.saltar-a {
    color: #ffffff !important; 
    background-color: #004d40; 
    padding: 0.5em 1em;
    position: absolute;
    left: -9999px;
    z-index: 9999;
    border: 3px solid #ffc107; 
}


.saltar-a:focus {
    position: fixed; 
    left: 10px;
    top: 10px;
    color: #ffffff !important; 
    text-decoration: underline;
}


body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 17px;
    color: #222;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
    line-height: 1.7;
}

header, footer {
    background-color: #004d40;
    color: #ffffff;
    padding: 1.25em 1.5em;
    margin: 0;
}

header h1 {
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 2.2em;
    margin: 0;
    padding: 0;
}

header h1 a, footer a {
    color: #ffffff;
    text-decoration: none;
}

header h1 a:hover, footer a:hover, footer a:focus {
    text-decoration: underline;
}

header nav {
    margin-top: 0.5em;
}

header nav a {
    color: #ffffff;
    font-size: 1.1em;
    padding-right: 1.5em;
}

footer {
    font-size: 0.9em;
    text-align: center;
    margin-top: 2.5em;
    border-top: 5px solid #00251a;
}

footer p {
    margin: 0.5em 0;
}

main {
    max-width: 850px;
    margin: 2em auto;
    padding: 0 1em;
}

article {
    background-color: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1em 2.5em 2.5em 2.5em;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.07);
}

article h2 {
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 2.4em;
    color: #004d40;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

article h3 {
    font-size: 1.7em;
    color: #333;
    border-bottom: 2px solid #004d40;
    padding-bottom: 0.3em;
    margin-top: 2em;
    margin-bottom: 1.25em;
}

article p, article li {
    margin-bottom: 1em;
}

article strong {
    color: #00251a;
}

nav[aria-label="Migas de pan"] {
    font-size: 0.9em;
    margin-bottom: 1.5em;
    padding: 0.5em 0;
}

nav[aria-label="Migas de pan"] ol {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav[aria-label="Migas de pan"] li {
    margin: 0;
}

nav[aria-label="Migas de pan"] li:not(:last-child)::after {
    content: '>';
    margin: 0 0.75em;
    color: #777;
}

nav[aria-label="Migas de pan"] a {
    color: #004d40;
    text-decoration: none;
}

nav[aria-label="Migas de pan"] a:hover {
    text-decoration: underline;
}

nav[aria-label="Migas de pan"] span[aria-current="page"] {
    color: #555;
    font-weight: bold;
}

#tabla-de-contenidos {
    background-color: #e8f5e9;
    border: 1px solid #b2dfdb;
    border-radius: 8px;
    padding: 1em 1.5em 1.5em 1.5em;
    margin-bottom: 2em;
}

#tabla-de-contenidos h3 {
    border-bottom: none;
    margin-top: 0.5em;
    margin-bottom: 0.75em;
    color: #004d40;
}

#tabla-de-contenidos ul {
    margin: 0;
    padding-left: 1.5em;
}

#tabla-de-contenidos li {
    margin-bottom: 0.5em;
}

#tabla-de-contenidos a {
    text-decoration: none;
    color: #004d40;
    font-weight: bold;
}

#tabla-de-contenidos a:hover,
#tabla-de-contenidos a:focus {
    text-decoration: underline;
}

img, iframe {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5em auto;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
    font-size: 0.95em;
}

table caption {
    font-size: 1em;
    font-style: italic;
    padding: 0.5em;
    margin-bottom: 0.5em;
    color: #555;
}

table th, table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

table th {
    background-color: #e8f5e9;
    color: #00251a;
    font-weight: bold;
}

table tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

dl {
    margin: 1.5em 0;
}

dt {
    font-weight: bold;
    color: #222;
    margin-top: 1em;
}

dd {
    margin-left: 1.5em;
    margin-bottom: 1em;
}

abbr[title] {
    text-decoration: underline dotted;
    cursor: help;
}

a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 3px solid #00695c;
    outline-offset: 2px;
}

html {
    scroll-behavior: smooth;
}

/* ===============================================================
   --- MODO OSCURO ---
   =============================================================== */

body.modo-oscuro {
  --color-primario: #4a90e2;
  --color-primario-oscuro: #1c3d5a;
  --color-enlace: #7ab4ff;
  --color-texto: #e4e4e4;
  --color-texto-claro: #ffffff;
  --color-fondo: #121212;
  --color-fondo-secundario: #1e1e1e;
  --color-borde-sutil: #333;

  background-color: var(--color-fondo);
  color: var(--color-texto);
}

/* Header y footer adaptados */
body.modo-oscuro header,
body.modo-oscuro footer {
  background-color: var(--color-primario-oscuro);
  color: var(--color-texto-claro);
}

/* Enlaces en modo oscuro */
body.modo-oscuro a {
  color: var(--color-enlace);
}

/* Secciones y contenedores */
body.modo-oscuro section,
body.modo-oscuro main,
body.modo-oscuro .container {
  background-color: var(--color-fondo-secundario);
  color: var(--color-texto);
  border-color: var(--color-borde-sutil);
}

/* Navegación */
body.modo-oscuro .nav-principal li a,
body.modo-oscuro .nav-letras li a {
  background-color: var(--color-fondo-secundario);
  color: var(--color-texto-claro);
}

body.modo-oscuro .nav-principal li a:hover,
body.modo-oscuro .nav-letras li a:hover {
  background-color: var(--color-primario);
  color: var(--color-texto-claro);
}
/* ===============================================================
   --- AJUSTES EXTRA DE MODO OSCURO (Tablas, Tabla de contenidos) ---
   =============================================================== */

/* Tabla de contenidos */
body.modo-oscuro #tabla-de-contenidos {
  background-color: #1e2a33; /* fondo más oscuro */
  border: 1px solid #333;
  color: #e4e4e4;
}

body.modo-oscuro #tabla-de-contenidos h3 {
  color: #7ab4ff; /* tono azul claro para resaltar */
}

/* Tablas */
body.modo-oscuro table {
  background-color: #1a1a1a;
  border: 1px solid #333;
}

body.modo-oscuro th {
  background-color: #2a2a2a; /* cabecera gris oscura */
  color: #ffffff;
}

body.modo-oscuro td {
  background-color: #1a1a1a;
  color: #e4e4e4;
  border: 1px solid #333;
}

/* Bordes más suaves y contrastados */
body.modo-oscuro th,
body.modo-oscuro td {
  border-color: #444;
}