.nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 45;
  width: 100%;
  padding: 1.15rem 1.5rem;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1rem;
  background: none;
  border: none;
}
.nav a,
.nav button {
  pointer-events: auto;
  color: inherit;
  text-decoration: none;
}
.mark {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-weight: 500;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  color: #111;
}
.mark img {
  display: block;
  width: 1.15rem;
  height: auto;
  background: transparent;
}
.nav-links {
  display: flex;
  gap: 1.15rem;
  margin-left: 0.4rem;
  pointer-events: auto;
}
.nav-links a {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #5c5c5c;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: #111; }
.theme {
  margin-left: auto;
  margin-right: 1.5rem;
  background: none;
  border: 1px solid rgba(17, 17, 17, 0.22);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #111;
  cursor: pointer;
  padding: 0.28rem 0.55rem;
}

@media (max-width: 860px) {
  .nav {
    flex-wrap: wrap;
    padding: 0.85rem 1.1rem 0.7rem;
    row-gap: 0.45rem;
  }
  .nav-links {
    order: 3;
    width: 100%;
    gap: 0.9rem;
  }
}