/*
 * @file: accessibility.css
 * @description: Stili specifici per migliorare l'accessibilità del sito UCOI/UCOIM
 * @author: Altoprofilo Studio
 * @last-updated: 2025-05-06
 */

/* ==========================================================================
   SKIP LINK
   ========================================================================== */
/* Permette agli utenti che usano la tastiera o screen reader di saltare al contenuto principale */
.skip-link {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  left: 50%;
  padding: 10px 20px;
  position: absolute;
  transform: translateX(-50%) translateY(-110%);
  transition: var(--transition-normal);
  z-index: 1000;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
}

.skip-link:focus {
  transform: translateX(-50%) translateY(0);
  outline: 2px solid white;
  outline-offset: 4px;
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   SCREEN READER ONLY
   ========================================================================== */
/* Nasconde elementi visivamente ma li mantiene accessibili per screen reader */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   STATI FOCUS
   ========================================================================== */
/* Stili di focus migliorati per una migliore accessibilità da tastiera */

/* Stile focus base per tutti gli elementi interattivi */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
.tag:focus,
.category-link:focus,
.pagination-btn:focus,
.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Stile aggiuntivo per i bottoni */
.btn:focus {
  box-shadow: var(--focus-ring);
}

/* Stile aggiuntivo per form controls */
input:focus,
select:focus,
textarea:focus {
  box-shadow: var(--focus-ring);
  outline-offset: 0;
}

/* Focus su contenitori interattivi */
.news-card:focus-within {
  box-shadow: var(--shadow-lg);
  outline: 2px solid var(--primary-color);
  outline-offset: 4px;
}

/* ==========================================================================
   FOCUS VISIBLE
   ========================================================================== */
/* Rimuove outline per input con mouse, mantiene per tastiera */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
textarea:focus:not(:focus-visible),
.btn:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
  text-decoration: none;
}

/* ==========================================================================
   COMPONENTI UI ACCESSIBILI
   ========================================================================== */
/* Stile per icona refresh nella barra dei filtri */
.filter-action-btn {
  background: none;
  border: none;
  color: var(--primary-color);
  cursor: pointer;
  padding: 8px;
  border-radius: 4px;
  transition: var(--transition-fast);
}

.filter-action-btn:hover {
  background-color: rgba(0, 51, 102, 0.1);
  transform: var(--hover-lift-small);
}

.filter-action-btn:active {
  background-color: rgba(0, 51, 102, 0.2);
}

.filter-action-btn i {
  vertical-align: middle;
  margin-right: 4px;
}

/* Stile consistente per link di azione accessibili */
.clear-filter-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-fast);
}

.clear-filter-btn:hover {
  color: var(--primary-color);
  background-color: rgba(0, 0, 0, 0.05);
  transform: var(--hover-lift-small);
}

.clear-filter-btn:active {
  background-color: rgba(0, 0, 0, 0.1);
}

/* ==========================================================================
   CONTRASTO ELEVATO
   Supporto per la preferenza utente di contrasto elevato
   ========================================================================== */
@media (prefers-contrast: more) {
  /* Aumenta il contrasto per i testi */
  body {
    color: #000;
    background-color: #fff;
  }
  
  /* Aumenta il contrasto per i link */
  a {
    color: #00009f;
    text-decoration: underline;
    text-decoration-thickness: 2px;
  }
  
  a:hover, a:focus {
    color: #900000;
    text-decoration-thickness: 3px;
  }
  
  /* Contrasto per bottoni */
  .btn, button {
    border: 2px solid currentColor;
  }
  
  .btn-primary, .btn-secondary {
    color: #fff;
    background-color: #000;
    border-color: #000;
  }
  
  .btn-ghost {
    color: #000;
    border-color: #000;
  }
  
  /* Contrasto per bordi e outline */
  input, select, textarea {
    border: 2px solid #000;
  }
  
  *:focus {
    outline: 3px solid #000;
    outline-offset: 2px;
  }
  
  /* Badge e tag con contrasto elevato */
  .badge-appartenenza, .tag {
    border: 2px solid currentColor;
  }
  
  .badge-ucoi {
    background-color: #000066;
  }
  
  .badge-ucoim {
    background-color: #003366;
  }
  
  .badge-entrambe {
    background-color: #660000;
  }
}

/* ==========================================================================
   ACCESSIBILITY.CSS - Aggiunte per Loading Spinner
   Aggiungere queste regole al file esistente /css/accessibility.css
   ========================================================================== */

/* Loading Spinner - Visual Indicator
   ========================================================================== */

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem 1rem;
  min-height: 300px;
}

.spinner-icon {
  display: inline-block;
  width: 48px;
  height: 48px;
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-top-color: #1a73e8; /* Colore primario UCOI/UCOIM */
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { 
    transform: rotate(360deg); 
  }
}

/* Rispetta le preferenze di movimento ridotto */
@media (prefers-reduced-motion: reduce) {
  .spinner-icon {
    animation: spin 2s linear infinite; /* Rallenta */
  }
}

/* Dark mode support (se implementato) */
@media (prefers-color-scheme: dark) {
  .spinner-icon {
    border-color: rgba(255, 255, 255, 0.1);
    border-top-color: #4285f4;
  }
}

/* States per quando il contenuto viene caricato */
.loading-spinner.hidden {
  display: none;
}

/* Alternative: Spinner con punti pulsanti */
.spinner-dots {
  display: flex;
  gap: 0.5rem;
  padding: 2rem;
  justify-content: center;
}

.spinner-dots span {
  width: 12px;
  height: 12px;
  background-color: #1a73e8;
  border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite;
}

.spinner-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.spinner-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes pulse {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Skip Links Enhancement
   ========================================================================== */

.skip-link:not(:focus) {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10000;
  padding: 1rem 1.5rem;
  background-color: #1a73e8;
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0 0 0.5rem 0;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

.skip-link:focus:hover {
  background-color: #1557b0;
}

/* Multiple skip links stacking */
.skip-link:focus + .skip-link:not(:focus) {
  top: 3.5rem; /* Stack below the first */
}

/* Screen Reader Only Utility
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* SR Announcer Live Region
   ========================================================================== */

#sr-announcer {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Focus Visible Enhancement
   ========================================================================== */

/* Remove default outline for mouse users, keep for keyboard */
*:focus:not(:focus-visible) {
  outline: none;
}

*:focus-visible {
  outline: 3px solid #1a73e8;
  outline-offset: 2px;
  border-radius: 2px;
}

/* High Contrast Mode Support
   ========================================================================== */

@media (prefers-contrast: high) {
  .spinner-icon {
    border-width: 5px;
    border-top-color: currentColor;
  }
  
  .skip-link:focus {
    outline-width: 4px;
    outline-color: currentColor;
  }
}

/* Print Styles - Hide Spinners
   ========================================================================== */

@media print {
  .loading-spinner,
  .spinner-icon,
  .spinner-dots,
  .skip-link {
    display: none !important;
  }
}