/* ===== ELEVATE LEARNING DESIGN SYSTEM ===== */

/* ===== CRITICAL: Base HTML/Body styles for sticky header support ===== */
/* CONSOLIDATED: Single declaration to prevent CSS cascade override issues */
html, body {
    /* CRITICAL: NO overflow hidden - breaks position:sticky */
    overflow-x: hidden;  /* Prevent horizontal scroll only */
    overflow-y: auto !important;  /* MUST allow vertical scroll for sticky */

    /* CRITICAL: NO transform/perspective - breaks sticky */
    transform: none !important;
    perspective: none !important;

    /* Layout */
    margin: 0;
    padding: 0;
    min-width: 320px;  /* Minimum mobile width */
    height: auto !important;
    min-height: 100vh;

    /* Typography */
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--gray-50);

    /* Performance */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* CSS Custom Properties - Design Tokens */
:root {
    /* Primary Colors - Enhanced modern palette */
    --primary: #6C3CE1;
    --primary-color: #6C3CE1;
    --primary-hover: #8710d8;
    --primary-light: #f7ecff;
    --primary-dark: #7c2d93;
    
    /* Secondary Colors - Modern neutral tones */
    --secondary-color: #2d2f31;
    --secondary-light: #4f4f4f;
    --accent-color: #0f7c90;
    
    /* Neutral Colors - Modern grays */
    --white: #ffffff;
    --gray-50: #f7f9fa;
    --gray-100: #f2f3f5;
    --gray-200: #e4e8eb;
    --gray-300: #d1d7db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #3c4043;
    --gray-800: #2d2f31;
    --gray-900: #1c1d1f;
    
    /* Status Colors */
    --success: #28a745;
    --warning: #ffc107;
    --error: #dc3545;
    --info: #17a2b8;
    
    /* Layout Variables */
    --sidebar-width: 280px;
    --sidebar-width-collapsed: 60px;
    --header-height: 64px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Typography - Modern font stack */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ===== BASE STYLES ===== */
* {
    box-sizing: border-box;
}

/* html, body styles moved to top (lines 3-29) to consolidate and prevent cascade issues */

/* ===== TYPOGRAPHY HIERARCHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
}

h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

h5 {
    font-size: var(--font-size-base);
    font-weight: 600;
}

h6 {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

p {
    margin-bottom: var(--space-4);
    color: var(--gray-700);
    line-height: 1.6;
}

.text-muted {
    color: var(--gray-600) !important;
}

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

.fw-bold {
    font-weight: 700 !important;
}

/* ===== UTILITY CLASSES ===== */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.text-truncate {
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

/* ===== ACCESSIBILITY & FOCUS STYLES ===== */
.focus-visible,
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

/* Enhanced focus states for interactive elements */
.btn:focus-visible,
.nav-link:focus-visible,
.category-card:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(164, 53, 240, 0.1);
}

.course-card:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(164, 53, 240, 0.1);
}

/* Skip links for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    z-index: 9999;
    border-radius: var(--border-radius);
}

.skip-link:focus {
    top: 6px;
}

/* High contrast mode enhancements */
@media (prefers-contrast: high) {
    .course-card {
        border-width: 2px;
    }
    
    .btn {
        border-width: 2px;
    }
    
    .category-card {
        border-width: 2px;
    }
}

/* ===== MAIN LAYOUT STYLES ===== */
.app-layout {
    display: flex;
    min-height: 100vh;
    background-color: var(--gray-50);
}

.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--white);
    border-right: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 1000;
    overflow-y: auto;
    transition: transform var(--transition-normal);
}

.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    background-color: var(--gray-50);
    transition: margin-left var(--transition-normal);
}

/* ===== HEADER STYLES ===== */
.app-header {
    height: var(--header-height);
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: var(--shadow-sm);
}

.app-content {
    padding: var(--space-6);
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - var(--header-height));
    position: relative;
}

/* ===== SIDEBAR NAVIGATION STYLES ===== */
.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    background-color: var(--white);
}

.sidebar-brand {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
}

.brand-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.sidebar-brand:hover {
    color: var(--primary-hover);
}

.sidebar-nav {
    padding: var(--space-4) 0;
}

.nav-section {
    margin-bottom: var(--space-6);
}

.nav-section-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    padding: 0 var(--space-6) var(--space-2) var(--space-6);
    margin: 0;
}

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

.nav-item {
    margin-bottom: var(--space-1);
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background-color: var(--primary-color);
}

.nav-icon {
    width: 20px;
    height: 20px;
    margin-right: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-base);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Large tablets and small desktops (1024px and down) */
@media (max-width: 1024px) {
    .app-content {
        padding: var(--space-4);
    }
}

/* Tablets (768px and down) */
@media (max-width: 768px) {
    .app-sidebar {
        transform: translateX(-100%);
    }
    
    .app-sidebar.sidebar-open {
        transform: translateX(0);
    }
    
    .app-main {
        margin-left: 0;
    }
    
    .app-content {
        padding: var(--space-4) var(--space-3);
    }
    
    .mobile-sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .mobile-sidebar-overlay.active {
        opacity: 1;
        visibility: visible;
    }
}

