/* Antonio's SEO Tools - Layout System */
/* Sidebar navigation, containers, and grid layouts */

/* ============================================
   SIDEBAR NAVIGATION
   ============================================ */

.app-sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: var(--border-thin) solid var(--sidebar-border);
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: var(--z-fixed);
  box-shadow: 2px 0 12px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition-base);
}

/* Sidebar Header */
.sidebar-header {
  padding: var(--space-4) var(--space-3);
  border-bottom: var(--border-thin) solid var(--glass-border);
}

.sidebar-logo {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-action);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: var(--transition-all-base);
}

.sidebar-logo:hover {
  color: #1a7fc4;
}

.logo-icon {
  font-size: 1.5rem;
}

/* Sidebar Navigation */
.sidebar-nav {
  padding: var(--space-2) 0;
}

.nav-section {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  padding: var(--space-3) var(--space-3) var(--space-1);
  font-weight: var(--font-weight-semibold);
  margin-top: var(--space-3);
}

.nav-section:first-child {
  margin-top: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  margin: 0 var(--space-2);
  transition: var(--transition-all-base);
  position: relative;
}

.nav-item:hover {
  background: rgba(158, 158, 158, 0.08);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(36, 153, 239, 0.1);
  color: var(--primary-action);
  font-weight: var(--font-weight-semibold);
}

.nav-item-icon {
  width: 20px;
  text-align: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.nav-item-chevron {
  margin-left: auto;
  transition: transform var(--transition-base);
  font-size: 0.75rem;
}

.nav-item-expandable {
  cursor: pointer;
}

.nav-item-chevron.rotate-90 {
  transform: rotate(90deg);
}

/* Submenu */
.nav-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.nav-submenu.open {
  max-height: 500px;
}

.nav-subitem {
  display: block;
  padding: var(--space-2) var(--space-3) var(--space-2) calc(var(--space-3) + 20px + var(--space-2));
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  margin: 0 var(--space-2);
  transition: var(--transition-all-fast);
}

.nav-subitem:hover {
  background: rgba(158, 158, 158, 0.08);
  color: var(--text-primary);
}

.nav-subitem.active {
  color: var(--primary-action);
  font-weight: var(--font-weight-medium);
}

/* ============================================
   MAIN CONTAINER
   ============================================ */

.app-container {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  background: var(--bg-secondary);
  padding: var(--space-4);
}

/* ============================================
   MOBILE NAVIGATION
   ============================================ */

.mobile-menu-toggle {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: calc(var(--z-fixed) + 1);
  background: var(--primary-action);
  color: white;
  border: none;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: none;
  box-shadow: var(--shadow-md);
  transition: var(--transition-all-base);
}

.mobile-menu-toggle:hover {
  background: #1a7fc4;
  transform: scale(1.05);
}

.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-fixed) - 1);
  display: none;
  backdrop-filter: blur(4px);
}

.mobile-overlay.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ============================================
   BREADCRUMB NAVIGATION
   ============================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  color: var(--primary-action);
}

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

/* ============================================
   GRID SYSTEMS
   ============================================ */

/* Workspace Grid (Tool Pages) */
.workspace-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.workspace-primary {
  min-width: 0;
}

.workspace-secondary {
  min-width: 0;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-4);
}

/* Featured Tools Grid */
.tools-showcase {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* Value Props Grid */
.value-props-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  text-align: left;
  margin-top: var(--space-5);
}

/* ============================================
   STICKY ELEMENTS
   ============================================ */

.sticky {
  position: sticky;
  top: var(--space-4);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero-section {
  padding: var(--space-8) var(--space-4);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  text-align: center;
  margin: calc(var(--space-4) * -1);
  margin-bottom: var(--space-6);
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: rgba(36, 153, 239, 0.1);
  border: var(--border-thin) solid rgba(36, 153, 239, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-action);
  margin-bottom: var(--space-3);
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.hero-gradient-text {
  background: linear-gradient(135deg, #2499EF, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-5);
  line-height: var(--line-height-relaxed);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

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

.tool-header {
  background: white;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.tool-header-content {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.tool-icon-badge {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(36, 153, 239, 0.1), rgba(139, 92, 246, 0.1));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
}

.tool-header-text {
  flex: 1;
}

.tool-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0 0 var(--space-1) 0;
  color: var(--text-primary);
}

.tool-tagline {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin: 0;
}

.tool-header-actions {
  display: flex;
  gap: var(--space-2);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
  .app-sidebar {
    transform: translateX(-100%);
  }

  .app-sidebar.open {
    transform: translateX(0);
  }

  .app-container {
    margin-left: 0;
  }

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

  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .tools-showcase {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .tool-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .tool-header-actions {
    width: 100%;
    justify-content: stretch;
  }

  .tool-header-actions .btn {
    flex: 1;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .value-props-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .app-container {
    padding: var(--space-2);
  }

  .hero-section {
    padding: var(--space-6) var(--space-2);
    margin: calc(var(--space-2) * -1);
    margin-bottom: var(--space-4);
  }

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .tool-title {
    font-size: var(--font-size-xl);
  }
}