/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-parchment);
  border-bottom: 1px solid var(--color-heather);
}

.site-header--hero {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background: transparent;
  border-bottom: none;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--width-content);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.site-header__logo {
  width: 40px;
  height: auto;
}

.site-header__wordmark {
  font-family: var(--font-wordmark);
  font-size: 2rem;
  color: var(--color-aubergine);
  line-height: 1;
}

.site-header--hero .site-header__wordmark {
  color: var(--color-parchment);
}

/* ---- Navigation ---- */
.site-nav__list {
  display: flex;
  gap: var(--space-lg);
}

.site-nav__link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.0625rem;
  color: var(--color-aubergine);
  text-decoration: none;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-heather);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-header--hero .site-nav__link {
  color: var(--color-parchment);
}

.site-header--hero .site-nav__link::after {
  background-color: var(--color-amber);
}

/* Hamburger */
.site-nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  position: relative;
}

.site-nav__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-aubergine);
  margin: 5px auto;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.site-header--hero .site-nav__toggle-bar {
  background-color: var(--color-parchment);
}

.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
  .site-nav__toggle {
    display: block;
  }

  .site-nav__list {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-nightshade);
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-sm);
  }

  .site-nav__list--open {
    display: flex;
  }

  .site-nav__link {
    color: var(--color-parchment);
    padding: var(--space-sm) 0;
    font-size: 1.125rem;
  }

  .site-nav__link::after {
    display: none;
  }
}

/* ---- Main ---- */
.container {
  max-width: var(--width-content);
  margin: 0 auto;
  padding-inline: var(--space-lg);
}

.container--narrow {
  max-width: var(--width-narrow);
}

.section {
  padding-block: var(--space-3xl);
}

.section--dark {
  background-color: var(--color-nightshade);
  color: var(--color-parchment);
}

/* ---- Two-column layout ---- */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .two-col {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }
}

/* ---- Page header ---- */
.page-header {
  text-align: center;
  padding-block: var(--space-3xl) var(--space-xl);
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-header__rule {
  width: 80px;
  height: 2px;
  background-color: var(--color-amber);
  margin: var(--space-md) auto 0;
  border: none;
}

/* ---- Footer ---- */
.site-footer {
  background-color: var(--color-nightshade);
  color: var(--color-parchment);
  padding-block: var(--space-3xl) var(--space-xl);
  text-align: center;
}

.site-footer__brand {
  margin-bottom: var(--space-lg);
}

.site-footer__logo {
  width: 60px;
  margin: 0 auto var(--space-sm);
  filter: brightness(0) invert(1) sepia(1) saturate(0.2) hue-rotate(260deg) brightness(1.6);
}

.site-footer__wordmark {
  font-family: var(--font-wordmark);
  font-size: 2.5rem;
  color: var(--color-parchment);
}

.site-footer__tagline {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-heather);
  margin-top: var(--space-xs);
}

.site-footer__nav {
  margin-top: var(--space-lg);
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.site-footer__nav a {
  font-family: var(--font-display);
  color: var(--color-heather);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer__nav a:hover {
  color: var(--color-parchment);
}

.site-footer__copy {
  margin-top: var(--space-xl);
  font-size: 0.8125rem;
  color: var(--color-heather);
  opacity: 0.7;
}