/* Header styles */
.site-header {
  background-color: #fff;
  border-bottom: 1px solid #e0e0e0;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1rem;
}

.site-identity {
  font-family: 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: #333;
}

.site-logo {
  text-decoration: none;
  color: inherit;
}

.main-nav {
  display: flex;
  align-items: center;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #333;
  padding: 0.5rem;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.menu-toggle:hover,
.menu-toggle:focus {
  background-color: #f0f0f0;
  outline: 2px solid #007bff;
  outline-offset: 2px;
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2rem;
}

.nav-menu a {
  text-decoration: none;
  color: #555;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-menu a:hover,
.nav-menu a:focus {
  color: #007bff;
  outline: 2px solid #007bff;
  outline-offset: 2px;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #fff;
    flex-direction: column;
    gap: 0;
    border-top: 1px solid #e0e0e0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  }
  
  .nav-menu li {
    border-bottom: 1px solid #e0e0e0;
  }
  
  .nav-menu a {
    display: block;
    padding: 1rem;
  }
}

/* Focus trap for mobile menu */
.nav-menu[hidden] {
  display: none;
}

.nav-menu:not([hidden]) {
  display: flex;
}

/* Desktop styles (≥1024px) */
@media (min-width: 1024px) {
  .site-header {
    display: block;
    visibility: visible;
  }
  
  .header-container {
    display: flex;
  }
  
  .menu-toggle {
    display: none;
  }
  
  .nav-menu {
    display: flex !important;
    position: static;
    flex-direction: row;
    gap: 2rem;
    background-color: transparent;
    border-top: none;
    box-shadow: none;
  }
  
  .nav-menu[hidden] {
    display: flex !important;
  }
  
  .nav-menu li {
    border-bottom: none;
  }
  
  .nav-menu a {
    padding: 0;
  }
}