.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.site-header.is-scrolled,
.site-header.is-mega-open {
  box-shadow: 0 10px 28px rgba(16, 17, 20, 0.08);
  border-color: rgba(224, 224, 224, 0.92);
}

.site-header__inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  position: relative;
  z-index: 2;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  min-width: 0;
}

.site-brand__logo-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  line-height: 0;
}

.site-brand__logo {
  display: block;
  height: 44px;
  width: auto;
  object-fit: contain;
}

.site-brand__title {
  font-size: 30px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  line-height: 1;
  white-space: nowrap;
}

.site-header__nav-wrap {
  display: flex;
  align-items: center;
  gap: 52px;
  margin-left: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 56px;
}

.site-nav__item {
  position: relative;
  display: flex;
  align-items: center;
  padding: 13px 0;
}

.site-nav__link {
  position: relative;
  font-size: 18px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 8px 0;
  transition: color 0.25s ease, transform 0.25s ease;
  white-space: nowrap;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  background: #2d63ff;
  transition: transform 0.25s ease;
}

.site-nav__link:hover,
.site-nav__link.is-active,
.site-nav__link.is-current-page,
.site-nav__item.is-open > .site-nav__link {
  color: var(--color-primary);
}

.site-nav__link:hover {
  transform: translateY(-1px);
}

.site-nav__link:hover::after,
.site-nav__link.is-active::after,
.site-nav__link.is-current-page::after,
.site-nav__item.is-open > .site-nav__link::after {
  transform: scaleX(1);
}

/* When a top navigation tab is being hovered/opened, show only that tab's blue
   underline instead of keeping both the current-page underline and hover underline. */
.site-header.is-mega-open .site-nav__link.is-current-page::after {
  transform: scaleX(0);
}

.site-header.is-mega-open .site-nav__item.is-open > .site-nav__link::after {
  transform: scaleX(1);
}

.site-mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  height: 430px;
  background: #ffffff;
  border: none;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  z-index: 1;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0), 0 14px 28px rgba(16, 17, 20, 0.05);
}

.site-header.is-mega-open .site-mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.site-mega-menu__container {
  position: relative;
  height: 100%;
}

.site-mega-menu__content {
  position: absolute;
  top: 14px;
  left: 50%;
  width: 300px;
  max-width: 300px;
  transform: translateX(-50%);
  transition: left 0.28s ease, opacity 0.22s ease, transform 0.22s ease;
}

.site-mega-menu__column {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.site-mega-menu__title {
  display: none;
}

.site-mega-menu__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding-top: 0;
}

.site-mega-menu__link {
  font-size: 18px;
  font-weight: 500;
  color: #8c9098;
  line-height: 1.35;
  transition: color 0.25s ease, transform 0.25s ease;
  white-space: nowrap;
}

.site-mega-menu__link:hover {
  color: var(--color-primary);
  transform: translateY(-1px);
}

.site-nav__mobile-dropdown {
  display: none;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-secondary);
  font-size: 15px;
  white-space: nowrap;
}

.lang-switch__link {
  transition: color var(--transition-base);
}

.lang-switch__link:hover,
.lang-switch__link.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.lang-switch__sep {
  color: #c0bbb0;
}

.site-header__toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-line);
}

@media (max-width: 1279px) {
  .site-brand__logo {
    height: 40px;
  }

  .site-brand__title {
    font-size: 26px;
  }

  .site-header__nav-wrap {
    gap: 34px;
  }

  .site-nav {
    gap: 38px;
  }

  .site-nav__link {
    font-size: 16px;
  }

  .site-mega-menu {
    height: 390px;
  }

  .site-mega-menu__content {
    width: 250px;
    max-width: 250px;
    top: 12px;
  }

  .site-mega-menu__links {
    gap: 20px;
  }
}

@media (max-width: 991px) {
  .site-brand {
    gap: 10px;
  }

  .site-brand__logo {
    height: 34px;
  }

  .site-brand__title {
    font-size: 20px;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-mega-menu {
    display: none;
  }

  .site-header__nav-wrap {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 16px 40px rgba(16, 17, 20, 0.08);
  }

  .site-header.is-open .site-header__nav-wrap {
    display: flex;
  }

  .site-nav {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .site-nav__item {
    width: 100%;
    display: block;
    padding: 0;
    border-bottom: 1px solid rgba(222, 214, 201, 0.65);
  }

  .site-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 16px 0;
  }

  .site-nav__mobile-dropdown {
    display: none;
    padding: 0 0 14px 0;
  }

  .site-nav__mobile-dropdown-inner {
    display: grid;
    gap: 12px;
    padding-left: 12px;
  }

  .site-nav__mobile-dropdown-link {
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.45;
  }

  .site-nav__item.is-open .site-nav__mobile-dropdown {
    display: block;
  }
}

@media (max-width: 575px) {
  .site-brand__logo {
    height: 30px;
  }

  .site-brand__title {
    font-size: 16px;
  }
}

/* Hover override: when the cursor is on any top navigation item,
   only the hovered/open item keeps the blue underline. */
.site-nav:has(.site-nav__link:hover) .site-nav__link.is-current-page:not(:hover)::after {
  transform: scaleX(0);
}

.site-nav:has(.site-nav__link:hover) .site-nav__link.is-current-page:not(:hover) {
  color: var(--color-primary);
}

/* 2026 visual refresh: premium glass navigation. */
.site-header {
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: rgba(233, 228, 218, 0.72);
}

.site-header.is-scrolled,
.site-header.is-mega-open {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 52px rgba(17, 24, 39, 0.09);
}

.site-brand__logo-wrap {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(255,255,255,0.92), rgba(244,234,219,0.7));
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.9), 0 12px 26px rgba(17,24,39,0.08);
}

.site-brand__title {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-nav {
  gap: clamp(28px, 3vw, 50px);
}

.site-nav__link {
  padding: 10px 0;
}

.site-nav__link::after {
  height: 3px;
  bottom: -8px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-blue), var(--color-accent));
}

.site-mega-menu {
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  box-shadow: 0 26px 70px rgba(17, 24, 39, 0.10);
}

.site-mega-menu__link {
  padding: 8px 14px;
  border-radius: 999px;
}

.site-mega-menu__link:hover {
  background: rgba(40, 92, 255, 0.07);
}

.lang-switch {
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid rgba(17,24,39,0.08);
  border-radius: 999px;
  background: rgba(255,255,255,0.58);
}

.site-header__toggle {
  background: rgba(255,255,255,0.72);
  box-shadow: 0 10px 24px rgba(17,24,39,0.08);
}

@media (max-width: 991px) {
  .site-header__nav-wrap {
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(233, 228, 218, 0.9);
    box-shadow: 0 24px 64px rgba(17, 24, 39, 0.14);
  }

  .site-brand__logo-wrap {
    width: 42px;
    height: 42px;
    border-radius: 14px;
  }
}