.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(5, 7, 11, 0.96), rgba(5, 7, 11, 0.85));
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

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

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

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.95rem;
  color: var(--color-text);
}

.site-header__logo::after {
  content: none;
}

.site-header__logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background:
    conic-gradient(from 210deg, #ff3b3f, #ff9f1c, #1ac4ff, #ff3b3f);
  padding: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.75);
}

.site-header__logo-mark::before {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background:
    linear-gradient(135deg, #05070b, #080c12 45%, #101623 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.site-header__logo-text {
  white-space: nowrap;
}

.site-header__nav {
  display: flex;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  padding-block: 0.15rem;
}

.site-header__nav-link::after {
  height: 2px;
  bottom: -0.3rem;
}

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

.site-header__nav-link--active,
.site-header__nav-link[aria-current="page"] {
  color: var(--color-text);
}

.site-header__nav-link--active::after,
.site-header__nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-header__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-subtle);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.25rem;
  background: rgba(5, 8, 17, 0.9);
  color: var(--color-text);
}

.site-header__toggle-bar {
  width: 1.25rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-gray-200);
  transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-info-cyan);
  outline-offset: 3px;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 768px) {
  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: 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, #141923 0, #05070b 60%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-3) var(--space-4) var(--space-4);
    gap: 0.75rem;
  }

  .site-header__nav-link {
    width: 100%;
    padding-block: 0.35rem;
  }

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

@media (min-width: 769px) {
  .site-header__nav {
    position: static;
  }
}