:root {
  /* Монохромная цветовая схема */
  --color-primary: #1a1a1a;
  --color-primary-light: #333333;
  --color-primary-dark: #0d0d0d;
  --color-secondary: #404040;
  --color-accent: #808080;
  --color-light: #f0f0f0;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-100: #f8f8f8;
  --color-gray-200: #e6e6e6;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #b8b8b8;
  --color-gray-500: #9c9c9c;
  --color-gray-600: #707070;
  --color-gray-700: #505050;
  --color-gray-800: #303030;
  --color-gray-900: #181818;
  
  /* Тени */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.15);
  
  /* Скругления */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Размеры шрифтов */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.75rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  /* Шрифты */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Merriweather', serif;
  
  /* Переходы */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Отступы */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Контейнер */
  --container-padding: 1.5rem;
  --container-max-width: 1200px;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

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: var(--spacing-md);
  font-size: var(--font-size-base);
}

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

a:hover {
  color: var(--color-accent);
}

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

ul {
  list-style-type: none;
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  margin: var(--spacing-sm) auto 0;
}

.section-description {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  color: var(--color-gray-600);
  font-size: var(--font-size-md);
}

/* Кнопки - глобально */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--font-size-base);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

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

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

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

.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);
}

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

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

/* Изображения */
.image-container {
  overflow: hidden;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

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

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

.header.scrolled {
  padding: var(--spacing-xs) 0;
  background-color: rgba(255, 255, 255, 0.98);
}

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

.logo a {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  text-decoration: none;
}

.logo h1 {
  margin: 0;
  font-size: var(--font-size-xl);
}

.navigation {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}

.nav-links a {
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.burger-menu {
  display: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 20px;
}

.burger-menu span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-primary);
  transition: all var(--transition-normal);
}

/* Hero секция */
.hero {
  position: relative;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  padding: 180px 0 100px;
  color: var(--color-white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.4));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 650px;
}

.hero-content h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-content p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-lg);
  color: var(--color-white);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Методология секция */
.methodology {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-gray-100);
  position: relative;
  overflow: hidden;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
  gap: var(--spacing-xl);
}

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

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

.method-item .image-container {
  width: 100%;
  height: 300px;
  margin-bottom: 0;
  border-radius: 0;
}

.method-content {
  padding: var(--spacing-lg);
  text-align: center;
}

.method-content h3 {
  margin-bottom: var(--spacing-sm);
}

/* Услуги секция */
.services {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

/* Ресурсы секция */
.resources {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-gray-100);
}

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

.resource-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform var(--transition-normal);
}

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

.resource-card h3 {
  margin-bottom: var(--spacing-sm);
}

.resource-link {
  display: inline-block;
  margin-top: var(--spacing-sm);
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  transition: color var(--transition-normal);
}

.resource-link:hover {
  color: var(--color-accent);
}

/* Отзывы секция */
.testimonials {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-white);
  position: relative;
}

.testimonial-slider {
  position: relative;
  overflow: hidden;
}

.testimonial-slide {
  width: 100%;
}

.testimonial-slide .card {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  text-align: left;
  align-items: flex-start;
}

.testimonial-slide .card-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 var(--spacing-lg) 0 0;
  flex-shrink: 0;
}

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

.testimonial-slide .card-content {
  flex: 1;
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) 0;
  text-align: left;
}

.testimonial-text {
  font-style: italic;
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.testimonial-text::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: 0;
  font-size: 60px;
  color: var(--color-gray-300);
  font-family: serif;
}

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

.testimonial-position {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

.slider-controls {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-lg);
  gap: var(--spacing-sm);
}

.prev-btn,
.next-btn {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: var(--font-size-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-normal);
}

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

/* Клиенты секция */
.clientele {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-gray-100);
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  align-items: center;
}

.client-item {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.client-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.client-item .image-container {
  height: 120px;
  width: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
}

.client-item h4 {
  margin-bottom: 0;
  font-size: var(--font-size-base);
}

/* Контакты секция */
.contact {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-white);
}

