.site-header {
  position: relative;
  z-index: 100;
  width: 100%;
  border-bottom: 1px solid rgba(15, 23, 42, 0.1);
  background: var(--color-porcelain);
}

.site-header__inner {
  display: flex;
  align-items: center;
  min-height: 4.5rem;
  gap: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  flex: 1 1 auto;
  align-items: center;
  min-width: 0;
  min-height: 2.75rem;
  gap: var(--space-2);
  color: var(--color-deep-eclipse);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__logo {
  flex: 0 0 auto;
  width: 2.125rem;
  height: 2.125rem;
  object-fit: contain;
}

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

.site-header__toggle {
  display: inline-flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  min-height: 2.75rem;
  gap: 0.25rem;
  border-radius: var(--radius-md) var(--radius-md) var(--radius-sm) var(--radius-md);
  padding: 0;
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header--menu-open .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.375rem) rotate(45deg);
}

.site-header--menu-open .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header--menu-open .site-header__toggle-line:nth-child(3) {
  transform: translateY(-0.375rem) rotate(-45deg);
}

.site-header__nav {
  position: absolute;
  top: calc(100% + 1px);
  right: 0;
  left: 0;
  display: grid;
  max-height: min(70vh, 36rem);
  overflow-x: hidden;
  overflow-y: auto;
  border-bottom: 1px solid rgba(15, 23, 42, 0.1);
  background: var(--color-porcelain);
  padding: var(--space-4) max(var(--container-inline), 1rem) var(--space-5);
  transform: translateY(-0.75rem);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.site-header--menu-open .site-header__nav {
  transform: translateY(0);
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

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

.site-header__nav-list li,
.site-header__nav-list li + li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-deep-eclipse);
  font-size: var(--text-small);
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  background: rgba(79, 70, 229, 0.08);
  color: var(--color-electric-indigo);
}

.site-header__download {
  width: 100%;
  margin-top: var(--space-4);
}

.site-header__mobile-only {
  display: list-item;
}

@media (min-width: 34rem) {
  .site-header__inner {
    min-height: 4.75rem;
  }

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

  .site-header__logo {
    width: 2.5rem;
    height: 2.5rem;
  }
}

@media (min-width: 66rem) {
  .site-header {
    background: rgba(255, 255, 255, 0.92);
  }

  @supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
    .site-header {
      -webkit-backdrop-filter: blur(16px);
      backdrop-filter: blur(16px);
    }
  }

  .site-header__inner {
    min-height: 5rem;
    gap: var(--space-5);
  }

  .site-header__brand {
    flex: 0 0 auto;
    font-size: 1.125rem;
  }

  .site-header__logo {
    width: 2.5rem;
    height: 2.5rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    position: static;
    display: flex;
    flex: 1 1 auto;
    align-items: center;
    justify-content: flex-end;
    max-height: none;
    overflow: visible;
    border: 0;
    background: transparent;
    padding: 0;
    transform: none;
    transition: none;
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
  }

  .site-header__nav-list {
    display: flex;
    flex: 1 1 auto;
    align-items: center;
    justify-content: flex-end;
    gap: clamp(0.125rem, 0.7vw, 0.625rem);
  }

  .site-header__nav-list a {
    min-height: 2.75rem;
    padding-inline: clamp(0.375rem, 0.7vw, 0.625rem);
    white-space: nowrap;
  }

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

  .site-header__download {
    flex: 0 0 auto;
    width: auto;
    margin-top: 0;
    margin-left: var(--space-2);
    white-space: nowrap;
  }
}

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

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--color-porcelain);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}