/* CSS Variables for Themes */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --sidebar-width: 280px;
    --navbar-height: 60px;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #94a3b8;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.hidden {
    display: none !important;
}

/* Login Page Styles */
.login-container {
    min-height: 100vh;
    display: flex;
    background: #1a1a1a;
    overflow: hidden;
    position: relative;
}

.tagline-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 80px;
    z-index: 10;
    padding-top: 20px;
}

.main-tagline {
    color: #22c55e;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 3px;
    margin: 0;
    text-shadow: 0 2px 4px rgba(34, 197, 94, 0.3);
}

.login-left {
    flex: 1;
    background: #2a2a2a;
    padding: 60px 80px;
    padding-top: 100px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.login-left::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
    opacity: 0.9;
}

.login-content {
    position: relative;
    z-index: 2;
    max-width: 500px;
}

.logo-section {
    margin-bottom: 60px;
}

.login-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 24px;
    border-radius: 12px;
}

.logo-section h1 {
    color: #ffffff;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.2;
}

.tagline {
    color: #a0a0a0;
    font-size: 18px;
    font-weight: 400;
    margin: 0;
}

.feature-highlights {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: #22c55e;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-icon i {
    color: #ffffff;
    font-size: 20px;
}

.feature-text h3 {
    color: #ffffff;
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 8px 0;
}

.feature-text p {
    color: #a0a0a0;
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
}

.login-right {
    width: 480px;
    background: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    padding-top: 100px;
}

.login-form-container {
    width: 100%;
    max-width: 360px;
}

.login-header {
    margin-bottom: 32px;
    text-align: left;
}

.login-header h2 {
    color: #1f2937;
    font-size: 24px;
    font-weight: 600;
    margin: 0 0 8px 0;
}

.login-header p {
    color: #6b7280;
    font-size: 14px;
    margin: 0;
}

.login-form {
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: #374151;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 16px;
    background: #ffffff;
    color: #1f2937;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.form-group input:focus {
    outline: none;
    border-color: #22c55e;
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.form-group input::placeholder {
    color: #9ca3af;
}

/* Login Type Toggle */
.login-type-toggle {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 8px;
}

.login-type-toggle label {
    font-size: 13px;
    font-weight: 600;
    color: #374151;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toggle-buttons {
    display: flex;
    gap: 8px;
    background: #f3f4f6;
    padding: 4px;
    border-radius: 8px;
}

.toggle-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: #6b7280;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.toggle-btn:hover {
    background: #e5e7eb;
    color: #374151;
}

.toggle-btn.active {
    background: #22c55e;
    color: white;
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.2);
}

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.remember-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #374151;
}

.remember-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    accent-color: #22c55e;
}

.login-btn {
    width: 100%;
    padding: 12px 24px;
    background: #22c55e;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 16px;
}

.login-btn:hover {
    background: #16a34a;
}

.login-btn:active {
    transform: translateY(1px);
}

.login-btn:disabled {
    background: #9ca3af;
    cursor: not-allowed;
}

.error-message {
    color: #ef4444;
    font-size: 14px;
    padding: 12px 16px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    margin-bottom: 16px;
    display: none;
}

.error-message:not(:empty) {
    display: block;
}

.demo-credentials {
    padding: 20px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 16px;
}

.demo-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
    color: #6b7280;
    font-size: 14px;
    font-weight: 500;
}

.demo-info i {
    color: #3b82f6;
}

.demo-credentials p {
    margin: 4px 0;
    font-size: 13px;
    color: #4b5563;
}

.demo-credentials strong {
    color: #1f2937;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    background: #ffffff;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #e5e7eb;
}

.legal-links {
    padding: 20px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    text-align: center;
}

.legal-links-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.legal-link {
    color: #3b82f6;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}

.legal-link:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

.separator {
    color: #9ca3af;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .login-left {
        padding: 40px 60px;
    }
    
