:root{
  --ink:#23275c; --muted:#5a5f8e; --paper:#fffdf6; --bg:#fbf7ea; --line:#dde8f6;
  --yel:#ffe94d; --yel-soft:#fff8b8; --pink:#ff5c8a; --pink-soft:#ffe3ea; --blue:#4f8cff; --blue-soft:#eaf2ff;
  --green:#1f9d5e; --green-soft:#dcf7e8; --orange:#ff9f1c; --purple:#7b4fd0;
  --f-title:'Permanent Marker','Chalkboard SE','Comic Sans MS',cursive;
  --f-hand:'Caveat','Segoe Print',cursive;
  --f-body:'Nunito','Segoe UI',system-ui,-apple-system,sans-serif;
  --shadow:0 4px 0 var(--ink);
}
*{box-sizing:border-box}
html{color-scheme:light;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--f-body);font-size:1.0625rem;line-height:1.6;color:var(--ink);
  background:var(--bg) repeating-linear-gradient(to bottom,transparent 0 31px,var(--line) 31px 32px);background-attachment:local}
h1,h2,h3{line-height:1.15;margin:0 0 .6rem}
h1{font-family:var(--f-title);font-weight:400;font-size:clamp(1.7rem,5.5vw,2.6rem)}
h3{font-family:var(--f-title);font-weight:400;font-size:1.3rem;margin-top:1.8rem}
p{margin:.5rem 0}
a{color:inherit}
mark{background:linear-gradient(transparent 52%,var(--yel) 52% 92%,transparent 92%);color:inherit;padding:0 .12em}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px;border-radius:6px}
button{font-family:inherit;color:inherit}
.center{text-align:center}
.small{font-size:.9rem;color:var(--muted)}
.wrap{max-width:920px;margin:0 auto;padding:1rem 16px 5rem}
.h2{font-family:var(--f-title);font-weight:400;font-size:1.5rem;margin:2rem 0 .8rem}

/* fração empilhada */
.fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;line-height:1.15;margin:0 .18em;font-size:.92em}
.fr i{font-style:normal;padding:0 .22em}
.fr i:first-child{border-bottom:2px solid currentColor}
sup{font-size:.7em;line-height:0}

/* botões */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:48px;padding:.65rem 1.3rem;font-weight:800;font-size:1rem;text-decoration:none;cursor:pointer;
  background:var(--yel);color:var(--ink);border:3px solid var(--ink);border-radius:14px;box-shadow:var(--shadow);transition:transform .08s,box-shadow .08s}
.btn:hover{transform:translateY(-1px);box-shadow:0 5px 0 var(--ink)}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 var(--ink)}
.btn.sec{background:#fff}
.btn.big{font-size:1.1rem;padding:.8rem 1.5rem}
.btn.good{background:#52d98c}.btn.bad{background:var(--pink);color:#fff}
.link{background:none;border:0;padding:0;text-decoration:underline;cursor:pointer;color:var(--muted);font-size:.95rem}
.iconbtn{width:44px;height:44px;border-radius:50%;border:3px solid var(--ink);background:#fff;font-size:1.1rem;font-weight:900;cursor:pointer}

/* topo */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.4rem 16px;background:var(--paper);border-bottom:3px solid var(--ink)}
.brand{display:flex;align-items:center;gap:.5rem;text-decoration:none;font-family:var(--f-title);font-size:1.25rem}
.chips{display:flex;gap:.4rem;flex-wrap:wrap;justify-content:flex-end}
.chip{padding:.15rem .7rem;border:2px solid var(--ink);border-radius:999px;background:#fff;font-weight:800;font-size:.9rem;white-space:nowrap}
.chip.lvl{background:var(--yel)}

