/* =========================
   RESET
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* =========================
   PALETA GOLDEN AGE
========================= */
:root {
  --paper-light: #f6f1e7;
  --paper-dark: #e6dccb;
  --ink-main: #2b1f14;
  --ink-soft: #5a4a3a;
  --brown-dark: #3b2a1a;
  --brown-medium: #6b4e2e;
  --gold-muted: #b89b5e;
}

/* =========================
   BASE
========================= */
body {
  font-family: "Georgia", "Times New Roman", serif;
  background: var(--paper-light);
  color: var(--ink-main);
  line-height: 1.75;
  letter-spacing: 0.2px;
}

/* =========================
   LINKS
========================= */
a {
  color: var(--ink-main);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-muted);
}

a:hover {
  color: var(--brown-medium);
}

/* =========================
   BOTÕES – IMPRESSO ANTIGO
========================= */
.btn {
  display: inline-block;
  padding: 14px 36px;
  background: var(--paper-dark);
  color: var(--ink-main);
  border: 2px solid var(--brown-dark);
  font-weight: bold;
  letter-spacing: 1px;
  text-transform: uppercase;
  box-shadow: 3px 3px 0 var(--brown-dark);
}

.btn:hover {
  background: #ddd2bf;
}

/* =========================
   HERO – CABEÇALHO CLÁSSICO
========================= */
.hero {
  padding: 90px 20px 110px;
  text-align: center;
  background:
    radial-gradient(circle at top, rgba(255,255,255,0.15), transparent 60%),
    repeating-linear-gradient(
      45deg,
      rgba(0,0,0,0.03),
      rgba(0,0,0,0.03) 2px,
      transparent 2px,
      transparent 6px
    ),
    var(--brown-dark);
  color: var(--paper-light);
  border-bottom: 10px double var(--gold-muted);
}

.hero h1 {
  font-size: 58px;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 26px;
}

.hero p {
  max-width: 780px;
  margin: 0 auto 40px;
  font-size: 20px;
  color: #f1eadf;
}

/* =========================
   FEATURES – PÁGINA IMPRESSA
========================= */
.features {
  padding: 90px 20px;
  background: var(--paper-dark);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 48px;
  border-top: 6px double var(--brown-dark);
  border-bottom: 6px double var(--brown-dark);
}

.feature {
  background: var(--paper-light);
  padding: 44px;
  border: 2px solid var(--brown-dark);
  box-shadow: 6px 6px 0 rgba(0,0,0,0.15);
}

.feature h3 {
  font-size: 22px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--brown-dark);
}

.feature p {
  color: var(--ink-soft);
}

/* =========================
   TOPO
========================= */
.topbar {
  padding: 20px;
  background: var(--paper-light);
  border-bottom: 4px solid var(--brown-dark);
}

/* =========================
   CATÁLOGO / ESTANTE
========================= */
.catalogo {
  padding: 90px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 56px;
}

.catalogo-intro {
  grid-column: 1 / -1;
  max-width: 760px;
  font-size: 18px;
  color: var(--ink-soft);
}

/* =========================
   LIVRO (ESTANTE)
========================= */
.livro {
  display: flex;
  background: var(--paper-light);
  border: 2px solid var(--brown-dark);
  box-shadow: 8px 8px 0 rgba(0,0,0,0.2);
}

/* LOMBADA */
.lombada {
  width: 60px;
  background: var(--brown-dark);
  color: var(--paper-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lombada span {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  letter-spacing: 2px;
  font-weight: bold;
  font-size: 14px;
}

/* CONTEÚDO DO LIVRO */
.livro-conteudo {
  padding: 24px;
  flex: 1;
}

.livro-conteudo h3 {
  margin-bottom: 20px;
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ESTADOS */
.livro.disponivel {
  background: var(--paper-light);
}

.livro.bloqueado {
  opacity: 0.6;
}

/* BOTÃO BLOQUEADO */
.btn-bloqueado {
  background: var(--paper-dark);
  color: var(--ink-main);
  cursor: not-allowed;
}

/* =========================
   CONTEÚDO (PDF)
========================= */
.conteudo {
  padding: 20px;
}

.conteudo iframe {
  width: 100%;
  height: 80vh;
  background: #fff;
  border: 3px solid var(--brown-dark);
}

/* =========================
   FOOTER
========================= */
footer {
  padding: 30px;
  text-align: center;
  background: var(--brown-dark);
  color: var(--paper-light);
  letter-spacing: 1.2px;
  text-transform: uppercase;
  border-top: 8px double var(--gold-muted);
}

/* =========================
   MOBILE
========================= */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 40px;
  }

  .hero p {
    font-size: 17px;
  }

  .livro {
    flex-direction: column;
  }

  .lombada {
    width: 100%;
    height: 50px;
  }

  .lombada span {
    writing-mode: horizontal-tb;
    transform: none;
  }
}