:root {
  /* Tetrad color scheme */
  --primary: #3a7bd5;
  --primary-dark: #2c60b0;
  --primary-light: #6a9ae6;
  --secondary: #d53a7b;
  --secondary-dark: #b02c60;
  --secondary-light: #e66a9a;
  --accent1: #7bd53a;
  --accent1-dark: #60b02c;
  --accent1-light: #9ae66a;
  --accent2: #d57b3a;
  --accent2-dark: #b0602c;
  --accent2-light: #e69a6a;

  /* Neutral colors */
  --white: #ffffff;
  --light: #f8f9fa;
  --light-gray: #e9ecef;
  --gray: #adb5bd;
  --dark-gray: #495057;
  --dark: #212529;
  --black: #000000;

  /* Typography */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  
  /* Shadows for Neumorphism */
  --nm-shadow-small: 5px 5px 10px rgba(0, 0, 0, 0.1), -5px -5px 10px rgba(255, 255, 255, 0.8);
  --nm-shadow: 10px 10px 20px rgba(0, 0, 0, 0.1), -10px -10px 20px rgba(255, 255, 255, 0.8);
  --nm-shadow-large: 15px 15px 30px rgba(0, 0, 0, 0.1), -15px -15px 30px rgba(255, 255, 255, 0.8);
  --nm-shadow-inset: inset 5px 5px 10px rgba(0, 0, 0, 0.1), inset -5px -5px 10px rgba(255, 255, 255, 0.8);
  
  /* Border radius */
  --radius-small: 8px;
  --radius: 12px;
  --radius-large: 20px;
  --radius-full: 50%;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 5rem;
  
  /* Layout */
  --container-width: 1200px;
  --header-height: 80px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--light);
  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(--dark);
}

h1 {
  font-size: 3.5rem;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.25rem;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

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

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

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

.section-title {
  text-align: center;
  margin-bottom: var(--space-lg);
  position: relative;
  color: var(--dark);
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--secondary));
  margin: var(--space-sm) auto 0;
  border-radius: var(--radius-small);
}

.section-subtitle {
  text-align: center;
  color: var(--dark-gray);
  font-size: 1.2rem;
  margin-bottom: var(--space-xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn, 
button,
input[type="submit"] {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  transition: all 0.3s ease;
  box-shadow: var(--nm-shadow-small);
  background-color: var(--light);
  color: var(--dark);
}

.btn:hover, 
button:hover,
input[type="submit"]:hover {
  transform: translateY(-3px);
  box-shadow: var(--nm-shadow);
}

.btn:active, 
button:active,
input[type="submit"]:active {
  transform: translateY(1px);
  box-shadow: var(--nm-shadow-inset);
}

.btn.primary, 
button.primary,
input[type="submit"].primary {
  background-color: var(--primary);
  color: var(--white);
}

.btn.primary:hover, 
button.primary:hover,
input[type="submit"].primary:hover {
  background-color: var(--primary-dark);
}

.btn.secondary, 
button.secondary,
input[type="submit"].secondary {
  background-color: var(--secondary);
  color: var(--white);
}

.btn.secondary:hover, 
button.secondary:hover,
input[type="submit"].secondary:hover {
  background-color: var(--secondary-dark);
}

.btn-link {
  display: inline-block;
  color: var(--primary);
  font-weight: 600;
  padding: var(--space-sm) 0;
  position: relative;
  transition: color 0.3s ease;
}

.btn-link::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--primary);
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform 0.3s ease;
}

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

.btn-link:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

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

.logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo h1 {
  font-size: 1.75rem;
  color: var(--primary);
  margin: 0;
}

.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 {
  font-weight: 500;
  color: var(--dark);
  transition: color 0.3s ease;
  position: relative;
}

.desktop-nav ul li a::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--primary);
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform 0.3s ease;
}

.desktop-nav ul li a:hover {
  color: var(--primary);
}

.desktop-nav ul li a:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

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

.mobile-menu-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--dark);
  border-radius: 3px;
  transition: all 0.3s ease;
}

.mobile-nav {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background-color: var(--white);
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  padding: var(--space-md) 0;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
}

.mobile-nav.active {
  transform: translateY(0);
  display: block;
}

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

.mobile-nav ul li {
  padding: var(--space-sm) var(--space-lg);
}

.mobile-nav ul li a {
  display: block;
  color: var(--dark);
  font-weight: 500;
  padding: var(--space-sm) 0;
}

/* Hero Section */
.hero {
  position: relative;
  padding: calc(var(--header-height) + var(--space-xxl)) 0 var(--space-xxl);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--white);
  text-align: center;
}

.hero .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.7));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-xxl) 0;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: var(--space-lg);
  color: var(--white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
  font-size: 1.5rem;
  margin-bottom: var(--space-xl);
  color: var(--white);
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

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

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

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--white);
  box-shadow: var(--nm-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.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 0.5s ease;
}

.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;
}

.card-content h3 {
  color: var(--dark);
  margin-bottom: var(--space-md);
}

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

/* Vision Section */
.vision {
  padding: var(--space-xxl) 0;
  background-color: var(--light-gray);
}

.vision-content {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.vision-text {
  flex: 1;
}

.vision-text h2 {
  color: var(--dark);
  margin-bottom: var(--space-lg);
}

.vision-text p {
  color: var(--dark-gray);
  margin-bottom: var(--space-md);
}

.vision-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--nm-shadow);
}

.vision-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

/* Case Studies Section */
.case-studies {
  padding: var(--space-xxl) 0;
  background-color: var(--white);
}

