/* ============================================
   AI PULSE - Mobile-First Premium Design System
   ============================================ */

/* CSS Custom Properties */
:root {
  /* Color Palette */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);

  --accent: #22d3ee;
  --accent-light: #67e8f9;
  --accent-glow: rgba(34, 211, 238, 0.25);

  --success: #10b981;
  --warning: #f59e0b;

  /* Neutral Colors */
  --dark: #0f172a;
  --dark-soft: #1e293b;
  --dark-medium: #334155;

  --text: #334155;
  --text-light: #64748b;
  --text-muted: #94a3b8;

  --bg: #f8fafc;
  --bg-subtle: #f1f5f9;
  --card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --gradient-mesh: radial-gradient(at 40% 40%, #6366f1 0, transparent 50%),
    radial-gradient(at 90% 10%, #a855f7 0, transparent 40%),
    radial-gradient(at 10% 90%, #22d3ee 0, transparent 40%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);

  /* Spacing - Mobile first */
  --space-2xs: 4px;
  --space-xs: 6px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 40px var(--primary-glow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Safe area for notched phones */
  --safe-top: env(safe-area-inset-top);
  --safe-bottom: env(safe-area-inset-bottom);
  --safe-left: env(safe-area-inset-left);
  --safe-right: env(safe-area-inset-right);
}

/* ============================================
   BASE RESET & FOUNDATION
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Page load animation */
body {
  opacity: 0;
  animation: pageLoad 0.4s ease forwards;
  animation-delay: 0.1s;
}

@keyframes pageLoad {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Container */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  padding-left: max(var(--space-md), var(--safe-left));
  padding-right: max(var(--space-md), var(--safe-right));
}

/* ============================================
   LINKS & BUTTONS
   ============================================ */
a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

/* Ensure touch targets are accessible */
a:not(.featured-title a):not(.post-card-title a):not(.post-content a):not(.site-footer a),
button {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ============================================
   HEADER - Mobile First
   ============================================ */
.site-header {
  background: var(--gradient-primary);
  padding: calc(var(--space-lg) + var(--safe-top)) 0 var(--space-3xl);
  position: relative;
  overflow: hidden;
}

/* Animated mesh background */
.site-header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  bottom: -50%;
  background: var(--gradient-mesh);
  animation: meshFloat 15s ease-in-out infinite;
  opacity: 0.5;
}

@keyframes meshFloat {

  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }

  33% {
    transform: translate(2%, 2%) rotate(1deg);
  }

  66% {
    transform: translate(-1%, 1%) rotate(-0.5deg);
  }
}

/* Subtle pattern overlay */
.site-header::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 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='0.03'%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");
  opacity: 0.6;
}

.site-header .container {
  position: relative;
  z-index: 1;
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  min-height: auto;
}

.site-logo {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
  transition: transform var(--transition-bounce), box-shadow var(--transition-base);
}

.site-brand:hover .site-logo {
  transform: scale(1.05) rotate(3deg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.site-title {
  font-size: clamp(1.35rem, 5vw, 1.85rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
  min-height: auto;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.site-title:hover {
  color: #fff;
}

.site-tagline {
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(0.9rem, 3vw, 1.1rem);
  margin-top: var(--space-xs);
  font-weight: 400;
  max-width: 360px;
  line-height: 1.5;
}

/* Navigation */
.header-nav {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.header-nav a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  font-size: 0.9rem;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: all var(--transition-fast);
  min-height: 44px;
}

.header-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.header-nav a:active {
  transform: scale(0.97);
}

/* ============================================
   HERO SECTION - Featured Post
   ============================================ */
.hero-section {
  margin-top: -40px;
  padding: 0 0 var(--space-lg);
  position: relative;
  z-index: 10;
}

.featured-post {
  background: var(--card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.03);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-slow);
}

.featured-post:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.featured-image {
  height: 160px;
  background-color: var(--dark-soft);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  color: rgba(255, 255, 255, 0.12);
  position: relative;
  overflow: hidden;
}

/* Shimmer effect removed - looked bad over actual images */

.featured-content {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--gradient-primary);
  color: #fff;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  width: fit-content;
  min-height: auto;
  box-shadow: 0 2px 8px var(--primary-glow);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    box-shadow: 0 2px 8px var(--primary-glow);
  }

