/* ========================================
   WCAG 2.1.1, 2.4.3, 2.4.7 - Keyboard Navigation
   ======================================== */

/* Skip Link - WCAG 2.4.1 */
.skip-link {
    position: absolute;
    top: -100px;
    right: 10px;
    left: auto;
    /* RTL adjustment */
    z-index: 9999;
    padding: 1rem 2rem;
    min-height: 48px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: top 0.3s;
    box-shadow: var(--shadow-lg);
}

.skip-link:focus {
    top: 10px;
    outline: 3px solid white;
    outline-offset: 2px;
}

/* Enhanced Focus Indicators - WCAG 2.4.7 (AA) */
*:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* Remove default outline */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Focus visible for keyboard users */
*:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Button focus states */
.btn:focus-visible,
.action-btn:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px var(--primary-light);
}

/* Form control focus - enhanced */
.form-control:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 0;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* Link focus */
a:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    text-decoration: underline;
    text-decoration-thickness: 2px;
}

/* Card/Interactive element focus */
.card:focus-within,
.request-card:focus-within {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px var(--primary-light);
}

/* Tab focus */
.tab:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* Popover/Modal focus trap */
.popover:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* Mobile nav focus */
.mobile-nav-item:focus-visible {
    outline: 3px solid var(--primary);
    background: var(--primary-light);
}

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

/* Focus within table rows */
tr:focus-within {
    background: var(--primary-light);
    outline: 2px solid var(--primary);
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .skip-link {
        transition: none;
    }

    *:focus,
    *:focus-visible {
        transition: none !important;
        animation: none !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    *:focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }

    .btn:focus-visible,
    .action-btn:focus-visible {
        outline-width: 4px;
        box-shadow: 0 0 0 8px var(--primary-light);
    }
}