/* Header-specific styles building on base.css for Plzenova */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-background);
  border-bottom: var(--border-strong-thick);
}

.site-header__inner {
  padding-block: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: var(--border-strong-thick);
  background: var(--color-accent-lime);
  box-shadow: var(--shadow-hard-sm);
}

.site-header__brand::after {
  /* Disable global link underline animation for logo */
  display: none;
}

.site-header__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-none);
  border: var(--border-strong-thick);
  background: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--font-size-sm);
  font-weight: 800;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-header__title {
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.site-header__subtitle {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

/* Navigation */

.site-nav {
  position: fixed;
  inset-inline: 0;
  top: 64px;
  background: var(--color-background);
  border-top: var(--border-strong);
  border-bottom: var(--border-strong-thick);
  transform: translateY(-120%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
}

.site-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.site-nav__item a {
  display: block;
  padding: var(--space-4) var(--space-5);
  border-bottom: var(--border-strong);
  background: var(--color-surface);
  font-family: var(--font-display);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.site-nav__item a::after {
  bottom: 6px;
}

.site-nav__item a:hover,
.site-nav__item a:focus-visible {
  background: var(--color-primary);
}

/* Mobile burger */

.nav-toggle {
  margin-left: auto;
}

@media (min-width: 960px) {
  .site-header__inner {
    gap: var(--space-6);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    border: none;
    background: transparent;
  }

  .site-nav__list {
    flex-direction: row;
    gap: var(--space-3);
  }

  .site-nav__item a {
    border: var(--border-strong);
    background: var(--color-surface);
    padding-block: var(--space-2);
    padding-inline: var(--space-3);
  }
}

/* Utility state for when JS is disabled: header-nav is always visible via progressive enhancement */

.no-js .site-nav {
  position: static;
  transform: none;
  opacity: 1;
  visibility: visible;
  border: none;
}

.no-js .nav-toggle {
  display: none;
}