/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-xs);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

/* Branding */
.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-mint));
  color: #ffffff;
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
}

.site-header__logo-text {
  color: var(--color-text);
}

/* Navigation */
.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-mint));
  transition: width var(--transition-normal);
}

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

.site-header__nav-item--cta .site-header__nav-link--cta {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
  border: 1px solid transparent;
}

.site-header__nav-item--cta .site-header__nav-link--cta:hover {
  background-color: #ff666b;
}

.site-header__nav-item--cta .site-header__nav-link--cta:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: 3px;
}

/* Mobile toggle */
.site-header__toggle {
  display: none;
  align-items: center;
  gap: var(--space-8);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-gray-200);
  background-color: #ffffff;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.site-header__toggle-icon {
  position: relative;
  width: 18px;
  height: 14px;
}

.site-header__toggle-icon::before,
.site-header__toggle-icon::after,
.site-header__toggle-icon span {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

.site-header__toggle-icon::before {
  top: 0;
}

.site-header__toggle-icon::after {
  bottom: 0;
}

.site-header__toggle-icon span {
  top: 50%;
  transform: translateY(-50%);
}

/* Use a span inside for center bar (in HTML we rely on pseudo-element, but keep class for robustness) */
.site-header__toggle-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Open state */
.site-header--menu-open .site-header__toggle-icon::before {
  top: 6px;
  transform: rotate(45deg);
}

.site-header--menu-open .site-header__toggle-icon::after {
  bottom: 6px;
  transform: rotate(-45deg);
}

.site-header--menu-open .site-header__toggle-icon span {
  opacity: 0;
}

/* Responsive behavior */
@media (max-width: 768px) {
  .site-header__inner {
    gap: var(--space-16);
  }

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

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-4px);
    transition: max-height var(--transition-slow), opacity var(--transition-normal), transform var(--transition-normal);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-16);
    gap: var(--space-12);
  }

  .site-header--menu-open .site-header__nav {
    max-height: 320px;
    opacity: 1;
    transform: translateY(0);
  }

  .site-header__nav-link {
    width: 100%;
  }

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

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-icon::before,
  .site-header__toggle-icon::after,
  .site-header__toggle-icon span {
    transition: none !important;
  }
}