.header {
  position: sticky;
  top: 0;
  left: 0;
  z-index: 900;
  width: 100%;
  background-color: var(--background-color-light);
  box-shadow: 0 4px 18px rgba(15, 42, 67, 0.08);
}

.header__container {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.header__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--color-text-default);
  text-decoration: none;
}

.logo-background {
  background: linear-gradient(
    135deg,
    var(--color-accent-dark-blue) 0%,
    var(--color-accent-blue) 100%
  );
  border-radius: 10px;
}

.header__logo {
  display: block;
  width: 50px;
  height: 50px;
  object-fit: contain;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}

.navbar__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.navbar__item {
  position: relative;
  margin: 0;
  padding: 0;
}

/* Переиспользуем стандартный стиль ссылки навигации */
.navbar__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 0;
  color: var(--color-text-default);
  text-decoration: none;
  white-space: nowrap;
  border: none;
  background-color: transparent;
  cursor: pointer;
  transition: color 0.3s ease-in-out;
}

.navbar__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 2px;
  background-color: var(--color-accent-cyan);
  border-radius: 10px;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease-in-out;
}

.navbar__link:hover {
  color: var(--color-accent-blue);
}

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

.navbar__dropdown-button {
  font-family: inherit;
}

.navbar__arrow {
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.3s ease-in-out;
}

.navbar__item--dropdown:hover .navbar__arrow,
.navbar__item--dropdown.is-open .navbar__arrow {
  transform: rotate(-45deg) translateY(-1px);
}

.navbar__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 20;
  width: 360px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--background-color-light);
  border: 1px solid var(--color-border-2);
  border-radius: 10px;
  box-shadow: 0 18px 35px rgba(15, 42, 67, 0.14);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition:
    opacity 0.3s ease-in-out,
    visibility 0.3s ease-in-out,
    transform 0.3s ease-in-out;
}

.navbar__dropdown::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 0;
  width: 100%;
  height: 8px;
}

.navbar__item--dropdown:hover .navbar__dropdown,
.navbar__item--dropdown.is-open .navbar__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.navbar__dropdown-item {
  margin: 0;
  padding: 0;
}

/* Переиспользуем стандартный dropdown-стиль */
.navbar__dropdown-link {
  display: block;
  padding: 10px;
  color: var(--color-text-default);
  text-decoration: none;
  border-radius: 10px;
  transition:
    color 0.3s ease-in-out,
    background-color 0.3s ease-in-out;
}

.navbar__dropdown-link:hover {
  color: var(--color-accent-blue);
  background-color: var(--background-color-light-blue);
}

.header__contacts {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  flex-shrink: 0;
}

.header__phone {
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.3s ease-in-out;
}

.header__phone:hover {
  color: var(--color-accent-blue);
}

.header__burger {
  display: none;
  position: relative;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  padding: 0;
  border: none;
  border-radius: 10px;
  background-color: var(--background-color-light-gray);
  cursor: pointer;
  transition:
    background-color 0.3s ease-in-out,
    box-shadow 0.3s ease-in-out;
}

.header__burger:hover {
  background-color: var(--background-color-light-blue);
  box-shadow: 0 8px 18px rgba(15, 42, 67, 0.12);
}

.header__burger-line {
  position: absolute;
  left: 12px;
  width: 24px;
  height: 2px;
  background-color: var(--color-accent-dark-blue);
  border-radius: 10px;
  transition:
    top 0.3s ease-in-out,
    transform 0.3s ease-in-out,
    opacity 0.3s ease-in-out;
}

.header__burger-line:nth-child(1) {
  top: 16px;
}

.header__burger-line:nth-child(2) {
  top: 23px;
}

.header__burger-line:nth-child(3) {
  top: 30px;
}

.header__burger.is-active .header__burger-line:nth-child(1) {
  top: 23px;
  transform: rotate(45deg);
}

.header__burger.is-active .header__burger-line:nth-child(2) {
  opacity: 0;
}

.header__burger.is-active .header__burger-line:nth-child(3) {
  top: 23px;
  transform: rotate(-45deg);
}

.header__mobile-menu {
  display: none;
}

.mobile-navbar {
  display: none;
}

@media (max-width: 1199px) {
  .header__container {
    min-height: 78px;
    gap: 20px;
  }

  .header__logo {
    width: 48px;
    height: 48px;
  }

  .navbar__list {
    gap: 10px;
  }

  .navbar__link {
    padding: 10px;
  }

  .navbar__dropdown-link {
    padding: 10px;
  }

  .navbar__dropdown {
    width: 340px;
  }
}

@media (max-width: 991px) {
  .header__container {
    min-height: 76px;
    gap: 5px;
  }

