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

/* Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  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 */
.site-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--color-text);
  font-family: 'Playfair Display', var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: color var(--duration-base) var(--ease-out);
}

.site-brand:hover {
  color: var(--color-primary-dark);
}

/* Primary Navigation */
.primary-nav {
  display: flex;
  align-items: center;
}

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

.nav-list a {
  display: block;
  padding: var(--space-2) 0;
  color: var(--color-text-secondary);
  font-family: 'Inter', var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.01em;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--color-primary-dark);
}

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

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

/* CTA Button */
.nav-cta {
  background-color: var(--color-accent);
  color: #FFFFFF !important;
  padding: var(--space-3) var(--space-5) !important;
  border-radius: var(--radius-md);
  transition: all var(--duration-base) var(--ease-out) !important;
}

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

.nav-cta::after {
  display: none !important;
}

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

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--duration-base) var(--ease-out);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

/* Animated X state */
.mobile-menu-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* Responsive Navigation */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .primary-nav {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-surface);
    padding: var(--space-6);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-out);
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .nav-list a {
    font-size: var(--text-lg);
    padding: var(--space-3) 0;
  }

  .nav-cta {
    margin-top: var(--space-4);
    width: 100%;
    text-align: center;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .primary-nav {
    transition: none;
  }
  
  .hamburger,
  .hamburger::before,
  .hamburger::after {
    transition: none;
  }
}