/* 
 * CSS для Filtrationswus - Образовательная платформа для анализа энергетического сектора
 * Футуристический дизайн с биоморфными элементами
 * Раздельно-дополнительная цветовая схема
 */

/* Основные переменные */
:root {
  /* Основные цвета */
  --primary-color: #0066cc;
  --primary-dark: #004e9c;
  --primary-light: #3387e0;
  --primary-ultralight: #e6f0ff;
  
  /* Дополнительные цвета */
  --secondary-color: #ff6600;
  --secondary-dark: #cc5200;
  --secondary-light: #ff8533;
  
  /* Акцентные цвета */
  --accent-color: #00cc99;
  --accent-dark: #00a67a;
  --accent-light: #33dfb8;
  
  /* Нейтральные цвета */
  --neutral-dark: #1a1a2e;
  --neutral-medium: #4a4a6a;
  --neutral-light: #9090a8;
  --neutral-ultralight: #f2f2f7;
  
  /* Системные цвета */
  --error-color: #e34256;
  --success-color: #2cce8d;
  --warning-color: #ffc837;
  --info-color: #17a2b8;
  
  /* Градиенты */
  --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  --gradient-dark: linear-gradient(135deg, var(--neutral-dark) 0%, rgba(26, 26, 46, 0.95) 100%);
  
  /* Тени */
  --shadow-small: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-large: 0 8px 30px rgba(0, 0, 0, 0.15);
  
  /* Скругления */
  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-large: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Биоморфные переменные */
  --blob-radius: 70% 30% 50% 50% / 40% 60% 40% 60%;
  
  /* Размеры */
  --header-height: 80px;
  --footer-height: 400px;
  
  /* Анимации */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Шрифты */
  --font-heading: 'Manrope', sans-serif;
  --font-body: 'Rubik', sans-serif;
  
  /* Размеры шрифта */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  /* Контейнеры */
  --container-max-width: 1200px;
  --container-padding: 2rem;
}

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

html, body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-medium);
  background-color: var(--neutral-ultralight);
  scroll-behavior: smooth;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--neutral-dark);
  margin-bottom: 1rem;
}

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: 1.5rem;
}

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

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

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

ul, ol {
  list-style: none;
  padding-left: 0;
}

/* Контейнеры */
.container {
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  position: relative;
}

/* Секции */
section {
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  z-index: 1;
}

.section-title:after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: 1rem auto 0;
  border-radius: var(--radius-full);
}

.section-description {
  text-align: center;
  max-width: 800px;
  margin: -2rem auto 3rem;
  color: var(--neutral-medium);
  font-size: var(--font-size-lg);
}

/* Кнопки */
.btn, button, input[type='submit'] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--font-size-md);
  border-radius: var(--radius-medium);
  cursor: pointer;
  transition: all var(--transition-medium);
  text-align: center;
  text-decoration: none;
  border: none;
  box-shadow: var(--shadow-small);
  position: relative;
  overflow: hidden;
}

.btn:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(120deg, rgba(255,255,255,0) 30%, rgba(255,255,255,0.2), rgba(255,255,255,0) 70%);
  transform: translateX(-100%);
  transition: transform 0.6s ease-in-out;
}

.btn:hover:before {
  transform: translateX(100%);
}

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

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
  box-shadow: var(--shadow-medium);
  color: white;
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary-color) 100%);
  box-shadow: var(--shadow-medium);
  color: white;
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--primary-ultralight);
  color: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
}

/* Общие стили карточек */
.card {
  background: white;
  border-radius: var(--radius-large);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 2rem;
}

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

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

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

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

.card-content {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* Header */
.main-header {
  background-color: rgba(255, 255, 255, 0.95);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  box-shadow: var(--shadow-small);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

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

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

.logo h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
  margin: 0;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.main-nav li a {
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--neutral-medium);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.main-nav li a:after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-medium);
  border-radius: var(--radius-full);
}

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

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 6px;
}

.mobile-menu-toggle span {
  width: 30px;
  height: 3px;
  background: var(--primary-color);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
  padding-top: var(--header-height);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.5));
}

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

.hero-content h1 {
  color: white;
  font-size: var(--font-size-5xl);
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out;
}

.hero-content p {
  font-size: var(--font-size-xl);
  margin-bottom: 2rem;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: fadeInUp 1s ease-out 0.4s backwards;
}

/* About Section */
.about-section {
  background-color: white;
}

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

.about-image {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  transform: perspective(1000px) rotateY(-5deg);
  box-shadow: var(--shadow-large);
}

