.topbar .brand {
  display: block;
  width: clamp(6.5rem, 10vw, 9rem);
}

.topbar .brand img,
.topbar .brand-logo {
  display: block;
  width: 100%;
  height: auto;
}

.topbar .nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.5rem);
  font-size: .68rem;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.topbar .nav a {
  color: var(--muted, #9a9993);
  transition: color .2s ease;
}

.topbar .nav a:hover,
.topbar .nav a:focus-visible { color: var(--paper, #f1efe8); }

.topbar .nav .join-link {
  color: var(--paper, #f1efe8);
  border-bottom: 1px solid currentColor;
  padding-bottom: .25rem;
}

.page-subnav {
  position: sticky;
  top: 5.25rem;
  z-index: 8;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.25rem, 3vw, 3rem);
  min-height: 2.9rem;
  padding: .72rem var(--pad, 1.25rem);
  overflow-x: auto;
  border-bottom: 1px solid var(--line, rgba(241, 239, 232, .16));
  background: rgba(8, 8, 8, .94);
  color: var(--muted, #9a9993);
  font: 650 .62rem/1.3 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .13em;
  text-transform: uppercase;
  backdrop-filter: blur(14px);
  scrollbar-width: none;
}

.page-subnav::-webkit-scrollbar { display: none; }

.page-subnav a {
  flex: 0 0 auto;
  white-space: nowrap;
  transition: color .2s ease;
}

.page-subnav a:hover,
.page-subnav a:focus-visible { color: var(--paper, #f1efe8); }

.page-subnav ~ main [id] { scroll-margin-top: 9rem; }

.footer-socials {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  margin-left: 1rem;
  vertical-align: middle;
}

.footer-socials a {
  display: inline-grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line, rgba(241, 239, 232, .16));
  color: var(--muted, #9a9993);
  transition: color .2s ease, border-color .2s ease, background .2s ease, transform .2s ease;
}

.footer-socials a:hover,
.footer-socials a:focus-visible {
  border-color: var(--signal, #ff4a30);
  background: var(--signal, #ff4a30);
  color: var(--black, var(--ink, #080808));
  transform: translateY(-2px);
}

.footer-socials a:focus-visible {
  outline: 2px solid var(--paper, #f1efe8);
  outline-offset: 2px;
}

.footer-socials svg {
  display: block;
  width: 1rem;
  height: 1rem;
}

.menu-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--line, rgba(241, 239, 232, .16));
  border-radius: 0;
  background: rgba(8, 8, 8, .72);
  color: var(--paper, #f1efe8);
  cursor: pointer;
}

.menu-toggle__icon {
  position: relative;
  display: block;
  width: 1.15rem;
  height: .8rem;
}

.menu-toggle__icon::before,
.menu-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: top .2s ease, transform .2s ease;
}

.menu-toggle__icon::before { top: .12rem; }
.menu-toggle__icon::after { top: .65rem; }

@media (max-width: 1050px) {
  body.menu-open { overflow: hidden; }

  .page-subnav {
    justify-content: flex-start;
    gap: 1.5rem;
  }

  .footer-socials {
    display: flex;
    width: 100%;
    margin: 1rem 0 0;
  }

  .topbar.menu-open {
    background: rgba(8, 8, 8, .97);
    border-color: var(--line, rgba(241, 239, 232, .16));
    backdrop-filter: blur(14px);
  }

  .menu-toggle {
    position: relative;
    z-index: 2;
    display: grid;
    place-items: center;
    flex: 0 0 auto;
  }

  .menu-toggle:focus-visible {
    outline: 2px solid var(--signal, #ff4a30);
    outline-offset: 3px;
  }

  .menu-toggle[aria-expanded="true"] .menu-toggle__icon::before {
    top: .38rem;
    transform: rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] .menu-toggle__icon::after {
    top: .38rem;
    transform: rotate(-45deg);
  }