  50% {
    box-shadow: 0 4px 20px var(--primary-glow);
  }
}

.featured-title {
  font-size: clamp(1.25rem, 5vw, 1.75rem);
  font-weight: 700;
  color: var(--dark);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.featured-title a {
  color: inherit;
  min-height: auto;
  display: block;
  transition: color var(--transition-fast);
}

.featured-title a:hover {
  color: var(--primary);
}

.featured-excerpt {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  padding-top: var(--space-sm);
}

.featured-meta time {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ============================================
   POSTS SECTION
   ============================================ */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--border);
  position: relative;
}

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

.section-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--dark);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.posts-section {
  padding: var(--space-lg) 0 var(--space-2xl);
}

/* ============================================
   POSTS GRID - Mobile First
   ============================================ */
.posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.post-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm), 0 0 0 1px rgba(0, 0, 0, 0.03);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: row;
  position: relative;
}

.post-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 0;
}

.post-card:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: var(--shadow-md), 0 8px 24px -8px var(--primary-glow);
}

.post-card:active {
  transform: scale(0.98);
  transition: transform 100ms ease;
}

.post-card>* {
  position: relative;
  z-index: 1;
}

.post-card-image {
  width: 90px;
  min-width: 90px;
  min-height: 90px;
  background-color: var(--dark-soft);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  position: relative;
  flex-shrink: 0;
}

.post-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.35), rgba(168, 85, 247, 0.35));
}

.post-card-body {
  padding: var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: var(--space-xs);
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
  color: var(--primary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.15);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
}

.post-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
  line-height: 1.4;
}

.post-card-title a {
  color: inherit;
  min-height: auto;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-fast);
}

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

.post-card-excerpt {
  display: none;
}

.post-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: auto;
  padding-top: var(--space-xs);
}

.read-more {
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 44px;
  padding: 0 var(--space-sm);
  margin-right: calc(-1 * var(--space-sm));
  transition: all var(--transition-fast);
}

.read-more:hover {
  gap: 8px;
  color: var(--primary-dark);
}

/* ============================================
   SINGLE POST
   ============================================ */
.post {
  background: var(--card);
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  margin: var(--space-lg) 0;
  overflow: hidden;
}

/* Post Hero Image */
.post-hero-image {
  width: calc(100% + var(--space-lg) * 2);
  height: 250px;
  margin: calc(-1 * var(--space-lg));
  margin-bottom: var(--space-lg);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  background-color: var(--dark-soft);
  position: relative;
}

.post-hero-image::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, var(--card), transparent);
}

.post-header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 2px solid var(--border);
  position: relative;
}

.post-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 80px;
  height: 2px;
  background: var(--gradient-primary);
}

.post-title {
  margin: 0 0 var(--space-md);
  font-size: clamp(1.5rem, 6vw, 2.5rem);
  font-weight: 700;
  color: var(--dark);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.post-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-md);
}

.post-content {
  font-size: clamp(1rem, 2.5vw, 1.1rem);
  color: var(--text);
  line-height: 1.75;
}

.post-content h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  font-size: clamp(1.2rem, 4vw, 1.5rem);
  font-weight: 700;
  color: var(--dark);
  letter-spacing: -0.01em;
}

.post-content h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  font-size: clamp(1.05rem, 3vw, 1.25rem);
  font-weight: 600;
  color: var(--dark);
}

.post-content p {
  margin: var(--space-md) 0;
}

.post-content ul,
.post-content ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-lg);
}

.post-content li {
  margin: var(--space-sm) 0;
}

.post-content blockquote {
  border-left: 4px solid var(--primary);
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(168, 85, 247, 0.04));
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text);
  position: relative;
}

.post-content blockquote::before {
  content: '"';
  position: absolute;
  top: -8px;
  left: 16px;
  font-size: 60px;
  color: var(--primary);
  opacity: 0.15;
  font-family: Georgia, serif;
  line-height: 1;
}

.post-content code {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary-dark);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
  font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
}

.post-content pre {
  background: var(--dark);
  color: #e2e8f0;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: var(--space-lg) 0;
  font-size: 0.875rem;
  -webkit-overflow-scrolling: touch;
}