    .login-right {
        width: 420px;
    }
}

@media (max-width: 768px) {
    .login-container {
        flex-direction: column;
    }
    
    .login-left {
        flex: none;
        min-height: 35vh;
        padding: 30px 20px;
        padding-top: 80px;
    }
    
    .login-content {
        max-width: none;
    }
    
    .tagline-header {
        height: 60px;
        padding-top: 15px;
    }
    
    .main-tagline {
        font-size: 18px;
        letter-spacing: 2px;
    }
    
    .logo-section {
        margin-bottom: 20px;
        text-align: center;
    }
    
    .logo-section h1 {
        font-size: 28px;
    }
    
    .feature-highlights {
        display: none;
    }
    
    .login-right {
        width: 100%;
        min-height: 65vh;
        padding: 30px 20px;
    }
}

@media (max-width: 480px) {
    .login-left {
        padding: 20px 15px;
        padding-top: 60px;
        min-height: 30vh;
    }
    
    .tagline-header {
        height: 50px;
        padding-top: 10px;
    }
    
    .main-tagline {
        font-size: 16px;
        letter-spacing: 1px;
    }
    
    .login-right {
        padding: 20px 15px;
    }
    
    .login-form-container {
        max-width: none;
    }
    
    .legal-links-container {
        flex-direction: column;
        gap: 8px;
    }
    
    .separator {
        display: none;
    }
}

/* Top Navigation */
.top-navbar {
    height: var(--navbar-height);
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-sizing: border-box;
    width: 100%;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-shrink: 0;
}

.nav-logo-link {
    display: block;
    text-decoration: none;
    transition: all 0.3s ease;
    flex-shrink: 0;
    border-radius: 6px;
}

.nav-logo-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.nav-logo {
    width: 40px;
    height: 40px;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
    object-fit: contain;
    object-position: center;
    display: block;
}

.nav-logo-link:hover .nav-logo {
    transform: scale(1.05);
    opacity: 0.9;
}

/* Logo displays cleanly in both light and dark themes without extra styling */



.nav-categories {
    display: flex;
    gap: 5px;
}

.nav-category {
    padding: 8px 16px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.nav-category:hover,
.nav-category.active {
    background: var(--primary-color);
    color: white;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-btn {
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.profile-dropdown {
    position: relative;
}

.profile-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.profile-btn:hover {
    background: var(--border-color);
}

.profile-img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--border-color);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    max-width: 250px;
    width: auto;
    z-index: 9998;
    margin-top: 5px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    overflow: visible;
}

.dropdown-menu.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    padding: 12px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    transition: background-color 0.3s ease;
}

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

.theme-selector {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-selector .theme-arrow {
    margin-left: auto;
}



.theme-arrow {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.theme-selector.expanded .theme-arrow {
    transform: rotate(90deg);
}

.theme-submenu {
    position: absolute;
    left: 100%;
    top: 0;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    width: 180px;
    min-width: 180px;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: all 0.3s ease;
    white-space: nowrap;
    margin-left: 5px;
}

.theme-submenu.visible {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* Positioning variants for viewport constraints */
.theme-submenu.position-left {
    left: auto;
    right: 100%;
    margin-left: 0;
    margin-right: 5px;
    transform: translateX(10px);
}

.theme-submenu.position-left.visible {
    transform: translateX(0);
}

.theme-submenu.position-up {
    top: auto;
    bottom: 0;
}

.theme-submenu.position-down {
    top: 0;
}



.theme-option {
    padding: 10px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-primary);
    transition: background-color 0.3s ease;
    gap: 8px;
    white-space: nowrap;
    min-height: 36px;
    font-size: 14px;
}

.theme-option:first-child {
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}

.theme-option:last-child {
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
}

.theme-option:hover {
    background: var(--border-color);
}

.theme-option i:first-child {
    width: 16px;
    text-align: center;
}

.theme-check {
    color: var(--primary-color);
    font-size: 14px;
}

.theme-option.active .theme-check {
    display: block !important;
}

.mobile-menu-btn {
    display: none;
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
}

