/* ============================================================
   Biblioteca Neuren — motor de leitura
   Compartilhado por todas as apostilas. Conteúdo vem de dados.js
   ============================================================ */
:root{
  --sage:#5D7D4B; --sage-esc:#3F5732; --sage-cl:#DCE6D2; --sage-mid:#9BB388;
  --tinta:#1F2419; --suave:#6E7464; --areia:#F1F5EE;
  --papel:#fff; --borda:#E4E8DE; --amb:#E3E9DD;
  --terra:#A4553C; --terra-cl:#FBF2EE;
  --serif:'Fraunces',Georgia,serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --fs:18px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--amb);color:var(--tinta);
  font-family:var(--sans);font-size:var(--fs);line-height:1.72;
  -webkit-font-smoothing:antialiased;overflow:hidden;
  background-image:radial-gradient(ellipse at 50% 0%,#EDF1E8,var(--amb) 70%);
}

/* ─────────── barra superior ─────────── */
.topo{
  position:fixed;inset:0 0 auto 0;z-index:60;height:56px;
  background:rgba(255,255,255,.93);backdrop-filter:blur(12px) saturate(180%);
  border-bottom:1px solid var(--borda);display:flex;align-items:center;gap:.9rem;padding:0 1rem;
}
.topo .volta{
  display:inline-flex;align-items:center;gap:.4rem;text-decoration:none;
  color:var(--suave);font-size:.82rem;font-weight:500;padding:.4rem .6rem;border-radius:8px;
  white-space:nowrap;
}
.topo .volta:hover{background:var(--areia);color:var(--sage-esc)}
.tit{flex:1;min-width:0}
.tit strong{display:block;font-family:var(--serif);font-size:.95rem;font-weight:600;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.25}
.tit span{font-size:.72rem;color:var(--suave)}
.acoes{display:flex;gap:.28rem;align-items:center}
.acoes button{
  font:inherit;font-size:.78rem;cursor:pointer;background:var(--papel);
  border:1px solid var(--borda);color:var(--suave);height:33px;min-width:33px;
  padding:0 .55rem;border-radius:8px;line-height:1;transition:border-color .15s,color .15s;
}
.acoes button:hover{border-color:var(--sage);color:var(--sage-esc)}
.acoes button[aria-pressed=true]{background:var(--sage-cl);border-color:var(--sage);color:var(--sage-esc)}

/* ─────────── palco / livro ─────────── */
.palco{position:fixed;inset:56px 0 60px 0;display:grid;place-items:center;
  padding:clamp(.4rem,2vw,1.5rem)}
.livro{
  position:relative;width:100%;max-width:840px;height:100%;
  perspective:2600px;perspective-origin:50% 45%;
}
/* pilha de páginas visível nas bordas */
.livro::before,.livro::after{
  content:'';position:absolute;top:6px;bottom:6px;width:5px;border-radius:2px;
  background:linear-gradient(90deg,#fff,#E7EBE1);pointer-events:none;z-index:0;
}
.livro::before{right:-5px;box-shadow:3px 0 0 -1px #F4F6F1,6px 0 0 -2px #EAEEE5}
.livro::after{left:-5px;background:linear-gradient(270deg,#fff,#E7EBE1);
  box-shadow:-3px 0 0 -1px #F4F6F1,-6px 0 0 -2px #EAEEE5}

