/* ===========================
   Accessibility Enhancements
   WCAG 2.1 AA Compliance
   =========================== */

/* Screen reader only utility class */
.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;
}

/* Skip link for keyboard navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background-color: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    z-index: 100;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--color-primary-dark);
    outline-offset: 2px;
}

/* Focus indicators for all interactive elements */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus,
[tabindex]:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Enhanced focus for buttons */
.btn:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Focus visible (modern browsers) */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* Ensure sufficient color contrast */
/* All text colors defined in main.css meet WCAG AA standards */

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #0000ff;
        --color-text: #000000;
        --color-bg: #ffffff;
        --color-border: #000000;
    }

    .btn {
        border: 2px solid currentColor;
    }
}

/* Reduced motion support */
@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;
    }
}

/* Dark mode support (optional, respects user preference) */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f1f5f9;
        --color-text-light: #94a3b8;
        --color-bg: #0f172a;
        --color-bg-alt: #1e293b;
        --color-border: #334155;
    }
}

/* Touch target size enforcement (44x44px minimum) */
a,
button,
input[type="button"],
input[type="submit"],
input[type="reset"],
[role="button"] {
    min-height: 44px;
    min-width: 44px;
}

/* Ensure links are distinguishable from regular text */
a {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

/* Button hover and active states for accessibility */
.btn:hover {
    cursor: pointer;
}

.btn:active {
    transform: translateY(0);
}

/* Disabled state styling */
.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Error and success message accessibility */
[role="alert"] {
    padding: var(--space-sm);
    border-radius: 0.5rem;
    margin-bottom: var(--space-sm);
}

.error {
    background-color: #fef2f2;
    border: 2px solid #ef4444;
    color: #991b1b;
}

.success {
    background-color: #f0fdf4;
    border: 2px solid #22c55e;
    color: #166534;
}

/* Ensure headings have proper hierarchy */
/* Enforced semantically in HTML, styles support visual hierarchy */