.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-fast);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  height: 64px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.site-header__brand:hover,
.site-header__brand:focus-visible {
  text-decoration: none;
}

.site-header__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.site-header__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

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

.site-header__toggle-icon {
  position: relative;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: background-color var(--transition-fast);
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-medium), top var(--transition-medium);
}

.site-header__toggle-icon::before {
  top: -8px;
}

.site-header__toggle-icon::after {
  top: 8px;
}

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

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-modal);
  padding: var(--space-16) var(--container-padding-mobile);
}

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

.site-header__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

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

.site-header__nav-link {
  display: block;
  padding: var(--space-12) var(--space-16);
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: var(--radius-small);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  background-color: var(--color-accent-sage-light);
  color: var(--color-accent-sage);
  text-decoration: none;
}

.site-header__nav-link[aria-current="page"] {
  color: var(--color-accent-sage);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 768px) {
  .site-header__inner {
    padding-inline: var(--container-padding-tablet);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    padding-inline: var(--container-padding-desktop);
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    width: auto;
    max-height: none;
    overflow-y: visible;
    background-color: transparent;
    border-bottom: none;
    box-shadow: none;
    padding: 0;
  }

  .site-header__nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-24);
  }

  .site-header__nav-link {
    padding: var(--space-8) 0;
    font-size: var(--text-small-size);
    line-height: 1.5;
    border-radius: 0;
  }

  .site-header__nav-link:hover,
  .site-header__nav-link:focus-visible {
    background-color: transparent;
    color: var(--color-accent-sage);
    text-decoration: underline;
    text-underline-offset: 3px;
  }
}

@media (min-width: 1280px) {
  .site-header__brand-text {
    font-size: 20px;
  }

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

@media (max-width: 1023px) {
  .site-header__brand-text {
    font-size: 18px;
  }

  .site-header__logo {
    width: 28px;
    height: 28px;
  }
}