.site-header {
  position: sticky;
  z-index: 8;
  inset-block-start: 0;
  padding-block: 0;
  border-bottom: var(--border-width) solid rgb(255 255 255 / 9%);
  background: rgb(7 16 20 / 94%);
  box-shadow: 0 0.35rem 1rem rgb(0 0 0 / 18%);
}

@supports (backdrop-filter: blur(0.75rem)) {
  .site-header {
    background: rgb(7 16 20 / 84%);
    backdrop-filter: blur(0.75rem);
  }
}

.navigation-shell {
  display: grid;
  min-height: 4.5rem;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
}

.brand {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  font-weight: 700;
  text-decoration: none;
}

.brand-logo {
  width: 2.5rem;
  height: 2.5rem;
  display: block;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.brand-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.menu-toggle {
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

.menu-icon,
.menu-icon span {
  display: block;
}

.menu-icon {
  width: 1.25rem;
}

.menu-icon span {
  height: 2px;
  margin-block: 0.25rem;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle[aria-expanded="true"] .menu-icon span:first-child {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-icon span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-icon span:last-child {
  transform: translateY(-6px) rotate(-45deg);
}

.primary-nav {
  grid-column: 1 / -1;
  padding-block-end: var(--space-3);
}

.js .primary-nav[hidden] {
  display: none;
}

.nav-list {
  display: grid;
  gap: var(--space-1);
  padding: 0;
  margin: 0;
  list-style: none;
}

.nav-list a {
  min-height: var(--touch-target-min);
  display: flex;
  align-items: center;
  padding-inline: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
}

.nav-list a:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.nav-list a[aria-current="page"] {
  background: transparent;
  box-shadow: inset 0 -2px var(--color-brand);
  color: var(--color-text);
}

.dashboard-button {
  grid-column: 1 / -1;
  justify-self: start;
  margin-block-end: var(--space-3);
}

.js .dashboard-button {
  display: none;
}

.js .menu-toggle[aria-expanded="true"] ~ .dashboard-button {
  display: inline-flex;
}

/* Compact horizontal navigation begins only when every destination fits. */
@media (min-width: 700px) {
  .navigation-shell {
    width: min(100% - 2rem, var(--container-max));
    grid-template-columns: max-content minmax(0, 1fr) max-content;
    gap: var(--space-2);
  }

  .menu-toggle {
    display: none;
  }

  .primary-nav {
    display: block;
  }

  .primary-nav {
    grid-column: auto;
    justify-self: center;
    padding-block-end: 0;
  }

  .nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }

  .nav-list a {
    padding-inline: var(--space-2);
    font-size: 0.8125rem;
    white-space: nowrap;
  }

  .brand {
    gap: var(--space-2);
  }

  .brand-logo {
    width: 2.25rem;
    height: 2.25rem;
  }

  .brand-name {
    overflow: visible;
    text-overflow: clip;
  }

  .js .dashboard-button {
    display: inline-flex;
    grid-column: auto;
    justify-self: end;
    margin-block-end: 0;
    padding-inline: var(--space-3);
    white-space: nowrap;
  }
}

@media (min-width: 1200px) {
  .navigation-shell {
    width: min(100% - (2 * var(--gutter)), var(--container-max));
    grid-template-columns: minmax(12rem, 1fr) auto minmax(12rem, 1fr);
    gap: var(--space-3);
  }

  .nav-list {
    gap: var(--space-2);
  }

  .nav-list a {
    padding-inline: var(--space-3);
    font-size: var(--font-size-sm);
  }

  .brand {
    gap: var(--space-3);
  }

  .brand-logo {
    width: 2.75rem;
    height: 2.75rem;
  }

  .dashboard-button {
    padding-inline: var(--space-4);
  }
}