/* ==========================================
   COMPLETE CSS-ONLY ACCESSIBILITY
   No JavaScript Required - Works with HTML5 and CSS only
========================================== */

/* ==========================================
   SKIP LINKS (CSS-Only Implementation) - DISABLED - NOT YET FUNCTIONAL
========================================== */

/*.skip-links {
    position: fixed;
    top: var(--header-height, 64px);
    left: 0;
    z-index: 100001;
}

.skip-link {
    position: absolute;
    left: -9999px;
    background: var(--primary-color, #0d6efd);
    color: white;
    padding: 8px 12px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    width: var(--sidebar-width, 220px);
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

    .skip-link:focus {
        left: 0;
        top: 0;
        outline: none;
        box-shadow: inset 0 0 0 3px white, 0 2px 8px rgba(0, 0, 0, 0.2);
        color: white;
        text-decoration: none;
    }*/

/* Stack them vertically */
/*.skip-links .skip-link:nth-child(1):focus {
    top: 6px;
}

.skip-links .skip-link:nth-child(2):focus {
    top: 46px;
}

.skip-links .skip-link:nth-child(3):focus {
    top: 86px;
}*/

/* ==========================================
   COMPREHENSIVE FOCUS MANAGEMENT
========================================== */

/* Base focus styles for all interactive elements */
:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
}

/* Hide outline for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}

/* Firefox fallback */
:-moz-focusring {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
}

/* ==========================================
   BUTTON FOCUS STYLES (ALL VARIANTS)
========================================== */

/* Primary buttons */
.btn-primary:focus {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.25), 0 4px 8px rgba(0, 0, 0, 0.15);
    filter: brightness(110%);
}

/* Outline primary buttons */
.btn-outline-primary:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.25), 0 2px 4px rgba(0, 0, 0, 0.1);
    background-color: var(--primary-color-lighter);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Danger buttons */
.btn-danger:focus-visible {
    outline: 3px solid #dc3545;
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25), 0 4px 8px rgba(0, 0, 0, 0.15);
    filter: brightness(110%);
}

/* Outline danger buttons */
.btn-outline-danger:focus-visible {
    outline: 3px solid #dc3545;
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25), 0 4px 8px rgba(0, 0, 0, 0.15);
    background-color: #dc3545;
    color: #fff;
}

/* Button links */
.btn-link-primary:focus-visible,
.btn-link-outline-primary:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.25);
}

/* Square buttons */
.btn-square:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.25);
}

/* Generic button fallback */
.btn:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.25);
}

/* ==========================================
   FORM CONTROL FOCUS STYLES
========================================== */

/* Form inputs */
.form-control:focus-visible {
    border-color: var(--primary-color-light, #66afe9);
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.15);
}

/* Form selects */
.form-select:focus-visible {
    border-color: var(--primary-color-light, #66afe9);
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.15);
}

/* Checkboxes and radios */
.form-check-input:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.15);
}

/* ==========================================
   NAVIGATION FOCUS STYLES
========================================== */

/* Sidebar navigation links */
.sidebar .nav-link:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    background-color: var(--primary-color-lighter, rgba(0, 95, 204, 0.1));
}

/* Sidebar logout button */
.sidebar-logout:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    background-color: var(--primary-color-lighter, rgba(0, 95, 204, 0.1));
}

/* User dropdown */
.user-dropdown:focus-visible {
    outline: 3px solid white;
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(255, 255, 255, 0.25);
}

/* Sidebar toggle */
.sidebar-toggle:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.25);
}

/* ==========================================
   MODAL FOCUS STYLES
========================================== */

/* Modal close button */
.modal-close-btn:focus-visible {
    outline: 3px solid white;
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(255, 255, 255, 0.25);
}

/* Alert close buttons */
.alert .btn-close:focus-visible {
    outline: 2px solid white;
    outline-offset: 2px;
}

/* ==========================================
   LINK FOCUS STYLES
========================================== */

/* Regular links */
a:focus-visible {
    outline: 2px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Theme links */
.theme-link-primary:focus-visible,
.theme-link-action:focus-visible {
    outline: 2px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Nav tabs */
.nav-tabs .nav-link:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.15);
}

/* Accordion buttons */
.accordion-button:focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.15);
}

