/* =========================
   RESET
========================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* =========================
   VARIABLES UNIFICADAS
========================= */
:root {
  /* 🔵 FONDO AZUL CELESTE CLARO */
  --color-bg-main: #E0F2FE;        /* azul celeste muy claro */
  --color-bg-card: #FFFFFF;        /* tarjetas blancas */
  --color-bg-soft: #F0F9FF;        /* azul muy suave */

  --color-text-main: #0F172A;      /* texto oscuro */
  --color-text-muted: #475569;     /* gris azulado */

  --color-border: #CBD5E1;

  --color-primary: #0EA5E9;        /* azul principal */
  --color-primary-strong: #0284C7; /* azul más intenso */

  --shadow-soft: 0 10px 25px rgba(2, 132, 199, 0.08);
}

/* =========================
   BODY
========================= */
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* =========================
   HEADER / BREADCRUMB
========================= */
.header {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  background: #F0F9FF;
}

.breadcrumb-nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: .5rem;
  font-size: .9rem;
}

.breadcrumb-link {
  color: var(--color-primary);
  text-decoration: none;
  transition: color .2s ease;
}

.breadcrumb-link:hover {
  color: var(--color-primary-strong);
}

.breadcrumb-current {
  color: var(--color-text-muted);
}

/* =========================
   CONTAINER
========================= */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* =========================
   HERO
========================= */
.hero {
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 2.2rem;
  margin-bottom: .75rem;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.subtitle {
  max-width: 760px;
  color: var(--color-text-muted);
}

.meta {
  margin-top: 1rem;
  font-size: .85rem;
  color: var(--color-text-muted);
}

.badge {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  padding: .25rem .5rem;
  border-radius: 6px;
  margin-right: .5rem;
}

/* =========================
   ACTION BUTTONS
========================= */
.actions {
  display: flex;
  gap: .75rem;
  margin: 1.75rem 0;
  flex-wrap: wrap;
}

.btn {
  border-radius: 12px;
  padding: .65rem 1.2rem;
  font-size: .9rem;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all .2s ease;
}

.btn.primary {
  background: var(--color-primary);
  color: white;
  font-weight: 600;
}

.btn.primary:hover {
  background: var(--color-primary-strong);
  transform: translateY(-2px);
}

.btn.secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn.secondary:hover {
  background: rgba(14, 165, 233, 0.08);
}

/* =========================
   TOC
========================= */
.toc {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-soft);
}

.toc a {
  color: var(--color-primary);
  text-decoration: none;
  font-size: .9rem;
}

.toc a:hover {
  color: var(--color-primary-strong);
}

/* =========================
   PANELS
========================= */
.panel {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 2rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-soft);
}

.panel h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.panel h3 {
  font-size: 1.15rem;
  margin-top: 1.75rem;
}

.panel p,
.panel li {
  color: var(--color-text-muted);
  font-size: .95rem;
}

/* =========================
   CALLOUT
========================= */
.callout {
  background: rgba(14, 165, 233, 0.08);
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.25rem;
  border-radius: 10px;
  margin: 1.25rem 0;
}

/* =========================
   GRID
========================= */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 1.25rem;
  transition: transform .2s ease;
}

.card:hover {
  transform: translateY(-4px);
}

/* =========================
   FOOTER
========================= */
.footer {
  margin-top: 4rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: .85rem;
  color: var(--color-text-muted);
}

.footer-links a {
  margin-left: 1rem;
  color: var(--color-primary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-primary-strong);
}

/* =========================
   LANGUAGE SWITCHER
========================= */
.language-switcher {
  text-align: right;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.language-switcher a {
  color: var(--color-text-muted);
  text-decoration: none;
  margin-left: 0.4rem;
  transition: color .2s ease;
}

.language-switcher a:hover {
  color: var(--color-primary);
}