.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--surface-primary);
  border-bottom: var(--border-width) solid var(--border-color);
  width: 100%;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  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);
  flex-shrink: 0;
  min-width: 0;
}

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

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

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: var(--text-h4);
  font-weight: 600;
  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: 5px;
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform var(--transition-transform), opacity var(--transition-color);
  transform-origin: center;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

.site-header__nav {
  display: block;
  margin-left: auto;
}

.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;
  flex-shrink: 0;
}

.site-header__link {
  display: inline-block;
  font-size: var(--text-caption);
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-ink);
  text-decoration: none;
  padding-block: var(--space-2);
  position: relative;
  transition: color var(--transition-color);
  white-space: nowrap;
}

.site-header__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-tomato);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-transform);
}

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

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

.site-header__link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
}

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

  .site-header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--surface-primary);
    border-bottom: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-elevated);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 999;
  }

  .site-header__nav.is-open {
    display: block;
  }

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4) var(--container-padding);
  }

  .site-header__item {
    width: 100%;
  }

  .site-header__link {
    display: block;
    padding: var(--space-3) 0;
    font-size: var(--text-body);
    border-bottom: var(--border-width) solid var(--border-color);
  }

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

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

@media (max-width: 480px) {
  .site-header__inner {
    min-height: 64px;
    padding-block: var(--space-2);
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

  .site-header__brand-text {
    font-size: var(--text-h4);
  }

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