/* BlogIA Pro Styles - Professional 2025/2026 Design
 * Modern, high-converting design optimized for AdSense
 * Mobile-first, accessible, performance-focused
 */

/* ============================================
   1. CSS CUSTOM PROPERTIES
   ============================================ */
:root {
  /* Brand Colors */
  --blogia-primary: #3b82f6;
  --blogia-primary-hover: #2563eb;
  --blogia-primary-light: #dbeafe;
  --blogia-primary-dark: #1e40af;
  
  /* Semantic Colors */
  --blogia-success: #10b981;
  --blogia-warning: #f59e0b;
  --blogia-danger: #ef4444;
  --blogia-info: #8b5cf6;
  
  /* Neutral Scale */
  --blogia-gray-50: #f9fafb;
  --blogia-gray-100: #f3f4f6;
  --blogia-gray-200: #e5e7eb;
  --blogia-gray-300: #d1d5db;
  --blogia-gray-400: #9ca3af;
  --blogia-gray-500: #6b7280;
  --blogia-gray-600: #4b5563;
  --blogia-gray-700: #374151;
  --blogia-gray-800: #1f2937;
  --blogia-gray-900: #111827;
  
  /* Gradients */
  --blogia-gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --blogia-gradient-hero: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #60a5fa 100%);
  --blogia-gradient-dark: linear-gradient(180deg, #111827 0%, #1f2937 100%);
  --blogia-gradient-mesh: radial-gradient(at 40% 20%, #3b82f6 0px, transparent 50%),
                          radial-gradient(at 80% 0%, #8b5cf6 0px, transparent 50%),
                          radial-gradient(at 0% 50%, #10b981 0px, transparent 50%);
  
  /* Typography */
  --blogia-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --blogia-font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --blogia-font-display: 'Inter', var(--blogia-font-sans);
  
  /* Spacing */
  --blogia-space-xs: 0.25rem;
  --blogia-space-sm: 0.5rem;
  --blogia-space-md: 1rem;
  --blogia-space-lg: 1.5rem;
  --blogia-space-xl: 2rem;
  --blogia-space-2xl: 3rem;
  --blogia-space-3xl: 4rem;
  
  /* Borders & Shadows */
  --blogia-radius-sm: 6px;
  --blogia-radius-md: 10px;
  --blogia-radius-lg: 16px;
  --blogia-radius-xl: 24px;
  --blogia-radius-full: 9999px;
  
  --blogia-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --blogia-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --blogia-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --blogia-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --blogia-shadow-glow: 0 0 40px -10px var(--blogia-primary);
  
  /* Transitions */
  --blogia-transition-fast: 150ms ease;
  --blogia-transition-base: 200ms ease;
  --blogia-transition-slow: 300ms ease;
  
  /* Z-index scale */
  --blogia-z-dropdown: 1000;
  --blogia-z-sticky: 1020;
  --blogia-z-fixed: 1030;
  --blogia-z-modal: 1050;
  --blogia-z-tooltip: 1070;
}

/* Dark mode */
.dark {
  --blogia-gray-50: #111827;
  --blogia-gray-100: #1f2937;
  --blogia-gray-200: #374151;
  --blogia-gray-300: #4b5563;
  --blogia-gray-400: #6b7280;
  --blogia-gray-500: #9ca3af;
  --blogia-gray-600: #d1d5db;
  --blogia-gray-700: #e5e7eb;
  --blogia-gray-800: #f3f4f6;
  --blogia-gray-900: #f9fafb;
  --blogia-primary-light: #1e3a8a;
}

/* ============================================
   2. BASE STYLES
   ============================================ */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--blogia-font-sans);
  line-height: 1.7;
  color: var(--blogia-gray-800);
  background: var(--blogia-gray-50);
}

.dark body {
  background: var(--blogia-gray-900);
  color: var(--blogia-gray-100);
}

/* ============================================
   3. HERO SECTION
   ============================================ */
.hero-section {
  position: relative;
  padding: var(--blogia-space-3xl) var(--blogia-space-lg);
  background: var(--blogia-gradient-hero);
  color: white;
  overflow: hidden;
  min-height: 400px;
  display: flex;
  align-items: center;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--blogia-gradient-mesh);
  opacity: 0.3;
  pointer-events: none;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(to top, var(--blogia-gray-50), transparent);
}

