/**
 * Accessibility Enhancements for SEBI Compliance
 * Marwadi Chandarana Group
 * Based on WCAG 2.1 Level AA Standards
 * Version: 1.0
 * Date: September 2025
 */

/* ========================================
   SKIP NAVIGATION LINKS
   ======================================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000000;
    color: #ffffff;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 10000;
    font-weight: bold;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #ffffff;
    outline-offset: 2px;
}

/* ========================================
   FOCUS INDICATORS
   ======================================== */

/* Clear focus indicators for all interactive elements */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
[tabindex]:focus {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
}

/* Enhanced focus for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.2);
}

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

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

/* Updated color palette for WCAG AA compliance */
:root {
    --primary-color: #0056b3;        /* Contrast ratio: 7.45:1 */
    --primary-hover: #004494;        /* Contrast ratio: 9.73:1 */
    --secondary-color: #5a6268;      /* Contrast ratio: 7.52:1 */
    --text-color: #212529;           /* Contrast ratio: 16.1:1 */
    --text-gray: #495057;            /* Contrast ratio: 9.95:1 */
    --link-color: #0056b3;
    --link-hover: #004494;
    --error-color: #c82333;          /* Contrast ratio: 7.26:1 */
    --success-color: #218838;        /* Contrast ratio: 5.39:1 */
    --warning-color: #856404;        /* Contrast ratio: 5.51:1 */
    --background-light: #ffffff;
    --background-gray: #f8f9fa;
}

/* Apply updated colors */
body {
    color: var(--text-color);
    font-size: 16px;
    line-height: 1.5;
}

a {
    color: var(--link-color);
}

a:hover {
    color: var(--link-hover);
}

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

.sr-only,
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only-focusable:focus,
.visually-hidden-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ========================================
   RESPONSIVE TEXT AND REFLOW
   ======================================== */

/* Use relative units for font sizes */
html {
    font-size: 100%; /* 16px base */
}

body {
    font-size: 1rem;
    line-height: 1.5;
}

h1 { font-size: 2.5rem; }   /* 40px */
h2 { font-size: 2rem; }     /* 32px */
h3 { font-size: 1.75rem; }  /* 28px */
h4 { font-size: 1.5rem; }   /* 24px */
h5 { font-size: 1.25rem; }  /* 20px */
h6 { font-size: 1rem; }     /* 16px */

/* Ensure text can be resized up to 200% */
@media screen and (min-width: 1280px) {
    html {
        font-size: 100%;
    }
}

/* Support for user text spacing preferences */
* {
    line-height: inherit;
}

p, li, td, th {
    line-height: 1.5;
}

/* ========================================
   TOUCH TARGET SIZE (Minimum 44x44px)
   ======================================== */

button,
a,
input[type="submit"],
input[type="button"],
input[type="reset"],
input[type="checkbox"],
input[type="radio"],
select {
    min-height: 44px;
    min-width: 44px;
}

/* For inline links, ensure adequate padding */
a {
    padding: 2px 0;
}

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

/* Required field indicator */
.required,
[required]::after,
[aria-required="true"]::after {
    color: var(--error-color);
}

/* Form labels */
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

/* Form inputs */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ced4da;
    border-radius: 4px;
    font-size: 1rem;
    line-height: 1.5;
    transition: border-color 0.15s ease-in-out;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary-color);
    outline: 3px solid rgba(0, 102, 204, 0.25);
    outline-offset: 0;
}

/* Error states */
input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
    border-color: var(--error-color);
}

input[aria-invalid="true"]:focus,
select[aria-invalid="true"]:focus,
textarea[aria-invalid="true"]:focus {
    outline-color: rgba(200, 35, 51, 0.25);
}

/* Error messages */
.error-message,
[role="alert"] {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

/* Success messages */
.success-message,
[role="status"] {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

/* ========================================
   TABLES
   ======================================== */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

table caption {
    font-weight: bold;
    text-align: left;
    padding: 0.75rem;
    caption-side: top;
}

th,
td {
    padding: 0.75rem;
    border: 1px solid #dee2e6;
    text-align: left;
}

th {
    background-color: var(--primary-color);
    color: #ffffff;
    font-weight: 600;
}

