.altn-project-nav-shell {
  position: relative;
  z-index: 2;
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 48px 48px 72px;
  box-sizing: border-box;
}

.altn-project-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border, rgba(255, 255, 255, 0.12));
  font-family: var(--font-mono, monospace);
}

.altn-project-nav-link,
.altn-project-nav-back,
.altn-project-nav-empty {
  min-height: 72px;
  box-sizing: border-box;
}

.altn-project-nav-link,
.altn-project-nav-back {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  padding: 14px 16px;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.12));
  color: var(--text, #f1f3f2);
  text-decoration: none;
  background: var(--surface, rgba(255, 255, 255, 0.025));
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.altn-project-nav-link:hover,
.altn-project-nav-back:hover,
.altn-project-nav-link:focus-visible,
.altn-project-nav-back:focus-visible {
  color: var(--accent, #22f0a0);
  border-color: var(--accent, #22f0a0);
  background: rgba(34, 240, 160, 0.04);
}

.altn-project-nav-next {
  text-align: right;
  align-items: flex-end;
}

.altn-project-nav-label {
  color: var(--muted, #8b949d);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.altn-project-nav-title {
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.45;
}

.altn-project-nav-back {
  align-items: center;
  min-width: 150px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 13px;
}

.has-altn-project-nav .pw-next,
.has-altn-project-nav .fg-footer > a:first-child {
  display: none;
}

@media (max-width: 720px) {
  .altn-project-nav-shell {
    padding: 32px 16px 48px;
  }

  .altn-project-nav {
    grid-template-columns: 1fr 1fr;
  }

  .altn-project-nav-back {
    grid-column: 1 / -1;
    grid-row: 1;
    min-height: 52px;
  }

  .altn-project-nav-link,
  .altn-project-nav-empty {
    min-height: 88px;
  }

  .altn-project-nav-title { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .altn-project-nav-link,
  .altn-project-nav-back {
    transition: none;
  }
}