/* Mobile (480px and down) */
@media (max-width: 480px) {
    .app-header {
        padding: 0 var(--space-4);
    }
    
    .app-content {
        padding: var(--space-3) var(--space-2);
    }
    
    .sidebar-header {
        padding: 0 var(--space-4);
    }
    
    .nav-link {
        padding: var(--space-3) var(--space-4);
    }
    
    .nav-section-title {
        padding: 0 var(--space-4) var(--space-2) var(--space-4);
    }
}

/* ===== USER DROPDOWN STYLES ===== */
.user-dropdown {
    position: relative;
}

.user-dropdown .dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1050;
}

.user-dropdown .dropdown-item {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    color: var(--gray-700);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.user-dropdown .dropdown-item:hover {
    background-color: var(--gray-100);
}

.user-dropdown .dropdown-item i {
    margin-right: var(--space-2);
    width: 16px;
}

.user-dropdown .dropdown-divider {
    height: 1px;
    background-color: var(--gray-200);
    margin: var(--space-2) 0;
    border: none;
}

/* ===== MOBILE MENU BUTTON ===== */
.mobile-menu-button {
    display: none;
    background: none;
    border: none;
    color: var(--gray-700);
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--space-2);
    transition: color var(--transition-fast);
}

.mobile-menu-button:hover {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .mobile-menu-button {
        display: block;
    }
}

/* ===== BUTTON STYLES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1.5;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

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

.btn-outline-primary {
    background-color: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* ===== CARD STYLES ===== */
.card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

/* ===== LOADING STATES ===== */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* ===== ERROR UI ===== */
.blazor-error-ui {
    background: var(--error);
    bottom: 0;
    box-shadow: var(--shadow-lg);
    display: none;
    left: 0;
    padding: var(--space-4);
    position: fixed;
    right: 0;
    z-index: 1000;
    color: var(--white);
    font-weight: 500;
}

.blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--white);
    text-decoration: none;
    font-size: var(--font-size-lg);
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-width: 2px;
        --shadow-sm: 0 0 0 1px var(--gray-800);
        --shadow-md: 0 0 0 2px var(--gray-800);
        --shadow-lg: 0 0 0 3px var(--gray-800);
    }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1f2937;
        --gray-50: #111827;
        --gray-100: #1f2937;
        --gray-200: #374151;
        --gray-300: #4b5563;
        --gray-400: #6b7280;
        --gray-500: #9ca3af;
        --gray-600: #d1d5db;
        --gray-700: #e5e7eb;
        --gray-800: #f3f4f6;
        --gray-900: #ffffff;
    }
}

/* ===== ADMIN NOTIFICATION STYLES ===== */
@keyframes loading-progress {
    0% { transform: translateX(-100%); }
    50% { transform: translateX(0); }
    100% { transform: translateX(100%); }
}

@keyframes timer-countdown {
    from { width: 100%; }
    to { width: 0%; }
}

/* Admin notification mobile responsive */
@media (max-width: 768px) {
    .admin-notifications {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }

    .notification-content {
        padding: var(--space-3);
    }

    .notification-title {
        font-size: var(--font-size-xs);
    }

    .notification-message {
        font-size: var(--font-size-xs);
    }
}

/* Admin notification dark mode support */
@media (prefers-color-scheme: dark) {
    .notification {
        background: var(--gray-800);
        color: var(--gray-100);
    }

    .notification-title {
        color: var(--gray-100);
    }
}

/* ===== ADMIN DASHBOARD RESPONSIVE STYLES ===== */
@media (max-width: 992px) {
    .stats-card {
        margin-bottom: var(--space-3);
    }
}

@media (max-width: 768px) {
    .admin-dashboard {
        padding: var(--space-3);
        display: flex;
        flex-direction: column;
    }
    
    .dashboard-header {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: var(--space-4);
    }
    
    .dashboard-header h1 {
        font-size: 1.5rem;
        margin-bottom: var(--space-2);
    }
    
    .dashboard-header-actions {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-2);
        width: 100%;
    }
}

/* ===== ADMIN COURSE MANAGEMENT RESPONSIVE STYLES ===== */
@media (max-width: 768px) {
    .course-filters .row > div {
        margin-bottom: var(--space-3);
    }
    
    .course-card {
        margin-bottom: var(--space-3);
    }
}

@media (max-width: 576px) {
    .course-management {
        padding: var(--space-2);
    }
}

/* ===== ADMIN CATEGORY MANAGEMENT RESPONSIVE STYLES ===== */
@media (max-width: 768px) {
    .category-tree {
        font-size: var(--font-size-sm);
    }
}

/* ===== HOMEPAGE STYLES ===== */

/* Featured Courses Section */
.featured-courses-section {
    padding: var(--space-12) 0;
}

.course-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
}

.course-image {
    position: relative;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 169px;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.course-duration {
    position: absolute;
    bottom: var(--space-2);
    right: var(--space-2);
}

