.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--overlay-dark);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--divider-line);
  height: 72px;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-primary);
  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;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-list li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-block;
  padding: var(--space-2) 0;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__nav-list a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-glow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.site-header__nav-list a:hover {
  color: var(--accent-glow-soft);
}

.site-header__nav-list a:hover::after {
  transform: scaleX(1);
}

.site-header__nav-list a:focus-visible {
  outline: 2px solid var(--accent-glow);
  outline-offset: 4px;
}

.site-header__cta {
  flex-shrink: 0;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 48px;
  height: 48px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--divider-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  border-color: var(--accent-glow);
  background-color: var(--surface-panel);
}

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

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 1px;
  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);
}

@media (max-width: 1024px) {
  .site-header__cta {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--surface-panel);
    border-bottom: 1px solid var(--divider-line);
    box-shadow: var(--shadow-deep);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--container-padding);
    z-index: 999;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    width: 100%;
  }

  .site-header__nav-list a {
    display: block;
    padding: var(--space-3) var(--space-4);
    font-size: 1.125rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
  }

  .site-header__nav-list a:hover {
    background-color: var(--bg-base);
    border-color: var(--divider-line);
  }

  .site-header__nav-list a::after {
    display: none;
  }
}

@media (max-width: 480px) {
  .site-header {
    height: 64px;
  }

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

  .site-header__brand-text {
    font-size: 1rem;
    letter-spacing: 0.06em;
  }

  .site-header__toggle {
    width: 44px;
    height: 44px;
  }

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