.about-image img {
  width: 100%;
  transition: transform 0.5s ease;
}

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

.about-text h3 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

/* Mission Section */
.mission-section {
  background-color: var(--neutral-ultralight);
  position: relative;
  overflow: hidden;
}

.mission-section:before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary-ultralight) 0%, transparent 70%);
  border-radius: 50%;
  top: -300px;
  left: -200px;
  z-index: 0;
}

.mission-section:after {
  content: '';
  position: absolute;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
  border-radius: 50%;
  bottom: -400px;
  right: -300px;
  opacity: 0.1;
  z-index: 0;
}

.mission-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.mission-image {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  transform: perspective(1000px) rotateY(5deg);
  box-shadow: var(--shadow-large);
}

.mission-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 4rem;
  text-align: center;
}

.stat-item {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-medium);
  transition: transform var(--transition-medium);
}

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

.stat-item h3 {
  color: var(--primary-color);
  font-size: var(--font-size-4xl);
  margin-bottom: 0.5rem;
}

/* Instructors Section */
.instructors-section {
  background-color: white;
  position: relative;
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.instructors-grid .card {
  text-align: center;
}

.instructors-grid .card-image {
  height: 300px;
  width: 300px;
  border-radius: 50%;
  margin: 2rem auto;
  overflow: hidden;
}

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

.instructor-role {
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: 1rem;
}

/* Pricing Section */
.pricing-section {
  background-color: var(--neutral-ultralight);
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
  z-index: 2;
}

.pricing-grid .card {
  transition: transform var(--transition-medium);
}

.pricing-grid .card-image {
  height: 250px;
}

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

.program-duration {
  font-size: var(--font-size-md);
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.features-list {
  margin-bottom: 2rem;
}

.features-list li {
  padding: 0.5rem 0;
  position: relative;
  padding-left: 1.75rem;
}

.features-list li:before {
  content: '✓';
  color: var(--success-color);
  position: absolute;
  left: 0;
  font-weight: 700;
}

.featured-card {
  transform: scale(1.05);
  box-shadow: var(--shadow-large);
  border: 2px solid var(--primary-light);
}

.featured-card:hover {
  transform: translateY(-10px) scale(1.05);
}

/* Resources Section */
.resources-section {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
}

.resources-section .section-title,
.resources-section .section-description {
  color: white;
}

.resources-section .section-title:after {
  background: white;
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.resource-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: var(--radius-large);
  transition: transform var(--transition-medium);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.resource-card:hover {
  transform: translateY(-10px);
  background: rgba(255, 255, 255, 0.15);
}

.resource-card h3 {
  color: white;
}

.resource-link {
  display: inline-block;
  margin-top: 1rem;
  color: white;
  font-weight: 500;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  transition: all var(--transition-fast);
}

.resource-link:hover {
  border-color: white;
  color: white;
}

/* Case Studies Section */
.case-studies-section {
  background-color: white;
  position: relative;
  overflow: hidden;
}

.case-studies-slider {
  overflow: hidden;
  margin-bottom: 2rem;
}

.case-study-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 2rem;
}

.case-study-card .card-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
  height: 300px;
}

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

.slider-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.prev-btn, .next-btn {
  background: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-small);
  transition: all var(--transition-fast);
}

.prev-btn:hover, .next-btn:hover {
  background: var(--primary-ultralight);
}

.prev-btn span, .next-btn span {
  border: solid var(--primary-color);
  border-width: 0 3px 3px 0;
  display: inline-block;
  padding: 3px;
}

.prev-btn span {
  transform: rotate(135deg);
  margin-right: -2px;
}

.next-btn span {
  transform: rotate(-45deg);
  margin-left: -2px;
}

.slider-dots {
  display: flex;
  gap: 0.5rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neutral-light);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.dot.active, .dot:hover {
  background: var(--primary-color);
}

/* Clientele Section */
.clientele-section {
  background-color: var(--neutral-ultralight);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.testimonials-grid .card-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  margin-top: -75px;
  border: 5px solid white;
  overflow: hidden;
}

.testimonials-grid .card {
  margin-top: 75px;
  text-align: center;
}

.testimonials-grid .card-content {
  padding-top: 1rem;
}

.testimonial-text {
  margin-bottom: 1.5rem;
  font-style: italic;
}

.testimonial-author h4 {
  color: var(--primary-color);
  margin-bottom: 0.25rem;
}

.clients-logos {
  text-align: center;
}

.clients-logos h3 {
  margin-bottom: 2rem;
  font-size: var(--font-size-xl);
}

.logos-container {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.logos-container img {
  filter: grayscale(100%);
  opacity: 0.7;
  transition: all var(--transition-medium);
  max-width: 180px;
  max-height: 80px;
  object-fit: contain;
  margin: 0 auto;
}

