/**
 * ============================================================================
 * ACCESIBILIDAD - Skip Link + Focus States
 * ============================================================================
 *
 * Cumple con WCAG 2.1 Nivel AA:
 * - 2.4.1 Bypass Blocks (Skip link)
 * - 2.4.7 Focus Visible (Focus indicators)
 * - 1.4.11 Non-text Contrast (Contraste de focus)
 */

/* ============================================================================
   SKIP TO CONTENT LINK
   ============================================================================
   Enlace invisible que aparece al hacer Tab. Permite saltar la navegación.
*/

.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    z-index: 100000;

    padding: 16px 24px;

    background-color: var(--color-brand);
    color: var(--color-text-inverse) !important;

    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    line-height: 1;

    border: 3px solid transparent;
    border-radius: 0 0 8px 0;

    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
    color: var(--color-text-inverse) !important;
    text-decoration: none;
}

.skip-link:hover {
    color: var(--color-text-inverse) !important;
}

/* Screen reader only */
.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute !important;
    width: 1px;
    word-wrap: normal !important;
}

.screen-reader-text:focus {
    background-color: var(--color-brand);
    border-radius: 3px;
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
    clip: auto !important;
    clip-path: none;
    color: var(--color-text-inverse);
    display: block;
    font-size: 1rem;
    font-weight: 700;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
}


/* ============================================================================
   FOCUS STATES - INDICADORES VISIBLES PARA TECLADO
   ============================================================================
   outline: none en * se elimina — delegar al :focus-visible de abajo
   es más correcto y menos destructivo.
*/

/* Focus visible para usuarios de teclado (no aparece al hacer click) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible,
[role="link"]:focus-visible,
[tabindex]:focus-visible,
summary:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
    border-radius: 4px;
    transition: outline-offset 0.1s ease;
}

/* Focus para botones con fondo */
.btn:focus-visible,
button.button:focus-visible,
input[type="submit"]:focus-visible,
input[type="button"]:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(0, 173, 238, 0.2);
}

/* Focus para enlaces dentro de texto */
p a:focus-visible,
li a:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
    background-color: rgba(0, 173, 238, 0.15);
    border-radius: 2px;
}

/* Focus para cards y enlaces de bloque */
.lc-card:focus-visible,
.featured-post:focus-visible,
.related-category-card:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 4px;
    border-radius: 12px;
}

/* Focus dentro de cards */
.lc-card a:focus-visible,
.featured-post a:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 4px;
    border-radius: 8px;
}

/* Focus para inputs y selects */
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 0;
    border-color: var(--color-brand);
    box-shadow: 0 0 0 3px rgba(0, 173, 238, 0.2);
}

/* Focus en menú de navegación */
nav a:focus-visible,
.main-navigation a:focus-visible,
.menu a:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: -3px;
    background-color: rgba(0, 173, 238, 0.1);
}


/* ============================================================================
   ACCESIBILIDAD ADICIONAL
   ============================================================================
*/

/* Indicador visual cuando se navega con teclado */
body.user-is-tabbing *:focus {
    outline: 3px solid var(--color-focus) !important;
    outline-offset: 3px !important;
}

/* Mejorar contraste de texto al hover en enlaces */
a:hover,
a:focus {
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-thickness: 2px;
}

/* Excluir hover underline en botones y cards */
.btn:hover,
.btn:focus,
.lc-card__btn:hover,
.lc-card__btn:focus,
.featured-post__btn:hover,
.featured-post__btn:focus,
.related-category-card:hover,
.related-category-card:focus {
    text-decoration: none;
}

/* Cursor pointer en elementos interactivos */
button,
[role="button"],
[type="button"],
[type="submit"] {
    cursor: pointer;
}

/* Respetar preferencia de movimiento reducido */
@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;
    }
}

/* Aumentar área táctil en móviles (mínimo 44x44px - WCAG) */
@media (max-width: 768px) {
    button,
    .btn,
    a.btn,
    input[type="submit"],
    input[type="button"],
    .lc-card__btn,
    .featured-post__btn {
        min-height: 44px;
        min-width: 44px;
    }
}


/* ============================================================================
   HIGH CONTRAST MODE (Windows High Contrast)
   ============================================================================
*/

@media (forced-colors: active) {
    .skip-link {
        border: 2px solid ButtonText;
    }

    *:focus-visible {
        outline: 3px solid Highlight !important;
    }
}