/* 
  MARKIO Academy - Core CSS Design System
  Theme: Modern Premium Digital Business School / SaaS
*/

/* 1. Fonts & Imports */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* 2. Custom CSS Variables */
:root {
  --font-primary: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', var(--font-primary);
  
  /* Color Palette */
  --color-primary-dark: #0D1B3F;
  --color-brand-blue: #1D4280;
  --color-electric-blue: #2563EB;
  --color-electric-hover: #1D4ED8;
  --color-success: #10B981;
  --color-success-bg: #E6F4EA;
  --color-warning: #F59E0B;
  --color-warning-bg: #FEF3C7;
  --color-danger: #EF4444;
  --color-danger-bg: #FEE2E2;
  
  --color-white: #FFFFFF;
  --color-light-bg: #F8FAFC;
  --color-light-gray: #E2E8F0;
  --color-text-gray: #475569;
  --color-text-dark: #0F172A;
  
  /* Layout Constants */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-premium: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease-out;
}

/* 3. Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-light-bg);
  color: var(--color-text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

/* 4. Global Typography & Spacing Utility classes */
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary-dark) 20%, var(--color-electric-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-alt {
  background: linear-gradient(135deg, var(--color-electric-blue) 0%, var(--color-success) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 5. Layout Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* 6. Navigation Bar */
.navbar {
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
  height: 80px;
  display: flex;
  align-items: center;
  transition: var(--transition-smooth);
}

.navbar-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary-dark);
}

.navbar-brand span {
  color: var(--color-electric-blue);
}

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

.navbar-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-gray);
  padding: 0.5rem 0;
  position: relative;
}

.navbar-link:hover, .navbar-link.active {
  color: var(--color-primary-dark);
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-electric-blue);
  transition: var(--transition-fast);
}

.navbar-link:hover::after, .navbar-link.active::after {
  width: 100%;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-primary-dark);
  cursor: pointer;
  padding: 0.5rem;
}

/* 7. Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-electric-blue);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-electric-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(13, 27, 63, 0.2);
}

.btn-secondary:hover {
  background-color: var(--color-brand-blue);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 27, 63, 0.3);
}

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

.btn-outline:hover {
  background-color: var(--color-light-bg);
  border-color: var(--color-text-gray);
  transform: translateY(-2px);
}

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

.btn-success:hover {
  background-color: #0d9488;
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  background-color: #dc2626;
  transform: translateY(-2px);
}

.btn-sm {
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  font-size: 1.05rem;
  padding: 1rem 2rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* 8. Hero Section */
.hero {
  padding: 6rem 0 5rem;
  position: relative;
  background-color: var(--color-white);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: rgba(37, 99, 235, 0.08);
  color: var(--color-electric-blue);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-gray);
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-img-container {
  width: 100%;
  height: 400px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-brand-blue));
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-premium);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-img-container::before {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.4) 0%, transparent 70%);
  top: -50px;
  right: -50px;
}

.hero-stats-overlay {
  position: absolute;
  bottom: 20px;
  left: -20px;
  background-color: var(--color-white);
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  gap: 1.5rem;
  border: 1px solid var(--color-light-gray);
}

.hero-stat-item {
  text-align: center;
}

.hero-stat-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-electric-blue);
  line-height: 1.2;
}

.hero-stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-gray);
}

/* 9. Cards Styling */
.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 4rem;
}

.section-tag {
  color: var(--color-electric-blue);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--color-text-gray);
}

.grid-courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.course-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226, 232, 240, 0.7);
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition-smooth);
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-premium);
  border-color: rgba(37, 99, 235, 0.2);
}

.course-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-primary-dark);
}

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

.course-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  text-transform: capitalize;
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-danger {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge-secondary {
  background-color: var(--color-light-bg);
  color: var(--color-text-gray);
}

.course-card-category {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-electric-blue);
  text-transform: uppercase;
}

.course-card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.course-card-title a:hover {
  color: var(--color-electric-blue);
}

.course-card-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-gray);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.course-card-footer {
  border-top: 1px solid var(--color-light-gray);
  padding-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.course-card-price {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

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

/* 10. Benefits Section */
.bg-dark-blocks {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  padding: 6rem 0;
  position: relative;
}

.bg-dark-blocks .section-title {
  color: var(--color-white);
}

.grid-benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
}

.benefit-card {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  transition: var(--transition-smooth);
}

.benefit-card:hover {
  transform: translateY(-5px);
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(37, 99, 235, 0.3);
}

.benefit-icon-wrapper {
  width: 56px;
  height: 56px;
  background-color: rgba(37, 99, 235, 0.15);
  color: var(--color-electric-blue);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.benefit-card-title {
  color: var(--color-white);
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.benefit-card-desc {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

