/* Step 2: Índice em 4 colunas + hover pro + títulos sem quebra */
nav.toc { --toc-radius: 12px; --toc-gap: 10px; --toc-pad: 10px; --toc-border: 1px; --toc-accent: #8a6a4a; }
nav.toc strong { display:block; margin-bottom: .5rem; font-weight: 700; font-size: 1.05rem; }
nav.toc ul {
  list-style: none;
  margin: .25rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: var(--toc-gap);
}
nav.toc li { min-width: 0; } /* permite ellipsis */
nav.toc a {
  display: block;
  padding: var(--toc-pad);
  border: var(--toc-border) solid rgba(0,0,0,.10);
  border-radius: var(--toc-radius);
  background: linear-gradient(180deg, rgba(255,255,255,.9), rgba(255,255,255,.85));
  text-decoration: none;
  color: inherit;
  font-weight: 500;
  line-height: 1.25;
  white-space: nowrap;          /* não quebra linha */
  overflow: hidden;             /* corta excedente */
  text-overflow: ellipsis;      /* coloca reticências */
  box-shadow: 0 0 0 rgba(0,0,0,0);
  transition: transform .12s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
nav.toc a:hover,
nav.toc a:focus-visible {
  background: #fff;
  border-color: color-mix(in srgb, var(--toc-accent) 35%, #0000);
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(0,0,0,.08);
  outline: none;
}
/* Acessibilidade ao focar via teclado */
nav.toc a:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--toc-accent) 25%, #ffffff); }

/* Responsivo: reduz colunas em telas menores */
@media (max-width: 1200px) {
  nav.toc ul { grid-template-columns: repeat(3, minmax(0,1fr)); }
}
@media (max-width: 900px) {
  nav.toc ul { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 560px) {
  nav.toc ul { grid-template-columns: 1fr; }
}

/* Dark mode (se o site usar) */
@media (prefers-color-scheme: dark) {
  nav.toc a {
    border-color: rgba(255,255,255,.12);
    background: linear-gradient(180deg, rgba(34,34,34,.9), rgba(30,30,30,.85));
  }
  nav.toc a:hover,
  nav.toc a:focus-visible {
    background: #262626;
    box-shadow: 0 6px 18px rgba(0,0,0,.35);
  }
}