  .header__brand {
    gap: 10px;
  }

  .navbar {
    display: none;
  }

  .header__contacts {
    display: none;
  }

  .header__burger {
    display: block;
  }

  .header__mobile-menu {
    position: fixed;
    top: 76px;
    left: 0;
    z-index: 899;
    display: block;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    box-shadow: 0 18px 28px rgba(15, 42, 67, 0.12);
    transition: max-height 0.4s ease-in-out;
  }

  .header__mobile-menu.is-open {
    max-height: calc(100vh - 76px);
    overflow-y: auto;
  }

  .mobile-navbar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 720px;
    margin: 0 auto;
    padding-top: 20px;
    padding-bottom: 20px;
  }

  .mobile-navbar__list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .mobile-navbar__item {
    margin: 0;
    padding: 0;
  }

  /*
    Мобильная ссылка использует общий стиль навигации,
    но без underline-анимации, чтобы сохранить старое поведение mobile nav.
  */
  .mobile-navbar__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 5px;
    width: 100%;
    padding: 10px;
    color: var(--color-text-default);
    text-align: left;
    text-decoration: none;
    border: none;
    border-radius: 10px;
    background-color: transparent;
    cursor: pointer;
    transition:
      color 0.3s ease-in-out,
      background-color 0.3s ease-in-out;
  }

  .mobile-navbar__link::after {
    display: none;
  }

  .mobile-navbar__link:hover {
    color: var(--color-accent-blue);
    background-color: var(--background-color-light-blue);
  }

  .mobile-navbar__dropdown-button {
    font-family: inherit;
  }

  .mobile-navbar__arrow {
    flex-shrink: 0;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg) translateY(-2px);
    transition: transform 0.3s ease-in-out;
  }

  .mobile-navbar__item--dropdown.is-open .mobile-navbar__arrow {
    transform: rotate(-45deg) translateY(-1px);
  }

  .mobile-navbar__dropdown {
    max-height: 0;
    overflow: hidden;
    margin: 0;
    padding: 0;
    list-style: none;
    transition: max-height 0.4s ease-in-out;
  }

  .mobile-navbar__item--dropdown.is-open .mobile-navbar__dropdown {
    max-height: 500px;
  }

  .mobile-navbar__dropdown-item {
    margin: 0;
    padding: 0;
  }

  /* Переиспользуем стандартный dropdown-стиль */
  .mobile-navbar__dropdown-link {
    display: block;
    padding: 10px;
    color: var(--color-text-default);
    text-decoration: none;
    border-radius: 10px;
    transition:
      color 0.3s ease-in-out,
      background-color 0.3s ease-in-out;
  }

  .mobile-navbar__dropdown-link:hover {
    color: var(--color-accent-blue);
    background-color: var(--background-color-light-blue);
  }

  .mobile-navbar__contacts {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
    padding: 15px;
    border-radius: 10px;
    background: linear-gradient(
      90deg,
      rgba(var(--background-color-for-gradient-blue-rgb), 0.55) 0%,
      rgba(244, 247, 250, 0.95) 100%
    );
  }

  .mobile-navbar__phone {
    text-decoration: none;
    transition: color 0.3s ease-in-out;
  }

  .mobile-navbar__phone:hover {
    color: var(--color-accent-blue);
  }

  body.menu-open {
    overflow: hidden;
  }
}

@media (max-width: 767px) {
  .mobile-navbar {
    width: 540px;
  }
}

@media (max-width: 575px) {
  .header__container {
    min-height: 68px;
  }

  .header__logo {
    width: 44px;
    height: 44px;
  }

  .header__burger {
    width: 44px;
    height: 44px;
    border-radius: 10px;
  }

  .header__burger-line {
    left: 11px;
    width: 22px;
  }

  .header__burger-line:nth-child(1) {
    top: 14px;
  }

  .header__burger-line:nth-child(2) {
    top: 21px;
  }

  .header__burger-line:nth-child(3) {
    top: 28px;
  }

  .header__burger.is-active .header__burger-line:nth-child(1) {
    top: 21px;
  }

  .header__burger.is-active .header__burger-line:nth-child(3) {
    top: 21px;
  }

  .header__mobile-menu {
    top: 68px;
  }

  .header__mobile-menu.is-open {
    max-height: calc(100vh - 68px);
  }

  .mobile-navbar {
    width: 100%;
    box-sizing: border-box;
    padding: 15px;
  }

  .mobile-navbar__link {
    padding: 10px;
    border-radius: 10px;
  }

  .mobile-navbar__dropdown-link {
    padding: 10px;
    border-radius: 10px;
  }

  .mobile-navbar__contacts {
    padding: 20px 18px;
    border-radius: 10px;
  }
}

@media (max-width: 389px) {
  .header__brand {
    gap: 10px;
  }
}