/**
 * Imperial Academy - LMS Frontend Styles
 */

/* CSS Custom Properties for Course Player */
:root {
    /* Responsive Breakpoints */
    --ia-mobile-max: 768px;
    --ia-tablet-min: 769px;
    --ia-tablet-max: 1024px;
    --ia-desktop-min: 1025px;

    /* Mobile-specific spacing */
    --ia-mobile-padding: 16px;
    --ia-mobile-gap: 12px;
    --ia-touch-target: 44px;

    /* Header heights */
    --ia-header-height-mobile: 60px;
    --ia-header-height-desktop: 80px;

    /* Sidebar dimensions */
    --ia-sidebar-width-mobile: 85vw;
    --ia-sidebar-max-width: 350px;

    /* Z-index layers */
    --ia-z-header: 1000;
    --ia-z-sidebar: 1100;
    --ia-z-overlay: 1050;
    --ia-z-modal: 1200;

    /* Responsive font sizes */
    --ia-font-size-mobile: 0.9rem;
    --ia-font-size-desktop: 1rem;
    --ia-font-size-small-mobile: 0.8rem;
    --ia-font-size-small-desktop: 0.85rem;

    /* Border radius */
    --ia-radius-mobile: 6px;
    --ia-radius-desktop: 8px;

    /* Transitions */
    --ia-transition-fast: 0.15s ease;
    --ia-transition-normal: 0.2s ease;
    --ia-transition-slow: 0.3s ease;
}

/* =====================================================
   Text Handling and Long Content Management
   ===================================================== */

/* Base text handling utilities */
.ia-text-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ia-text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

.ia-text-truncate-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

.ia-text-break {
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
    hyphens: auto;
    -webkit-hyphens: auto;
    -moz-hyphens: auto;
}

/* Long content handling for lesson titles */
.ia-lesson-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 0.5rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    -webkit-hyphens: auto;
    -moz-hyphens: auto;
}

/* Course name in header - responsive truncation */
.ia-course-name {
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

/* Lesson name in mobile header */
.ia-lesson-info-mobile .ia-lesson-name {
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    font-weight: 500;
    color: var(--ia-text-light);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

/* Navigation button text handling */
.ia-nav-btn span {
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    line-height: 1.3;
}

.ia-nav-btn small {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Resource titles */
.ia-resource-title {
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

/* Sidebar lesson titles */
.ia-lesson-item .ia-lesson-title {
    font-size: 0.9rem;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    line-height: 1.3;
    margin: 0;
}

/* Discussion and comment text */
.ia-discussion-content,
.ia-comment-content {
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    hyphens: none;
    -webkit-hyphens: none;
    -moz-hyphens: none;
}

/* Long URLs and code snippets */
.ia-lesson-content code,
.ia-lesson-content pre {
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: pre-wrap;
    overflow-x: auto;
}

/* Comment section mobile responsive fixes */
@media (max-width: 768px) {

    .ia-discussion-comment,
    .ia-discussion-reply {
        gap: 10px;
    }

    .ia-discussion-comment .ia-comment-avatar img,
    .ia-discussion-reply .ia-comment-avatar img {
        width: 32px;
        height: 32px;
    }

    .ia-comment-header {
        flex-wrap: wrap;
        gap: 4px 10px;
    }

    .ia-comment-author {
        overflow-wrap: break-word;
        word-break: normal;
    }

    .ia-comment-body {
        overflow-wrap: break-word;
        word-break: normal;
    }

    .ia-comment-body p {
        overflow-wrap: break-word;
        word-break: normal;
    }

    .ia-comment-actions {
        flex-wrap: wrap;
        gap: 8px;
    }

    .ia-comment-replies {
        padding-left: 12px;
    }
}

@media (max-width: 380px) {

    .ia-discussion-comment,
    .ia-discussion-reply {
        gap: 8px;
    }

    .ia-discussion-comment .ia-comment-avatar img,
    .ia-discussion-reply .ia-comment-avatar img {
        width: 28px;
        height: 28px;
    }

    .ia-comment-header {
        gap: 2px 8px;
    }

    .ia-comment-author {
        font-size: 0.85rem;
    }

    .ia-comment-time {
        font-size: 0.75rem;
    }

    .ia-comment-body {
        font-size: 0.88rem;
    }

    .ia-comment-replies {
        padding-left: 8px;
    }

    .ia-discussions-content {
        padding: 12px;
    }
}

/* Responsive text sizes for small screens */
@media (max-width: 480px) {
    .ia-lesson-title {
        font-size: 1.1rem;
        line-height: 1.25;
    }

    .ia-course-name {
        font-size: 0.85rem;
    }

    .ia-lesson-info-mobile .ia-lesson-name {
        font-size: 0.75rem;
    }

    /* More aggressive truncation on very small screens */
    .ia-nav-btn span {
        -webkit-line-clamp: 1;
        line-clamp: 1;
    }

    .ia-sidebar-lesson-title {
        -webkit-line-clamp: 1;
        line-clamp: 1;
    }
}

/* =====================================================
   Cross-Browser Compatibility and Fallbacks
   ===================================================== */

/* No padding-top needed on .ia-player-layout:
   .ia-player-header uses position:sticky (not fixed), so it doesn't
   overlap content — adding padding-top here creates the white/dark gap
   visible between the site header and the player header. */

/* Hide inline course content section on desktop — the sidebar already
   shows the lesson list. Without this, the collapsible block creates
   an unwanted gap under the lesson navigation buttons on desktop. */
@media (min-width: 1025px) {
    .ia-course-content-section {
        display: none;
    }
}

/* Flexbox fallbacks for older browsers */
.ia-lesson-navigation {
    display: block;
    /* Fallback for non-flexbox browsers */
}

@supports (display: flex) {
    .ia-lesson-navigation {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
    }
}

/* Grid fallbacks for older browsers */
.ia-language-controls {
    /* Fallback: inline-block layout */
    font-size: 0;
    /* Remove whitespace between inline-block elements */
}

.ia-language-controls .ia-control-group {
    display: inline-block;
    font-size: 1rem;
    /* Reset font-size */
    margin-right: 8px;
    vertical-align: top;
}

@supports (display: flex) {
    .ia-language-controls {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: inherit;
    }

    .ia-language-controls .ia-control-group {
        display: block;
        margin-right: 0;
    }
}

/* Webkit line-clamp fallbacks */
.ia-text-truncate-2 {
    /* Fallback for browsers without -webkit-line-clamp */
    max-height: 2.8em;
    /* Approximate height for 2 lines */
    overflow: hidden;
}

.ia-text-truncate-3 {
    /* Fallback for browsers without -webkit-line-clamp */
    max-height: 4.2em;
    /* Approximate height for 3 lines */
    overflow: hidden;
}

/* Backdrop-filter fallbacks */
.ia-sidebar-backdrop {
    background: rgba(0, 0, 0, 0.5);
    /* Fallback */
    background: rgba(0, 0, 0, 0.3);
    /* Lighter fallback for backdrop-filter */
}

@supports (backdrop-filter: blur(4px)) {
    .ia-sidebar-backdrop {
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
    }
}

/* Transform fallbacks for animations */
.ia-player-sidebar {
    /* Fallback positioning for browsers without transform support */
    right: -350px;
    transition: right 0.3s ease;
}

@supports (transform: translateX(0)) {
    .ia-player-sidebar {
        right: 0;
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }

    .ia-player-sidebar.active {
        transform: translateX(0);
    }
}

/* Without transform support, use right positioning */
@supports not (transform: translateX(0)) {
    .ia-player-sidebar.active {
        right: 0;
    }
}

/* Sticky positioning fallbacks */
.ia-player-header {
    position: fixed;
    /* Fallback for browsers without sticky support */
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--ia-z-header, 100);
}

@supports (position: sticky) {
    .ia-player-header {
        position: sticky;
        top: 0;
    }
}

/* Object-fit fallbacks for older browsers */
.ia-instructor-avatar img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    /* Fallback: center the image */
    background-size: cover;
    background-position: center;
}

@supports (object-fit: cover) {
    .ia-instructor-avatar img {
        object-fit: cover;
    }
}

/* Clamp() fallbacks for font sizes */
.ia-lesson-title {
    font-size: 1.25rem;
    /* Fallback */
}

@media (min-width: 480px) {
    .ia-lesson-title {
        font-size: 1.5rem;
    }
}

@media (min-width: 768px) {
    .ia-lesson-title {
        font-size: 1.75rem;
    }
}

@supports (font-size: clamp(1rem, 2vw, 2rem)) {
    .ia-lesson-title {
        font-size: clamp(1.25rem, 3vw, 1.75rem);
    }
}

/* Touch-action fallbacks */
.ia-video-container,
.ia-language-controls {
    /* Fallback: prevent default touch behaviors */
    -ms-touch-action: manipulation;
    touch-action: manipulation;
}

/* User-select fallbacks */
.ia-control-btn,
.ia-nav-btn {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Appearance fallbacks for control buttons */
.ia-control-btn {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border: none;
    background: none;
}

/* =====================================================
   Final Integration and Validation Styles
   ===================================================== */

/* Ensure consistent behavior across all screen sizes */
.ia-course-player-page {
    /* Prevent horizontal scroll on all devices */
    overflow-x: hidden;
    /* Ensure proper text rendering */
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Comprehensive responsive header validation */
.ia-player-header {
    /* Ensure header works on all screen sizes */
    width: 100%;
    max-width: 100vw;
    box-sizing: border-box;
    /* Prevent content overflow */
    overflow: hidden;
}

.ia-header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 100%;
    padding: 0 var(--ia-mobile-padding, 16px);
    box-sizing: border-box;
}

/* Sidebar integration validation */
.ia-player-sidebar {
    /* Ensure sidebar works consistently */
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    height: 100dvh;
    width: var(--ia-sidebar-width-mobile, 85vw);
    max-width: var(--ia-sidebar-max-width, 350px);
    z-index: var(--ia-z-sidebar, 200);
    /* Prevent content overflow */
    overflow-y: auto;
    overflow-x: hidden;
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

/* Video container integration validation */
.ia-video-container {
    /* Ensure video works on all devices */
    position: relative;
    width: 100%;
    max-width: 100%;
    /* Maintain aspect ratio */
    aspect-ratio: 16 / 9;
    /* Fallback for browsers without aspect-ratio */
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    background: #000;
}

@supports (aspect-ratio: 16 / 9) {
    .ia-video-container {
        padding-bottom: 0;
        height: auto;
    }
}

.ia-video-container iframe,
.ia-video-container video,
.ia-video-container #ia-youtube-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Touch target validation - ensure all interactive elements meet requirements */
.ia-control-btn,
.ia-nav-btn,
.ia-btn,
.ia-mobile-sidebar-toggle,
.ia-course-player-page button {
    min-height: var(--ia-touch-target, 44px);
    min-width: var(--ia-touch-target, 44px);
    /* Ensure proper touch feedback */
    cursor: pointer;
    /* Prevent text selection on touch */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    /* Ensure proper focus handling */
    outline: none;
}

.ia-control-btn:focus,
.ia-nav-btn:focus,
.ia-btn:focus,
.ia-mobile-sidebar-toggle:focus,
.ia-course-player-page button:focus {
    /* Visible focus indicator */
    box-shadow: 0 0 0 2px var(--ia-primary, #0066cc);
    outline: 2px solid transparent;
}

/* Accessibility validation */
.ia-mobile-sidebar-toggle[aria-expanded="true"] {
    /* Visual indication when sidebar is open */
    background-color: var(--ia-primary, #0066cc);
    color: white;
}