.post-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.post-content a {
  text-decoration: underline;
  text-decoration-color: var(--primary-light);
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
  min-height: auto;
  transition: text-decoration-color var(--transition-fast);
}

.post-content a:hover {
  text-decoration-color: var(--primary-dark);
}

.post-content strong {
  color: var(--dark);
  font-weight: 600;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
}

/* Sources Section */
.post-sources {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.post-sources h3 {
  font-size: 0.8rem;
  font-weight: 700;
  margin: 0 0 var(--space-md);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.post-sources ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-sources li {
  margin: var(--space-sm) 0;
  font-size: 0.85rem;
  word-break: break-word;
}

.post-sources li a {
  padding: var(--space-xs) 0;
  display: block;
  min-height: 44px;
}

/* Post Navigation */
.post-nav {
  margin-top: var(--space-xl);
  padding-bottom: calc(var(--space-lg) + var(--safe-bottom));
}

.post-nav a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 500;
  padding: var(--space-md) var(--space-lg);
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition-base);
  min-height: 52px;
}

.post-nav a:hover {
  transform: translateX(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--gradient-primary);
  color: rgba(255, 255, 255, 0.95);
  padding: var(--space-2xl) 0;
  padding-bottom: calc(var(--space-2xl) + var(--safe-bottom));
  margin-top: auto;
  position: relative;
  overflow: hidden;
}

.site-footer::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='0.03'%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");
  opacity: 0.6;
}

.site-footer .container {
  position: relative;
  z-index: 1;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
}

.footer-tagline {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
}

.footer-author {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.footer-author-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
}

.footer-author-link {
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  padding: var(--space-xs) var(--space-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-fast);
  min-height: auto;
}

.footer-author-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.footer-links a {
  color: #fff;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.footer-links a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.footer-copyright {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
  padding-top: var(--space-sm);
}

/* No Posts State */
.no-posts {
  text-align: center;
  color: var(--text-muted);
  padding: var(--space-3xl) var(--space-md);
  font-size: 1.1rem;
  background: var(--card);
  border-radius: var(--radius-xl);
  margin: var(--space-lg) 0;
}

/* ============================================
   TABLET BREAKPOINT (600px+)
   ============================================ */
@media (min-width: 600px) {
  :root {
    --space-md: 20px;
    --space-lg: 28px;
    --space-xl: 40px;
  }

  .container {
    padding: 0 var(--space-lg);
    padding-left: max(var(--space-lg), var(--safe-left));
    padding-right: max(var(--space-lg), var(--safe-right));
  }

  .header-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .site-header {
    padding: calc(var(--space-xl) + var(--safe-top)) 0 var(--space-3xl);
  }

  .featured-post {
    flex-direction: row;
    min-height: 280px;
  }

  .featured-image {
    width: 40%;
    height: auto;
    order: 1;
  }

  .featured-content {
    padding: var(--space-xl);
    flex: 1;
    justify-content: center;
  }

  .featured-title {
    font-size: 1.5rem;
  }

  .posts-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }

  .post-card {
    flex-direction: column;
  }

  .post-card-image {
    width: 100%;
    height: 140px;
    min-width: auto;
  }

  .post-card-body {
    padding: var(--space-lg);
    gap: var(--space-sm);
  }

  .post-card-title {
    font-size: 1.05rem;
  }

  .post-card-excerpt {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-light);
    font-size: 0.875rem;
    flex: 1;
  }

  .post-card-meta {
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-light);
  }

  .post {
    padding: var(--space-xl);
  }

  .post-hero-image {
    width: calc(100% + var(--space-xl) * 2);
    height: 320px;
    margin: calc(-1 * var(--space-xl));
    margin-bottom: var(--space-xl);
  }
}

/* ============================================
   DESKTOP BREAKPOINT (900px+)
   ============================================ */
@media (min-width: 900px) {
  :root {
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
  }

  .site-header {
    padding: calc(var(--space-2xl) + var(--safe-top)) 0 80px;
  }

  .site-logo {
    width: 56px;
    height: 56px;
    font-size: 28px;
  }

  .featured-post {
    border-radius: var(--radius-2xl);
    min-height: 360px;
  }

