.zv-header {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.zv-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  gap: var(--space-4);
}

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

.zv-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
}

.zv-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: var(--shadow-md);
}

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

.zv-header__brand-name {
  font-weight: 600;
  letter-spacing: 0.01em;
}

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

.zv-header__nav {
  margin-left: auto;
}

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

.zv-header__nav-link {
  position: relative;
  font-size: var(--text-sm);
  color: var(--color-text);
  padding: 0.25rem 0;
}

.zv-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 999px;
  transition: width var(--transition-normal);
}

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

.zv-header__nav-item--cta .zv-header__nav-link--button {
  padding-inline: 1.1rem;
  font-size: var(--text-sm);
}

.zv-header__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface);
  align-items: center;
  justify-content: center;
  padding: 0;
}

.zv-header__toggle-bar {
  width: 1.2rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-neutral-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

.zv-header__toggle-bar + .zv-header__toggle-bar {
  margin-top: 4px;
}

.zv-header__toggle.is-open .zv-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.zv-header__toggle.is-open .zv-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 768px) {
  .zv-header__inner {
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
  }

  .zv-header__brand-tagline {
    display: none;
  }

  .zv-header__toggle {
    display: inline-flex;
    margin-left: auto;
    flex-direction: column;
  }

  .zv-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
    transform-origin: top;
    transform: scaleY(0.95);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
  }

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

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

  .zv-header__nav-item--cta .zv-header__nav-link--button {
    width: 100%;
    justify-content: center;
  }

  .zv-header__nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: scaleY(1);
  }
}

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