:root {
  /* Основная палитра цветов */
  --primary-color: #ff3b3f;
  --primary-dark: #d62e32;
  --primary-light: #ff6b6e;
  --secondary-color: #2e71f0;
  --secondary-dark: #1b5ad9;
  --secondary-light: #5a91ff;
  --accent-color: #ffce00;
  --accent-dark: #e6b800;
  --accent-light: #ffdb4d;
  
  /* Нейтральные цвета */
  --dark: #121212;
  --dark-gray: #333333;
  --medium-gray: #777777;
  --light-gray: #e0e0e0;
  --lightest: #f8f9fa;
  
  /* Градиенты */
  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --gradient-secondary: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  --gradient-dark: linear-gradient(135deg, var(--dark), var(--dark-gray));
  
  /* Тени */
  --shadow-small: 0.25rem 0.25rem 0 var(--dark);
  --shadow-medium: 0.5rem 0.5rem 0 var(--dark);
  --shadow-large: 1rem 1rem 0 var(--dark);
  --shadow-inset: inset 0.25rem 0.25rem 0 var(--dark);
  
  /* Скругления */
  --radius-small: 0.25rem;
  --radius-medium: 0.5rem;
  --radius-large: 1rem;
  
  /* Основные размеры */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  
  /* Типографика */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  
  /* Анимации */
  --transition-fast: 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-normal: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-slow: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Контейнеры */
  --container-padding: 2rem;
  --container-max-width: 1200px;
}

/* Базовые стили */
* {
  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(--lightest);
  overflow-x: hidden;
}

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

/* Типографика */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--dark);
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.5rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.75rem;
}

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

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

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

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

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: var(--space-lg);
  position: relative;
  text-transform: uppercase;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--primary-color);
  margin: var(--space-sm) auto 0;
}

.section-description {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-xl);
  font-size: 1.1rem;
  color: var(--medium-gray);
}

/* Кнопки */
.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: 3px solid var(--dark);
  background-color: transparent;
  color: var(--dark);
  box-shadow: var(--shadow-small);
  transition: all var(--transition-normal);
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.btn:hover, 
button:hover, 
input[type='submit']:hover {
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow-medium);
}

.btn:active, 
button:active, 
input[type='submit']:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-small);
}

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

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

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

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

.outline-btn {
  background-color: transparent;
  border: 3px solid var(--dark);
}

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

.text-btn {
  border: none;
  background-color: transparent;
  box-shadow: none;
  padding: 0.5rem 0;
  position: relative;
  display: inline-flex;
  align-items: center;
}

.text-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.text-btn:hover {
  box-shadow: none;
  transform: none;
}

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

/* Хедер и навигация */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: 1rem 0;
}

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

.logo h1 {
  font-size: 1.75rem;
  margin: 0;
  color: var(--primary-color);
  font-weight: 800;
}

.desktop-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-md);
}

.desktop-nav a {
  color: var(--dark);
  font-weight: 600;
  position: relative;
}

.desktop-nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--primary-color);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

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

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

.mobile-menu {
  display: none;
}

.burger {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 24px;
  width: 30px;
}

.burger span {
  width: 100%;
  height: 3px;
  background-color: var(--dark);
  transition: all var(--transition-normal);
}

.mobile-nav {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: white;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

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

.mobile-nav ul {
  list-style: none;
  padding: var(--space-md);
}

.mobile-nav li {
  margin-bottom: var(--space-md);
}

.mobile-nav a {
  color: var(--dark);
  font-weight: 600;
  font-size: 1.2rem;
  display: block;
  padding: var(--space-sm) 0;
}

/* Hero секция */
.hero {
  padding: 12rem 0 8rem;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  position: relative;
  color: white;
}

.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 .container {
  position: relative;
  z-index: 2;
}

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

.hero-title {
  font-size: 4rem;
  margin-bottom: var(--space-sm);
  color: white;
  text-shadow: 2px 2px 0 var(--dark);
}

.hero-subtitle {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  color: white;
  font-weight: 600;
}

.hero-description {
  font-size: 1.2rem;
  margin-bottom: var(--space-xl);
  color: white;
}

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

/* About секция */
.about {
  padding: var(--space-xl) 0;
  background-color: var(--lightest);
}

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

.about-image {
  position: relative;
}

.image-container {
  position: relative;
  z-index: 2;
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
  transition: transform var(--transition-normal);
  overflow: hidden;
}

.image-container:hover {
  transform: translate(-8px, -8px);
  box-shadow: var(--shadow-large);
}

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

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

.about-text h3 {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.about-text p {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
}

/* Portfolio секция */
.portfolio {
  padding: var(--space-xl) 0;
  background-color: white;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
  background-color: white;
  overflow: hidden;
}

.card:hover {
  transform: translate(-8px, -8px);
  box-shadow: var(--shadow-large);
}

.card-image {
  width: 100%;
  height: 240px;
  overflow: hidden;
  position: relative;
}

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

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

.card-content {
  padding: var(--space-lg);
  width: 100%;
  text-align: center;
}

