.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(7, 15, 28, 0.97) 0%, rgba(7, 15, 28, 0.88) 100%);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1rem 1.25rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: 1rem 1.5rem;
  flex-wrap: wrap;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  text-decoration: none;
  color: inherit;
}

.site-header__brand:focus-visible {
  outline: 2px solid var(--color-text-on-dark);
  outline-offset: 4px;
}

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

.site-header__title {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-heading);
  font-size: 1.125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-on-dark);
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__right {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1.25rem 1.75rem;
  min-width: 0;
}

.lang-switcher--header {
  flex-shrink: 0;
}

.site-header__nav {
  display: flex;
  min-width: 0;
}

.site-header__nav ul {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.25rem 1.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav a {
  font-family: var(--font-body);
  font-weight: var(--font-weight-body-medium);
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition:
    color var(--transition-fast, 0.2s ease),
    background-color var(--transition-fast, 0.2s ease),
    border-color 0.15s ease;
}

.site-header__nav a:hover {
  color: var(--color-text-on-dark);
  background-color: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  padding-left: 0.65rem;
  padding-right: 0.65rem;
  margin-left: -0.65rem;
  margin-right: -0.65rem;
}

.site-header__nav a:focus-visible {
  outline: 2px solid var(--color-text-on-dark);
  outline-offset: 4px;
  border-radius: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 46px;
  padding: 0 1.5rem;
  font-family: var(--font-body);
  font-weight: var(--font-weight-body-semibold);
  font-size: 0.875rem;
  letter-spacing: 0.015em;
  text-decoration: none;
  border-radius: var(--radius-button);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--transition-fast, 0.2s ease),
    color var(--transition-fast, 0.2s ease),
    border-color var(--transition-fast, 0.2s ease),
    transform var(--transition-fast, 0.2s ease),
    box-shadow var(--transition-fast, 0.2s ease);
}

.btn__icon {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast, 0.2s ease);
}

.btn:hover .btn__icon {
  transform: translateX(3px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-blue-alt) 100%);
  color: var(--color-text-on-dark);
  box-shadow: 0 8px 24px rgba(11, 108, 255, 0.35);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-accent-blue-bright, #3d8cff) 0%, var(--color-accent-blue) 100%);
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(11, 108, 255, 0.42);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--primary:focus-visible {
  outline: 2px solid var(--color-text-on-dark);
  outline-offset: 3px;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-on-dark);
  border-color: var(--color-border-ghost);
}

.btn--ghost:hover {
  background-color: rgba(255, 255, 255, 0.12);
  border-color: var(--color-text-on-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

.btn--ghost:focus-visible {
  outline: 2px solid var(--color-text-on-dark);
  outline-offset: 3px;
}

.btn--accent-green {
  background-color: var(--color-accent-green);
  color: var(--color-text-on-dark);
}

.btn--accent-green:hover {
  background-color: var(--color-accent-green-alt);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(26, 157, 92, 0.38);
}

.btn--accent-green:focus-visible {
  outline: 2px solid var(--color-accent-green-alt);
  outline-offset: 3px;
}

/* Переключатель языка */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  gap: 0.15rem;
  padding: 0.2rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
}

.lang-switcher__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0.35rem 0.55rem;
  min-width: 2.25rem;
  line-height: 1;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: var(--font-weight-body-semibold);
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.72);
  background: transparent;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  transition:
    color var(--transition-fast, 0.2s ease),
    background-color var(--transition-fast, 0.2s ease);
}

.lang-switcher__btn:hover {
  color: var(--color-text-on-dark);
  background-color: rgba(255, 255, 255, 0.08);
}

.lang-switcher__btn.is-active {
  color: var(--color-text-on-dark);
  background: linear-gradient(135deg, rgba(11, 108, 255, 0.55) 0%, rgba(26, 157, 92, 0.35) 100%);
  box-shadow: 0 4px 12px rgba(11, 108, 255, 0.25);
}

.lang-switcher__btn:focus-visible {
  outline: 2px solid var(--color-text-on-dark);
  outline-offset: 2px;
}

/* Адаптив мобильной шапки полностью описан в polish.css (бургер + выпадающее меню) */

@media (max-width: 640px) {
  .site-header__inner {
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  .site-header__brand {
    gap: 0.55rem;
  }

  .site-header__logo {
    height: 36px;
  }

  .site-header__title {
    font-size: 0.95rem;
    letter-spacing: 0.1em;
  }
}

@media (max-width: 380px) {
  .site-header__title {
    font-size: 0.82rem;
    letter-spacing: 0.08em;
  }

  .site-header__logo {
    height: 32px;
  }
}