/* ==========================================================================
   Header block
   ========================================================================== */

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

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

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

.header__nav {
  display: none;
}

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

.header__nav-link {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  padding-block: 0.5rem;
  position: relative;
}

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

.header__nav-link--active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 2px;
  background: var(--color-heading-accent);
  border-radius: 2px;
}

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

.header__flag {
  display: none;
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  border: 1px solid var(--color-btn-secondary-border);
  border-radius: var(--radius-badge);
  padding: 0.3rem 0.5rem;
}

.header__login {
  display: none;
  padding: 0.7rem 1.25rem;
}

.header__register {
  padding: 0.7rem 1.25rem;
  font-size: 0.8125rem;
}

.header__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.3rem;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
}

.header__burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header__burger[aria-expanded="true"] .header__burger-line:nth-child(1) {
  transform: translateY(0.45rem) 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(-0.45rem) rotate(-45deg);
}

.header__mobile-menu {
  display: none;
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-card-bg);
}

.header__mobile-menu.is-open {
  display: block;
}

.header__mobile-list {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.75rem;
}

.header__mobile-link {
  display: block;
  padding: 0.85rem 0;
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-card-bg);
}

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

.header__mobile-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0 1.75rem 1.25rem;
}

/* Tablet / small desktop: show nav, hide login button still */
@media (min-width: 64em) {
  .header__nav { display: block; }
  .header__flag { display: inline-flex; align-items: center; }
  .header__login { display: inline-flex; }
  .header__burger { display: none; }
  .header__mobile-menu,
  .header__mobile-menu.is-open { display: none; }
}