/* BTBooks · btbooks.com.br
   Cores e fontes do manual da marca. Ferrogálica carrega o site; Folha é a página de leitura;
   a Romã aparece como a fita marcadora do logo, que marca a página atual e cada livro. */
:root{
  --tinta:#1E2430; --tinta-2:#262D3B; --tinta-3:#323A4A;
  --roma:#8E2234; --roma-viva:#B8384A; --roma-clara:#E9C3C9;
  --folha:#F5F5F2; --branco:#FFFFFF; --ferro:#5D6470; --nevoa:#DDE0E4; --nevoa-escura:#A9B0BA;
  --texto:#262B35; --texto-claro:#E6E8EC;
  --serif:"Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:"Source Sans 3", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --saida:cubic-bezier(.22,1,.36,1);          /* ease-out quint */
  --borda:min(6vw, 64px);
  --z-topo:30; --z-menu:40;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--tinta);-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--folha);color:var(--texto);font-family:var(--sans);font-size:1.125rem;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.1;margin:0;text-wrap:balance;letter-spacing:-.012em}
p{margin:0 0 1.1em;text-wrap:pretty}
.pular{position:absolute;left:12px;top:-60px;background:var(--branco);color:var(--tinta);padding:10px 16px;border-radius:8px;z-index:var(--z-menu);font-weight:600}
.pular:focus{top:12px}
:focus-visible{outline:3px solid var(--roma-viva);outline-offset:3px;border-radius:4px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ------------------------------------------------------------ topo */
.topo{position:sticky;top:0;z-index:var(--z-topo);background:color-mix(in oklab, var(--tinta) 94%, transparent);
  backdrop-filter:saturate(140%) blur(10px);-webkit-backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid rgba(255,255,255,.06)}
.topo .barra{max-width:1200px;margin:0 auto;height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 var(--borda);gap:16px}
.topo .marca img{height:31px;width:auto}
.topo nav ul{list-style:none;margin:0;padding:0;display:flex;gap:clamp(14px,3vw,34px)}
.topo nav a{position:relative;display:block;color:var(--texto-claro);text-decoration:none;font-weight:500;font-size:1.02rem;letter-spacing:.01em;padding:24px 2px}
.topo nav a:hover{color:var(--branco)}
/* a fita marcadora sobre o item atual: desce do alto da barra */
.topo nav a[aria-current="page"]{color:var(--branco)}
.topo nav a[aria-current="page"]::before{content:"";position:absolute;left:50%;top:0;width:10px;height:22px;margin-left:-5px;background:var(--roma-viva);
  clip-path:polygon(0 0,100% 0,100% 100%,50% 76%,0 100%);animation:fita-desce .9s var(--saida) both}
@keyframes fita-desce{from{clip-path:polygon(0 0,100% 0,100% 0,50% 0,0 0)}to{clip-path:polygon(0 0,100% 0,100% 100%,50% 76%,0 100%)}}

/* ------------------------------------------------------------ botões */
.botao{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border-radius:999px;
  font-family:var(--sans);font-weight:600;font-size:1.02rem;letter-spacing:.01em;text-decoration:none;cursor:pointer;border:1.5px solid transparent;
  transition:background-color .25s var(--saida), color .25s var(--saida), border-color .25s var(--saida), transform .25s var(--saida)}
.botao:active{transform:scale(.98)}
.botao-roma{background:var(--roma);color:var(--branco)}
.botao-roma:hover{background:var(--roma-viva)}
.botao-claro{border-color:rgba(255,255,255,.38);color:var(--branco)}
.botao-claro:hover{border-color:var(--branco);background:rgba(255,255,255,.06)}
.botao-tinta{background:var(--tinta);color:var(--branco)}
.botao-tinta:hover{background:var(--tinta-3)}
.botao svg{width:18px;height:18px;flex:none}
.em-breve{display:inline-flex;align-items:center;gap:10px;min-height:52px;padding:0 22px;border-radius:999px;border:1.5px dashed rgba(255,255,255,.4);color:var(--texto-claro);font-weight:600}
.em-breve .ponto{width:8px;height:8px;border-radius:50%;background:var(--roma-viva);box-shadow:0 0 0 4px rgba(184,56,74,.25)}
.estado{display:inline-flex;align-items:center;gap:8px;font-size:.92rem;font-weight:600;color:var(--ferro)}
.estado .ponto{width:7px;height:7px;border-radius:50%;background:var(--roma)}
.estado.disponivel .ponto{background:#2E7D4F}

