/* Variables CSS para temas claro y oscuro */
:root {
  /* Colores modo claro */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --accent: #0066cc;
  --accent-hover: #0052a3;
  --border: #d0d0d0;
  --focus-ring: #0066cc;
  
  /* Espaciado */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Tipografía */
  --font-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-base: 1rem;
  --line-height-base: 1.6;
}

/* Modo oscuro */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --accent: #4d9fff;
    --accent-hover: #6bb0ff;
    --border: #404040;
    --focus-ring: #4d9fff;
  }
}

/* Reset y base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 100%; /* Permite zoom del navegador */
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Skip link - accesibilidad */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: white;
  padding: var(--spacing-sm);
  text-decoration: none;
  z-index: 100;
  font-weight: bold;
}

.skip-link:focus {
  top: 0;
}

/* Navegación */
header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent);
  text-decoration: none;
}

.logo:hover,
.logo:focus {
  color: var(--accent-hover);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.nav-menu a {
  color: var(--text-primary);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  transition: background-color 0.2s;
}

.nav-menu a:hover,
.nav-menu a:focus {
  background-color: var(--bg-primary);
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.nav-menu a[aria-current="page"] {
  font-weight: bold;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

/* Selector de idioma */
.idioma-btn {
  background-color: var(--accent);
  color: var(--bg-primary);
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 500;
  transition: background-color 0.2s, outline 0.2s;
  position: relative;
}

.idioma-btn:hover {
  background-color: var(--accent-hover);
}

.idioma-btn:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.idioma-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  list-style: none;
  margin-top: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 100;
}

.idioma-menu li {
  margin: 0;
  padding: 0;
}

.idioma-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  text-decoration: none;
  transition: background-color 0.2s;
  border-left: 3px solid transparent;
}

.idioma-link:hover,
.idioma-link:focus {
  background-color: var(--bg-secondary);
  outline: 2px solid var(--focus-ring);
  outline-offset: -2px;
}

.idioma-link[aria-current="page"] {
  background-color: var(--bg-secondary);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* Main content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  min-height: 60vh;
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  margin-top: var(--spacing-lg);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
  margin-bottom: var(--spacing-md);
  max-width: 70ch;
}

/* Enlaces */
a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--accent-hover);
}

a:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Botones */
.btn, button[type="submit"] {
  display: inline-block;
  background-color: var(--accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: 4px;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
  min-height: 44px;
  min-width: 44px;
}

.btn:hover,
.btn:focus,
button[type="submit"]:hover,
button[type="submit"]:focus {
  background-color: var(--accent-hover);
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Artículos */
.articulo {
  max-width: 800px;
  margin: 0 auto;
}

.articulo-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--border);
}

.articulo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.categorias {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  list-style: none;
}

.categoria {
  background-color: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 16px;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text-primary);
  display: inline-block;
  transition: background-color 0.2s, border-color 0.2s;
}

a.categoria:hover,
a.categoria:focus {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

.autor-info {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-top: var(--spacing-md);
}

.autor-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}

.autor-nombre {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
}

.autor-bio {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

.articulo-contenido {
  font-size: 1.125rem;
  line-height: 1.7;
}

/* Grid de artículos */
.articulos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.articulo-card {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.articulo-card h3 {
  margin-top: 0;
  font-size: 1.25rem;
}

.articulo-card time {
  display: block;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

/* Lista de artículos */
.articulos-lista {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.articulo-item {
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.articulo-item:last-child {
  border-bottom: none;
}

.leer-mas {
  font-weight: 500;
}

/* Formularios */
.contact-form {
  max-width: 600px;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 44px;
}

input:focus,
textarea:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-color: var(--accent);
}

textarea {
  resize: vertical;
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  margin-top: var(--spacing-xl);
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.footer-section h2,
.footer-section h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
}

.footer-bottom {
  max-width: 1200px;
  margin: var(--spacing-lg) auto 0;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
}

/* Code blocks */
pre {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

code {
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .nav-menu {
    width: 100%;
  }
  
  .autor-info {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Soporte para zoom 200% y 400% */
@media (min-width: 1200px) {
  html {
    font-size: 100%;
  }
}

/* Asegurar que el contenido no se pierda en zoom */
* {
  max-width: 100%;
}

img {
  height: auto;
}

/* Animaciones reducidas para usuarios que lo prefieran */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Navegación del blog */
.blog-nav {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-radius: 8px;
}

.blog-nav a {
  font-weight: 500;
}

/* Listas de categorías y autores */
.categorias-lista,
.autores-lista {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.categoria-seccion,
.autor-seccion {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.categoria-seccion h2,
.autor-seccion h2 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 1.25rem;
}

.categoria-seccion p,
.autor-seccion p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Bio destacada del autor */
.autor-bio-destacada {
  font-size: 1.125rem;
  color: var(--text-secondary);
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  margin-bottom: var(--spacing-lg);
}

/* Enlaces en nombres de autor */
.autor-nombre a {
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  transition: color 0.2s;
}

.autor-nombre a:hover,
.autor-nombre a:focus {
  color: var(--accent);
}