/* Main Content Layout */
.main-app {
    padding-top: var(--navbar-height);
}

.main-content {
    display: flex;
    height: calc(100vh - var(--navbar-height));
    width: 100%;
    position: relative;
    overflow: hidden; /* Prevent page-level scrolling */
}

/* Sidebars */
.primary-sidebar,
.secondary-sidebar {
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    transition: all 0.3s ease;
    flex-shrink: 0;
    height: 100%; /* Take full height of parent */
}

.primary-sidebar {
    width: 0;
    overflow: hidden;
    transition: width 0.3s ease;
}

.primary-sidebar.visible {
    width: var(--sidebar-width);
}

.secondary-sidebar {
    width: 0;
    overflow: hidden;
    transition: width 0.3s ease;
}

.secondary-sidebar.visible {
    width: 250px;
}

.sidebar-content {
    padding: 20px;
}

.module-item,
.topic-item {
    padding: 12px 16px;
    margin-bottom: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.module-item:hover,
.topic-item:hover {
    background: var(--border-color);
}

.module-item.active,
.topic-item.active {
    background: var(--primary-color);
    color: white;
}

.module-item i {
    transition: transform 0.3s ease;
}

.module-item.expanded i {
    transform: rotate(90deg);
}

.submodules {
    margin-left: 20px;
    margin-top: 8px;
    display: none;
}

.submodules.visible {
    display: block;
}

.submodule-item {
    padding: 8px 12px;
    margin-bottom: 4px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.submodule-item:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.submodule-item.active {
    background: var(--primary-color);
    color: white;
}

/* Content Area */
.content-area {
    flex: 1;
    padding: 0;
    overflow-y: auto;
    overflow-x: hidden;
    transition: margin-left 0.3s ease;
    min-width: 0; /* Prevent flex item from overflowing */
    background: var(--background-color);
    position: relative;
    z-index: 1;
    height: 100%; /* Take full height of parent */
}

/* Prevent layout shifts during state transitions */
.content-area {
    position: relative;
}

/* Home dashboard layout */
.welcome-screen {
    text-align: center;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 20px 60px 20px;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1;
    overflow-y: auto; /* Allow welcome screen to scroll if needed */
}

.welcome-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none; /* Prevent interaction when hidden */
    display: none; /* Completely remove from layout when hidden */
}

/* Course welcome layout */
.course-welcome {
    text-align: center;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    display: none; /* Hidden by default */
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1;
    pointer-events: none; /* Prevent interaction when hidden */
    overflow-y: auto; /* Allow course welcome to scroll if needed */
}

.course-welcome:not(.hidden) {
    display: flex; /* Show as flex when not hidden */
    opacity: 1;
    visibility: visible;
    pointer-events: auto; /* Allow interaction when visible */
}

/* Home dashboard content */
.welcome-screen .welcome-content {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

.welcome-screen .welcome-content h1 {
    font-size: 36px;
    margin-bottom: 16px;
    color: var(--text-primary);
    margin-top: 20px;
}

.welcome-screen .welcome-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* Course welcome content */
.course-welcome .welcome-content {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.course-welcome .welcome-content h1 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.course-welcome .welcome-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* Course welcome icon styling */
.course-welcome-icon-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
}

.course-welcome-icon {
    width: 80px;
    height: 80px;
    object-fit: contain;
    object-position: center;
    display: block;
    margin: 0;
    opacity: 1;
    visibility: visible;
}

.course-welcome-icon.fas {
    font-size: 80px;
    color: var(--primary-color);
    width: auto;
    height: auto;
}

/* Course icons in home dashboard only */
.welcome-screen .welcome-content .course-icon {
    /* This styling only applies to home dashboard course icons */
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 120px;
    margin: 0 auto 30px auto;
    background: none;
    border: none;
    box-shadow: none;
    transition: all 0.3s ease;
}