/* ------------------------------------------------------------ o livro em 3D */
.livro3d{--w:240px;--esp:12;--t:calc(var(--w) * var(--esp) / 148);--h:calc(var(--w) * 1.4189);--giro:24deg;
  position:relative;width:var(--w);height:var(--h);perspective:1600px;flex:none}
.livro3d .corpo{position:absolute;inset:0;transform-style:preserve-3d;transform:rotateY(var(--giro)) rotateX(3deg);transition:transform 1s var(--saida)}
.livro3d .face{position:absolute;top:0;backface-visibility:hidden}
.livro3d .frente{left:0;width:var(--w);height:var(--h);transform:translateZ(calc(var(--t) / 2));border-radius:2px 4px 4px 2px;overflow:hidden;background:#ddd}
.livro3d .frente img{width:100%;height:100%;object-fit:cover}
/* luz: dobra da lombada e brilho suave da capa */
.livro3d .frente::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg, rgba(0,0,0,.28) 0, rgba(0,0,0,.06) 2.2%, rgba(255,255,255,.16) 3.4%, rgba(255,255,255,0) 9%),
             linear-gradient(115deg, rgba(255,255,255,.14), rgba(255,255,255,0) 38%, rgba(0,0,0,.08))}
.livro3d .lombada{left:calc(50% - var(--t) / 2);width:var(--t);height:var(--h);transform:rotateY(-90deg) translateZ(calc(var(--w) / 2));overflow:hidden}
.livro3d .lombada img{width:100%;height:100%;object-fit:cover;filter:brightness(.82)}
.livro3d .paginas{left:calc(50% - (var(--t) - 3px) / 2);top:3px;width:calc(var(--t) - 3px);height:calc(var(--h) - 6px);
  transform:rotateY(90deg) translateZ(calc(var(--w) / 2 - 3px));background:repeating-linear-gradient(90deg,#F7F4EC 0 1px,#E4DFD3 1px 2px)}
.livro3d .topo-paginas{left:0;top:0;width:calc(var(--w) - 3px);height:calc(var(--t) - 3px);
  transform:rotateX(90deg) translateZ(calc(var(--t) / 2 - 2px)) translateY(calc(-1 * (var(--t) - 3px) / 2));background:repeating-linear-gradient(0deg,#F7F4EC 0 1px,#E4DFD3 1px 2px)}
.livro3d .verso{left:0;width:var(--w);height:var(--h);transform:rotateY(180deg) translateZ(calc(var(--t) / 2));background:#1b1b1b}
/* sombra no chão */
.livro3d::after{content:"";position:absolute;left:4%;right:-14%;bottom:-7%;height:13%;background:radial-gradient(ellipse at 45% 40%, rgba(5,8,14,.55), rgba(5,8,14,0) 70%);
  filter:blur(4px);transform:translateZ(-1px);z-index:-1;transition:transform 1s var(--saida), opacity 1s var(--saida)}
a:hover > .livro3d .corpo, .livro3d.vivo:hover .corpo{transform:rotateY(12deg) rotateX(2deg) translateY(-6px)}
a:hover > .livro3d::after{transform:scaleX(.92);opacity:.85}
/* entrada: o livro assenta */
.livro3d.entra .corpo{animation:assenta 1.3s var(--saida) both}
@keyframes assenta{from{transform:rotateY(48deg) rotateX(8deg) translateY(-28px);opacity:0}to{opacity:1}}

/* ------------------------------------------------------------ abertura (início) */
.abertura{background:var(--tinta);color:var(--texto-claro);position:relative;overflow:hidden}
.abertura::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 70% at 78% 55%, rgba(80,96,128,.30), transparent 70%), radial-gradient(40% 40% at 10% 0%, rgba(142,34,52,.18), transparent 70%)}
.abertura .grade{position:relative;max-width:1200px;margin:0 auto;padding:clamp(56px,9vw,112px) var(--borda) clamp(72px,10vw,128px);
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:clamp(32px,5vw,72px);align-items:center}
.abertura h1{color:var(--branco);font-size:clamp(2.7rem,6.4vw,5.2rem);letter-spacing:-.022em;line-height:1.02}
.abertura h1 em{font-style:italic;font-weight:400;color:var(--roma-clara)}
.abertura .lead{font-size:clamp(1.12rem,1.9vw,1.32rem);line-height:1.6;color:#C9CED7;max-width:38ch;margin:26px 0 34px}
.abertura .acoes{display:flex;flex-wrap:wrap;gap:12px}
.cena{position:relative;container-type:inline-size;width:100%;aspect-ratio:100/92}
.cena .livro3d{position:absolute}
.cena .l1{--w:40cqw;left:0;top:0;--giro:28deg;z-index:1;filter:brightness(.84)}
.cena .l2{--w:43cqw;left:30cqw;top:10cqw;--giro:25deg;z-index:2;filter:brightness(.93)}
.cena .l3{--w:46cqw;left:55cqw;top:21cqw;--giro:22deg;z-index:3}

