*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--creme); color: var(--tinta); font-family: var(--fonte-texto); font-size: 18px; line-height: 1.6; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--marrom); outline-offset: 3px; border-radius: 6px; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
h1, h2, h3 { font-family: var(--fonte-titulo); font-weight: 400; text-transform: uppercase; line-height: 1.04; letter-spacing: .3px; margin: 0; }
h2 { font-size: clamp(36px, 4.6vw, 58px); margin-bottom: 16px; }
.destaque { background: linear-gradient(transparent 60%, var(--amarelo) 60%); padding: 0 .12em; }
.kicker { display: inline-block; font-weight: 900; letter-spacing: 3px; text-transform: uppercase; font-size: 14px; color: var(--marrom); }
.lead { font-size: 20px; color: var(--cinza); max-width: 620px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Botão de compra */
.cta { display: inline-flex; align-items: center; justify-content: center; gap: 10px; background: var(--amarelo); color: var(--tinta);
  font-weight: 900; font-size: 19px; text-decoration: none; padding: 18px 32px; border: var(--borda); border-radius: 16px;
  box-shadow: var(--sombra); transition: transform .12s, box-shadow .12s; cursor: pointer; text-align: center; }
.cta:hover { transform: translateY(3px); box-shadow: 0 4px 0 var(--tinta); }
.cta:active { transform: translateY(7px); box-shadow: 0 1px 0 var(--tinta); }
.cta .seta { transition: transform .2s; }
.cta:hover .seta { transform: translateX(4px); }
.cta--grande { font-size: 22px; padding: 22px 40px; }
.cta--mini { font-size: 16px; padding: 10px 20px; box-shadow: 0 4px 0 var(--tinta); }
.cta--claro { background: transparent; box-shadow: none; }
.cta--claro:hover { background: var(--branco); box-shadow: none; transform: none; }

.confianca { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 22px; font-size: 15px; font-weight: 800; color: var(--cinza); list-style: none; padding: 0; }
.confianca li::before { content: "✓ "; color: var(--verde); font-weight: 900; }

/* Livro em 3D a partir da capa verdadeira */
.livro3d { perspective: 1400px; --rx: 0deg; --ry: 0deg; }
.livro3d__corpo { position: relative; transform-style: preserve-3d; transform: rotateX(var(--rx)) rotateY(calc(-24deg + var(--ry))); transition: transform .35s ease-out; }
.livro3d__capa { position: relative; width: 100%; border-radius: 3px 8px 8px 3px; box-shadow: inset 4px 0 6px rgba(0,0,0,.25); z-index: 2; }
.livro3d__corpo::before { content: ""; position: absolute; top: 2%; bottom: 2%; right: -14px; width: 16px; background: repeating-linear-gradient(#fff 0 2px, #e9e3d8 2px 3px);
  transform: rotateY(90deg); transform-origin: left; }
.livro3d__corpo::after { content: ""; position: absolute; left: 6%; right: -6%; bottom: -26px; height: 30px; background: radial-gradient(closest-side, rgba(0,0,0,.35), transparent); filter: blur(4px); z-index: 0; }

/* Revelação na rolagem (a classe .js-reveal é posta pelo JS, então sem JS tudo aparece) */
.js-reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.js-reveal.is-visivel { opacity: 1; transform: none; }

section { padding: 100px 0; }
.cabeca { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.cabeca .lead { margin: 0 auto; }

@media (max-width: 900px) {
  body { font-size: 17px; }
  .wrap { padding: 0 20px; }
  section { padding: 70px 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}