/**
 * Accessibility Stylesheet (WCAG 2.1/2.2 AA & AAA Compliant)
 * Online Multi-Tenant Bible (Malayalam, Tamil, Telugu, Kannada, Hindi)
 */

:root {
    --a11y-font-scale: 1.0;
    --a11y-line-height: 1.8;
    --a11y-letter-spacing: normal;
    --a11y-word-spacing: normal;
    --a11y-focus-outline: 3px solid #0056b3;
    --a11y-focus-offset: 3px;
}

/* ==========================================================================
   1. Universal Focus Visibility (WCAG 2.4.7 Focus Visible)
   ========================================================================== */
*:focus-visible {
    outline: var(--a11y-focus-outline) !important;
    outline-offset: var(--a11y-focus-offset) !important;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: var(--a11y-focus-outline) !important;
    outline-offset: var(--a11y-focus-offset) !important;
}

/* ==========================================================================
   2. Skip Navigation Links (WCAG 2.4.1 Bypass Blocks)
   ========================================================================== */
.skip-nav {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 100000;
    width: 100%;
    pointer-events: none;
}

.skip-link {
    position: absolute;
    top: -9999px;
    left: 50%;
    transform: translateX(-50%);
    background: #000000 !important;
    color: #ffff00 !important;
    font-size: 1.15rem !important;
    font-weight: 700 !important;
    padding: 14px 24px !important;
    border: 3px solid #ffff00 !important;
    border-radius: 0 0 10px 10px !important;
    text-decoration: underline !important;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.75) !important;
    pointer-events: auto;
    white-space: nowrap;
    z-index: 100001;
}

.skip-link:focus,
.skip-link:focus-visible {
    top: 0 !important;
    outline: 4px solid #ffffff !important;
    outline-offset: 2px !important;
}

/* Screen reader only utility (WCAG compliant) */
.visually-hidden {
    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;
}

/* ==========================================================================
   3. Accessibility Options Toolbar
   ========================================================================== */
.a11y-toolbar-container {
    background-color: #212529;
    color: #ffffff;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    padding: 0.5rem 0.75rem;
    border: 2px solid #495057;
}

.a11y-toolbar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.a11y-toolbar-title {
    font-size: 0.95rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: #ffdc75;
}

.a11y-btn-group {
    display: inline-flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.a11y-btn {
    background-color: #343a40;
    color: #ffffff;
    border: 1px solid #6c757d;
    padding: 0.3rem 0.65rem;
    font-size: 0.85rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.15s, color 0.15s, border-color 0.15s;
    min-height: 36px;
    min-width: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.a11y-btn:hover {
    background-color: #495057;
    color: #ffdc75;
    border-color: #ffdc75;
}

.a11y-btn[aria-pressed="true"],
.a11y-btn.active {
    background-color: #ffdc75;
    color: #000000;
    border-color: #ffffff;
    box-shadow: 0 0 0 2px rgba(255, 220, 117, 0.5);
}

.a11y-panel {
    background-color: #1a1e21;
    border-top: 1px solid #495057;
    padding: 0.75rem;
    margin-top: 0.5rem;
    border-radius: 4px;
}

/* ==========================================================================
   4. High-Contrast Accessible Themes (WCAG 1.4.3 & 1.4.6)
   ========================================================================== */

/* Default Theme Fixes for High Contrast (AA/AAA Compliant) */
body {
    font-size: calc(1rem * var(--a11y-font-scale));
    line-height: var(--a11y-line-height);
    letter-spacing: var(--a11y-letter-spacing);
    word-spacing: var(--a11y-word-spacing);
}

.top-navbar {
    background-color: #1b5e20 !important; /* WCAG AAA compliant deep green */
    border-bottom: 4px solid #f57f17 !important;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25) !important;
}

.top-navbar .navbar-brand,
.top-navbar .nav-link {
    color: #ffffff !important;
    font-weight: 600;
    text-shadow: none !important;
}

.top-navbar .nav-link:hover,
.top-navbar .nav-link:focus {
    color: #ffeb3b !important;
    text-decoration: underline;
}

.breadcrumb-item a {
    color: #1b5e20 !important;
    font-weight: 600;
}

.breadcrumb-item a:hover,
.breadcrumb-item a:focus {
    color: #0d3810 !important;
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: #5c3a21 !important;
    font-weight: bold;
}

/* Theme: High Contrast Dark Mode */
[data-a11y-theme="high-contrast-dark"] body {
    background-color: #121212 !important;
    color: #f5f5f5 !important;
}

[data-a11y-theme="high-contrast-dark"] .main-reading-area,
[data-a11y-theme="high-contrast-dark"] .sidebar-container,
[data-a11y-theme="high-contrast-dark"] .breadcrumb-container,
[data-a11y-theme="high-contrast-dark"] .jump-section,
[data-a11y-theme="high-contrast-dark"] .accordion-item,
[data-a11y-theme="high-contrast-dark"] .custom-footer {
    background-color: #1e1e1e !important;
    color: #f5f5f5 !important;
    border-color: #424242 !important;
}