.course-duration .badge {
    background: rgba(0, 0, 0, 0.7) !important;
    color: var(--white);
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
}

.course-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-category .badge {
    background: var(--gray-100) !important;
    color: var(--gray-700);
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding: var(--space-1) var(--space-2);
}

.course-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.4;
    margin-bottom: var(--space-2);
    flex: 1;
}

.course-instructor {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin-bottom: var(--space-2);
}

.course-rating {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-3);
}

.course-rating .text-warning {
    font-weight: 600;
}

.course-price {
    margin-top: auto;
}

.current-price {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--gray-900);
}

.original-price {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #fafbfc 0%, #f8f9fa 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 40%;
    height: 100%;
    background: linear-gradient(45deg, rgba(164, 53, 240, 0.05) 0%, rgba(0, 123, 255, 0.05) 100%);
    z-index: 1;
}

.min-vh-75 {
    min-height: 75vh;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: var(--space-8) 0;
}

.hero-badge .badge {
    background: linear-gradient(45deg, #6C3CE1, #007bff);
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: 50px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: none;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
}

.text-gradient {
    background: linear-gradient(45deg, #6C3CE1, #007bff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    line-height: 1.7;
    max-width: 600px;
}

.hero-features {
    margin: var(--space-8) 0;
}

.hero-features .feature-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-3);
    font-size: var(--font-size-base);
    color: var(--gray-700);
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image-container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: auto;
}

.hero-image-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(164, 53, 240, 0.1) 0%, rgba(0, 123, 255, 0.1) 100%);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.hero-icon-grid {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
}

.hero-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    font-size: 1.5rem;
    animation: float 4s ease-in-out infinite;
}

.hero-icon:nth-child(1) { top: 0; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.hero-icon:nth-child(2) { top: 25%; right: 0; animation-delay: 0.5s; }
.hero-icon:nth-child(3) { bottom: 25%; right: 0; animation-delay: 1s; }
.hero-icon:nth-child(4) { bottom: 0; left: 50%; transform: translateX(-50%); animation-delay: 1.5s; }
.hero-icon:nth-child(5) { bottom: 25%; left: 0; animation-delay: 2s; }
.hero-icon:nth-child(6) { top: 25%; left: 0; animation-delay: 2.5s; }

.hero-floating-card {
    position: absolute;
    top: 20%;
    right: -20px;
    animation: float 5s ease-in-out infinite;
    animation-delay: 1s;
}

.avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Stats Section */
.stats-section {
    padding: var(--space-12) 0;
    background: var(--white);
    border-top: 1px solid var(--gray-200);
    border-bottom: 1px solid var(--gray-200);
}

.stat-item {
    padding: var(--space-6) var(--space-4);
    text-align: center;
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.stat-label {
    color: var(--gray-600);
    font-size: var(--font-size-base);
    font-weight: 500;
    margin: 0;
}

/* Categories Section */
.categories-section {
    padding: var(--space-12) 0;
    background: var(--gray-50);
}

.section-header {
    margin-bottom: var(--space-10);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.category-card {
    display: block;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-normal);
    height: 100%;
    position: relative;
    overflow: hidden;
}

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

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
    text-decoration: none;
    color: inherit;
}

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

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: var(--space-4);
    transition: transform var(--transition-normal);
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.category-description {
    color: var(--gray-600);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-sm);
}

.category-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-count {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    font-weight: 600;
}

.category-arrow {
    color: var(--gray-400);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
}

.category-card:hover .category-arrow {
    color: var(--primary-color);
    transform: translateX(4px);
}

.text-purple {
    color: #6f42c1 !important;
}

/* Features Section */
.features-section {
    padding: var(--space-12) 0;
}

.features-section .feature-item {
    margin-bottom: var(--space-6);
}

.features-section .feature-icon {
    flex-shrink: 0;
}

.learning-image {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* Homepage Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .hero-visual {
        margin-top: var(--space-8);
    }
    
    .hero-image-container {
        width: 300px;
        height: 300px;
    }
    
    .hero-floating-card {
        position: static;
        margin-top: var(--space-6);
        animation: none;
    }
    
    .stat-item {
        padding: var(--space-4) var(--space-2);
    }
    
    .category-card,
    .course-card {
        margin-bottom: var(--space-4);
    }
    
    .course-card:hover {
        transform: none;
    }
    
    .featured-courses-section {
        padding: var(--space-8) 0;
    }
}

@media (max-width: 480px) {
    .hero-content {
        text-align: center;
    }
    
    .hero-features {
        text-align: left;
        margin: var(--space-6) 0;
    }
}

/* Print styles */
@media print {
    .app-sidebar,
    .mobile-menu-button,
    .user-dropdown {
        display: none !important;
    }
    
    .app-main {
        margin-left: 0 !important;
    }
    
    * {
        box-shadow: none !important;
    }
}

/* ===== ELEGANT ERROR NOTIFICATION SYSTEM ===== */

/* Non-invasive error notification positioned as elegant toast */
.elegant-error-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    max-width: 420px;
    pointer-events: auto;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.elegant-error-notification[style*="display: block"], 
.elegant-error-notification:not([style*="display: none"]) {
    opacity: 1;
    transform: translateX(0);
}

