/* ============================================================
   MERCÚRIO CASA 9 — Página principal: o índice-livro
   ============================================================ */

.contents-page {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--gutter) 6rem;
}

/* — A lombada: marca de dobra do livro, entre a capa e o índice —
   Um elemento curto e contido no cabeçalho da página de conteúdos,
   não uma linha que atravessa a lista (isso competiria com a leitura). */
.spine {
  position: relative;
  width: var(--spine-width);
  height: 56px;
  margin: 0.25rem auto 0;
  background: var(--rule);
}

.spine__mark {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--paper);
  padding: 0.6rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.spine__mark svg { width: 16px; height: 16px; opacity: 0.55; }

.contents-page__heading {
  text-align: center;
  padding: 0.5rem 0 1.5rem;
  position: relative;
  z-index: 1;
}

.contents-page__heading .label-caps {
  display: block;
  margin-bottom: 0.6rem;
}

.contents-page__heading h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  font-style: italic;
  font-weight: 500;
}

/* — Lista de entradas: índice remissivo — */
.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 1;
}

.index-entry {
  border-top: 1px solid var(--rule);
}
.index-entry:last-child { border-bottom: 1px solid var(--rule); }

.index-entry__link {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  align-items: baseline;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(1.5rem, 3vw, 2.1rem) clamp(0.5rem, 2vw, 1.25rem);
  transition: background 0.3s var(--ease);
  position: relative;
}

.index-entry__link:hover,
.index-entry__link:focus-visible {
  background: var(--wash);
}

.index-entry__folio {
  font-family: var(--face-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--ink-faint);
  align-self: start;
  padding-top: 0.3rem;
}

.index-entry__body {
  min-width: 0;
}

.index-entry__title {
  display: block;
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  font-weight: 500;
  line-height: 1.18;
  transition: letter-spacing 0.3s var(--ease);
}

.index-entry__link:hover .index-entry__title {
  letter-spacing: 0.005em;
}

.index-entry__subtitle {
  margin-top: 0.5rem;
  font-family: var(--face-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.4;
  max-width: 38rem;
}

.index-entry__meta {
  margin-top: 0.75rem;
  display: flex;
  gap: 1.1rem;
  align-items: center;
}

.index-entry__date {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.index-entry__dot {
  width: 3px; height: 3px;
  background: var(--ink-faint);
  border-radius: 50%;
}

.index-entry__readtime {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.index-entry__arrow {
  align-self: center;
  font-family: var(--face-display);
  font-size: 1.6rem;
  font-style: italic;
  color: var(--ink-faint);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.index-entry__link:hover .index-entry__arrow,
.index-entry__link:focus-visible .index-entry__arrow {
  opacity: 1;
  transform: translateX(0);
}

.index-entry__thumb {
  display: none;
}

/* Quando a entrada tem imagem de capa, mostra miniatura discreta */
.index-entry--with-image .index-entry__link {
  grid-template-columns: 4.5rem 1fr auto auto;
}
.index-entry--with-image .index-entry__thumb {
  display: block;
  width: 92px;
  height: 92px;
  overflow: hidden;
  filter: grayscale(1) contrast(1.05);
  flex-shrink: 0;
}
.index-entry--with-image .index-entry__thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
}

/* — Estado vazio — */
.contents-empty {
  text-align: center;
  padding: 5rem 1.5rem;
  position: relative;
  z-index: 1;
}
.contents-empty p:first-child {
  font-family: var(--face-display);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--ink-soft);
}
.contents-empty p:last-child {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

/* — Rodapé — */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 3.5rem var(--gutter) 4rem;
  border-top: 1px solid var(--rule);
  margin-top: 1rem;
}
.site-footer .masthead__glyph { width: 20px; height: 20px; opacity: 0.5; margin-bottom: 1rem; }
.site-footer p {
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin: 0.3rem 0;
}
.site-footer a { border-bottom: 1px solid var(--rule-strong); }
.site-footer a:hover { color: var(--ink); border-color: var(--ink); }

/* ============================================================
   Botão "voltar ao topo" — sutil, borda direita
   ============================================================ */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2.25rem);
  bottom: 2rem;
  width: 42px;
  height: 42px;
  border: 1px solid var(--rule-strong);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease), border-color 0.25s var(--ease), visibility 0.4s;
  z-index: 30;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover,
.to-top:focus-visible {
  border-color: var(--ink);
}

.to-top svg {
  width: 14px;
  height: 14px;
  stroke: var(--ink-soft);
}

/* Responsivo: índice principal em telas pequenas */
@media (max-width: 640px) {
  .spine { display: none; }
  .index-entry__link {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .index-entry__folio { padding-top: 0; }
  .index-entry__arrow { display: none; }
  .index-entry--with-image .index-entry__link { grid-template-columns: 1fr; }
  .index-entry--with-image .index-entry__thumb {
    width: 100%;
    height: 160px;
    order: -1;
  }
  .utility-nav { gap: 1rem; }
}