/* Header layout and branding */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: #ffffff;
  border-bottom: 1px solid var(--gray-200);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.header-branding {
  display: flex;
  align-items: center;
  min-width: 0;
}

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

.header-logo-mark {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 30% 20%, #ccfbf1 0, #0f766e 50%, #115e59 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.header-logo-initial {
  color: #ffffff;
  font-weight: 700;
  font-size: 1.25rem;
}

.header-title-group {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.header-site-title {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--gray-900);
  white-space: nowrap;
}

.header-site-tagline {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* Navigation */
.header-nav {
  display: flex;
  align-items: center;
}

.header-nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
}

.header-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.1rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
}

.header-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.05rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-fast);
}

.header-nav-link:hover {
  color: var(--gray-900);
}

.header-nav-link:hover::after {
  transform: scaleX(1);
}

.header-nav-link--cta {
  padding-inline: 0.9rem;
  padding-block: 0.45rem;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.header-nav-link--cta::after {
  display: none;
}

.header-nav-link--cta:hover {
  background-color: var(--color-primary-dark);
}

.header-nav-cta {
  margin-left: var(--space-2);
}

/* Mobile toggle */
.header-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-300);
  background-color: #ffffff;
  cursor: pointer;
}

.header-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.header-toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-800);
  transition: transform var(--transition-fast), opacity var(--transition-fast),
    background-color var(--transition-fast);
}

.header-toggle-text {
  font-size: 0.85rem;
  color: var(--gray-700);
}

/* Toggle active state (JS adds .is-open to .site-header) */
.site-header.is-open .header-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header.is-open .header-toggle-bar:nth-child(2) {
  opacity: 0;
}

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

/* Responsive behavior */
@media (max-width: 767.98px) {
  .header-container {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .header-site-title {
    font-size: 0.85rem;
  }

  .header-site-tagline {
    display: none;
  }

  .header-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: #ffffff;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
  }

  .site-header.is-open .header-nav {
    max-height: 18rem;
  }

  .header-nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-3) var(--space-4) var(--space-4);
    gap: var(--space-2);
  }

  .header-nav-cta {
    margin-left: 0;
    margin-top: var(--space-2);
    width: 100%;
  }

  .header-nav-link--cta {
    width: 100%;
    justify-content: center;
  }
}

@media (min-width: 768px) {
  .header-toggle {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-logo-mark {
    width: 2.2rem;
    height: 2.2rem;
  }

  .header-site-title {
    max-width: 11rem;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}