/* Enhanced BiomedicalMD Website Styles */

:root {
    /* Modern Academic Color Palette */
    --primary-color: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --secondary-color: #3b82f6;
    --accent-color: #6366f1;
    --success-color: #10b981;
    --danger-color: #ef4444;

    /* Surface & Background */
    --light-gray: #f1f5f9;
    --background-color: #f8fafc;
    --surface-color: #ffffff;

    /* Text Colors */
    --dark-text: #0f172a;
    --medium-text: #334155;
    --light-text: #64748b;

    /* Borders & Shadows */
    --border-color: #e2e8f0;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.15);
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 20px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--dark-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Overriding Bootstrap Default Colors with Brand Colors */
.bg-primary {
    background-color: var(--primary-color) !important;
}

.text-primary {
    color: var(--primary-color) !important;
}

/* Modern Button Styles */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    transition: all var(--transition-normal);
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.35);
}

.btn-outline-secondary {
    border: 1px solid var(--border-color);
    color: var(--medium-text);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.btn-outline-secondary:hover {
    background-color: var(--light-gray);
    border-color: var(--border-color);
    color: var(--dark-text);
}

/* ============================================
   ENHANCED NAVIGATION BAR
   ============================================ */

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.navbar {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.95) 0%, rgba(30, 58, 138, 0.95) 100%) !important;
    padding: 1rem 2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 0.75rem 2rem;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.98) 0%, rgba(30, 58, 138, 0.98) 100%) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.navbar-brand img.logo {
    height: 40px;
    margin-right: 12px;
    transition: transform var(--transition-normal);
}

.navbar-brand:hover img.logo {
    transform: scale(1.05);
}

.navbar-brand {
    font-weight: 600;
    letter-spacing: -0.25px;
    font-size: 1.1rem;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    padding: 0.5rem 1rem;
    margin-left: 8px;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-normal);
    position: relative;
}

.navbar-dark .navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.navbar-dark .navbar-nav .nav-link:hover::after,
.navbar-dark .navbar-nav .nav-link.active::after {
    width: 70%;
}

.navbar-dark .navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    transform: translateY(-1px);
}

/* User Avatar Enhancement */
.user-avatar {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.user-avatar i {
    font-size: 1.1rem;
    color: white;
}

.nav-link:hover .user-avatar {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Dropdown Menu Styling */
.dropdown-menu {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    padding: 0.5rem;
    margin-top: 0.5rem;
}

.dropdown-item {
    border-radius: var(--border-radius-sm);
    padding: 0.625rem 1rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--light-gray);
    transform: translateX(4px);
}

.dropdown-divider {
    margin: 0.5rem;
    opacity: 0.3;
}

/* ============================================
   COURSE CARD REDESIGN
   ============================================ */

.course-card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: all var(--transition-slow);
    background-color: var(--surface-color);
    overflow: hidden;
    position: relative;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent-color));
    transform: scaleX(0);
    transition: transform var(--transition-slow);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.course-card:hover::before {
    transform: scaleX(1);
}

.course-card .card-img-top {
    height: 220px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.course-card:hover .card-img-top {
    transform: scale(1.05);
}

.course-card .card-body {
    padding: 1.5rem;
    position: relative;
}

.course-card .card-title {
    font-weight: 700;
    font-size: 1.1rem;
    line-height: 1.4;
    margin-bottom: 0.75rem;
    color: var(--dark-text);
}

.course-card .card-text {
    color: var(--medium-text);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* Course Metadata Styling */
.course-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--light-text);
    margin-bottom: 1rem;
}

.course-meta .instructor-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: linear-gradient(135deg, var(--light-gray) 0%, #e2e8f0 100%);
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.8rem;
}

.course-meta .instructor-badge i {
    color: var(--primary-color);
}

/* Card Footer & Action Button */
.course-card .card-footer {
    background: transparent;
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

.course-card .btn-view-course {
    width: 100%;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border: none;
    color: white;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
    text-decoration: none;
    cursor: pointer;
}

.course-card .btn-view-course:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.4);
    color: white;
}

.course-card .btn-view-course i {
    transition: transform var(--transition-normal);
}

.course-card .btn-view-course:hover i {
    transform: translateX(4px);
}

/* Course Card Badge */
.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(135deg, var(--accent-color) 0%, #4f46e5 100%);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
    z-index: 2;
}

/* Card Image Overlay for Title on Hover */
.card-image-wrapper {
    position: relative;
    overflow: hidden;
}

.card-image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(30, 64, 175, 0.9), transparent);
    padding: 2rem 1.5rem 1rem;
    transform: translateY(100%);
    transition: transform var(--transition-slow);
}

.course-card:hover .card-image-overlay {
    transform: translateY(0);
}

.card-image-overlay h6 {
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
    margin: 0;
}

/* ============================================
   HERO SECTION STYLES
   ============================================ */

.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, #1e1b4b 100%);
    padding: 4rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    max-width: 600px;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: white;
    color: var(--primary-color);
    font-weight: 600;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    color: var(--primary-dark);
}

