.site-header {
  position: sticky;
  isolation: isolate;
  z-index: 100;
  top: 0;
  width: 100%;
  border-bottom: 1px solid rgb(85 49 111 / 0.65);
  background: transparent;
}

.site-header::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: rgb(9 5 14 / 0.94);
  backdrop-filter: blur(14px);
  content: "";
  pointer-events: none;
}

.site-header__inner {
  display: flex;
  min-height: 4.75rem;
  align-items: center;
  gap: var(--space-5);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-opal-text);
  text-decoration: none;
}

.site-header__brand:hover { color: var(--color-focus-lilac); }

.site-header__mark {
  width: 2.375rem;
  height: 2.375rem;
  flex: 0 0 2.375rem;
  object-fit: contain;
}

.site-header__brand-text {
  overflow: hidden;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__nav {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
}

.site-header__nav-list {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  display: flex;
  min-width: 0;
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  position: relative;
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--color-opal-text);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__nav-list a::after {
  position: absolute;
  right: 0;
  bottom: 0.25rem;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--color-violet-signal);
  box-shadow: var(--shadow-glow);
  content: "";
  transition: transform var(--transition-fast);
}

.site-header__nav-list a:hover::after,
.site-header__nav-list a[aria-current="page"]::after { transform: scaleX(1); }
.site-header__nav-list a[aria-current="page"] { color: var(--color-violet-soft); }
.site-header__nav-cta { flex: 0 0 auto; white-space: nowrap; }

.site-header__toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  min-width: 2.75rem;
  padding: 0;
  border: 1px solid var(--border-signal);
  background: transparent;
  color: var(--color-opal-text);
}

.site-header__toggle:hover { background: rgb(157 78 221 / 0.14); color: var(--color-focus-lilac); }
.site-header__toggle-lines { display: grid; width: 1.25rem; gap: 0.25rem; }
.site-header__toggle-lines span { display: block; height: 1px; background: currentColor; transition: transform var(--transition-fast), opacity var(--transition-fast); }
.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(1) { transform: translateY(0.3125rem) rotate(45deg); }
.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(2) { opacity: 0; }
.site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(3) { transform: translateY(-0.3125rem) rotate(-45deg); }

@media (max-width: 68rem) {
  .site-header__inner { min-height: 4.25rem; justify-content: space-between; }
  .site-header__toggle { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; }
  .site-header__nav {
    position: fixed;
    z-index: 101;
    top: 4.25rem;
    right: 0;
    display: flex;
    width: min(100vw, 25rem);
    height: calc(100vh - 4.25rem);
    height: calc(100dvh - 4.25rem);
    min-height: 0;
    padding: var(--space-6) var(--container-padding-mobile);
    transform: translateX(100%);
    flex-direction: column;
    align-items: stretch;
    justify-content: space-between;
    overflow-y: auto;
    overscroll-behavior: contain;
    touch-action: pan-y;
    border-left: 1px solid var(--border-signal);
    background: var(--color-plum-panel);
    box-shadow: var(--shadow-floating);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-fast);
  }

  .site-header__nav.is-open { transform: translateX(0); opacity: 1; pointer-events: auto; }
  .site-header__nav-list { align-items: stretch; flex-direction: column; gap: var(--space-2); }
  .site-header__nav-list a { min-height: 3rem; justify-content: flex-start; font-size: var(--text-small); text-align: left; }
  .site-header__nav-list a::after { right: auto; width: 3rem; }
  .site-header__nav-cta { width: 100%; }
}

@media (max-width: 28rem) {
  .site-header__inner { gap: var(--space-3); }
  .site-header__mark { width: 2rem; height: 2rem; flex-basis: 2rem; }
  .site-header__brand { gap: var(--space-2); }
  .site-header__brand-text { font-size: 0.9375rem; letter-spacing: 0.06em; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-lines span,
  .site-header__nav-list a::after { transition: none; }
}