/**
 * @fileoverview Accessibility Styles
 * @description WCAG 2.1 AA compliant styles including focus indicators,
 *              color contrast improvements, and screen reader utilities.
 * @author Vidya Chaitanya Samakhya
 * @version 1.0.0
 */

/* ============================================
   COLOR CONTRAST IMPROVEMENTS
   ============================================ */

/* Ensure minimum 4.5:1 contrast ratio for normal text (WCAG AA) */
/* Ensure minimum 3:1 contrast ratio for large text (WCAG AA) */

/* Text colors with improved contrast */
.text-gray-600 {
    color: #374151; /* gray-700 - 4.5:1 contrast on white */
}

.text-gray-500 {
    color: #4b5563; /* gray-600 - 4.5:1 contrast on white */
}

/* Link colors with improved contrast */
a {
    color: #1e3a8a; /* blue-800 - 4.5:1 contrast */
}

a:hover,
a:focus {
    color: #1e40af; /* blue-700 - maintains contrast */
    text-decoration: underline;
}

/* Button text contrast */
button {
    color: inherit;
}

/* Ensure sufficient contrast for buttons on colored backgrounds */
.bg-blue-800 button,
.bg-blue-700 button,
.bg-blue-900 button {
    color: #ffffff; /* white - 4.5:1 contrast */
}

.bg-amber-500 button,
.bg-amber-600 button {
    color: #ffffff; /* white - 4.5:1 contrast */
}

/* ============================================
   FOCUS INDICATORS - ENHANCED
   ============================================ */

/* High contrast focus indicators for keyboard navigation */
*:focus-visible {
    outline: 3px solid #3b82f6; /* blue-500 */
    outline-offset: 2px;
    border-radius: 2px;
}

/* Focus indicators for specific elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid #3b82f6;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

/* Focus within for containers */
.nav-link:focus-visible,
.mobile-menu-link:focus-visible {
    background-color: rgba(59, 130, 246, 0.1);
    outline: 3px solid #3b82f6;
    outline-offset: 2px;
}

/* Focus for buttons with colored backgrounds */
.bg-amber-500:focus-visible,
.bg-blue-800:focus-visible {
    outline: 3px solid #ffffff;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.3);
}

/* ============================================
   SCREEN READER ONLY
   ============================================ */

.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;
}

.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ============================================
   ARIA LIVE REGIONS
   ============================================ */

[aria-live] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   KEYBOARD NAVIGATION INDICATOR
   ============================================ */

/* Show enhanced focus only when using keyboard */
body.keyboard-navigation *:focus {
    outline: 3px solid #3b82f6;
    outline-offset: 2px;
}

body:not(.keyboard-navigation) *:focus:not(:focus-visible) {
    outline: none;
}

/* ============================================
   MODAL ACCESSIBILITY
   ============================================ */

[role="dialog"] {
    /* Ensure modals are properly announced */
}

[aria-hidden="true"] {
    /* Hide from screen readers when modal is closed */
}

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

/* Ensure form labels are visible and have sufficient contrast */
label {
    color: #111827; /* gray-900 - 4.5:1 contrast */
    font-weight: 500;
}

/* Error messages with sufficient contrast */
.error-message,
.invalid-feedback {
    color: #dc2626; /* red-600 - 4.5:1 contrast */
    font-weight: 500;
}

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

@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
   ============================================ */

@media (prefers-contrast: high) {
    * {
        border-color: currentColor;
    }
    
    a {
        text-decoration: underline;
    }
    
    button {
        border: 2px solid currentColor;
    }
}