.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.site-header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 80px;
  padding-block: 0;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

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

.site-header__toggle:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.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: flex;
  align-items: center;
  margin-left: auto;
}

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

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

.site-header__nav-link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  padding-block: var(--space-2);
  position: relative;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-cobalt);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.site-header__nav-link:hover {
  color: var(--color-cobalt);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.site-header__nav-link:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

@media (max-width: 992px) {
  .site-header__brand-text {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 999;
    margin-left: 0;
  }

  .site-header__nav.is-open {
    transform: translateX(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

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

  .site-header__nav-link {
    display: block;
    padding: var(--space-3) var(--space-2);
    font-size: 18px;
  }

  .site-header__nav-link::after {
    display: none;
  }
}

@media (max-width: 576px) {
  .site-header__container {
    min-height: 64px;
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__nav {
    top: 64px;
  }
}