/* ============================================
   CSS Variables и базовые настройки
   ============================================ */

:root {
  /* Цвета */
  --color-primary: #1a2332;
  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-light: #f9fafb;
  --color-bg-dark: #f3f4f6;
  --color-border: #e5e7eb;

  /* Типографика */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Размеры контейнера */
  --container-max-width: 1280px;
  --container-padding: 1rem;

  /* Радиусы */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Тени */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Переходы */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 400ms ease-in-out;

  /* Высота шапки */
  --header-height: 72px;
  --header-height-mobile: 64px;
}

/* ============================================
   Reset и базовые стили
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

/* ============================================
   Skip link (доступность)
   ============================================ */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   Утилиты
   ============================================ */

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

.section {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.section__title {
  font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section__subtitle {
  font-size: clamp(var(--font-size-base), 2vw, var(--font-size-lg));
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 800px;
}

/* ============================================
   Кнопки
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  min-height: 44px;
  text-align: center;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

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

.btn--large {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
}

/* ============================================
   Шапка сайта
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: transparent;
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
  height: var(--header-height);
}

.header--scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header__logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--font-size-xl);
}

.header__logo-icon,
.footer__logo-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
  display: block;
}

.footer__logo-icon {
  width: 32px;
  height: 32px;
}

.header__logo-text {
  white-space: nowrap;
}

.header__nav-list {
  display: flex;
  gap: 1.5rem;
}

.header__nav-link {
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-normal);
}

.header__nav-link:hover::after {
  width: 100%;
}

.header__cta-btn {
  background-color: var(--color-accent);
  color: white;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-normal);
}

.header__cta-btn:hover {
  background-color: var(--color-accent-light);
  transform: translateY(-1px);
}

.header__burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0.5rem;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.header__burger-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: all var(--transition-normal);
}

/* Мобильное меню */
.header__mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: white;
  z-index: 999;
  padding: 2rem 1rem;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.header__mobile-menu--open {
  transform: translateX(0);
}

.header__mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.header__mobile-nav-link {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text);
  padding: 0.75rem 0;
  display: block;
}

.header__mobile-cta-btn {
  width: 100%;
  background-color: var(--color-accent);
  color: white;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-lg);
  margin-top: 1rem;
}

/* ============================================
   Hero секция
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg) 100%);
  position: relative;
  overflow: hidden;
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero__content {
  z-index: 1;
}

.hero__title {
  font-size: clamp(var(--font-size-4xl), 5vw, var(--font-size-5xl));
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: clamp(var(--font-size-base), 2vw, var(--font-size-lg));
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero__markers {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero__marker {
  background-color: var(--color-bg-dark);
  color: var(--color-text);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.hero__buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__tech-composition {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* ============================================
   О компании
   ============================================ */

.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about__text p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
  font-size: var(--font-size-base);
}

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

.about__stage {
  background-color: var(--color-bg-light);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.about__stage:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.about__stage-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.about__stage-text {
  font-weight: 500;
  color: var(--color-text);
}

/* ============================================
   Направления (Solutions)
   ============================================ */

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

.solution-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
}

.solution-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.solution-card__icon {
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.solution-card__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.solution-card__text {
  color: var(--color-text-light);
  font-size: var(--font-size-base);
}

/* ============================================
   Энергетика
   ============================================ */

.energy__content {
  display: grid;
  gap: 2rem;
}

.energy__text p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

.energy__components-title,
.energy__info-box-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.energy__components-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.energy__components-list li {
  padding: 0.75rem 1rem;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  border-left: 3px solid var(--color-accent);
}

.energy__info-box {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: white;
  padding: 2rem;
  border-radius: var(--radius-lg);
}

.energy__info-box-title {
  color: white;
}

/* ============================================
   Искусственный интеллект
   ============================================ */

.ai__content {
  display: grid;
  gap: 2rem;
}

.ai__text p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

.ai__capabilities-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.ai__capabilities-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.ai__capabilities-list li {
  padding: 0.75rem 1rem;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  position: relative;
  padding-left: 1.5rem;
}

