.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg-base) 78%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, background 0.25s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border-subtle);
  background: color-mix(in srgb, var(--bg-base) 92%, transparent);
}

.site-header__inner {
  width: min(100% - 2rem, var(--content-max));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  z-index: 2;
}

.logo img {
  height: 64px;
  width: auto;
}

.logo span {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.01em;
}

.site-footer .logo img {
  height: 48px;
}

.nav {
  display: none;
  gap: var(--space-5);
  font-size: var(--text-small);
  color: var(--text-secondary);
}

.nav a:hover {
  color: var(--text-primary);
}

.nav-toggle {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  z-index: 2;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: transform 0.25s;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

.site-header.is-open .nav-toggle span {
  background: transparent;
}

.site-header.is-open .nav-toggle span::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header.is-open .nav-toggle span::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (min-width: 900px) {
  .nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }
}

@media (max-width: 899px) {
  .nav {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    /* fully transparent/de-blurred when closed */
    background: transparent;
    -webkit-backdrop-filter: blur(0);
    backdrop-filter: blur(0);
    opacity: 0;
    pointer-events: none;
    transition: background 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
    font-size: 1.5rem;
    font-family: var(--font-display);
    color: var(--text-secondary);
  }

  .nav a {
    transition: color 0.2s;
  }

  .nav a:hover {
    color: var(--text-primary);
  }

  .site-header.is-open .nav {
    /* semi-transparent black backdrop (~50%) + blur, only while open.
       Use rgba() for universal browser/webview support (oklch() can be
       unsupported and silently render no background). */
    background: rgba(0, 0, 0, 0.5);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    opacity: 1;
    pointer-events: auto;
    z-index: 3;
  }

  .site-header.is-open .nav-toggle {
    z-index: 4;
  }
}

.wrap {
  width: min(100% - 2rem, var(--content-max));
  margin-inline: auto;
}

.section {
  padding-block: var(--section-pad-y);
  position: relative;
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-7);
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding-block: var(--space-7);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-5);
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--text-secondary);
  font-size: var(--text-small);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--text-muted);
  font-size: var(--text-micro);
}

.footer-brand a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-secondary);
}

.footer-brand img {
  width: 20px;
  height: 20px;
  border-radius: 4px;
}

.footer-brand a:hover {
  color: var(--text-primary);
}

@media (min-width: 900px) {
  .site-footer__inner {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}