/* ================= MathQuest — feuille de style unique, mobile first ========= */

:root{
  --accent:#6c5ce7;
  --bg:#f5f6fb;
  --card:#ffffff;
  --ink:#1d2233;
  --muted:#6b7280;
  --line:#e6e8f0;
  --ok:#0ca678;
  --ko:#e8590c;
  --warn:#f59f00;
  --radius:18px;
  --shadow:0 2px 10px rgba(23,25,60,.07), 0 8px 30px rgba(23,25,60,.05);
  --safe-b: env(safe-area-inset-bottom, 0px);
}
html[data-theme="sombre"], :root:has(#dark-force){ color-scheme: dark; }
@media (prefers-color-scheme: dark){
  html[data-theme="auto"]{
    --bg:#12141f; --card:#1b1e2e; --ink:#e8eaf3; --muted:#9aa1b8; --line:#2a2e42;
    --shadow:0 2px 10px rgba(0,0,0,.35);
  }
}
html[data-theme="sombre"]{
  --bg:#12141f; --card:#1b1e2e; --ink:#e8eaf3; --muted:#9aa1b8; --line:#2a2e42;
  --shadow:0 2px 10px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;overflow-x:clip;max-width:100%}
body{
  background:var(--bg); color:var(--ink);
  font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  -webkit-text-size-adjust:100%;
  padding-bottom: calc(72px + var(--safe-b));
  overflow-x:clip;
}
body.focus{padding-bottom:0}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.25;margin:0 0 .5em}
h1{font-size:1.5rem}
h2{font-size:1.15rem}
h3{font-size:1rem}
p{margin:0 0 .8em}
small{color:var(--muted)}

/* ---------------- barre du haut ---------------- */
.topbar{
  position:sticky;top:0;z-index:30;
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;background:var(--card);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:6px;font-weight:800;letter-spacing:-.3px}
.brand-icon{font-size:1.25rem}
.brand-name{font-size:.95rem}
@media (max-width:380px){.brand-name{display:none}}
.topstats{display:flex;gap:6px;margin-left:auto;align-items:center;flex-wrap:nowrap}
.chip{
  display:inline-flex;align-items:center;gap:4px;
  background:var(--bg);border:1px solid var(--line);
  padding:4px 9px;border-radius:999px;font-size:.8rem;font-weight:700;white-space:nowrap;
}
.chip-streak{color:#e8590c}
.chip-gem{color:#1c7ed6}
.avatar{
  width:36px;height:36px;border-radius:50%;display:grid;place-items:center;
  background:color-mix(in srgb, var(--accent) 18%, transparent);
  font-size:1.2rem;flex:0 0 auto;
}
.xpbar{position:sticky;top:57px;z-index:29;height:4px;background:var(--line)}
.xpbar i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),#00cec9);transition:width .6s}

/* ---------------- contenu ---------------- */
main{max-width:760px;margin:0 auto;padding:16px 14px 8px}
.main-focus{max-width:680px;padding:0 14px}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;box-shadow:var(--shadow);margin-bottom:14px;
}
.card.tight{padding:12px}
.row{display:flex;gap:10px;align-items:center}
.row.wrap{flex-wrap:wrap}
.spread{justify-content:space-between}
.grow{flex:1;min-width:0}
.muted{color:var(--muted)}
.center{text-align:center}
.mt{margin-top:14px}

/* ---------------- boutons ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:none;border-radius:14px;padding:13px 18px;font-size:1rem;font-weight:700;
  background:var(--accent);color:#fff;cursor:pointer;
  box-shadow:0 3px 0 color-mix(in srgb, var(--accent) 60%, #000);
  transition:transform .08s, box-shadow .08s;
  font-family:inherit;
}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 color-mix(in srgb, var(--accent) 60%, #000)}
.btn[disabled]{opacity:.5;pointer-events:none}
.btn.block{width:100%}
.btn.ghost{background:var(--card);color:var(--ink);border:2px solid var(--line);box-shadow:none}
.btn.ok{background:var(--ok);box-shadow:0 3px 0 #087f5b}
.btn.sm{padding:8px 12px;font-size:.85rem;border-radius:11px}

