/* ==========================================================================
   Header Block (BEM: header__element--modifier)
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid rgba(169, 185, 182, 0.1);
}

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

.header__logo {
  display: inline-flex;
  flex-shrink: 0;
}

.header__nav {
  display: none;
}

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

.header__nav-link {
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  padding: 0.5rem 0;
  position: relative;
}

.header__nav-link:hover,
.header__nav-link:focus-visible {
  color: var(--color-heading-accent);
}

.header__nav-link--active {
  color: var(--color-heading-accent);
}

.header__nav-link--active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-heading-accent);
  border-radius: 2px;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.header__login {
  display: none;
  padding: 0.6rem 1.25rem;
  font-size: var(--font-size-small);
}

.header__register {
  display: none;
  padding: 0.6rem 1.25rem;
  font-size: var(--font-size-small);
}

.header__flag {
  display: none;
  align-items: center;
  gap: 0.4rem;
}

.header__flag-icon {
  display: inline-flex;
  border-radius: 3px;
  overflow: hidden;
  line-height: 0;
}

.header__flag-code {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-main);
  letter-spacing: 0.03em;
}

.header__burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  border-radius: var(--radius-input);
  order: 2;
}

.header__burger:hover {
  background: rgba(155, 232, 106, 0.08);
}

.header__burger-line {
  display: block;
  width: 100%;
  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 {
  border-top: 1px solid rgba(169, 185, 182, 0.1);
  background: var(--color-bg-primary);
}

.header__mobile-menu[hidden] {
  display: none;
}

.header__mobile-list {
  display: grid;
  gap: 0.25rem;
  padding: 1rem var(--container-padding-inline) 1.5rem;
}

.header__mobile-link {
  display: block;
  padding: 0.85rem 0.25rem;
  font-weight: var(--font-weight-medium);
  border-bottom: 1px solid rgba(169, 185, 182, 0.08);
}

.header__mobile-link--active {
  color: var(--color-heading-accent);
}

.header__mobile-item--actions {
  display: grid;
  gap: 0.75rem;
  padding-top: 1rem;
}

/* Tablet / Desktop */
@media (min-width: 768px) {
  .header__nav {
    display: block;
  }

  .header__login,
  .header__register {
    display: inline-flex;
  }

  .header__flag {
    display: inline-flex;
  }

  .header__burger {
    display: none;
  }
}