.ai__capabilities-list li::before {
  content: '→';
  position: absolute;
  left: 0.75rem;
  color: var(--color-accent);
}

.ai__note {
  background-color: var(--color-bg-dark);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-accent);
}

.ai__note p {
  color: var(--color-text);
  font-style: italic;
}

/* ============================================
   Видеоаналитика и безопасность
   ============================================ */

.security__content {
  display: grid;
  gap: 2rem;
}

.security__text p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

.security__scenarios-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.security__scenarios-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.security__scenarios-list li {
  padding: 0.75rem 1rem;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  position: relative;
  padding-left: 1.5rem;
}

.security__scenarios-list li::before {
  content: '✓';
  position: absolute;
  left: 0.75rem;
  color: var(--color-accent);
  font-weight: 700;
}

.security__highlight-card {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(59, 130, 246, 0.1) 100%);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.security__highlight-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.security__highlight-card p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

.security__highlight-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.security__highlight-list li {
  padding: 0.5rem 0.75rem;
  font-size: var(--font-size-sm);
  position: relative;
  padding-left: 1.5rem;
}

.security__highlight-list li::before {
  content: '•';
  position: absolute;
  left: 0.5rem;
  color: var(--color-accent);
  font-weight: 700;
}

/* ============================================
   Инженерные услуги
   ============================================ */

.engineering__content {
  display: grid;
  gap: 2rem;
}

.engineering__text p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

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

.engineering__service {
  background-color: var(--color-bg-light);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  border-left: 3px solid var(--color-accent);
  transition: all var(--transition-normal);
}

.engineering__service:hover {
  background-color: var(--color-bg-dark);
  transform: translateX(4px);
}

.engineering__process-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

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

.engineering__step {
  text-align: center;
  padding: 1.5rem 1rem;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.engineering__step:hover {
  background-color: var(--color-bg-dark);
  transform: translateY(-2px);
}

.engineering__step-number {
  width: 48px;
  height: 48px;
  background-color: var(--color-accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-xl);
  margin: 0 auto 0.75rem;
}

.engineering__step-text {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

/* ============================================
   Оборудование и сервис
   ============================================ */

.equipment__content {
  display: grid;
  gap: 2rem;
}

.equipment__text p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

.equipment__list-title,
.equipment__service-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.equipment__items,
.equipment__service-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.equipment__items li,
.equipment__service-list li {
  padding: 0.75rem 1rem;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  position: relative;
  padding-left: 1.5rem;
}

.equipment__items li::before {
  content: '▸';
  position: absolute;
  left: 0.75rem;
  color: var(--color-accent);
}

.equipment__service-list li::before {
  content: '✓';
  position: absolute;
  left: 0.75rem;
  color: var(--color-accent);
  font-weight: 700;
}

.equipment__note {
  background-color: var(--color-bg-dark);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-text-light);
}

.equipment__note p {
  color: var(--color-text-light);
  font-style: italic;
}

/* ============================================
   Преимущества
   ============================================ */

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

.advantage-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--color-accent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.advantage-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.advantage-card:hover::before {
  opacity: 1;
}

.advantage-card__number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  opacity: 0.3;
}

.advantage-card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.advantage-card__text {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ============================================
   Контакты
   ============================================ */

.contacts__content {
  display: grid;
  gap: 2rem;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.contacts__text {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

.contacts__info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: left;
  margin-top: 2rem;
}

.contacts__info-item {
  padding: 1.5rem;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.contacts__info-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.contacts__info-value {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
}

.contacts__info-value a {
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

.contacts__info-value a:hover {
  color: var(--color-accent-light);
}

/* ============================================
   Футер
   ============================================ */

.footer {
  background-color: var(--color-primary);
  color: white;
  padding: 3rem 0 2rem;
}

.footer__container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}

.footer__brand {
  grid-column: 1 / -1;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer__logo-icon {
  color: var(--color-accent-light);
}

.footer__company-name {
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.footer__description {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  max-width: 600px;
}