/* Performance optimization validation */
.ia-player-sidebar,
.ia-sidebar-backdrop,
.ia-mobile-overlay {
    /* Hardware acceleration for smooth animations */
    will-change: transform, opacity;
    transform: translateZ(0);
}

/* Remove will-change after animation completes to save resources */
.ia-player-sidebar:not(.active),
.ia-sidebar-backdrop:not(.active),
.ia-mobile-overlay:not(.active) {
    will-change: auto;
}

/* Text content validation - ensure readability */
.ia-lesson-content,
.ia-lesson-description,
.ia-discussion-content {
    /* Optimal line length for readability */
    max-width: 65ch;
    /* Proper line height */
    line-height: 1.6;
    /* Prevent orphans and widows */
    orphans: 2;
    widows: 2;
}

/* Final responsive validation */
@media (max-width: 320px) {

    /* Extra small screens validation */
    .ia-header-content {
        padding: 0 12px;
    }

    .ia-mobile-sidebar-toggle {
        min-width: 40px;
        min-height: 40px;
    }

    .ia-control-btn {
        min-width: 40px;
        min-height: 40px;
        font-size: 0.8rem;
    }
}

@media (min-width: 1200px) {

    /* Large screens validation */
    .ia-lesson-content,
    .ia-lesson-description {
        max-width: 70ch;
    }
}

/* Print styles for accessibility */
@media print {

    .ia-player-header,
    .ia-mobile-sidebar-toggle,
    .ia-player-sidebar,
    .ia-sidebar-backdrop,
    .ia-language-controls {
        display: none !important;
    }

    .ia-lesson-content,
    .ia-lesson-description {
        max-width: none;
        width: 100%;
    }
}

/* =====================================================
   Course Single Page - Hero Section
   ===================================================== */
.ia-course-hero {
    position: relative;
    padding: 80px 0;
    background: var(--ia-primary);
    color: #fff;
    overflow: hidden;
}

.ia-course-hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.ia-course-hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.ia-course-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.95) 0%, rgba(10, 22, 40, 0.8) 100%);
    z-index: 1;
}

.ia-course-hero .ia-container {
    position: relative;
    z-index: 2;
}

.ia-course-hero-content {
    max-width: 700px;
}

.ia-course-category-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(212, 175, 55, 0.2);
    border: 1px solid var(--ia-secondary);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ia-secondary);
    margin-bottom: 1rem;
}

.ia-course-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    margin: 0 0 1rem;
}

.ia-course-excerpt {
    font-size: 1.125rem;
    opacity: 0.9;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.ia-course-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.ia-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.ia-meta-item svg {
    opacity: 0.7;
}

.ia-meta-highlight {
    color: var(--ia-secondary);
    opacity: 1;
}

.ia-meta-highlight svg {
    stroke: var(--ia-secondary);
    opacity: 1;
}

.ia-course-instructor-mini {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.ia-instructor-avatar img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.ia-instructor-label {
    display: block;
    font-size: 0.75rem;
    opacity: 0.7;
}

.ia-instructor-name {
    font-weight: 600;
}

/* =====================================================
   Course Content Layout
   ===================================================== */
.ia-course-content-wrapper {
    padding: 3rem 0;
}

.ia-course-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .ia-course-layout {
        grid-template-columns: 1fr;
    }

    .ia-course-sidebar {
        order: -1;
    }
}

/* =====================================================
   Tabs Navigation
   ===================================================== */
.ia-course-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--ia-border);
    margin-bottom: 2rem;
}

.ia-tab-btn {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ia-text-light);
    cursor: pointer;
    position: relative;
    transition: color var(--ia-transition);
}

.ia-tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: transparent;
    transition: background var(--ia-transition);
}

.ia-tab-btn:hover {
    color: var(--ia-primary);
}

.ia-tab-btn.active {
    color: var(--ia-primary);
}

.ia-tab-btn.active::after {
    background: var(--ia-secondary);
}

.ia-tab-content {
    display: none;
}

.ia-tab-content.active {
    display: block;
}

/* =====================================================
   Course Sections
   ===================================================== */
.ia-course-section {
    margin-bottom: 2.5rem;
}

.ia-course-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--ia-text);
}

.ia-course-description {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--ia-text-light);
}

/* =====================================================
   Learning Outcomes
   ===================================================== */
.ia-outcomes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

@media (max-width: 768px) {
    .ia-outcomes-grid {
        grid-template-columns: 1fr;
    }
}

.ia-outcomes-grid li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 1rem;
    background: var(--ia-background);
    border-radius: var(--ia-radius-md);
    font-size: 0.95rem;
    line-height: 1.5;
}

.ia-outcomes-grid li svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* =====================================================
   Requirements & Audience
   ===================================================== */
.ia-requirements-list,
.ia-audience-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ia-requirements-list li,
.ia-audience-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--ia-border);
    font-size: 0.95rem;
    line-height: 1.5;
}

.ia-requirements-list li:last-child,
.ia-audience-list li:last-child {
    border-bottom: none;
}

.ia-requirements-list li svg,
.ia-audience-list li svg {
    flex-shrink: 0;
    margin-top: 3px;
}

/* =====================================================
   Curriculum Accordion
   ===================================================== */
.ia-curriculum-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.ia-curriculum-stats {
    font-size: 0.9rem;
    color: var(--ia-text-light);
}

.ia-curriculum-accordion {
    border: 1px solid var(--ia-border);
    border-radius: var(--ia-radius-lg);
    overflow: hidden;
}

.ia-curriculum-section {
    border-bottom: 1px solid var(--ia-border);
}

.ia-curriculum-section:last-child {
    border-bottom: none;
}

.ia-curriculum-section-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--ia-background);
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background var(--ia-transition);
}

.ia-curriculum-section-header:hover {
    background: #eef1f5;
}

.ia-section-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ia-section-info .ia-section-title {
    font-weight: 600;
    color: var(--ia-text);
}

.ia-chevron {
    transition: transform var(--ia-transition);
}

.ia-curriculum-section-header[aria-expanded="true"] .ia-chevron {
    transform: rotate(180deg);
}

.ia-section-meta {
    font-size: 0.85rem;
    color: var(--ia-text-light);
}

.ia-curriculum-section-content {
    background: #fff;
}

.ia-lesson-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ia-lesson-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--ia-border);
    transition: background var(--ia-transition);
}

.ia-lesson-item:hover {
    background: #fafafa;
}

.ia-lesson-item.completed {
    background: #f0fff4;
}

.ia-lesson-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ia-lesson-icon {
    color: var(--ia-primary);
}

.ia-lesson-title {
    font-size: 0.95rem;
    color: var(--ia-text);
}

.ia-lesson-meta {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ia-lesson-duration {
    font-size: 0.85rem;
    color: var(--ia-text-light);
}

.ia-lesson-preview-badge {
    font-size: 0.75rem;
    padding: 3px 8px;
    background: var(--ia-secondary);
    color: var(--ia-primary);
    border-radius: 4px;
    font-weight: 600;
}

.ia-lesson-lock-icon {
    color: var(--ia-text-light);
}

.ia-lesson-complete-icon {
    color: var(--ia-success);
}

/* =====================================================
   Exams Section
   ===================================================== */
.ia-exams-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #fff8e6 0%, #fffbf0 100%);
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: var(--ia-radius-lg);
}

.ia-exams-section h3 {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    color: var(--ia-primary);
}

.ia-exam-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ia-exam-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.ia-exam-item:last-child {
    border-bottom: none;
}

.ia-exam-info {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ia-text);
}

.ia-exam-meta {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    color: var(--ia-text-light);
}

/* =====================================================
   Instructor Section
   ===================================================== */
.ia-instructor-card {
    display: flex;
    gap: 2rem;
    padding: 1.5rem;
    background: var(--ia-background);
    border-radius: var(--ia-radius-lg);
}

@media (max-width: 600px) {
    .ia-instructor-card {
        flex-direction: column;
        text-align: center;
    }
}

.ia-instructor-avatar-lg img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
}

.ia-instructor-details h3 {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
}

.ia-instructor-bio {
    color: var(--ia-text-light);
    line-height: 1.7;
}

/* =====================================================
   Course Sidebar
   ===================================================== */
.ia-course-sidebar-card {
    background: #fff;
    border-radius: var(--ia-radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    position: sticky;
    top: 100px;
}

.ia-course-preview-video,
.ia-course-preview-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.ia-course-preview-video img,
.ia-course-preview-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ia-video-placeholder {
    position: relative;
    width: 100%;
    height: 100%;
}

.ia-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(0, 0, 0, 0.7);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--ia-transition);
}

.ia-play-btn:hover {
    background: var(--ia-primary);
    transform: translate(-50%, -50%) scale(1.1);
}

.ia-play-btn svg {
    margin-left: 4px;
}

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

.ia-course-sidebar-content {
    padding: 1.5rem;
}

.ia-course-price-display {
    text-align: center;
    margin-bottom: 1rem;
}

.ia-course-price-display .ia-price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--ia-primary);
}

.ia-course-price-display .ia-price.free {
    color: var(--ia-success);
}

/* Progress Bar */
.ia-course-progress {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--ia-background);
    border-radius: var(--ia-radius-md);
}

.ia-progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.ia-progress-percent {
    font-weight: 600;
    color: var(--ia-secondary);
}

.ia-progress-bar {
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.ia-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ia-secondary), #e8c84a);
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* Course Includes */
.ia-course-includes {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--ia-border);
}

.ia-course-includes h4 {
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--ia-text);
}

.ia-course-includes ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ia-course-includes li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--ia-text-light);
}

.ia-course-includes li svg {
    color: var(--ia-primary);
}

/* Share Buttons */
.ia-course-share {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--ia-border);
}

.ia-course-share>span {
    display: block;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--ia-text-light);
}

.ia-share-buttons {
    display: flex;
    gap: 8px;
}

.ia-share-buttons a,
.ia-share-buttons button {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--ia-background);
    border: 1px solid var(--ia-border);
    border-radius: 50%;
    color: var(--ia-text-light);
    transition: all var(--ia-transition);
    cursor: pointer;
}

.ia-share-buttons a:hover,
.ia-share-buttons button:hover {
    background: var(--ia-primary);
    border-color: var(--ia-primary);
    color: #fff;
}

/* =====================================================
   No Curriculum Message
   ===================================================== */
.ia-no-curriculum {
    padding: 2rem;
    text-align: center;
    background: var(--ia-background);
    border-radius: var(--ia-radius-lg);
    color: var(--ia-text-light);
}

/* =====================================================
   Spinner
   ===================================================== */
.ia-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: ia-spin 0.8s linear infinite;
}

@keyframes ia-spin {
    to {
        transform: rotate(360deg);
    }
}

/* =====================================================
   Dark Mode
   ===================================================== */
[data-theme="dark"] .ia-course-tabs {
    border-color: var(--ia-border);
}

[data-theme="dark"] .ia-tab-btn {
    color: var(--ia-text-light);
}

[data-theme="dark"] .ia-tab-btn:hover,
[data-theme="dark"] .ia-tab-btn.active {
    color: var(--ia-secondary);
}

[data-theme="dark"] .ia-outcomes-grid li {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .ia-curriculum-accordion {
    border-color: var(--ia-border);
}

[data-theme="dark"] .ia-curriculum-section {
    border-color: var(--ia-border);
}

[data-theme="dark"] .ia-curriculum-section-header {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .ia-curriculum-section-header:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .ia-curriculum-section-content {
    background: var(--ia-background);
}

[data-theme="dark"] .ia-lesson-item {
    border-color: var(--ia-border);
}

[data-theme="dark"] .ia-lesson-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