/* ------------------------------------------------------------ seções */
.secao{padding:clamp(72px,11vw,140px) var(--borda)}
.secao .conteudo{max-width:1200px;margin:0 auto}
.estreito{max-width:68ch}
.titulo-secao{font-size:clamp(2.05rem,4.4vw,3.35rem);margin-bottom:22px;color:var(--tinta)}
.sub{font-size:1.2rem;color:var(--ferro);max-width:52ch}

/* estante */
.estante{background:var(--folha)}
.estante .cabeca{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:18px;margin-bottom:clamp(40px,6vw,72px)}
.prateleira{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:clamp(48px,6vw,72px) clamp(28px,4vw,56px)}
.prateleira > li{display:flex}
.cartao-livro{display:flex;flex-direction:column;align-items:flex-start;text-decoration:none;color:inherit;width:100%;container-type:inline-size}
.cartao-livro .livro3d{--w:min(196px, 74cqw);margin:0 0 34px 18px}
.cartao-livro .estado{margin-top:auto}
.cartao-livro h3{font-size:1.45rem;color:var(--tinta);margin-bottom:6px}
.cartao-livro .por{color:var(--ferro);font-size:1rem;margin:0 0 12px}
.cartao-livro .ver{margin-top:auto;font-weight:600;color:var(--roma);display:inline-flex;align-items:center;gap:8px}
.cartao-livro .ver svg{width:16px;height:16px;transition:transform .3s var(--saida)}
.cartao-livro:hover .ver svg{transform:translateX(4px)}
.cartao-livro:hover h3{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:5px}
.base{height:1px;background:linear-gradient(90deg,transparent,var(--nevoa) 12%,var(--nevoa) 88%,transparent);margin-top:clamp(40px,6vw,64px)}

/* autores */
.autores{background:var(--branco)}
.autores .duas{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(32px,6vw,96px);align-items:start}
.caminho{list-style:none;margin:clamp(40px,6vw,64px) 0 0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;counter-reset:etapa;position:relative}
.caminho::before{content:"";position:absolute;left:0;right:0;top:22px;height:2px;background:var(--nevoa)}
.caminho li{position:relative;padding:0 14px 0 0;counter-increment:etapa}
.caminho li::before{content:counter(etapa);display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:var(--branco);border:2px solid var(--tinta);
  font-family:var(--serif);font-weight:600;font-size:1.15rem;color:var(--tinta);position:relative;margin-bottom:18px}
.caminho li:last-child::before{background:var(--roma);border-color:var(--roma);color:var(--branco)}
.caminho h3{font-family:var(--sans);font-size:1.05rem;font-weight:600;color:var(--tinta);line-height:1.3;margin-bottom:6px}
.caminho p{font-size:.98rem;color:var(--ferro);margin:0}
.frase{font-family:var(--serif);font-size:clamp(1.7rem,3.6vw,2.6rem);line-height:1.22;color:var(--tinta);margin:clamp(56px,8vw,96px) 0 0;max-width:24ch}
.frase em{font-style:italic;color:var(--roma)}

