.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 8, 20, 0.95), rgba(5, 8, 20, 0.85));
  border-bottom: 1px solid var(--color-border-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.skip-link {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: -100px;
  padding: 0.6rem 1.4rem;
  background: #000;
  color: var(--color-text);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-accent-soft);
  z-index: 50;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 30% 70% 55% 45%;
  background: conic-gradient(from 200deg, var(--color-primary), var(--color-primary-soft), var(--color-accent), var(--color-primary));
  box-shadow: var(--shadow-glow-red);
}

.site-header__logo-text {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-metal-light);
  white-space: nowrap;
}

.site-header__nav {
  display: flex;
}

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

.site-header__nav-item--highlight .site-header__nav-link {
  padding-inline: 0.9rem;
  padding-block: 0.45rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(229, 57, 69, 0.6);
  background: radial-gradient(circle at top, rgba(229, 57, 69, 0.22), transparent 65%);
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-block: 0.2rem;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-soft), var(--color-primary-soft));
  border-radius: 999px;
  transition: width var(--transition-base);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-text);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  width: 100%;
}

.site-header__toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-subtle);
  background: rgba(15, 23, 42, 0.9);
  color: var(--color-metal-light);
}

.site-header__toggle-box {
  position: relative;
  width: 20px;
  height: 16px;
}

.site-header__toggle-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--color-metal-light);
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.site-header__toggle-line--top {
  top: 0;
}

.site-header__toggle-line--middle {
  top: 7px;
}

.site-header__toggle-line--bottom {
  bottom: 0;
}

.site-header__toggle-text {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line--top {
  top: 7px;
  transform: rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line--middle {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line--bottom {
  bottom: 7px;
  transform: rotate(-45deg);
}

@media (max-width: 768px) {
  .site-header__inner {
    padding-block: var(--space-2);
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(3, 7, 18, 0.98));
    border-bottom: 1px solid var(--color-border-strong);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4) var(--space-4);
  }

  .site-header__nav-link {
    font-size: 0.78rem;
  }

  .site-header__nav--open {
    opacity: 1;
    transform: scaleY(1);
    visibility: visible;
    pointer-events: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-line {
    transition: none;
  }
}