.dark .hero-section::after {
  background: linear-gradient(to top, var(--blogia-gray-900), transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--blogia-space-lg);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero-title .gradient-text {
  background: linear-gradient(90deg, #fff 0%, #60a5fa 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  opacity: 0.9;
  margin-bottom: var(--blogia-space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--blogia-space-xl);
  flex-wrap: wrap;
  margin-top: var(--blogia-space-xl);
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-size: 2rem;
  font-weight: 700;
  display: block;
}

.hero-stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ============================================
   4. PROFESSIONAL CARDS
   ============================================ */
.pro-card {
  background: white;
  border: 1px solid var(--blogia-gray-200);
  border-radius: var(--blogia-radius-lg);
  padding: var(--blogia-space-lg);
  transition: all var(--blogia-transition-base);
  position: relative;
  overflow: hidden;
}

.dark .pro-card {
  background: var(--blogia-gray-800);
  border-color: var(--blogia-gray-700);
}

.pro-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--blogia-shadow-xl);
  border-color: var(--blogia-primary);
}

.pro-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--blogia-gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--blogia-transition-base);
}

.pro-card:hover::before {
  transform: scaleX(1);
}

.pro-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--blogia-radius-md);
  margin-bottom: var(--blogia-space-md);
}

.pro-card-category {
  display: inline-flex;
  align-items: center;
  gap: var(--blogia-space-xs);
  padding: var(--blogia-space-xs) var(--blogia-space-sm);
  background: var(--blogia-primary-light);
  color: var(--blogia-primary-dark);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--blogia-radius-full);
  margin-bottom: var(--blogia-space-sm);
}

.pro-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--blogia-space-sm);
  color: var(--blogia-gray-900);
}

.dark .pro-card-title {
  color: white;
}

.pro-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--blogia-transition-fast);
}

.pro-card-title a:hover {
  color: var(--blogia-primary);
}

.pro-card-excerpt {
  color: var(--blogia-gray-600);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: var(--blogia-space-md);
}

.pro-card-meta {
  display: flex;
  align-items: center;
  gap: var(--blogia-space-md);
  font-size: 0.8125rem;
  color: var(--blogia-gray-500);
}

.pro-card-meta-item {
  display: flex;
  align-items: center;
  gap: var(--blogia-space-xs);
}

/* Card Grid */
.pro-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--blogia-space-xl);
}

/* Featured Card (larger) */
.pro-card-featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--blogia-space-lg);
}

@media (max-width: 768px) {
  .pro-card-featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
}

/* ============================================
   5. PROFESSIONAL BUTTONS
   ============================================ */
.btn-pro {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--blogia-space-sm);
  padding: var(--blogia-space-sm) var(--blogia-space-lg);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--blogia-radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--blogia-transition-base);
  text-decoration: none;
}

.btn-pro-primary {
  background: var(--blogia-gradient-primary);
  color: white;
  box-shadow: var(--blogia-shadow-md), 0 0 0 0 var(--blogia-primary);
}

.btn-pro-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--blogia-shadow-lg), 0 0 20px -5px var(--blogia-primary);
}

.btn-pro-secondary {
  background: white;
  color: var(--blogia-gray-700);
  border: 2px solid var(--blogia-gray-300);
}

.btn-pro-secondary:hover {
  border-color: var(--blogia-primary);
  color: var(--blogia-primary);
}

.btn-pro-ghost {
  background: transparent;
  color: var(--blogia-primary);
}

.btn-pro-ghost:hover {
  background: var(--blogia-primary-light);
}

/* ============================================
   6. READING PROGRESS BAR
   ============================================ */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--blogia-gray-200);
  z-index: var(--blogia-z-fixed);
}

.reading-progress-bar {
  height: 100%;
  background: var(--blogia-gradient-primary);
  width: 0%;
  transition: width 50ms linear;
}

/* ============================================
   7. TABLE OF CONTENTS (STICKY)
   ============================================ */
.toc-sticky {
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 150px);
  overflow-y: auto;
  padding: var(--blogia-space-lg);
  background: var(--blogia-gray-100);
  border-radius: var(--blogia-radius-lg);
  border-left: 3px solid var(--blogia-primary);
}

