:root {
  --sans: "Atkinson Hyperlegible", "Segoe UI", sans-serif;
  --mono: "Azeret Mono", "SFMono-Regular", "Cascadia Code", monospace;
  --header: 4rem;
  --site-width: 78rem;
}

.site-header,
.spec-header {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  height: var(--header);
  padding: 0;
  color: var(--color-text);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.spec-header {
  display: flex;
  padding-inline: clamp(1rem, 3vw, 2.25rem);
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-header__inner {
  display: flex;
  width: 100%;
  height: 100%;
  padding-inline: clamp(1rem, 3vw, 2.25rem);
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-brand,
.spec-brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.75rem;
}

.wordmark,
.landing-logo {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  font: 600 0.8125rem/1 var(--mono);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand-mark,
.mdbase-mark {
  display: block;
  width: 1.25rem;
  height: 1.25rem;
  overflow: visible;
}

.brand-mark--compact {
  width: 1.25rem;
  height: 1.25rem;
}

.brand-mark__ink,
.mdbase-mark-ink {
  fill: var(--color-text);
}

.brand-mark__accent,
.mdbase-mark-accent {
  fill: var(--color-accent);
}

.desktop-nav,
.landing-nav {
  display: flex;
  height: 100%;
  align-items: stretch;
  gap: 0;
}

.desktop-nav a,
.landing-nav a {
  position: relative;
  display: flex;
  padding: 0 0.75rem;
  align-items: center;
  color: var(--color-text-muted);
  font: 400 0.75rem/1 var(--sans);
  text-decoration: none;
}

.desktop-nav a::after,
.landing-nav a::after {
  position: absolute;
  right: 0.75rem;
  bottom: -1px;
  left: 0.75rem;
  height: 2px;
  content: "";
  background: transparent;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"],
.landing-nav a:hover,
.landing-nav a[aria-current="page"],
.landing-nav a.nav-active {
  color: var(--color-text);
}

.desktop-nav a[aria-current="page"]::after,
.landing-nav a[aria-current="page"]::after,
.landing-nav a.nav-active::after {
  background: var(--color-accent);
}

.header-actions,
.spec-header-actions {
  display: flex;
  height: 100%;
  margin-left: auto;
  align-items: center;
  gap: 0.35rem;
}

.scene-count {
  color: var(--color-text-muted);
  font: 500 0.625rem/1 var(--mono);
  white-space: nowrap;
}

.theme-menu {
  position: relative;
  flex: 0 0 auto;
}

.theme-menu > summary {
  display: grid;
  width: 2rem;
  height: 2rem;
  padding: 0;
  place-items: center;
  color: var(--color-text-faint);
  background: transparent;
  border: 0;
  border-radius: 3px;
  list-style: none;
  cursor: pointer;
}

.theme-menu > summary::-webkit-details-marker {
  display: none;
}

.theme-menu > summary:hover,
.theme-menu[open] > summary {
  color: var(--color-text);
  background: var(--color-surface-subtle);
}

.theme-menu > summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-menu__icon {
  display: block;
  width: 0.875rem;
  height: 0.875rem;
}

.theme-menu__icon circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.25;
}

.theme-menu__icon path {
  fill: currentColor;
}

.theme-menu__options {
  position: absolute;
  z-index: 110;
  top: calc(100% + 0.4rem);
  right: 0;
  display: grid;
  width: 7.5rem;
  padding: 0.3rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: 3px;
}

.theme-menu__options button {
  display: grid;
  width: 100%;
  min-height: 1.9rem;
  padding: 0 0.5rem;
  align-items: center;
  grid-template-columns: 1fr auto;
  color: var(--color-text-soft);
  background: transparent;
  border: 0;
  border-radius: 2px;
  font: 400 0.66rem/1 var(--mono);
  text-align: left;
  cursor: pointer;
}

.theme-menu__options button::after {
  width: 0.3rem;
  height: 0.3rem;
  content: "";
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0;
}

.theme-menu__options button:hover {
  color: var(--color-text);
  background: var(--color-surface-subtle);
}

.theme-menu__options button[aria-pressed="true"] {
  color: var(--color-text);
}

.theme-menu__options button[aria-pressed="true"]::after {
  opacity: 1;
}

.theme-menu__options button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.mobile-nav {
  position: relative;
  display: none;
}

.mobile-nav summary {
  padding: 0.35rem 0;
  color: var(--color-text-soft);
  font-size: 0.78rem;
  list-style: none;
  cursor: pointer;
}

.mobile-nav summary::-webkit-details-marker {
  display: none;
}

.mobile-nav nav {
  position: absolute;
  top: 2.15rem;
  right: 0;
  width: min(18rem, calc(100vw - 2rem));
  padding: 0.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
}

.mobile-nav nav a {
  display: block;
  padding: 0.7rem;
  color: var(--color-text);
  font-size: 0.82rem;
  text-decoration: none;
}

.mobile-nav nav a[aria-current="page"] {
  color: var(--color-accent-strong);
}

.site-footer {
  position: relative;
  z-index: 2;
  display: block;
  min-height: 0;
  margin-top: 5rem;
  padding: 0;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font: inherit;
}

.site-footer__inner {
  display: grid;
  width: min(100% - 2rem, var(--site-width));
  min-height: 5.5rem;
  margin-inline: auto;
  padding-block: 1.5rem;
  align-items: center;
  grid-template-columns: 1fr auto;
  gap: 2rem;
}

.site-footer strong {
  color: var(--color-text);
  font: 600 0.75rem/1 var(--mono);
}

.site-footer p {
  margin: 0.3rem 0 0;
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem 1.1rem;
}

.site-footer nav a {
  color: var(--color-text-soft);
  font-size: 0.75rem;
  text-decoration: none;
}

.site-footer nav a:hover {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 0.3rem;
}

@media (max-width: 60rem) {
  .desktop-nav,
  .landing-nav {
    display: none;
  }

  .mobile-nav {
    display: block;
  }
}

@media (max-width: 42rem) {
  .site-header__inner {
    padding-inline: 0.625rem;
  }

  .site-footer__inner {
    width: min(100% - 1.25rem, var(--site-width));
  }

  .scene-count {
    display: none;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .site-footer nav {
    justify-content: flex-start;
  }
}