#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--oracle-color-page);
}

.nav-bar {
  border-bottom: var(--oracle-border-width) solid var(--oracle-color-cloud);
}

.nav-hairline {
  height: 1px;
  background: var(--oracle-color-sky);
  opacity: 0.6;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--oracle-space-s3);
}

.wordmark {
  font-family:    var(--oracle-font-display);
  font-size:      var(--oracle-size-label);
  font-weight:    600;
  letter-spacing: var(--oracle-tracking-wordmark);
  text-transform: uppercase;
  color:          var(--oracle-color-ink);
  text-decoration: none;
  flex-shrink:    0;
}

.nav-links {
  display: flex;
  gap:        var(--oracle-space-s4);
  list-style: none;
}

.nav-links a {
  font-family:    var(--oracle-font-mono);
  font-size:      var(--oracle-size-caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color:          var(--oracle-color-ink-muted);
  text-decoration: none;
  transition: color var(--oracle-motion-duration-fast) var(--oracle-motion-easing);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--oracle-color-ink);
}

.nav-toggle {
  display:        none;   
  font-family:    var(--oracle-font-mono);
  font-size:      var(--oracle-size-caption);
  font-weight:    500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color:          var(--oracle-color-ink);
  background:     none;
  border:         none;
  cursor:         pointer;
  padding:        var(--oracle-space-s1) 0;
  min-height:     44px;   
  min-width:      44px;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--oracle-color-page);
  display: flex;
  flex-direction: column;
  
  opacity: 0;
  transform: translateY(-8px);
  transition:
    opacity  var(--oracle-motion-duration-standard) var(--oracle-motion-easing),
    transform var(--oracle-motion-duration-standard) var(--oracle-motion-easing);
}

.nav-overlay[hidden] {
  display: none;
}

.nav-overlay[data-open] {
  opacity: 1;
  transform: translateY(0);
}

.nav-overlay-header {
  flex-shrink: 0;
}

.nav-overlay-inner {
  display:        flex;
  flex-direction: column;
  align-items:    flex-start;
  padding:        var(--oracle-space-s5);
  padding-top:    var(--oracle-space-s4);
  flex: 1;
}

.nav-close {
  font-family:    var(--oracle-font-mono);
  font-size:      var(--oracle-size-caption);
  font-weight:    500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color:          var(--oracle-color-ink-muted);
  background:     none;
  border:         none;
  cursor:         pointer;
  padding:        var(--oracle-space-s1) 0;
  min-height:     44px;
  min-width:      44px;
  transition: color var(--oracle-motion-duration-fast) var(--oracle-motion-easing);
}

.nav-close:hover {
  color: var(--oracle-color-ink);
}

.nav-overlay-links {
  list-style:     none;
  display:        flex;
  flex-direction: column;
  gap:            var(--oracle-space-s6);
  width:          100%;
}

.nav-overlay-links a {
  font-family:    var(--oracle-font-display);
  font-size:      var(--oracle-size-h2);
  font-weight:    400;
  letter-spacing: var(--oracle-tracking-h2);
  line-height:    var(--oracle-lh-h2);
  color:          var(--oracle-color-ink);
  text-decoration: none;
  display:        block;
  transition: color var(--oracle-motion-duration-fast) var(--oracle-motion-easing);
}

.nav-overlay-links a:hover {
  color: var(--oracle-color-sky);
}

.nav-overlay-links a[aria-current="page"] {
  color: var(--oracle-color-sky);
}

@media (max-width: 1023px) and (min-width: 648px) {
  .nav-links {
    gap: var(--oracle-space-s3);
  }
}

@media (max-width: 647px) {
  .nav-links {
    display: none;  
  }

  .nav-toggle {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-overlay {
    transition: none;
  }
}