:root {
  /* Монохромная цветовая схема */
  --color-primary: #3a7bd5;
  --color-primary-dark: #2c5ba0;
  --color-primary-light: #5b93e0;
  --color-primary-lighter: #89b2eb;
  --color-primary-lightest: #c7d9f5;
  
  --color-secondary: #f3f3f3;
  --color-secondary-dark: #e0e0e0;
  --color-secondary-darker: #cccccc;
  
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  
  --color-background: #ffffff;
  --color-background-alt: #f9f9f9;
  --color-background-dark: #f0f0f0;
  
  --color-success: #4CAF50;
  --color-error: #f44336;
  --color-warning: #ff9800;
  
  /* Градиенты */
  --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  --gradient-secondary: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
  
  /* Тени */
  --shadow-small: 0 2px 5px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.12);
  
  /* Скругления */
  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-large: 16px;
  
  /* Отступы */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  
  /* Шрифты */
  --font-heading: 'Roboto', sans-serif;
  --font-body: 'Lato', sans-serif;
  
  /* Анимации */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

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

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

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

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

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

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

/* Утилиты */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  font-size: 2.2rem;
  padding-bottom: var(--spacing-sm);
}

.section-title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: var(--color-primary);
}

.section-description {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
  color: var(--color-text-light);
}

/* Глобальные стили кнопок */
.btn, 
button, 
input[type='submit'] {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-small);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-medium);
  text-align: center;
  text-decoration: none;
  box-shadow: var(--shadow-small);
}

.btn:hover, 
button:hover, 
input[type='submit']:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.btn:active, 
button:active, 
input[type='submit']:active {
  transform: translateY(0);
}

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

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

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

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: white;
  box-shadow: var(--shadow-small);
  transition: all var(--transition-medium);
}

.header.scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--color-primary);
}

.logo a {
  color: inherit;
  text-decoration: none;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-sm);
}

.main-nav a {
  font-weight: 500;
  padding: 0.5rem;
  position: relative;
  color: var(--color-text);
  text-decoration: none;
}

.main-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--color-primary);
  transition: width var(--transition-medium);
}

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

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

.hamburger-menu {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.bar {
  width: 25px;
  height: 3px;
  background-color: var(--color-text);
  margin: 3px 0;
  transition: all var(--transition-medium);
}

/* Hero Section */
.hero {
  position: relative;
  padding: 120px 0 80px;
  display: flex;
  align-items: center;
  min-height: 80vh;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: white;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5));
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  text-align: left;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
  color: white;
  font-weight: 700;
}

.hero-content h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  color: white;
  font-weight: 400;
}

.hero-content p {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  color: white;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.particle-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* About Section */
.about-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.about-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-lg);
}

.about-image {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
}

.image-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-medium);
  transition: transform var(--transition-medium);
}

.image-container:hover {
  transform: scale(1.02);
}

.about-text {
  flex: 1 1 500px;
}

.about-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* Vision Section */
.vision-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background-alt);
}

.vision-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-lg);
}

.vision-text {
  flex: 1 1 500px;
  order: 1;
}

.vision-image {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
  order: 2;
}

/* Mission Section */
.mission-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.mission-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-lg);
}

.mission-image {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
}

.mission-text {
  flex: 1 1 500px;
}

.mission-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* Community Section */
.community-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background-alt);
}

.community-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-lg);
}

.community-text {
  flex: 1 1 500px;
  order: 1;
}

.community-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.community-image {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
  order: 2;
}

/* Research Section */
.research-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.research-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-lg);
}

.research-image {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
}

.research-text {
  flex: 1 1 500px;
}

.research-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* External Resources */
.external-resources {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background-alt);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.resource-card {
  background-color: var(--color-background);
  border-radius: var(--radius-medium);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
  transition: transform var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
}

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

.card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

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

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

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

.card-content h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.card-content a {
  display: inline-block;
  margin-top: var(--spacing-sm);
  color: var(--color-primary);
  font-weight: 600;
  position: relative;
}

.card-content a::after {
  content: '→';
  position: relative;
  top: 0;
  right: -5px;
  transition: right var(--transition-fast);
}

.card-content a:hover::after {
  right: -10px;
}

/* Sustainability Section */
.sustainability-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.sustainability-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-lg);
}

.sustainability-text {
  flex: 1 1 500px;
  order: 1;
}

.sustainability-text h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.sustainability-image {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
  order: 2;
}

/* Media Section */
.media-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background-alt);
}

.media-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-md);
}

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

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

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

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

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

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

/* Instructors Section */
.instructors-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

/* Partners Section */
.partners-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background-alt);
}

.partners-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-lg);
}

.partner-logo {
  flex: 0 0 200px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-medium);
}

.partner-logo:hover {
  transform: scale(1.05);
}

.partner-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Contact Section */
.contact-section {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-background);
}

.contact-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.contact-info {
  flex: 1 1 350px;
}

