.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-cool-accent);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
}
.header__logo img { height: 36px; width: auto; }

.header__nav { display: none; }
.header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.header__nav-link {
  font-weight: var(--fw-medium);
  color: var(--color-text-main);
  transition: color var(--transition-base);
  padding-block: 0.4rem;
}
.header__nav-link:hover,
.header__nav-link--active {
  color: var(--color-heading-accent);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.header__login,
.header__register {
  display: none;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
}
.header__flag { display: none; align-items: center; gap: 0.4rem; }
.header__flag img { border-radius: 2px; line-height: 0; }
.header__flag-code {
  font-size: 0.8rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.03em;
  color: var(--color-text-main);
}

.header__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}
.header__burger span {
  display: block;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.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); }

.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: 65px;
  background: var(--color-bg-primary);
  z-index: var(--z-mobile-menu);
  overflow-y: auto;
  padding: 1.5rem var(--container-padding) 2rem;
}
.mobile-menu--open { display: block; }
.mobile-menu__list {
  display: grid;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}
.mobile-menu__link {
  display: block;
  padding: 0.9rem 0.25rem;
  font-size: 1.05rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-main);
  border-bottom: 1px solid var(--color-cool-accent);
}
.mobile-menu__link--active,
.mobile-menu__link:hover { color: var(--color-heading-accent); }
.mobile-menu__actions {
  display: grid;
  gap: 0.75rem;
}
.mobile-menu__actions .btn { width: 100%; }

@media (min-width: 768px) {
  .header__burger { display: none; }
  .mobile-menu { display: none !important; }
}

@media (min-width: 1024px) {
  .header__nav { display: block; }
  .header__login,
  .header__register { display: inline-flex; }
  .header__flag { display: flex; }
}