.pg{
  position:absolute;inset:0;background:var(--papel);
  border:1px solid var(--borda);border-radius:2px 6px 6px 2px;
  box-shadow:0 1px 2px rgba(31,36,25,.05),0 6px 22px rgba(31,36,25,.09);
  overflow-y:auto;overscroll-behavior:contain;
  padding:clamp(1.4rem,4.5vw,3.6rem);
  transform-origin:left center;transform-style:preserve-3d;
  will-change:transform;
  transition:transform var(--dur,.78s) cubic-bezier(.62,.02,.30,1),
             box-shadow var(--dur,.78s) ease;
}
/* vinco da lombada */
.pg .lombada{
  position:absolute;inset:0 auto 0 0;width:26px;pointer-events:none;z-index:3;
  background:linear-gradient(90deg,rgba(31,36,25,.10),rgba(31,36,25,.03) 40%,transparent);
}
/* sombra que varre a página durante a virada */
.pg .sombra{
  position:absolute;inset:0;pointer-events:none;z-index:4;opacity:0;
  background:linear-gradient(95deg,rgba(31,36,25,.34),rgba(31,36,25,.05) 48%,transparent 72%);
  transition:opacity calc(var(--dur,.78s)*.5) ease;
}
.pg.ativa{transform:rotateY(0deg);z-index:2}
.pg.futura{transform:rotateY(0deg);z-index:1;visibility:hidden}
.pg.oculta{transform:rotateY(-179deg);z-index:1;visibility:hidden}
/* durante a virada: página visível, sombra acesa, elevação maior */
.pg.virando{
  visibility:visible;z-index:5;
  box-shadow:0 1px 2px rgba(31,36,25,.06),22px 12px 46px rgba(31,36,25,.26);
}
.pg.virando .sombra{opacity:1}
/* voltando (virada inversa) */
.pg.voltando{visibility:visible;z-index:5}
.pg.voltando .sombra{opacity:1}

body.sem-anim .pg{transition:opacity .16s ease;transform:none!important}
body.sem-anim .pg.oculta,body.sem-anim .pg.futura{opacity:0;visibility:hidden}
body.sem-anim .pg.ativa{opacity:1;visibility:visible}
body.sem-anim .pg .sombra{display:none}

.folha-in{max-width:64ch;margin:0 auto}

/* ─────────── navegação ─────────── */
.trilho{position:fixed;left:0;right:0;bottom:60px;height:2px;background:var(--sage-cl);z-index:61}
.trilho i{display:block;height:100%;background:var(--sage);width:0;
  transition:width .4s cubic-bezier(.4,0,.2,1)}
.nav{
  position:fixed;inset:auto 0 0 0;height:60px;z-index:60;
  background:rgba(255,255,255,.93);backdrop-filter:blur(12px);
  border-top:1px solid var(--borda);display:flex;align-items:center;
  justify-content:center;gap:.75rem;padding:0 1rem;
}
.nav button{
  font:inherit;font-size:.83rem;font-weight:500;cursor:pointer;
  background:var(--papel);border:1px solid var(--borda);color:var(--tinta);
  padding:.52rem 1rem;border-radius:9px;display:inline-flex;align-items:center;gap:.4rem;
  transition:border-color .15s,color .15s;
}
.nav button:hover:not(:disabled){border-color:var(--sage);color:var(--sage-esc)}
.nav button:disabled{opacity:.32;cursor:default}
.conta-pg{font-size:.78rem;color:var(--suave);font-variant-numeric:tabular-nums;
  min-width:110px;text-align:center}

/* ─────────── sumário ─────────── */
.sumario{
  position:fixed;inset:56px 0 60px 0;z-index:58;background:rgba(241,245,238,.975);
  backdrop-filter:blur(8px);overflow-y:auto;padding:2rem 1.25rem 3rem;
  display:none;animation:sobe .22s ease;
}
@keyframes sobe{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.sumario.aberto{display:block}
.sumario-in{max-width:660px;margin:0 auto}
.sumario h2{font-family:var(--serif);font-size:1.45rem;margin:0 0 1.4rem}
.sum-cap{font-size:.66rem;letter-spacing:.13em;text-transform:uppercase;color:var(--sage);
  font-weight:600;margin:1.7rem 0 .55rem}
.sumario button{
  display:flex;align-items:center;gap:.85rem;width:100%;text-align:left;font:inherit;
  cursor:pointer;background:var(--papel);border:1px solid var(--borda);border-radius:9px;
  padding:.7rem .95rem;margin-bottom:.42rem;color:inherit;transition:border-color .15s;
}
.sumario button:hover{border-color:var(--sage)}
.sumario button .pgn{
  flex:none;width:26px;height:26px;border-radius:6px;background:var(--areia);
  color:var(--suave);font-size:.72rem;font-weight:600;display:grid;place-items:center;
  font-variant-numeric:tabular-nums;
}
.sumario button b{display:block;font-weight:600;font-size:.92rem;line-height:1.3}
.sumario button.atual{border-color:var(--sage);background:var(--sage-cl)}
.sumario button.atual .pgn{background:var(--sage);color:#fff}
.sumario button.lido .pgn{background:var(--sage-cl);color:var(--sage-esc)}

