/* 
 * Accessibility Enhancements
 * Focus on keyboard navigation and screen reader support
 */

/* ================================================================
   FOCUS STYLES - Visible focus indicators for keyboard navigation
   ================================================================ */

/* Global focus ring for interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid #3b82f6 !important;
    outline-offset: 2px !important;
    border-radius: 4px;
}

/* Remove default focus for mouse users, keep for keyboard */
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) {
    outline: none;
}

/* Card focus states */
.card:focus-visible,
.stat:focus-visible,
.nav-card:focus-visible {
    outline: 2px solid #3b82f6 !important;
    outline-offset: 4px !important;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2) !important;
}

/* Table row focus */
tr:focus-visible {
    outline: 2px solid #3b82f6 !important;
    outline-offset: -2px !important;
    background: rgba(59, 130, 246, 0.1) !important;
}

/* Dropdown menu focus */
.dropdown-content li:focus-visible,
.menu li:focus-visible {
    outline: 2px solid #3b82f6 !important;
    outline-offset: -2px !important;
    background: rgba(59, 130, 246, 0.1) !important;
}

/* ================================================================
   SKIP LINK - Allow keyboard users to skip to main content
   ================================================================ */

.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 0.5rem 0.5rem;
    font-weight: 600;
    z-index: 10001;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 0;
}

/* ================================================================
   SCREEN READER ONLY - Hide visually but keep accessible
   ================================================================ */

.sr-only {
    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;
}

/* Show on focus for skip links */
.sr-only-focusable:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: inherit !important;
    margin: inherit !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
}

/* ================================================================
   REDUCED MOTION - Respect user preferences
   ================================================================ */

@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;
    }
}

/* ================================================================
   HIGH CONTRAST MODE - Better visibility
   ================================================================ */

@media (prefers-contrast: high) {
    /* Increase border visibility */
    .card,
    .btn,
    input,
    select,
    table,
    th,
    td {
        border: 2px solid currentColor !important;
    }

    /* Stronger focus indicators */
    *:focus-visible {
        outline-width: 3px !important;
    }
}

/* ================================================================
   LINK ACCESSIBILITY - Clear link indication
   ================================================================ */

/* Underline links in content areas */
.prose a,
article a,
main p a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Remove underline on hover for visual feedback */
.prose a:hover,
article a:hover,
main p a:hover {
    text-decoration: none;
}

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

/* Required field indicator */
label.required::after {
    content: " *";
    color: #dc2626;
}

/* Error state for inputs */
input:invalid,
select:invalid,
textarea:invalid {
    border-color: #dc2626 !important;
}

input:invalid:focus,
select:invalid:focus,
textarea:invalid:focus {
    outline-color: #dc2626 !important;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.2) !important;
}

/* Disabled state */
input:disabled,
select:disabled,
textarea:disabled,
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ================================================================
   TOUCH TARGETS - Minimum 44x44px for mobile
   ================================================================ */

@media (pointer: coarse) {
    button,
    a,
    input[type="checkbox"],
    input[type="radio"],
    select {
        min-height: 44px;
        min-width: 44px;
    }
}