.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-glass);
}

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

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

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

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  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;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: rgba(0, 180, 216, 0.08);
}

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

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

.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;
  flex-shrink: 1;
  min-width: 0;
}

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

.site-header__item {
  margin: 0;
  padding: 0;
}

.site-header__item + .site-header__item {
  margin: 0;
}

.site-header__link {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding-inline: var(--space-xs);
  font-size: var(--text-body-small-size);
  font-weight: 500;
  line-height: var(--text-body-small-line-height);
  color: var(--color-ink-muted);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast);
}

.site-header__link::after {
  content: "";
  position: absolute;
  left: var(--space-xs);
  right: var(--space-xs);
  bottom: 4px;
  height: 2px;
  background-color: var(--color-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

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

.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: 1023px) {
  .site-header__inner {
    height: 64px;
  }

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

  .site-header__brand-text {
    font-size: 1.1rem;
  }

  .site-header__toggle {
    display: flex;
    z-index: 99999;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    max-width: 100%;
    background-color: var(--color-canvas);
    border-left: 1px solid var(--color-glass-border);
    box-shadow: -8px 0 24px var(--color-glass-shadow);
    padding: var(--space-xl);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-lg);
    overflow-y: auto;
    z-index: 1001;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform var(--transition-fast), visibility var(--transition-fast);
  }

  .site-header__nav[data-site-header-nav].is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
    width: 100%;
  }

  .site-header__item {
    width: 100%;
  }

  .site-header__link {
    display: flex;
    align-items: center;
    height: 48px;
    padding-inline: var(--space-md);
    font-size: var(--text-body-size);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
  }

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

  .site-header__link:hover {
    background-color: rgba(0, 180, 216, 0.08);
    color: var(--color-cyan);
  }
}

@media (max-width: 479px) {
  .site-header__brand-text {
    display: none;
  }

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