/* ─────────── capa ─────────── */
.capa{height:100%;display:flex;flex-direction:column;justify-content:center;
  text-align:center;padding:1rem 0}
.capa .marca{display:inline-flex;align-items:center;gap:.55rem;justify-content:center;margin-bottom:2.2rem}
.capa .marca img{width:38px;height:38px}
.capa .marca span{font-family:var(--serif);font-size:1.25rem;font-weight:600;color:var(--sage-esc)}
.eyebrow{font-size:.69rem;letter-spacing:.16em;text-transform:uppercase;color:var(--sage);
  font-weight:600;margin-bottom:.9rem}
.capa h1{font-family:var(--serif);font-size:clamp(2rem,5.8vw,3.3rem);font-weight:600;
  line-height:1.08;letter-spacing:-.022em;margin:0 0 .5rem}
.capa .sub{font-size:1.04rem;color:var(--suave);margin:0 auto 2.2rem;max-width:40ch}
.capa-arte{margin:0 auto 2.2rem;max-width:360px}
.ficha{display:flex;flex-wrap:wrap;justify-content:center;border-top:1px solid var(--borda);padding-top:1.35rem}
.ficha div{padding:0 1.2rem;border-left:1px solid var(--borda)}
.ficha div:first-child{border-left:0}
.ficha dt{font-size:.63rem;text-transform:uppercase;letter-spacing:.1em;color:var(--suave);
  font-weight:600;margin-bottom:.22rem}
.ficha dd{margin:0;font-size:.85rem;font-weight:500}

/* ─────────── tipografia ─────────── */
.cap-tag{font-size:.67rem;letter-spacing:.13em;text-transform:uppercase;color:var(--sage);
  font-weight:600;margin-bottom:.5rem}
h2.h{font-family:var(--serif);font-size:clamp(1.45rem,3.5vw,1.95rem);font-weight:600;
  line-height:1.18;letter-spacing:-.018em;margin:0 0 1rem}
h3{font-family:var(--serif);font-size:1.13rem;font-weight:600;margin:1.85rem 0 .55rem}
h4{font-family:var(--sans);font-size:.95rem;font-weight:600;margin:1.3rem 0 .45rem}
p{margin:0 0 1rem}
ul,ol{margin:0 0 1rem;padding-left:1.3rem}
li{margin-bottom:.42rem}
strong{font-weight:600}
mark{background:var(--sage-cl);color:var(--sage-esc);padding:.05em .25em;border-radius:3px}

.box{background:var(--areia);border-left:3px solid var(--sage);padding:.95rem 1.2rem;
  margin:1.4rem 0;border-radius:0 6px 6px 0}
.box p:last-child{margin-bottom:0}
.box .rot{display:block;font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--sage-esc);margin-bottom:.3rem;font-weight:600}
.box.alerta{border-left-color:var(--terra);background:var(--terra-cl)}
.box.alerta .rot{color:var(--terra)}

.conta{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.88rem;
  background:var(--areia);border:1px solid var(--borda);border-radius:6px;
  padding:.85rem 1.05rem;margin:1.1rem 0;line-height:1.8;overflow-x:auto;white-space:pre}
.conta b{color:var(--sage-esc);font-weight:600}

figure{margin:1.5rem 0}
svg{display:block;width:100%;height:auto;max-width:100%}
figcaption{font-size:.77rem;color:var(--suave);margin-top:.55rem;text-align:center}

table{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:.87rem}
th,td{padding:.52rem .68rem;border-bottom:1px solid var(--borda);text-align:left;vertical-align:top}
th{font-size:.65rem;text-transform:uppercase;letter-spacing:.08em;color:var(--suave);
  font-weight:600;border-bottom-color:var(--sage-cl)}
td.n{font-variant-numeric:tabular-nums;text-align:center}
.tab-rolo{overflow-x:auto;margin:1.2rem 0}
.tab-rolo table{margin:0;min-width:420px}

