/* Header Layout */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  z-index: 101;
}

.header__logo-text {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-charcoal);
  letter-spacing: var(--tracking-tight);
}

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

/* Mobile Navigation (Default) */
.header__nav {
  display: none;
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-surface);
  padding: var(--space-8) var(--container-padding);
  overflow-y: auto;
}

.header__nav.is-active {
  display: block;
}

.header__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  list-style: none;
}

.header__nav-item {
  text-align: center;
}

.header__nav-item .nav-link {
  font-size: var(--text-lg);
  padding: var(--space-2) 0;
}

/* Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  z-index: 101;
}

.header__icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-charcoal);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
}

.header__icon-btn:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-subtle);
}

/* Mobile Toggle Button */
.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 101;
  padding: var(--space-2);
}

.header__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-charcoal);
  transition: all var(--transition-base);
  transform-origin: center;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(1) {
  transform: translateY(8px) 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(-8px) rotate(-45deg);
}

/* Desktop Navigation */
@media (min-width: 1024px) {
  .header__toggle {
    display: none;
  }
  
  .header__nav {
    display: block !important;
    position: static;
    padding: 0;
    background: transparent;
    overflow: visible;
  }
  
  .header__nav-list {
    flex-direction: row;
    gap: var(--space-8);
    align-items: center;
  }
  
  .header__nav-item .nav-link {
    font-size: var(--text-sm);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .header__toggle-bar,
  .header__icon-btn,
  .header__logo {
    transition: none;
  }
}