.dark .toc-sticky {
  background: var(--blogia-gray-800);
}

.toc-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blogia-gray-500);
  margin-bottom: var(--blogia-space-md);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: var(--blogia-space-sm);
}

.toc-list a {
  display: block;
  padding: var(--blogia-space-xs) 0;
  color: var(--blogia-gray-600);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all var(--blogia-transition-fast);
  border-left: 2px solid transparent;
  padding-left: var(--blogia-space-sm);
  margin-left: -3px;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--blogia-primary);
  border-left-color: var(--blogia-primary);
}

.toc-list a.active {
  font-weight: 600;
}

/* ============================================
   8. CODE BLOCKS
   ============================================ */
.code-block-wrapper {
  position: relative;
  margin: var(--blogia-space-lg) 0;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--blogia-space-sm) var(--blogia-space-md);
  background: var(--blogia-gray-800);
  border-radius: var(--blogia-radius-md) var(--blogia-radius-md) 0 0;
  border-bottom: 1px solid var(--blogia-gray-700);
}

.code-block-lang {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--blogia-gray-400);
  text-transform: uppercase;
}

.code-copy-btn {
  display: flex;
  align-items: center;
  gap: var(--blogia-space-xs);
  padding: var(--blogia-space-xs) var(--blogia-space-sm);
  background: var(--blogia-gray-700);
  color: var(--blogia-gray-300);
  border: none;
  border-radius: var(--blogia-radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--blogia-transition-fast);
}

.code-copy-btn:hover {
  background: var(--blogia-primary);
  color: white;
}

.code-copy-btn.copied {
  background: var(--blogia-success);
  color: white;
}

pre.highlight {
  margin: 0;
  padding: var(--blogia-space-lg);
  background: var(--blogia-gray-900);
  border-radius: 0 0 var(--blogia-radius-md) var(--blogia-radius-md);
  overflow-x: auto;
  font-family: var(--blogia-font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ============================================
   9. SIDEBAR COMPONENTS
   ============================================ */
.sidebar-widget {
  background: white;
  border: 1px solid var(--blogia-gray-200);
  border-radius: var(--blogia-radius-lg);
  padding: var(--blogia-space-lg);
  margin-bottom: var(--blogia-space-lg);
}

.dark .sidebar-widget {
  background: var(--blogia-gray-800);
  border-color: var(--blogia-gray-700);
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--blogia-space-md);
  padding-bottom: var(--blogia-space-sm);
  border-bottom: 2px solid var(--blogia-primary);
}

/* Popular Posts Widget */
.popular-post-item {
  display: flex;
  gap: var(--blogia-space-md);
  padding: var(--blogia-space-sm) 0;
  border-bottom: 1px solid var(--blogia-gray-100);
}

.dark .popular-post-item {
  border-color: var(--blogia-gray-700);
}

.popular-post-item:last-child {
  border-bottom: none;
}

.popular-post-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blogia-primary-light);
  color: var(--blogia-primary);
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--blogia-radius-sm);
}

.popular-post-title {
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
}

.popular-post-title a {
  color: var(--blogia-gray-700);
  text-decoration: none;
}

.popular-post-title a:hover {
  color: var(--blogia-primary);
}

/* ============================================
   10. SHARE BUTTONS
   ============================================ */
.share-buttons {
  display: flex;
  gap: var(--blogia-space-sm);
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--blogia-radius-md);
  color: white;
  text-decoration: none;
  transition: all var(--blogia-transition-base);
}

.share-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--blogia-shadow-md);
}

.share-btn-twitter { background: #1da1f2; }
.share-btn-linkedin { background: #0a66c2; }
.share-btn-facebook { background: #1877f2; }
.share-btn-reddit { background: #ff4500; }
.share-btn-copy { background: var(--blogia-gray-600); }

/* Floating Share Bar */
.share-floating {
  position: fixed;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--blogia-space-sm);
  z-index: var(--blogia-z-sticky);
}

