/* Global AI University - Marketing Landing Page Styles */
:root {
  --primary-color: #4361ee;
  --secondary-color: #3f37c9;
  --accent-color: #4cc9f0;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --success-color: #4ade80;
  --warning-color: #facc15;
  --danger-color: #f87171;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--light-color);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Navigation */
.header {
  background-color: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-link {
  text-decoration: none;
  color: var(--gray-700);
  font-weight: 500;
  transition: color 0.3s ease;
}

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

.cta-button {
  background-color: var(--primary-color);
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.3s ease;
  display: inline-block;
}

.cta-button:hover {
  background-color: var(--secondary-color);
  color: white;
}

/* Hero Section */
.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--accent-color), var(--primary-color));
  opacity: 0.1;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--gray-900);
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  color: var(--gray-600);
  margin-bottom: 30px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 30px;
}

.primary-cta {
  background-color: var(--primary-color);
  color: white;
  padding: 15px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.primary-cta:hover {
  background-color: var(--secondary-color);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
  color: white;
}

.secondary-cta {
  background-color: transparent;
  color: var(--primary-color);
  padding: 15px 30px;
  border: 2px solid var(--primary-color);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
}

.secondary-cta:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

/* Social Proof Section */
.social-proof {
  padding: 60px 0;
  background-color: white;
  text-align: center;
}

.social-proof h2 {
  font-size: 2rem;
  margin-bottom: 40px;
  color: var(--gray-900);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  max-width: 900px;
  margin: 0 auto;
}

.stat-card {
  padding: 20px;
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.stat-label {
  font-size: 1rem;
  color: var(--gray-600);
}

/* Course Preview Section */
.course-preview {
  padding: 80px 0;
  background-color: var(--gray-50);
}

.course-preview h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--gray-900);
}

.course-preview p {
  text-align: center;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto 50px;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.course-card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.course-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.9rem;
}

.course-content {
  padding: 25px;
}

.course-title {
  font-size: 1.4rem;
  margin-bottom: 10px;
  color: var(--gray-900);
}

.course-description {
  color: var(--gray-600);
  margin-bottom: 15px;
  font-size: 0.95rem;
}

.course-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 15px;
}

.course-duration, .course-level {
  font-size: 0.9rem;
  color: var(--gray-500);
}

.course-price {
  font-weight: 700;
  color: var(--primary-color);
  font-size: 1.2rem;
}

/* Testimonials Section */
.testimonials {
  padding: 80px 0;
  background-color: white;
}

.testimonials h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 50px;
  color: var(--gray-900);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.testimonial-card {
  background: var(--gray-50);
  border-radius: 10px;
  padding: 30px;
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 20px;
  left: 20px;
  font-size: 4rem;
  color: var(--accent-color);
  opacity: 0.2;
  font-family: serif;
  line-height: 1;
}

.testimonial-content {
  margin-top: 20px;
  color: var(--gray-700);
  font-style: italic;
  position: relative;
  z-index: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  margin-top: 20px;
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--gray-300);
  margin-right: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.8rem;
}

.author-info h4 {
  margin-bottom: 5px;
  color: var(--gray-900);
}

.author-info p {
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* Pricing Section */
.pricing {
  padding: 80px 0;
  background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
}

.pricing h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--gray-900);
}

.pricing p {
  text-align: center;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto 50px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.pricing-card {
  background: white;
  border-radius: 10px;
  padding: 40px 30px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s ease;
  position: relative;
  overflow: hidden;
}

.pricing-card.popular::before {
  content: 'MOST POPULAR';
  position: absolute;
  top: 15px;
  right: -30px;
  background: var(--success-color);
  color: white;
  padding: 5px 30px;
  font-size: 0.8rem;
  font-weight: 600;
  transform: rotate(45deg);
}

.pricing-card:hover {
  transform: scale(1.03);
}

.plan-name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--gray-900);
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.plan-price span {
  font-size: 1rem;
  color: var(--gray-500);
  font-weight: normal;
}

.plan-features {
  list-style: none;
  margin-bottom: 30px;
  text-align: left;
}

.plan-features li {
  padding: 8px 0;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
}

.plan-features li:last-child {
  border-bottom: none;
}

.plan-features li::before {
  content: '✓';
  color: var(--success-color);
  font-weight: bold;
  margin-right: 10px;
}

.pricing-cta {
  width: 100%;
  padding: 15px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  display: block;
  transition: all 0.3s ease;
}

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

.pricing-cta.primary:hover {
  background-color: var(--secondary-color);
}

.pricing-cta.secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.pricing-cta.secondary:hover {
  background-color: var(--primary-color);
  color: white;
}

/* Footer */
.footer {
  background-color: var(--gray-900);
  color: white;
  padding: 60px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto 40px;
}

.footer-column h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--gray-300);
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--gray-800);
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--gray-700);
}

.form-input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--gray-300);
  border-radius: 5px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-submit {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 15px 30px;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease;
  width: 100%;
}

.form-submit:hover {
  background-color: var(--secondary-color);
}

/* Trust Badges */
.trust-badges {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 40px 0;
  flex-wrap: wrap;
}

.trust-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.trust-icon {
  width: 60px;
  height: 60px;
  background-color: var(--gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  font-size: 1.5rem;
  color: var(--primary-color);
}

.trust-text {
  font-size: 0.9rem;
  color: var(--gray-600);
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .nav-links {
    display: none;
  }

  .navbar {
    flex-direction: column;
    gap: 15px;
  }

  .stats-grid, .courses-grid, .testimonials-grid, .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}