.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: var(--nav-h);
}

.nav__mark {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem .35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__list a {
  display: block;
  position: relative;
  padding: .4rem .75rem;
  border-radius: var(--r-sm);
  color: var(--muted);
  font-size: var(--s-1);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease);
}

.nav__list a:hover {
  color: var(--ink);
  background: var(--blue-tint);
}

.nav__list a[aria-current="true"] {
  color: var(--ink);
}

.nav__list a[aria-current="true"]::after {
  content: "";
  position: absolute;
  left: .35rem;
  right: .35rem;
  bottom: -2px;
  height: 2px;
  background: var(--blue);
}

html {
  scroll-padding-top: var(--nav-h);
}

@media (max-width: 640px) {
  .nav__list {
    font-size: var(--s-1);
    gap: .25rem .9rem;
  }

  .nav__mark {
    display: none;
  }
}

.nav__theme {
  margin-left: auto;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--muted);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease);
}

.nav__theme:hover {
  color: var(--ink);
  background: var(--blue-tint);
}

.nav__moon {
  display: none;
}

:root[data-theme="dark"] .nav__sun {
  display: none;
}

:root[data-theme="dark"] .nav__moon {
  display: block;
}