/* home */
.hero{display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:center;padding:1rem 0}
.hero h1{font-size:clamp(2rem,7vw,3.4rem)}
.kicker{font-family:var(--f-hand);font-size:1.35rem;color:var(--muted);margin:0}
.bubble{position:relative;background:#fff;border:3px solid var(--ink);border-radius:16px;padding:.8rem 1rem;margin:.6rem 0 1rem;font-weight:700}
.bubble::before{content:'';position:absolute;left:-14px;top:22px;border:9px solid transparent;border-right:12px solid var(--ink)}
.hero-cta{display:flex;gap:.7rem;flex-wrap:wrap}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:.8rem;margin:.5rem 0 1rem}
.stat{background:#fff;border:3px solid var(--ink);border-radius:16px;padding:.8rem 1rem}
.stat b{display:block;font-family:var(--f-title);font-weight:400;font-size:1.5rem}
.stat span,.stat small{display:block;color:var(--muted);font-weight:700;font-size:.9rem}
.uprog{height:12px;border:2px solid var(--ink);border-radius:999px;background:#fff;overflow:hidden;margin-top:.4rem}
.uprog i{display:block;height:100%;background:var(--green);border-radius:999px;transition:width .5s}
.uprog.xp i{background:var(--purple)}.uprog.low i{background:var(--pink)}
.sumario{text-align:center;margin:2.2rem 0 1.4rem}
.sumario span{display:inline-block;font-family:var(--f-title);font-weight:400;font-size:clamp(2rem,8vw,3.4rem);letter-spacing:.06em;padding:.1em .6em;background:var(--yel);border:4px solid var(--ink);box-shadow:7px 7px 0 var(--ink);transform:rotate(-1.5deg)}
.units{display:grid;gap:1.6rem}
.unit{background:#fff;border:3px solid var(--ink);border-radius:18px;padding:1rem 1rem .6rem;box-shadow:7px 7px 0 var(--c)}
.unit-h{display:grid;grid-template-columns:auto 1fr auto;gap:.8rem;align-items:center}
.unit-n{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:var(--c);border:3px solid var(--ink);font-family:var(--f-title);font-size:1.4rem}
.unit-h h3{margin:0;font-size:1.1rem}
.unit-h h3 span{font-family:var(--f-body);font-weight:900;font-size:1.2rem}
.unit-h p{margin:0;color:var(--muted);font-size:.92rem;font-weight:700}
.unit-e{font-size:2rem}
.lrows{list-style:none;margin:.6rem 0 0;padding:0}
.lrow{display:grid;grid-template-columns:2.6rem 1fr auto;gap:.6rem;align-items:center;min-height:52px;padding:.4rem .3rem;text-decoration:none;border-top:2px dashed #d8def0}
.lrow:hover{background:var(--yel-soft)}
.ln{font-family:var(--f-title);color:var(--muted)}
.lt{font-weight:800}
.stars{white-space:nowrap}.stars b{color:#d3d8ea;font-size:1.2rem;font-weight:400;margin-left:1px}.stars b.on{color:var(--orange);text-shadow:0 0 0 var(--ink),1px 1px 0 var(--ink)}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.7rem}
.badge{background:#fff;border:3px dashed #c4c9e0;border-radius:14px;padding:.7rem;text-align:center;filter:grayscale(1);opacity:.6}
.badge.got{border:3px solid var(--ink);filter:none;opacity:1;background:var(--yel-soft)}
.badge span{display:block;font-size:1.8rem}.badge small{display:block;font-size:.78rem;color:var(--muted);line-height:1.3}
.foot{margin-top:2.5rem;text-align:center;color:var(--muted)}