/* Zebra striping for better readability */
tbody tr:nth-child(odd) {
    background-color: #ffffff;
}

tbody tr:nth-child(even) {
    background-color: var(--background-gray);
}

/* Responsive tables */
@media (max-width: 768px) {
    table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* ========================================
   LANDMARKS AND REGIONS
   ======================================== */

/* Visual distinction for main content */
main {
    min-height: 400px;
}

/* Ensure landmarks are properly identified */
header[role="banner"],
nav[role="navigation"],
main[role="main"],
aside[role="complementary"],
footer[role="contentinfo"] {
    display: block;
}

/* ========================================
   MODAL DIALOGS
   ======================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: 9999;
    overflow: auto;
}

.modal[aria-hidden="false"] {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-dialog {
    background: #ffffff;
    border-radius: 8px;
    max-width: 600px;
    width: 90%;
    padding: 2rem;
    position: relative;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.modal-title {
    font-size: 1.5rem;
    margin: 0;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    min-width: 44px;
    min-height: 44px;
}

.modal-close:hover {
    background-color: var(--background-gray);
    border-radius: 4px;
}

/* ========================================
   BUTTONS
   ======================================== */

button,
.button,
input[type="submit"],
input[type="button"],
input[type="reset"] {
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.15s ease-in-out;
    min-height: 44px;
}

button:hover,
.button:hover,
input[type="submit"]:hover,
input[type="button"]:hover {
    background-color: var(--primary-hover);
}

button:disabled,
.button:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
    opacity: 0.65;
}

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

[role="status"],
[role="alert"],
[aria-live] {
    position: relative;
}

/* ========================================
   HIGH CONTRAST MODE SUPPORT
   ======================================== */

@media (prefers-contrast: high) {
    :root {
        --primary-color: #0033cc;
        --primary-hover: #002299;
        --text-color: #000000;
        --text-gray: #333333;
    }
    
    a {
        text-decoration: underline;
        text-decoration-thickness: 2px;
    }
    
    button,
    input,
    select,
    textarea {
        border-width: 2px;
    }
}

/* ========================================
   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;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .skip-link,
    .modal,
    nav {
        display: none !important;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
    
    a[href^="#"]::after,
    a[href^="javascript:"]::after {
        content: "";
    }
}

/* ========================================
   DARK MODE SUPPORT (Future Enhancement)
   ======================================== */

@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here in future */
}

/* ========================================
   RESPONSIVE BREAKPOINTS
   ======================================== */

/* Mobile devices (320px - 767px) */
@media (max-width: 767px) {
    html {
        font-size: 100%;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .modal-dialog {
        width: 95%;
        padding: 1rem;
    }
}

/* Tablets (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    html {
        font-size: 100%;
    }
}

/* Desktop (1024px and above) */
@media (min-width: 1024px) {
    html {
        font-size: 100%;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Spacing utilities */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* Text utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-weight-bold { font-weight: 700; }
.font-weight-normal { font-weight: 400; }

/* Display utilities */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }

/* Accessibility utilities */
.keyboard-focus-only:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* ========================================
   COMPONENT: Accessible Alerts
   ======================================== */

.alert {
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 4px;
    position: relative;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-error,
.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

.alert-info {
    color: #004085;
    background-color: #cce5ff;
    border-color: #b8daff;
}

/* ========================================
   COMPONENT: Breadcrumbs
   ======================================== */

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    list-style: none;
    background-color: var(--background-gray);
    border-radius: 4px;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    padding: 0 0.5rem;
    color: var(--text-gray);
}

.breadcrumb-item.active {
    color: var(--text-gray);
}

/* ========================================
   ISL VIDEO PLAYER ENHANCEMENTS
   ======================================== */

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    margin-bottom: 1rem;
}

.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-controls {
    margin-top: 0.5rem;
}

.video-transcript {
    margin-top: 1rem;
}

.transcript-content {
    padding: 1rem;
    background-color: var(--background-gray);
    border-left: 4px solid var(--primary-color);
    margin-top: 0.5rem;
}

/* ========================================
   END OF ACCESSIBILITY STYLES
   ======================================== */