/* linha do tempo (usada em História/Ciências) */
.linha{position:relative;padding-left:1.6rem;margin:1.4rem 0}
.linha::before{content:'';position:absolute;left:5px;top:.4rem;bottom:.4rem;width:2px;background:var(--sage-cl)}
.linha .ev{position:relative;margin-bottom:1.1rem}
.linha .ev::before{content:'';position:absolute;left:-1.6rem;top:.45rem;width:12px;height:12px;
  border-radius:50%;background:var(--papel);border:2px solid var(--sage)}
.linha .ev b{display:block;font-size:.78rem;color:var(--sage-esc);font-weight:600;
  letter-spacing:.02em;margin-bottom:.1rem}
.linha .ev p{margin:0;font-size:.93rem}

/* exemplo resolvido */
.resolvido{border:1px solid var(--borda);border-radius:9px;margin:1.6rem 0;overflow:hidden}
.resolvido-cab{background:var(--areia);padding:.75rem 1.15rem;border-bottom:1px solid var(--borda);
  font-size:.68rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--sage-esc)}
.resolvido-corpo{padding:1.2rem}
.resolvido-corpo>:last-child{margin-bottom:0}
.passo{display:flex;gap:.8rem;margin-bottom:.95rem;align-items:flex-start}
.passo:last-child{margin-bottom:0}
.passo-n{flex:none;width:23px;height:23px;border-radius:50%;background:var(--sage-cl);
  color:var(--sage-esc);font-size:.73rem;font-weight:600;display:grid;place-items:center;margin-top:.12rem}
.passo-t{flex:1;min-width:0}
.passo-t>:last-child{margin-bottom:0}

/* erros comuns */
.erro{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--borda);
  border:1px solid var(--borda);border-radius:8px;overflow:hidden;margin:1.4rem 0}
.erro>div{background:var(--papel);padding:.95rem 1.1rem}
.erro h4{margin:0 0 .4rem;font-size:.67rem;letter-spacing:.09em;text-transform:uppercase;font-weight:600}
.erro .x h4{color:var(--terra)}
.erro .v h4{color:var(--sage-esc)}
.erro p{margin:0;font-size:.88rem;line-height:1.6}
.erro .pq{margin-top:.5rem;color:var(--suave);font-style:italic}
@media(max-width:600px){.erro{grid-template-columns:1fr}}

/* questões */
.q{border:1px solid var(--sage-cl);border-radius:9px;padding:1.1rem 1.25rem;margin:1.1rem 0;background:#FCFDFB}
.q-cab{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:.65rem}
.q-num{font-size:.67rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--sage)}
.q-nivel{font-size:.65rem;color:var(--suave);border:1px solid var(--borda);padding:.1rem .45rem;border-radius:100px}
.q>p{margin-bottom:.8rem}
.alts{list-style:none;padding:0;margin:0 0 .45rem;counter-reset:a}
.alts li{counter-increment:a;margin-bottom:.33rem}
.alts button{
  width:100%;text-align:left;font:inherit;font-size:.89rem;cursor:pointer;
  background:var(--papel);border:1px solid var(--borda);border-radius:7px;
  padding:.52rem .78rem;display:flex;gap:.58rem;align-items:flex-start;color:inherit;
  transition:border-color .15s,background .15s;
}
.alts button::before{
  content:counter(a,upper-alpha);flex:none;width:20px;height:20px;border-radius:50%;
  background:var(--areia);color:var(--suave);font-size:.69rem;font-weight:600;
  display:grid;place-items:center;margin-top:.08rem;transition:background .15s,color .15s;
}
.alts button:hover:not(.ok):not(.no){border-color:var(--sage)}
.alts button.ok{border-color:var(--sage);background:var(--sage-cl)}
.alts button.ok::before{background:var(--sage);color:#fff;content:'✓'}
.alts button.no{border-color:#D9B3A5;background:var(--terra-cl)}
.alts button.no::before{background:var(--terra);color:#fff;content:'✕'}
.fb{display:none;font-size:.87rem;border-top:1px solid var(--sage-cl);padding-top:.7rem;
  margin-top:.3rem;line-height:1.6}
.fb.on{display:block;animation:sobe .2s ease}
.fb b{color:var(--sage-esc)}

