/**
 * Header block (BEM)
 */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-bg-primary);
  box-shadow: var(--shadow-header);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.875rem;
}

.header__logo img { height: 2.125rem; width: auto; }

.header__nav { display: none; }

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.header__nav-item { position: relative; }

.header__nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
  padding-block: 0.5rem;
  transition: color var(--transition-fast);
}
.header__nav-link:hover,
.header__nav-item--active > .header__nav-link { color: var(--color-gold); }

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.header__btn-login,
.header__btn-register {
  display: none;
  padding: 0.625rem 1.125rem;
  font-size: var(--fs-small);
}

.header__flag {
  display: none;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}
.header__flag img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.header__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  z-index: var(--z-burger);
}
.header__burger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.header__burger[aria-expanded="true"] .header__burger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header__burger[aria-expanded="true"] .header__burger-line:nth-child(2) { opacity: 0; }
.header__burger[aria-expanded="true"] .header__burger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.header__mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: 4.25rem;
  background: var(--color-bg-primary);
  z-index: calc(var(--z-header) - 1);
  overflow-y: auto;
  padding: 1.5rem var(--container-padding) 2rem;
}
.header__mobile-menu.is-open { display: block; }

.header__mobile-list { display: flex; flex-direction: column; margin-bottom: 1.5rem; }
.header__mobile-link {
  display: block;
  padding: 0.875rem 0;
  font-size: 1rem;
  font-weight: var(--fw-medium);
  border-bottom: 1px solid var(--color-border);
}

.header__mobile-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

@media (min-width: 768px) {
  .header__nav { display: block; }
  .header__burger { display: none; }
  .header__mobile-menu,
  .header__mobile-menu.is-open { display: none; }
  .header__btn-login,
  .header__btn-register { display: inline-flex; }
  .header__flag { display: block; }
}