/* === BLOG DESIGN SYSTEM - Unified with Homepage === */
:root {
  /* Background Scale - Consistent with Homepage */
  --bg: #06080d;
  --surface: #0c1017;
  --surface-2: #141922;
  --bg-elevated: #1a202e;

  /* Text Scale */
  --ink: #f1f5f9;
  --muted: #94a3b8;
  --text-muted: #64748b;

  /* Accent Colors */
  --accent: #00d4ff;
  --accent-2: #8b5cf6;
  --accent-green: #22c55e;
  --accent-orange: #f59e0b;

  /* Borders & Effects */
  --border: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(0, 212, 255, 0.3);
  --shadow: rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.1);

  /* Gradients */
  --gradient-1: linear-gradient(135deg, #00d4ff 0%, #8b5cf6 100%);
  --gradient-2: linear-gradient(135deg, #22c55e 0%, #00d4ff 100%);

  /* Spacing Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: "Outfit", sans-serif;
  background: radial-gradient(circle at top, rgba(0, 212, 255, 0.06), transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.05), transparent 45%),
    var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Site Header - Glassmorphism */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(6, 8, 13, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}

.site-header .inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
}

.site-logo {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-fast);
}

.site-logo:hover {
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.site-logo::before {
  content: ">";
  opacity: 0.5;
  animation: blink 1s infinite;
}

.site-nav {
  display: flex;
  gap: var(--space-5);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.site-nav a:hover {
  color: var(--ink);
}

.site-nav a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.site-nav a:hover::after {
  transform: scaleX(1);
}

@keyframes blink {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* Hero Section */
.hero {
  padding: var(--space-16) 0 var(--space-10);
  text-align: left;
}

.hero .kicker {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.08;
  margin: var(--space-4) 0 var(--space-3);
  text-wrap: balance;
  letter-spacing: -0.02em;
}

.hero p {
  color: var(--muted);
  max-width: 680px;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Post Shell - Card Container */
.post-shell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: 0 30px 80px var(--shadow);
  position: relative;
}

.post-shell::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-1);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  opacity: 0.5;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.post-cover {
  margin: var(--space-6) 0 var(--space-8);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.post-cover img {
  display: block;
  width: 100%;
  height: auto;
}

/* Post Content Typography */
.post-content h2,
.post-content h3,
.post-content h4 {
  font-family: "Space Grotesk", sans-serif;
  margin-top: 2.4em;
  margin-bottom: 0.8em;
  letter-spacing: -0.01em;
}

.post-content h2 {
  font-size: 1.6rem;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.post-content h3 {
  font-size: 1.3rem;
}

.post-content h4 {
  font-size: 1.1rem;
}

.post-content p,
.post-content li {
  color: #d3d7e2;
  line-height: 1.8;
}

.post-content img {
  max-width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin: var(--space-6) 0;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  margin: var(--space-6) 0;
  padding-left: var(--space-5);
  color: var(--muted);
  font-style: italic;
}

.post-content pre {
  background: #080c14;
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  overflow-x: auto;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  line-height: 1.7;
  margin: var(--space-6) 0;
}

.post-content code {
  font-family: "JetBrains Mono", monospace;
  background: rgba(0, 212, 255, 0.08);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.88em;
}

.post-content pre code {
  background: transparent;
  padding: 0;
}

.post-content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.post-content a:hover {
  border-color: var(--accent);
}

/* Series Navigation */
.series-nav {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-10);
}

.series-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface-2);
  text-decoration: none;
  transition: all var(--transition-base);
}

.series-card span {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.series-card strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
}

.series-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-elevated);
  transform: translateX(4px);
}

/* Blog Listing - Card Grid with Images */
.listing {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.listing-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.listing-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), var(--shadow-glow);
}

.listing-item-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--surface-2);
}

.listing-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.listing-item:hover .listing-item-image img {
  transform: scale(1.05);
}

.listing-item-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(6, 8, 13, 0.7) 0%, transparent 50%);
  pointer-events: none;
}

.listing-item-badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  color: var(--bg);
  background: var(--gradient-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  z-index: 2;
}

.listing-item-content {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.listing-item-content h2 {
  margin: 0 0 var(--space-3);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
}

.listing-item-content p {
  margin: 0 0 var(--space-4);
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
  flex-grow: 1;
}

.listing-item-link {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-fast);
  margin-top: auto;
}

.listing-item-link:hover {
  color: var(--ink);
  gap: var(--space-3);
}

.listing-item-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.listing-item:hover .listing-item-link svg {
  transform: translateX(4px);
}

/* Series card (for blog index) */
.series-listing-item {
  grid-column: 1 / -1;
  max-width: 600px;
  margin: 0 auto;
}

@media (max-width: 720px) {
  .listing {
    grid-template-columns: 1fr;
  }
}

/* Footer */
.footer {
  margin: var(--space-16) 0 var(--space-10);
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  text-align: center;
}

/* Responsive */
@media (max-width: 720px) {
  .post-shell {
    padding: var(--space-7);
    border-radius: var(--radius-lg);
  }

  .site-header .inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .site-nav {
    flex-wrap: wrap;
  }

  .hero {
    padding: var(--space-12) 0 var(--space-8);
  }

  .hero h1 {
    font-size: clamp(1.8rem, 6vw, 2.4rem);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Selection */
::selection {
  background: rgba(0, 212, 255, 0.25);
  color: var(--ink);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}