.footer__details {
  grid-column: 1 / -1;
}

.footer__requisites {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__requisite {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
  grid-column: 1 / -1;
}

.footer__link {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: white;
}

.footer__copyright {
  grid-column: 1 / -1;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ============================================
   Модальное окно
   ============================================ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay--visible {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: white;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-overlay--visible .modal {
  transform: scale(1);
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal__close:hover {
  color: var(--color-text);
}

.modal__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.modal__text {
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

.modal__contacts {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.modal__contact-item {
  display: grid;
  gap: 0.25rem;
}

.modal__contact-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.modal__contact-value {
  font-weight: 500;
  color: var(--color-text);
}

.modal__contact-value a {
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

.modal__contact-value a:hover {
  color: var(--color-accent-light);
}

.modal__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.modal__actions .btn {
  flex: 1;
  min-width: 140px;
}

/* ============================================
   Анимации появления при скролле
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Адаптивность — Планшеты (до 1024px)
   ============================================ */

@media (max-width: 1024px) {
  :root {
    --container-padding: 1.5rem;
  }

  .section {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  .hero__container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__content {
    order: 1;
  }

  .hero__visual {
    order: 0;
    margin-bottom: 2rem;
  }

  .hero__tech-composition {
    max-width: 300px;
  }

  .hero__buttons {
    justify-content: center;
  }

  .hero__markers {
    justify-content: center;
  }

  .about__content {
    grid-template-columns: 1fr;
  }

  .solutions__grid {
    grid-template-columns: 1fr;
  }

  .energy__components-list,
  .ai__capabilities-list,
  .security__scenarios-list,
  .security__highlight-list,
  .engineering__services-grid,
  .equipment__items,
  .equipment__service-list {
    grid-template-columns: 1fr;
  }

  .engineering__process-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .advantages__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contacts__info {
    grid-template-columns: 1fr;
  }

  .footer__container {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Адаптивность — Мобильные (до 768px)
   ============================================ */

@media (max-width: 768px) {
  :root {
    --header-height: var(--header-height-mobile);
    --container-padding: 1rem;
  }

  .section {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }

  .header__nav,
  .header__cta-btn {
    display: none;
  }

  .header__burger {
    display: flex;
  }

  .header__mobile-menu {
    display: block;
  }

  .hero {
    min-height: auto;
    padding-top: var(--header-height);
    padding-bottom: 3rem;
  }

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

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .hero__buttons {
    flex-direction: column;
  }

  .hero__buttons .btn {
    width: 100%;
  }

  .about__stages {
    grid-template-columns: 1fr;
  }

  .engineering__process-steps {
    grid-template-columns: 1fr;
  }

  .advantages__grid {
    grid-template-columns: 1fr;
  }

  .footer__requisites {
    flex-direction: column;
    gap: 0.5rem;
  }

  .footer__links {
    flex-direction: column;
    gap: 0.75rem;
  }

  .modal {
    padding: 1.5rem;
  }

  .modal__actions {
    flex-direction: column;
  }

  .modal__actions .btn {
    width: 100%;
  }
}

/* ============================================
   Адаптивность — Маленькие экраны (до 480px)
   ============================================ */

@media (max-width: 480px) {
  :root {
    --container-padding: 0.75rem;
  }

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

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

  .hero__markers {
    flex-direction: column;
  }

  .solution-card,
  .advantage-card,
  .engineering__step,
  .contacts__info-item {
    padding: 1.25rem;
  }

  .energy__info-box,
  .security__highlight-card {
    padding: 1.25rem;
  }
}

/* ============================================
   Предпочтение уменьшенного движения
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ============================================
   Печать
   ============================================ */

@media print {
  .header,
  .header__mobile-menu,
  .modal-overlay,
  .hero__visual {
    display: none;
  }

  body {
    color: black;
    background: white;
  }

  .section {
    padding-top: 1rem;
    padding-bottom: 1rem;
    page-break-inside: avoid;
  }

  .hero {
    min-height: auto;
    padding-top: 1rem;
  }
}