/* Header Styles - Monday Shop Energy Services */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-neutral-200);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.2;
}

.brand__name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.brand__tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.primary-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-list a {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-list a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

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

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

.nav-list .nav-cta {
  background-color: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav-list .nav-cta:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

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

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 101;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-neutral-200);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .primary-nav.is-active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-list {
    flex-direction: column;
    gap: var(--space-2);
    width: 100%;
  }
  
  .nav-list li {
    width: 100%;
  }
  
  .nav-list a {
    display: block;
    width: 100%;
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }
  
  .nav-list a:hover {
    background-color: var(--color-surface);
  }
  
  .nav-list a::after {
    display: none;
  }
  
  .nav-list .nav-cta {
    text-align: center;
    margin-top: var(--space-2);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
  }
}

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