[data-theme="dark"] .ia-lesson-item.completed {
    background: rgba(34, 197, 94, 0.1);
}

[data-theme="dark"] .ia-exams-section {
    background: rgba(212, 175, 55, 0.1);
    border-color: rgba(212, 175, 55, 0.2);
}

[data-theme="dark"] .ia-exam-item {
    border-color: rgba(212, 175, 55, 0.15);
}

[data-theme="dark"] .ia-instructor-card {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .ia-course-sidebar-card {
    background: var(--ia-card-bg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .ia-course-progress {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .ia-progress-bar {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .ia-course-includes li {
    color: var(--ia-text-light);
}

[data-theme="dark"] .ia-share-buttons a,
[data-theme="dark"] .ia-share-buttons button {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--ia-border);
}

[data-theme="dark"] .ia-no-curriculum {
    background: rgba(255, 255, 255, 0.05);
}

/* =====================================================
   RTL Support
   ===================================================== */
[dir="rtl"] .ia-course-hero-meta {
    flex-direction: row-reverse;
}

[dir="rtl"] .ia-meta-item svg {
    order: 2;
}

[dir="rtl"] .ia-curriculum-section-header {
    flex-direction: row-reverse;
}

[dir="rtl"] .ia-section-info {
    flex-direction: row-reverse;
}

[dir="rtl"] .ia-lesson-item {
    flex-direction: row-reverse;
}

[dir="rtl"] .ia-lesson-info,
[dir="rtl"] .ia-lesson-meta {
    flex-direction: row-reverse;
}

[dir="rtl"] .ia-exam-item {
    flex-direction: row-reverse;
}

[dir="rtl"] .ia-share-buttons {
    flex-direction: row-reverse;
}

/* =====================================================
   Dashboard Enrolled Courses
   ===================================================== */
.ia-enrolled-courses {
    margin-bottom: 2rem;
}

.ia-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.ia-card-header h3 {
    margin: 0;
}

.ia-view-all {
    font-size: 0.9rem;
    color: var(--ia-primary);
    text-decoration: none;
    font-weight: 500;
}

.ia-view-all:hover {
    color: var(--ia-secondary);
}

.ia-courses-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.ia-enrolled-course-card {
    display: flex;
    gap: 1.25rem;
    padding: 1rem;
    background: var(--ia-background);
    border-radius: var(--ia-radius-md);
    transition: all var(--ia-transition);
}

.ia-enrolled-course-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.ia-enrolled-course-card .ia-course-thumb {
    width: 140px;
    height: 100px;
    flex-shrink: 0;
    border-radius: var(--ia-radius-sm);
    overflow: hidden;
    position: relative;
}

.ia-enrolled-course-card .ia-course-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ia-enrolled-course-card .ia-no-thumb {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #e8e8e8 0%, #d0d0d0 100%);
    color: #999;
}

.ia-enrolled-course-card .ia-completed-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--ia-success);
    color: #fff;
    border-radius: 50%;
}

.ia-enrolled-course-card .ia-course-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.ia-course-meta-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.ia-category-tag {
    font-size: 0.75rem;
    padding: 3px 8px;
    background: rgba(212, 175, 55, 0.15);
    color: #b8860b;
    border-radius: 4px;
    font-weight: 600;
}

.ia-lesson-count {
    font-size: 0.8rem;
    color: var(--ia-text-light);
}

.ia-enrolled-course-card .ia-course-title {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    line-height: 1.4;
}

.ia-enrolled-course-card .ia-course-title a {
    color: var(--ia-text);
    text-decoration: none;
}

.ia-enrolled-course-card .ia-course-title a:hover {
    color: var(--ia-primary);
}

.ia-progress-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.ia-progress-section .ia-progress-bar {
    flex: 1;
    height: 6px;
}

.ia-progress-text {
    font-size: 0.8rem;
    color: var(--ia-text-light);
    white-space: nowrap;
}

.ia-btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

/* Empty State */
.ia-no-courses {
    text-align: center;
    padding: 3rem 2rem;
}

.ia-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.ia-empty-state svg {
    color: var(--ia-text-light);
    opacity: 0.5;
}

.ia-empty-state h4 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--ia-text);
}

.ia-empty-state p {
    margin: 0;
    color: var(--ia-text-light);
    max-width: 300px;
}

/* Responsive */
@media (max-width: 600px) {
    .ia-enrolled-course-card {
        flex-direction: column;
    }

    .ia-enrolled-course-card .ia-course-thumb {
        width: 100%;
        height: 140px;
    }
}

/* Dark Mode - Dashboard Courses */
[data-theme="dark"] .ia-enrolled-course-card {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .ia-enrolled-course-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .ia-enrolled-course-card .ia-no-thumb {
    background: linear-gradient(135deg, #1a3a5c 0%, #122a4a 100%);
    color: #9ca3af;
}

[data-theme="dark"] .ia-category-tag {
    background: rgba(212, 175, 55, 0.2);
    color: var(--ia-secondary);
}

[data-theme="dark"] .ia-enrolled-course-card .ia-course-title a {
    color: #fff;
}

[data-theme="dark"] .ia-enrolled-course-card .ia-course-title a:hover {
    color: var(--ia-secondary);
}

[data-theme="dark"] .ia-empty-state h4 {
    color: #fff;
}

/* =====================================================
   Course Player Styles
   ===================================================== */
.ia-player-layout {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: #f5f7fa;
}

/* Dark mode background - use hardcoded color and higher specificity to bypass 
   variables that are being overridden by style.css defaults */
html[data-theme="dark"] .ia-player-layout {
    background-color: #0a1628 !important;
}

/* Player Header - Updated for responsive design */
.ia-player-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--ia-primary);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
}

[data-theme="dark"] .ia-player-header {
    background: #0d1e36;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

/* Override for responsive header */
.ia-player-header.ia-responsive-header {
    justify-content: flex-start;
}

.ia-back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.ia-back-btn:hover {
    color: #fff;
}

.ia-course-name {
    font-weight: 600;
    font-size: 1rem;
}

.ia-player-progress {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.ia-progress-bar-mini {
    width: 100px;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    overflow: hidden;
}

.ia-progress-bar-mini .ia-progress-fill {
    height: 100%;
    background: var(--ia-secondary);
    border-radius: 3px;
}

/* Content Layout */
.ia-player-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr var(--ia-sidebar-max-width);
}

[data-theme="dark"] .ia-player-content,
html[data-theme="dark"] .ia-player-content {
    background-color: #0a1628 !important;
}

@media (max-width: 1024px) {
    .ia-player-content {
        grid-template-columns: 1fr;
    }

    .ia-player-sidebar {
        position: fixed;
        right: calc(-1 * var(--ia-sidebar-max-width));
        top: 0;
        height: 100vh;
        height: 100dvh;
        width: var(--ia-sidebar-width-mobile);
        max-width: var(--ia-sidebar-max-width);
        transition: right 0.3s ease;
        z-index: 200;
    }

    .ia-player-sidebar.open {
        right: 0;
    }
}

/* Main Area - ensure background fills the full column height on desktop */
.ia-player-main {
    background: #fff;
    min-height: calc(100vh - 60px);
}

/* On desktop the grid creates two columns; ensure player-main background
   always fills its column so no white bleeds through on desktop */
@media (min-width: 1025px) {
    .ia-player-main {
        min-height: 100%;
    }

    .ia-player-content {
        align-items: stretch;
    }
}

html[data-theme="dark"] .ia-player-main {
    background-color: #0d1e36 !important;
    color: #f0f0f0 !important;
}

[data-theme="dark"] .ia-player-main .ia-lesson-title {
    color: #ffffff;
}

[data-theme="dark"] .ia-player-main .ia-lesson-description,
[data-theme="dark"] .ia-player-main .ia-lesson-content,
[data-theme="dark"] .ia-player-main .ia-text-content {
    color: var(--ia-text, #f0f0f0);
}

[data-theme="dark"] .ia-player-main .ia-lesson-description p,
[data-theme="dark"] .ia-player-main .ia-lesson-description span,
[data-theme="dark"] .ia-player-main .ia-lesson-description div,
[data-theme="dark"] .ia-player-main .ia-lesson-description li,
[data-theme="dark"] .ia-player-main .ia-lesson-content p,
[data-theme="dark"] .ia-player-main .ia-lesson-content span,
[data-theme="dark"] .ia-player-main .ia-lesson-content div,
[data-theme="dark"] .ia-player-main .ia-lesson-content li,
[data-theme="dark"] .ia-player-main .ia-text-content p,
[data-theme="dark"] .ia-player-main .ia-text-content span,
[data-theme="dark"] .ia-player-main .ia-text-content div,
[data-theme="dark"] .ia-player-main .ia-text-content li {
    color: var(--ia-text, #f0f0f0);
}

[data-theme="dark"] .ia-player-main .ia-lesson-description h1,
[data-theme="dark"] .ia-player-main .ia-lesson-description h2,
[data-theme="dark"] .ia-player-main .ia-lesson-description h3,
[data-theme="dark"] .ia-player-main .ia-lesson-description h4,
[data-theme="dark"] .ia-player-main .ia-lesson-content h1,
[data-theme="dark"] .ia-player-main .ia-lesson-content h2,
[data-theme="dark"] .ia-player-main .ia-lesson-content h3,
[data-theme="dark"] .ia-player-main .ia-lesson-content h4 {
    color: #ffffff;
}

/* Video Container */
.ia-video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
}

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

/* Text Content */
.ia-text-content {
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

/* Lesson Info in Player */
.ia-player-main .ia-lesson-info {
    padding: 1.5rem 2rem;
    display: block;
    /* Override flex from base .ia-lesson-info */
}

.ia-player-main .ia-lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--ia-border);
}

.ia-player-main .ia-lesson-title {
    margin: 0 0 0.5rem;
    font-size: 1.5rem;
}

.ia-lesson-duration {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--ia-text-light);
}

.ia-completed-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    border-radius: var(--ia-radius-md);
    font-weight: 600;
}

/* Navigation */
.ia-lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--ia-border);
}

.ia-nav-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 1rem 1.5rem;
    background: var(--ia-background, #ffffff);
    border: 2px solid var(--ia-border, #e0e0e0);
    border-radius: var(--ia-radius-md, 8px);
    text-decoration: none;
    color: var(--ia-text, #333333);
    transition: all 0.2s;
    font-weight: 500;
}

.ia-nav-btn:hover {
    background: var(--ia-primary, #002147);
    color: #ffffff;
    border-color: var(--ia-primary, #002147);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 33, 71, 0.15);
}

.ia-nav-btn:focus {
    outline: 2px solid var(--ia-secondary, #D4AF37);
    outline-offset: 2px;
    background: var(--ia-primary, #002147);
    color: #ffffff;
    border-color: var(--ia-primary, #002147);
}

.ia-nav-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 33, 71, 0.1);
}

.ia-nav-btn span {
    display: flex;
    flex-direction: column;
}

.ia-nav-btn small {
    font-size: 0.75rem;
    opacity: 0.7;
    font-weight: 400;
}

.ia-nav-btn.ia-next {
    text-align: right;
}

.ia-nav-btn.ia-finish {
    background: linear-gradient(135deg, var(--ia-secondary, #D4AF37), #e8c84a);
    color: var(--ia-primary, #002147);
    border-color: var(--ia-secondary, #D4AF37);
    font-weight: 600;
}

.ia-nav-btn.ia-finish:hover {
    background: linear-gradient(135deg, #e8c84a, var(--ia-secondary, #D4AF37));
    color: var(--ia-primary, #002147);
    border-color: #e8c84a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

