:root {
    /* PDCA Brand Colors - Based on Logo */
    --primary-color: #059669;
    --primary-dark: #047857;
    --primary-light: #10b981;
    --secondary-color: #0d9488;
    --accent-color: #dc2626;
    
    /* Extended Brand Colors */
    --success-color: #059669;
    --warning-color: #f59e0b;
    --error-color: #dc2626;
    --info-color: #0891b2;
    
    /* Neutral Colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    
    /* Dark Mode Colors */
    --dark-bg-primary: #0f1419;
    --dark-bg-secondary: #1f2937;
    --dark-bg-tertiary: #374151;
    --dark-text-primary: #f9fafb;
    --dark-text-secondary: #d1d5db;
    --dark-border: #374151;
    
    /* Brand Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    --gradient-accent: linear-gradient(135deg, var(--accent-color), #f97316);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

/* Dark Mode Support */
[data-theme="dark"] {
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-tertiary: var(--dark-bg-tertiary);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --border-color: var(--dark-border);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition-normal);
}

/* Modern Navigation Header */
.modern-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.modern-nav {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.nav-logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}

.user-avatar:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.notification-btn {
    position: relative;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition-fast);
}

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

.notification-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent-color);
    color: white;
    font-size: 0.625rem;
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-full);
    font-weight: 700;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    color: white;
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Modern Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--border-color);
}

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

.btn-success {
    background: var(--secondary-color);
    color: white;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
}

/* Course Cards Grid */
.courses-section {
    padding: 4rem 0;
}

.section-header {
    max-width: 1280px;
    margin: 0 auto 3rem;
    padding: 0 1.5rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.courses-grid {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

/* Modern Course Card */
.course-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.course-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--gradient-secondary);
}

/* ===== ENHANCED COURSE CARD STYLES ===== */
.course-title-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition-normal);
}

.course-title-link:hover {
    text-decoration: none;
    color: inherit;
}

.course-title-container {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.course-lock-icon {
    color: #e74c3c;
    font-size: 16px;
    margin-top: 2px;
    flex-shrink: 0;
}

.course-title-content {
    flex: 1;
}

.course-title-text {
    font-weight: 600;
    line-height: 1.3;
    margin: 0;
}

.course-title-text--locked {
    color: #666;
}

.course-title-text--unlocked {
    color: #2c3e50;
}

.course-status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 6px;
}

.course-status-badge--locked {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
}

.course-status-badge--unlocked {
    background: linear-gradient(135deg, #00b894, #00a085);
    color: white;
}

.course-status-badge__icon {
    font-size: 10px;
    margin-right: 4px;
}

.course-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.course-action-btn:hover {
    text-decoration: none;
    transform: scale(1.1);
}

.course-action-btn:focus {
    outline: none;
    text-decoration: none;
}

.course-action-btn--locked {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

.course-action-btn--locked:hover {
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
    color: white;
}

.course-action-btn--unlocked {
    background: linear-gradient(135deg, #00b894, #00a085);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 184, 148, 0.3);
}

.course-action-btn--unlocked:hover {
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.4);
    color: white;
}

.course-action-btn__icon {
    font-size: 16px;
}

.course-action-btn__icon--play {
    font-size: 14px;
    margin-left: 2px;
}
/* ===== END ENHANCED COURSE CARD STYLES ===== */

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 20;
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: var(--shadow-md);
}

.course-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-category {
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.course-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
    flex: 1;
}

.course-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.course-instructor {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.instructor-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.instructor-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.course-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.course-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.course-price .original-price {
    font-size: 1rem;
    color: var(--text-light);
    text-decoration: line-through;
    margin-right: 0.5rem;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.rating-stars {
    color: var(--accent-color);
}

.rating-count {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

/* Learning Dashboard */
.dashboard-container {
    max-width: 1280px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
}

.dashboard-sidebar {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 90px;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-item {
    margin-bottom: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.sidebar-link:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.sidebar-link.active {
    background: var(--primary-color);
    color: white;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.primary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.stat-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
}

.stat-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-color);
}

.stat-content {
    flex: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Video Player Container */
.video-player-container {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-player {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
}

.video-controls {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.video-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.video-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.video-actions {
    display: flex;
    gap: 1rem;
}

.video-action-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.video-action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Course Curriculum */
.curriculum-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-top: 2rem;
}

.curriculum-header {
    margin-bottom: 1.5rem;
}

.curriculum-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.curriculum-list {
    list-style: none;
}

.curriculum-module {
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.module-header {
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition-fast);
}

.module-header:hover {
    background: var(--bg-tertiary);
}

.module-title {
    font-weight: 600;
    color: var(--text-primary);
}

.module-progress {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.module-lessons {
    list-style: none;
    background: var(--bg-primary);
}

.lesson-item {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.lesson-item:hover {
    background: var(--bg-secondary);
}

.lesson-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lesson-checkbox.completed {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    color: white;
}

.lesson-title {
    flex: 1;
    color: var(--text-primary);
}

.lesson-duration {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* PDCA Brand Specific Styles */
.pdca-primary {
    color: var(--primary-color) !important;
}

.pdca-primary-bg {
    background: var(--primary-color) !important;
    color: white !important;
}

.pdca-gradient {
    background: var(--gradient-primary) !important;
    color: white !important;
}

.pdca-secondary {
    color: var(--secondary-color) !important;
}

.pdca-accent {
    color: var(--accent-color) !important;
}

.pdca-success {
    color: var(--success-color) !important;
}

.pdca-error {
    color: var(--error-color) !important;
}

/* Enhanced Button Variants */
.btn-pdca {
    background: var(--gradient-primary);
    color: white;
    border: none;
}

.btn-pdca:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-pdca-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .dashboard-container {
        grid-template-columns: 1fr;
    }
    
    .dashboard-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}