/* Стилі для функцій доступності */

/* Кнопка доступності */
.accessibility-toggle {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #2f6fbf;
    color: white;
    font-size: 24px;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 12001;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

/* Захист локальної SVG-іконки доступності від зникнення */
.accessibility-toggle .ui-icon,
html.a11y-high-contrast .accessibility-toggle .ui-icon,
html.a11y-sans-serif-font .accessibility-toggle .ui-icon,
html.a11y-larger-text .accessibility-toggle .ui-icon,
html.a11y-increased-spacing .accessibility-toggle .ui-icon,
html.a11y-reduce-animations .accessibility-toggle .ui-icon {
    width: 24px !important;
    height: 24px !important;
}

.accessibility-toggle:hover {
    background-color: #275fa4;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.22);
}

.accessibility-toggle:focus {
    outline: 3px solid #ffb300;
    outline-offset: 2px;
}

/* Панель налаштувань доступності */
.accessibility-panel {
    position: fixed;
    bottom: 80px;
    left: 20px;
    width: 320px;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    z-index: 12001;
    padding: 0;
    overflow: hidden;
    transition: transform 0.3s, opacity 0.3s;
    transform-origin: bottom left;
}

.accessibility-panel[hidden] {
    display: none;
}

.accessibility-panel.show-panel {
    display: block;
    animation: slideIn 0.3s forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.accessibility-panel.show-panel {
    display: block !important;
}

.accessibility-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    min-height: 60px;
    padding: 15px 20px;
    background-color: #2f6fbf;
    color: white;
    border-radius: 12px 12px 0 0;
}

.accessibility-header h3 {
    flex: 1 1 auto;
    min-width: 0;
    max-width: calc(100% - 56px);
    margin: 0;
    color: white;
    font-size: 1.2rem;
    line-height: 1.2;
    pointer-events: none;
}

.close-btn {
    position: relative;
    z-index: 1;
    flex: 0 0 44px;
    align-self: flex-start;
    margin-left: auto;
    pointer-events: auto;
    background: transparent;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    width: 44px;
    height: 44px;
    padding: 0;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.accessibility-options {
    padding: 20px;
}

.accessibility-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    min-height: 44px;
}

.accessibility-option label {
    font-weight: 500;
    cursor: pointer;
}

/* Стиль перемикача */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    cursor: pointer;
    z-index: 2;
}

.toggle-switch input:focus + .toggle-slider {
    box-shadow: 0 0 2px 2px #ffb300;
    outline: none;
}


.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 5px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: #32cd32;
}

input:focus + .toggle-slider {
    box-shadow: 0 0 1px #32cd32;
}

input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.accessibility-footer {
    padding: 15px 20px;
    text-align: center;
    border-top: 1px solid #eee;
}

/* Класи для модифікації сайту згідно з налаштуваннями доступності */

/* Високий контраст */
.a11y-high-contrast {
    --bg-color: #000 !important;
    --text-color: #fff !important;
    --border-color: #fff !important;
}

.a11y-high-contrast body {
    background-color: var(--bg-color);
    color: var(--text-color);
}

.a11y-high-contrast .btn-primary {
    background-color: #3d85c6;
    color: var(--text-color);
}

/* Додаткові стилі для високого контрасту */
.a11y-high-contrast .btn,
.a11y-high-contrast .tab-button,
.a11y-high-contrast .example-block,
.a11y-high-contrast .example-section,
.a11y-high-contrast .accessibility-panel,
.a11y-high-contrast .accessibility-header,
.a11y-high-contrast .accessibility-option,
.a11y-high-contrast .lesson-content,
.a11y-high-contrast .resource-item,
.a11y-high-contrast .panel,
.a11y-high-contrast .card,
.a11y-high-contrast .main-header,
.a11y-high-contrast .content-container {
    background-color: var(--bg-color) !important;
    color: var(--text-color) !important;
    border-color: var(--border-color) !important;
}

