/* Header Specific Styles - Building on base.css variables */

.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.site-logo {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.site-logo__text {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  transition: color var(--transition-fast);
}

.site-logo:hover .site-logo__text {
  color: var(--color-primary-hover);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.nav-link--cta {
  background-color: var(--color-primary);
  color: var(--color-text-light)!important;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.nav-link--cta:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  gap: 6px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-background-alt);
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: 101;
  border-radius: 0 0 var(--radius-md) 0;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: var(--text-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6);
    gap: var(--space-2);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    border-top: 1px solid var(--color-border);
  }
  
  .nav-list.is-active {
    transform: translateX(0);
  }
  
  .nav-item {
    width: 100%;
    margin-bottom: 0;
  }
  
  .nav-link {
    font-size: var(--text-lg);
    padding: var(--space-4) 0;
    display: block;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-link::after {
    display: none;
  }
  
  .nav-link--cta {
    margin-top: var(--space-4);
    text-align: center;
    border-bottom: none;
    background-color: var(--color-primary);
  }
  
  /* Hamburger Animation */
  .mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  /* Prevent body scroll when menu open */
  body.menu-open {
    overflow: hidden;
  }
}

@media (max-width: 480px) {
  .header-container {
    height: 70px;
  }
  
  .nav-list {
    top: 70px;
  }
  
  .site-logo__text {
    font-size: var(--text-xl);
  }
}