/* ==========================================================================
   ARTEFACTO VISUAL — Layout
   layout.css · v1.0 · 2026

   Estructura:
   1. Contenedores
   2. Grid system
   3. Estructura de página (header, main, footer)
   4. Secciones
   5. Utilidades de layout
   ========================================================================== */


/* --------------------------------------------------------------------------
   1. CONTENEDORES
   .container      → ancho estándar (1200px máx)
   .container-narrow → contenido editorial (760px máx)
   .container-full → ancho completo sin padding
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

.container-full {
  width: 100%;
  padding-inline: 0;
}

@media (min-width: 768px) {
  .container,
  .container-narrow {
    padding-inline: var(--space-8);
  }
}

@media (min-width: 1280px) {
  .container {
    padding-inline: var(--space-12);
  }
}


/* --------------------------------------------------------------------------
   2. GRID SYSTEM
   Sistema basado en CSS Grid nativo.
   
   .grid           → grid base configurable por variables
   .grid-2         → dos columnas iguales
   .grid-3         → tres columnas iguales
   .grid-4         → cuatro columnas iguales
   .grid-auto      → columnas automáticas responsivas
   .grid-sidebar   → layout con sidebar (contenido + lateral)
   -------------------------------------------------------------------------- */

.grid {
  display: grid;
  gap: var(--space-6);
}

/* Dos columnas: apilado en móvil, side-by-side desde tablet */
.grid-2 {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Tres columnas: apilado → 2 cols → 3 cols */
.grid-3 {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 480px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Cuatro columnas: apilado → 2 → 4 */
.grid-4 {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 480px) {
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Grid automático — columnas del mismo ancho mínimo que se ajustan solas
   Útil para galerías de proyectos y grids de tarjetas */
.grid-auto {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.grid-auto-sm {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

/* Layout con sidebar
   Por defecto: contenido arriba, sidebar abajo (móvil)
   Desde desktop: contenido principal + lateral fijo */
.grid-sidebar {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .grid-sidebar {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }
}

.grid-sidebar-left {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .grid-sidebar-left {
    grid-template-columns: 280px minmax(0, 1fr);
    align-items: start;
  }
}

/* Modificadores de gap */
.gap-2  { gap: var(--space-2); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }


/* --------------------------------------------------------------------------
   3. ESTRUCTURA DE PÁGINA
   Orden: skip-link → header → main → footer
   El body usa flex column para que el footer siempre quede al fondo.
   -------------------------------------------------------------------------- */

body {
  display: flex;
  flex-direction: column;
}

/* Header principal */
.site-header {
  position: absolute;
  top: 0;
  z-index: var(--z-sticky);
  width: 100%;
  background-color: var(--color-bg-surface);
  border-bottom: 0.5px solid var(--color-border-subtle);
  transition: background-color var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

.site-header.can-animate {
  transition: transform 0.3s ease,
              background-color var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base);
}

.site-header.is-fixed {
  position: fixed;
  transform: translate3d(0, -100%, 0);
}

.site-header.is-fixed.scroll-up {
  transform: translate3d(0, 0, 0);
}

/* Sombra sutil al hacer scroll (se añade con JS) */
.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--color-border-default);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-6);
}

/* Navegación principal */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  transition: var(--transition-colors);
}

.site-nav a:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-sunken);
}

.site-nav a.active {
  color: var(--color-brand-primary);
  background-color: var(--color-brand-primary-subtle);
}

/* Menú móvil (visible solo en móvil) */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.nav-toggle:hover {
  background-color: var(--color-bg-sunken);
  color: var(--color-text-primary);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

/* En móvil, la nav se oculta y aparece como panel */
@media (max-width: 767px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-bg-surface);
    border-bottom: 0.5px solid var(--color-border-default);
    padding: var(--space-4);
    gap: var(--space-1);
    box-shadow: var(--shadow-md);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: var(--space-3) var(--space-4);
  }
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo img {
  height: 32px;
  width: auto;
}

/* Selector de idioma — dropdown compacto */
.lang-switcher {
  position: relative;
  display: flex;
  align-items: center;
}

.lang-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  cursor: pointer;
  transition: var(--transition-colors);
  white-space: nowrap;
}

.lang-trigger:hover {
  background-color: var(--color-bg-sunken);
  color: var(--color-text-primary);
}