/* ---------------- accueil ---------------- */
.hero{
  background:linear-gradient(135deg,var(--accent),#00b894);
  color:#fff;border-radius:22px;padding:18px;margin-bottom:14px;
  box-shadow:var(--shadow);
}
.hero h1{font-size:1.35rem;margin-bottom:2px}
.hero .sub{opacity:.9;font-size:.9rem}
.goal{margin-top:14px}
.goal .track{height:10px;border-radius:999px;background:rgba(255,255,255,.3);overflow:hidden}
.goal .track i{display:block;height:100%;background:#fff;border-radius:999px;transition:width .6s}
.goal .lbl{display:flex;justify-content:space-between;font-size:.8rem;margin-top:6px}

.tiles{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.tile{
  background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;
  display:flex;flex-direction:column;gap:2px;box-shadow:var(--shadow);
}
.tile .ic{font-size:1.5rem}
.tile .t{font-weight:800;font-size:.95rem}
.tile .d{font-size:.78rem;color:var(--muted)}
.tile.wide{grid-column:1 / -1}

.spark{display:flex;gap:4px;align-items:flex-end;height:44px}
.spark i{flex:1;background:color-mix(in srgb,var(--accent) 55%,transparent);border-radius:3px 3px 0 0;min-height:3px}
.spark i.today{background:var(--accent)}

/* ---------------- parcours (carte des chapitres) ---------------- */
.domain{margin-bottom:18px}
.domain h2{display:flex;align-items:center;gap:8px;font-size:1.05rem}
.path{position:relative;padding-left:6px}
.node{
  display:flex;gap:12px;align-items:center;padding:12px;margin-bottom:10px;
  background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);
  position:relative;
}
.node.locked{opacity:.55}
.node .bubble{
  width:48px;height:48px;flex:0 0 auto;border-radius:50%;display:grid;place-items:center;
  font-weight:800;font-size:1.1rem;color:#fff;
  background:conic-gradient(var(--accent) calc(var(--m) * 1%), var(--line) 0);
  position:relative;
}
.node .bubble b{
  position:absolute;inset:5px;border-radius:50%;background:var(--card);color:var(--ink);
  display:grid;place-items:center;font-size:.8rem;
}
.node .stars{color:var(--warn);letter-spacing:1px;font-size:.85rem}
.node .title{font-weight:700}
.node .meta{font-size:.78rem;color:var(--muted)}

/* ---------------- leçon ---------------- */
.lesson-cards{display:flex;gap:12px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding:4px 2px 12px;margin:0;max-width:100%;-webkit-overflow-scrolling:touch}
.lesson-card{
  flex:0 0 min(88%, 460px);scroll-snap-align:center;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;box-shadow:var(--shadow);
}
.lesson-card .kind{
  display:inline-block;font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.5px;
  padding:3px 9px;border-radius:999px;margin-bottom:8px;
}
.k-notion{background:#e7f5ff;color:#1971c2}
.k-methode{background:#e6fcf5;color:#087f5b}
.k-exemple{background:#fff9db;color:#e67700}
.k-piege{background:#fff0f0;color:#c92a2a}
.k-astuce{background:#f3f0ff;color:#5f3dc4}
.k-culture{background:#f1f3f5;color:#495057}
html[data-theme="sombre"] .k-notion,html[data-theme="sombre"] .k-methode,
html[data-theme="sombre"] .k-exemple,html[data-theme="sombre"] .k-piege,
html[data-theme="sombre"] .k-astuce,html[data-theme="sombre"] .k-culture{filter:brightness(.8) saturate(1.4)}
.dots{display:flex;gap:6px;justify-content:center;margin:-4px 0 14px}
.dots i{width:7px;height:7px;border-radius:50%;background:var(--line)}
.dots i.on{background:var(--accent);width:20px;border-radius:999px}