.a11y-high-contrast .accessibility-panel,
.a11y-high-contrast .lesson-content,
.a11y-high-contrast .resource-item,
.a11y-high-contrast .panel,
.a11y-high-contrast .card {
    box-shadow: 0 0 0 2px var(--border-color) !important;
}

.a11y-high-contrast .code-box,
.a11y-high-contrast .canvas-box {
    border-color: var(--border-color);
    background-color: var(--bg-color);
}

.a11y-high-contrast .code-editor,
.a11y-high-contrast #code-editor {
    background-color: #111;
    color: #fff;
    border-color: var(--border-color);
}

/* Збільшений текст */
.a11y-larger-text {
    font-size: 120% !important;
}

.a11y-larger-text h1 {
    font-size: 2.4rem !important;
}

.a11y-larger-text h2 {
    font-size: 2rem !important;
}

.a11y-larger-text h3 {
    font-size: 1.7rem !important;
}

.a11y-larger-text .btn {
    font-size: 1.2rem !important;
    padding: 12px 24px !important;
}

.a11y-larger-text #code-editor {
    font-size: 1.2rem !important;
}

/* Зменшення анімації */
.a11y-reduce-animations * {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
}

.a11y-reduce-animations .btn:hover {
    transform: none !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1) !important;
}

/* Простий шрифт */
.a11y-sans-serif-font body,
.a11y-sans-serif-font p,
.a11y-sans-serif-font span,
.a11y-sans-serif-font div,
.a11y-sans-serif-font a,
.a11y-sans-serif-font button,
.a11y-sans-serif-font input,
.a11y-sans-serif-font textarea,
.a11y-sans-serif-font select,
.a11y-sans-serif-font label,
.a11y-sans-serif-font li,
.a11y-sans-serif-font dt,
.a11y-sans-serif-font dd,
.a11y-sans-serif-font th,
.a11y-sans-serif-font td,
.a11y-sans-serif-font h1,
.a11y-sans-serif-font h2,
.a11y-sans-serif-font h3,
.a11y-sans-serif-font h4,
.a11y-sans-serif-font h5,
.a11y-sans-serif-font h6 {
    font-family: Arial, Helvetica, sans-serif !important;
}
.a11y-sans-serif-font #code-editor {
    font-family: 'Courier New', monospace !important;
}

/* Local SVG ui-icons inherit color and stay stable in the simple-font mode. */

/* Збільшені інтервали */
.a11y-increased-spacing {
    letter-spacing: 0.05em !important;
    word-spacing: 0.1em !important;
    line-height: 1.8 !important;
}

.a11y-increased-spacing p,
.a11y-increased-spacing li {
    margin-bottom: 1em !important;
}

.a11y-increased-spacing .btn {
    margin: 0.25em !important;
}

.a11y-increased-spacing #code-editor {
    line-height: 1.8 !important;
}

/* --- Accessibility hardening for readability/contrast --- */
.a11y-high-contrast h1,
.a11y-high-contrast h2,
.a11y-high-contrast h3,
.a11y-high-contrast h4,
.a11y-high-contrast h5,
.a11y-high-contrast h6,
.a11y-high-contrast p,
.a11y-high-contrast li,
.a11y-high-contrast label,
.a11y-high-contrast legend,
.a11y-high-contrast small,
.a11y-high-contrast dt,
.a11y-high-contrast dd {
    color: var(--text-color) !important;
}

.a11y-high-contrast header.main-header,
.a11y-high-contrast header.main-header h1,
.a11y-high-contrast header.main-header h2,
.a11y-high-contrast .course-header,
.a11y-high-contrast .course-header h1,
.a11y-high-contrast .course-header p,
.a11y-high-contrast footer.main-footer,
.a11y-high-contrast footer.main-footer p {
    color: #fff !important;
}

.a11y-high-contrast a {
    color: #7dd3ff !important;
    text-decoration: underline;
}

.a11y-high-contrast a:hover,
.a11y-high-contrast a:focus-visible {
    color: #ffe082 !important;
}

.a11y-high-contrast .btn {
    background: #000 !important;
    color: #fff !important;
    border: 2px solid #fff !important;
    box-shadow: none !important;
}

