/* Navigation Component - CF Workers Design System
   Reference: frosted glass header, h-16 (64px), border-b border-border/50 */

.navbar {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: transparent;
  border-bottom: none;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--layout-max-width);
  margin: 0 auto;
  padding: 1.25rem var(--space-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--cf-text);
  text-decoration: none;
  transition: color var(--duration-normal) var(--ease-default);
}

.nav-logo svg {
  height: 24px;
  width: auto;
  transition: opacity var(--duration-normal) var(--ease-default);
}

.nav-logo img {
  height: 24px;
  transition:
    opacity var(--duration-normal) var(--ease-default),
    filter var(--duration-normal) var(--ease-default);
}

.nav-logo:hover svg,
.nav-logo:hover img {
  opacity: 0.8;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-menu-toggle {
  display: none;
}

/* Nav Actions (theme toggle + mobile menu) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: transparent;
  border: 1px solid var(--cf-border);
  border-radius: var(--radius-pill);
  color: var(--cf-text-muted);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-default);
}

.theme-toggle:hover {
  background-color: var(--cf-orange-light);
  border-color: var(--cf-orange);
  color: var(--cf-orange);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-container {
    padding: 1.25rem var(--space-6);
  }

  .nav-logo {
    font-size: var(--text-sm);
    gap: var(--space-2);
  }

  .nav-logo svg {
    height: 20px;
  }

  .nav-logo img {
    height: 20px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 251, 245, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--cf-border-50);
    border-bottom: 1px solid var(--cf-border-50);
    padding: var(--space-4);
    flex-direction: column;
    gap: var(--space-2);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.active {
    display: flex;
  }

  .theme-toggle {
    width: 32px;
    height: 32px;
    font-size: var(--text-sm);
  }

  /* Mobile menu toggle */
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    border: 1px solid var(--cf-border);
    border-radius: var(--radius-lg);
    color: var(--cf-text);
    font-size: var(--text-lg);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-default);
  }

  .mobile-menu-toggle:hover {
    background-color: var(--cf-orange-light);
    border-color: var(--cf-orange);
  }
}

/* Hide mobile toggle on desktop */
@media (min-width: 769px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Always transparent — white elements over hero/content */
.nav-logo {
  color: white;
}

.nav-logo img {
  filter: brightness(0) invert(1);
}

.theme-toggle {
  background: white;
  border-color: white;
  color: var(--cf-orange);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.9);
  color: var(--cf-orange);
}

.mobile-menu-toggle {
  border-color: rgba(255, 255, 255, 0.6);
  color: white;
}

/* ── Dark variant (light bg pages: lab pages) ───────────────── */
.navbar--dark .nav-logo {
  color: var(--cf-text);
}

.navbar--dark .nav-logo img {
  filter: none;
}

.navbar--dark .mobile-menu-toggle {
  border-color: var(--cf-border);
  color: var(--cf-text);
}

.navbar--dark .btn-primary {
  background: var(--cf-orange);
  border-color: var(--cf-orange);
  color: white;
}

.navbar--dark .btn-primary:hover {
  background: var(--cf-orange-dark);
  border-color: var(--cf-orange-dark);
  color: white;
}

/* Nav link buttons — scoped to navbar to avoid overriding global .btn-primary styles */
.navbar .btn-primary {
  background: white;
  border-color: white;
  color: var(--cf-orange);
  padding: 0.625rem 1.5rem;
  font-size: 0.9375rem;
}

.navbar .btn-primary:hover {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(255, 255, 255, 0.9);
  color: var(--cf-orange);
}

@media (max-width: 768px) {
  html.dark .nav-menu {
    background: rgba(10, 10, 10, 0.95);
  }
}