/* Componentes reutilizables: header, nav, botones, cards, toggles */

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-alt);
  border-bottom: 3px solid var(--color-primary);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-2);
  height: var(--header-height);
}

.logo img {
  height: 28px;
  width: auto;
  image-rendering: pixelated;
}

/* ---------- Nav ---------- */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: var(--space-3);
}

.nav-list a {
  font-family: var(--font-display), monospace;
  font-size: 0.65rem;
  color: var(--color-text);
  padding: var(--space-1) 0;
  position: relative;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-primary);
}

.nav-list a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 3px;
  background: var(--color-accent-yellow);
  transition: width 0.15s ease;
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after {
  width: 100%;
}

/* .nav-toggle también lleva la clase .control-btn (tamaño, borde, colores compartidos
   con sonido/tema/idioma); aquí solo lo que lo distingue: barras apiladas en vez de icono,
   y oculto por defecto hasta el breakpoint móvil. Selector compuesto para ganar siempre
   a la regla base de .control-btn sin depender del orden en el archivo. */
.nav-toggle.control-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  width: 20px;
  height: 2px;
  background: var(--color-primary);
}

/* ---------- Header controls (sonido / tema / idioma) ---------- */
.header-controls {
  display: flex;
  gap: var(--space-1);
}

.control-btn {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  background: var(--color-bg-elevated);
  color: var(--color-primary);
  font-size: 1rem;
  transition: border-color 0.15s ease, transform 0.1s ease;
}

.control-btn:hover {
  border-color: var(--color-primary);
}

.control-btn:active {
  transform: translate(1px, 1px);
}

.lang-toggle {
  font-family: var(--font-display), monospace;
  font-size: 0.6rem;
}

/* Solo se muestra el idioma AL QUE SE CAMBIA, no el idioma activo */
.lang-toggle .lang-es,
.lang-toggle .lang-en {
  display: none;
}

html[lang='es'] .lang-toggle .lang-en {
  display: inline;
}

html[lang='en'] .lang-toggle .lang-es {
  display: inline;
}

.icon-sound-off,
.icon-theme-light {
  display: none;
}

#soundToggle[aria-pressed='true'] .icon-sound-on {
  display: none;
}

#soundToggle[aria-pressed='true'] .icon-sound-off {
  display: inline;
}

html[data-theme='light'] #themeToggle .icon-theme-dark {
  display: none;
}

html[data-theme='light'] #themeToggle .icon-theme-light {
  display: inline;
}

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display), monospace;
  font-size: 0.7rem;
  line-height: 1.4;
  padding: 1rem 1.5rem;
  border: 2px solid var(--color-primary);
  background: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: var(--pixel-unit) var(--pixel-unit) 0 0 var(--color-primary-dark);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 0 var(--color-primary-dark);
}

.btn:active {
  transform: translate(var(--pixel-unit), var(--pixel-unit));
  box-shadow: 0 0 0 0 var(--color-primary-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  box-shadow: var(--pixel-unit) var(--pixel-unit) 0 0 var(--color-primary);
}

.btn-ghost:hover {
  box-shadow: 2px 2px 0 0 var(--color-primary);
}

/* ---------- Panel / card pixel ---------- */
.pixel-panel {
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  box-shadow: var(--pixel-unit) var(--pixel-unit) 0 0 var(--color-primary);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.pixel-panel:hover {
  border-color: var(--color-primary);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 var(--color-primary);
}

@media (prefers-reduced-motion: reduce) {
  .btn,
  .pixel-panel {
    transition: none;
  }
}

@media (max-width: 480px) {
  .logo img {
    height: 20px;
  }

  .header-controls {
    gap: 6px;
  }

  .control-btn {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }

  .lang-toggle {
    font-size: 0.55rem;
  }

  .header-inner {
    padding: 0 var(--space-1);
  }
}

@media (max-width: 760px) {
  .nav-toggle.control-btn {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: calc(var(--header-height) - 8px);
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg-alt);
    border: 2px solid var(--color-primary);
    min-width: 200px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list a {
    display: block;
    padding: var(--space-2);
    border-bottom: 1px solid var(--color-border);
  }

  .nav-list a::after {
    display: none;
  }
}

/* ---------- Botón flotante "volver arriba" ----------
 * Oculto en la parte superior; js/back-to-top.js añade .is-visible al pasar el umbral de scroll.
 * Mismo lenguaje visual que .btn (cian + sombra pixel). 48x48 px de área táctil.
 */
.back-to-top {
  position: fixed;
  right: max(var(--space-2), env(safe-area-inset-right));
  bottom: max(var(--space-2), env(safe-area-inset-bottom));
  z-index: 90; /* sobre el contenido, por debajo del header (100) y la skip-link (1000) */
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 2px solid var(--color-primary);
  background: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: var(--pixel-unit) var(--pixel-unit) 0 0 var(--color-primary-dark);
  cursor: pointer;

  /* Estado oculto: desplazado hacia abajo y transparente, sin recibir clics ni foco */
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  /* steps() da una aparición "a saltos" de 8-bit en lugar de un fundido continuo */
  transition:
    opacity 0.24s steps(4, end),
    transform 0.24s steps(4, end),
    visibility 0s linear 0.24s,
    box-shadow 0.15s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition:
    opacity 0.24s steps(4, end),
    transform 0.24s steps(4, end),
    visibility 0s,
    box-shadow 0.15s ease;
}

.back-to-top svg {
  fill: currentColor;
}

.back-to-top.is-visible:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 0 var(--color-primary-dark);
}

.back-to-top.is-visible:active {
  transform: translate(var(--pixel-unit), var(--pixel-unit));
  box-shadow: 0 0 0 0 var(--color-primary-dark);
}

.back-to-top:focus-visible {
  outline: 3px solid var(--color-accent-yellow);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top,
  .back-to-top.is-visible {
    transition: none;
    transform: none;
  }
}