/* Header and Navigation Styles for PieForge */

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}

/* Brand Logo */
.nav-brand {
  flex-shrink: 0;
}

.brand-logo {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
}

.brand-logo img {
  height: 32px;  /* Minimum 28px per brand bible */
  width: auto;
  display: block;
}

.brand-logo:hover {
  opacity: 0.8;
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-gray-50);
}

.nav-link:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Mobile Menu Toggle */
.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);
}

.menu-icon {
  position: relative;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.menu-icon::before,
.menu-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-fast);
}

.menu-icon::before {
  top: -8px;
}

.menu-icon::after {
  bottom: -8px;
}

/* Mobile Menu Toggle Active State */
.menu-toggle[aria-expanded="true"] .menu-icon {
  background-color: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-icon::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* Mobile Navigation Styles */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
    display: none;
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: var(--space-3);
    text-align: left;
  }
}

/* Ensure focus visibility */
.menu-toggle:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}