.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: transparent;
  transition: background 180ms ease, border-color 180ms ease;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 120ms;
  animation-timing-function: cubic-bezier(0.76, 0, 0.24, 1);
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  animation-name: none;
}

::view-transition-new(root) {
  animation-name: theme-reveal;
  clip-path: inset(0 100% 0 0);
}

@keyframes theme-reveal {
  to {
    clip-path: inset(0 0 0 0);
  }
}

.site-nav .nav {
  position: relative;
  width: calc(100% - 32px);
  height: 62px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  transition: width 220ms ease, height 220ms ease, gap 220ms ease;
}

.site-nav .nav-search {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(36vw, 420px);
  transform: translate(-50%, -50%);
}

.site-nav .nav-search input {
  width: 100%;
  height: 36px;
  border: 1px solid color-mix(in srgb, var(--line-soft, rgba(255, 255, 255, 0.12)) 80%, transparent);
  border-radius: 10px;
  padding: 0 13px;
  background: color-mix(in srgb, var(--bg, #030303) 36%, transparent);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  outline: none;
  backdrop-filter: blur(5px);
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.site-nav .nav-search input::placeholder {
  color: var(--faint);
}

.site-nav .nav-search input:focus {
  border-color: color-mix(in srgb, var(--brand-accent) 66%, var(--line, rgba(255, 255, 255, 0.16)));
  background: color-mix(in srgb, var(--bg, #030303) 50%, transparent);
  box-shadow: 0 14px 36px -26px var(--nav-item-shadow);
}

.site-nav .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 28px;
  font-size: 14px;
  font-weight: 650;
  transition: gap 220ms ease;
}

.site-nav .brand .brand-text {
  display: inline-block;
  max-width: 78px;
  white-space: nowrap;
  overflow: hidden;
  opacity: 1;
  transition: max-width 220ms ease, opacity 180ms ease;
}

.site-nav .brand-mark {
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  display: grid;
  place-items: center;
  color: var(--text);
}

.site-nav .brand-logo {
  width: 34px;
  height: 34px;
  display: block;
  overflow: visible;
}

.site-nav .brand-logo-q,
.site-nav .brand-logo-c {
  fill: currentColor;
  font-family: Inter, "Arial Black", Arial, sans-serif;
  font-size: 50px;
  font-weight: 900;
  line-height: 1;
}

.site-nav .brand-logo-c {
  fill: var(--brand-accent);
  font-size: 50px;
}

.site-nav .nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
  padding: 0;
  border-radius: 12px;
  background: var(--nav-group-bg);
  overflow: visible;
  scrollbar-width: none;
}

.site-nav .nav-links::-webkit-scrollbar {
  display: none;
}

.site-nav .nav-links a,
.site-nav .theme-toggle {
  display: inline-flex;
  align-items: center;
  position: relative;
  flex: 0 0 auto;
  gap: 0;
  width: var(--item-width, 96px);
  height: 34px;
  min-width: 0;
  overflow: hidden;
  padding: 0 10px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--nav-button-text);
  font: inherit;
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  transition: width 220ms ease, gap 220ms ease, color 160ms ease, background 160ms ease;
}

.site-nav .nav-links > :nth-child(1) {
  --item-width: 72px;
  --label-width: 36px;
}

.site-nav .nav-links > :nth-child(2) {
  --item-width: 76px;
  --label-width: 40px;
}

.site-nav .nav-links svg,
.site-nav .theme-toggle svg {
  position: absolute;
  left: 10px;
  top: calc((34px - 15px) / 2);
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  stroke-width: 1.8;
}

.site-nav .nav-links svg.fill-icon path {
  fill: currentColor;
}

.site-nav .nav-label {
  display: inline-block;
  overflow: hidden;
  max-width: var(--label-width, 72px);
  margin-left: 22px;
  white-space: nowrap;
  opacity: 1;
  transition: max-width 220ms ease, opacity 180ms ease;
}

.site-nav .nav-links a:hover,
.site-nav .nav-links a:focus-visible,
.site-nav .theme-toggle:hover,
.site-nav .theme-toggle:focus-visible {
  color: var(--text);
  background: var(--nav-item-hover);
  outline: none;
}

.site-nav.is-compact .nav {
  height: 48px;
  gap: 10px;
}

.site-nav.is-compact .brand {
  gap: 0;
}

.site-nav.is-compact .brand-text,
.site-nav.is-compact .nav-label {
  max-width: 0;
  opacity: 0;
}

.site-nav.is-compact .nav-links a,
.site-nav.is-compact .theme-toggle {
  width: 36px;
}

.mobile-back-top {
  display: none;
}

@media (max-width: 640px) {
  .site-nav {
    position: sticky;
  }

  .site-nav .nav {
    width: calc(100% - 24px);
    gap: 10px;
  }

  .site-nav .nav-search {
    position: static;
    flex: 1 1 140px;
    min-width: 0;
    width: auto;
    transform: none;
  }

  .site-nav .brand {
    gap: 0;
  }

  .site-nav .brand .brand-text,
  .site-nav .nav-label {
    max-width: 0;
    opacity: 0;
  }

  .site-nav .nav-links a,
  .site-nav .theme-toggle {
    width: 36px;
  }

  .mobile-back-top {
    position: fixed;
    top: 66px;
    left: 50%;
    z-index: 30;
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border: 1px solid color-mix(in srgb, var(--line-soft, rgba(255, 255, 255, 0.12)) 86%, transparent);
    border-radius: 50%;
    background: color-mix(in srgb, var(--bg, #030303) 78%, transparent);
    color: var(--nav-button-text);
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -8px);
    backdrop-filter: blur(8px);
    transition: opacity 160ms ease, transform 160ms ease, background 160ms ease, color 160ms ease;
  }

  .mobile-back-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
  }

  .mobile-back-top:hover,
  .mobile-back-top:focus-visible {
    color: var(--text);
    background: var(--nav-item-hover);
    outline: none;
  }

  .mobile-back-top svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
}

@media (max-width: 420px) {
  .site-nav .nav {
    width: calc(100% - 20px);
    gap: 8px;
  }

  .site-nav .brand-mark {
    width: 28px;
    height: 28px;
    flex-basis: 28px;
  }

  .site-nav .brand-logo {
    width: 32px;
    height: 32px;
  }
}