/* boa terra */
.terra{background:var(--tinta);color:var(--texto-claro);position:relative;overflow:hidden}
.terra .titulo-secao{color:var(--branco)}
.terra .duas{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:clamp(32px,6vw,88px);align-items:center}
.terra blockquote{margin:30px 0 32px;font-family:var(--serif);font-style:italic;font-size:clamp(1.25rem,2.4vw,1.55rem);line-height:1.5;color:var(--branco)}
.terra blockquote footer{font-family:var(--sans);font-style:normal;font-size:.95rem;font-weight:600;letter-spacing:.04em;color:var(--roma-clara);margin-top:12px}
.terra p{line-height:1.75;color:#C9CED7}
.terra figure{margin:0;position:relative}
.terra figure img{width:100%;aspect-ratio:896/1152;object-fit:cover;border-radius:6px}
.colheita{position:absolute;left:0;top:0;display:flex;flex-direction:column;gap:.08em;padding:clamp(28px,4vw,44px);font-family:var(--serif);font-style:italic;line-height:.95;color:var(--branco);text-shadow:0 2px 18px rgba(10,14,22,.55)}
.colheita span{display:block;white-space:nowrap}
.colheita .c1{font-size:clamp(3rem,6vw,4.6rem)}
.colheita .c2{font-size:clamp(2rem,4vw,3rem);color:#D5D9E0}
.colheita .c3{font-size:clamp(1.4rem,2.6vw,1.9rem);color:var(--roma-clara)}
.terra figure::before{content:"";position:absolute;right:28px;top:-1px;width:14px;height:110px;background:var(--roma-viva);clip-path:polygon(0 0,100% 0,100% 100%,50% 84%,0 100%);z-index:1}

/* fecho */
.fecho{background:var(--folha);text-align:center}
.fecho .simbolo{width:58px;height:auto;margin:0 auto 26px}
.fecho h2{font-size:clamp(1.9rem,4vw,3rem);max-width:22ch;margin:0 auto 18px;color:var(--tinta)}
.fecho p{color:var(--ferro);font-size:1.2rem}
.fecho .acoes{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:30px}
.contato{font-size:1rem;color:var(--ferro);margin-top:18px}
.contato a{color:var(--roma);font-weight:600}

/* ------------------------------------------------------------ loja */
.cabeca-pagina{background:var(--tinta);color:var(--texto-claro);padding:clamp(56px,8vw,96px) var(--borda) clamp(48px,7vw,80px)}
.cabeca-pagina .conteudo{max-width:1200px;margin:0 auto}
.cabeca-pagina h1{color:var(--branco);font-size:clamp(2.6rem,6vw,4.4rem);letter-spacing:-.02em;margin-bottom:16px}
.cabeca-pagina p{color:#C9CED7;font-size:1.2rem;max-width:52ch;margin:0}
.loja .prateleira{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.loja .cartao-livro .livro3d{--w:min(220px, 78cqw)}
.loja .cartao-livro .resumo{color:var(--texto);font-size:1rem;margin:0 0 14px;max-width:36ch}

/* ------------------------------------------------------------ página do livro */
.livro-topo{background:var(--tinta);color:var(--texto-claro);position:relative;overflow:hidden}
.livro-topo::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(50% 70% at 28% 55%, rgba(80,96,128,.32), transparent 70%)}
.livro-topo .grade{position:relative;max-width:1200px;margin:0 auto;padding:clamp(48px,8vw,104px) var(--borda) clamp(64px,9vw,120px);
  display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(40px,7vw,96px);align-items:center}
.livro-topo .palco{display:grid;place-items:center;min-height:clamp(380px,46vw,560px)}
.livro-topo .livro3d{--w:clamp(220px,25vw,330px)}
.migalha{font-size:.95rem;color:var(--nevoa-escura);margin:0 0 22px}
.migalha a{color:var(--nevoa-escura);text-decoration:none}
.migalha a:hover{color:var(--branco);text-decoration:underline}
.livro-topo h1{color:var(--branco);font-size:clamp(2.5rem,5.4vw,4.2rem);letter-spacing:-.02em;margin-bottom:16px}
.livro-topo .subtitulo{font-family:var(--serif);font-style:italic;font-size:clamp(1.2rem,2.2vw,1.45rem);line-height:1.45;color:#D3D7DE;margin:0 0 22px;max-width:34ch}
.livro-topo .autor{font-weight:600;letter-spacing:.02em;color:var(--branco);margin:0 0 32px}
.livro-topo .autor span{color:var(--nevoa-escura);font-weight:400}
.compra{display:flex;flex-wrap:wrap;align-items:center;gap:14px 18px}
.compra .aviso{font-size:.95rem;color:var(--nevoa-escura);margin:0;max-width:34ch}
.ficha{display:flex;flex-wrap:wrap;gap:12px 32px;margin:34px 0 0;padding:22px 0 0;border-top:1px solid rgba(255,255,255,.12)}
.ficha div{min-width:120px}
.ficha dt{font-size:.85rem;color:var(--nevoa-escura);margin:0 0 2px}
.ficha dd{margin:0;color:var(--branco);font-weight:600;font-variant-numeric:tabular-nums}

