.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1200;
  background-color: transparent;
  border-bottom: 1px solid var(--color-border-dark);
  transition: border-color var(--transition-base);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: rgba(17, 17, 17, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  padding-block: var(--space-2);
}

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

.site-header__logo {
  width: 160px;
  height: 40px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text-on-dark);
  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;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-on-dark);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-header__close {
  display: none;
}

.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: 0;
}

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

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

.site-header__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-2);
  font-size: var(--text-small-size);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-on-dark);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

.site-header__link--cta {
  background-color: var(--color-accent);
  color: var(--color-ink);
  padding: 0 var(--space-3);
  border-radius: var(--radius-none);
  font-weight: 600;
}

.site-header__link--cta:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-ink);
}

@media (max-width: 991px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__logo {
    width: 128px;
    height: 32px;
  }

  .site-header__brand-text {
    font-size: 1.125rem;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background-color: var(--color-ink);
    border-left: 1px solid var(--color-border-dark);
    padding: var(--space-4) var(--space-4) var(--space-6);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    z-index: 1001;
    overflow-y: auto;
    overscroll-behavior: contain;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
  }

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

  .site-header__close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: flex-end;
    width: 44px;
    height: 44px;
    margin-bottom: var(--space-2);
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-on-dark);
    -webkit-tap-highlight-color: transparent;
  }

  .site-header__close-icon {
    position: relative;
    display: block;
    width: 20px;
    height: 20px;
  }

  .site-header__close-icon::before,
  .site-header__close-icon::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 20px;
    height: 2px;
    background-color: var(--color-text-on-dark);
    transition: background-color var(--transition-fast);
  }

  .site-header__close-icon::before {
    transform: translateY(-50%) rotate(45deg);
  }

  .site-header__close-icon::after {
    transform: translateY(-50%) rotate(-45deg);
  }

  .site-header__close:hover .site-header__close-icon::before,
  .site-header__close:hover .site-header__close-icon::after {
    background-color: var(--color-accent);
  }

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .site-header__item {
    width: 100%;
  }

  .site-header__link {
    display: flex;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-size: 1.25rem;
    text-transform: none;
    letter-spacing: 0;
  }

  .site-header__link--cta {
    justify-content: center;
    background-color: var(--color-accent);
    color: var(--color-ink);
    font-weight: 600;
  }
}

@media (max-width: 480px) {
  .site-header__logo {
    width: 112px;
    height: 28px;
  }

  .site-header__brand-text {
    font-size: 1rem;
  }
}