/* Header-specific styles for KO-REK */

.site-header {
  z-index: 40;
}

.site-logo {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(circle at 20% 0, rgba(14, 165, 233, 0.4), #020617);
  box-shadow: var(--shadow-xs);
}

.site-logo__mark {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.site-logo__dot {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  right: 3px;
  bottom: 3px;
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.site-title {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.site-title__sub {
  font-size: var(--text-xs);
  text-transform: none;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

/* Primary navigation layout */

.primary-nav {
  display: flex;
  align-items: center;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-24);
  list-style: none;
}

.primary-nav__link {
  position: relative;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: 0.25rem 0;
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-strong));
  transition: width var(--transition-base);
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--gray-50);
}

.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after {
  width: 100%;
}

.primary-nav__item--cta {
  margin-left: var(--space-16);
}

.primary-nav__cta {
  font-size: var(--text-sm);
}

/* Mobile nav toggle */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background-color: rgba(15, 23, 42, 0.9);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-toggle__bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-200);
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  width: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* Responsive behavior */

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    position: absolute;
    inset: 100% 0 auto 0;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), #020617);
    border-bottom: 1px solid rgba(148, 163, 184, 0.3);
    transform-origin: top;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-16) var(--space-16) var(--space-20);
  }

  .primary-nav__item {
    width: 100%;
  }

  .primary-nav__link {
    display: block;
    width: 100%;
    padding: 0.55rem 0;
  }

  .primary-nav__item--cta {
    width: 100%;
    margin-left: 0;
    margin-top: var(--space-12);
  }

  .primary-nav__cta {
    width: 100%;
    justify-content: center;
  }

  /* Hidden by default when JS is enabled; visible by default without JS */
  .primary-nav {
    display: block;
  }

  .js nav.primary-nav {
    display: none;
  }

  .js .primary-nav.is-open {
    display: block;
  }
}

@media (min-width: 769px) {
  .primary-nav {
    position: static;
  }
}