.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-cloud-white);
  border-bottom: var(--border-subtle);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-color), background-color var(--transition-color);
}

.site-header.is-compact {
  box-shadow: var(--shadow-elevated);
  background-color: rgba(248, 249, 250, 0.95);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  padding-block: var(--space-3);
}

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

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__brand-tagline {
  font-size: var(--text-caption-size);
  line-height: var(--text-caption-line-height);
  font-weight: var(--text-caption-weight);
  letter-spacing: var(--text-caption-tracking);
  text-transform: uppercase;
  color: var(--color-slate-gray);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: var(--min-touch-target);
  height: var(--min-touch-target);
  border-radius: var(--radius-small);
  background: none;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-color);
}

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

.site-header__toggle:focus-visible {
  outline: 3px solid var(--color-focus-outline);
  outline-offset: 2px;
}

.site-header__toggle-icon,
.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-ink-dark);
  border-radius: 2px;
  transition: transform var(--transition-transform), opacity var(--transition-color);
  content: "";
}

.site-header__toggle-icon {
  position: relative;
}

.site-header__toggle-icon::before {
  position: absolute;
  top: -7px;
  left: 0;
}

.site-header__toggle-icon::after {
  position: absolute;
  top: 7px;
  left: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon {
  background-color: transparent;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::before {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-left: auto;
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--min-touch-target);
  padding-inline: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-small-size);
  line-height: 1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-ink-dark);
  border-radius: var(--radius-small);
  transition: color var(--transition-color), background-color var(--transition-color);
  white-space: nowrap;
}

.site-header__nav-link:hover {
  color: var(--color-electric-violet);
  background-color: var(--surface-hover);
}

.site-header__nav-link:focus-visible {
  outline: 3px solid var(--color-focus-outline);
  outline-offset: 2px;
}

.site-header__cta {
  flex-shrink: 0;
  white-space: nowrap;
}

@media (max-width: 1024px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-cloud-white);
    border-bottom: var(--border-subtle);
    box-shadow: var(--shadow-elevated);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height var(--transition-transform), visibility var(--transition-transform);
    z-index: 999;
  }

  .site-header__nav.is-open {
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    visibility: visible;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) 0;
  }

  .site-header__nav-link {
    justify-content: flex-start;
    padding: var(--space-3) var(--space-5);
    border-radius: 0;
    width: 100%;
  }

  .site-header__cta {
    margin: var(--space-3) var(--space-5) var(--space-5);
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    min-height: 64px;
    padding-block: var(--space-2);
  }

  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__brand-name {
    font-size: 1rem;
  }

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

  .site-header__nav.is-open {
    max-height: calc(100vh - 64px);
  }
}