/* Dark theme specific styles for nav buttons
   In dark mode, card-bg (#0d1e36) matches the page background exactly,
   so we use a lighter shade to make the button visible */
[data-theme="dark"] .ia-nav-btn {
    background: #122a4a;
    color: #e0e8f0;
    border-color: #2a4a6e;
}

[data-theme="dark"] .ia-nav-btn:hover {
    background: var(--ia-secondary, #E5C158);
    color: #002147;
    border-color: var(--ia-secondary, #E5C158);
    box-shadow: 0 4px 12px rgba(229, 193, 88, 0.25);
}

[data-theme="dark"] .ia-nav-btn:focus {
    outline: 2px solid var(--ia-secondary, #E5C158);
    outline-offset: 2px;
    background: var(--ia-secondary, #E5C158);
    color: #002147;
    border-color: var(--ia-secondary, #E5C158);
}

[data-theme="dark"] .ia-nav-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(229, 193, 88, 0.15);
}

[data-theme="dark"] .ia-nav-btn.ia-finish {
    background: linear-gradient(135deg, var(--ia-secondary, #E5C158), #e8c84a);
    color: #002147;
    border-color: var(--ia-secondary, #E5C158);
}

[data-theme="dark"] .ia-nav-btn.ia-finish:hover {
    background: linear-gradient(135deg, #e8c84a, var(--ia-secondary, #E5C158));
    color: #002147;
    border-color: #e8c84a;
}

/* Mobile responsive navigation buttons */
@media (max-width: 768px) {
    .ia-nav-btn {
        padding: 0.875rem 1.25rem;
        font-size: 0.9rem;
        min-height: 44px;
        /* Minimum touch target size */
        border-width: 1px;
    }

    .ia-nav-btn small {
        font-size: 0.7rem;
    }

    .ia-nav-btn svg {
        width: 18px;
        height: 18px;
    }

    /* Ensure proper spacing on mobile */
    .ia-lesson-navigation {
        gap: 12px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .ia-nav-btn {
        border-width: 2px;
        font-weight: 600;
    }

    .ia-nav-btn:hover {
        border-width: 3px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .ia-nav-btn {
        transition: none;
    }

    .ia-nav-btn:hover {
        transform: none;
    }
}

/* =====================================================
   Inline Course Content Section (mobile accordion)
   ===================================================== */

/* Base — shown on mobile, hidden on desktop (via media query above) */
.ia-course-content-section {
    margin-top: 2rem;
    border-top: 1px solid var(--ia-border, #e0e0e0);
    background: var(--ia-background, #f5f7fa);
}

.ia-course-content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    cursor: pointer;
    user-select: none;
    background: var(--ia-background, #f5f7fa);
    border-bottom: 1px solid transparent;
    transition: background 0.2s;
}

.ia-course-content-header:hover {
    background: var(--ia-card-bg, #eef0f3);
}

.ia-course-content-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--ia-text, #1a1a1a);
}

.ia-course-content-count {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--ia-text-light, #666);
    margin-left: 0.25rem;
}

.ia-course-content-chevron {
    color: var(--ia-text-light, #666);
    transition: transform 0.25s ease;
    flex-shrink: 0;
}

.ia-course-content-section.open .ia-course-content-chevron {
    transform: rotate(180deg);
}

/* The collapsible list */
.ia-course-content-list {
    background: var(--ia-background, #f5f7fa);
    overflow: hidden;
}

/* Lesson list */
.ia-inline-lessons {
    list-style: none;
    margin: 0;
    padding: 0;
}

.ia-inline-lessons li {
    border-bottom: 1px solid var(--ia-border, #e0e0e0);
}

.ia-inline-lessons li a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.5rem;
    text-decoration: none;
    color: var(--ia-text, #1a1a1a);
    font-size: 0.9rem;
    transition: background 0.15s;
}

.ia-inline-lessons li a:hover {
    background: var(--ia-card-bg, #e8eaee);
}

.ia-inline-lessons li.active a {
    background: rgba(229, 193, 88, 0.12);
    font-weight: 600;
}

.ia-inline-lessons li.completed a {
    color: var(--ia-text-light, #555);
}

.ia-inline-lessons li.locked a {
    color: var(--ia-text-light, #999);
    cursor: not-allowed;
}

.ia-lesson-status {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.ia-lesson-name {
    flex: 1;
    line-height: 1.4;
}

.ia-lesson-time {
    font-size: 0.8rem;
    color: var(--ia-text-light, #666);
    white-space: nowrap;
    flex-shrink: 0;
}

/* Exams divider */
.ia-inline-exams-divider {
    padding: 0.6rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ia-text-light, #777);
    background: var(--ia-card-bg, #eef0f3);
    border-top: 1px solid var(--ia-border, #e0e0e0);
    border-bottom: 1px solid var(--ia-border, #e0e0e0);
}

/* ── Dark mode ── */
[data-theme="dark"] .ia-course-content-section {
    background: var(--ia-card-bg, #0d1e36);
    border-top-color: var(--ia-border, #1a3a5c);
}

[data-theme="dark"] .ia-course-content-header {
    background: var(--ia-card-bg, #0d1e36);
}

[data-theme="dark"] .ia-course-content-header:hover {
    background: #122a4a;
}

[data-theme="dark"] .ia-course-content-header h3 {
    color: #ffffff;
}

[data-theme="dark"] .ia-course-content-count {
    color: #8899aa;
}

[data-theme="dark"] .ia-course-content-chevron {
    color: #8899aa;
}

[data-theme="dark"] .ia-course-content-list {
    background: var(--ia-card-bg, #0d1e36);
}

[data-theme="dark"] .ia-inline-lessons li {
    border-bottom-color: var(--ia-border, #1a3a5c);
}

[data-theme="dark"] .ia-inline-lessons li a {
    color: #e0e8f0;
}

[data-theme="dark"] .ia-inline-lessons li a:hover {
    background: #122a4a;
}

[data-theme="dark"] .ia-inline-lessons li.active a {
    background: rgba(229, 193, 88, 0.15);
    color: #ffffff;
}

[data-theme="dark"] .ia-inline-lessons li.completed a {
    color: #8899aa;
}

[data-theme="dark"] .ia-inline-lessons li.locked a {
    color: #4a6080;
}

html[data-theme="dark"] .ia-lesson-time {
    color: #a0b0c0 !important;
}

html[data-theme="dark"] .ia-inline-exams-divider {
    color: #ccd6e0 !important;
    background: #11223a !important;
    border-color: #1a3a5c !important;
}

/* Player Sidebar */
.ia-player-sidebar {
    background: #fff;
    border-left: 1px solid var(--ia-border);
    overflow-y: auto;
    /* Base height for mobile (60px header) */
    height: calc(100vh - 60px);
    position: sticky;
    top: 60px;
}

@media (min-width: 1025px) {
    .ia-player-sidebar {
        /* Adjusted height/top for desktop (80px header) */
        height: calc(100vh - 80px);
        top: 80px;
    }
}

html[data-theme="dark"] .ia-player-sidebar {
    background-color: #0d1e36 !important;
    border-color: #1a3a5c !important;
}

/* Force dark backgrounds for internal components to prevent bleed */
html[data-theme="dark"] .ia-sidebar-header,
html[data-theme="dark"] .ia-sidebar-section-header {
    background-color: #0d1e36 !important;
}

/* Sidebar text contrast - force white for maximum visibility on all desktop layouts */
html[data-theme="dark"] .ia-player-sidebar .ia-sidebar-header h3,
html[data-theme="dark"] .ia-player-sidebar .ia-sidebar-section-header,
html[data-theme="dark"] .ia-sidebar-lessons li a,
html[data-theme="dark"] .ia-sidebar-lessons li .ia-lesson-name,
html[data-theme="dark"] .ia-section-title {
    color: #ffffff !important;
}

html[data-theme="dark"] .ia-sidebar-lessons li.completed .ia-lesson-name {
    color: #a0b0c0 !important;
}

html[data-theme="dark"] .ia-sidebar-lessons li.locked .ia-lesson-name,
html[data-theme="dark"] .ia-sidebar-lessons li.locked a {
    color: #4a6080 !important;
}

html[data-theme="dark"] .ia-lesson-time {
    color: #a0b0c0 !important;
}

/* Player Control Bar Dark Mode */
html[data-theme="dark"] .ia-language-controls {
    background-color: #0b1a30 !important;
    /* Stay blue in dark mode */
    border-bottom-color: #152d4c !important;
}

html[data-theme="dark"] .ia-control-btn {
    background-color: #162f50 !important;
    /* Stand out slightly against the bar */
    border-color: #1e3a5f !important;
    color: #e0e8f0 !important;
}

html[data-theme="dark"] .ia-control-btn:hover {
    background-color: #1c3c66 !important;
    color: #ffffff !important;
    border-color: #264b7d !important;
}

html[data-theme="dark"] .ia-control-btn.active {
    background-color: #244b7d !important;
    color: #ffffff !important;
    border-color: #3162a3 !important;
}

.ia-sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--ia-border);
    position: sticky;
    top: 0;
    background: #fff;
    z-index: 10;
}

[data-theme="dark"] .ia-sidebar-header {
    background: var(--ia-card-bg);
}

.ia-sidebar-header h3 {
    margin: 0;
    font-size: 1rem;
}

.ia-toggle-sidebar {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--ia-text-light);
}

@media (max-width: 1024px) {
    .ia-toggle-sidebar {
        display: block;
    }
}

.ia-sidebar-content {
    padding: 0.5rem 0;
}

.ia-sidebar-section {
    margin-bottom: 0.5rem;
}

.ia-sidebar-section-header {
    padding: 0.75rem 1.25rem;
    background: var(--ia-background);
}

[data-theme="dark"] .ia-sidebar-section-header {
    background: rgba(255, 255, 255, 0.05);
}

.ia-sidebar-lessons {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ia-sidebar-lessons li {
    border-bottom: 1px solid var(--ia-border);
}

.ia-sidebar-lessons li:last-child {
    border-bottom: none;
}

.ia-sidebar-lessons li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.875rem 1.25rem;
    text-decoration: none;
    color: var(--ia-text);
    transition: background 0.2s;
}

.ia-sidebar-lessons li a:hover {
    background: var(--ia-background);
}

[data-theme="dark"] .ia-sidebar-lessons li a:hover {
    background: rgba(255, 255, 255, 0.05);
}

.ia-sidebar-lessons li.active a {
    background: rgba(212, 175, 55, 0.1);
    border-left: 3px solid var(--ia-secondary);
}

.ia-sidebar-lessons li.completed .ia-lesson-name {
    color: var(--ia-text-light);
}

.ia-lesson-status {
    flex-shrink: 0;
}

.ia-lesson-name {
    flex: 1;
    font-size: 0.9rem;
}

.ia-lesson-time {
    font-size: 0.8rem;
    color: var(--ia-text-light);
}

/* Exams section in sidebar */
.ia-exams-section .ia-sidebar-section-header {
    background: rgba(212, 175, 55, 0.1);
}

/* Mobile sidebar toggle button */
.ia-mobile-sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: var(--ia-primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    z-index: 150;
}

@media (max-width: 1024px) {
    .ia-mobile-sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* No lesson message */
.ia-no-lesson-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    min-height: 60vh;
}

.ia-no-lesson-message svg {
    color: var(--ia-text-light);
    opacity: 0.4;
    margin-bottom: 1.5rem;
}

.ia-no-lesson-message h2 {
    margin: 0 0 0.5rem;
    font-size: 1.5rem;
}

.ia-no-lesson-message p {
    margin: 0 0 1.5rem;
    color: var(--ia-text-light);
}