.a11y-high-contrast .btn:hover,
.a11y-high-contrast .btn:focus-visible {
    background: #fff !important;
    color: #000 !important;
}

.a11y-high-contrast .btn:disabled,
.a11y-high-contrast .btn[disabled] {
    opacity: 1 !important;
    color: #9aa0a6 !important;
    border-color: #666 !important;
    background: #111 !important;
}

.a11y-high-contrast :focus-visible {
    outline: 3px solid #7dd3ff !important;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px #000 !important;
    border-radius: 6px;
}

.a11y-high-contrast .accessibility-header {
    background: #000 !important;
    color: #fff !important;
    border-bottom: 1px solid #fff !important;
}

.a11y-high-contrast .accessibility-option {
    background: #000 !important;
    color: #fff !important;
}

.a11y-high-contrast .toggle-slider {
    background-color: #555 !important;
    border: 1px solid #fff !important;
}

.a11y-high-contrast .toggle-slider:before {
    background-color: #fff !important;
}

.a11y-high-contrast input:checked + .toggle-slider {
    background-color: #0a7d34 !important;
}

.a11y-high-contrast .accessibility-footer {
    border-top: 1px solid #fff !important;
}

/* Ensure all modal variants are readable in high-contrast mode */
.a11y-high-contrast .modal-content {
    background: #000 !important;
    color: #fff !important;
    border: 2px solid #fff !important;
    box-shadow: none !important;
}

.a11y-high-contrast .modal-content,
.a11y-high-contrast .modal-content * {
    color: #fff !important;
}

.a11y-high-contrast .modal-content .modal-title {
    color: #ffe082 !important;
}

.a11y-high-contrast .modal-content .btn {
    background: #000 !important;
    color: #fff !important;
    border: 2px solid #fff !important;
}

.a11y-high-contrast .modal-content .btn:hover,
.a11y-high-contrast .modal-content .btn:focus-visible {
    background: #fff !important;
    color: #000 !important;
}

.a11y-high-contrast .resource-section,
.a11y-high-contrast .resource-item,
.a11y-high-contrast .coming-soon,
.a11y-high-contrast .quiz-card,
.a11y-high-contrast .quiz-question,
.a11y-high-contrast .quiz-option,
.a11y-high-contrast .quiz-result,
.a11y-high-contrast #quiz-question-list:empty::before,
.a11y-high-contrast .quiz-settings select,
.a11y-high-contrast .tabs-container,
.a11y-high-contrast .lesson-content,
.a11y-high-contrast .lesson-path-section,
.a11y-high-contrast .lesson-content .why-important,
.a11y-high-contrast .lesson-content .code-example,
.a11y-high-contrast .task,
.a11y-high-contrast .tip,
.a11y-high-contrast .lesson-path-table thead th,
.a11y-high-contrast .lesson-path-table tbody td,
.a11y-high-contrast .lesson-content details,
.a11y-high-contrast .lesson-content summary,
.a11y-high-contrast .parent-card,
.a11y-high-contrast .teacher-card,
.a11y-high-contrast .track-card,
.a11y-high-contrast .print-sheet,
.a11y-high-contrast .print-block,
.a11y-high-contrast .phrase,
.a11y-high-contrast .teacher-table,
.a11y-high-contrast .teacher-table th,
.a11y-high-contrast .teacher-table td {
    background: #000 !important;
    color: #fff !important;
    border-color: #fff !important;
    box-shadow: none !important;
}

.a11y-high-contrast .resource-item pre,
.a11y-high-contrast .resource-item code {
    background: #000 !important;
    color: #fff !important;
    border-color: #fff !important;
}