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

.contact-info {
  padding-right: var(--spacing-lg);
}

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

.contact-item {
  margin-bottom: var(--spacing-lg);
}

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

.contact-item p {
  margin-bottom: 0;
  color: var(--color-gray-700);
}

.contact-form-container {
  background-color: var(--color-gray-100);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
}

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

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

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

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(26, 26, 26, 0.1);
}

.form-submit {
  margin-top: var(--spacing-sm);
}

/* Футер */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-branding h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.footer-branding p {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
}

.footer-links h4,
.footer-legal h4,
.footer-social h4 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.footer-links ul,
.footer-legal ul,
.footer-social ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-links a,
.footer-legal a,
.footer-social a {
  color: var(--color-gray-400);
  transition: color var(--transition-normal);
  font-size: var(--font-size-sm);
}

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

.social-links {
  display: flex;
  flex-direction: row !important;
  flex-wrap: wrap;
  gap: var(--spacing-md) !important;
}

.social-links a {
  display: inline-block;
  transition: transform var(--transition-normal);
}

.social-links a:hover {
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-800);
}

.footer-bottom p {
  color: var(--color-gray-500);
  font-size: var(--font-size-xs);
  margin-bottom: 0;
}

/* Модальное окно */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  max-width: 500px;
  width: 90%;
  position: relative;
  transform: translateY(-20px);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: translateY(0);
}

.close-modal {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  font-size: var(--font-size-xl);
  color: var(--color-gray-500);
  cursor: pointer;
  transition: color var(--transition-normal);
}

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

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

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

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

.success-content p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-gray-700);
}

/* Страницы Privacy и Terms */
.privacy-page,
.terms-page {
  padding-top: 100px;
  padding-bottom: var(--spacing-2xl);
}

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

.privacy-content h1,
.terms-content h1 {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

/* Анимация частиц */
.particles-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 1;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  pointer-events: none;
  opacity: 0;
  animation: float 15s infinite ease-in-out;
}

@keyframes float {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  25% {
    opacity: 0.5;
  }
  50% {
    opacity: 0.8;
  }
  75% {
    opacity: 0.5;
  }
  100% {
    transform: translateY(-200px) translateX(100px);
    opacity: 0;
  }
}

/* Медиа-запросы */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.75rem;
    --font-size-4xl: 2.25rem;
    --font-size-3xl: 1.75rem;
  }
  
  .method-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-info {
    padding-right: 0;
    margin-bottom: var(--spacing-lg);
  }
  
  .testimonial-slide .card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .testimonial-slide .card-image {
    margin: 0 0 var(--spacing-md) 0;
  }
  
  .testimonial-slide .card-content {
    text-align: center;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
  }
  
  .testimonial-text {
    padding-left: 0;
  }
  
  .testimonial-text::before {
    left: 50%;
    transform: translateX(-50%);
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }
  
  .header-inner {
    position: relative;
  }
  
  .navigation {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) 0;
    display: none;
    flex-direction: column;
    align-items: center;
  }
  
  .navigation.active {
    display: flex;
  }
  
  .nav-links {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }
  
  .nav-links li {
    width: 100%;
    text-align: center;
  }
  
  .nav-links a {
    display: block;
    padding: var(--spacing-sm) 0;
  }
  
  .burger-menu {
    display: flex;
  }
  
  .burger-menu.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }
  
  .burger-menu.active span:nth-child(2) {
    opacity: 0;
  }
  
  .burger-menu.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }
  
  .hero {
    padding: 150px 0 80px;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .method-item {
    flex-direction: column;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
    --font-size-xl: 1.125rem;
  }
  
  .hero {
    padding: 130px 0 60px;
  }
  
  .hero-content h1 {
    font-size: var(--font-size-4xl);
  }
  
  .hero-content p {
    font-size: var(--font-size-base);
  }
  
  .btn {
    width: 100%;
  }
  
  .testimonial-slide .card-image {
    width: 100px;
    height: 100px;
  }
}