/* Sidebar empty state */
.ia-sidebar-empty {
    padding: 2rem 1.25rem;
    text-align: center;
    color: var(--ia-text-light);
}

/* ==========================================================================
   COLOR PICKER UTILITIES
   ========================================================================== */

/* Common color picker button styles */
.ia-color-btn {
    width: 32px;
    height: 32px;
    border: 2px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ia-color-btn:hover {
    transform: scale(1.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.ia-color-btn.active {
    border-color: #fff;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.3);
}

/* Transparent color button */
.ia-color-transparent {
    background: linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 8px 8px;
    background-position: 0 0, 0 4px, 4px -4px, -4px 0px;
}

/* Predefined color classes for common colors */
.ia-color-white {
    background: #FFFFFF;
}

.ia-color-yellow {
    background: #FFFF00;
}

.ia-color-green {
    background: #00FF00;
}

.ia-color-cyan {
    background: #00FFFF;
}

.ia-color-magenta {
    background: #FF00FF;
}

.ia-color-red {
    background: #FF0000;
}

.ia-color-black {
    background: #000000;
}

.ia-color-semi-transparent {
    background: rgba(0, 0, 0, 0.5);
}

.ia-color-dark {
    background: rgba(0, 0, 0, 0.75);
}

.ia-color-light {
    background: rgba(255, 255, 255, 0.5);
}

/* =====================================================
   Course Player Mobile Styles
   ===================================================== */

/* Mobile Dropdown Backdrop */
.ia-dropdown-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: var(--ia-z-modal);
    opacity: 0;
    transition: opacity var(--ia-transition-normal);
}

.ia-dropdown-backdrop.visible {
    display: block;
    opacity: 1;
}

/* Language Controls Optimization */
.ia-language-controls {
    display: flex;
    flex-wrap: wrap;
    /* Wrap buttons instead of horizontal scrolling */
    justify-content: center;
    align-items: center;
    padding: 12px var(--ia-mobile-padding);
    gap: 8px;
    /* Compact gap */
    background: #f0f4f8;
    /* Stay grey in light mode as requested */
    border-bottom: 1px solid var(--ia-border, #e0e0e0);
    width: 100%;
    box-sizing: border-box;
}

.ia-control-group {
    flex-shrink: 0;
    position: relative;
}

.ia-control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    /* Compact padding */
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    /* Sleeker rounded corners */
    cursor: pointer;
    font-size: 0.85rem;
    /* Compact font size */
    font-weight: 500;
    color: var(--ia-text, #333);
    transition: all 0.2s ease;
    user-select: none;
    white-space: nowrap;
}

.ia-control-btn:hover {
    background: var(--ia-primary, #002147);
    color: #fff;
    border-color: var(--ia-primary, #002147);
}

.ia-control-btn:hover svg {
    stroke: #fff;
}

.ia-control-btn.active {
    background: var(--ia-primary, #002147);
    color: #fff;
    border-color: var(--ia-primary, #002147);
}

/* Disabled state */
.ia-control-group.disabled {
    opacity: 0.4;
}

.ia-control-group.disabled .ia-control-btn {
    cursor: not-allowed;
}

.ia-control-group.disabled .ia-control-btn:hover {
    background: #ffffff;
    color: var(--ia-text, #333);
    border-color: #e2e8f0;
}

/* Desktop styles */
@media (min-width: 768px) {
    .ia-control-btn {
        font-size: 0.9rem;
        padding: 10px 16px;
    }

    .ia-language-controls {
        padding: 12px 24px;
        gap: 12px;
    }
}

/* Mobile FAB (Floating Action Button) styles */
.ia-mobile-fab-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: var(--ia-z-header);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ia-mobile-fab {
    width: var(--ia-touch-target);
    height: var(--ia-touch-target);
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all var(--ia-transition-normal);
    position: relative;
}

.ia-mobile-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.ia-fab-lessons {
    background: var(--ia-primary, #002147);
    color: #fff;
}

.ia-fab-notes {
    background: var(--ia-secondary, #D4AF37);
    color: var(--ia-primary, #002147);
}

/* Hide FABs on desktop */
@media (min-width: 1025px) {
    .ia-mobile-fab-container {
        display: none;
    }
}

/* Video Container Responsive */
.ia-video-container {
    position: relative;
    width: 100%;
    max-width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    overflow: hidden;
    /* Ensure proper containment */
    contain: layout style paint;
}

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

.ia-video-wrapper iframe,
.ia-video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    /* Prevent any overflow */
    max-width: 100%;
    max-height: 100%;
}

/* Handle orientation changes gracefully */
@media screen and (orientation: landscape) and (max-height: 500px) {
    .ia-video-container {
        /* Adjust for landscape mobile viewing */
        aspect-ratio: 16/9;
        max-height: 70vh;
    }
}

@media screen and (orientation: portrait) and (max-width: 768px) {
    .ia-video-container {
        /* Optimize for portrait mobile viewing */
        aspect-ratio: 16/9;
        max-height: 40vh;
    }
}

/* Fallback for browsers without aspect-ratio */
@supports not (aspect-ratio: 16/9) {
    .ia-video-container {
        position: relative;
        width: 100%;
        padding-bottom: 56.25%;
        /* 16:9 aspect ratio */
        height: 0;
    }

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

/* Enhanced responsive behavior for different screen sizes */
@media (max-width: 480px) {
    .ia-video-container {
        /* Smaller screens get more compact video */
        aspect-ratio: 16/9;
        max-height: 35vh;
    }
}

@media (min-width: 1200px) {
    .ia-video-container {
        /* Larger screens can have bigger video */
        max-height: none;
    }
}

/* Picture-in-Picture support */
.ia-video-container video::-webkit-media-controls-panel {
    display: flex !important;
    opacity: 1 !important;
}

/* Subtitle overlay positioning */
.ia-subtitle-overlay {
    position: absolute;
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100 !important;
    pointer-events: none;
    max-width: 90%;
    text-align: center;
    display: block !important;
    opacity: 0;
    transition: opacity 0.15s;
}

.ia-subtitle-overlay.visible {
    opacity: 1;
}

/* Responsive subtitle overlay */
@media (max-width: 768px) {
    .ia-subtitle-overlay {
        bottom: 12%;
        max-width: 95%;
        font-size: 1rem;
        padding: 8px 16px;
        background: rgba(0, 0, 0, 0.7);
        border-radius: 4px;
    }

    /* Ensure overlay is above video iframe on mobile */
    .ia-video-container {
        position: relative;
    }

    .ia-video-container .ia-subtitle-overlay {
        position: absolute;
        z-index: 100 !important;
    }

    .ia-video-container iframe,
    .ia-video-container video {
        z-index: 1;
        position: relative;
    }
}

@media (orientation: landscape) and (max-height: 500px) {
    .ia-subtitle-overlay {
        bottom: 5%;
        font-size: 0.8rem;
    }
}

/* Toast Notifications */
#ia-toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: calc(var(--ia-z-modal) + 1);
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.ia-toast {
    background: #fff;
    border-radius: var(--ia-radius-desktop);
    padding: 16px 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border-left: 4px solid var(--ia-primary, #002147);
    min-width: 300px;
    max-width: 400px;
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--ia-transition-slow);
    pointer-events: auto;
}

.ia-toast.show {
    transform: translateX(0);
    opacity: 1;
}

.ia-toast.success {
    border-left-color: #10b981;
}

.ia-toast.error {
    border-left-color: #ef4444;
}

.ia-toast.warning {
    border-left-color: #f59e0b;
}

.ia-toast.info {
    border-left-color: var(--ia-secondary, #D4AF37);
}

.ia-toast.milestone {
    background: linear-gradient(135deg, var(--ia-secondary, #D4AF37), #e8c84a);
    color: var(--ia-primary, #002147);
    border-left-color: var(--ia-primary, #002147);
}

[data-theme="dark"] .ia-toast {
    background: var(--ia-card-bg, #0d1e36);
    color: var(--ia-text, #f0f0f0);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

@media (max-width: 768px) {
    #ia-toast-container {
        top: 70px;
        right: 10px;
        left: 10px;
    }

    .ia-toast {
        min-width: auto;
        max-width: none;
    }
}

/* =====================================================
   Horizontal Scroll Prevention
   ===================================================== */

/* Ensure no element can cause horizontal scroll */
.ia-course-player-page {
    overflow-x: hidden;
}

.ia-player-layout {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

.ia-player-main {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

/* Ensure all containers respect viewport width */
.ia-lesson-content,
.ia-lesson-info,
.ia-lesson-navigation {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* Prevent any child elements from overflowing */
.ia-lesson-content>*,
.ia-lesson-info>*,
.ia-lesson-navigation>* {
    max-width: 100%;
    box-sizing: border-box;
}

/* Responsive images and media */
.ia-lesson-content img,
.ia-lesson-content video,
.ia-lesson-content iframe {
    max-width: 100%;
    height: auto;
}

/* Ensure text content doesn't overflow */
.ia-lesson-content p,
.ia-lesson-content div,
.ia-lesson-content span {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Mobile-specific overflow prevention */
@media (max-width: 768px) {
    body.ia-course-player-page {
        overflow-x: hidden;
    }

    .ia-player-content {
        width: 100vw;
        max-width: 100vw;
        overflow-x: hidden;
    }

    /* Ensure sidebar doesn't cause overflow when closed */
    .ia-player-sidebar {
        right: calc(-1 * var(--ia-sidebar-width-mobile));
    }

    .ia-player-sidebar.open {
        right: 0;
    }
}

/* Landscape mode specific styles */
.ia-video-container.landscape-mode {
    max-height: 70vh;
    margin: 0 auto;
}

.ia-video-container.landscape-mode .ia-subtitle-overlay {
    bottom: 5%;
    font-size: 0.8rem;
}

/* Fullscreen video support */
.ia-video-container:-webkit-full-screen {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    aspect-ratio: auto;
}

.ia-video-container:-moz-full-screen {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    aspect-ratio: auto;
}

.ia-video-container:fullscreen {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    aspect-ratio: auto;
}

/* Enhanced mobile video controls */
@media (max-width: 768px) {
    .ia-video-container video::-webkit-media-controls-panel {
        padding: 8px;
    }

    .ia-video-container video::-webkit-media-controls-play-button {
        min-width: 44px;
        min-height: 44px;
    }

    .ia-video-container video::-webkit-media-controls-fullscreen-button {
        min-width: 44px;
        min-height: 44px;
    }
}

/* =====================================================
   Enhanced Mobile Sidebar System
   ===================================================== */

/* Sidebar backdrop overlay */
.ia-sidebar-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--ia-z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--ia-transition-normal);
    backdrop-filter: blur(2px);
}

.ia-sidebar-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* Enhanced sidebar for mobile */
@media (max-width: 1024px) {
    .ia-player-sidebar {
        position: fixed;
        top: 0;
        right: calc(-1 * var(--ia-sidebar-width-mobile));
        width: var(--ia-sidebar-width-mobile);
        max-width: var(--ia-sidebar-max-width);
        height: 100vh;
        height: 100dvh;
        background: var(--ia-bg, #ffffff);
        z-index: var(--ia-z-sidebar);
        transition: right var(--ia-transition-slow);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .ia-player-sidebar.open {
        right: 0;
    }

    /* Sidebar header with close button */
    .ia-sidebar-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: var(--ia-mobile-padding);
        border-bottom: 1px solid var(--ia-border, #e0e0e0);
        background: var(--ia-card-bg, #f8f9fa);
        position: sticky;
        top: 0;
        z-index: 1;
    }