[data-a11y-theme="high-contrast-dark"] .top-navbar {
    background-color: #000000 !important;
    border-bottom: 4px solid #ffeb3b !important;
}

[data-a11y-theme="high-contrast-dark"] h1,
[data-a11y-theme="high-contrast-dark"] h2,
[data-a11y-theme="high-contrast-dark"] h3,
[data-a11y-theme="high-contrast-dark"] h4,
[data-a11y-theme="high-contrast-dark"] h5 {
    color: #ffeb3b !important;
}

[data-a11y-theme="high-contrast-dark"] a {
    color: #90caf9 !important;
}

[data-a11y-theme="high-contrast-dark"] a:hover,
[data-a11y-theme="high-contrast-dark"] a:focus {
    color: #ffffff !important;
}

[data-a11y-theme="high-contrast-dark"] .line-by-line p,
[data-a11y-theme="high-contrast-dark"] .verse-item {
    color: #ffffff !important;
    border-bottom: 1px solid #333333 !important;
}

[data-a11y-theme="high-contrast-dark"] .accordion-button {
    background-color: #242424 !important;
    color: #ffffff !important;
}

[data-a11y-theme="high-contrast-dark"] .accordion-button:not(.collapsed) {
    background-color: #333333 !important;
    color: #ffeb3b !important;
}

[data-a11y-theme="high-contrast-dark"] .sidebar-links a {
    color: #90caf9 !important;
    border-bottom: 1px solid #333333 !important;
}

[data-a11y-theme="high-contrast-dark"] .sidebar-links a:hover {
    color: #ffeb3b !important;
    background-color: #2a2a2a !important;
}

[data-a11y-theme="high-contrast-dark"] *:focus-visible {
    outline: 3px solid #ffeb3b !important;
}

/* Theme: Yellow on Black (Gold standard for low vision) */
[data-a11y-theme="yellow-on-black"] body {
    background-color: #000000 !important;
    color: #ffff00 !important;
}

[data-a11y-theme="yellow-on-black"] .main-reading-area,
[data-a11y-theme="yellow-on-black"] .sidebar-container,
[data-a11y-theme="yellow-on-black"] .breadcrumb-container,
[data-a11y-theme="yellow-on-black"] .jump-section,
[data-a11y-theme="yellow-on-black"] .accordion-item,
[data-a11y-theme="yellow-on-black"] .custom-footer,
[data-a11y-theme="yellow-on-black"] .top-navbar {
    background-color: #000000 !important;
    color: #ffff00 !important;
    border-color: #ffff00 !important;
}

[data-a11y-theme="yellow-on-black"] h1,
[data-a11y-theme="yellow-on-black"] h2,
[data-a11y-theme="yellow-on-black"] h3,
[data-a11y-theme="yellow-on-black"] h4,
[data-a11y-theme="yellow-on-black"] h5 {
    color: #00ffff !important;
}

[data-a11y-theme="yellow-on-black"] a {
    color: #ffff00 !important;
    text-decoration: underline;
}

[data-a11y-theme="yellow-on-black"] a:hover,
[data-a11y-theme="yellow-on-black"] a:focus {
    color: #00ffff !important;
}

[data-a11y-theme="yellow-on-black"] .line-by-line p,
[data-a11y-theme="yellow-on-black"] .verse-item {
    color: #ffff00 !important;
    border-bottom: 2px solid #ffff00 !important;
}

[data-a11y-theme="yellow-on-black"] .accordion-button {
    background-color: #000000 !important;
    color: #ffff00 !important;
    border: 1px solid #ffff00 !important;
}

[data-a11y-theme="yellow-on-black"] .accordion-button:not(.collapsed) {
    background-color: #1a1a00 !important;
    color: #00ffff !important;
}

[data-a11y-theme="yellow-on-black"] .chapterList a {
    background-color: #000000 !important;
    color: #ffff00 !important;
    border: 2px solid #ffff00 !important;
}

[data-a11y-theme="yellow-on-black"] .chapterList a.selval {
    background-color: #ffff00 !important;
    color: #000000 !important;
}

[data-a11y-theme="yellow-on-black"] *:focus-visible {
    outline: 3px solid #00ffff !important;
}

/* Theme: Soft Sepia */
[data-a11y-theme="sepia"] body {
    background-color: #f4ecd8 !important;
    color: #382a1d !important;
}

[data-a11y-theme="sepia"] .main-reading-area,
[data-a11y-theme="sepia"] .sidebar-container,
[data-a11y-theme="sepia"] .breadcrumb-container {
    background-color: #fdf8eb !important;
    border-color: #d7c9a8 !important;
    color: #382a1d !important;
}