/* aula */
.crumbs{display:flex;gap:1rem;flex-wrap:wrap;font-weight:800;margin:.4rem 0 1rem;color:var(--muted)}
.lhead{display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:center;background:var(--c);border:3px solid var(--ink);border-radius:18px;padding:1rem 1.2rem;box-shadow:6px 6px 0 var(--ink)}
.lhead .le{font-size:2.6rem}.lhead h1{margin:0}.blurb{margin:.3rem 0 0;font-weight:700}
.lhead .kicker{color:var(--ink)}
.paper{background:var(--paper);border:3px solid var(--ink);border-left:10px double #ff9db8;border-radius:6px 18px 18px 6px;padding:.4rem 1.2rem 1.4rem;margin:1.4rem 0}
.learn h3{display:inline-block;background:linear-gradient(transparent 55%,var(--yel) 55% 92%,transparent 92%);padding:0 .2rem;margin-bottom:.4rem}
.def,.ex,.tip,.warn,.sum{position:relative;margin:1rem 0;padding:.9rem 1rem .9rem 1rem;border-radius:14px;border:3px solid var(--ink);background:#fff}
.lbl{display:inline-block;font-family:var(--f-title);font-weight:400;font-size:.8rem;letter-spacing:.05em;background:var(--ink);color:#fff;padding:.1rem .6rem;border-radius:6px;margin:0 .6rem .3rem 0;transform:rotate(-2deg)}
.def{background:var(--blue-soft);border-color:var(--blue)}.def .lbl{background:var(--blue)}
.ex{background:#fff9ec;border-color:var(--orange)}.ex .lbl{background:var(--orange);color:var(--ink)}
.tip{background:#f0fbf4;border:3px dashed var(--green)}.tip .lbl{background:var(--green)}
.warn{background:var(--pink-soft);border-color:var(--pink)}.warn .lbl{background:var(--pink)}
.sum{background:var(--yel-soft);border-style:solid}
.steps{margin:.4rem 0 0;padding-left:1.4rem}.steps li{margin:.25rem 0;padding-left:.2rem}
.steps.big{font-size:1.05rem}
ul{padding-left:1.3rem}li{margin:.2rem 0}
.tb{border-collapse:separate;border-spacing:0;width:100%;margin:.8rem 0;background:#fff;border:3px solid var(--ink);border-radius:12px;overflow:hidden;font-size:.97rem}
.tb th{background:var(--yel);text-align:left;padding:.5rem .7rem;border-bottom:3px solid var(--ink)}
.tb td{padding:.5rem .7rem;border-top:2px solid #e1e5f3;vertical-align:middle}
.tb tr:first-child td{border-top:0}
.calc{font:700 1.1rem ui-monospace,Consolas,monospace;margin:.4rem 0 0;line-height:1.4}
.fig{display:block;max-width:100%;height:auto;margin:.6rem auto}
.wid{border:3px dashed var(--blue);border-radius:16px;background:var(--blue-soft);padding:1rem;margin:1rem 0}
.wid-in{display:grid;gap:1rem;align-items:center}
@media(min-width:640px){.wid-in{grid-template-columns:1fr 1fr}}
.wid label{display:block;font-weight:800;margin-bottom:.6rem}
.wid input[type=range]{width:100%;accent-color:var(--pink);height:32px}
.wid-out{font-weight:800;font-size:1.15rem;background:#fff;border:2px solid var(--ink);border-radius:10px;padding:.5rem .8rem}
.pk{color:var(--pink)}
.pn{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-weight:800;margin:1rem 0 6rem}
.pn a{color:var(--muted);text-decoration:none;padding:.5rem 0}.pn a:hover{color:var(--ink);text-decoration:underline}
.cta{position:fixed;left:0;right:0;bottom:0;z-index:15;background:var(--paper);border-top:3px solid var(--ink);padding:.6rem 16px calc(.6rem + env(safe-area-inset-bottom,0px))}
.cta-in{max-width:920px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.guide{display:flex;align-items:center;gap:.6rem;font-weight:800}

/* quiz */
.quiz{min-height:100dvh;display:flex;flex-direction:column;max-width:780px;margin:0 auto;background:var(--paper);border-left:3px solid var(--ink);border-right:3px solid var(--ink)}
.qhead{display:flex;align-items:center;gap:.8rem;padding:.7rem 16px;position:sticky;top:0;background:var(--paper);z-index:5}
.bar{flex:1;height:18px;border:3px solid var(--ink);border-radius:999px;background:#fff;overflow:hidden}
.bar i{display:block;height:100%;background:var(--green);transition:width .4s}
.combo{font-weight:900;color:#b7bdd6;min-width:3.2rem;text-align:right}.combo.on{color:var(--orange)}
.qmain{flex:1;padding:.5rem 16px 2rem}
.quiz:has(.sheet) .qmain{padding-bottom:50dvh}
.qtag{font-family:var(--f-hand);font-size:1.3rem;color:var(--muted);margin:0}
.qtext{font-size:1.25rem;font-weight:800;line-height:1.5;margin:.4rem 0 .8rem}
.qfig{background:#fff;border:3px solid var(--ink);border-radius:14px;padding:.5rem;margin:.5rem 0 1rem;overflow-x:auto}
.qfig .tb{margin:.2rem 0}
.opts{display:grid;gap:.7rem}
.opt{display:flex;gap:.8rem;align-items:center;width:100%;min-height:56px;text-align:left;padding:.7rem 1rem;border:3px solid #c9d0ea;border-radius:14px;background:#fff;font-weight:800;font-size:1.05rem;cursor:pointer;transition:background .1s,border-color .1s}
.opt:hover:not(:disabled){border-color:var(--blue);background:var(--blue-soft)}
.opt .k{display:grid;place-items:center;flex:none;width:32px;height:32px;border:2px solid currentColor;border-radius:8px;font-size:.9rem;color:var(--muted)}
.opt.sel{border-color:var(--blue);background:var(--blue-soft)}
.opt.right{border-color:var(--green);background:var(--green-soft)}.opt.wrong{border-color:var(--pink);background:var(--pink-soft)}
.opt:disabled{cursor:default}
.ansrow{display:flex;align-items:center;gap:.6rem}
.pairrow{display:grid;gap:.7rem;max-width:340px}.lab{font-weight:900;min-width:4.5rem;text-align:right}
.ans{font:800 1.4rem var(--f-body);padding:.7rem 1rem;border:3px solid var(--ink);border-radius:14px;width:100%;max-width:320px;background:#fff;color:var(--ink)}
.ans:focus{outline:3px solid var(--blue);outline-offset:2px}
.ans:disabled{background:#f1f1f1}

