/* Accessibility Utilities */

/* Skip to main content link */
.visually-hidden-focusable {
    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;
}

.visually-hidden-focusable:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0.5rem 1rem !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
    background-color: var(--bs-primary) !important;
    color: white !important;
    text-decoration: none !important;
    z-index: 9999 !important;
    display: block !important;
    text-align: center !important;
}

/* Focus indicators */
.btn:focus,
.form-control:focus,
.form-select:focus,
.nav-link:focus,
.dropdown-item:focus,
.sidebar-toggle:focus,
.theme-toggle:focus {
    outline: 2px solid var(--bs-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn {
        border-width: 2px;
    }
    
    .nav-link {
        border-left: 3px solid transparent;
    }
    
    .nav-link.active,
    .nav-link[aria-current="page"] {
        border-left-color: var(--bs-primary);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .collapse {
        transition: none;
    }
    
    .fade {
        transition: none;
    }
    
    .modal.fade .modal-dialog {
        transition: none;
    }
    
    .toast {
        transition: none;
    }
}

/* Screen reader only content */
.sr-only,
.visually-hidden {
    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;
}

/* Ensure sufficient color contrast for links */
a:not(.btn):not(.nav-link):not(.dropdown-item) {
    text-decoration: underline;
}

a:not(.btn):not(.nav-link):not(.dropdown-item):hover,
a:not(.btn):not(.nav-link):not(.dropdown-item):focus {
    text-decoration: none;
}

/* Improve form error visibility */
.invalid-feedback {
    font-weight: 500;
}

.form-control.is-invalid,
.form-select.is-invalid {
    border-width: 2px;
}

/* Loading states */
[aria-busy="true"] {
    cursor: wait;
}

/* Live regions */
[aria-live] {
    position: relative;
}

/* Ensure interactive elements have minimum size */
.btn,
.nav-link,
.dropdown-item,
button {
    min-height: 44px;
    min-width: 44px;
}

/* Table accessibility */
.table th[scope] {
    font-weight: 600;
}

.table-responsive {
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
}

.table-responsive:focus {
    outline: 2px solid var(--bs-primary);
    outline-offset: 2px;
}

/* Modal accessibility */
.modal-backdrop {
    background-color: rgba(0, 0, 0, 0.75);
}

/* Toast accessibility */
.toast {
    border: 1px solid var(--bs-border-color);
}

.toast-header {
    font-weight: 600;
}

/* Navigation accessibility */
.nav-group-toggle[aria-expanded="true"] .toggle-icon {
    transform: rotate(90deg);
}

.nav-group-toggle[aria-expanded="false"] .toggle-icon {
    transform: rotate(0deg);
}

/* Theme toggle accessibility */
.theme-toggle[aria-pressed="true"] {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: white;
}

/* Chart accessibility */
.chart-area canvas {
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
}

.chart-area canvas:focus {
    outline: 2px solid var(--bs-primary);
    outline-offset: 2px;
}

/* Form fieldset styling */
fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

fieldset legend {
    font-weight: 600;
    margin-bottom: 1rem;
}

/* Ensure proper heading hierarchy styling */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
}

/* Status indicators */
[aria-current="page"] {
    font-weight: 600;
}

/* Loading spinner accessibility */
.loading-spinner {
    width: 2rem;
    height: 2rem;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

@keyframes spinner-border {
    to {
        transform: rotate(360deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .loading-spinner {
        animation: none;
        border-right-color: currentColor;
    }
}