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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid rgba(139, 126, 114, 0.08);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  gap: var(--space-6);
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__name {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: color var(--transition-fast);
}

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

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  letter-spacing: 0.01em;
  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);
  border-radius: 2px;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-primary);
}

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

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: var(--text-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--color-cream);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-cream);
}

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

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
}

.hamburger__line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

/* Mobile Menu Open State */
.mobile-menu-toggle[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .header-container {
    height: 64px;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-surface);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-8) var(--space-6);
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
    box-shadow: var(--shadow-lg);
  }
  
  .main-nav.is-open {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-list {
    flex-direction: column;
    gap: var(--space-6);
    width: 100%;
  }
  
  .nav-link {
    font-size: var(--text-xl);
    padding: var(--space-3) 0;
    width: 100%;
    display: block;
    text-align: center;
  }
  
  .nav-link::after {
    display: none;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .main-nav {
    transition: none;
  }
  
  .hamburger__line {
    transition: none;
  }
}