.a11y-high-contrast .resource-section h2,
.a11y-high-contrast .resource-section h3,
.a11y-high-contrast .resource-item h4,
.a11y-high-contrast .resource-section p,
.a11y-high-contrast .resource-section li,
.a11y-high-contrast .resource-item p,
.a11y-high-contrast .quiz-settings h4,
.a11y-high-contrast .quiz-question legend,
.a11y-high-contrast .quiz-option-text,
.a11y-high-contrast .quiz-card p,
.a11y-high-contrast .quiz-result,
.a11y-high-contrast .quiz-settings label,
.a11y-high-contrast .lesson-path-section p,
.a11y-high-contrast .lesson-path-index,
.a11y-high-contrast .lesson-content .lesson-path-table tbody td:nth-child(2),
.a11y-high-contrast .lesson-content .lesson-path-table tbody td:nth-child(3),
.a11y-high-contrast .lesson-content h2,
.a11y-high-contrast .lesson-content h3,
.a11y-high-contrast .tip strong,
.a11y-high-contrast .parent-card h3,
.a11y-high-contrast .parent-card h4,
.a11y-high-contrast .parent-card p,
.a11y-high-contrast .parent-card li,
.a11y-high-contrast .teacher-card h3,
.a11y-high-contrast .teacher-card h4,
.a11y-high-contrast .teacher-card p,
.a11y-high-contrast .teacher-card li,
.a11y-high-contrast .teacher-table th,
.a11y-high-contrast .teacher-table td,
.a11y-high-contrast .phrase {
    color: #fff !important;
}

.a11y-high-contrast .lesson-content h2,
.a11y-high-contrast .lesson-content h3,
.a11y-high-contrast .tip strong {
    border-color: #fff !important;
}

.a11y-high-contrast .coming-soon {
    border: 1px dashed #fff !important;
}

.a11y-high-contrast .lesson-path-dot {
    border-color: #fff !important;
}

.a11y-high-contrast .print-sheet li::before,
.a11y-high-contrast .print-checklist li::before {
    border-color: #fff !important;
    background: #000 !important;
}

.a11y-high-contrast body #global-message-display.message-a11y-global {
    background: #000 !important;
    color: #fff !important;
    border: 2px solid #fff !important;
    border-left: 6px solid #7dd3ff !important;
    background-image: none !important;
}

.a11y-high-contrast body #global-message-display.message-a11y-global .message-text-global,
.a11y-high-contrast body #global-message-display.message-a11y-global i,
.a11y-high-contrast body #global-message-display.message-a11y-global .message-close-btn-global {
    color: #fff !important;
}

.a11y-high-contrast body #global-message-display.message-a11y-global .message-close-btn-global:hover {
    background-color: #222 !important;
}

.a11y-larger-text .accessibility-panel {
    width: min(92vw, 380px);
}

.a11y-larger-text .accessibility-panel-title {
    font-size: 1.35rem !important;
}

.a11y-larger-text .accessibility-option label,
.a11y-larger-text .toc-list a,
.a11y-larger-text .guide-section p,
.a11y-larger-text .guide-section li {
    line-height: 1.5;
}

.a11y-increased-spacing .toc-list li {
    margin-bottom: 0.9em !important;
}

.a11y-increased-spacing .accessibility-option {
    margin-bottom: 1.1em !important;
}

.a11y-larger-text .modal-content {
    width: min(94vw, 560px);
    min-width: 0;
}

.a11y-larger-text .modal-title {
    line-height: 1.2;
}

.a11y-larger-text .modal-actions .btn {
    padding: 12px 16px !important;
    min-height: 56px;
}

html.a11y-reduce-animations,
html.a11y-reduce-animations body {
    scroll-behavior: auto !important;
}

.a11y-reduce-animations *,
.a11y-reduce-animations *::before,
.a11y-reduce-animations *::after {
    animation: none !important;
    transition: none !important;
}

@media (max-width: 1279px) {
    .accessibility-toggle {
        top: calc(16px + env(safe-area-inset-top));
        bottom: auto;
        left: 16px;
        right: auto;
    }

    .accessibility-panel {
        top: calc(74px + env(safe-area-inset-top));
        bottom: auto;
        left: 12px;
        right: auto;
        width: min(92vw, 320px);
        transform-origin: top left;
    }

    .a11y-larger-text .accessibility-panel {
        width: min(94vw, 360px);
    }
}