/* Navigation bar, hamburger icon, mobile menu, breadcrumbs */

/* ---- Site header (sticky, full-width) ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  border-block-end: 1px solid var(--color-border);
}

/* ---- Site nav container ---- */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
  height: var(--nav-height);
}

/* ---- Logo link ---- */
.site-nav__logo {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;

  &:hover {
    color: var(--color-accent);
  }
}

/* ---- Toggle button (hamburger, mobile only) ---- */
.site-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;

  &:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 4px;
  }
}

/* ---- Hamburger icon (3 lines via span + pseudo-elements) ---- */
.hamburger {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background var(--transition-fast);

  &::before,
  &::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition-fast);
  }

  &::before { top: -6px; }
  &::after { top: 6px; }
}

[aria-expanded="true"] .hamburger {
  background: transparent;

  &::before {
    top: 0;
    transform: rotate(45deg);
  }

  &::after {
    top: 0;
    transform: rotate(-45deg);
  }
}

/* ---- Nav list (hidden on mobile, flex-column when open) ---- */
.site-nav__list {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;

  &.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-block-end: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-2);
  }
}

/* ---- Nav links (with current-page styling) ---- */
.site-nav__link {
  display: block;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);

  &:hover {
    color: var(--color-text);
  }

  &[aria-current="page"] {
    color: var(--color-text);
    font-weight: 600;
  }

  &:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 4px;
  }
}

/* ---- Tablet+ breakpoint (horizontal nav, no hamburger) ---- */
@media (min-width: 48rem) {
  .site-nav__toggle {
    display: none;
  }

  .site-nav__list {
    display: flex;
    flex-direction: row;
    gap: var(--space-1);
  }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .hamburger,
  .hamburger::before,
  .hamburger::after {
    transition: none;
  }
}

/* ---- Breadcrumb styles ---- */
.breadcrumb {
  margin-block-end: var(--space-6);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.breadcrumb__item {
  display: flex;
  align-items: center;

  &:not(:last-child)::after {
    content: '/';
    margin-inline-start: var(--space-1);
    color: var(--color-border);
  }
}

.breadcrumb__link {
  color: var(--color-text-muted);
  text-decoration: none;

  &:hover {
    color: var(--color-accent);
    text-decoration: underline;
  }
}