:root {
  --primary: #4361ee;
  --primary-dark: #3a56d4;
  --primary-light: #ebefff;
  --secondary: #f72585;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f9fafb;
  --border: #e5e7eb;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --transition: all 0.2s ease;
  --max-width: 1200px;
}

* {
  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;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-light);
  font-size: 1.125rem;
}

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

a:hover {
  color: var(--primary-dark);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
}

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

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

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

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 100;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
  height: 70px;
  display: flex;
  align-items: center;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
}

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

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  font-weight: 500;
  color: var(--text);
}

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

.nav-buttons {
  display: flex;
  gap: 1rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 6rem 0 6rem;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: linear-gradient(45deg, rgba(67, 97, 238, 0.05) 0%, rgba(247, 37, 133, 0.05) 100%);
  border-radius: 50%;
  z-index: 0;
}

.hero-content {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.hero-description {
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 6rem;
}

/* Logos */
.logos {
  padding: 4rem 0;
}

.logos-title {
  text-align: center;
  margin-bottom: 3rem;
}

.logo-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.logo-item {
  width: 120px;
  height: 60px;
  background-color: var(--bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

/* Testimonial */
.testimonial-card {
  background-color: var(--bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 2.5rem;
  margin: 4rem auto;
  max-width: 900px;
}

.testimonial-content {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 2rem;
  position: relative;
}

.testimonial-content::before {
  content: """;
  position: absolute;
  top: -20px;
  left: -10px;
  font-size: 5rem;
  color: var(--primary-light);
  opacity: 0.8;
  z-index: -1;
}

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

.author-image {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  overflow: hidden;
  background-color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.author-info h4 {
  margin-bottom: 0.25rem;
}

.author-info p {
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-light);
}

/* Feature Section */
.section {
  padding: 8rem 0;
}

.section:nth-child(even) {
  background-color: var(--bg-alt);
}

.section-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.section-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  aspect-ratio: 4/3;
  background-color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.section-image::after {
  content: "";
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  bottom: 10px;
  border: 2px dashed var(--primary-light);
  border-radius: calc(var(--radius-lg) - 10px);
  z-index: 0;
}

.section-content-full {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

/* Academic Sections */
.academic-sections {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 1rem;
  cursor: pointer;
  margin-top: 2rem;
}

.academic-section {
  background-color: var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 1.5rem 1rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.academic-section:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.academic-section-icon {
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

/* Research Info */
.research-info {
  background-color: var(--primary-light);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2.5rem;
}

.research-info p {
  font-style: italic;
  color: var(--text);
  margin-bottom: 1rem;
}

.research-info cite {
  display: block;
  font-size: 0.875rem;
  color: var(--text-light);
  margin-top: 0.5rem;
}

/* Testimonials Grid */
.testimonials {
  padding: 8rem 0;
}

.testimonials-header {
  text-align: center;
  margin-bottom: 4rem;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.testimonial-item {
  background-color: var(--bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  transition: var(--transition);
}

.testimonial-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
}

.testimonial-item-content {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

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

.testimonial-item-author-image {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-weight: 700;
}

.testimonial-item-author-info h4 {
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.testimonial-item-author-info p {
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
  color: var(--text-light);
}

.show-more {
  display: block;
  margin: 3rem auto 0;
  text-align: center;
}

/* How it works */
.how-it-works {
  padding: 8rem 0;
  background-color: var(--bg-alt);
}

.steps {
  max-width: 700px;
  margin: 4rem auto 0;
}

.step {
  display: flex;
  gap: 2rem;
  margin-bottom: 4rem;
}

.step:last-child {
  margin-bottom: 0;
}

.step-number {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
}

.step-content h3 {
  margin-bottom: 0.5rem;
}

.join-cta {
  text-align: center;
  margin-top: 6rem;
}

.join-cta h3 {
  margin-bottom: 1.5rem;
}

/* Features */
.features {
  padding: 8rem 0;
}

.features-header {
  text-align: center;
  margin-bottom: 4rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-item {
  background-color: var(--bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  transition: var(--transition);
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

/* Footer */
.footer {
  background-color: var(--bg-alt);
  padding: 6rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.footer-description {
  font-size: 0.875rem;
  color: var(--text-light);
}

.footer-heading {
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

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

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

.footer-link a {
  font-size: 0.875rem;
  color: var(--text-light);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

.footer-social {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.footer-social a {
  color: var(--text-light);
  font-size: 1.25rem;
  transition: var(--transition);
}

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

/* Responsive */
@media (max-width: 992px) {
  .section-container {
	grid-template-columns: 1fr;
	gap: 3rem;
  }
  
  .section-container.reverse {
	display: flex;
	flex-direction: column-reverse;
  }
  
  .footer-grid {
	grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-buttons {
	display: none;
  }
  
  .mobile-menu-btn {
	display: block;
  }
  
  .hero-buttons {
	flex-direction: column;
  }
  
  .footer-grid {
	grid-template-columns: 1fr;
	gap: 3rem;
  }
}

/* Mobile Menu Toggle Button - already defined but let's enhance it */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
  z-index: 101; /* Ensure it stays above the mobile menu */
  padding: 0.5rem;
}

/* Mobile Navigation Styles */
@media (max-width: 768px) {
  .header-container {
    position: relative;
  }

  .nav {
    width: 100%;
    justify-content: flex-end;
  }

  .mobile-menu-btn {
    display: block;
  }

  /* Nav links hidden by default on mobile */
  .nav-links, 
  .nav-buttons {
    display: none;
    position: absolute;
    top: 55px; /* Height of the header */
    left: 0;
    width: 100%;
    background-color: var(--bg);
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    z-index: 100;
  }

  /* When active class is applied, show mobile menu */
  .nav-links.active,
  .nav-buttons.active {
    display: flex;
  }

  /* Style the links in mobile view */
  .nav-links a {
    width: 100%;
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  /* Style the buttons in mobile view */
  .nav-buttons {
    border-top: 1px solid var(--border);
    margin-top: 0;
    padding-top: 1rem;
  }

  .nav-buttons a {
    width: 100%;
    margin: 0.5rem 0;
    text-align: center;
  }
}