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

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

/* Testimonials секция */
.testimonials {
  padding: var(--space-xl) 0;
  background-color: var(--lightest);
}

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

.testimonials .card {
  padding: var(--space-lg);
  text-align: center;
}

.testimonials .card-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  margin-bottom: var(--space-md);
}

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

.testimonial-text {
  font-style: italic;
  margin-bottom: var(--space-md);
  position: relative;
}

.testimonial-text::before {
  content: '"';
  font-size: 4rem;
  color: var(--light-gray);
  position: absolute;
  top: -2rem;
  left: -1rem;
  opacity: 0.3;
}

.testimonial-author {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 0;
}

.testimonial-position {
  color: var(--medium-gray);
  margin-bottom: 0;
}

/* News секция */
.news {
  padding: var(--space-xl) 0;
  background-color: white;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.news .card-content .date {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--medium-gray);
  font-size: 0.9rem;
}

/* Research секция */
.research {
  padding: var(--space-xl) 0;
  background-color: var(--lightest);
}

.research-timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.research-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background-color: var(--primary-color);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.timeline-marker {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--primary-color);
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-small);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.timeline-content {
  width: calc(50% - 40px);
  padding: var(--space-lg);
  background-color: white;
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
}

.timeline-content:hover {
  transform: translate(-8px, -8px);
  box-shadow: var(--shadow-large);
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: auto;
}

.timeline-content img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  margin-top: var(--space-md);
  border: 2px solid var(--dark);
}

/* Press секция */
.press {
  padding: var(--space-xl) 0;
  background-color: white;
}

.press-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.press-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
  background-color: white;
  text-align: center;
}

.press-item:hover {
  transform: translate(-8px, -8px);
  box-shadow: var(--shadow-large);
}

.press-item img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  margin-bottom: var(--space-md);
}

.press-content h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}

.press-content p {
  margin-bottom: var(--space-sm);
  font-style: italic;
}

.press-content .date {
  color: var(--medium-gray);
  font-size: 0.9rem;
}

/* Resources секция */
.resources {
  padding: var(--space-xl) 0;
  background-color: var(--lightest);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

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

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

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

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

.info-item h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
}

.map-container {
  grid-column: span 2;
  margin-top: var(--space-lg);
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.map-container:hover {
  transform: translate(-8px, -8px);
  box-shadow: var(--shadow-large);
}

.map-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.contact-form {
  background-color: var(--lightest);
  padding: var(--space-lg);
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
}

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

.form-group.full-width {
  grid-column: span 2;
}

.form-group label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--dark);
  background-color: white;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

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

form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

/* Footer */
footer {
  background-color: var(--dark);
  color: white;
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.footer-logo h2 {
  color: white;
  margin-bottom: var(--space-sm);
}

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

.footer-links h3,
.footer-social h3,
.footer-contact h3 {
  color: white;
  font-size: 1.2rem;
  margin-bottom: var(--space-md);
}

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

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

.footer-links a,
.footer-social a {
  color: var(--light-gray);
  transition: color var(--transition-fast);
  position: relative;
}

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

.footer-links a::before,
.footer-social a::before {
  content: '→';
  margin-right: var(--space-sm);
  opacity: 0;
  transform: translateX(-10px);
  display: inline-block;
  transition: all var(--transition-normal);
}

.footer-links a:hover::before,
.footer-social a:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.footer-contact p {
  color: var(--light-gray);
  margin-bottom: var(--space-sm);
}

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

.footer-bottom p {
  margin-bottom: 0;
  color: var(--light-gray);
  font-size: 0.9rem;
}

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

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

.success-icon {
  font-size: 4rem;
  color: var(--primary-color);
  margin-bottom: var(--space-lg);
}

/* Privacy & Terms pages */
.privacy-page,
.terms-page {
  padding-top: 100px;
  padding-bottom: var(--space-xl);
}

.privacy-content,
.terms-content {
  max-width: 800px;
  margin: 0 auto;
  background-color: white;
  padding: var(--space-xl);
  border: 3px solid var(--dark);
  box-shadow: var(--shadow-medium);
}

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

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

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

.privacy-content ul li,
.terms-content ul li {
  margin-bottom: var(--space-sm);
}

/* Анимации */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

.animate-bounce {
  animation: bounce 2s infinite;
}

.animate-fade-in {
  animation: fade-in 1s forwards;
}

/* Адаптивные стили */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.5rem;
  }
  
  h1 {
    font-size: 3rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.5rem;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .about-image {
    order: -1;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .timeline-content {
    width: calc(100% - 40px);
    margin-left: 40px !important;
  }
  
  .research-timeline::before {
    left: 0;
  }
  
  .timeline-marker {
    left: 0;
    transform: none;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }
  
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu {
    display: block;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .contact-info {
    grid-template-columns: 1fr;
  }
  
  form {
    grid-template-columns: 1fr;
  }
  
  .form-group.full-width {
    grid-column: span 1;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .btn {
    width: 100%;
  }
}