  .topbar .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100svh - 5rem);
    padding: .4rem 0;
    overflow-y: auto;
    border-top: 1px solid var(--line, rgba(241, 239, 232, .16));
    border-bottom: 1px solid var(--line, rgba(241, 239, 232, .16));
    background: rgba(8, 8, 8, .97);
    box-shadow: 0 1.2rem 2.5rem rgba(0, 0, 0, .4);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-.5rem);
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  }

  .topbar .nav.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .topbar .nav a,
  .topbar .nav a:not(.back),
  .topbar .nav a:not(.back-link),
  .topbar .nav a:not(.join-link) {
    display: block !important;
    width: 100%;
    padding: 1rem var(--pad, 1.25rem);
    border: 0;
    border-bottom: 1px solid var(--line, rgba(241, 239, 232, .16));
    color: var(--muted, #9a9993);
  }

  .topbar .nav a:last-child { border-bottom: 0; }

  .topbar .nav .back,
  .topbar .nav .back-link,
  .topbar .nav .join-link {
    color: var(--paper, #f1efe8);
  }
}

/* Centered footer lockup: navigation, compact mark, socials, copyright. */
footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: clamp(3rem, 6vw, 4.5rem) var(--pad, 1.25rem) 2rem;
  border-top: 1px solid var(--line, rgba(241, 239, 232, .16));
  background: #080808;
  color: var(--muted, #9a9993);
  font-size: .64rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-align: center;
}

footer a:hover,
footer a:focus-visible {
  color: var(--paper, #f1efe8);
}

footer .footer-menu {
  max-width: 78rem;
  color: var(--muted, #9a9993);
  line-height: 2;
  text-align: center;
  text-wrap: balance;
}

footer .footer-logo-link {
  display: block;
  margin: 2rem auto 1.35rem;
  line-height: 0;
}

footer .footer-logo {
  display: block;
  width: clamp(4.75rem, 7vw, 5.75rem);
  height: auto;
  margin: 0;
}

footer .footer-socials {
  display: flex;
  align-items: center;
  justify-content: center;
  width: auto;
  margin: 0;
  gap: .55rem;
}

footer > .footer-copy {
  margin-top: 1.6rem;
  color: var(--muted, #9a9993);
  text-align: center;
}

@media (max-width: 760px) {
  footer {
    padding-top: 3rem;
    gap: 0;
  }

  footer .footer-menu { line-height: 2.15; }

  footer .footer-logo-link {
    margin-top: 1.75rem;
  }

  footer .footer-logo { width: 4.75rem; }

  footer .footer-socials {
    width: auto;
    margin: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .menu-toggle__icon::before,
  .menu-toggle__icon::after,
  .topbar .nav {
    transition-duration: .01ms !important;
  }
}

/* Light header theme - approved 2026-09-01. */
.topbar {
  background: #f1efe8;
  border-bottom-color: rgba(8, 8, 8, .14);
}

.topbar.scrolled {
  background: rgba(241, 239, 232, .96);
  border-color: rgba(8, 8, 8, .18);
  backdrop-filter: blur(12px);
}

.topbar .preview-badge {
  border-color: rgba(8, 8, 8, .2);
  color: #080808;
}

.topbar .nav a,
.topbar .nav .back,
.topbar .nav .back-link,
.topbar .nav .join-link {
  color: #080808;
}

.topbar .nav .join-link {
  border-bottom-color: #080808;
}

.topbar .nav a:hover,
.topbar .nav a:focus-visible {
  color: #ff4a30;
}

.menu-toggle {
  border-color: rgba(8, 8, 8, .2);
  background: #f1efe8;
  color: #080808;
}

@media (max-width: 1050px) {
  .topbar.menu-open {
    background: rgba(241, 239, 232, .98);
    border-color: rgba(8, 8, 8, .18);
  }

  .topbar .nav {
    border-color: rgba(8, 8, 8, .14);
    background: rgba(241, 239, 232, .98);
  }

  .topbar .nav a,
  .topbar .nav a:not(.back),
  .topbar .nav a:not(.back-link),
  .topbar .nav a:not(.join-link) {
    border-bottom-color: rgba(8, 8, 8, .14);
    color: #080808;
  }
}