/* ============================================
   FOOTER STYLES
   ============================================ */

.main-footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.main-footer h5 {
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.main-footer ul {
    list-style: none;
    padding: 0;
}

.main-footer ul li {
    margin-bottom: 0.5rem;
}

.main-footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.main-footer a:hover {
    color: white;
    transform: translateX(4px);
    display: inline-block;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ============================================
   VIEWER PAGE UI OPTIMIZATIONS
   ============================================ */

/* Viewer Container */
.viewer-container {
    position: relative;
}

/* Content Header - Compact and Responsive */
.content-header {
    padding: 0.875rem 1rem;
    min-height: 64px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .content-header {
        padding: 0.875rem 1.5rem;
    }
}

/* Module Breadcrumb */
.module-breadcrumb {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.75px;
    color: var(--light-text);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

/* Lesson Title in Header */
.lesson-title-header {
    font-size: 1.1rem;
    line-height: 1.3;
    max-width: 500px;
    color: var(--dark-text);
    font-weight: 600;
    letter-spacing: -0.25px;
}

@media (min-width: 992px) {
    .lesson-title-header {
        font-size: 1.25rem;
        max-width: 600px;
    }
}

/* Navigation Buttons - Desktop */
.nav-buttons-desktop .btn {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--border-radius-sm);
}

.nav-buttons-desktop .btn-primary {
    padding: 0.5rem 1.5rem;
}

.nav-buttons-desktop .btn i {
    font-size: 0.75rem;
}

/* Mobile Header */
.mobile-header {
    min-height: 56px;
    padding: 0.5rem 0.75rem;
    background: var(--surface-color);
}

.lesson-title-mobile {
    font-size: 0.9rem;
    line-height: 1.3;
    font-weight: 600;
    color: var(--dark-text);
}

/* ============================================
   SIDEBAR IMPROVEMENTS
   ============================================ */

.sidebar {
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
}

/* Sidebar Header */
.sidebar-header {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--surface-color) 0%, var(--light-gray) 100%);
}

.sidebar-header h6 {
    font-weight: 600;
    color: var(--dark-text);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    letter-spacing: -0.25px;
}

/* Module Progress Bar */
.module-progress {
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.module-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: 3px;
    transition: width 0.5s ease;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--light-text);
    margin-bottom: 0.5rem;
}

.accordion-button {
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.875rem 1rem;
    background-color: var(--surface-color);
    border: none;
    transition: all var(--transition-normal);
}

.accordion-button:not(.collapsed) {
    color: var(--primary-color);
    background-color: var(--light-gray);
    box-shadow: none;
    font-weight: 600;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: transparent;
}

.accordion-button::after {
    transition: transform var(--transition-normal);
}

.list-group-item.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Lesson Items - Better Touch Targets */
.lesson-item {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    transition: all var(--transition-normal);
    border-left: 3px solid transparent;
    color: var(--medium-text);
    border-radius: 0;
    margin: 2px 0;
    position: relative;
}

@media (min-width: 768px) {
    .lesson-item {
        padding: 0.625rem 1rem;
        margin: 2px 8px;
        border-radius: var(--border-radius-sm);
        border-left: none;
    }
}

.lesson-item:hover {
    background-color: var(--light-gray);
    color: var(--dark-text);
    text-decoration: none;
}

.lesson-item.active {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%) !important;
    color: white !important;
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.25);
}

.lesson-item.active:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%) !important;
}

.lesson-item.active .lesson-icon {
    color: white;
}

.lesson-item.active .badge {
    background-color: rgba(255, 255, 255, 0.25) !important;
}

/* Lesson Icon */
.lesson-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    background-color: var(--light-gray);
    flex-shrink: 0;
    transition: all var(--transition-normal);
}

.lesson-item:hover .lesson-icon {
    background-color: var(--border-color);
}

.lesson-item.active .lesson-icon {
    background-color: rgba(255, 255, 255, 0.2);
}

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

.lesson-item.active .lesson-icon i {
    color: white;
}

/* Completion Checkmark */
.lesson-check {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-left: 8px;
}

.lesson-check.completed {
    background-color: var(--success-color);
    color: white;
}

.lesson-check.completed i {
    font-size: 0.65rem;
}

.lesson-check:not(.completed) {
    border: 2px solid var(--border-color);
    background-color: transparent;
}

.lesson-item.active .lesson-check:not(.completed) {
    border-color: rgba(255, 255, 255, 0.5);
}

/* Lesson Title - Truncate with ellipsis */
.lesson-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    font-weight: 500;
}

/* Video Duration Badge */
.lesson-item .badge {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

/* Accordion Button - Tooltip support */
.accordion-button span[title] {
    cursor: pointer;
}

/* ============================================
   CONTENT AREA STYLING
   ============================================ */

/* Content Wrapper */
.content-wrapper {
    position: relative;
    background: linear-gradient(180deg, var(--background-color) 0%, #eef2f7 100%);
}

/* Reading Container */
.reading-container {
    max-width: 900px;
    padding: 1.5rem 1rem;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .reading-container {
        padding: 2.5rem 1.5rem;
    }
}

@media (min-width: 992px) {
    .reading-container {
        padding: 3rem 2rem;
    }
}

