/* Archivo histórico — estilo institucional */
:root {
  --ink: #1b2a41;
  --muted: #4a5568;
  --line: #c9d1dc;
  --paper: #ffffff;
  --accent: #0f3460;
}
* { box-sizing: border-box; }
html { font-size: 100%; }
body {
  margin: 0;
  font-family: "Source Serif 4", "Georgia", "Times New Roman", serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}
.site-header {
  border-bottom: 1px solid var(--line);
  background: #f7f8fa;
}
.site-header__inner {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 1rem;
}
.site-title {
  margin: 0 0 0.15rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--accent);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
.site-sub {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
nav[aria-label="Principal"] {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 0.88rem;
}
nav[aria-label="Principal"] a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
nav[aria-label="Principal"] a:hover,
nav[aria-label="Principal"] a:focus {
  border-bottom-color: var(--accent);
}
nav[aria-label="Principal"] a[aria-current="page"] {
  font-weight: 600;
  border-bottom-color: var(--accent);
}
main {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}
main h1 {
  font-size: 1.65rem;
  margin-top: 0;
  color: var(--accent);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
main h2 {
  font-size: 1.2rem;
  margin-top: 1.75rem;
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
main p, main li { color: var(--ink); }
main a { color: var(--accent); }
.site-footer {
  border-top: 1px solid var(--line);
  background: #f7f8fa;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 0.8rem;
  color: var(--muted);
}
.site-footer__inner {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1rem 1.25rem 1.5rem;
}
@media (max-width: 36rem) {
  main h1 { font-size: 1.4rem; }
}