/*
MODULE: Site Navigation Styles
RESPONSIBILITY: Visual states for the fixed .site-nav block, including its
  compact (scrolled) state and the mobile menu.
DEPENDS ON: tokens.css, layout.css
EXPOSES: .site-nav and its elements/modifiers
*/

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
  padding-left: var(--content-gutter);
  padding-right: var(--content-gutter);
  background-color: transparent;
  border-bottom-width: var(--border-width-thin);
  border-bottom-style: solid;
  border-bottom-color: transparent;
  transition-property: padding-top, padding-bottom, background-color, border-bottom-color;
  transition-duration: var(--transition-duration-base);
  transition-timing-function: var(--transition-timing-standard);
}

.site-nav--scrolled {
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  background-color: rgba(17, 17, 17, 0.9);
  border-bottom-color: var(--color-border);
}

.site-nav__brand {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
}

.site-nav__toggle {
  display: block;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: var(--color-text);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  padding-left: var(--space-3);
}

.site-nav__list {
  display: none;
  flex-direction: column;
  row-gap: var(--space-5);
}

.site-nav__link {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: var(--color-muted);
  transition-property: color;
  transition-duration: var(--transition-duration-fast);
  transition-timing-function: var(--transition-timing-standard);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-accent);
}

.site-nav--open .site-nav__list {
  display: flex;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  padding-left: var(--content-gutter);
  padding-right: var(--content-gutter);
  background-color: var(--color-background);
  border-bottom-width: var(--border-width-thin);
  border-bottom-style: solid;
  border-bottom-color: var(--color-border);
}

@media (min-width: 768px) {
  .site-nav__toggle {
    display: none;
  }

  .site-nav__list {
    display: flex;
    flex-direction: row;
    column-gap: var(--space-6);
  }
}