/* 11. Testimonials Section */
.testimonials-section {
  padding: 6rem 0;
  background-color: var(--color-light-bg);
}

.grid-testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226, 232, 240, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-stars {
  color: var(--color-warning);
  margin-bottom: 1.25rem;
  display: flex;
  gap: 0.2rem;
}

.testimonial-text {
  font-style: italic;
  color: var(--color-text-gray);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  background-color: var(--color-light-gray);
}

.testimonial-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary-dark);
}

.testimonial-role {
  font-size: 0.8rem;
  color: var(--color-text-gray);
}

/* 12. Pricing Section */
.pricing-section {
  padding: 6rem 0;
  background-color: var(--color-white);
}

.grid-pricing {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  background-color: var(--color-light-bg);
  border-radius: var(--radius-xl);
  padding: 3rem;
  border: 1px solid var(--color-light-gray);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.popular {
  background-color: var(--color-white);
  border-color: var(--color-electric-blue);
  box-shadow: var(--shadow-premium);
}

.pricing-card.popular::before {
  content: 'MÁS POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-electric-blue);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 9999px;
  letter-spacing: 0.05em;
}

.pricing-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--color-text-gray);
  margin-bottom: 2rem;
}

.pricing-price-wrapper {
  margin-bottom: 2.5rem;
}

.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--color-text-gray);
  font-weight: 500;
}

.pricing-features {
  list-style: none;
  margin-bottom: 3rem;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text-dark);
  margin-bottom: 1rem;
}

.pricing-feature-item svg {
  color: var(--color-success);
  flex-shrink: 0;
}

/* 13. Page Title Header */
.page-header {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  padding: 5rem 0;
}

.page-header h1 {
  color: var(--color-white);
  font-size: 2.75rem;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.1rem;
  max-width: 600px;
}

/* 14. Course Listing Filters */
.filters-bar {
  background-color: var(--color-white);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-light-gray);
  box-shadow: var(--shadow-sm);
  margin-top: -2.5rem;
  margin-bottom: 4rem;
  z-index: 10;
  position: relative;
}

.filters-form {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 1rem;
  align-items: end;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-gray);
}

.form-control {
  font-family: var(--font-primary);
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-light-gray);
  background-color: var(--color-white);
  transition: var(--transition-fast);
  outline: none;
}

.form-control:focus {
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* 15. Footer */
.footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 5rem 0 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: auto;
}

.grid-footer {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-white);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-logo span {
  color: var(--color-electric-blue);
}

.footer-title {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
}

.footer-link-item {
  margin-bottom: 0.75rem;
}

.footer-link-item a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

/* 16. Authentication Forms */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 1.5rem;
  flex-grow: 1;
}

.auth-card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-light-gray);
  box-shadow: var(--shadow-premium);
  width: 100%;
  max-width: 480px;
  padding: 3rem;
}

.auth-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.auth-header h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.auth-header p {
  color: var(--color-text-gray);
  font-size: 0.95rem;
}

.auth-footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--color-text-gray);
}

.auth-footer a {
  color: var(--color-electric-blue);
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}

/* 17. Course Page Layout */
.course-detail-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 3rem;
  padding: 4rem 0;
}

.syllabus-container {
  margin-top: 3rem;
}

.syllabus-title {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--color-light-gray);
  padding-bottom: 0.75rem;
}

.module-accordion {
  background-color: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
  overflow: hidden;
}

.module-header {
  padding: 1.25rem 1.5rem;
  background-color: var(--color-light-bg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-light-gray);
}

.module-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.module-meta {
  font-size: 0.85rem;
  color: var(--color-text-gray);
}

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

.lesson-item {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-light-gray);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition-fast);
}

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

.lesson-item:hover {
  background-color: rgba(37, 99, 235, 0.02);
}

.lesson-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lesson-info svg {
  color: var(--color-text-gray);
}

.lesson-title-text {
  font-weight: 500;
  font-size: 0.95rem;
}

.lesson-action {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-sticky-card {
  position: sticky;
  top: 110px;
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-light-gray);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
}

.sidebar-price-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.5rem;
}

.sidebar-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

.course-meta-features {
  list-style: none;
  margin-top: 2rem;
  border-top: 1px solid var(--color-light-gray);
  padding-top: 1.5rem;
}

.course-feature-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.course-feature-label {
  color: var(--color-text-gray);
}

.course-feature-value {
  font-weight: 600;
  color: var(--color-text-dark);
}

/* 18. Dashboard & Sidebar Layout */
.dashboard-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 80px);
}

.sidebar-dashboard {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 1.5rem;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-bottom: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-white);
  border: 2px solid var(--color-electric-blue);
}

