.site-header {
  position: relative;
  z-index: 50;
  width: 100%;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-basalt);
}

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

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-paper);
  text-decoration: none;
}

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

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

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  gap: 0.05rem;
  line-height: 1;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--font-weight-heading);
  letter-spacing: var(--tracking-heading);
  white-space: nowrap;
}

.site-header__brand-subtitle {
  color: var(--color-muted);
  font-size: 0.5625rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.15em;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__nav {
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.75rem, 1.5vw, 1.5rem);
  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,
.site-header__mobile-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-paper);
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__nav-list a::after,
.site-header__mobile-links a::after {
  position: absolute;
  right: 0;
  bottom: 0.5rem;
  left: 0;
  height: 1px;
  background: var(--color-cyan);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.site-header__nav-list a:hover,
.site-header__mobile-links a:hover {
  color: var(--color-cyan);
}

.site-header__nav-list a:hover::after,
.site-header__mobile-links a:hover::after {
  transform: scaleX(1);
}

.site-header__mobile-links {
  display: none;
}

.site-header__download {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-cyan);
  background: var(--color-cyan);
  color: var(--color-basalt);
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.site-header__download svg {
  width: 1rem;
  height: 1rem;
  flex: 0 0 1rem;
  fill: currentColor;
}

.site-header__download:hover {
  border-color: var(--color-paper);
  background: var(--color-paper);
  color: var(--color-basalt);
  transform: translate(2px, -2px);
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.28rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 0;
  background: var(--color-graphite);
  color: var(--color-paper);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-cyan);
  background: var(--color-cyan-wash);
}

.nav-toggle__line {
  display: block;
  width: 1.125rem;
  height: 1px;
  background: currentColor;
  transform-origin: center;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(0.38rem) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-0.38rem) rotate(-45deg);
}

@media (max-width: 75rem) {
  .site-header__inner {
    gap: var(--space-4);
  }

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

  .site-header__download {
    padding-inline: 0.625rem;
  }
}

@media (max-width: 62rem) {
  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto auto;
    min-height: 4.75rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    top: calc(100% + 1px);
    right: var(--gutter);
    left: var(--gutter);
    display: grid;
    max-height: min(70vh, 34rem);
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-top: 2px solid var(--color-cyan);
    background-color: var(--color-graphite);
    background-image: linear-gradient(rgba(63, 63, 70, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(63, 63, 70, 0.08) 1px, transparent 1px);
    background-size: 24px 24px;
    box-shadow: var(--shadow-elevated);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.5rem);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
  }

  .site-header__nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-header__nav-list {
    display: grid;
    justify-content: stretch;
    gap: 0;
    padding: var(--space-2) var(--space-4);
  }

  .site-header__nav-list li {
    display: block;
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__nav-list a,
  .site-header__mobile-links a {
    width: 100%;
    min-height: 3rem;
  }

  .site-header__nav-list a::after,
  .site-header__mobile-links a::after {
    bottom: 0;
  }

  .site-header__mobile-links {
    display: grid;
    gap: 0;
    padding: 0 var(--space-4) var(--space-3);
  }

  .site-header__mobile-links a {
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__mobile-links a:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 40rem) {
  .site-header__inner {
    gap: var(--space-3);
    min-height: 4.5rem;
  }

  .site-header__logo {
    width: 2.25rem;
    height: 2.25rem;
    flex-basis: 2.25rem;
  }

  .site-header__brand-subtitle {
    display: none;
  }

  .site-header__brand-name {
    font-size: 1.125rem;
  }

  .site-header__download {
    width: 2.75rem;
    padding: 0;
  }

  .site-header__download span {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

@media (max-width: 26.25rem) {
  .site-header__brand-copy {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__download,
  .nav-toggle,
  .nav-toggle__line {
    transition: none;
  }

  .site-header__download:hover {
    transform: none;
  }
}

ul {
  list-style: none !important;
}

.nav-toggle {
  flex-direction: column;
}