;color:var(--ink);font-variant-numeric:tabular-nums}
.chain{font-family:var(--math);font-size:1.15rem;text-align:center;color:var(--muted);line-height:1.8}
.chain b{font-family:var(--sans);color:var(--ink);font-weight:800}
.score{text-align:center;margin-top:6px}
.score b{display:block;font-size:3rem;font-weight:900;line-height:1.1;color:var(--blue);font-variant-numeric:tabular-nums}
.score span{font-size:.9rem;font-weight:700;color:var(--muted)}
.presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.presets button{font:inherit;font-size:.85rem;font-weight:800;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);padding:5px 12px;border-radius:999px;cursor:pointer}
.presets button:hover{border-color:var(--blue);color:var(--blue-ink)}

/* Calendrier */
.cal{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px}
.day{background:var(--paper);border-radius:12px;padding:8px;min-height:92px}
.day>span{display:block;font-family:var(--mono);font-size:.75rem;color:var(--muted);margin-bottom:6px}
.task{display:block;font-size:.8rem;font-weight:800;padding:4px 7px;border-radius:8px;margin-top:4px;line-height:1.25;overflow-wrap:anywhere}
.t-psy{background:var(--blue-soft);color:var(--blue-ink)}
.t-math{background:var(--green-soft);color:var(--green-ink)}
.t-back{box-shadow:inset 0 0 0 2px var(--amber)}
.cal-legend{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:14px;font-size:.88rem;font-weight:700;color:var(--muted)}
.cal-legend span{display:inline-flex;align-items:center;gap:6px}
.cal-legend i{width:14px;height:14px;border-radius:4px;display:inline-block}

/* Fin */
.honest{margin-top:clamp(56px,9vw,96px);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(16px,3vw,32px)}
.honest h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:900;letter-spacing:-.015em;margin-bottom:12px}
.honest .panel{background:var(--surface);border:1px solid var(--line)}
.refs{margin-top:clamp(40px,6vw,64px);border-top:2px solid var(--ink);padding-top:18px}
.refs ol{margin:12px 0 0;padding-left:1.3em;font-size:.92rem;color:var(--muted);display:grid;gap:6px}
.refs cite{font-style:italic;color:var(--ink)}
footer{margin-top:40px;display:flex;flex-wrap:wrap;gap:12px 20px;align-items:center;justify-content:space-between;font-size:.85rem;color:var(--muted)}
footer img{height:26px;width:auto}

@media (max-width:860px){
  .hero,.duo,.calc,.honest{grid-template-columns:minmax(0,1fr)}
  .coaches{min-height:180px;order:-1}
  .principles{grid-template-columns:minmax(0,1fr)}
  .cal{grid-template-columns:repeat(auto-fill,minmax(118px,1fr))}
}
@media (max-width:560px){
  body{font-size:16px}
  .readouts{grid-template-columns:minmax(0,1fr)}
  .q4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .calc-row{grid-template-columns:minmax(0,1fr) 4.6em}
  .calc-row input{grid-column:1/-1;grid-row:2}
  .top .label{display:none}
}
@media (prefers-reduced-motion:no-preference){
  .toc a,.presets button{transition:border-color .15s,color .15s}
}

body{margin:0}html{scroll-behavior:smooth;scroll-padding-top:100px}.step{scroll-margin-top:115px}.model-eyebrow{margin-bottom:28px;color:var(--blue-ink)}.model-version{font-size:13px;color:var(--muted);margin-top:45px}.coaches img{animation:coach-drift 7s ease-in-out infinite}.coaches img+img{animation-delay:-3s}.hero{padding:20px 0}.refs .note{margin:14px 0}.panel{transition:box-shadow .25s}.math:hover{box-shadow:0 10px 30px #1c4c8010}.card{margin-inline:0}.toc a{transition:background .2s,transform .2s}.toc a:hover{background:var(--blue-soft)}
.avatar-paper{mix-blend-mode:multiply}.coaches{isolation:isolate}.coaches img{max-height:280px;object-fit:contain;object-position:bottom}.kid-head{isolation:isolate}.kid-head img{width:70px;height:82px;object-fit:cover;object-position:top;border-radius:12px}.kid-head img[src*="working"]{object-fit:contain}