    .ia-sidebar-close {
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--ia-text-muted, #666);
        cursor: pointer;
        padding: 8px;
        border-radius: var(--ia-radius-mobile);
        transition: all var(--ia-transition-normal);
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .ia-sidebar-close:hover {
        background: var(--ia-border, #e0e0e0);
        color: var(--ia-text, #333);
    }
}

/* Dark theme sidebar */
[data-theme="dark"] .ia-player-sidebar {
    background: var(--ia-card-bg, #1a1a1a);
    border-left: 1px solid var(--ia-border, #333);
}

[data-theme="dark"] .ia-sidebar-header {
    background: var(--ia-bg, #0f0f0f);
    border-bottom-color: var(--ia-border, #333);
}

/* Sidebar content styling */
.ia-sidebar-content {
    padding: 0;
}

.ia-sidebar-section {
    margin-bottom: 0;
}

.ia-sidebar-section h4 {
    padding: 12px var(--ia-mobile-padding);
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ia-text-muted, #666);
    background: var(--ia-card-bg, #f8f9fa);
    border-bottom: 1px solid var(--ia-border, #e0e0e0);
}

/* Lesson items in sidebar */
.ia-lesson-item {
    display: flex;
    align-items: center;
    padding: 12px var(--ia-mobile-padding);
    border-bottom: 1px solid var(--ia-border, #e0e0e0);
    text-decoration: none;
    color: var(--ia-text, #333);
    transition: background-color var(--ia-transition-normal);
    min-height: var(--ia-touch-target);
}

.ia-lesson-item:hover {
    background: var(--ia-card-bg, #f8f9fa);
}

.ia-lesson-item.current {
    background: var(--ia-primary, #002147);
    color: #ffffff;
}

.ia-lesson-item.completed {
    background: var(--ia-success-bg, #f0f9ff);
    color: var(--ia-success, #10b981);
}

/* Lesson item content */
.ia-lesson-number {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--ia-border, #e0e0e0);
    color: var(--ia-text-muted, #666);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 12px;
}

.ia-lesson-item.current .ia-lesson-number {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.ia-lesson-item.completed .ia-lesson-number {
    background: var(--ia-success, #10b981);
    color: #ffffff;
}

.ia-lesson-title {
    flex: 1;
    font-size: 0.9rem;
    line-height: 1.4;
}

.ia-lesson-duration {
    flex-shrink: 0;
    font-size: 0.8rem;
    color: var(--ia-text-muted, #666);
    margin-left: 8px;
}

/* Mobile sidebar toggle button */
.ia-mobile-sidebar-toggle {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    width: var(--ia-touch-target);
    height: var(--ia-touch-target);
    border-radius: 50%;
    background: var(--ia-primary, #002147);
    color: #ffffff;
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 33, 71, 0.15);
    transition: all var(--ia-transition-normal);
    z-index: calc(var(--ia-z-header) + 1);
}

.ia-mobile-sidebar-toggle:hover {
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 33, 71, 0.2);
}

@media (max-width: 1024px) {
    .ia-mobile-sidebar-toggle {
        display: flex;
    }
}

/* Hide toggle when sidebar is open */
.ia-player-sidebar.open~.ia-mobile-sidebar-toggle {
    opacity: 0;
    pointer-events: none;
}

/* Smooth animations */
@media (prefers-reduced-motion: reduce) {

    .ia-player-sidebar,
    .ia-sidebar-backdrop,
    .ia-mobile-sidebar-toggle {
        transition: none;
    }
}

/* =====================================================
   Touch Target Optimization
   ===================================================== */

/* Ensure all interactive elements meet 44x44px minimum */
@media (max-width: 768px) {

    /* Buttons and links */
    button,
    .ia-btn,
    .ia-control-btn,
    .ia-nav-btn,
    .ia-mobile-fab,
    .ia-sidebar-close,
    .ia-mobile-sidebar-toggle,
    .ia-reset-course-btn,
    .ia-back-btn {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Dropdown items */
    .ia-dropdown-item,
    .ia-speed-option,
    .ia-subtitle-option,
    .ia-audio-option {
        min-height: var(--ia-touch-target);
        padding: 12px 16px;
    }

    /* Lesson navigation items */
    .ia-lesson-item,
    .ia-lesson-link {
        min-height: var(--ia-touch-target);
        padding: 12px var(--ia-mobile-padding);
    }

    /* Form elements */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    textarea,
    select {
        min-height: var(--ia-touch-target);
        padding: 12px 16px;
    }

    /* Checkbox and radio buttons */
    input[type="checkbox"],
    input[type="radio"] {
        min-width: 20px;
        min-height: 20px;
        margin: 12px;
    }

    /* Custom checkbox/radio labels */
    .ia-checkbox-label,
    .ia-radio-label {
        min-height: var(--ia-touch-target);
        padding: 12px 0;
        display: flex;
        align-items: center;
    }

    /* Tab buttons */
    .ia-subtitle-tab,
    .ia-tab-button {
        min-height: var(--ia-touch-target);
        padding: 12px 16px;
    }

    /* Style buttons */
    .ia-style-btn {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
    }

    /* Color buttons */
    .ia-color-btn {
        min-width: 36px;
        min-height: 36px;
    }

    /* Close buttons */
    .ia-modal-close,
    .ia-close-bookmarks,
    .ia-bookmark-delete {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
    }

    /* Progress bar (make it tappable) */
    .ia-progress-bar,
    .ia-progress-track {
        min-height: var(--ia-touch-target);
        cursor: pointer;
    }

    /* Video controls */
    video::-webkit-media-controls-play-button,
    video::-webkit-media-controls-fullscreen-button,
    video::-webkit-media-controls-mute-button {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
    }
}

/* Adequate spacing between touch targets */
@media (max-width: 768px) {
    .ia-language-controls .ia-control-group {
        margin-right: 8px;
    }

    .ia-lesson-navigation .ia-nav-btn {
        margin: 8px 0;
    }

    .ia-dropdown-item+.ia-dropdown-item {
        margin-top: 2px;
    }

    .ia-sidebar-section .ia-lesson-item+.ia-lesson-item {
        border-top: 1px solid var(--ia-border, #e0e0e0);
    }
}

/* Focus indicators for touch targets */
@media (max-width: 768px) {

    button:focus,
    .ia-btn:focus,
    .ia-control-btn:focus,
    .ia-nav-btn:focus,
    .ia-lesson-item:focus,
    .ia-dropdown-item:focus {
        outline: 2px solid var(--ia-secondary, #D4AF37);
        outline-offset: 2px;
    }

    /* High contrast focus indicators */
    @media (prefers-contrast: high) {

        button:focus,
        .ia-btn:focus,
        .ia-control-btn:focus {
            outline: 3px solid var(--ia-secondary, #D4AF37);
            outline-offset: 3px;
        }
    }
}

/* Touch feedback */
@media (max-width: 768px) {

    button:active,
    .ia-btn:active,
    .ia-control-btn:active,
    .ia-nav-btn:active,
    .ia-lesson-item:active,
    .ia-dropdown-item:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }

    /* Disable transform for reduced motion */
    @media (prefers-reduced-motion: reduce) {

        button:active,
        .ia-btn:active,
        .ia-control-btn:active {
            transform: none;
        }
    }
}

/* =====================================================
   Touch Target Optimization
   ===================================================== */

/* Ensure all interactive elements meet 44x44px minimum */
@media (max-width: 768px) {

    /* Buttons and interactive elements */
    button,
    .ia-btn,
    .ia-control-btn,
    .ia-nav-btn,
    .ia-mobile-sidebar-toggle,
    .ia-sidebar-close,
    .ia-reset-course-btn,
    input[type="button"],
    input[type="submit"],
    input[type="reset"] {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
        padding: 8px 12px;
    }

    /* Links that act as buttons */
    .ia-lesson-item,
    .ia-dropdown-item,
    .ia-bookmark-item,
    .ia-export-option {
        min-height: var(--ia-touch-target);
        padding: 12px var(--ia-mobile-padding);
    }

    /* Form inputs */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="search"],
    textarea,
    select {
        min-height: var(--ia-touch-target);
        padding: 12px 16px;
    }

    /* Checkbox and radio inputs */
    input[type="checkbox"],
    input[type="radio"] {
        min-width: 20px;
        min-height: 20px;
        margin: 12px;
    }

    /* Speed control and dropdown toggles */
    .ia-speed-toggle,
    .ia-subtitle-toggle,
    .ia-audio-toggle {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
    }

    /* Subtitle style buttons */
    .ia-style-btn,
    .ia-color-btn {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
    }

    /* Navigation arrows and close buttons */
    .ia-modal-close,
    .ia-close-bookmarks,
    .ia-bookmark-delete {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Video player controls */
    .ia-custom-pip-btn,
    .ia-theater-toggle,
    .ia-pip-toggle {
        min-width: var(--ia-touch-target);
        min-height: var(--ia-touch-target);
    }

    /* FAB buttons */
    .ia-mobile-fab {
        width: 56px;
        height: 56px;
        min-width: 56px;
        min-height: 56px;
    }
}

/* Touch target spacing - ensure adequate space between targets */
@media (max-width: 768px) {
    .ia-language-controls {
        gap: var(--ia-mobile-gap);
    }

    .ia-lesson-navigation {
        gap: var(--ia-mobile-gap);
    }

    .ia-control-dropdown .ia-dropdown-item+.ia-dropdown-item {
        margin-top: 4px;
    }

    .ia-sidebar-section .ia-lesson-item+.ia-lesson-item {
        border-top: 1px solid var(--ia-border, #e0e0e0);
    }
}

/* Enhanced touch feedback */
@media (max-width: 768px) {

    /* Add touch feedback for all interactive elements */
    button:active,
    .ia-btn:active,
    .ia-control-btn:active,
    .ia-nav-btn:active,
    .ia-lesson-item:active,
    .ia-dropdown-item:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }

    /* Prevent text selection during touch */
    button,
    .ia-btn,
    .ia-control-btn,
    .ia-nav-btn,
    .ia-lesson-item {
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }
}

/* Focus indicators for touch navigation */
@media (max-width: 768px) {

    button:focus,
    .ia-btn:focus,
    .ia-control-btn:focus,
    .ia-nav-btn:focus,
    .ia-lesson-item:focus,
    input:focus,
    textarea:focus,
    select:focus {
        outline: 2px solid var(--ia-secondary, #D4AF37);
        outline-offset: 2px;
    }

    /* Remove default focus styles that might interfere */
    button:focus,
    input:focus,
    textarea:focus,
    select:focus {
        box-shadow: 0 0 0 2px var(--ia-secondary, #D4AF37);
    }
}

/* =====================================================
   Enhanced Touch Interaction Feedback
   ===================================================== */

/* Ripple effect for touch interactions */
@media (max-width: 768px) {

    .ia-btn,
    .ia-control-btn,
    .ia-nav-btn,
    .ia-mobile-sidebar-toggle,
    .ia-lesson-item {
        position: relative;
        overflow: hidden;
    }

    /* Ripple animation */
    .ia-btn::after,
    .ia-control-btn::after,
    .ia-nav-btn::after,
    .ia-mobile-sidebar-toggle::after,
    .ia-lesson-item::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 0;
        height: 0;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.3);
        transform: translate(-50%, -50%);
        transition: width 0.3s ease, height 0.3s ease;
        pointer-events: none;
    }

    .ia-btn:active::after,
    .ia-control-btn:active::after,
    .ia-nav-btn:active::after,
    .ia-mobile-sidebar-toggle:active::after,
    .ia-lesson-item:active::after {
        width: 200px;
        height: 200px;
    }

    /* Enhanced hover states for touch devices */
    .ia-btn:hover,
    .ia-control-btn:hover,
    .ia-nav-btn:hover {
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        transform: translateY(-1px);
    }

