.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  backdrop-filter: blur(var(--blur-glass));
  -webkit-backdrop-filter: blur(var(--blur-glass));
  background: linear-gradient(to bottom, rgba(2, 6, 23, 0.96), rgba(2, 6, 23, 0.9), transparent);
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.site-header__inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  background: radial-gradient(circle at 25% 0, rgba(255, 51, 102, 0.95), transparent 55%), radial-gradient(circle at 75% 100%, rgba(79, 70, 229, 0.95), transparent 55%);
  border: 1px solid rgba(248, 250, 252, 0.55);
  box-shadow: 0 0 0 1px rgba(2, 6, 23, 0.95), var(--shadow-strong);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-header__title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text);
  white-space: nowrap;
}

.site-header__subtitle {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-item {
  flex: 0 0 auto;
}

.site-header__nav-item--accent {
  margin-left: 0.5rem;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  padding-bottom: 0.1rem;
  white-space: nowrap;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.18rem;
  width: 100%;
  height: 1px;
  background: var(--gradient-accent);
  transform-origin: left;
  transform: scaleX(0);
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

.site-header__nav-link:hover::after {
  transform: scaleX(1);
  opacity: 1;
}

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

.site-header__nav-link.is-active::after {
  transform: scaleX(1);
  opacity: 1;
}

.site-header__nav-link--cta {
  padding: 0.4rem 0.95rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(248, 250, 252, 0.18);
  background-image: var(--gradient-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-soft);
}

.site-header__nav-link--cta::after {
  display: none;
}

.site-header__nav-link--cta:hover {
  filter: brightness(1.05);
}

.site-header__toggle {
  display: none;
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.8);
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.98));
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
}

.site-header__toggle-icon {
  display: block;
  width: 1.2rem;
  height: 1px;
  background: rgba(248, 250, 252, 0.9);
  position: relative;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: inherit;
  transition: transform var(--transition-fast), top var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle-icon::before {
  top: -0.32rem;
}

.site-header__toggle-icon::after {
  top: 0.32rem;
}

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

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::before {
  transform: rotate(-90deg);
  top: 0;
}

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

@media (max-width: 1024px) {
  .site-header__inner {
    height: 3.75rem;
  }
  .site-header__subtitle {
    display: none;
  }
  .site-header__title {
    font-size: 0.8rem;
    letter-spacing: 0.14em;
  }
  .site-header__nav-list {
    position: fixed;
    inset: calc(var(--header-height) - 1px) 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1.25rem 1.25rem 1.75rem;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(2, 6, 23, 0.98));
    border-bottom: 1px solid rgba(148, 163, 184, 0.45);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
  }
  .site-header__nav-list.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-header__nav-item--accent {
    margin-left: 0;
    margin-top: 0.25rem;
  }
  .site-header__nav-link,
  .site-header__nav-link--cta {
    font-size: 0.8rem;
  }
  .site-header__nav-link--cta {
    padding-inline: 1.1rem;
    width: auto;
  }
  .site-header__toggle {
    display: inline-flex;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    gap: var(--space-sm);
  }
  .site-header__brand-text {
    max-width: 9.5rem;
  }
  .site-header__title {
    font-size: 0.78rem;
  }
}

@media (max-width: 480px) {
  .site-header__logo {
    width: 2.2rem;
    height: 2.2rem;
  }
  .site-header__brand-text {
    max-width: 8.5rem;
  }
}