[data-a11y-theme="sepia"] .top-navbar {
    background-color: #4a3424 !important;
    border-bottom: 4px solid #a67c52 !important;
}

/* ==========================================================================
   5. Generous Text Spacing (WCAG 1.4.12)
   ========================================================================== */
[data-a11y-spacing="generous"] {
    --a11y-line-height: 2.2 !important;
    --a11y-letter-spacing: 0.08em !important;
    --a11y-word-spacing: 0.16em !important;
}

[data-a11y-spacing="generous"] .line-by-line p,
[data-a11y-spacing="generous"] .verse-item {
    margin-bottom: 1.25rem !important;
    padding-top: 14px !important;
    padding-bottom: 14px !important;
}

/* ==========================================================================
   6. Scripture Reading & Verse Styling
   ========================================================================== */
.bible-verses-list {
    list-style-type: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.verse-item {
    position: relative;
    padding: 12px 10px;
    border-bottom: 1px solid #ffe0b2;
    transition: background-color 0.2s ease;
    font-size: calc(1.15rem * var(--a11y-font-scale));
    line-height: var(--a11y-line-height);
}

.verse-item:hover {
    background-color: #fffdf5;
}

.verse-number {
    font-weight: 700;
    color: #b71c1c;
    margin-right: 0.5rem;
    user-select: none;
}

.verse-text {
    color: #212121;
}

[data-a11y-theme="high-contrast-dark"] .verse-text {
    color: #f5f5f5;
}

[data-a11y-theme="yellow-on-black"] .verse-text {
    color: #ffff00;
}

[data-a11y-theme="yellow-on-black"] .verse-number {
    color: #00ffff;
}

/* Verse action buttons */
.verse-actions {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-left: 0.75rem;
    vertical-align: middle;
}

.verse-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 6px;
    border-radius: 4px;
    border: 1px solid #ced4da;
    background-color: #f8f9fa;
    color: #495057;
    text-decoration: none;
    font-size: 0.85rem;
    cursor: pointer;
    min-width: 32px;
    min-height: 32px;
}

.verse-action-btn:hover,
.verse-action-btn:focus {
    background-color: #e9ecef;
    border-color: #adb5bd;
    color: #212529;
}

/* ==========================================================================
   7. Chapter Grid & Navigation
   ========================================================================== */
.chapter-nav-container {
    padding: 0.75rem;
    background-color: #fffaf0;
    border: 2px solid #ffdc75;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.chapter-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.chapter-grid-item {
    margin: 0;
}

.chapter-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: 6px 10px;
    border-radius: 6px;
    background-color: #e9ecef;
    color: #212529;
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    border: 2px solid #ced4da;
    transition: all 0.15s ease;
}

.chapter-btn:hover {
    background-color: #1b5e20;
    color: #ffffff;
    border-color: #1b5e20;
}

.chapter-btn.selval,
.chapter-btn[aria-current="page"] {
    background-color: #f57f17 !important;
    color: #ffffff !important;
    border-color: #bf360c !important;
    box-shadow: 0 0 0 2px rgba(245, 127, 23, 0.4);
}

/* Chapter Traversal Prev / Next Buttons */
.chapter-traversal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 2px solid #ffdc75;
    gap: 1rem;
    flex-wrap: wrap;
}

.traversal-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 10px 18px;
    font-size: 1.05rem;
    font-weight: 700;
    border-radius: 6px;
    background-color: #1b5e20;
    color: #ffffff !important;
    border: 2px solid #1b5e20;
    text-decoration: none !important;
    min-height: 44px;
}

.traversal-btn:hover,
.traversal-btn:focus {
    background-color: #0d3810;
    border-color: #0d3810;
    color: #ffeb3b !important;
}

.traversal-btn:disabled,
.traversal-btn.disabled {
    background-color: #adb5bd;
    border-color: #adb5bd;
    cursor: not-allowed;
    opacity: 0.65;
}

/* ==========================================================================
   8. Modal Dialog for Keyboard Shortcuts
   ========================================================================== */
.a11y-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.75);
    z-index: 100050;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.a11y-modal {
    background-color: #ffffff;
    color: #212529;
    border-radius: 10px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 3px solid #1b5e20;
}

.a11y-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
}

.a11y-shortcuts-table {
    width: 100%;
    border-collapse: collapse;
}

.a11y-shortcuts-table th,
.a11y-shortcuts-table td {
    padding: 0.65rem 0.5rem;
    border-bottom: 1px solid #e9ecef;
    text-align: left;
}

.a11y-kbd {
    background-color: #f1f3f5;
    border: 1px solid #ced4da;
    border-bottom: 2px solid #adb5bd;
    border-radius: 4px;
    padding: 2px 8px;
    font-family: monospace;
    font-size: 0.95rem;
    font-weight: 700;
    color: #212529;
}