    /* Active state feedback */
    .ia-btn:active,
    .ia-control-btn:active,
    .ia-nav-btn:active {
        transform: translateY(0) scale(0.98);
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    }

    /* Loading state for buttons */
    .ia-btn.loading,
    .ia-control-btn.loading {
        position: relative;
        color: transparent;
    }

    .ia-btn.loading::before,
    .ia-control-btn.loading::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 20px;
        height: 20px;
        margin: -10px 0 0 -10px;
        border: 2px solid transparent;
        border-top: 2px solid currentColor;
        border-radius: 50%;
        animation: spin 1s linear infinite;
    }

    @keyframes spin {
        0% {
            transform: rotate(0deg);
        }

        100% {
            transform: rotate(360deg);
        }
    }

    /* Success feedback animation */
    .ia-btn.success {
        background: var(--ia-success, #10b981);
        color: white;
        animation: successPulse 0.6s ease;
    }

    @keyframes successPulse {
        0% {
            transform: scale(1);
        }

        50% {
            transform: scale(1.05);
        }

        100% {
            transform: scale(1);
        }
    }

    /* Error feedback animation */
    .ia-btn.error {
        background: var(--ia-error, #ef4444);
        color: white;
        animation: errorShake 0.6s ease;
    }

    @keyframes errorShake {

        0%,
        100% {
            transform: translateX(0);
        }

        25% {
            transform: translateX(-5px);
        }

        75% {
            transform: translateX(5px);
        }
    }

    /* Progress indication for long-running actions */
    .ia-btn.progress {
        background: linear-gradient(90deg,
                var(--ia-primary, #002147) 0%,
                var(--ia-secondary, #D4AF37) 50%,
                var(--ia-primary, #002147) 100%);
        background-size: 200% 100%;
        animation: progressSlide 2s linear infinite;
    }

    @keyframes progressSlide {
        0% {
            background-position: 200% 0;
        }

        100% {
            background-position: -200% 0;
        }
    }
}

/* Enhanced focus indicators */
@media (max-width: 768px) {

    /* Focus ring animation */
    button:focus,
    .ia-btn:focus,
    .ia-control-btn:focus,
    .ia-nav-btn:focus,
    input:focus,
    textarea:focus,
    select:focus {
        outline: 2px solid var(--ia-secondary, #D4AF37);
        outline-offset: 2px;
        animation: focusPulse 2s ease-in-out infinite;
    }

    @keyframes focusPulse {

        0%,
        100% {
            outline-color: var(--ia-secondary, #D4AF37);
        }

        50% {
            outline-color: rgba(212, 175, 55, 0.5);
        }
    }

    /* Skip to content link for accessibility */
    .skip-to-content {
        position: absolute;
        top: -40px;
        left: 6px;
        background: var(--ia-primary, #002147);
        color: white;
        padding: 8px;
        text-decoration: none;
        border-radius: 4px;
        z-index: 1000;
        transition: top 0.3s ease;
    }

    .skip-to-content:focus {
        top: 6px;
    }
}

/* Haptic feedback simulation through visual cues */
@media (max-width: 768px) {

    /* Subtle bounce for successful actions */
    .ia-lesson-item.completed {
        animation: completedBounce 0.5s ease;
    }

    @keyframes completedBounce {

        0%,
        100% {
            transform: scale(1);
        }

        50% {
            transform: scale(1.02);
        }
    }

    /* Slide feedback for navigation */
    .ia-nav-btn:active {
        animation: slidePress 0.2s ease;
    }

    @keyframes slidePress {
        0% {
            transform: translateX(0);
        }

        50% {
            transform: translateX(2px);
        }

        100% {
            transform: translateX(0);
        }
    }

    /* Glow effect for important actions */
    .ia-btn-primary:hover,
    .ia-nav-btn.ia-finish:hover {
        box-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
    }
}

/* Dark theme touch feedback adjustments */
[data-theme="dark"] .ia-btn::after,
[data-theme="dark"] .ia-control-btn::after,
[data-theme="dark"] .ia-nav-btn::after {
    background: rgba(212, 175, 55, 0.2);
}

[data-theme="dark"] button:focus,
[data-theme="dark"] .ia-btn:focus,
[data-theme="dark"] .ia-control-btn:focus {
    outline-color: var(--ia-primary, #002147);
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {

    .ia-btn::after,
    .ia-control-btn::after,
    .ia-nav-btn::after,
    .ia-mobile-sidebar-toggle::after,
    .ia-lesson-item::after {
        display: none;
    }

    .ia-btn,
    .ia-control-btn,
    .ia-nav-btn {
        transition: none;
    }

    .ia-btn:active,
    .ia-control-btn:active,
    .ia-nav-btn:active {
        transform: none;
    }
}

/* =====================================================
   CSS Performance Optimizations
   ===================================================== */

/* Optimize rendering with CSS containment */
.ia-player-layout {
    contain: layout style paint;
}

.ia-video-container {
    contain: layout style paint;
}

.ia-player-sidebar {
    contain: layout style paint;
}

.ia-language-controls {
    contain: layout style;
}

/* Use transform3d to enable hardware acceleration */
.ia-player-sidebar,
.ia-sidebar-backdrop,
.ia-mobile-sidebar-toggle,
.ia-mobile-fab {
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

/* Optimize animations for 60fps */
.ia-player-sidebar {
    will-change: transform;
}

.ia-player-sidebar.open {
    will-change: auto;
}

.ia-sidebar-backdrop {
    will-change: opacity;
}

.ia-sidebar-backdrop.active {
    will-change: auto;
}

/* Efficient CSS selectors - see .ia-control-btn rules defined earlier */

/* Minimize repaints with efficient properties */
.ia-nav-btn:hover {
    transform: translateY(-2px);
    /* Use transform instead of changing position */
}

.ia-mobile-fab:hover {
    transform: translateY(-2px) scale(1.05);
    /* Combine transforms for efficiency */
}

/* Optimize font loading and rendering */
.ia-player-layout {
    font-display: swap;
    text-rendering: optimizeSpeed;
}

/* Critical CSS - inline the most important styles */
.ia-player-header {
    /* Critical above-the-fold styles */
    display: flex;
    align-items: center;
    background: var(--ia-primary, #002147);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: var(--ia-z-header);
}

/* Defer non-critical animations */
@media (prefers-reduced-motion: no-preference) {

    .ia-btn,
    .ia-control-btn,
    .ia-nav-btn {
        transition: all var(--ia-transition-normal);
    }

    .ia-player-sidebar {
        transition: right var(--ia-transition-slow);
    }

    .ia-sidebar-backdrop {
        transition: all var(--ia-transition-normal);
    }
}

/* Optimize for different connection speeds */
@media (prefers-reduced-data: reduce) {

    /* Disable non-essential animations on slow connections */
    .ia-btn::after,
    .ia-control-btn::after,
    .ia-nav-btn::after {
        display: none;
    }

    /* Reduce shadow complexity */
    .ia-mobile-fab,
    .ia-mobile-sidebar-toggle {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }
}

/* Memory-efficient CSS Grid */
.ia-player-content {
    display: grid;
    grid-template-columns: 1fr;
    /* Simplified grid for mobile */
}

@media (min-width: 1025px) {
    .ia-player-content {
        grid-template-columns: 1fr var(--ia-sidebar-max-width);
        /* Complex grid only on desktop */
    }
}

/* Efficient media queries - mobile first */
/* Base styles are mobile (0-768px) */

@media (min-width: 769px) {
    /* Tablet styles (769px-1024px) */
}

@media (min-width: 1025px) {
    /* Desktop styles (1025px+) */
}

/* Consolidate similar selectors */
.ia-btn,
.ia-control-btn,
.ia-nav-btn,
.ia-mobile-sidebar-toggle {
    /* Shared button properties */
    cursor: pointer;
    border: none;
    border-radius: var(--ia-radius-mobile);
    transition: all var(--ia-transition-normal);
    user-select: none;
}

/* Remove unused vendor prefixes for modern browsers */
.ia-language-controls {
    overflow-x: auto;
    /* Remove -webkit-overflow-scrolling: touch; for modern browsers */
}

/* Optimize z-index usage */
.ia-z-index-1 {
    z-index: 1;
}

.ia-z-index-10 {
    z-index: 10;
}

.ia-z-index-100 {
    z-index: 100;
}

.ia-z-index-200 {
    z-index: 200;
}

.ia-z-index-300 {
    z-index: 300;
}

/* Use logical properties for better internationalization */
.ia-sidebar-header {
    padding-inline: var(--ia-mobile-padding);
    padding-block: 12px;
    border-block-end: 1px solid var(--ia-border, #e0e0e0);
}

.ia-lesson-item {
    padding-inline: var(--ia-mobile-padding);
    padding-block: 12px;
    border-block-end: 1px solid var(--ia-border, #e0e0e0);
}

/* =====================================================
   Mobile Content Layout Optimization
   ===================================================== */

/* Lesson content mobile typography */
@media (max-width: 768px) {
    .ia-lesson-content {
        padding: var(--ia-mobile-padding);
        line-height: 1.6;
        font-size: var(--ia-font-size-mobile);
    }

    .ia-lesson-content h1,
    .ia-lesson-content h2,
    .ia-lesson-content h3,
    .ia-lesson-content h4 {
        line-height: 1.3;
        margin-top: 1.5em;
        margin-bottom: 0.5em;
    }

    .ia-lesson-content h1 {
        font-size: 1.5rem;
    }

    .ia-lesson-content h2 {
        font-size: 1.3rem;
    }

    .ia-lesson-content h3 {
        font-size: 1.1rem;
    }

    .ia-lesson-content h4 {
        font-size: 1rem;
    }

    .ia-lesson-content p {
        margin-bottom: 1em;
        text-align: left;
    }

    .ia-lesson-content ul,
    .ia-lesson-content ol {
        padding-left: 1.2em;
        margin-bottom: 1em;
    }

    .ia-lesson-content li {
        margin-bottom: 0.5em;
    }

    .ia-lesson-content blockquote {
        margin: 1em 0;
        padding: 1em var(--ia-mobile-padding);
        border-left: 4px solid var(--ia-secondary, #D4AF37);
        background: var(--ia-card-bg, #f8f9fa);
        border-radius: var(--ia-radius-mobile);
    }

    .ia-lesson-content code {
        background: var(--ia-card-bg, #f8f9fa);
        padding: 2px 6px;
        border-radius: 4px;
        font-size: 0.9em;
        word-break: break-all;
    }

    .ia-lesson-content pre {
        background: var(--ia-card-bg, #f8f9fa);
        padding: var(--ia-mobile-padding);
        border-radius: var(--ia-radius-mobile);
        overflow-x: auto;
        margin: 1em 0;
    }

    .ia-lesson-content pre code {
        background: none;
        padding: 0;
    }
}

/* Lesson info section mobile optimization */
@media (max-width: 768px) {
    .ia-lesson-info {
        padding: var(--ia-mobile-padding);
        background: var(--ia-bg, #ffffff);
    }

    .ia-lesson-header {
        display: flex;
        flex-direction: column;
        gap: var(--ia-mobile-gap);
        margin-bottom: 1.5em;
    }

    .ia-lesson-title {
        font-size: 1.25rem;
        font-weight: 600;
        line-height: 1.3;
        color: var(--ia-primary, #002147);
        margin: 0;
    }

    .ia-lesson-meta {
        display: flex;
        flex-wrap: wrap;
        gap: var(--ia-mobile-gap);
        font-size: 0.85rem;
        color: var(--ia-text-muted, #666);
    }