.error-toast {
    background: white;
    border-radius: 12px;
    box-shadow: 0 12px 28px -5px rgba(0, 0, 0, 0.1), 0 8px 16px -8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    border-left: 4px solid #ff6b6b;
    position: relative;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.error-toast .toast-header {
    display: flex;
    align-items: flex-start;
    padding: 16px 16px 12px 16px;
    gap: 12px;
    background: linear-gradient(145deg, #fff 0%, #fafbfc 100%);
}

.error-toast .toast-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ff6b6b;
    font-size: 1.1rem;
    margin-top: 2px;
}

.error-toast .toast-content {
    flex: 1;
    min-width: 0;
}

.error-toast .toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: #1a1a1a;
    margin-bottom: 4px;
    line-height: 1.3;
}

.error-toast .toast-message {
    font-size: 0.875rem;
    color: #6b7280;
    line-height: 1.4;
    margin: 0;
}

.error-toast .toast-actions {
    display: flex;
    align-items: flex-start;
    gap: 4px;
    margin-top: -4px;
}

.error-action-btn {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.error-action-btn:hover {
    background: #f3f4f6;
    color: #374151;
    transform: scale(1.05);
}

.retry-btn:hover {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.dismiss-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.connection-status {
    padding: 12px 16px 16px 16px;
    background: #f8f9fa;
    border-top: 1px solid #e9ecef;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #fbbf24;
    animation: pulse-warning 2s ease-in-out infinite;
}

.status-text {
    font-size: 0.8rem;
    color: #6b7280;
    font-weight: 500;
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.toast-progress .progress-bar {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #ff6b6b, #fbbf24);
    animation: toast-countdown linear forwards;
    transform-origin: left;
}

@keyframes pulse-warning {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes toast-countdown {
    from { width: 100%; }
    to { width: 0%; }
}

/* Connection recovered state */
.elegant-error-notification.connection-recovered .status-dot {
    background: #10b981;
    animation: pulse-success 1s ease-in-out 3;
}

.elegant-error-notification.connection-recovered .status-text {
    color: #10b981;
}

@keyframes pulse-success {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.2); }
}

/* Mobile responsive design */
@media (max-width: 768px) {
    .elegant-error-notification {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
    }

    .error-toast .toast-header {
        padding: 12px;
        gap: 10px;
    }

    .error-toast .toast-title {
        font-size: 0.9rem;
    }

    .error-toast .toast-message {
        font-size: 0.8rem;
    }

    .connection-status {
        padding: 10px 12px;
    }

    .error-action-btn {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .error-toast {
        background: #1f2937;
        border-color: #374151;
        color: #f9fafb;
    }

    .error-toast .toast-header {
        background: linear-gradient(145deg, #1f2937 0%, #111827 100%);
    }

    .error-toast .toast-title {
        color: #f9fafb;
    }

    .error-toast .toast-message {
        color: #d1d5db;
    }

    .connection-status {
        background: #111827;
        border-top-color: #374151;
    }

    .error-action-btn:hover {
        background: #374151;
        color: #f9fafb;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    .elegant-error-notification {
        transition: opacity 0.2s ease;
    }

    .elegant-error-notification[style*="display: block"], 
    .elegant-error-notification:not([style*="display: none"]) {
        transform: none;
    }

    .status-dot {
        animation: none;
    }

    .toast-progress .progress-bar {
        animation: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .error-toast {
        border: 2px solid #ff6b6b;
        box-shadow: none;
    }

    .error-action-btn {
        border: 1px solid currentColor;
    }
}

/* Error Boundary Styles */
.error-boundary-container .card {
    border: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.error-boundary-container .error-icon {
    background: rgba(255, 193, 7, 0.1);
    border-radius: 50%;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

/* Error State Components */
.error-state-component .alert {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.error-state-component .btn {
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
}

/* Error Recovery Flow */
.error-recovery-flow .card {
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: none;
}

.error-recovery-flow .list-group-item {
    border: none;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

.error-recovery-flow .list-group-item:hover {
    background-color: var(--gray-50);
    transform: translateX(4px);
}

/* Mobile responsiveness */
@media (max-width: 576px) {
    .blazor-error-ui {
        padding: 0.5rem;
    }
    
    .blazor-error-ui .error-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .blazor-error-ui .error-actions {
        width: 100%;
        justify-content: center;
    }
    
    .error-boundary-container .error-icon {
        width: 60px;
        height: 60px;
    }
    
    .error-state-component .d-flex.gap-2 {
        flex-direction: column;
    }
    
    .error-state-component .btn,
    .error-recovery-flow .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}

/* ===== LAZY LOADING SECTION STYLES (v3.14.0) ===== */
.lazy-section {
    position: relative;
    width: 100%;
}

.lazy-section.loading .lazy-section-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: lazy-shimmer 2s infinite;
    border-radius: 4px;
}