.welcome-screen .welcome-content .course-icon:hover {
    transform: scale(1.05);
}

.welcome-screen .welcome-content .course-icon:focus {
    outline: none;
}

.welcome-screen .welcome-content .course-icon i {
    font-size: 64px;
    color: var(--primary-color);
    display: block;
}

.welcome-screen .welcome-content .course-svg-icon {
    width: 80px;
    height: 80px;
    object-fit: contain;
    object-position: center;
    display: block;
    margin: 0;
}

/* Note: Course welcome pages now show course icons using .course-welcome-icon class */

/* Course icons grid - equally distributed */
.course-icons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    justify-items: center;
    position: relative;
    z-index: 1;
}

.course-icon {
    padding: 20px 15px;
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    display: flex !important;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    width: 180px;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
    opacity: 1;
    visibility: visible;
}

.course-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.2), transparent);
    transition: left 0.6s ease;
    z-index: 1;
}

.course-icon:hover::before {
    left: 100%;
}

.course-icon:hover {
    border-color: var(--primary-color);
    transform: translateY(-8px) scale(1.08);
    box-shadow: 0 20px 40px rgba(37, 99, 235, 0.3), 0 8px 16px rgba(0, 0, 0, 0.15);
    background: var(--background-color);
    z-index: 10;
}

.course-icon:hover::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border: 2px solid var(--primary-color);
    border-radius: 14px;
    opacity: 0.6;
    animation: pulse 2s ease-in-out infinite;
    z-index: -1;
}

.course-icon:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.course-icon:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.course-icon:active {
    transform: translateY(-2px) scale(1.02);
    transition: all 0.1s ease;
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .course-icon:hover {
        transform: none;
        box-shadow: var(--shadow);
    }
    
    .course-icon:active {
        transform: scale(0.98);
        background: var(--border-color);
    }
}

.course-icon i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 12px;
    display: block;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
    flex-shrink: 0;
}

.course-icon:hover i {
    transform: scale(1.15);
    color: var(--primary-color);
    filter: drop-shadow(0 2px 4px rgba(37, 99, 235, 0.3));
}

.course-svg-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 12px;
    display: block !important;
    margin-left: auto;
    margin-right: auto;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
    object-fit: contain;
    flex-shrink: 0;
    opacity: 1;
    visibility: visible;
}

.course-icon:hover .course-svg-icon {
    transform: scale(1.15);
    filter: brightness(1.3) drop-shadow(0 2px 8px rgba(37, 99, 235, 0.4));
}

.course-icon span {
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    word-wrap: break-word;
    hyphens: auto;
    line-height: 1.3;
    margin-top: 8px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 100%;
    white-space: normal;
    overflow-wrap: break-word;
    font-size: 14px;
}

.course-icon:hover span {
    color: var(--primary-color);
    transform: translateY(-3px);
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

/* Markdown Content */
.markdown-content {
    max-width: 100%;
    margin: 0;
    position: relative;
    padding: 20px 40px;
    display: none; /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 2; /* Higher than welcome screens */
    min-height: 100%; /* Ensure it takes at least full height */
    box-sizing: border-box;
}

.markdown-content:not(.hidden) {
    display: block; /* Show as block when not hidden */
    opacity: 1;
    visibility: visible;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.markdown-content h1 {
    font-size: 32px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.markdown-content h2 {
    font-size: 24px;
}

.markdown-content h3 {
    font-size: 20px;
}

.markdown-content p {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.markdown-content ul,
.markdown-content ol {
    margin-bottom: 16px;
    padding-left: 30px;
}

.markdown-content li {
    margin-bottom: 8px;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 20px 0;
}

.markdown-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 20px;
    margin: 20px 0;
    font-style: italic;
    color: var(--text-secondary);
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.markdown-content th,
.markdown-content td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.markdown-content th {
    background: var(--surface-color);
    font-weight: 600;
}

/* Code Blocks */
.code-block-container {
    position: relative;
    margin: 20px 0;
}