    .ia-lesson-duration,
    .ia-lesson-progress,
    .ia-lesson-type {
        display: flex;
        align-items: center;
        gap: 4px;
    }

    .ia-lesson-description {
        font-size: var(--ia-font-size-mobile);
        line-height: 1.5;
        color: var(--ia-text, #333);
        margin: 1em 0;
    }
}

/* Lesson navigation mobile optimization */
@media (max-width: 768px) {
    .ia-lesson-navigation {
        display: flex;
        flex-direction: column;
        gap: var(--ia-mobile-gap);
        padding: var(--ia-mobile-padding);
        background: var(--ia-card-bg, #f8f9fa);
        border-radius: var(--ia-radius-mobile);
        margin-top: 1.5em;
    }

    .ia-nav-btn {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 12px var(--ia-mobile-padding);
        background: var(--ia-bg, #ffffff);
        border: 2px solid var(--ia-border, #e0e0e0);
        border-radius: var(--ia-radius-mobile);
        text-decoration: none;
        color: var(--ia-text, #333);
        transition: all var(--ia-transition-normal);
        font-weight: 500;
        min-height: var(--ia-touch-target);
    }

    .ia-nav-btn:hover {
        background: var(--ia-primary, #002147);
        color: #ffffff;
        border-color: var(--ia-primary, #002147);
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0, 33, 71, 0.15);
    }

    .ia-nav-btn span {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        flex: 1;
    }

    .ia-nav-btn small {
        font-size: 0.75rem;
        opacity: 0.7;
        font-weight: 400;
        margin-bottom: 2px;
    }

    .ia-nav-btn.ia-next {
        text-align: right;
    }

    .ia-nav-btn.ia-next span {
        align-items: flex-end;
    }

    .ia-nav-btn.ia-finish {
        background: linear-gradient(135deg, var(--ia-secondary, #D4AF37), #e8c84a);
        color: var(--ia-primary, #002147);
        border-color: var(--ia-secondary, #D4AF37);
        font-weight: 600;
    }

    .ia-nav-btn.ia-finish:hover {
        background: linear-gradient(135deg, #e8c84a, var(--ia-secondary, #D4AF37));
        color: var(--ia-primary, #002147);
        border-color: #e8c84a;
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
    }

    .ia-nav-btn svg {
        flex-shrink: 0;
        width: 20px;
        height: 20px;
    }
}

/* Tablet responsive adjustments */
@media (min-width: 769px) and (max-width: 1024px) {
    .ia-lesson-navigation {
        flex-direction: row;
        justify-content: space-between;
    }

    .ia-nav-btn {
        flex: 1;
        max-width: 48%;
    }

    .ia-lesson-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }
}

/* Desktop responsive adjustments */
@media (min-width: 1025px) {
    .ia-lesson-content {
        padding: 2rem;
        font-size: var(--ia-font-size-desktop);
    }

    .ia-lesson-info {
        padding: 2rem;
    }

    .ia-lesson-navigation {
        flex-direction: row;
        justify-content: space-between;
        padding: 1.5rem 2rem;
    }

    .ia-nav-btn {
        flex: 1;
        max-width: 48%;
        padding: 1rem 1.5rem;
    }

    .ia-lesson-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }

    .ia-lesson-title {
        font-size: 1.5rem;
    }
}

/* =====================================================
   Mobile Resources and Discussion Optimization
   ===================================================== */

/* Downloadable resources mobile optimization */
@media (max-width: 768px) {
    .ia-resources-section {
        padding: var(--ia-mobile-padding);
        background: var(--ia-card-bg, #f8f9fa);
        border-radius: var(--ia-radius-mobile);
        margin: 1.5em 0;
    }

    .ia-resources-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 1em;
    }

    .ia-resources-title {
        font-size: 1.1rem;
        font-weight: 600;
        color: var(--ia-primary, #002147);
        margin: 0;
    }

    .ia-resources-count {
        font-size: 0.85rem;
        color: var(--ia-text-muted, #666);
        background: var(--ia-bg, #ffffff);
        padding: 4px 8px;
        border-radius: 12px;
    }

    .ia-resources-list {
        display: flex;
        flex-direction: column;
        gap: var(--ia-mobile-gap);
    }

    .ia-resource-item {
        display: flex;
        align-items: center;
        padding: 12px var(--ia-mobile-padding);
        background: var(--ia-bg, #ffffff);
        border-radius: var(--ia-radius-mobile);
        text-decoration: none;
        color: var(--ia-text, #333);
        transition: all var(--ia-transition-normal);
        min-height: var(--ia-touch-target);
        border: 1px solid var(--ia-border, #e0e0e0);
    }

    .ia-resource-item:hover {
        background: var(--ia-primary, #002147);
        color: #ffffff;
        border-color: var(--ia-primary, #002147);
        transform: translateY(-1px);
        box-shadow: 0 2px 8px rgba(0, 33, 71, 0.1);
    }

    .ia-resource-icon {
        flex-shrink: 0;
        width: 32px;
        height: 32px;
        background: var(--ia-secondary, #D4AF37);
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-right: 12px;
    }

    .ia-resource-icon svg {
        width: 16px;
        height: 16px;
        color: var(--ia-primary, #002147);
    }

    .ia-resource-info {
        flex: 1;
        min-width: 0;
    }

    .ia-resource-name {
        font-weight: 500;
        font-size: 0.9rem;
        margin-bottom: 2px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .ia-resource-meta {
        font-size: 0.8rem;
        color: var(--ia-text-muted, #666);
        display: flex;
        gap: 8px;
    }

    .ia-resource-size,
    .ia-resource-type {
        background: var(--ia-card-bg, #f8f9fa);
        padding: 2px 6px;
        border-radius: 4px;
        font-size: 0.75rem;
    }

    .ia-resource-download {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        color: var(--ia-text-muted, #666);
    }

    .ia-resource-item:hover .ia-resource-download {
        color: #ffffff;
    }
}

/* Discussion section mobile optimization */
@media (max-width: 768px) {
    .ia-discussion-section {
        padding: var(--ia-mobile-padding);
        background: var(--ia-bg, #ffffff);
        border-radius: var(--ia-radius-mobile);
        margin: 1.5em 0;
        border: 1px solid var(--ia-border, #e0e0e0);
    }

    .ia-discussion-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 1em;
        padding-bottom: 1em;
        border-bottom: 1px solid var(--ia-border, #e0e0e0);
    }

    .ia-discussion-title {
        font-size: 1.1rem;
        font-weight: 600;
        color: var(--ia-primary, #002147);
        margin: 0;
    }

    .ia-discussion-count {
        font-size: 0.85rem;
        color: var(--ia-text-muted, #666);
        background: var(--ia-card-bg, #f8f9fa);
        padding: 4px 8px;
        border-radius: 12px;
    }

    .ia-discussion-form {
        margin-bottom: 1.5em;
    }

    .ia-discussion-textarea {
        width: 100%;
        min-height: 80px;
        padding: 12px;
        border: 1px solid var(--ia-border, #e0e0e0);
        border-radius: var(--ia-radius-mobile);
        font-size: var(--ia-font-size-mobile);
        line-height: 1.5;
        resize: vertical;
        font-family: inherit;
    }

    .ia-discussion-textarea:focus {
        outline: none;
        border-color: var(--ia-primary, #002147);
        box-shadow: 0 0 0 2px rgba(0, 33, 71, 0.1);
    }

    .ia-discussion-submit {
        margin-top: var(--ia-mobile-gap);
        width: 100%;
        padding: 12px;
        background: var(--ia-primary, #002147);
        color: #ffffff;
        border: none;
        border-radius: var(--ia-radius-mobile);
        font-size: var(--ia-font-size-mobile);
        font-weight: 500;
        cursor: pointer;
        transition: all var(--ia-transition-normal);
        min-height: var(--ia-touch-target);
    }

    .ia-discussion-submit:hover {
        background: var(--ia-secondary, #D4AF37);
        color: var(--ia-primary, #002147);
        transform: translateY(-1px);
        box-shadow: 0 2px 8px rgba(212, 175, 55, 0.2);
    }

    html[data-theme="dark"] #ia-submit-discussion {
        background: var(--ia-secondary, #D4AF37) !important;
        color: #0a1628 !important;
        /* Dark navy text for contrast against gold */
        border-color: var(--ia-secondary, #D4AF37) !important;
    }

    html[data-theme="dark"] #ia-submit-discussion:hover {
        background: #F0C040 !important;
        /* Lighter gold on hover */
        box-shadow: 0 2px 8px rgba(240, 192, 64, 0.3) !important;
    }

    .ia-discussion-comments {
        display: flex;
        flex-direction: column;
        gap: var(--ia-mobile-gap);
    }

    .ia-discussion-comment {
        padding: var(--ia-mobile-padding);
        background: var(--ia-card-bg, #f8f9fa);
        border-radius: var(--ia-radius-mobile);
        border-left: 3px solid var(--ia-secondary, #D4AF37);
    }

    .ia-comment-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 8px;
    }

    .ia-comment-author {
        font-weight: 600;
        font-size: 0.9rem;
        color: var(--ia-primary, #002147);
    }

    .ia-comment-date {
        font-size: 0.8rem;
        color: var(--ia-text-muted, #666);
    }

    html[data-theme="dark"] .ia-comment-author {
        color: rgba(255, 255, 255, 0.9) !important;
    }

    html[data-theme="dark"] .ia-comment-date {
        color: rgba(255, 255, 255, 0.6) !important;
    }

    .ia-comment-content {
        font-size: var(--ia-font-size-mobile);
        line-height: 1.5;
        color: var(--ia-text, #333);
    }

    .ia-comment-actions {
        margin-top: 8px;
        display: flex;
        gap: var(--ia-mobile-gap);
    }

    .ia-comment-reply,
    .ia-comment-like {
        background: none;
        border: none;
        color: var(--ia-text-muted, #666);
        font-size: 0.8rem;
        cursor: pointer;
        padding: 4px 8px;
        border-radius: 4px;
        transition: all var(--ia-transition-normal);
        display: flex;
        align-items: center;
        gap: 4px;
    }

    .ia-comment-reply:hover,
    .ia-comment-like:hover {
        background: var(--ia-border, #e0e0e0);
        color: var(--ia-text, #333);
    }

    .ia-comment-like.liked {
        color: var(--ia-secondary, #D4AF37);
    }
}

/* Empty states for resources and discussions */
@media (max-width: 768px) {

    .ia-resources-empty,
    .ia-discussion-empty {
        text-align: center;
        padding: 2em var(--ia-mobile-padding);
        color: var(--ia-text-muted, #666);
    }

    .ia-resources-empty svg,
    .ia-discussion-empty svg {
        width: 48px;
        height: 48px;
        margin-bottom: 1em;
        opacity: 0.5;
    }

    .ia-resources-empty h4,
    .ia-discussion-empty h4 {
        font-size: 1rem;
        margin-bottom: 0.5em;
        color: var(--ia-text, #333);
    }

    .ia-resources-empty p,
    .ia-discussion-empty p {
        font-size: 0.9rem;
        margin: 0;
    }
}

/* Dark theme adjustments */
[data-theme="dark"] .ia-resource-item:hover .ia-resource-icon {
    background: var(--ia-primary, #002147);
}

[data-theme="dark"] .ia-resource-item:hover .ia-resource-icon svg {
    color: var(--ia-secondary, #D4AF37);
}

[data-theme="dark"] .ia-discussion-textarea {
    background: var(--ia-card-bg, #1a1a1a);
    color: var(--ia-text, #ffffff);
}

[data-theme="dark"] .ia-comment-like.liked {
    color: var(--ia-secondary, #D4AF37);
}