@keyframes lazy-shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.lazy-section.loaded .lazy-section-placeholder {
    display: none;
}

.lazy-section-spinner {
    color: var(--primary, #6C3CE1);
}

/* Footer styles removed - now defined in layout.css and MainLayout.razor inline styles */

/* ===== PREMIUM HEADER STYLES ===== */
.main-header-premium {
    height: 72px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.main-header-container-premium {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.header-logo-section-premium {
    display: flex;
    align-items: center;
}

.logo-link-premium {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #1a1a1a;
    transition: all 0.2s ease;
}

.logo-link-premium:hover {
    transform: scale(1.02);
}

.logo-image-premium {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.logo-text-premium {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-nav-section {
    display: flex;
    align-items: center;
}

.nav-links-premium {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link-premium {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 10px;
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
    position: relative;
}

.nav-link-premium:hover {
    background: rgba(108, 60, 225, 0.05);
    color: #6C3CE1;
}

.nav-link-premium i {
    font-size: 14px;
}

/* Categorie: distinct dropdown button */
.nav-link-categorie {
    background: #6C3CE1 !important;
    color: #ffffff !important;
    border-radius: 10px;
}

.nav-link-categorie:hover {
    background: #5a30c4 !important;
    color: #ffffff !important;
    transform: none;
}

.nav-link-categorie i {
    color: #ffffff;
}

.nav-chevron {
    font-size: 10px !important;
    opacity: 0.8;
    margin-left: 2px;
}

.header-search-section-premium {
    flex: 1;
    max-width: 480px;
    margin: 0 16px 0 24px;
}

.search-form-premium {
    width: 100%;
}

.search-input-wrapper-premium {
    position: relative;
    width: 100%;
}

.search-icon-premium {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
    font-size: 16px;
    z-index: 1;
}

.search-input-premium {
    width: 100%;
    padding: 12px 48px;
    border: 2px solid rgba(0, 0, 0, 0.06);
    border-radius: 16px;
    font-size: 14px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    outline: none;
}

.search-input-premium:focus {
    border-color: #6C3CE1;
    background: white;
    box-shadow: 0 0 0 4px rgba(108, 60, 225, 0.1);
}

.header-actions-section-premium {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-toggle-premium {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 12px;
    color: #4a5568;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-menu-toggle-premium:hover {
    background: rgba(0, 0, 0, 0.08);
    transform: scale(1.05);
}

.user-menu-container-premium {
    position: relative;
}

.user-menu-trigger-premium {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border: none;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.user-menu-trigger-premium:hover {
    background: rgba(0, 0, 0, 0.08);
    transform: scale(1.02);
}

.user-avatar-premium {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.user-info-premium {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.user-name-premium {
    font-weight: 600;
    font-size: 14px;
    color: #1a1a1a;
    line-height: 1.2;
}

.user-dropdown-premium {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 240px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(0, 0, 0, 0.06);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s ease;
}

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

.dropdown-section-premium {
    padding: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.dropdown-section-premium:last-child {
    border-bottom: none;
}

.dropdown-section-title-premium {
    font-size: 12px;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.dropdown-section-title-premium i {
    color: #6C3CE1;
}

.dropdown-item-premium {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    color: #374151;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    border-radius: 8px;
    padding-left: 8px;
    padding-right: 8px;
}

.dropdown-item-premium:hover {
    background: rgba(108, 60, 225, 0.05);
    color: #6C3CE1;
    transform: translateX(4px);
}

.dropdown-item-premium i {
    width: 18px;
    color: #9ca3af;
    transition: color 0.2s ease;
}

.dropdown-item-premium:hover i {
    color: #6C3CE1;
}

.dropdown-divider-premium {
    height: 1px;
    background: rgba(0, 0, 0, 0.06);
    margin: 8px 0;
}

.logout-item {
    color: #dc2626 !important;
}

.logout-item:hover {
    background: rgba(220, 38, 38, 0.05) !important;
    color: #dc2626 !important;
}

.logout-item i {
    color: #dc2626 !important;
}

.auth-buttons-premium {
    display: flex;
    align-items: center;
    gap: 12px;
}

.auth-link-premium {
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.login-link {
    color: #6C3CE1;
    background: rgba(108, 60, 225, 0.05);
}

.login-link:hover {
    background: rgba(108, 60, 225, 0.1);
    transform: translateY(-1px);
}

.register-link {
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    color: white;
    box-shadow: 0 4px 12px rgba(108, 60, 225, 0.3);
}

.register-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(108, 60, 225, 0.4);
}

/* ===== CATEGORIES MEGA DROPDOWN ===== */
.nav-dropdown-container {
    position: relative;
}

.nav-link-categorie {
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.nav-chevron.rotated {
    transform: rotate(180deg);
}

.nav-chevron {
    transition: transform 0.2s ease;
}

.categories-mega-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    width: 680px;
    max-width: none;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.04);
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
    z-index: 100;
    overflow: hidden;
}

