/* Header Layout */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-background-alt);
  border-bottom: 1px solid var(--color-gray-200);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5rem;
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-gray-900);
  letter-spacing: -0.02em;
}

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

/* Desktop Navigation */
.nav-primary {
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

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

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

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

.nav__link:hover::after {
  width: 100%;
}

.nav__link--cta {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

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

.nav__link--cta::after {
  display: none;
}

/* Mobile Toggle */
.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.header__toggle-bar {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-gray-800);
  transition: transform var(--transition-base), opacity var(--transition-base);
  border-radius: 2px;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
  position: fixed;
  top: 5rem;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-background-alt);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
  padding: var(--space-6) 0;
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav__link {
  display: block;
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-gray-100);
}

.mobile-nav__link:hover {
  color: var(--color-primary);
}

.mobile-nav__link--cta {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  text-align: center;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin-top: var(--space-4);
  border-bottom: none;
}

.mobile-nav__link--cta:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-primary-contrast);
}

/* Responsive */
@media (min-width: 1024px) {
  .nav-primary {
    display: block;
  }
  
  .header__toggle {
    display: none;
  }
  
  .mobile-nav {
    display: none !important;
  }
}

/* Focus States */
.header a:focus-visible,
.header button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}