.ansrow .uni{font-weight:800}
.fmt{font-size:.85rem;color:var(--muted);margin:.4rem 0 0}
.note{margin:.8rem 0 0;padding:.7rem 1rem;background:var(--yel-soft);border:3px solid var(--orange);border-radius:12px;font-weight:700}
.hintbox{display:flex;gap:.6rem;align-items:center;margin-top:1rem;padding:.7rem 1rem;background:#f0fbf4;border:3px dashed var(--green);border-radius:14px;font-weight:700}
.hintbox p{margin:0}
.qfoot{position:sticky;bottom:0;display:flex;justify-content:space-between;gap:.8rem;padding:.8rem 16px;background:var(--paper);border-top:3px solid var(--ink)}
.qfoot .btn:last-child{margin-left:auto;min-width:150px}
.qfoot.hide{display:none}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:30;max-height:72dvh;overflow:auto;border-top:4px solid var(--ink);animation:up .25s ease-out}
.sheet.ok{background:var(--green-soft)}.sheet.bad{background:var(--pink-soft)}
.sh-in{max-width:780px;margin:0 auto;padding:1rem 16px 1.2rem;display:grid;grid-template-columns:auto 1fr;gap:.4rem 1rem;align-items:start}
.sh-in .btn{grid-column:1/-1;width:100%}
@media(min-width:700px){.sh-in .btn{grid-column:2;width:auto;justify-self:end}}
.sh-txt h2{font-family:var(--f-title);font-weight:400;font-size:1.35rem;margin:0 0 .3rem}
.sheet.ok h2{color:var(--green)}.sheet.bad h2{color:#d6285b}
.yours,.where,.rightans{margin:.3rem 0}
.where{background:#fff;border:2px solid var(--pink);border-radius:10px;padding:.5rem .8rem}
.sol{background:#fff;border:2px solid var(--ink);border-radius:10px;padding:.6rem .8rem;margin:.5rem 0;font-weight:600}
.sheet summary{cursor:pointer;font-weight:800}
@keyframes up{from{transform:translateY(40px);opacity:0}to{transform:none;opacity:1}}

/* resultado */
.rcard{text-align:center;background:#fff;border:3px solid var(--ink);border-radius:20px;box-shadow:7px 7px 0 var(--yel);padding:1.4rem 1rem;margin:1rem 0}
.rcard h1{margin:.3rem 0}.lname{font-weight:800;color:var(--muted);margin:0}
.big{font-size:1.5rem;font-weight:900}
.bigstars .stars b{font-size:3rem}
.rstats{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin:1rem 0}
.rstats div{background:var(--yel-soft);border:3px solid var(--ink);border-radius:14px;padding:.5rem 1rem;min-width:110px}
.rstats b{display:block;font-family:var(--f-title);font-weight:400;font-size:1.4rem}.rstats span{font-size:.85rem;font-weight:700;color:var(--muted)}
.newbadge{display:inline-block;background:var(--yel);border:2px solid var(--ink);border-radius:999px;padding:.1rem .8rem;font-weight:800;margin:.2rem}
.actions{display:flex;gap:.8rem;flex-wrap:wrap;justify-content:center;margin:1.2rem 0}
.rev{background:#fff;border:3px solid var(--ink);border-radius:12px;padding:.6rem .9rem;margin:.6rem 0}
.rev summary{cursor:pointer;font-weight:800}
.by{display:grid;gap:.5rem}.byrow{display:grid;grid-template-columns:1fr 120px 3rem;gap:.8rem;align-items:center;text-decoration:none;background:#fff;border:3px solid var(--ink);border-radius:12px;padding:.5rem .8rem;font-weight:800}
.byrow .uprog{margin:0}
.hist{padding-left:1.2rem;font-weight:700}
@media(max-width:560px){.byrow{grid-template-columns:1fr 3rem}.byrow .uprog{grid-column:1/-1;grid-row:2}}

/* boas-vindas */
.welcome{min-height:100dvh;display:grid;place-items:center;padding:1rem}
.welcome-card{max-width:520px;text-align:center;background:var(--paper);border:3px solid var(--ink);border-radius:22px;box-shadow:8px 8px 0 var(--yel);padding:1.6rem 1.4rem}
.welcome-card form{display:grid;gap:.7rem;margin-top:1.2rem}
.welcome-card label{font-weight:800}
.welcome-card input{font:800 1.3rem var(--f-body);padding:.7rem 1rem;border:3px solid var(--ink);border-radius:14px;text-align:center}