.lang-current {
  min-width: 20px;
  text-align: center;
}

.lang-arrow {
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.lang-switcher.open .lang-arrow {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  background-color: var(--color-bg-surface);
  border: 0.5px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  list-style: none;
  padding: var(--space-2) 0;
  margin: 0;
  min-width: 140px;
  z-index: var(--z-dropdown);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
}

.lang-switcher.open .lang-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.lang-dropdown a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  transition: var(--transition-colors);
}

.lang-dropdown a:hover {
  background-color: var(--color-bg-sunken);
  color: var(--color-text-primary);
}

.lang-dropdown a.active {
  color: var(--color-brand-primary);
  font-weight: var(--weight-medium);
}

.lang-code {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  min-width: 24px;
}

.lang-name {
  color: inherit;
}

/* Toggle de modo (light/dark) */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition-colors);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background-color: var(--color-bg-sunken);
  color: var(--color-text-primary);
}

/* Contenido principal */
main {
  flex: 1;
  width: 100%;
  overflow-x: hidden;
  padding-top: 64px; /* Compensa el header en position absolute/fixed */
}

/* Footer */
.site-footer {
  width: 100%;
  background-color: var(--color-bg-surface);
  border-top: 0.5px solid var(--color-border-subtle);
  padding-block: var(--space-8);
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.site-footer p {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  max-width: none;
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  justify-content: center;
}

/* Anular el margin-top global de li + li definido en base.css */
.footer-links li + li {
  margin-top: 0;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  text-decoration: none;
  transition: var(--transition-colors);
}

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


/* --------------------------------------------------------------------------
   4. SECCIONES
   Bloques verticales reutilizables en cualquier página.
   -------------------------------------------------------------------------- */

.section {
  padding-block: var(--section-gap);
}

.section-lg {
  padding-block: var(--section-gap-lg);
}

.section-sm {
  padding-block: var(--space-8);
}

/* Cabecera de sección (título + descripción opcionales) */
.section-header {
  margin-bottom: var(--space-10);
}

.section-header.centered {
  text-align: center;
}

.section-header.centered p {
  margin-inline: auto;
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-brand-primary);
  margin-bottom: var(--space-3);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 56ch;
  line-height: var(--leading-snug);
}

/* Fondos alternativos de sección */
.section-alt {
  background-color: var(--color-bg-sunken);
}

.section-brand {
  background-color: var(--color-brand-primary);
  color: var(--color-text-inverse);
}

.section-brand h2,
.section-brand h3,
.section-brand p {
  color: var(--color-text-inverse);
}

/* Divisor decorativo entre secciones */
.section-divider {
  width: 48px;
  height: 3px;
  background-color: var(--color-brand-primary);
  border-radius: var(--radius-full);
  margin-block: var(--space-6);
}

.section-divider.centered {
  margin-inline: auto;
}


/* --------------------------------------------------------------------------
   5. UTILIDADES DE LAYOUT
   Clases de uso rápido para casos puntuales.
   No abusar — el layout estructural va en los bloques anteriores.
   -------------------------------------------------------------------------- */

/* Flexbox */
.flex         { display: flex; }
.flex-col     { display: flex; flex-direction: column; }
.flex-wrap    { flex-wrap: wrap; }
.items-start  { align-items: flex-start; }
.items-center { align-items: center; }
.items-end    { align-items: flex-end; }
.justify-start  { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end    { justify-content: flex-end; }
.justify-between{ justify-content: space-between; }
.flex-1       { flex: 1; }
.flex-shrink-0{ flex-shrink: 0; }
.gap-2  { gap: var(--space-2); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }

/* Visibilidad responsiva */
.hide-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hide-mobile {
    display: flex;
  }
}

.hide-desktop {
  display: flex;
}

@media (min-width: 768px) {
  .hide-desktop {
    display: none;
  }
}

/* Espaciado vertical de stack */
.stack-4 > * + * { margin-top: var(--space-4); }
.stack-6 > * + * { margin-top: var(--space-6); }
.stack-8 > * + * { margin-top: var(--space-8); }

/* Centrado absoluto (para overlays y loaders) */
.absolute-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Ancho completo */
.w-full { width: 100%; }

/* Overflow */
.overflow-hidden { overflow: hidden; }

/* Posicionamiento relativo (contexto para hijos absolutos) */
.relative { position: relative; }