.logos-container img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* Media Section */
.media-section {
  background-color: white;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.media-card .card-image {
  height: 225px;
}

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

/* Contact Section */
.contact-section {
  background-color: var(--neutral-ultralight);
  position: relative;
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.info-item {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-small);
}

.info-item h3 {
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.info-item p {
  margin-bottom: 0.75rem;
}

.info-item img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-medium);
}

.contact-form {
  background: white;
  padding: 3rem;
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-medium);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--neutral-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--neutral-light);
  border-radius: var(--radius-medium);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast);
}

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

.form-toggle {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--neutral-light);
  transition: var(--transition-medium);
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: var(--transition-medium);
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

/* Footer */
.main-footer {
  background: var(--neutral-dark);
  color: white;
  padding: 5rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-logo h2 {
  color: white;
  font-size: var(--font-size-3xl);
  margin-bottom: 1rem;
  background: linear-gradient(45deg, var(--primary-light), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.link-column h3 {
  color: white;
  font-size: var(--font-size-lg);
  margin-bottom: 1.5rem;
  position: relative;
}

.link-column h3:after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--primary-light);
  margin-top: 0.75rem;
  border-radius: var(--radius-full);
}

.link-column ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.link-column a {
  color: var(--neutral-light);
  transition: color var(--transition-fast);
}

.link-column a:hover {
  color: white;
}

.social-links a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--neutral-light);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Success Page */
.success-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  background-color: var(--neutral-ultralight);
}

.success-content {
  max-width: 600px;
}

.success-icon {
  font-size: 5rem;
  color: var(--success-color);
  margin-bottom: 2rem;
}

.success-actions {
  margin-top: 2rem;
}

/* Privacy and Terms Pages */
.page-content {
  padding-top: 150px;
  padding-bottom: 5rem;
}

.page-content h1 {
  margin-bottom: 2rem;
}

.page-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1.5rem;
}

.page-content p {
  margin-bottom: 1.5rem;
}

.page-content ul {
  list-style: disc;
  padding-left: 2rem;
  margin-bottom: 1.5rem;
}

/* Анимации */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0px);
  }
}

/* Медиа-запросы */
@media (max-width: 1200px) {
  :root {
    --container-padding: 1.5rem;
  }
  
  h1 {
    font-size: calc(var(--font-size-5xl) * 0.9);
  }
  
  h2 {
    font-size: calc(var(--font-size-4xl) * 0.9);
  }
  
  .about-content,
  .mission-content {
    gap: 3rem;
  }
  
  .mission-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .instructors-grid,
  .pricing-grid,
  .resources-grid,
  .media-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .case-study-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .case-study-card .card-image {
    margin: 0 auto;
    max-width: 500px;
  }
  
  .footer-content {
    gap: 3rem;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: white;
    padding: 1.5rem;
    box-shadow: var(--shadow-medium);
  }
  
  .main-nav.active {
    display: block;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: 1rem;
  }
  
  .about-content,
  .mission-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .contact-container {
    grid-template-columns: 1fr;
  }
  
  .contact-info {
    order: 2;
  }
  
  .contact-form {
    order: 1;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-logo {
    text-align: center;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }
  
  section {
    padding: 4rem 0;
  }
  
  h1 {
    font-size: calc(var(--font-size-5xl) * 0.8);
  }
  
  h2 {
    font-size: calc(var(--font-size-4xl) * 0.8);
  }
  
  h3 {
    font-size: calc(var(--font-size-3xl) * 0.8);
  }
  
  .hero-content {
    max-width: 600px;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  
  .instructors-grid,
  .pricing-grid,
  .resources-grid,
  .media-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid .featured-card {
    transform: scale(1);
  }
  
  .pricing-grid .featured-card:hover {
    transform: translateY(-10px);
  }
  
  .mission-stats {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .link-column {
    text-align: center;
  }
  
  .link-column h3:after {
    margin-left: auto;
    margin-right: auto;
  }
}

/* Полифил для IE */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  .card {
    display: block;
  }
  
  .container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
  }
  
  .footer-content,
  .footer-links,
  .instructors-grid,
  .pricing-grid,
  .resources-grid,
  .media-grid,
  .testimonials-grid,
  .about-content,
  .mission-content,
  .mission-stats {
    display: flex;
    flex-wrap: wrap;
  }
}

/* Utils */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 1rem; padding-bottom: 1rem; }
.py-4 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

.px-1 { padding-left: 0.25rem; padding-right: 0.25rem; }
.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 1rem; padding-right: 1rem; }
.px-4 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-5 { padding-left: 3rem; padding-right: 3rem; }