.copy-button {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 6px 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.code-block-container:hover .copy-button {
    opacity: 1;
}

.copy-button:hover {
    background: #1d4ed8;
}

.copy-button.copied {
    background: #10b981;
}

pre {
    background: var(--surface-color) !important;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.5;
}

code {
    background: var(--surface-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 14px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

pre code {
    background: transparent;
    padding: 0;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.modal-content {
    background: var(--background-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header,
.search-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
}

.close-btn {
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    border-radius: 4px;
}

.close-btn:hover {
    background: var(--border-color);
}

/* Search Modal */
#search-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background: var(--surface-color);
    color: var(--text-primary);
    margin-right: 15px;
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-results {
    padding: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.search-result {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.search-result:hover {
    background: var(--surface-color);
    border-color: var(--primary-color);
}

.search-result-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.search-result-path {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.search-result-snippet {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Settings Modal */
.settings-content {
    padding: 20px;
}

.setting-group {
    margin-bottom: 25px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.setting-group input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--surface-color);
    color: var(--text-primary);
    margin-bottom: 10px;
}

.image-upload {
    display: flex;
    align-items: center;
    gap: 15px;
}

.preview-img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--border-color);
}

.upload-btn {
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}

.upload-btn:hover {
    background: #1d4ed8;
}

.change-password-btn {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

.change-password-btn:hover {
    background: #1d4ed8;
}

/* Chatbot */
.chatbot-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1500;
}

.chatbot-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.chatbot-toggle:hover {
    background: #1d4ed8;
    transform: scale(1.05);
}

.chatbot-iframe-container {
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 350px;
    height: 500px;
    background: var(--background-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.chatbot-iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-categories {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .primary-sidebar,
    .secondary-sidebar {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        height: calc(100vh - var(--navbar-height));
        z-index: 1100;
        width: var(--sidebar-width) !important;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .primary-sidebar.visible {
        transform: translateX(0);
        width: var(--sidebar-width) !important;
    }
    
    .secondary-sidebar {
        width: 250px !important;
    }
    
    .secondary-sidebar.visible {
        transform: translateX(0);
        width: 250px !important;
    }
    
    .content-area {
        margin-left: 0;
        width: 100%;
    }
}

/* Large screens (up to 53 inches / 4K displays) */
@media (min-width: 2560px) {
    .course-icons {
        grid-template-columns: repeat(5, 1fr);
        max-width: 1600px;
        gap: 30px;
    }
    
    .course-icon {
        width: 200px;
        min-height: 140px;
    }
    
    .welcome-screen .welcome-content h1 {
        font-size: 48px;
    }
    
    .welcome-screen {
        padding: 50px 20px 80px 20px;
    }
}

@media (max-width: 1200px) and (min-width: 901px) {
    .course-icons {
        grid-template-columns: repeat(4, 1fr);
        gap: 18px;
        padding: 0 30px;
    }
    
    .course-icon {
        width: 170px;
    }
}

@media (max-width: 900px) and (min-width: 601px) {
    .course-icons {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
        padding: 0 20px;
    }
    
    .course-icon {
        width: 160px;
        min-height: 110px;
    }
}

@media (max-width: 768px) {
    .top-navbar {
        padding: 0 15px;
    }
    
    .nav-left {
        gap: 15px;
    }
    
    .content-area {
        padding: 0;
        height: calc(100vh - var(--navbar-height));
    }
    
    .welcome-screen {
        padding: 30px 15px 50px 15px;
    }
    
    .course-welcome {
        padding: 40px 15px;
        min-height: 400px;
    }
    
    .course-welcome-icon {
        width: 64px;
        height: 64px;
    }
    
    .course-welcome-icon.fas {
        font-size: 64px;
    }
    
    .welcome-screen .welcome-content h1 {
        font-size: 28px;
    }
    
    .welcome-screen .welcome-content .course-icon {
        width: 100px;
        height: 100px;
        margin-bottom: 25px;
        background: none;
        border: none;
        box-shadow: none;
    }
    