.contact-form-container {
  flex: 1 1 450px;
}

.info-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.info-item i {
  margin-right: var(--spacing-sm);
  color: var(--color-primary);
  font-size: 1.2rem;
  margin-top: 3px;
}

.contact-map {
  margin-top: var(--spacing-md);
  border-radius: var(--radius-medium);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
}

.contact-map img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.contact-form {
  background-color: var(--color-background);
  padding: var(--spacing-md);
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-medium);
}

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

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--color-secondary-darker);
  border-radius: var(--radius-small);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-lightest);
}

/* Footer */
.footer {
  background-color: var(--color-text);
  color: white;
  padding: var(--spacing-lg) 0 var(--spacing-sm);
}

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

.footer-section h3 {
  color: white;
  margin-bottom: var(--spacing-sm);
  position: relative;
  padding-bottom: 10px;
}

.footer-section h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background-color: var(--color-primary);
}

.footer-section p {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

.footer-section.about .contact-info {
  margin-top: var(--spacing-sm);
}

.footer-section.about .contact-info span {
  display: block;
  margin-bottom: 8px;
  color: var(--color-secondary);
  font-size: 0.9rem;
}

.footer-section.about .contact-info i {
  margin-right: 10px;
  color: var(--color-primary-light);
}

.footer-section.links ul,
.footer-section.legal ul {
  list-style: none;
}

.footer-section.links li,
.footer-section.legal li {
  margin-bottom: 8px;
}

.footer-section.links a,
.footer-section.legal a {
  color: var(--color-secondary);
  transition: color var(--transition-fast);
}

.footer-section.links a:hover,
.footer-section.legal a:hover {
  color: var(--color-primary-light);
}

.footer-section.social .social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-section.social .social-links a {
  color: var(--color-secondary);
  margin-right: var(--spacing-sm);
  transition: color var(--transition-fast);
  text-decoration: none;
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--color-secondary-dark);
  border-radius: var(--radius-small);
}

.footer-section.social .social-links a:hover {
  color: white;
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

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

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

.footer-bottom a {
  color: var(--color-primary-light);
}

.footer-bottom a:hover {
  text-decoration: underline;
}

/* Success page */
.success-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-sm);
}

.success-container {
  max-width: 600px;
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-medium);
}

.success-icon {
  color: var(--color-success);
  font-size: 5rem;
  margin-bottom: var(--spacing-md);
}

.success-message h1 {
  color: var(--color-success);
  margin-bottom: var(--spacing-sm);
}

.success-message p {
  margin-bottom: var(--spacing-md);
}

/* Privacy and Terms pages */
.privacy-page,
.terms-page {
  padding-top: 150px;
  padding-bottom: var(--spacing-xl);
}

.privacy-content,
.terms-content {
  max-width: 800px;
  margin: 0 auto;
}

.privacy-content h1,
.terms-content h1 {
  margin-bottom: var(--spacing-md);
}

.privacy-content h2,
.terms-content h2 {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.privacy-content p,
.terms-content p {
  margin-bottom: var(--spacing-sm);
}

.privacy-content ul,
.terms-content ul {
  margin-bottom: var(--spacing-md);
  margin-left: var(--spacing-md);
}

.privacy-content li,
.terms-content li {
  margin-bottom: var(--spacing-xs);
}

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

.fade-in {
  animation: fadeIn 1s ease;
}

/* Адаптивность */
@media (max-width: 992px) {
  h1 {
    font-size: 2.2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h3 {
    font-size: 1.3rem;
  }
  
  .hero-content h1 {
    font-size: 2.8rem;
  }
  
  .hero-content h2 {
    font-size: 1.8rem;
  }
  
  .about-content,
  .vision-content,
  .mission-content,
  .community-content,
  .research-content,
  .sustainability-content {
    flex-direction: column;
  }
  
  .vision-text,
  .community-text,
  .sustainability-text {
    order: 2;
  }
  
  .vision-image,
  .community-image,
  .sustainability-image {
    order: 1;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: var(--shadow-medium);
    padding: var(--spacing-sm) 0;
  }
  
  .main-nav.active {
    display: block;
  }
  
  .main-nav ul {
    flex-direction: column;
    text-align: center;
  }
  
  .main-nav li {
    margin: var(--spacing-xs) 0;
  }
  
  .hamburger-menu {
    display: flex;
  }
  
  .hero-content h1 {
    font-size: 2.2rem;
  }
  
  .hero-content h2 {
    font-size: 1.5rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
  
  .cta-buttons {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .cta-buttons .btn {
    width: 100%;
  }
  
  .partners-grid {
    gap: var(--spacing-sm);
  }
  
  .partner-logo {
    flex: 0 0 150px;
    height: 80px;
  }
  
  .contact-container {
    flex-direction: column;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .resources-grid,
  .media-gallery,
  .instructors-grid {
    grid-template-columns: 1fr;
  }
  
  .hero {
    padding: 100px 0 60px;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
}