/* ==========================================
   FOCUS WITHIN CONTAINERS
========================================== */

/* Enhanced focus within for form groups */
.form-group:focus-within,
.input-group:focus-within,
.card:focus-within {
    box-shadow: 0 0 0 0.25rem rgba(0, 95, 204, 0.15);
}

/* ==========================================
   FORM ACCESSIBILITY
========================================== */

/* Required field indicators */
.required-field::after {
    content: " *";
    color: var(--bs-danger, #dc3545);
    font-weight: bold;
    margin-left: 0.25rem;
}

/* Form validation states using HTML5 */
.form-control:invalid {
    border-color: var(--bs-danger, #dc3545);
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.15);
}

.form-control:valid:not(:placeholder-shown) {
    border-color: var(--bs-border-color, #dee2e6);
    box-shadow: none;
}

/* Invalid feedback styling */
.invalid-feedback {
    display: block;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    color: var(--bs-danger, #dc3545);
}

/* Valid feedback */
.valid-feedback {
    display: block;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    color: var(--bs-success, #198754);
}

/* ==========================================
   SCREEN READER UTILITIES
========================================== */

.visually-hidden,
.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;
}

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

.visually-hidden-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    padding: 0.5rem 1rem;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.25rem;
    z-index: 100000;
}

/* ==========================================
   STATUS MESSAGES & ALERTS
========================================== */

.alert {
    border-left: 4px solid;
    font-weight: 500;
}

.alert-success {
    border-left-color: var(--bs-success, #198754);
    background-color: rgba(25, 135, 84, 0.1);
}

.alert-danger {
    border-left-color: var(--bs-danger, #dc3545);
    background-color: rgba(220, 53, 69, 0.1);
}

.alert-warning {
    border-left-color: var(--bs-warning, #ffc107);
    background-color: rgba(255, 193, 7, 0.1);
}

.alert-info {
    border-left-color: var(--bs-info, #0dcaf0);
    background-color: rgba(13, 202, 240, 0.1);
}

/* ==========================================
   MOBILE ACCESSIBILITY
========================================== */

@media (max-width: 991.98px) {
    /* Larger touch targets per WCAG guidelines */
    .btn {
        min-height: 44px;
        min-width: 44px;
    }

    .form-control,
    .form-select {
        min-height: 44px;
        font-size: 16px; /* Prevents iOS zoom */
    }

    .nav-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .dropdown-item {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* Better focus indicators on mobile */
    :focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }

    /* Enhanced mobile focus for our custom components */
    .sidebar .nav-link:focus-visible,
    .sidebar-logout:focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }

    .btn:focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }
}

/* ==========================================
   HIGH CONTRAST MODE SUPPORT
========================================== */

@media (prefers-contrast: high) {
    :focus-visible {
        outline: 4px solid;
        outline-offset: 2px;
    }

    .btn {
        border: 2px solid;
    }

    .form-control,
    .form-select {
        border: 2px solid;
    }

    .alert {
        border: 2px solid;
    }

    .card {
        border: 1px solid;
    }

    /* Enhanced contrast for our custom components */
    .btn:focus-visible,
    .form-control:focus-visible,
    .form-select:focus-visible {
        outline: 4px solid;
        outline-offset: 2px;
    }

    .sidebar .nav-link:focus-visible,
    .sidebar-logout:focus-visible {
        outline: 4px solid;
        outline-offset: 2px;
    }
}

/* ==========================================
   REDUCED MOTION SUPPORT
========================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms;
        animation-iteration-count: 1;
        transition-duration: 0.01ms;
        scroll-behavior: auto;
    }

    /* Respect reduced motion for our custom transitions */
    .sidebar,
    .layout-content {
        transition: none;
    }
}

/* ==========================================
   PRINT ACCESSIBILITY
========================================== */

@media print {
    .skip-links,
    .btn-close,
    .sidebar-toggle,
    .user-dropdown {
        display: none;
    }

    :focus,
    :focus-visible {
        outline: none;
        box-shadow: none;
    }

    .alert {
        border: 2px solid black;
    }

    body {
        color: black;
        background: white;
    }

    /* Print-friendly navigation */
    .sidebar .nav-link::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* ==========================================
   FOCUS RING POLYFILL SUPPORT
   For older browsers that don't support :focus-visible
========================================== */

.js-focus-visible :focus:not(.focus-visible) {
    outline: none;
}

.js-focus-visible .focus-visible {
    outline: 3px solid var(--primary-color-dark, #005fcc);
    outline-offset: 2px;
}