/* =============================================================================
   WeDaita News & Blog Enhanced Styles - Modern AI/Data Platform Design
   Optimized for professional AI/data science audience
   ============================================================================= */

/* CSS Custom Properties - Design System */
:root {
  /* Modern AI/Data Color Palette */
  --color-primary: #1e3a8a;        /* Deep Tech Blue */
  --color-primary-light: #3b82f6;   /* Lighter blue for hover states */
  --color-secondary: #6366f1;       /* Neural Purple */
  --color-accent: #059669;          /* Data Green */
  --color-warning: #ea580c;         /* AI Orange */
  
  /* Neutral Palette */
  --color-slate-900: #0f172a;       /* Primary text */
  --color-slate-700: #334155;       /* Secondary text */
  --color-slate-500: #64748b;       /* Muted text */
  --color-slate-400: #94a3b8;       /* Light muted */
  --color-slate-200: #e2e8f0;       /* Borders */
  --color-slate-100: #f1f5f9;       /* Light backgrounds */
  --color-white: #ffffff;
  
  /* Gradients */
  --gradient-blog: linear-gradient(135deg, #1e3a8a 0%, #6366f1 100%);
  --gradient-news: linear-gradient(135deg, #059669 0%, #34d399 100%);
  --gradient-card-hover: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(30, 58, 138, 0.05) 100%);
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
  
  /* Type Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.2s ease-out;
  --transition-slow: 0.3s ease-out;
}

/* Base Typography Improvements - exclude navbar to maintain consistency */
body {
  font-family: var(--font-family-primary);
  color: var(--color-slate-700);
  line-height: 1.7;
}

/* Reset navbar to use Bootstrap default fonts for consistency across pages */
.navbar,
.navbar-nav,
.navbar-brand,
.nav-link,
.dropdown-menu {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif !important;
  line-height: 1.5 !important;
}

/* Enhanced Hero Sections */
#news-hero, #blog-hero {
  background: var(--gradient-news);
  position: relative;
  overflow: hidden;
  padding: var(--space-16) 0;
}

#blog-hero {
  background: var(--gradient-blog);
}

/* Add subtle pattern overlay */
#news-hero::before, #blog-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="40" height="40" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="smallGrid" width="8" height="8" patternUnits="userSpaceOnUse"><path d="M 8 0 L 0 0 0 8" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></pattern></defs><rect width="100%" height="100%" fill="url(%23smallGrid)" /></svg>') repeat;
  opacity: 0.3;
  pointer-events: none;
}

.news-hero-content h1,
.blog-hero-content h1 {
  font-size: var(--text-4xl);
  font-weight: 800;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  letter-spacing: -0.025em;
  margin-bottom: var(--space-6);
}

.news-hero-content .lead,
.blog-hero-content .lead {
  font-size: var(--text-xl);
  line-height: 1.7;
  font-weight: 400;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
  opacity: 0.95;
}

/* Enhanced Statistics in Blog Hero */
.blog-stats {
  margin-top: var(--space-12);
}

.stat-item {
  text-align: center;
  color: white;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.15);
}

.stat-number {
  font-size: var(--text-3xl);
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  letter-spacing: -0.025em;
}

.stat-label {
  font-size: var(--text-sm);
  opacity: 0.9;
  margin-top: var(--space-1);
  font-weight: 500;
}

/* Modern Card Design */
.news-article-card, .blog-post-card {
  border: none;
  border-radius: var(--radius-xl);
  transition: all var(--transition-slow);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: relative;
}

.news-article-card::before, .blog-post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-news);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.blog-post-card::before {
  background: var(--gradient-blog);
}

.news-article-card:hover, .blog-post-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.news-article-card:hover::before, .blog-post-card:hover::before {
  opacity: 1;
}

/* Enhanced Image Containers */
.news-image-container, .blog-image-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.news-card-img, .blog-card-img {
  height: 220px;
  object-fit: cover;
  transition: all var(--transition-slow);
  width: 100%;
}

.news-card-placeholder, .blog-card-placeholder {
  height: 220px;
  background: linear-gradient(135deg, var(--color-slate-100) 0%, var(--color-slate-200) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.news-card-placeholder::after, .blog-card-placeholder::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.1);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.1); }
}

.news-article-card:hover .news-card-img,
.blog-post-card:hover .blog-card-img {
  transform: scale(1.08);
}

/* Modern Badge System */
.news-category-badge, .blog-category-badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 10;
}

.news-category-badge .badge, .blog-category-badge .badge {
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-slate-700);
  font-weight: 600;
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-sm);
}

/* Enhanced Typography in Cards */
.news-title-link, .blog-title-link {
  color: var(--color-slate-900);
  font-weight: 700;
  font-size: var(--text-xl);
  line-height: 1.4;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.news-title-link:hover {
  color: var(--color-accent);
}

.blog-title-link:hover {
  color: var(--color-primary);
}

.news-summary, .post-summary {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-slate-500);
  margin-top: var(--space-3);
}

/* Post Meta Information */
.post-meta, .news-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.post-meta small, .news-meta small {
  color: var(--color-slate-400);
  font-size: var(--text-sm);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Enhanced Tag System */
.post-tags .badge, .news-tags .badge {
  background: var(--color-slate-100);
  color: var(--color-slate-600);
  border: 1px solid var(--color-slate-200);
  font-weight: 500;
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin-right: var(--space-2);
  transition: all var(--transition-fast);
}

