/* Header block (BEM: header) */
.header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--color-bg-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.9rem;
}

.header__logo img { height: 2.25rem; width: auto; }

.header__nav { display: none; }
.header__nav-list { display: flex; align-items: center; gap: 1.75rem; }
.header__nav-link {
  color: var(--color-text);
  font-weight: var(--fw-medium);
  font-size: 0.9375rem;
  transition: color var(--transition);
}
.header__nav-link:hover,
.header__nav-link--active { color: var(--color-heading-accent); }

.header__actions { display: flex; align-items: center; gap: 0.6rem; }
.header__login { display: none; }
.header__registration { display: none; }
.header__flag { display: none; font-size: 1.4rem; line-height: 1; }

.btn--sm { padding: 0.55rem 1.1rem; font-size: 0.875rem; }

.header__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
}
.header__burger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.header__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.header__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.header__mobile-menu {
  position: fixed;
  inset: 0;
  top: 4.2rem;
  background: var(--color-bg-primary);
  padding: 1.5rem var(--container-pad) 2rem;
  overflow-y: auto;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--transition), visibility var(--transition);
  z-index: 850;
}
.header__mobile-menu.is-open { transform: translateX(0); visibility: visible; }

.header__mobile-cta { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.5rem; }

.header__mobile-list { display: flex; flex-direction: column; gap: 0.25rem; }
.header__mobile-link {
  display: block;
  padding: 0.9rem 0.25rem;
  color: var(--color-white);
  font-weight: var(--fw-medium);
  font-size: 1.0625rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.header__mobile-link--active,
.header__mobile-link:hover { color: var(--color-heading-accent); }

@media (min-width: 768px) {
  .header__login,
  .header__registration,
  .header__flag { display: inline-flex; }
}

@media (min-width: 1024px) {
  .header__nav { display: block; }
  .header__burger { display: none; }
  .header__mobile-menu { display: none; }
}