/* ============================================================
   app.css — Chrome del shell de la PWA.

   Solo estructura y helpers del cascaron (reset, layout, barra
   superior, toggle de tema, accesibilidad). Las pantallas y los
   componentes se agregan despues.

   Todo se construye sobre los tokens de tokens.css. Ningun color,
   tamano o radio literal: siempre var(--...), para que el modo
   oscuro funcione solo. Cargar SIEMPRE despues de tokens.css.
   ============================================================ */

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

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

body {
  min-height: 100dvh;
}

img,
svg {
  max-width: 100%;
  display: block;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

a {
  color: var(--color-amber-deep);
}

/* ---- Enlace para saltar al contenido (accesibilidad) ---- */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: calc(-1 * var(--space-12));
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  color: var(--color-ink);
  border-radius: var(--radius);
  box-shadow: var(--elev-2);
  transition: top var(--t-base);
}

.skip-link:focus {
  top: var(--space-2);
}

/* ---- Contenedor del shell: mobile-first, centrado ---- */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
}

/* ---- Barra superior persistente ---- */
.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  padding-top: max(var(--space-3), env(safe-area-inset-top));
}

.app-topbar__brand {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-h3);
  color: var(--color-ink);
}

/* ---- Contenido principal ---- */
.app-main {
  flex: 1;
  padding: var(--space-4);
  padding-bottom: max(var(--space-6), env(safe-area-inset-bottom));
}

.app-cargando {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-10) var(--space-4);
  color: var(--color-ink-2);
}

/* ---- Toggle de tema (parte del shell) ---- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-line);
  background: var(--color-surface-2);
  color: var(--color-ink);
  border-radius: var(--radius-pill);
  transition: background var(--t-base), border-color var(--t-base);
}

.theme-toggle:hover {
  border-color: var(--color-amber-ring);
}

.theme-toggle__icon {
  font-size: var(--fs-h3);
  line-height: 1;
}

/* ---- Helper accesible ---- */
.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;
}

/* ---- Foco de teclado siempre visible (anillo ambar de 3px) ---- */
:focus-visible {
  outline: 3px solid var(--color-amber);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---- Respetar prefers-reduced-motion ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}