/* ---------------- exercice ---------------- */
.play-head{
  display:flex;align-items:center;gap:10px;padding:12px 0;position:sticky;top:0;
  background:var(--bg);z-index:20;
}
.play-head .quit{font-size:1.4rem;line-height:1;color:var(--muted)}
.pbar{flex:1;height:12px;border-radius:999px;background:var(--line);overflow:hidden}
.pbar i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),#00cec9);transition:width .35s}
.combo{font-weight:800;font-size:.85rem;color:var(--warn)}

.qcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.consigne{font-size:.8rem;font-weight:800;text-transform:uppercase;letter-spacing:.6px;color:var(--accent);margin-bottom:10px}
.enonce{font-size:1.08rem;margin-bottom:16px}
.enonce p:last-child{margin-bottom:0}
.enonce .fig{width:100%;max-width:320px;height:auto;display:block;margin:10px auto}
.fig .lbl{font:600 13px system-ui;fill:var(--ink)}
.fig .ang{font:600 12px system-ui;fill:#c2410c}

.opts{display:grid;gap:10px}
.opt{
  border:2px solid var(--line);background:var(--card);border-radius:14px;padding:14px;
  text-align:left;font-size:1rem;cursor:pointer;color:var(--ink);font-family:inherit;
  transition:border-color .12s, background .12s, transform .08s;
}
.opt:active{transform:scale(.985)}
.opt.sel{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}
.opt.good{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,transparent)}
.opt.bad{border-color:var(--ko);background:color-mix(in srgb,var(--ko) 12%,transparent)}

.answer-input{
  width:100%;font-size:1.25rem;padding:14px;border-radius:14px;border:2px solid var(--line);
  background:var(--card);color:var(--ink);text-align:center;font-family:inherit;
}
.answer-input:focus{outline:none;border-color:var(--accent)}
.input-wrap{display:flex;align-items:center;gap:8px}
.input-wrap .unit{font-weight:700;color:var(--muted)}

/* clavier maths */
.mathkeys{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin-top:10px}
.mathkeys button{
  padding:10px 0;border-radius:10px;border:1px solid var(--line);background:var(--bg);
  font-size:1rem;font-weight:700;color:var(--ink);cursor:pointer;font-family:inherit;
}

/* vrai-faux rapide */
.vf-item{display:flex;gap:8px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.vf-item:last-child{border-bottom:none}
.vf-item .txt{flex:1}
.vf-btn{border:2px solid var(--line);background:var(--card);border-radius:10px;padding:7px 12px;font-weight:800;cursor:pointer;color:var(--ink);font-family:inherit}
.vf-btn.sel{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent)}
.vf-btn.good{border-color:var(--ok);color:var(--ok)}
.vf-btn.bad{border-color:var(--ko);color:var(--ko)}
.timer{height:6px;border-radius:999px;background:var(--line);overflow:hidden;margin-bottom:12px}
.timer i{display:block;height:100%;background:var(--warn);transition:width 1s linear}

/* appariement */
.match{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.match .col{display:grid;gap:8px}
.mitem{border:2px solid var(--line);border-radius:12px;padding:12px 10px;background:var(--card);cursor:pointer;text-align:center;font-family:inherit;color:var(--ink);font-size:.95rem}
.mitem.sel{border-color:var(--accent)}
.mitem.done{border-style:dashed;opacity:.5}
.mitem[data-pair]{border-color:var(--ok)}

