:root {
  /* Color scheme */
  --primary-color: #3a86ff;
  --primary-light: #61a5ff;
  --primary-dark: #2563eb;
  --secondary-color: #4cc9f0;
  --secondary-light: #70d7f7;
  --secondary-dark: #38b6db;
  --accent-color: #8338ec;
  --accent-light: #9b5cf6;
  --accent-dark: #6d28d9;
  
  /* Neutral colors */
  --white: #ffffff;
  --off-white: #f8f9fa;
  --light-gray: #e9ecef;
  --gray: #adb5bd;
  --dark-gray: #495057;
  --black: #212529;
  
  /* Text colors */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-light: #f8f9fa;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-xxl: 3rem;
  
  /* Fonts */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px 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);
  
  /* Animations */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Container widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  line-height: 1.6;
  background-color: var(--white);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--space-md);
}

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

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

img {
  max-width: 100%;
  height: auto;
}

ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

/* Section styling */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xxl);
}

.section-header h2 {
  position: relative;
  display: inline-block;
  margin-bottom: var(--space-md);
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  width: 50px;
  height: 3px;
  background: var(--primary-color);
  transform: translateX(-50%);
  border-radius: var(--radius-full);
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1rem;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

button, input[type='submit'] {
  cursor: pointer;
  font-family: var(--font-heading);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: background-color var(--transition-normal);
  backdrop-filter: blur(10px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.logo h1 {
  font-size: 1.5rem;
  margin-bottom: 0;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
}

.desktop-nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.desktop-nav ul li {
  margin-left: var(--space-lg);
}

.desktop-nav ul li a {
  color: var(--text-primary);
  font-weight: 500;
  transition: color var(--transition-normal);
  position: relative;
}

.desktop-nav ul li a:hover {
  color: var(--primary-color);
  text-decoration: none;
}

.desktop-nav ul li a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
}

.desktop-nav ul li a:hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--white);
  box-shadow: var(--shadow-md);
  padding: var(--space-md) 0;
  transform: translateY(-10px);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav ul li {
  margin: var(--space-sm) 0;
}

.mobile-nav ul li a {
  display: block;
  padding: var(--space-sm) var(--space-xl);
  color: var(--text-primary);
  font-weight: 500;
  transition: all var(--transition-normal);
}

.mobile-nav ul li a:hover {
  background-color: var(--light-gray);
  color: var(--primary-color);
  text-decoration: none;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Hero section */
.hero {
  position: relative;
  padding: calc(80px + var(--space-xxl)) 0 var(--space-xxl);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-content h1 {
  font-size: 3rem;
  color: var(--white);
  margin-bottom: var(--space-sm);
  animation: fadeInUp 1s ease-out;
}

.hero-content h2 {
  font-size: 1.8rem;
  color: var(--white);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-content p {
  font-size: 1.2rem;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  animation: fadeInUp 1s ease-out 0.6s both;
}

/* Services section */
.services {
  padding: var(--space-xxl) 0;
  background-color: var(--white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.service-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 250px;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.service-card:hover .card-image img {
  transform: scale(1.05);
}

.card-content {
  padding: var(--space-lg);
  text-align: center;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-content h3 {
  color: var(--text-primary);
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.card-content p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

/* Methodology section */
.methodology {
  padding: var(--space-xxl) 0;
  background-color: var(--off-white);
}

.methodology-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.methodology-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.methodology-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.methodology-content:hover .methodology-image img {
  transform: scale(1.03);
}

.methodology-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.step {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.step-number {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  color: var(--white);
  font-weight: bold;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.step-content h3 {
  margin-bottom: var(--space-sm);
}

/* Statistics section */
.statistics {
  padding: var(--space-xxl) 0;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
  color: var(--white);
}

.statistics .section-header h2,
.statistics .section-header p {
  color: var(--white);
}

.statistics .section-header h2::after {
  background-color: var(--white);
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
}

.stat-card {
  background-color: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.stat-card:hover {
  transform: translateY(-10px);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  display: inline-block;
}

.stat-symbol {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  display: inline-block;
  margin-left: 5px;
}

.stat-card p {
  margin-top: var(--space-md);
  font-size: 1rem;
}

/* Resources section */
.resources {
  padding: var(--space-xxl) 0;
  background-color: var(--white);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.resource-card {
  background-color: var(--off-white);
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.resource-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.resource-card h3 {
  color: var(--primary-dark);
  margin-bottom: var(--space-md);
  font-size: 1.3rem;
}

.resource-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.resource-link {
  display: inline-flex;
  align-items: center;
  color: var(--primary-color);
  font-weight: 600;
  transition: color var(--transition-normal);
}

.resource-link:hover {
  color: var(--primary-dark);
  text-decoration: none;
}

.resource-link .arrow {
  margin-left: var(--space-sm);
  transition: transform var(--transition-normal);
}