/* Content Card */
.content-card {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    box-shadow: var(--card-shadow);
}

.content-card .card-body {
    padding: 1.5rem;
}

@media (min-width: 768px) {
    .content-card .card-body {
        padding: 2.5rem;
    }
}

@media (min-width: 992px) {
    .content-card .card-body {
        padding: 3rem;
    }
}

/* Slides/Download Card */
.content-card.text-center {
    background: linear-gradient(180deg, var(--surface-color) 0%, var(--light-gray) 100%);
    border: 1px solid var(--border-color);
}

.content-card .display-1 {
    color: var(--primary-light) !important;
    font-size: 4rem;
}

/* Video Container */
.video-container {
    background-color: #0f0f0f;
    border-radius: 0;
}

.video-container video {
    border-radius: 0;
}

/* Iframe Wrapper */
.iframe-wrapper {
    position: relative;
    background-color: var(--light-gray);
    padding: 1rem;
}

@media (min-width: 768px) {
    .iframe-wrapper {
        padding: 1.5rem;
    }
}

.iframe-wrapper iframe {
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
}

/* Iframe Loading State */
.iframe-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
    background: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
}

.iframe-loading .spinner-border {
    width: 2.5rem;
    height: 2.5rem;
}

.content-iframe {
    display: block;
    background-color: white;
}

/* ============================================
   MOBILE BOTTOM NAVIGATION
   ============================================ */

.mobile-nav-bar {
    position: sticky;
    bottom: 0;
    z-index: 100;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    padding: 0.75rem 1rem;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

.mobile-nav-btn {
    min-width: 80px;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
}

.mobile-nav-btn.btn-primary {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border: none;
}

.mobile-nav-btn:disabled {
    opacity: 0.4;
}

.progress-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.progress-indicator small {
    font-size: 0.7rem;
    margin-bottom: 0.375rem;
    font-weight: 500;
    color: var(--light-text);
}

.progress-indicator .progress {
    width: 100%;
    max-width: 100px;
    height: 5px;
    background-color: var(--border-color);
    border-radius: 3px;
}

.progress-indicator .progress-bar {
    background: linear-gradient(90deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */

/* Hide mobile nav on desktop */
@media (min-width: 768px) {
    .mobile-nav-bar {
        display: none !important;
    }
}

/* Adjust content area for mobile nav */
@media (max-width: 767.98px) {
    .content-area {
        padding-bottom: 0;
    }

    /* Ensure content doesn't get hidden behind mobile nav */
    .content-wrapper {
        margin-bottom: 0;
    }
}

/* ============================================
   SIDEBAR MOBILE OVERLAY
   ============================================ */

.sidebar.show {
    position: fixed;
    top: 56px;
    left: 0;
    bottom: 0;
    z-index: 1040;
    width: 280px;
    max-width: 85vw;
}

@media (max-width: 767.98px) {
    .sidebar.collapsing {
        transition: none;
    }
}

/* ============================================
   FULLSCREEN MODE STYLES
   ============================================ */

/* Fullscreen Toggle Button */
.btn-fullscreen {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    border: none;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.btn-fullscreen:hover {
    background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.45);
    color: white;
}

.btn-fullscreen:active {
    transform: translateY(0);
}

.btn-fullscreen.active {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.35);
}

.btn-fullscreen.active:hover {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.45);
}

.btn-fullscreen i {
    font-size: 0.875rem;
}

.fullscreen-label {
    display: none;
}

@media (min-width: 992px) {
    .fullscreen-label {
        display: inline;
    }
}

/* Fullscreen Hidden Elements */
.fullscreen-hidden {
    display: none !important;
}

/* Fullscreen Mode Body */
body.fullscreen-mode {
    overflow: hidden;
}

/* Fullscreen Container */
.fullscreen-container {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 9999 !important;
    background-color: var(--background-color);
}

/* Fullscreen Content Area */
.fullscreen-content {
    width: 100% !important;
    max-width: 100% !important;
    flex: 1 1 100% !important;
    height: 100vh !important;
}

/* Fullscreen Header - Compact */
.fullscreen-header {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 10000 !important;
    background: var(--surface-color) !important;
    border-bottom: 1px solid var(--border-color) !important;
    min-height: 48px !important;
    padding: 0.5rem 1rem !important;
}

.fullscreen-header .lesson-title-header {
    font-size: 1rem !important;
}

.fullscreen-header .module-breadcrumb {
    font-size: 0.65rem !important;
}

.fullscreen-header .btn {
    padding: 0.375rem 0.875rem !important;
    font-size: 0.8rem !important;
}

.fullscreen-header .btn-fullscreen {
    padding: 0.375rem 0.75rem !important;
}

/* Adjust content wrapper in fullscreen */
.fullscreen-content .content-wrapper {
    height: calc(100vh - 48px) !important;
    margin-top: 48px;
}

/* Fullscreen iframe wrapper adjustments */
.fullscreen-content .iframe-wrapper {
    padding: 0 !important;
    height: 100% !important;
}

.fullscreen-content .iframe-wrapper iframe {
    border-radius: 0 !important;
    box-shadow: none !important;
}