@media (max-width: 1200px) {
  .share-floating {
    display: none;
  }
}

/* ============================================
   11. NEWSLETTER CTA
   ============================================ */
.newsletter-cta {
  background: var(--blogia-gradient-primary);
  border-radius: var(--blogia-radius-xl);
  padding: var(--blogia-space-2xl);
  color: white;
  text-align: center;
  margin: var(--blogia-space-2xl) 0;
  position: relative;
  overflow: hidden;
}

.newsletter-cta::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.newsletter-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--blogia-space-sm);
}

.newsletter-subtitle {
  opacity: 0.9;
  margin-bottom: var(--blogia-space-lg);
}

.newsletter-form {
  display: flex;
  gap: var(--blogia-space-sm);
  max-width: 450px;
  margin: 0 auto;
}

.newsletter-input {
  flex: 1;
  padding: var(--blogia-space-sm) var(--blogia-space-md);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--blogia-radius-md);
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 1rem;
}

.newsletter-input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.newsletter-input:focus {
  outline: none;
  border-color: white;
  background: rgba(255, 255, 255, 0.2);
}

.newsletter-btn {
  padding: var(--blogia-space-sm) var(--blogia-space-lg);
  background: white;
  color: var(--blogia-primary);
  border: none;
  border-radius: var(--blogia-radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--blogia-transition-base);
}

.newsletter-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--blogia-shadow-lg);
}

/* ============================================
   12. FOOTER
   ============================================ */
.footer-pro {
  background: var(--blogia-gray-900);
  color: var(--blogia-gray-300);
  padding: var(--blogia-space-3xl) var(--blogia-space-lg) var(--blogia-space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--blogia-space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.footer-brand {
  grid-column: span 2;
}

@media (max-width: 768px) {
  .footer-brand {
    grid-column: span 1;
  }
}

.footer-brand-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--blogia-space-sm);
}

.footer-brand-desc {
  font-size: 0.9375rem;
  line-height: 1.6;
  max-width: 300px;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--blogia-space-md);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--blogia-space-sm);
}

.footer-links a {
  color: var(--blogia-gray-400);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color var(--blogia-transition-fast);
}

.footer-links a:hover {
  color: var(--blogia-primary-light);
}

.footer-bottom {
  border-top: 1px solid var(--blogia-gray-800);
  margin-top: var(--blogia-space-2xl);
  padding-top: var(--blogia-space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--blogia-space-md);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--blogia-gray-500);
}

.footer-social {
  display: flex;
  gap: var(--blogia-space-sm);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--blogia-gray-800);
  color: var(--blogia-gray-400);
  border-radius: var(--blogia-radius-md);
  transition: all var(--blogia-transition-fast);
}

.footer-social a:hover {
  background: var(--blogia-primary);
  color: white;
}

/* ============================================
   13. AD SLOTS (AdSense Ready)
   ============================================ */
.ad-slot {
  background: var(--blogia-gray-100);
  border: 1px dashed var(--blogia-gray-300);
  border-radius: var(--blogia-radius-md);
  padding: var(--blogia-space-md);
  text-align: center;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blogia-gray-400);
  font-size: 0.75rem;
}

.dark .ad-slot {
  background: var(--blogia-gray-800);
  border-color: var(--blogia-gray-700);
}

.ad-slot-horizontal {
  height: 90px;
  margin: var(--blogia-space-lg) 0;
}

.ad-slot-vertical {
  min-height: 250px;
}

.ad-slot-in-content {
  margin: var(--blogia-space-xl) 0;
}

/* ============================================
   14. ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.5s ease forwards;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* Skeleton loading */
.skeleton {
  background: linear-gradient(90deg, var(--blogia-gray-200) 25%, var(--blogia-gray-100) 50%, var(--blogia-gray-200) 75%);
  background-size: 2000px 100%;
  animation: shimmer 2s infinite linear;
  border-radius: var(--blogia-radius-sm);
}

/* ============================================
   15. UTILITY CLASSES
   ============================================ */
.container-pro {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--blogia-space-lg);
}

.text-gradient {
  background: var(--blogia-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--blogia-primary);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .reading-progress,
  .share-floating,
  .ad-slot,
  .newsletter-cta {
    display: none !important;
  }
}