:root {
  --primary-color: #8b5cf6;
  --secondary-color: #f59e0b;
  --accent-color: #ec4899;
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-muted: #737373;
  --border-color: #333333;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --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);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.cta-button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.95rem;
  white-space: nowrap;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  gap: 4px;
  padding: 8px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) 0;
  background: radial-gradient(ellipse at center, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
}

.hero-button {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.hero-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

.video-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

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

.expert-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-lg);
  backdrop-filter: blur(10px);
}

.badge-icon {
  font-size: 1.5rem;
}

.badge-text strong {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
}

.badge-text span {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Course Preview Section */
.course-preview {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.course-panel {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.course-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.course-duration {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.progress-circle {
  position: relative;
  width: 60px;
  height: 60px;
}

.progress-circle svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-bg {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 2;
}

.progress-fill {
  fill: none;
  stroke: url(#gradient);
  stroke-width: 2;
  stroke-dasharray: 100, 100;
  stroke-dashoffset: 0;
  stroke-linecap: round;
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-weight: 600;
  font-size: 0.9rem;
}

.progress-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-left: var(--spacing-sm);
}

.course-chapters {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.chapter {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.chapter:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.chapter-icon {
  font-size: 1.5rem;
  width: 40px;
  text-align: center;
  flex-shrink: 0;
}

.chapter-content {
  flex: 1;
}

.chapter-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.chapter-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.chapter-status {
  color: var(--success-color);
  font-size: 1.2rem;
  font-weight: bold;
  flex-shrink: 0;
}

/* Testimonials Section */
.testimonials {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-3xl);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.testimonial-carousel {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.testimonial {
  display: none;
  text-align: center;
  padding: var(--spacing-xl);
}

.testimonial.active {
  display: block;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.testimonial-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.stars {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
}

.testimonial-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.author-info strong {
  display: block;
  font-weight: 600;
}

.author-info span {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  background: var(--border-color);
  cursor: pointer;
  transition: all 0.3s ease;
}

.dot.active {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  transform: scale(1.2);
}

/* Pricing Section */
.pricing {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.pricing-card {
  max-width: 500px;
  margin: 0 auto;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.pricing-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.pricing-header {
  margin-bottom: var(--spacing-xl);
}

.pricing-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.pricing-price {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.price-amount {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.price-period {
  color: var(--text-secondary);
  font-size: 1rem;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-align: left;
}

.feature-icon {
  color: var(--success-color);
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.pricing-button {
  width: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.pricing-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* FAQ Section */
.faq {
  padding: var(--spacing-3xl) 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: var(--primary-color);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all 0.3s ease;
}

.faq-question:hover {
  color: var(--primary-color);
}

.faq-icon {
  font-size: 1.5rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

.faq-answer p {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Contact Section */
.contact {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.contact-info h2 {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.contact-info p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xl);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.contact-method:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-color);
}

.method-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.method-info strong {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.method-info span {
  color: var(--text-secondary);
}

.contact-form {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.contact-form h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-submit {
  width: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-bottom: var(--spacing-md);
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.form-privacy {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

/* Footer */
.footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
  max-width: 300px;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    text-align: center;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .nav {
    padding: var(--spacing-md);
  }

  .nav-menu {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }

  .cta-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }
  
  .hero {
    padding: calc(var(--spacing-3xl) + 60px) 0 var(--spacing-2xl);
    min-height: auto;
  }

  .hero-content {
    padding: 0 var(--spacing-md);
    gap: var(--spacing-xl);
  }
  
  .hero-title {
    font-size: 2.2rem;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
  }
  
  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
    max-width: none;
  }

  .hero-button {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
  }

  .expert-badge {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }

  .badge-text {
    text-align: center;
  }
  
  .course-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
    text-align: left;
  }

  .course-title {
    font-size: 1.5rem;
  }

  .course-duration {
    font-size: 1rem;
  }

  .progress-circle {
    align-self: center;
  }
  
  .chapter {
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }

  .chapter-icon {
    width: 30px;
    font-size: 1.2rem;
  }

  .chapter-content h3 {
    font-size: 1rem;
  }

  .chapter-content p {
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-2xl);
  }

  .testimonial {
    padding: var(--spacing-md);
  }

  .testimonial-content {
    padding: var(--spacing-lg);
  }

  .testimonial-content p {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
  }

  .testimonial-author {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .author-avatar {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .pricing-card {
    margin: 0 var(--spacing-md);
  }

  .price-amount {
    font-size: 2.5rem;
  }

  .faq-question {
    padding: var(--spacing-md);
    font-size: 1rem;
  }

  .faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    font-size: 0.95rem;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .nav {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .logo {
    font-size: 1.3rem;
  }

  .cta-button {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
  }

  .hero {
    padding: calc(var(--spacing-2xl) + 60px) 0 var(--spacing-xl);
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 1.8rem;
  }
  
  .course-panel,
  .contact-form,
  .pricing-card {
    padding: var(--spacing-lg);
    margin: 0 var(--spacing-sm);
  }
  
  .testimonial-content {
    padding: var(--spacing-md);
  }

  .price-amount {
    font-size: 2.2rem;
  }

  .pricing-title {
    font-size: 1.3rem;
  }

  .contact-form h3 {
    font-size: 1.3rem;
  }
}

/* Mobile menu styles */
@media (max-width: 768px) {
  .nav-menu.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    gap: var(--spacing-lg);
  }

  .nav-menu.mobile-open .nav-link {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-menu.mobile-open .nav-link:last-child {
    border-bottom: none;
  }
}