.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.5rem;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

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

.site-header__logo {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.3125rem;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: var(--color-surface-alt);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header__toggle-line {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--transition-medium), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.4375rem) 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(-0.4375rem) rotate(-45deg);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-left: auto;
  flex-shrink: 0;
}

.site-header__list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__item {
  margin: 0;
  padding: 0;
}

.site-header__link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0 var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--color-text-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
  position: relative;
}

.site-header__link::after {
  content: "";
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: 0.25rem;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-medium);
}

.site-header__link:hover {
  color: var(--color-accent);
}

.site-header__link:hover::after {
  transform: scaleX(1);
}

.site-header__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header__cta {
  flex-shrink: 0;
}

@media (max-width: 63.9375rem) {
  .site-header__inner {
    min-height: 4rem;
    padding-block: var(--space-2);
  }

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

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

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(85vw, 20rem);
    max-width: 100%;
    background-color: var(--color-background);
    box-shadow: var(--shadow-elevated);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    padding: var(--space-6) var(--space-5);
    margin: 0;
    transform: translateX(100%);
    transition: transform var(--transition-medium);
    overflow-y: auto;
    z-index: 1001;
    visibility: hidden;
  }

  .site-header__nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .site-header__link {
    display: flex;
    justify-content: space-between;
    padding: var(--space-3) var(--space-2);
    min-height: 2.75rem;
    border-bottom: 1px solid var(--color-border);
  }

  .site-header__link::after {
    display: none;
  }

  .site-header__cta {
    margin-top: var(--space-2);
  }
}

@media (min-width: 64rem) {
  .site-header__nav {
    visibility: visible;
    transform: none;
    position: static;
    flex-direction: row;
    width: auto;
    background: transparent;
    box-shadow: none;
    padding: 0;
    overflow: visible;
  }
}