  .featured-image {
    width: 45%;
    font-size: 80px;
  }

  .featured-content {
    padding: var(--space-2xl);
    gap: var(--space-md);
  }

  .featured-title {
    font-size: 1.85rem;
  }

  .featured-excerpt {
    font-size: 1.05rem;
    -webkit-line-clamp: 4;
  }

  .posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .post-card-image {
    height: 160px;
  }

  .post {
    padding: var(--space-2xl);
    margin: var(--space-xl) 0;
  }

  .post-header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
  }

  .post-hero-image {
    width: calc(100% + var(--space-2xl) * 2);
    height: 400px;
    margin: calc(-1 * var(--space-2xl));
    margin-bottom: var(--space-2xl);
  }
}

/* ============================================
   LARGE DESKTOP (1200px+)
   ============================================ */
@media (min-width: 1200px) {
  .container {
    padding: 0 var(--space-xl);
  }

  .featured-content {
    padding: var(--space-2xl) var(--space-3xl);
  }

  .featured-title {
    font-size: 2.25rem;
  }

  .post-card-excerpt {
    -webkit-line-clamp: 3;
  }
}

/* ============================================
   ACCESSIBILITY & REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  body {
    animation: none;
    opacity: 1;
  }
}

/* Focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* High contrast mode support */
@media (forced-colors: active) {

  .featured-badge,
  .tag {
    border: 2px solid currentColor;
  }
}

/* ============================================
   DARK MODE
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0f1a;
    --bg-subtle: #111827;
    --card: #1a2234;
    --text: #e2e8f0;
    --text-light: #94a3b8;
    --text-muted: #64748b;
    --border: #2d3a4f;
    --border-light: #1e293b;
    --dark: #f8fafc;
    --dark-soft: #0a0f1a;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    --primary-glow: rgba(99, 102, 241, 0.25);
  }

  .site-header::before {
    opacity: 0.35;
  }

  .site-header::after {
    opacity: 0.4;
  }

  .post-card-image,
  .featured-image {
    background-color: #0f172a;
  }

  .post-content pre {
    background: #0f172a;
    border: 1px solid var(--border);
  }

  .post-sources {
    background: var(--bg);
    border-color: var(--border);
  }

  .post-content blockquote {
    background: rgba(99, 102, 241, 0.08);
  }

  .featured-excerpt,
  .post-card-excerpt {
    color: var(--text-light);
  }

  .tag {
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.25);
  }

  .post-nav a {
    background: var(--card);
    border-color: var(--border);
  }
}

/* ============================================
   UTILITIES
   ============================================ */
.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;
}

/* Smooth scroll anchor offset */
:target {
  scroll-margin-top: var(--space-xl);
}

/* Selection styling */
::selection {
  background: var(--primary);
  color: white;
}

::-moz-selection {
  background: var(--primary);
  color: white;
}

/* ============================================
   AUTHOR BOX
   ============================================ */
.author-box {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.author-avatar {
  width: 60px;
  height: 60px;
  background: var(--card);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.author-details h3 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 var(--space-xs);
  letter-spacing: 0.5px;
}

.author-details p {
  font-size: 0.95rem;
  margin: 0 0 var(--space-md);
  line-height: 1.6;
}

.author-links {
  display: flex;
  gap: var(--space-md);
}

.author-links a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.author-links a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

@media (max-width: 600px) {
  .author-box {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .author-links {
    justify-content: center;
  }
}

/* ============================================
   SOCIAL SHARE BUTTONS
   ============================================ */
.social-share {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.share-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.share-buttons {
  display: flex;
  gap: var(--space-sm);
}

.share-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: all var(--transition-fast);
  min-height: 44px;
}

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

.share-btn:active {
  transform: scale(0.95);
}

.share-twitter {
  background: #000;
}

.share-twitter:hover {
  background: #333;
  color: #fff;
}

.share-linkedin {
  background: #0077b5;
}

.share-linkedin:hover {
  background: #005885;
  color: #fff;
}

.share-reddit {
  background: #ff4500;
}

.share-reddit:hover {
  background: #cc3700;
  color: #fff;
}

.share-hn {
  background: #ff6600;
}

.share-hn:hover {
  background: #cc5200;
  color: #fff;
}

@media (max-width: 600px) {
  .social-share {
    justify-content: center;
  }

  .share-label {
    width: 100%;
    text-align: center;
  }
}

/* ============================================
   RELATED POSTS
   ============================================ */
.related-posts {
  margin-top: var(--space-xl);
}

