.sfv-header {
  position: sticky;
  top: 0;
  z-index: 40;
}

.sfv-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

.sfv-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.sfv-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: radial-gradient(circle at 30% 10%, #ffb648 0, transparent 55%),
    radial-gradient(circle at 70% 90%, #ff4f6d 0, transparent 55%),
    #050814;
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: var(--shadow-glow-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.sfv-header__logo-chip {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 0 3px rgba(255, 79, 109, 0.5);
}

.sfv-header__brand-text {
  display: flex;
  flex-direction: column;
}

.sfv-header__brand-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sfv-header__brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.sfv-header__nav {
  display: flex;
  align-items: center;
}

.sfv-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.sfv-header__nav-link {
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-decoration: none;
}

.sfv-header__nav-link:hover,
.sfv-header__nav-link:focus-visible {
  color: #ffffff;
}

.sfv-header__nav-item--highlight .sfv-header__nav-link {
  text-transform: none;
  letter-spacing: 0.04em;
}

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

.sfv-header__toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  background: rgba(5, 8, 20, 0.9);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.sfv-header__toggle-bar {
  position: absolute;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #ffffff;
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.sfv-header__toggle-bar:nth-child(1) {
  top: 14px;
}

.sfv-header__toggle-bar:nth-child(2) {
  top: 20px;
}

.sfv-header__toggle-bar:nth-child(3) {
  bottom: 14px;
}

.sfv-header__toggle[aria-expanded="true"] .sfv-header__toggle-bar:nth-child(1) {
  top: 20px;
  transform: rotate(45deg);
}

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

.sfv-header__toggle[aria-expanded="true"] .sfv-header__toggle-bar:nth-child(3) {
  bottom: 20px;
  transform: rotate(-45deg);
}

.sfv-header__overlay {
  display: none;
}

@media (max-width: 768px) {
  .sfv-header__toggle {
    display: inline-flex;
  }

  .sfv-header__nav-list {
    position: fixed;
    inset-inline: 0;
    top: 64px;
    background: radial-gradient(circle at top, rgba(10, 10, 30, 0.98), rgba(5, 8, 20, 0.98));
    border-top: 1px solid var(--color-border-subtle);
    padding: var(--space-4) var(--space-4) var(--space-6);
    flex-direction: column;
    gap: var(--space-3);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .sfv-header__nav-list.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .sfv-header__nav-item--highlight {
    width: 100%;
  }

  .sfv-header__nav-item--highlight .btn {
    width: 100%;
    justify-content: center;
  }

  .sfv-header__overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(2px);
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-base);
  }

  .sfv-header__overlay.is-active {
    display: block;
    opacity: 1;
    z-index: 30;
  }

  body.sfv-nav-open {
    overflow: hidden;
  }
}

@media (max-width: 480px) {
  .sfv-header__brand-tagline {
    display: none;
  }
}