.resource-link:hover .arrow {
  transform: translateX(5px);
}

/* Instructors section */
.instructors {
  padding: var(--space-xxl) 0;
  background-color: var(--off-white);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.instructor-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.instructor-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.instructor-card .card-image {
  width: 100%;
  height: 300px;
}

.instructor-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.instructor-title {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.social-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.social-link {
  color: var(--primary-color);
  font-weight: 500;
  transition: color var(--transition-normal);
}

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

/* Team section */
.team {
  padding: var(--space-xxl) 0;
  background-color: var(--white);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
}

.team-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--off-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.team-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.team-card .card-image {
  width: 100%;
  height: 250px;
}

.team-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  margin: var(--space-md);
}

.team-title {
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

/* Sustainability section */
.sustainability {
  padding: var(--space-xxl) 0;
  background-color: var(--off-white);
}

.sustainability-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.sustainability-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.sustainability-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.sustainability-content:hover .sustainability-image img {
  transform: scale(1.03);
}

.sustainability-text h3 {
  color: var(--primary-dark);
  margin-bottom: var(--space-md);
}

.sustainability-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.pillar {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
  padding: var(--space-md);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--white);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
}

.pillar:hover {
  transform: translateY(-5px);
}

.pillar h4 {
  color: var(--white);
  margin-bottom: var(--space-sm);
}

.pillar p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Contact section */
.contact {
  padding: var(--space-xxl) 0;
  background-color: var(--white);
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.contact-info {
  padding: var(--space-xl);
  background-color: var(--off-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.contact-info h3 {
  color: var(--primary-dark);
  margin-bottom: var(--space-lg);
}

.contact-details {
  margin-top: var(--space-lg);
}

.contact-item {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-md);
}

.contact-icon {
  width: 40px;
  height: 40px;
  margin-right: var(--space-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

.contact-icon img {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

.contact-form-container {
  padding: var(--space-xl);
  background-color: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.contact-form-container h3 {
  color: var(--primary-dark);
  margin-bottom: var(--space-lg);
}

.contact-form {
  display: grid;
  gap: var(--space-md);
}

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

.form-group label {
  margin-bottom: var(--space-xs);
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  padding: var(--space-md);
  border: 1px solid var(--light-gray);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.submit-btn {
  margin-top: var(--space-md);
}

/* Footer */
.footer {
  background-color: var(--dark-gray);
  color: var(--white);
  padding-top: var(--space-xxl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo h2 {
  color: var(--white);
  margin-bottom: var(--space-md);
  font-size: 1.8rem;
}

.footer-logo p {
  color: var(--gray);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.footer-links-column h3 {
  color: var(--white);
  margin-bottom: var(--space-lg);
  font-size: 1.2rem;
}

.footer-links-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links-column ul li {
  margin-bottom: var(--space-md);
}

.footer-links-column ul li a {
  color: var(--gray);
  transition: color var(--transition-normal);
  position: relative;
  display: inline-block;
}

.footer-links-column ul li a:hover {
  color: var(--white);
  text-decoration: none;
}

.footer-links-column ul li a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -3px;
  left: 0;
  background-color: var(--white);
  transition: width var(--transition-normal);
}

.footer-links-column ul li a:hover::after {
  width: 100%;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.social-links li {
  margin-bottom: var(--space-sm) !important;
}

.social-links a {
  color: var(--gray);
  font-weight: 500;
  transition: color var(--transition-normal);
  position: relative;
  display: inline-block;
}

.social-links a:hover {
  color: var(--white);
  text-decoration: none;
}

.footer-bottom {
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer-bottom p {
  color: var(--gray);
  margin-bottom: 0;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  justify-content: center;
  align-items: center;
  z-index: 2000;
}

.modal-content {
  background-color: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius-md);
  max-width: 500px;
  width: 90%;
  text-align: center;
  position: relative;
  animation: modalFadeIn 0.3s ease-out;
}

.close-modal {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition-normal);
}

.close-modal:hover {
  color: var(--text-primary);
}

.success-icon {
  margin: 0 auto var(--space-lg);
  width: 80px;
  height: 80px;
}

.modal-close-btn {
  margin-top: var(--space-lg);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Additional pages styles */
.privacy-page, .terms-page {
  padding-top: 100px;
}

.success-page {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

/* Responsive styles */
@media (max-width: 992px) {
  .methodology-content,
  .sustainability-content {
    grid-template-columns: 1fr;
  }
  
  .contact-container {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .sustainability-pillars {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-nav {
    display: block;
  }
  
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-content h2 {
    font-size: 1.5rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 576px) {
  .section-header h2 {
    font-size: 1.8rem;
  }
  
  .step {
    flex-direction: column;
  }
  
  .step-number {
    margin-bottom: var(--space-sm);
  }
}