/* ordonner / tri */
.sortable{display:grid;gap:8px}
.sitem{
  border:2px solid var(--line);border-radius:12px;padding:12px;background:var(--card);
  display:flex;align-items:center;gap:10px;cursor:grab;user-select:none;
}
.sitem .handle{color:var(--muted);font-size:1.1rem}
.sitem.drag{opacity:.4}
.sitem.over{border-color:var(--accent)}
.baskets{display:grid;gap:10px;margin-top:12px}
.basket{border:2px dashed var(--line);border-radius:14px;padding:10px;min-height:64px}
.basket h4{margin:0 0 6px;font-size:.85rem;color:var(--muted)}
.basket .items,.pool{display:flex;flex-wrap:wrap;gap:6px}
.token{border:2px solid var(--line);border-radius:10px;padding:8px 10px;background:var(--card);cursor:pointer;font-size:.95rem}
.token.sel{border-color:var(--accent)}
.token.good{border-color:var(--ok)}
.token.bad{border-color:var(--ko)}

/* trous */
.gap-input{
  display:inline-block;min-width:56px;text-align:center;border:none;border-bottom:3px solid var(--accent);
  background:transparent;font-size:1.05rem;font-weight:700;color:var(--ink);padding:2px 4px;font-family:inherit;
}
.gap-input:focus{outline:none;background:color-mix(in srgb,var(--accent) 8%,transparent)}

/* chasse à l'erreur */
.lines{display:grid;gap:8px}
.line{border:2px solid var(--line);border-radius:12px;padding:12px;background:var(--card);cursor:pointer;display:flex;gap:10px}
.line .no{color:var(--muted);font-weight:800;flex:0 0 auto}
.line.sel{border-color:var(--accent)}
.line.good{border-color:var(--ok)}
.line.bad{border-color:var(--ko)}

/* repère */
.grid-wrap{display:flex;justify-content:center}
.grid-svg{width:100%;max-width:340px;height:auto;touch-action:manipulation;cursor:crosshair}
.grid-svg .ax{stroke:var(--muted);stroke-width:1.2}
.grid-svg .gr{stroke:var(--line);stroke-width:.7}
.grid-svg text{font:10px system-ui;fill:var(--muted)}

/* curseur */
.slider{width:100%;accent-color:var(--accent);height:34px}
.slider-val{font-size:1.6rem;font-weight:800;text-align:center;margin:6px 0}

/* correction */
.verdict{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  background:var(--card);border-top:1px solid var(--line);
  padding:16px 14px calc(16px + var(--safe-b));
  box-shadow:0 -6px 24px rgba(0,0,0,.12);
  transform:translateY(110%);transition:transform .28s cubic-bezier(.2,.9,.3,1.2);
  max-height:72vh;overflow:auto;
}
.verdict.show{transform:none}
.verdict.win{border-top:4px solid var(--ok)}
.verdict.lose{border-top:4px solid var(--ko)}
.verdict h3{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.verdict .sol{font-weight:700;margin-bottom:8px}
.steps{margin:0;padding-left:0;list-style:none;counter-reset:s}
.steps li{
  counter-increment:s;position:relative;padding:8px 0 8px 34px;border-bottom:1px dashed var(--line);
  font-size:.95rem;
}
.steps li:last-child{border-bottom:none}
.steps li::before{
  content:counter(s);position:absolute;left:0;top:8px;width:23px;height:23px;border-radius:50%;
  background:color-mix(in srgb,var(--accent) 15%,transparent);color:var(--accent);
  display:grid;place-items:center;font-size:.75rem;font-weight:800;
}
.xp-pop{color:var(--ok);font-weight:800}

/* fin de session */
.result{text-align:center;padding:26px 0}
.result .big{font-size:3rem;margin-bottom:4px}
.result .score{font-size:2rem;font-weight:800}
.badge-pop{display:flex;gap:10px;align-items:center;background:var(--card);border:2px solid var(--warn);border-radius:14px;padding:12px;margin:10px 0}
.breakdown{text-align:left;margin-top:16px}
.bd-item{display:flex;gap:8px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line);font-size:.9rem}
.bd-bar{flex:0 0 70px;height:7px;border-radius:999px;background:var(--line);overflow:hidden}
.bd-bar i{display:block;height:100%;background:var(--ok)}