.categories-mega-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.mega-dropdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 4px;
    padding: 20px;
}

.mega-dropdown-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border-radius: 12px;
    text-decoration: none;
    color: #1a1a1a;
    transition: all 0.2s ease;
}

.mega-dropdown-item:hover {
    background: rgba(108, 60, 225, 0.04);
    transform: translateX(4px);
}

.mega-item-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.mega-item-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mega-item-title {
    font-weight: 600;
    font-size: 14px;
    color: #1a1a1a;
}

.mega-item-desc {
    font-size: 12px;
    color: #9ca3af;
}

.mega-dropdown-footer {
    padding: 12px 16px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    background: rgba(0, 0, 0, 0.01);
}

.mega-footer-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px;
    border-radius: 8px;
    text-decoration: none;
    color: #6C3CE1;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
}

.mega-footer-link:hover {
    background: rgba(108, 60, 225, 0.05);
}

/* ===== HEADER ICON BUTTONS (Cart, Notifications) ===== */
.header-icon-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: none;
    background: transparent;
    color: #6b7280;
    font-size: 17px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.header-icon-btn:hover {
    background: rgba(108, 60, 225, 0.06);
    color: #6C3CE1;
}

.header-icon-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    font-size: 10px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

/* ===== SEARCH KBD SHORTCUT ===== */
.search-kbd {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    padding: 2px 8px;
    font-size: 11px;
    font-family: inherit;
    color: #9ca3af;
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 6px;
    pointer-events: none;
}

/* ===== USER DROPDOWN HEADER ===== */
.dropdown-user-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 16px 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.dropdown-user-name {
    font-weight: 600;
    font-size: 14px;
    color: #1a1a1a;
}

.dropdown-user-email {
    font-size: 12px;
    color: #9ca3af;
}

/* ===== USER ROLE LABEL ===== */
.user-role-premium {
    font-size: 11px;
    color: #9ca3af;
    line-height: 1;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay-premium {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-menu-overlay-premium.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-premium {
    position: absolute;
    top: 0;
    right: 0;
    width: 320px;
    max-width: 90vw;
    height: 100vh;
    background: white;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.mobile-menu-overlay-premium.active .mobile-menu-premium {
    transform: translateX(0);
}

.mobile-menu-header-premium {
    display: flex;
    align-items: center;
    justify-between;
    padding: 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.mobile-logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #1a1a1a;
}

.mobile-logo-link img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.mobile-close-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 12px;
    color: #4a5568;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-close-btn:hover {
    background: rgba(0, 0, 0, 0.08);
}

.mobile-nav-premium {
    padding: 16px 0;
}

.mobile-nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    color: #374151;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s ease;
    border-radius: 12px;
    margin: 4px 16px;
}

.mobile-nav-item:hover {
    background: rgba(108, 60, 225, 0.05);
    color: #6C3CE1;
    transform: translateX(4px);
}

.mobile-nav-item i {
    width: 20px;
    color: #9ca3af;
    transition: color 0.2s ease;
}

.mobile-nav-item:hover i {
    color: #6C3CE1;
}

.mobile-auth-section {
    padding: 24px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.mobile-user-info {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 12px;
}

.mobile-user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 16px;
}

.mobile-user-name {
    font-weight: 600;
    font-size: 16px;
    color: #1a1a1a;
}

.mobile-auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mobile-auth-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.login-btn {
    color: #6C3CE1;
    background: rgba(108, 60, 225, 0.05);
    border: 2px solid rgba(108, 60, 225, 0.1);
}

.login-btn:hover {
    background: rgba(108, 60, 225, 0.1);
    transform: translateY(-1px);
}

.register-btn {
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    color: white;
    box-shadow: 0 4px 12px rgba(108, 60, 225, 0.3);
}

.register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(108, 60, 225, 0.4);
}

.mobile-logout-form {
    margin-top: 16px;
}

.mobile-logout-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    border: 2px solid rgba(220, 38, 38, 0.2);
    background: rgba(220, 38, 38, 0.05);
    color: #dc2626;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-logout-btn:hover {
    background: rgba(220, 38, 38, 0.1);
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .header-search-section-premium {
        margin: 0 16px;
        max-width: 300px;
    }

    .nav-links-premium {
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .main-header-container-premium {
        padding: 0 16px;
    }

    .header-nav-section,
    .header-search-section-premium,
    .desktop-only {
        display: none !important;
    }

    .mobile-menu-toggle-premium {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .logo-text-premium {
        display: none;
    }

    .mobile-menu-overlay-premium {
        top: 72px;
    }

    .categories-mega-dropdown {
        width: 90vw;
        max-width: none;
        left: 50%;
    }

    .mega-dropdown-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .main-header-container-premium {
        padding: 0 12px;
    }

    .mobile-menu-premium {
        width: 100vw;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .main-header-premium {
        background: rgba(26, 26, 26, 0.95);
        border-bottom-color: rgba(255, 255, 255, 0.06);
    }