    .welcome-screen .welcome-content .course-svg-icon {
        width: 64px;
        height: 64px;
    }
    
    .welcome-screen .welcome-content .course-icon i {
        font-size: 48px;
    }
    
    .course-icons {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        padding: 0 15px;
    }
    
    .course-icon {
        width: 150px;
        min-height: 110px;
        padding: 18px 12px;
    }
}
    

    
    .course-icon i {
        font-size: 36px;
    }
    
    .course-svg-icon {
        width: 36px !important;
        height: 36px !important;
    }
    
    .chatbot-iframe-container {
        width: 300px;
        height: 400px;
    }
    
    .modal-content {
        margin: 10px;
        max-height: 90vh;
    }
}

@media (max-width: 600px) {
    .course-icons {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        padding: 0 15px;
    }
    
    .course-icon {
        width: 140px;
        padding: 16px 10px;
        min-height: 100px;
    }
    
    .course-icon i {
        font-size: 32px;
    }
    
    .course-svg-icon {
        width: 32px !important;
        height: 32px !important;
    }
    
    .course-icon span {
        font-size: 13px;
        line-height: 1.2;
    }
}

@media (max-width: 480px) {
    .welcome-screen {
        padding: 20px 10px 40px 10px;
    }
    
    .welcome-screen .welcome-content h1 {
        font-size: 24px;
    }
    
    .course-welcome-icon {
        width: 48px;
        height: 48px;
    }
    
    .course-welcome-icon.fas {
        font-size: 48px;
    }
    
    .course-welcome .welcome-content h1 {
        font-size: 28px;
    }
    
    .welcome-screen .welcome-content .course-icon {
        width: 80px;
        height: 80px;
        margin-bottom: 20px;
        background: none;
        border: none;
        box-shadow: none;
    }
    
    .welcome-screen .welcome-content .course-svg-icon {
        width: 48px;
        height: 48px;
    }
    
    .welcome-screen .welcome-content .course-icon i {
        font-size: 36px;
    }
    
    .course-icons {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 0 20px;
    }
    
    .course-icon {
        width: 280px;
        max-width: calc(100vw - 60px);
        padding: 18px 15px;
        min-height: 90px;
        justify-self: center;
    }
    
    .course-icon span {
        font-size: 14px;
        line-height: 1.2;
        white-space: normal;
        word-break: break-word;
        hyphens: auto;
    }
    
    .chatbot-iframe-container {
        width: calc(100vw - 40px);
        height: 350px;
        right: -10px;
    }
    
    .main-tagline {
        font-size: 18px;
        letter-spacing: 2px;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.3s ease-in-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Loading States */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--text-secondary);
}

.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Additional form styling for the new login elements */

.remember-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #374151;
    user-select: none;
}

.remember-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    accent-color: #22c55e;
    cursor: pointer;
}

.checkmark {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid #d1d5db;
    border-radius: 3px;
    margin-right: 8px;
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
}

.remember-checkbox input[type="checkbox"]:checked + .checkmark {
    background-color: #22c55e;
    border-color: #22c55e;
}

.remember-checkbox input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: -2px;
    left: 2px;
    color: white;
    font-size: 12px;
    font-weight: bold;
}

/* Hide default checkbox when using custom checkmark */
.remember-checkbox input[type="checkbox"] {
    display: none;
}

.remember-checkbox .checkmark {
    display: inline-block;
}

/* Loading state for login button */
.login-btn.loading {
    position: relative;
    color: transparent;
}

.login-btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

/* Ensure content is always visible on desktop */
@media (min-width: 1025px) {
    .content-area {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        width: auto !important;
        flex: 1 !important;
    }
    
    .course-welcome {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    .course-welcome.hidden {
        display: none !important;
    }
}

/* Clean course welcome icons for all themes - no additional styling needed */