.ss-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: radial-gradient(circle at top, rgba(79, 209, 197, 0.14), rgba(5, 7, 11, 0.96));
  border-bottom: 1px solid var(--border-subtle);
}

.ss-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  gap: var(--space-8);
}

.ss-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.ss-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
}

.ss-header__logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 32% 68% 35% 65% / 40% 38% 62% 60%;
  background: conic-gradient(from 210deg, var(--color-primary), var(--color-accent-blue), var(--color-accent-emerald), var(--color-primary));
  box-shadow: var(--shadow-glow-primary);
  position: relative;
}

.ss-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.4), transparent 55%),
              radial-gradient(circle at 70% 80%, rgba(15, 23, 42, 0.95), #020617 80%);
}

.ss-header__title-group {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.ss-header__site-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.ss-header__site-tagline {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-text-soft);
}

.ss-header__nav {
  display: flex;
}

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

.ss-header__nav-link {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-text-muted);
  padding: 0.35rem 0;
  position: relative;
}

.ss-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-blue));
  transform-origin: center;
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

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

.ss-header__nav-link:hover::after,
.ss-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.ss-header__nav-item--cta .ss-header__nav-link--cta {
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(circle at top, rgba(79, 209, 197, 0.16), rgba(15, 23, 42, 0.95));
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.8);
}

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

.ss-header__nav-item--cta .ss-header__nav-link--cta:hover,
.ss-header__nav-item--cta .ss-header__nav-link--cta:focus-visible {
  border-color: rgba(79, 209, 197, 0.9);
  box-shadow: var(--shadow-glow-primary);
  color: var(--color-heading);
}

.ss-header__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(circle at top, rgba(79, 209, 197, 0.18), rgba(15, 23, 42, 0.98));
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.ss-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: var(--transition-transform), background-color var(--transition-base), opacity var(--transition-base);
}

.ss-header__toggle--open .ss-header__toggle-bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.ss-header__toggle--open .ss-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.ss-header__toggle--open .ss-header__toggle-bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

@media (max-width: 768px) {
  .ss-header__inner {
    padding-top: var(--space-4);
    padding-bottom: var(--space-4);
  }

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

  .ss-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    max-height: 0;
    overflow: hidden;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(2, 6, 23, 0.98));
    border-bottom: 1px solid var(--border-subtle);
    transition: max-height var(--transition-slow);
  }

  .ss-header__nav--open {
    max-height: 360px;
  }

  .ss-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6) var(--space-8) var(--space-8);
    gap: var(--space-4);
  }

  .ss-header__nav-item--cta {
    width: 100%;
  }

  .ss-header__nav-item--cta .ss-header__nav-link--cta {
    display: inline-flex;
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 520px) {
  .ss-header__site-tagline {
    display: none;
  }
}