.related-posts-header {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.related-post-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: all var(--transition-fast);
}

.related-post-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.related-post-card a {
  display: block;
  min-height: auto;
}

.related-post-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: var(--space-xs);
  line-height: 1.4;
}

.related-post-card:hover .related-post-title {
  color: var(--primary);
}

.related-post-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (min-width: 600px) {
  .related-posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================
   TAG PAGES
   ============================================ */
.tag-link {
  text-decoration: none;
}

.tag-link:hover .tag {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
  transform: translateY(-1px);
}

.tag-page-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.tag-page-title {
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: var(--space-sm);
}

.tag-page-count {
  color: var(--text-muted);
  font-size: 1rem;
}

.tags-page {
  background: var(--card);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  margin: var(--space-lg) 0;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

.tags-list li {
  margin: 0;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
  color: var(--primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.15);
  transition: all var(--transition-fast);
  min-height: 44px;
}

.tag-item:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: var(--primary-dark);
}

.tag-item .tag-count {
  background: var(--primary);
  color: #fff;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

/* ============================================
   SEARCH
   ============================================ */
.search-page {
  background: var(--card);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  margin: var(--space-lg) 0;
}

.search-form {
  margin-bottom: var(--space-xl);
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  padding-left: 48px;
  font-size: 1.1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  color: var(--text);
  transition: all var(--transition-fast);
  font-family: inherit;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  color: var(--text-muted);
  pointer-events: none;
}

.search-results {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.search-result {
  padding: var(--space-lg);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.search-result:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}

.search-result-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: var(--space-xs);
}

.search-result-title a {
  color: inherit;
  min-height: auto;
}

.search-result-title a:hover {
  color: var(--primary);
}

.search-result-excerpt {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.search-result-excerpt mark {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-dark);
  padding: 1px 4px;
  border-radius: 3px;
}

.search-result-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.search-no-results {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}

.search-loading {
  text-align: center;
  padding: var(--space-xl);
  color: var(--text-muted);
}

/* ============================================
   READING PROGRESS BAR
   ============================================ */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-primary);
  z-index: 9999;
  transition: opacity var(--transition-fast);
  opacity: 0;
}

.progress-bar.visible {
  opacity: 1;
}

/* ============================================
   TABLE OF CONTENTS
   ============================================ */
.toc-wrapper {
  margin-bottom: var(--space-xl);
}

.toc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.toc-toggle:hover {
  background: var(--bg);
  border-color: var(--primary);
}

.toc-toggle-icon {
  transition: transform var(--transition-fast);
}

.toc-toggle[aria-expanded="true"] .toc-toggle-icon {
  transform: rotate(180deg);
}

.toc-content {
  display: none;
  padding: var(--space-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.toc-content.open {
  display: block;
}

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

.toc-content li {
  margin: 0;
}

.toc-content a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--text);
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.toc-content a:hover {
  background: var(--card);
  color: var(--primary);
}

.toc-content a.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
  color: var(--primary);
  font-weight: 600;
}

.toc-content ul ul {
  padding-left: var(--space-md);
}

.toc-content ul ul a {
  font-size: 0.85rem;
  padding-left: var(--space-lg);
}

.toc-content .toc-h3 a {
  font-size: 0.85rem;
  padding-left: var(--space-xl);
  color: var(--text-light);
}

/* ============================================
   GOOGLE ADS
   ============================================ */
.ad-container {
  margin: var(--space-xl) 0;
  padding: var(--space-md);
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  min-height: 100px;
}

.ad-container ins {
  display: block;
}

/* Desktop TOC sidebar */
@media (min-width: 1200px) {
  .post-with-toc {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-xl);
    align-items: start;
  }

  .toc-wrapper {
    position: sticky;
    top: var(--space-xl);
    margin-bottom: 0;
  }

  .toc-toggle {
    display: none;
  }

  .toc-content {
    display: block;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    max-height: calc(100vh - var(--space-2xl) * 2);
    overflow-y: auto;
  }

  .toc-content::-webkit-scrollbar {
    width: 4px;
  }

  .toc-content::-webkit-scrollbar-track {
    background: var(--bg-subtle);
  }

  .toc-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
  }
}