.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 80px;
  padding: 1rem clamp(1.25rem, 4vw, 2rem);
  background: rgba(31, 31, 31, 0.82);
  border-bottom: 1px solid var(--rule);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  box-sizing: border-box;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}
.site-header-logo {
  display: block;
  width: 31.2px;
  height: 31.2px;
  object-fit: contain;
  transition: transform 180ms ease;
}
.site-header-logo:hover,
.site-header-logo:focus-visible { transform: scale(1.2); }
.site-header-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink-strong);
  font: 700 0.8rem var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-header-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  font: 0.75rem var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-header a { color: var(--ink-strong); text-decoration: none; }
.site-header-nav a:hover,
.site-header-nav a:focus-visible { color: var(--accent-text); }
.site-header-menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
}
.site-header-menu-toggle span {
  display: block;
  width: 21px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink-strong);
  transition: transform 180ms ease, opacity 180ms ease;
}
.site-header-menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(7px) rotate(45deg); }
.site-header-menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.site-header-menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-7px) rotate(-45deg); }
.site-header-menu-panel {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: grid;
  place-items: center;
  background: var(--bg-page);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease, visibility 180ms ease;
}
.site-header-menu-panel.is-open { opacity: 1; visibility: visible; }
.site-header-menu-links { display: grid; gap: 1.25rem; text-align: center; }
.site-header-menu-links a { font: 900 clamp(2.2rem, 9vw, 5rem)/0.9 var(--font-display); letter-spacing: -0.02em; }
body.site-menu-open { overflow: hidden; }
body.has-site-header { padding-top: 80px; }
@media (max-width: 720px) {
  .site-header { min-height: 64px; padding: 1rem 1.25rem; }
  .site-header-nav { display: none; }
  .site-header-menu-toggle { display: block; }
  body.has-site-header { padding-top: 64px; }
}