/* Navegación compartida, incluida al final de las hojas de estilo de cada página. */
.site-header { position: relative; gap: 24px; z-index: 20; }
.site-brand { flex-shrink: 0; display: inline-flex; }
.site-nav { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px 18px; min-width: 0; }
.site-nav > a, .site-directory > summary { color: #b5cbd7; font-size: .9rem; line-height: 1.5; text-decoration: none; padding: 10px 0; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: #36d3e9; }
.site-directory > summary { cursor: pointer; padding: 10px 14px; background: #102a35; border: 1px solid #286075; border-radius: 8px; }
.site-directory > summary:hover, .site-directory[open] > summary { color: #fff; border-color: #36d3e9; }
.site-page-count { margin-left: 5px; font-size: .75rem; color: #65dbea; }
.site-directory-panel { position: absolute; left: 0; right: 0; top: calc(100% + 12px); max-height: min(70vh, 640px); overflow-y: auto; overscroll-behavior: contain; padding: 24px; background: #0d1922; border: 1px solid #286075; border-radius: 14px; box-shadow: 0 20px 50px #0009; text-align: left; }
.site-directory-intro { color: #b5cbd7; line-height: 1.5; padding-bottom: 18px; border-bottom: 1px solid #23404f; margin-bottom: 20px; }
.site-directory-grid { display: grid; grid-template-columns: .85fr 1.4fr 1fr .9fr; gap: 24px; }
.site-directory-group > summary { font-size: .78rem; color: #65dbea; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 10px; cursor: pointer; padding: 5px 0; }
.site-directory-group ul { list-style: none; padding: 0; margin: 0; }
.site-directory-group a { display: block; padding: 8px; margin-left: -8px; border-radius: 6px; font-size: .88rem; line-height: 1.45; color: #dcebf3; text-decoration: none; overflow-wrap: anywhere; }
.site-directory-group a:hover, .site-directory-group a[aria-current="page"] { background: #183540; }
.skip-link { position: absolute; top: 8px; left: 16px; transform: translateY(-200%); z-index: 100; padding: 12px 18px; color: #fff; background: #12333e; border-radius: 6px; }
.skip-link:focus { transform: translateY(0); }
.site-nav a:focus-visible, .site-directory summary:focus-visible, .skip-link:focus-visible { outline: 2px solid #65dbea; outline-offset: 3px; }
@media (max-width: 900px) { .site-directory-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) {
    .site-header { align-items: flex-start; flex-direction: column; gap: 12px; }
    .site-nav { justify-content: flex-start; gap: 4px 16px; width: 100%; }
    .site-directory { width: 100%; margin-top: 6px; }
    .site-directory > summary { width: fit-content; }
    .site-directory-panel { padding: 20px; max-height: 65vh; }
}
@media (max-width: 420px) { .site-directory-grid { grid-template-columns: 1fr; gap: 24px; } }