/* Project navigation shares the same type, height, spacing, and state tokens. */
.project-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  color: var(--fg);
  font-family: var(--sans);
  transition: background-color 350ms ease, border-color 350ms ease;
}

.project-header::after {
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: var(--line);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 500ms var(--nav-ease);
}

.project-header.is-scrolled {
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.project-header.is-scrolled::after {
  transform: scaleX(1);
}

.project-header__inner {
  min-height: var(--nav-height);
  padding-inline: var(--pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
}

.project-header__identity {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: .75rem;
  justify-self: start;
}

.project-header__identity span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: var(--nav-index);
}

.project-header__identity strong {
  font-size: var(--nav-identity);
  font-weight: 600;
  letter-spacing: -.015em;
}

.project-header__nav {
  justify-self: center;
  display: flex;
  gap: clamp(1rem, 2vw, 2rem);
}

.project-header__nav a,
.project-header__back {
  position: relative;
  padding-block: .5rem;
  color: var(--muted);
  font-size: var(--nav-text);
  font-weight: 550;
  letter-spacing: -.01em;
  transition: color 180ms ease;
}

.project-header__nav a::after,
.project-header__back::after {
  position: absolute;
  inset: auto 0 .25rem;
  height: 1px;
  background: currentColor;
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 300ms var(--nav-ease);
}

.project-header__nav a:hover,
.project-header__nav a:focus-visible,
.project-header__back:hover,
.project-header__back:focus-visible {
  color: var(--fg);
}

.project-header__nav a:hover::after,
.project-header__nav a:focus-visible::after,
.project-header__back:hover::after,
.project-header__back:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.project-header__back {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: .65rem;
}

@media (max-width: 900px) {
  .project-header__inner {
    min-height: var(--nav-height-compact);
    grid-template-columns: 1fr auto;
  }
  .project-header__nav { display: none; }
}

@media (max-width: 700px) {
  .project-header__identity strong { font-size: var(--nav-identity-compact); }
}

@media (max-width: 430px) {
  .project-header__inner { gap: 1rem; }
  .project-header__identity { gap: .5rem; }
  .project-header__identity span { font-size: var(--nav-index-compact); }
  .project-header__back { font-size: var(--nav-back-compact); }
}