    .logo-link-premium,
    .mobile-logo-link {
        color: #f5f5f5;
    }

    .nav-link-premium {
        color: #d1d5db;
    }

    .nav-link-premium:hover {
        background: rgba(108, 60, 225, 0.1);
        color: #ddd6fe;
    }

    .search-input-premium {
        background: rgba(55, 65, 81, 0.8);
        border-color: rgba(255, 255, 255, 0.1);
        color: #f5f5f5;
    }

    .search-input-premium:focus {
        background: #374151;
        border-color: #6C3CE1;
    }

    .user-dropdown-premium {
        background: #1f2937;
        border-color: rgba(255, 255, 255, 0.06);
    }

    .dropdown-item-premium {
        color: #d1d5db;
    }

    .dropdown-item-premium:hover {
        background: rgba(108, 60, 225, 0.1);
        color: #ddd6fe;
    }

    .mobile-menu-premium {
        background: #1f2937;
    }

    .mobile-nav-item {
        color: #d1d5db;
    }

    .mobile-nav-item:hover {
        background: rgba(108, 60, 225, 0.1);
        color: #ddd6fe;
    }
}

/* ===== PREMIUM COURSE CARD STYLES ===== */
.course-card-premium {
    background: white;
    border: 2px solid rgba(0, 0, 0, 0.04);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    cursor: pointer;
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.course-card-premium:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: rgba(108, 60, 225, 0.2);
}

.course-card-premium:focus-visible {
    outline: 2px solid #6C3CE1;
    outline-offset: 4px;
}

.course-thumbnail-premium {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.course-thumbnail-premium img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.course-card-premium:hover .course-thumbnail-premium img {
    transform: scale(1.1);
}

.course-duration-badge-premium {
    position: absolute;
    bottom: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.course-badge-premium {
    position: absolute;
    top: 12px;
    left: 12px;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(108, 60, 225, 0.3);
}

.course-overlay-premium {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(108, 60, 225, 0.1) 0%, rgba(201, 169, 110, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card-premium:hover .course-overlay-premium {
    opacity: 1;
}

.course-play-btn-premium {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6C3CE1;
    font-size: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.course-card-premium:hover .course-play-btn-premium {
    transform: scale(1);
}

.course-content-premium {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 12px;
}

.course-category-premium {
    background: linear-gradient(135deg, rgba(108, 60, 225, 0.1), rgba(201, 169, 110, 0.1));
    color: #6C3CE1;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    align-self: flex-start;
    border: 1px solid rgba(108, 60, 225, 0.15);
}

.course-title-premium {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    line-height: 1.3;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-instructor-premium {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #6b7280;
}

.instructor-avatar-premium {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 12px;
    flex-shrink: 0;
}

.instructor-initials-premium {
    font-size: 12px;
}

.course-rating-premium {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.rating-stars-premium {
    display: flex;
    gap: 2px;
}

.star-premium {
    color: #fbbf24;
    font-size: 12px;
}

.star-premium.empty {
    color: #d1d5db;
}

.rating-number-premium {
    font-weight: 600;
    color: #1a1a1a;
}

.rating-count-premium {
    color: #6b7280;
    font-size: 12px;
}

.course-meta-premium {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: #6b7280;
}

.course-lesson-count-premium,
.course-duration-premium {
    display: flex;
    align-items: center;
    gap: 6px;
}

.course-lesson-count-premium i,
.course-duration-premium i {
    color: #9ca3af;
    font-size: 12px;
}

.course-price-premium {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.current-price-premium {
    font-size: 20px;
    font-weight: 800;
    color: #1a1a1a;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.original-price-premium {
    font-size: 14px;
    color: #9ca3af;
    text-decoration: line-through;
}

.discount-badge-premium {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .course-card-premium {
        border-radius: 16px;
    }

    .course-content-premium {
        padding: 16px;
        gap: 10px;
    }

    .course-title-premium {
        font-size: 16px;
    }

    .course-meta-premium {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .current-price-premium {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .course-card-premium:hover {
        transform: translateY(-4px) scale(1.01);
    }

    .course-play-btn-premium {
        width: 48px;
        height: 48px;
        font-size: 16px;
    }

    .course-content-premium {
        padding: 12px;
    }

    .course-title-premium {
        font-size: 14px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .course-card-premium {
        background: #1f2937;
        border-color: rgba(255, 255, 255, 0.08);
    }

    .course-duration-badge-premium {
        background: rgba(0, 0, 0, 0.6);
    }

    .course-overlay-premium {
        background: linear-gradient(135deg, rgba(108, 60, 225, 0.15) 0%, rgba(201, 169, 110, 0.15) 100%);
    }

    .course-play-btn-premium {
        background: rgba(31, 41, 55, 0.95);
        color: #ddd6fe;
    }

    .course-category-premium {
        background: linear-gradient(135deg, rgba(108, 60, 225, 0.2), rgba(201, 169, 110, 0.2));
        color: #ddd6fe;
        border-color: rgba(221, 214, 254, 0.3);
    }

