/* ==========================================================================
   WEB SEGUROS — Hoja de estilos principal
   Diseño limpio, sobrio y profesional. Mobile-first y responsive.
   Un solo archivo CSS para todo el sitio (requisito del proyecto).
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Variables de diseño (tema)
   -------------------------------------------------------------------------- */
:root {
  /* Paleta: azules de confianza + neutros sobrios */
  --color-primary:        #1b3a5b;  /* azul corporativo profundo */
  --color-primary-dark:   #122a44;
  --color-accent:         #2e7d6b;  /* verde sobrio (acción/positivo) */
  --color-accent-dark:    #245d50;
  --color-text:           #1f2933;
  --color-text-soft:      #52606d;
  --color-muted:          #7b8794;
  --color-bg:             #ffffff;
  --color-bg-alt:         #f4f7fa;  /* fondo de secciones alternas */
  --color-border:         #dde3ea;
  --color-warning-bg:     #fff7e6;
  --color-warning-border: #f0c674;

  /* Tipografía */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-heading: var(--font-base);

  /* Espaciado y forma */
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(18, 42, 68, 0.08);
  --shadow-md: 0 4px 14px rgba(18, 42, 68, 0.10);
  --maxw: 1080px;
  --maxw-narrow: 760px; /* ancho de lectura cómodo para artículos */
}

/* --------------------------------------------------------------------------
   2. Reset ligero y base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-base);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover, a:focus { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.25;
  color: var(--color-primary-dark);
  margin: 0 0 .6em;
  font-weight: 700;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.55rem; margin-top: 1.6em; }
h3 { font-size: 1.2rem; margin-top: 1.4em; }

p { margin: 0 0 1.1em; }

ul, ol { margin: 0 0 1.1em; padding-left: 1.4em; }
li { margin-bottom: .4em; }

/* Contenedores */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.1rem;
}
.container--narrow { max-width: var(--maxw-narrow); }

/* Accesibilidad: salto al contenido */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: .6rem 1rem;
  z-index: 1000;
}
.skip-link:focus { left: .5rem; top: .5rem; }

/* --------------------------------------------------------------------------
   3. Cabecera y navegación
   -------------------------------------------------------------------------- */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: .8rem;
}
.brand {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand span { color: var(--color-accent); }

/* Botón hamburguesa (solo móvil) */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-primary-dark);
  transition: transform .2s ease, opacity .2s ease;
}

/* Navegación principal */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.main-nav a {
  display: block;
  padding: .7rem .9rem;
  color: var(--color-text);
  border-radius: var(--radius);
  font-weight: 600;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  background: var(--color-bg-alt);
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* En móvil el menú se oculta hasta abrirlo */
@media (max-width: 800px) {
  .main-nav {
    display: none;
    width: 100%;
    flex-basis: 100%;
  }
  .main-nav.is-open { display: block; padding-bottom: .6rem; }
  .site-header__inner { flex-wrap: wrap; }
}

/* En escritorio: menú horizontal y sin hamburguesa */
@media (min-width: 801px) {
  .nav-toggle { display: none; }
  .main-nav { display: block !important; }
  .main-nav ul { flex-direction: row; align-items: center; gap: .3rem; }
}

/* --------------------------------------------------------------------------
   4. Hero / cabeceras de página
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding-block: 3rem;
}
.hero h1 { color: #fff; font-size: 2.2rem; }
.hero p { color: #dce6f1; font-size: 1.15rem; max-width: 38em; margin-bottom: 0; }

.page-head {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding-block: 2.2rem;
}
.page-head h1 { margin-bottom: .3em; }
.page-head .lead { color: var(--color-text-soft); font-size: 1.12rem; margin-bottom: 0; }

/* Migas de pan */
.breadcrumb {
  font-size: .9rem;
  color: var(--color-muted);
  padding-block: .9rem 0;
}
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: .35rem; margin: 0; padding: 0; }
.breadcrumb li::after { content: "›"; margin-left: .35rem; color: var(--color-muted); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--color-text-soft); }

/* --------------------------------------------------------------------------
   5. Secciones y rejillas de tarjetas
   -------------------------------------------------------------------------- */
.section { padding-block: 2.6rem; }
.section--alt { background: var(--color-bg-alt); }
.section__title { text-align: center; margin-bottom: .4em; }
.section__intro { text-align: center; color: var(--color-text-soft); max-width: 44em; margin: 0 auto 2rem; }

