@layer header {
  .header {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    padding: 1.5em 0;
    transition: padding var(--transition), background var(--transition), backdrop-filter var(--transition);
    background: var(--header-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: var(--backdrop-blur-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 8px 8px 0 rgba(30, 30, 30, 0.25);
  }

  .header.is-scrolled {
    padding: 12px 0;
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--header-container);
    padding: 0 3em;
  }

  @media (max-width: 64em) {
    .header-inner {
      padding: 0 2em;
    }
  }

  @media (max-width: 48em) {
    .header-inner {
      padding: 0 1em;
    }
  }

  /* ========== Logo ========== */
  .header__logo {
    flex-shrink: 0;
    display: block;
    text-decoration: none;
  }

  .header__logo img {
    height: 56px;
    width: auto;
    display: block;
  }

  @media (max-width: 27.5em) {
    .header__logo img {
      height: 40px;
    }
  }

  /* ========== Desktop Nav ========== */
  .desktop-nav {
    display: flex;
    align-items: center;
    gap: 4px;
  }

  @media (max-width: 64em) {
    .desktop-nav {
      display: none;
    }
  }

  .nav-link {
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: var(--ui-text-size);
    font-weight: var(--ui-text-weight);
    color: var(--white);
    text-decoration: none;
    transition: color var(--transition);
    white-space: nowrap;
  }

  .nav-link:hover {
    color: rgba(255, 255, 255, 0.6);
  }

  /* ========== Desktop Dropdown ========== */
  .dropdown {
    position: relative;
  }

  .dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: var(--ui-text-size);
    font-weight: var(--ui-text-weight);
    color: var(--white);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: color var(--transition);
  }

  .dropdown-trigger:hover {
    color: rgba(255, 255, 255, 0.6);
  }

  .dropdown-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
  }

  .dropdown.is-open .dropdown-arrow {
    transform: rotate(180deg);
  }

  .dropdown-menu {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 4px;
    width: 320px;
    padding: 12px;
    border-radius: 12px;
    background: rgba(14, 14, 14, 0.5);
    backdrop-filter: var(--backdrop-blur-md);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  }

  .dropdown.is-open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .dropdown-item {
    display: block;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: var(--ui-text-dropdown);
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: background var(--transition);
  }

  .dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
  }

  /* ========== Mobile Burger ========== */
  .header__burger {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-btn);
    background: var(--white);
    border: none;
    cursor: pointer;
    transition: background-color var(--transition);
  }

  .header__burger:hover {
    background-color: #c7c7c7;
  }

  .header__burger svg {
    width: 20px;
    height: 20px;
  }

  @media (max-width: 64em) {
    .header__burger {
      display: flex;
    }
  }

  /* ========== Mobile Menu ========== */
  .header__overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
  }

  .header__overlay.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-menu {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 50;
    width: 300px;
    background: var(--primary);
    padding: 24px;
    transform: translateX(-100%);
    transition: transform var(--transition);
  }

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

  .mobile-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-btn);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    cursor: pointer;
    margin-bottom: 32px;
    transition: background var(--transition);
  }

  .mobile-close:hover {
    background: rgba(255, 255, 255, 0.15);
  }

  .mobile-close svg {
    width: 20px;
    height: 20px;
  }

  .mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .mobile-link {
    display: block;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: var(--ui-text-size);
    font-weight: var(--ui-text-weight);
    color: var(--white);
    text-decoration: none;
    transition: background var(--transition);
  }

  .mobile-link:hover {
    background: rgba(92, 179, 76, 0.1);
  }

  /* ========== Mobile Submenu (Услуги) ========== */
  .mobile-dropdown-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: var(--ui-text-size);
    font-weight: var(--ui-text-weight);
    color: var(--white);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: background var(--transition);
  }

  .mobile-dropdown-trigger:hover {
    background: rgba(92, 179, 76, 0.1);
  }

  .mobile-dropdown-arrow {
    width: 18px;
    height: 18px;
    transition: transform var(--transition);
    opacity: 0.5;
  }

  .mobile-dropdown.is-open .mobile-dropdown-arrow {
    transform: rotate(180deg);
    opacity: 1;
  }

  .mobile-submenu {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows var(--transition);
  }

  .mobile-dropdown.is-open .mobile-submenu {
    grid-template-rows: 1fr;
  }

  .mobile-submenu-inner {
    overflow: hidden;
  }

  .mobile-sublink {
    display: block;
    padding: 10px 16px 10px 32px;
    border-radius: 8px;
    font-size: var(--ui-text-dropdown);
    font-weight: var(--ui-text-weight);
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
  }

  .mobile-sublink:hover {
    background: rgba(92, 179, 76, 0.1);
    color: var(--white);
  }
}