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

/* Research Section */
.research {
  padding: var(--space-xxl) 0;
  background-color: var(--light);
}

.research-content {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.research-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--nm-shadow);
}

.research-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.research-text {
  flex: 1;
}

.research-text h3 {
  color: var(--dark);
  margin-bottom: var(--space-lg);
}

.research-text p {
  color: var(--dark-gray);
  margin-bottom: var(--space-md);
}

.research-list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-lg);
}

.research-list li {
  display: flex;
  justify-content: space-between;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--light-gray);
}

.research-list li:last-child {
  border-bottom: none;
}

/* Resources Section */
.resources {
  padding: var(--space-xxl) 0;
  background-color: var(--light-gray);
}

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

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

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

/* Gallery Section */
.gallery {
  padding: var(--space-xxl) 0;
  background-color: var(--light);
}

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

.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--nm-shadow);
  transition: transform 0.3s ease;
}

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

.gallery-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--space-md);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  color: var(--white);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-caption {
  opacity: 1;
}

/* Contact Section */
.contact {
  padding: var(--space-xxl) 0;
  background-color: var(--light-gray);
}

.contact-content {
  display: flex;
  gap: var(--space-xl);
}

.contact-info, .contact-form {
  flex: 1;
}

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

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

.contact-item {
  display: flex;
  margin-bottom: var(--space-lg);
}

.contact-item .icon {
  font-size: 1.5rem;
  margin-right: var(--space-md);
  color: var(--primary);
}

.contact-item h4 {
  margin-bottom: var(--space-xs);
  color: var(--dark);
}

.contact-item p {
  color: var(--dark-gray);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--dark);
  font-weight: 500;
}

.form-group input, 
.form-group select, 
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid var(--light-gray);
  border-radius: var(--radius);
  background-color: var(--white);
  transition: all 0.3s ease;
  font-family: var(--font-body);
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(58, 123, 213, 0.1);
}

/* Footer */
.footer {
  background-color: var(--dark);
  color: var(--light);
  padding: var(--space-xxl) 0 var(--space-lg);
}

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

.footer-about h3, 
.footer-links h3, 
.footer-social h3, 
.footer-subscribe h3 {
  color: var(--white);
  margin-bottom: var(--space-md);
}

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

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

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

.footer-links ul li a {
  color: var(--gray);
  transition: color 0.3s ease;
}

.footer-links ul li a:hover {
  color: var(--white);
}

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

.social-links a {
  color: var(--gray);
  transition: color 0.3s ease;
}

.social-links a:hover {
  color: var(--white);
}

.footer-subscribe p {
  color: var(--gray);
  margin-bottom: var(--space-md);
}

.footer-subscribe form {
  display: flex;
  gap: var(--space-sm);
}

.footer-subscribe input {
  flex: 1;
  padding: var(--space-md);
  border: none;
  border-radius: var(--radius);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
  transition: background-color 0.3s ease;
}

.footer-subscribe input::placeholder {
  color: var(--gray);
}

.footer-subscribe input:focus {
  outline: none;
  background-color: rgba(255, 255, 255, 0.2);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

/* Modal Windows */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius);
  box-shadow: var(--nm-shadow-large);
  max-width: 500px;
  width: 100%;
  position: relative;
  animation: modalFadeIn 0.3s ease forwards;
}

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

.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--dark-gray);
  transition: color 0.3s ease;
}

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

/* Success Page */
.success-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background-color: var(--light);
  text-align: center;
  padding: var(--space-lg);
}

.success-content {
  max-width: 600px;
  background-color: var(--white);
  padding: var(--space-xl);
  border-radius: var(--radius);
  box-shadow: var(--nm-shadow);
}

.success-content h1 {
  color: var(--primary);
  margin-bottom: var(--space-lg);
}

.success-content p {
  margin-bottom: var(--space-lg);
  color: var(--dark-gray);
}

/* Privacy & Terms Pages */
.page-content {
  padding: calc(var(--header-height) + var(--space-xl)) 0 var(--space-xxl);
  background-color: var(--white);
}

.page-content .container {
  max-width: 800px;
}

.page-content h1 {
  margin-bottom: var(--space-xl);
  color: var(--dark);
}

.page-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--dark);
}

.page-content p {
  margin-bottom: var(--space-md);
  color: var(--dark-gray);
}

.page-content ul {
  margin-bottom: var(--space-lg);
}

.page-content ul li {
  margin-bottom: var(--space-sm);
  color: var(--dark-gray);
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0;
}

.mb-sm {
  margin-bottom: var(--space-sm);
}

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

.mb-lg {
  margin-bottom: var(--space-lg);
}

.mb-xl {
  margin-bottom: var(--space-xl);
}

/* Media Queries */
@media (max-width: 992px) {
  h1 {
    font-size: 2.8rem;
  }
  
  h2 {
    font-size: 2.2rem;
  }
  
  .vision-content,
  .research-content,
  .contact-content {
    flex-direction: column;
  }
  
  .vision-image,
  .research-image {
    margin-top: var(--space-lg);
    order: -1;
  }
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  h1 {
    font-size: 2.2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  .section-title {
    margin-bottom: var(--space-md);
  }
  
  .section-subtitle {
    margin-bottom: var(--space-lg);
  }
  
  .footer-subscribe form {
    flex-direction: column;
  }
}

/* Cookie Consent */
#cookie-consent {
  box-shadow: 0 -5px 15px rgba(0, 0, 0, 0.1);
}

#accept-cookies:hover {
  background-color: #45a049;
}