/**
 * components/navigation.css
 *
 * RESPONSIBILITY: Navigation and header styles
 * MAX SIZE: 200 lines
 * DEPENDENCIES: _variables.css
 *
 * RULES:
 * - ONLY navigation-related styles (header, nav, etc.)
 * - Use CSS variables for all colors/spacing
 * - Follow naming: .nav-*, .header-*
 *
 * Last Modified: January 2025
 */

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

.header {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

/* nav.js layout classes */
.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo img {
  height: 60px;
  width: auto;
  border-radius: 8px;
}

.header-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.header-nav a {
  color: var(--text-primary, #2c3e50);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.header-nav a:hover {
  color: var(--color-primary, #0777bb);
}

.header-nav a.active {
  color: var(--color-primary, #0777bb);
  font-weight: 600;
}

/* Legacy BEM classes (kept for backward compat) */
.header__nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-4) var(--spacing-6);
}

.header__logo {
  color: var(--text-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  text-decoration: none;
  letter-spacing: -0.02em;
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

/* =============================================================================
   NAVIGATION LINKS
   ============================================================================= */

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  list-style: none;
}

.nav__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav__link.is-active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.nav__link.is-active::after {
  content: '';
  position: absolute;
  bottom: -var(--spacing-4);
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
}

/* =============================================================================
   NAV DROPDOWNS
   ============================================================================= */

.nav-dropdown {
    position: relative;
}

.nav-dropdown-trigger {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    color: var(--text-primary, #2c3e50);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    padding: 8px 4px;
    transition: color 0.2s;
    font-family: inherit;
}

.nav-dropdown-trigger:hover {
    color: var(--color-primary, #0777bb);
}

.nav-dropdown-trigger.active {
    color: var(--color-primary, #0777bb);
    font-weight: 600;
}

.nav-dropdown-arrow {
    transition: transform 0.2s;
    flex-shrink: 0;
}

.nav-dropdown.is-open .nav-dropdown-arrow {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: var(--bg-secondary, #fff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    padding: 6px 0;
    z-index: 200;
    margin-top: 4px;
}

.nav-dropdown.is-open .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-menu a {
    display: block;
    padding: 8px 16px;
    color: var(--text-primary, #2c3e50);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}

.nav-dropdown-menu a:hover {
    background: var(--bg-tertiary, #f1f5f9);
    color: var(--color-primary, #0777bb);
}

.nav-dropdown-menu a.active {
    color: var(--color-primary, #0777bb);
    font-weight: 600;
    background: var(--bg-tertiary, #f1f5f9);
}

/* =============================================================================
   MOBILE HAMBURGER
   ============================================================================= */

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    position: relative;
    width: 36px;
    height: 36px;
}

.nav-hamburger,
.nav-hamburger::before,
.nav-hamburger::after {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary, #2c3e50);
    border-radius: 1px;
    transition: transform 0.3s, opacity 0.3s;
    position: absolute;
    left: 8px;
}

.nav-hamburger {
    top: 50%;
    transform: translateY(-50%);
}

.nav-hamburger::before {
    content: '';
    top: -6px;
}

.nav-hamburger::after {
    content: '';
    top: 6px;
}

.nav-mobile-toggle.is-active .nav-hamburger {
    background: transparent;
}

.nav-mobile-toggle.is-active .nav-hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-mobile-toggle.is-active .nav-hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* =============================================================================
   NAV CTA BUTTON (e.g. "Get API Key")
   ============================================================================= */

.header-nav .nav-cta {
    background: var(--color-primary, #0777bb);
    color: white !important;
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.85rem;
    transition: opacity 0.2s;
}

.header-nav .nav-cta:hover {
    opacity: 0.9;
    color: white !important;
}

/* =============================================================================
   THEME TOGGLE
   ============================================================================= */

.theme-toggle {
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-accent);
  border-color: var(--border-color-hover);
  transform: translateY(-1px);
}

.theme-toggle:active {
  transform: translateY(0);
}

/* =============================================================================
   MOBILE MENU TOGGLE
   ============================================================================= */

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-2);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.5rem;
}

/* =============================================================================
   RESPONSIVE (Mobile)
   ============================================================================= */

@media (max-width: 768px) {
  .header-content {
    padding: 0 16px;
    flex-wrap: wrap;
  }

  .logo img {
    height: 48px;
  }

  .nav-mobile-toggle {
    display: block;
  }

  .header-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 4px;
    padding: 12px 0;
    border-top: 1px solid var(--border-color, #e2e8f0);
  }

  .header-nav.is-mobile-open {
    display: flex;
  }

  .header-nav a {
    font-size: 0.9rem;
  }

  /* Dropdowns expand inline on mobile */
  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0 0 0 16px;
    margin-top: 0;
  }

  .nav-dropdown.is-open .nav-dropdown-menu {
    display: block;
  }

  .nav-dropdown-trigger {
    width: 100%;
    text-align: left;
    padding: 10px 4px;
  }

  .header__nav {
    padding: var(--spacing-3) var(--spacing-4);
  }

  .theme-toggle {
    font-size: 1.2rem;
    padding: var(--spacing-2) var(--spacing-3);
  }
}

/* =============================================================================
   BREADCRUMBS
   ============================================================================= */

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-4) 0;
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.breadcrumbs__link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.breadcrumbs__separator {
  color: var(--text-tertiary);
}

.breadcrumbs__current {
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
}

/* =============================================================================
   NAV AUTH (Sign in / user greeting / Sign out in header-nav)
   ============================================================================= */

.header-nav .nav-user-greeting {
    font-size: 0.85rem;
    color: var(--text-secondary, #666);
    font-weight: 500;
    white-space: nowrap;
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-nav .nav-sign-out {
    font-size: 0.8rem;
    color: var(--text-tertiary, #999);
    text-decoration: none;
    transition: color 0.2s;
}

.header-nav .nav-sign-out:hover {
    color: var(--text-primary, #333);
}

@media (max-width: 768px) {
    .header-nav .nav-user-greeting {
        max-width: 100px;
        font-size: 0.75rem;
    }
}

/* =============================================================================
   AUTH SECTION (legacy page-level auth)
   ============================================================================= */

#auth-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.user-email {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Responsive auth section */
@media (max-width: 768px) {
  .user-email {
    max-width: 120px;
    font-size: 0.75rem;
  }

  #auth-section .btn {
    font-size: 0.85rem;
    padding: 6px 12px;
  }
}