.sobre-livro .duas{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:clamp(40px,7vw,104px);align-items:start}
.sobre-livro .texto .chamada{font-family:var(--serif);font-size:clamp(1.8rem,3.8vw,2.7rem);line-height:1.18;color:var(--tinta);margin:0 0 28px}
.sobre-livro .texto p{font-size:1.15rem;line-height:1.78}
.versiculo{margin:34px 0 0;padding:26px 28px;background:var(--branco);border-radius:10px}
.versiculo p{font-family:var(--serif);font-style:italic;font-size:1.3rem;line-height:1.5;color:var(--tinta);margin:0 0 10px}
.versiculo cite{font-style:normal;font-weight:600;font-size:.95rem;color:var(--roma)}
.indice{background:var(--branco);border-radius:14px;padding:clamp(26px,3.6vw,40px)}
.indice h2{font-size:1.6rem;color:var(--tinta);margin-bottom:20px}
.indice ol{list-style:none;margin:0;padding:0;counter-reset:item}
.indice li{counter-increment:item;display:grid;grid-template-columns:2.4em 1fr;gap:6px;padding:10px 0;border-top:1px solid var(--nevoa);font-size:1.02rem;line-height:1.4}
.indice li:first-child{border-top:0}
.indice li::before{content:counter(item, decimal-leading-zero);font-family:var(--serif);font-weight:600;color:var(--roma);font-variant-numeric:tabular-nums}
.indice .fecho-lista{margin:18px 0 0;font-family:var(--serif);font-style:italic;color:var(--ferro)}

.autor-bloco{background:var(--branco)}
.autor-bloco .duas{display:grid;grid-template-columns:minmax(160px,260px) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:center;max-width:980px}
.autor-bloco img{width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;border-radius:8px;filter:grayscale(.15)}
.autor-bloco h2{font-size:clamp(1.9rem,3.6vw,2.6rem);color:var(--tinta);margin:0 0 18px}
.autor-bloco p{font-size:1.12rem;line-height:1.75}
.autor-bloco.sem-foto .duas{grid-template-columns:1fr;max-width:72ch}

.outros{background:var(--folha)}

/* ------------------------------------------------------------ rodapé */
.rodape{background:var(--tinta);color:var(--nevoa-escura);padding:56px var(--borda) 40px;font-size:.98rem}
.rodape .conteudo{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.2fr 1fr;gap:32px 48px}
.rodape img{height:34px;width:auto;margin-bottom:16px}
.rodape p{max-width:48ch;margin:0 0 8px}
.rodape nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:flex-end}
.rodape nav a{color:var(--texto-claro);text-decoration:none}
.rodape nav a:hover{color:var(--branco);text-decoration:underline}
.rodape .legal{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.08);padding-top:22px;font-size:.9rem}

/* ------------------------------------------------------------ revelação suave (o conteúdo já nasce visível; o JS só anima) */
.anima .revela{opacity:0;transform:translateY(18px)}
.anima .revela.visto{opacity:1;transform:none;transition:opacity .9s var(--saida), transform .9s var(--saida)}

/* ------------------------------------------------------------ telas menores */
@media (max-width: 960px){
  .abertura .grade,.livro-topo .grade,.sobre-livro .duas,.terra .duas,.autores .duas{grid-template-columns:1fr}
  .cena{max-width:520px;margin:0 auto}
  .livro-topo .palco{min-height:auto;padding-top:8px}
  .caminho{grid-template-columns:1fr;gap:26px}
  .caminho::before{left:22px;right:auto;top:0;bottom:0;width:2px;height:auto}
  .caminho li{display:grid;grid-template-columns:46px 1fr;column-gap:18px;padding:0}
  .caminho li::before{margin:0;grid-row:span 2}
  .terra figure{max-width:440px}
}
@media (max-width: 640px){
  body{font-size:1.0625rem}
  .topo .barra{height:64px}
  .topo .marca img{height:24px}
  .topo nav a{font-size:.98rem;padding:21px 0}
  .topo nav ul{gap:16px}
  .abertura .acoes .botao,.fecho .acoes .botao{width:100%}
  .rodape .conteudo{grid-template-columns:1fr}
  .rodape nav ul{justify-content:flex-start}
  .autor-bloco .duas{grid-template-columns:1fr}
  .autor-bloco img{max-width:220px}
  .cartao-livro .livro3d{margin-left:12px}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .anima .revela{opacity:1;transform:none}
}