/* desafio */
.desafio{background:var(--sage-esc);color:#EEF2E9;border-radius:10px;padding:1.5rem 1.65rem;margin:1.5rem 0}
.desafio .selo{display:inline-block;font-size:.64rem;letter-spacing:.11em;text-transform:uppercase;
  background:rgba(255,255,255,.14);color:#DCE6D2;padding:.24rem .6rem;border-radius:100px;
  font-weight:600;margin-bottom:.8rem}
.desafio h3{color:#fff;margin-top:0}
.desafio p{color:#DCE6D2}
.desafio .conta{background:rgba(0,0,0,.22);border-color:rgba(255,255,255,.14);color:#EEF2E9}
.desafio .conta b{color:#C3D6B0}
.desafio details{border-top:1px solid rgba(255,255,255,.18);padding-top:.8rem;margin-top:1rem}
.desafio summary{cursor:pointer;font-size:.85rem;font-weight:600;color:#fff;list-style:none}
.desafio summary::-webkit-details-marker{display:none}
.desafio summary::before{content:'▸ ';display:inline-block;transition:transform .15s}
.desafio details[open] summary::before{transform:rotate(90deg)}
.desafio .fonte{font-size:.74rem;opacity:.7;margin:.85rem 0 0}

.fim{text-align:center;padding:1.75rem 0}
.fim .marca-f{display:inline-flex;align-items:center;gap:.5rem;margin-bottom:1.1rem}
.fim .marca-f img{width:26px;height:26px;opacity:.7}
.rodape-nota{font-size:.75rem;color:var(--suave);border-top:1px solid var(--borda);
  padding-top:1rem;margin-top:1.6rem}
.rodape-nota ul{padding-left:1.1rem}

@media(prefers-reduced-motion:reduce){
  .pg{transition:opacity .16s!important;transform:none!important}
  .pg .sombra{display:none}
}
@media print{
  body{overflow:visible;background:#fff}
  .topo,.nav,.trilho,.sumario{display:none}
  .palco{position:static;inset:auto;display:block;padding:0}
  .livro{max-width:100%;height:auto;perspective:none}
  .livro::before,.livro::after{display:none}
  .pg{position:static;transform:none!important;visibility:visible!important;
    box-shadow:none;border:0;border-bottom:1px solid #ddd;page-break-after:always;
    height:auto;overflow:visible;padding:0 0 1.5rem}
  .pg .lombada,.pg .sombra{display:none}
  .desafio{background:#fff;color:#000;border:1px solid #999}
  .desafio h3,.desafio p{color:#000}
  details{display:block}
  details>summary{display:none}
}

/* ─────────────────────────────────────────────────────────────
   Correção: no celular o subtítulo do cabeçalho (.tit span) não
   tinha truncamento — só o .tit strong tinha. Com .tit comprimido
   a ~67px pelo flex, o span quebrava em 3 linhas (107px de altura)
   e vazava do header de 56px por cima do conteúdo da página.
   Solução: truncar o span como já se fazia com o strong, esconder
   o subtítulo em telas estreitas (onde 67px não mostra nada útil)
   e dar overflow:hidden no header como rede de segurança.
   ───────────────────────────────────────────────────────────── */
.topo{overflow:hidden}
.tit span{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.25}
@media(max-width:560px){
  .topo{gap:.5rem;padding:0 .6rem}
  .topo .volta{padding:.35rem .4rem;font-size:.78rem}
  .tit span{display:none}
  .acoes{gap:.2rem}
  .acoes button{padding:0 .42rem;min-width:30px;height:30px;font-size:.74rem}
}