.post-tags .badge:hover, .news-tags .badge:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* Code Preview Enhancement */
.code-preview-container {
  background: var(--color-slate-900);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: var(--space-4);
  box-shadow: var(--shadow-md);
}

.code-header {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-slate-400);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.code-snippet {
  background: var(--color-slate-900);
  color: #e2e8f0;
  padding: var(--space-4);
  margin: 0;
  font-family: var(--font-family-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}

/* Enhanced Filters Section */
#news-filters, .blog-filters {
  background: linear-gradient(to bottom, var(--color-white), var(--color-slate-50));
  border-bottom: 1px solid var(--color-slate-200);
  padding: var(--space-6) 0;
}

.blog-filters .card {
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  background: var(--color-white);
}

.news-filter-form select,
.news-filter-form input,
.blog-filter-form select,
.blog-filter-form input {
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-4);
  font-weight: 500;
  background: var(--color-white);
  color: var(--color-slate-700);
  transition: all var(--transition-fast);
}

.news-filter-form select:focus,
.news-filter-form input:focus,
.blog-filter-form select:focus,
.blog-filter-form input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

/* Enhanced Button Styles */
.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Button styling - ONLY for blog/news hero content, NOT navbar */
.blog-hero .btn-outline-light,
.news-hero .btn-outline-light,
.hero-section .btn-outline-light {
  border-color: rgba(255, 255, 255, 0.3);
  color: white;
  font-weight: 600;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
}

.blog-hero .btn-outline-light:hover,
.news-hero .btn-outline-light:hover,
.hero-section .btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  color: white;
}

/* Enhanced Sidebar */
.blog-sidebar .card {
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  background: var(--color-white);
  overflow: hidden;
}

.blog-sidebar .card-header {
  background: linear-gradient(135deg, var(--color-slate-50) 0%, var(--color-slate-100) 100%);
  border-bottom: 1px solid var(--color-slate-200);
  font-weight: 700;
  color: var(--color-slate-900);
  padding: var(--space-4) var(--space-6);
}

.category-list .category-link {
  padding: var(--space-3) var(--space-6);
  border-bottom: 1px solid var(--color-slate-100);
  transition: all var(--transition-fast);
  color: var(--color-slate-600);
  font-weight: 500;
}

.category-list .category-link:hover {
  background: var(--gradient-card-hover);
  color: var(--color-primary);
  padding-left: calc(var(--space-6) + var(--space-2));
  text-decoration: none;
}

/* Author Profile Enhancements */
.author-info, .news-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.author-info img {
  border-radius: 50%;
  border: 2px solid var(--color-slate-200);
  transition: border-color var(--transition-fast);
}

.author-info:hover img {
  border-color: var(--color-primary);
}

/* Newsletter Section Enhancement */
.newsletter-form {
  background: var(--color-white);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.newsletter-form .input-group {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: none;
}

.newsletter-form .form-control {
  border: none;
  font-size: var(--text-base);
  padding: var(--space-4);
  background: transparent;
}

.newsletter-form .btn {
  border: none;
  font-weight: 700;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-4) var(--space-6);
  transition: all var(--transition-fast);
}

.newsletter-form .btn:hover {
  background: var(--color-primary-light);
  transform: translateX(-2px);
}

/* Enhanced Pagination */
.pagination .page-link {
  color: var(--color-slate-600);
  background: var(--color-white);
  border: 1px solid var(--color-slate-200);
  padding: var(--space-3) var(--space-4);
  margin: 0 var(--space-1);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.pagination .page-item.active .page-link {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.pagination .page-link:hover {
  background: var(--color-slate-100);
  border-color: var(--color-slate-300);
  color: var(--color-slate-700);
  transform: translateY(-1px);
}

/* Loading States */
.loading-skeleton {
  background: linear-gradient(90deg, var(--color-slate-100) 25%, var(--color-slate-200) 50%, var(--color-slate-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 2s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Responsive Enhancements */
@media (max-width: 768px) {
  :root {
    --text-4xl: 2rem;
    --text-3xl: 1.5rem;
    --space-16: 2rem;
    --space-12: 2rem;
  }
  
  .news-hero-content h1,
  .blog-hero-content h1 {
    font-size: var(--text-3xl);
  }
  
  .stat-item {
    padding: var(--space-4);
    margin-bottom: var(--space-4);
  }
  
  .news-article-card, .blog-post-card {
    margin-bottom: var(--space-6);
  }
  
  .blog-post-card .row {
    flex-direction: column;
  }
  
  .blog-card-img, .news-card-img {
    height: 200px;
    width: 100%;
  }
}

/* Dark Mode Support (Optional) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-slate-900: #f1f5f9;
    --color-slate-700: #e2e8f0;
    --color-slate-500: #94a3b8;
    --color-slate-400: #64748b;
    --color-slate-200: #334155;
    --color-slate-100: #1e293b;
    --color-white: #0f172a;
  }
}

/* Accessibility Improvements */
.news-title-link:focus,
.blog-title-link:focus,
.category-link:focus,
.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(30, 58, 138, 0.1);
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .news-article-card, .blog-post-card {
    border: 2px solid var(--color-slate-900);
  }
  
  .badge {
    border: 1px solid var(--color-slate-900);
  }
  
  .btn {
    border: 2px solid currentColor;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print Styles */
@media print {
  .news-article-card, .blog-post-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--color-slate-300);
  }
  
  .newsletter-form, .sharing-buttons, .comments-section {
    display: none;
  }
  
  .news-hero-content, .blog-hero-content {
    color: var(--color-slate-900) !important;
  }
}