    .course-title-premium {
        color: #f9fafb;
    }

    .course-instructor-premium {
        color: #9ca3af;
    }

    .rating-number-premium {
        color: #f9fafb;
    }

    .course-meta-premium {
        color: #9ca3af;
    }

    .current-price-premium {
        color: #f9fafb;
    }

    .original-price-premium {
        color: #6b7280;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .course-card-premium,
    .course-thumbnail-premium img,
    .course-overlay-premium,
    .course-play-btn-premium {
        transition: none;
    }

    .course-card-premium:hover {
        transform: none;
    }
}


/* ===== PREMIUM COURSE CARD STYLES ===== */
.course-card-premium {
    background: white;
    border: 2px solid rgba(0, 0, 0, 0.04);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    cursor: pointer;
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.course-card-premium:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: rgba(108, 60, 225, 0.2);
}

.course-card-premium:focus-visible {
    outline: 2px solid #6C3CE1;
    outline-offset: 4px;
}

.course-thumbnail-premium {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.course-thumbnail-premium img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.course-card-premium:hover .course-thumbnail-premium img {
    transform: scale(1.1);
}

.course-duration-badge-premium {
    position: absolute;
    bottom: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.course-badge-premium {
    position: absolute;
    top: 12px;
    left: 12px;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(108, 60, 225, 0.3);
}

.course-overlay-premium {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(108, 60, 225, 0.1) 0%, rgba(201, 169, 110, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card-premium:hover .course-overlay-premium {
    opacity: 1;
}

.course-play-btn-premium {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6C3CE1;
    font-size: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.course-card-premium:hover .course-play-btn-premium {
    transform: scale(1);
}

.course-content-premium {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 12px;
}

.course-category-premium {
    background: linear-gradient(135deg, rgba(108, 60, 225, 0.1), rgba(201, 169, 110, 0.1));
    color: #6C3CE1;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    align-self: flex-start;
    border: 1px solid rgba(108, 60, 225, 0.15);
}

.course-title-premium {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    line-height: 1.3;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-instructor-premium {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #6b7280;
}

.instructor-avatar-premium {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 12px;
    flex-shrink: 0;
}

.instructor-initials-premium {
    font-size: 12px;
}

.course-rating-premium {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.rating-stars-premium {
    display: flex;
    gap: 2px;
}

.star-premium {
    color: #fbbf24;
    font-size: 12px;
}

.star-premium.empty {
    color: #d1d5db;
}

.rating-number-premium {
    font-weight: 600;
    color: #1a1a1a;
}

.rating-count-premium {
    color: #6b7280;
    font-size: 12px;
}

.course-meta-premium {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: #6b7280;
}

.course-lesson-count-premium,
.course-duration-premium {
    display: flex;
    align-items: center;
    gap: 6px;
}

.course-lesson-count-premium i,
.course-duration-premium i {
    color: #9ca3af;
    font-size: 12px;
}

.course-price-premium {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.current-price-premium {
    font-size: 20px;
    font-weight: 800;
    color: #1a1a1a;
    background: linear-gradient(135deg, #6C3CE1, #C9A96E);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.original-price-premium {
    font-size: 14px;
    color: #9ca3af;
    text-decoration: line-through;
}

.discount-badge-premium {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .course-card-premium {
        border-radius: 16px;
    }

    .course-content-premium {
        padding: 16px;
        gap: 10px;
    }

    .course-title-premium {
        font-size: 16px;
    }

    .course-meta-premium {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .current-price-premium {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .course-card-premium:hover {
        transform: translateY(-4px) scale(1.01);
    }

    .course-play-btn-premium {
        width: 48px;
        height: 48px;
        font-size: 16px;
    }

    .course-content-premium {
        padding: 12px;
    }

    .course-title-premium {
        font-size: 14px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .course-card-premium {
        background: #1f2937;
        border-color: rgba(255, 255, 255, 0.08);
    }

    .course-duration-badge-premium {
        background: rgba(0, 0, 0, 0.6);
    }

    .course-overlay-premium {
        background: linear-gradient(135deg, rgba(108, 60, 225, 0.15) 0%, rgba(201, 169, 110, 0.15) 100%);
    }

    .course-play-btn-premium {
        background: rgba(31, 41, 55, 0.95);
        color: #ddd6fe;
    }

    .course-category-premium {
        background: linear-gradient(135deg, rgba(108, 60, 225, 0.2), rgba(201, 169, 110, 0.2));
        color: #ddd6fe;
        border-color: rgba(221, 214, 254, 0.3);
    }

    .course-title-premium {
        color: #f9fafb;
    }

    .course-instructor-premium {
        color: #9ca3af;
    }

    .rating-number-premium {
        color: #f9fafb;
    }

    .course-meta-premium {
        color: #9ca3af;
    }

    .current-price-premium {
        color: #f9fafb;
    }

    .original-price-premium {
        color: #6b7280;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .course-card-premium,
    .course-thumbnail-premium img,
    .course-overlay-premium,
    .course-play-btn-premium {
        transition: none;
    }

    .course-card-premium:hover {
        transform: none;
    }
}