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
}
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .card-grid--3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card h3 { margin-top: 0; }
.card p { color: var(--color-text-soft); flex-grow: 1; }
.card__tag {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  background: #e7f1ee;
  padding: .2rem .6rem;
  border-radius: 999px;
  margin-bottom: .8rem;
  align-self: flex-start;
}

/* Listas de enlaces a satélites (en pilares) */
.link-list { list-style: none; padding: 0; margin: 0; }
.link-list li { margin-bottom: .7rem; }
.link-list a {
  display: block;
  padding: .9rem 1.1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-weight: 600;
  transition: border-color .2s ease, background .2s ease;
}
.link-list a:hover { border-color: var(--color-accent); background: var(--color-bg-alt); text-decoration: none; }

/* --------------------------------------------------------------------------
   6. Botones
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  font-weight: 700;
  padding: .8rem 1.4rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  text-align: center;
  font-size: 1rem;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { background: var(--color-accent-dark); }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.6); }
.btn--ghost:hover { background: rgba(255,255,255,.12); }
.btn--block { display: block; width: 100%; }

/* --------------------------------------------------------------------------
   7. Artículos (contenido largo)
   -------------------------------------------------------------------------- */
.article { padding-block: 2.2rem; }
.article p, .article ul, .article ol { max-width: 40em; }
.article h2, .article h3 { max-width: 40em; }

/* Sello "última actualización" + autor (E-E-A-T) */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem 1rem;
  font-size: .9rem;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
  margin-bottom: 1.6rem;
}
.article-meta .updated {
  font-weight: 600;
  color: var(--color-accent-dark);
  background: #e7f1ee;
  padding: .2rem .6rem;
  border-radius: 999px;
}

/* Caja de aviso / disclaimer */
.callout {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-left-width: 4px;
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin: 1.6rem 0;
  font-size: .96rem;
}
.callout strong { color: var(--color-primary-dark); }

/* Marcador de dato pendiente de verificar (YMYL) */
.verify {
  background: #fdecec;
  border: 1px dashed #e0a3a3;
  color: #9b2c2c;
  font-size: .85rem;
  padding: .1rem .4rem;
  border-radius: 4px;
}

/* Tabla de contenidos / cajas de info */
.infobox {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin: 1.6rem 0;
}
.infobox h2, .infobox h3 { margin-top: 0; }

/* Caja de enlaces relacionados (enlazado interno) */
.related {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.6rem;
  margin-top: 2.4rem;
}
.related h2 { margin-top: 0; font-size: 1.25rem; }
.related ul { list-style: none; padding: 0; margin: 0; }
.related li { margin-bottom: .5rem; }

/* --------------------------------------------------------------------------
   8. Herramientas (formularios y resultados)
   -------------------------------------------------------------------------- */
.tool {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.6rem;
  margin: 1.8rem 0;
}
.form-row { margin-bottom: 1.2rem; }
.form-row label {
  display: block;
  font-weight: 600;
  margin-bottom: .35rem;
  color: var(--color-primary-dark);
}
.form-row select,
.form-row input[type="number"],
.form-row input[type="text"],
.form-row input[type="email"],
.form-row textarea {
  width: 100%;
  padding: .7rem .8rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  color: var(--color-text);
}
.form-row select:focus,
.form-row input:focus,
.form-row textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  border-color: var(--color-accent);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
@media (min-width: 620px) { .form-grid { grid-template-columns: repeat(2, 1fr); } }

/* Resultado de la herramienta */
.tool-result {
  margin-top: 1.4rem;
  padding: 1.3rem 1.5rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.tool-result[hidden] { display: none; }
.tool-result .range {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-accent-dark);
}

/* Tabla comparativa */
.table-wrap { overflow-x: auto; margin: 1.6rem 0; }
table.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: .96rem;
  min-width: 520px;
}
table.compare th, table.compare td {
  border: 1px solid var(--color-border);
  padding: .7rem .8rem;
  text-align: left;
  vertical-align: top;
}
table.compare thead th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
}
table.compare tbody tr:nth-child(even) { background: var(--color-bg-alt); }

/* --------------------------------------------------------------------------
   9. Pie de página
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-primary-dark);
  color: #c7d3e0;
  padding-block: 2.4rem 1.4rem;
  margin-top: 3rem;
  font-size: .95rem;
}
.site-footer a { color: #e2e9f1; }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}
@media (min-width: 640px) { .footer-grid { grid-template-columns: repeat(3, 1fr); } }
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: .8rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .45rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  margin-top: 1.8rem;
  padding-top: 1.2rem;
  font-size: .85rem;
  color: var(--color-muted);
  text-align: center;
}

/* Utilidades */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}