/* toast e confete */
.toast{position:fixed;top:70px;left:50%;transform:translateX(-50%);z-index:80;background:var(--ink);color:#fff;font-weight:800;padding:.6rem 1.2rem;border-radius:999px;transition:opacity .4s}
.toast.out{opacity:0}
.confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:70}
.confetti i{position:absolute;top:-16px;width:10px;height:16px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{top:105%;margin-left:40px}}
pre{white-space:pre-wrap;background:#fff;border:2px solid var(--ink);border-radius:10px;padding:1rem}
.owl{flex:none}

@media(max-width:560px){
  .hero{grid-template-columns:1fr;text-align:center}.hero-owl{justify-self:center}.bubble::before{display:none}.hero-cta{justify-content:center}
  .unit-e{display:none}.unit-h{grid-template-columns:auto 1fr}
  .guide span{display:none}.cta-in{justify-content:center}.cta .btn{width:100%}
  .brand span{font-size:1.05rem}
  .top .chip{padding:.1rem .5rem;font-size:.82rem}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== plataforma: acessibilidade e componentes novos ===== */
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:8px;top:-60px;z-index:100;background:var(--ink);color:#fff;padding:.6rem 1rem;border-radius:8px;font-weight:800;text-decoration:none}
.skip:focus{top:8px}
#app:focus{outline:none}
a,button,summary,.opt,input{touch-action:manipulation}
button,.btn,.opt,.lrow{-webkit-tap-highlight-color:rgba(79,140,255,.25)}
h1,h2,h3{text-wrap:balance}
.stat b,.num,.rstats b,.chip{font-variant-numeric:tabular-nums}
.sheet,.dlg{overscroll-behavior:contain}
.ans:focus-visible,.welcome-card input:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.ans:focus:not(:focus-visible){outline:none}
.chip{border-radius:8px;display:inline-flex;align-items:center;gap:.3rem}
.chip.lnk{text-decoration:none;background:var(--blue-soft)}
.ic{flex:none}
.btn.sm{min-height:40px;padding:.4rem 1rem;font-size:.92rem}
.btn{transition:transform .08s,box-shadow .08s,background-color .12s}
.opt{transition:background-color .1s,border-color .1s}
.uprog i,.bar i{transition:width .5s}
.unit-test{display:flex;align-items:center;gap:.8rem;flex-wrap:wrap;padding:.7rem .3rem .4rem;border-top:2px dashed #d8def0}
.mtag{display:inline-block;margin-left:.5rem;padding:0 .5rem;border:2px solid var(--ink);border-radius:6px;font-size:.72rem;font-weight:900;vertical-align:middle;background:#fff}
.mtag.m1{background:#eee}.mtag.m2{background:var(--yel-soft)}.mtag.m3{background:#c9f0d8}.mtag.m4{background:var(--green);color:#fff}
.tabs{display:flex;gap:.5rem;justify-content:center;margin:1rem 0 .2rem}
.tab{min-height:44px;padding:.4rem 1.1rem;border:3px solid var(--ink);border-radius:10px;background:#fff;font-weight:800;cursor:pointer}
.tab[aria-pressed="true"]{background:var(--yel)}
#af{display:grid;gap:.35rem;text-align:left;margin-top:.8rem}
#af label{font-weight:800;margin-top:.5rem}
#af input{font:700 1.1rem var(--f-body);padding:.7rem 1rem;border:3px solid var(--ink);border-radius:12px;width:100%}
#af .btn{margin-top:1rem}
.formerr{margin:.4rem 0 0;min-height:1.4em;color:#c0204f;font-weight:800}
.dlg{border:3px solid var(--ink);border-radius:18px;padding:1.2rem 1.4rem;max-width:min(92vw,440px);background:var(--paper);color:var(--ink);box-shadow:7px 7px 0 var(--ink)}
.dlg::backdrop{background:rgba(35,39,92,.55)}
.dlg h2{font-family:var(--f-title);font-weight:400;font-size:1.4rem}
.dlg .actions{justify-content:flex-end;margin:1rem 0 0}
.tscroll{overflow-x:auto;margin:.8rem 0}
.tb .num{text-align:right}
.tb tr.weak td{background:var(--pink-soft)}
.tb a{color:var(--ink)}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
[hidden]{display:none!important}
.actions.l{justify-content:flex-start;margin:.8rem 0 0}
#af input{text-align:left}