/**
 * Accessibility CSS - EAA / WCAG 2.1 AA Compliance
 * Formazione Docenti - ASPIC Psicologia Marche
 */

/* ===== Skip Link ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    z-index: 9999;
    padding: 0.75rem 1.5rem;
    background-color: #2B6CB0;
    color: #ffffff;
    font-weight: 600;
    font-size: 0.875rem;
    text-decoration: none;
    border-radius: 0 0 0.375rem 0;
    transition: top 0.15s ease;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #fbbf24;
    outline-offset: 2px;
}

/* ===== Focus Visible ===== */
:focus-visible {
    outline: 3px solid #2B6CB0;
    outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid #2B6CB0;
    outline-offset: 2px;
}

/* Remove outline for mouse clicks but keep for keyboard */
:focus:not(:focus-visible) {
    outline: none;
}

/* ===== Touch Targets (minimum 44x44px) ===== */
/* Standalone interactive elements: 44px touch target */
.nav-link,
.dropdown-item,
.btn,
a[role="button"] {
    min-height: 44px;
    min-width: 44px;
}

/* Checkbox/radio: visual size normale, area cliccabile via label */
.form-check {
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
    margin: 0;
}

/* Bottoni inline in input-group: seguono altezza input, no 44px */
.input-group .input-group-text button,
.input-group button {
    min-height: auto;
    min-width: auto;
}

/* ===== High Contrast Mode ===== */
@media (prefers-contrast: more) {
    :root {
        --fd-primary: #1a4a7a;
    }

    .card {
        border-width: 2px;
        border-color: #333;
    }

    .nav-link {
        text-decoration: underline;
    }

    .btn-primary {
        background-color: #1a4a7a;
        border: 2px solid #000;
    }

    .form-control,
    .form-select {
        border-width: 2px;
        border-color: #333;
    }

    .text-secondary,
    .text-muted {
        color: #333 !important;
    }
}

/* ===== Forced Colors (Windows High Contrast) ===== */
@media (forced-colors: active) {
    .btn {
        border: 2px solid ButtonText;
    }

    .card {
        border: 2px solid CanvasText;
    }

    .nav-link.active {
        border-bottom: 3px solid Highlight;
    }

    .badge {
        border: 1px solid CanvasText;
    }
}

/* ===== Reduced Motion ===== */
@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;
    }

    .skip-link {
        transition: none;
    }
}

/* ===== Screen Reader Only ===== */
.sr-only,
.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;
}

.sr-only-focusable:focus,
.visually-hidden-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ===== Form Accessibility ===== */
.form-control[aria-invalid="true"],
.form-select[aria-invalid="true"] {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.15);
}

.form-control[aria-invalid="true"]:focus,
.form-select[aria-invalid="true"]:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25);
}

.invalid-feedback {
    font-size: 0.8125rem;
    color: #dc3545;
    margin-top: 0.25rem;
}

/* Required field indicator */
.form-label .required,
.form-label[aria-required]::after {
    color: #dc3545;
    content: " *";
}

/* ===== Link Accessibility ===== */
a:not(.btn):not(.nav-link):not(.dropdown-item) {
    text-decoration: underline;
    text-underline-offset: 2px;
}

a:not(.btn):not(.nav-link):not(.dropdown-item):hover {
    text-decoration-thickness: 2px;
}

/* ===== Table Accessibility ===== */
.table th {
    font-weight: 600;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02);
}

/* ===== Alert roles ===== */
[role="alert"] {
    padding: 0.75rem 1rem;
}

/* ===== Selection Color ===== */
::selection {
    background-color: rgba(43, 108, 176, 0.2);
    color: inherit;
}