/* ============================================
   HEADER STYLES
   ============================================ */

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background-color: var(--color-primary);
  color: #ffffff;
  padding: var(--space-2) var(--space-4);
  font-weight: 600;
  z-index: 101;
  transition: top var(--transition-fast);
}

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

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

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-primary);
  letter-spacing: -0.025em;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-accent);
}

/* Primary Navigation */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--text-base);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-accent);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

.nav-cta {
  margin-left: var(--space-4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 32px;
  height: 32px;
  gap: 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transition: all var(--transition-base);
  border-radius: 2px;
}

/* Mobile Styles */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
    z-index: 102;
  }
  
  .primary-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-8) var(--space-4);
    gap: var(--space-8);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }
  
  .primary-nav.is-open {
    transform: translateX(0);
  }
  
  .nav-list {
    flex-direction: column;
    width: 100%;
    gap: var(--space-4);
  }
  
  .nav-link {
    font-size: var(--text-xl);
    padding: var(--space-3) 0;
    display: block;
    width: 100%;
  }
  
  .nav-link::after {
    display: none;
  }
  
  .nav-cta {
    margin-left: 0;
    width: 100%;
    margin-top: var(--space-4);
    text-align: center;
  }
  
  /* Hamburger animation when open */
  .mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
}

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