.site-header {
  position: relative;
  z-index: 50;
  border-bottom: 1px solid var(--color-slate-700);
  background: var(--color-ink-900);
}

.site-header__inner {
  display: grid;
  min-height: 4.75rem;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  column-gap: var(--space-5, 1.25rem);
  row-gap: 0;
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex-shrink: 0;
  align-items: center;
  gap: 0.625rem;
  z-index: 1;
  color: var(--color-text-primary);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 2.5rem;
  object-fit: contain;
}

.site-header__brand-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__nav {
  min-width: 0;
  max-width: 100%;
  justify-self: center;
  overflow: hidden;
}

.site-header__nav-list {
  display: flex;
  align-items: stretch;
  justify-content: center;
  flex-wrap: nowrap;
  gap: clamp(0.5rem, 1vw, 1rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-item {
  display: flex;
  margin: 0;
  padding: 0;
  flex: 0 0 auto;
}

.site-header__nav-item--mobile-only {
  display: none;
}

.site-header__nav-link {
  display: inline-flex;
  min-height: 4.75rem;
  align-items: center;
  border-bottom: 2px solid transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__nav-link[aria-current="page"] {
  border-bottom-color: var(--color-amber);
  color: var(--color-text-primary);
  text-decoration: none;
}

.site-header__actions {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  z-index: 1;
}

.site-header__download {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.site-header__download span[aria-hidden="true"],
.site-header__nav-download span[aria-hidden="true"] {
  font-size: 0.7em;
  flex: 0 0 auto;
}

.site-header__toggle {
  display: none;
}

/* Tablet / laptop: hamburger earlier so desktop row never overlaps */
@media (max-width: 84rem) {
  .site-header__inner {
    min-height: 4.5rem;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-3);
  }

  .site-header__logo {
    width: 2rem;
    height: 2rem;
    flex-basis: 2rem;
  }

  .site-header__brand {
    font-size: 1.0625rem;
  }

  .site-header__actions {
    display: none;
  }

  .site-header__toggle {
    display: inline-flex;
    width: 2.75rem;
    min-height: 2.75rem;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0;
    border: 1px solid var(--color-slate-700);
    border-radius: var(--radius-md);
    background: var(--color-ink-900);
  }

  .site-header__toggle:hover {
    border-color: var(--color-slate-600);
    background: var(--color-ink-800);
  }

  .site-header__toggle-line {
    display: block;
    width: 1.125rem;
    height: 2px;
    border-radius: 1px;
    background: var(--color-text-primary);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
    transform: translateY(0.375rem) rotate(45deg);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
    opacity: 0;
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
    transform: translateY(-0.375rem) rotate(-45deg);
  }

  /* Full-width mobile/tablet drawer */
  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    max-width: none;
    justify-self: stretch;
    display: none;
    max-height: min(75vh, calc(100vh - 4.5rem));
    overflow-x: hidden;
    overflow-y: auto;
    border: 0;
    border-top: 1px solid var(--color-slate-700);
    border-radius: 0;
    background: var(--color-ink-900);
    box-shadow: var(--shadow-panel);
  }

  .site-header__nav.is-open {
    display: block;
  }

  .site-header__nav-list {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    width: 100%;
    gap: 0;
    padding: var(--space-3) var(--space-4) var(--space-4);
  }

  .site-header__nav-item,
  .site-header__nav-item--mobile-only {
    display: block;
    width: 100%;
  }

  .site-header__nav-link {
    display: flex;
    width: 100%;
    min-height: 3rem;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-slate-700);
    border-radius: 0;
    font-size: 0.9375rem;
    text-align: center;
  }

  .site-header__nav-item:last-child .site-header__nav-link {
    border-bottom: 0;
  }

  .site-header__nav-link:hover,
  .site-header__nav-link[aria-current="page"] {
    background: var(--color-ink-800);
    border-bottom-color: var(--color-slate-700);
    color: var(--color-amber-soft);
  }

  .site-header__nav-download {
    display: inline-flex;
    width: 100%;
    min-height: 3rem;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-3);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    background: var(--color-amber);
    color: var(--color-ink-950);
    font-family: var(--font-heading);
    font-size: 0.9375rem;
    font-weight: 700;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
  }

  .site-header__nav-download:hover {
    background: var(--color-amber-soft);
    color: var(--color-ink-950);
    text-decoration: none;
  }
}

@media (max-width: 28rem) {
  .site-header__inner {
    min-height: 4.25rem;
    width: 100%;
    max-width: none;
  }

  .site-header__brand {
    gap: var(--space-2);
    font-size: 1rem;
  }

  .site-header__logo {
    width: 1.875rem;
    height: 1.875rem;
    flex-basis: 1.875rem;
  }

  .site-header__nav-list {
    padding-inline: var(--space-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__toggle-line {
    transition: none;
  }
}