/* Header-specific styles building on base.css */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-100);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.site-logo {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
  color: var(--gray-900);
}

.site-logo span {
  color: var(--color-primary-dark);
}

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

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

.site-header__nav-item a {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  font-weight: 500;
}

.site-header__nav-item a:hover {
  color: var(--color-primary-dark);
}

.site-header__nav-item--cta a {
  font-size: var(--font-size-sm);
}

/* Mobile menu toggle */

.site-header__menu-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--gray-200);
  background-color: var(--color-surface);
  cursor: pointer;
}

.site-header__menu-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.site-header__menu-toggle-text {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--gray-700);
}

.site-header__menu-toggle-icon {
  position: relative;
  width: 20px;
  height: 14px;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.site-header__menu-toggle-icon span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 999px;
  background-color: var(--gray-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

/* Open state */

.site-header--menu-open .site-header__menu-toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header--menu-open .site-header__menu-toggle-icon span:nth-child(2) {
  opacity: 0;
}

.site-header--menu-open .site-header__menu-toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive behavior */

@media (max-width: 768px) {
  .site-header__menu-toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: #ffffff;
    border-bottom: 1px solid var(--gray-100);
    box-shadow: var(--shadow-sm);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

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

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

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

  .site-header--menu-open .site-header__nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: scaleY(1);
  }
}

@media (min-width: 769px) {
  .site-header__nav {
    position: static;
  }
}