/* StudiHub - EAA & WCAG 2.1 AA Accessibility Enhancements */

/* 1. Link di Salto per Tastiera (Skip Link) */
.skip-link {
    position: absolute;
    top: -100px;
    left: 10px;
    background: #0d6efd;
    color: #ffffff !important;
    padding: 10px 18px;
    z-index: 9999;
    border-radius: 0 0 8px 8px;
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
    transition: top 0.2s ease-in-out;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #ffc107;
    outline-offset: 2px;
}

/* 2. Indicatore di Focus ad Alto Contrasto (WCAG 2.4.7 / WCAG 2.4.11) */
:focus-visible {
    outline: 3px solid #0d6efd !important;
    outline-offset: 3px !important;
    box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.25) !important;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid #0056b3 !important;
    outline-offset: 2px !important;
}

/* 3. Rimozione outline solo quando non è navigazione da tastiera */
:focus:not(:focus-visible) {
    outline: none !important;
    box-shadow: none !important;
}

/* 4. Supporto a Prefers-Reduced-Motion (WCAG 2.3.3) */
@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;
    }
}

/* 5. Utilità Accessibilità Visiva */
.visually-hidden-focusable:not(:focus):not(:focus-within) {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Requisiti Minimi di Target Touch / Click (WCAG 2.5.5 - 44x44px) */
.btn-accessible-target {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Stili per Main Content Target quando riceve il focus dallo Skip Link */
#main-content:focus {
    outline: none !important;
}