/* AI Navigator - Custom Styles */

/* Root Variables */
:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --tech-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --dark-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  --card-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  --hover-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  --border-radius: 16px;
}

/* Custom Font */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

body {
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
  min-height: 100vh;
}

/* Hero Section */
.hero-gradient {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  position: relative;
  overflow: hidden;
}

.hero-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* Card Styles */
.tech-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  transition: all 0.3s ease;
}

.tech-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--hover-shadow);
}

/* Gradient Text */
.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* Navigation */
.nav-glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-link {
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Category Cards */
.category-card {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  background: white;
  box-shadow: var(--card-shadow);
  transition: all 0.4s ease;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

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

.category-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: var(--hover-shadow);
}

/* Article Cards */
.article-card {
  background: white;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.article-card img {
  transition: transform 0.4s ease;
}

.article-card:hover img {
  transform: scale(1.05);
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.tag-blue {
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  color: #0369a1;
}

.tag-purple {
  background: linear-gradient(135deg, #f3e8ff 0%, #e9d5ff 100%);
  color: #7c3aed;
}

.tag-green {
  background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
  color: #15803d;
}

.tag-orange {
  background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%);
  color: #c2410c;
}

/* Buttons */
.btn-primary {
  background: var(--primary-gradient);
  color: white;
  padding: 12px 32px;
  border-radius: 12px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
  background: white;
  color: #667eea;
  padding: 12px 32px;
  border-radius: 12px;
  font-weight: 600;
  border: 2px solid #667eea;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: #667eea;
  color: white;
}

/* Section Headers */
.section-header {
  position: relative;
  display: inline-block;
}

.section-header::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--primary-gradient);
  border-radius: 2px;
}

/* Stats */
.stat-card {
  background: white;
  border-radius: 20px;
  padding: 32px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: scale(1.05);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Footer */
.footer-gradient {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f0f23 100%);
}

/* Comparison Table */
.comparison-table {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.comparison-table th {
  background: var(--primary-gradient);
  color: white;
  padding: 16px;
  font-weight: 600;
}

.comparison-table td {
  padding: 16px;
  border-bottom: 1px solid #e2e8f0;
  background: white;
}

.comparison-table tr:hover td {
  background: #f8fafc;
}

/* Rating Stars */
.rating {
  display: flex;
  gap: 4px;
}

.star {
  color: #fbbf24;
}

.star-empty {
  color: #e2e8f0;
}

/* Progress Bars */
.progress-bar {
  height: 8px;
  border-radius: 4px;
  background: #e2e8f0;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  background: var(--primary-gradient);
  transition: width 0.5s ease;
}

/* Floating Elements */
.float-animation {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* Pulse Animation */
.pulse-animation {
  animation: pulse 2s ease-in-out infinite;
}

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

/* Grid Pattern Background */
.grid-bg {
  background-image: 
    linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* Glassmorphism */
.glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Image Container */
.img-container {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
}

.img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.img-container:hover .img-overlay {
  opacity: 1;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #64748b;
}

.breadcrumb a {
  color: #667eea;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: #764ba2;
}

/* TOC Sidebar */
.toc-sidebar {
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc-link {
  display: block;
  padding: 8px 16px;
  color: #64748b;
  border-left: 2px solid #e2e8f0;
  transition: all 0.2s ease;
}

.toc-link:hover,
.toc-link.active {
  color: #667eea;
  border-left-color: #667eea;
  background: rgba(102, 126, 234, 0.05);
}

/* Scroll to Top */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
  cursor: pointer;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  transform: translateY(-4px);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .hero-gradient {
    padding: 60px 20px;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .category-card {
    border-radius: 16px;
  }
}

/* Code Blocks */
.code-block {
  font-family: 'JetBrains Mono', monospace;
  background: #1e293b;
  color: #e2e8f0;
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
}

/* Newsletter Box */
.newsletter-box {
  background: var(--primary-gradient);
  border-radius: 24px;
  padding: 48px;
  position: relative;
  overflow: hidden;
}

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