/* ---------------- tableaux, code, maths ---------------- */
.md-table{width:100%;border-collapse:collapse;margin:8px 0;font-size:.9rem;display:block;overflow-x:auto}
.md-table th,.md-table td{border:1px solid var(--line);padding:6px 9px;text-align:center;white-space:nowrap}
.md-table th{background:var(--bg);font-weight:700}
pre.code{background:#1b1e2e;color:#e8eaf3;border-radius:12px;padding:12px;overflow-x:auto;font-size:.85rem;line-height:1.5}
code{background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:1px 5px;font-size:.9em}
pre.code code{background:none;border:none;padding:0}
.katex{font-size:1.05em}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:2px 0}

/* ---------------- barre du bas ---------------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:35;
  display:grid;grid-template-columns:repeat(5,1fr);
  background:var(--card);border-top:1px solid var(--line);
  padding-bottom:var(--safe-b);
}
.tabbar a{
  display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:9px 0 8px;font-size:.68rem;color:var(--muted);font-weight:600;
}
.tabbar a span{font-size:1.25rem;line-height:1}
.tabbar a.on{color:var(--accent)}

/* ---------------- divers ---------------- */
.toast{
  position:fixed;left:50%;bottom:calc(84px + var(--safe-b));transform:translateX(-50%);
  background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:999px;
  font-size:.9rem;font-weight:700;z-index:60;box-shadow:var(--shadow);
}
.login{max-width:380px;margin:8vh auto;padding:0 18px}
.login .card{padding:22px}
.field{margin-bottom:12px}
.field label{display:block;font-size:.82rem;font-weight:700;margin-bottom:5px;color:var(--muted)}
.field input,.field select{
  width:100%;padding:12px;border-radius:12px;border:2px solid var(--line);
  background:var(--card);color:var(--ink);font-size:1rem;font-family:inherit;
}
.field input:focus,.field select:focus{outline:none;border-color:var(--accent)}
.error{background:#fff0f0;color:#c92a2a;border-radius:12px;padding:10px;margin-bottom:12px;font-size:.9rem}
.ok-msg{background:#e6fcf5;color:#087f5b;border-radius:12px;padding:10px;margin-bottom:12px;font-size:.9rem}

.heat{display:grid;grid-template-columns:repeat(15,1fr);gap:3px}
.heat i{aspect-ratio:1;border-radius:3px;background:var(--line)}
.heat i[data-l="1"]{background:color-mix(in srgb,var(--accent) 25%,transparent)}
.heat i[data-l="2"]{background:color-mix(in srgb,var(--accent) 50%,transparent)}
.heat i[data-l="3"]{background:color-mix(in srgb,var(--accent) 75%,transparent)}
.heat i[data-l="4"]{background:var(--accent)}

.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:10px}
.badge-item{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;text-align:center}
.badge-item.off{opacity:.35;filter:grayscale(1)}
.badge-item .ic{font-size:1.8rem}
.badge-item .nm{font-size:.78rem;font-weight:700;margin-top:4px}
.badge-item .ds{font-size:.68rem;color:var(--muted)}

.lead{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.lead:last-child{border-bottom:none}
.lead .pos{font-weight:800;width:22px;color:var(--muted)}
.lead .av{font-size:1.4rem}
.lead .xp{margin-left:auto;font-weight:800}

@media (min-width:720px){
  .tiles{grid-template-columns:repeat(3,1fr)}
  .lesson-card{flex:0 0 min(62%, 460px)}
  body{padding-bottom:24px}
  .tabbar{position:sticky;top:61px;bottom:auto;border-top:none;border-bottom:1px solid var(--line);
          max-width:760px;margin:0 auto;border-radius:0 0 16px 16px}
}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important}
}
.pop{animation:pop .4s cubic-bezier(.2,.9,.3,1.4)}
@keyframes pop{0%{transform:scale(.6);opacity:0}100%{transform:none;opacity:1}}
.shake{animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}