.sidebar-user-info {
  display: flex;
  flex-direction: column;
}

.sidebar-user-name {
  color: var(--color-white);
  font-weight: 700;
  font-size: 0.95rem;
}

.sidebar-user-role {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-electric-blue);
  font-weight: 700;
  margin-top: 2px;
}

.sidebar-menu-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-menu-item a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.95rem;
}

.sidebar-menu-item a:hover, .sidebar-menu-item.active a {
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--color-white);
}

.sidebar-menu-item.active a {
  background-color: var(--color-electric-blue);
}

.dashboard-content {
  padding: 3rem;
  background-color: var(--color-light-bg);
}

.dashboard-title-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
}

.dashboard-title {
  font-size: 2rem;
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background-color: var(--color-light-gray);
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--color-success);
  border-radius: 9999px;
  transition: width 0.4s ease-out;
}

/* Dashboard Cards Grid */
.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.stat-box {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-light-gray);
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: rgba(37, 99, 235, 0.08);
  color: var(--color-electric-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.stat-content {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-gray);
  font-weight: 500;
}

/* 19. Lesson Page Split Layout */
.lesson-page-container {
  display: grid;
  grid-template-columns: 350px 1fr;
  min-height: calc(100vh - 80px);
}

.lesson-sidebar {
  background-color: var(--color-white);
  border-right: 1px solid var(--color-light-gray);
  overflow-y: auto;
  height: calc(100vh - 80px);
  position: sticky;
  top: 80px;
}

.lesson-sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-light-gray);
}

.lesson-sidebar-course-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.lesson-sidebar-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-gray);
}

.lesson-sidebar-content {
  padding: 1rem 0;
}

.lesson-sidebar-module {
  border-bottom: 1px solid var(--color-light-gray);
}

.lesson-sidebar-module-header {
  padding: 1rem 1.5rem;
  background-color: var(--color-light-bg);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-primary-dark);
}

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

.lesson-sidebar-item a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-gray);
  border-left: 3px solid transparent;
  transition: var(--transition-fast);
}

.lesson-sidebar-item a:hover {
  background-color: rgba(37, 99, 235, 0.03);
  color: var(--color-text-dark);
}

.lesson-sidebar-item.active a {
  background-color: rgba(37, 99, 235, 0.08);
  color: var(--color-electric-blue);
  border-left-color: var(--color-electric-blue);
  font-weight: 600;
}

.lesson-sidebar-item.completed a svg {
  color: var(--color-success);
}

.lesson-main-content {
  padding: 3rem;
  background-color: var(--color-white);
  overflow-y: auto;
}

.video-player-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background-color: var(--color-text-dark);
  margin-bottom: 2rem;
}

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

.lesson-navigation-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-light-gray);
  border-bottom: 1px solid var(--color-light-gray);
  margin-bottom: 2.5rem;
}

.lesson-text-content {
  font-size: 1.05rem;
  color: var(--color-text-dark);
  margin-bottom: 3rem;
}

.lesson-text-content p {
  margin-bottom: 1.5rem;
}

.lesson-text-content h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.lesson-resources-card {
  background-color: var(--color-light-bg);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.lesson-resources-title {
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.resource-download-list {
  list-style: none;
}

.resource-download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
}

.resource-download-item:last-child {
  margin-bottom: 0;
}

/* 20. Admin Tables & Layout */
.admin-table-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-light-gray);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 2rem;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.admin-table th {
  background-color: var(--color-light-bg);
  color: var(--color-text-gray);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-light-gray);
}

.admin-table td {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-light-gray);
  font-size: 0.95rem;
  color: var(--color-text-dark);
}

.admin-table tr:last-child td {
  border-bottom: none;
}

.admin-table tbody tr:hover {
  background-color: rgba(226, 232, 240, 0.2);
}

.admin-action-btns {
  display: flex;
  gap: 0.5rem;
}

/* Checkout simulated page */
.checkout-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  padding: 4rem 0;
}

.summary-card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-light-gray);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

/* 21. Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-img-container {
    height: 320px;
  }
  
  .course-detail-grid {
    grid-template-columns: 1fr;
  }
  
  .checkout-grid {
    grid-template-columns: 1fr;
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .sidebar-dashboard {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .lesson-page-container {
    grid-template-columns: 1fr;
  }
  
  .lesson-sidebar {
    height: auto;
    max-height: 300px;
    position: relative;
    top: 0;
    border-right: none;
    border-bottom: 1px solid var(--color-light-gray);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .navbar-menu {
    display: none; /* Hide default nav for mobile */
  }
  
  .mobile-nav-toggle {
    display: block;
  }
  
  .filters-form {
    grid-template-columns: 1fr;
  }
  
  .grid-footer {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}