.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-support);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  min-height: 72px;
}

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

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

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-support);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

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

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

.site-header__toggle[aria-expanded="true"] {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
}

.site-header__toggle-icon {
  position: relative;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-on-light);
  transition: background-color var(--transition-fast);
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-on-light);
  transition: transform var(--transition-fast);
}

.site-header__toggle-icon::before {
  top: -6px;
}

.site-header__toggle-icon::after {
  top: 6px;
}

.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(6px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

.site-header__nav {
  display: flex;
  align-items: center;
  flex-shrink: 1;
  min-width: 0;
}

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

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

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-body-size);
  font-weight: 500;
  line-height: var(--text-body-line-height);
  color: var(--color-text-on-light);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-accent);
}

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

@media (max-width: 1023px) {
  .site-header__inner {
    flex-wrap: wrap;
    min-height: 64px;
  }

  .site-header__brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    flex-basis: 100%;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
  }

  .site-header__nav.is-open {
    max-height: 400px;
    overflow-y: auto;
  }

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

  .site-header__nav-item + .site-header__nav-item {
    border-top: 1px solid var(--color-support);
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    text-align: left;
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    min-height: 80px;
  }

  .site-header__logo {
    width: 48px;
    height: 48px;
  }

  .site-header__brand-text {
    font-size: 1.25rem;
  }

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