:root {
  --bg: #0a0f1a;
  --bg2: #111827;
  --primary: #3b82f6;
  --accent: #60a5fa;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #1e293b;
}

*, ::after, ::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: Inter, system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent);
}

ol, ul {
  list-style: none;
}

[data-theme=light] {
  --bg: #f8fafc;
  --bg2: #ffffff;
  --primary: #2563eb;
  --accent: #3b82f6;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
}

[data-theme=dark] .icon-sun {
  display: none;
}

[data-theme=light] .icon-moon {
  display: none;
}

[data-theme=light] .newsletter-box,
[data-theme=light] .post-card {
  background: var(--bg2);
  border-color: var(--border);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 800px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

[data-theme=light] .site-header {
  background: rgba(248, 250, 252, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  cursor: pointer;
}

.logo:hover {
  color: var(--primary);
}

.logo-icon {
  font-size: 1.5rem;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.nav-links li a {
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s;
  cursor: pointer;
}

.nav-links li a:hover {
  color: var(--text);
  background: var(--border);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.hero {
  padding: 2rem 0;
}

.hero-post {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2.5rem;
  align-items: center;
  background: var(--bg2);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.hero-image-link {
  overflow: hidden;
  aspect-ratio: 16/9;
  cursor: pointer;
}

.hero-image-link img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.hero-post:hover .hero-image-link img {
  transform: scale(1.03);
}

.hero-content {
  padding: 2rem 2rem 2rem 0;
}

.hero-content h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 0.75rem 0;
}

.hero-content h1 a {
  color: var(--text);
  cursor: pointer;
}

.hero-content h1 a:hover {
  color: var(--primary);
}

.hero-content p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.hero-meta {
  display: flex;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.posts-section {
  padding: 3rem 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.post-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

[data-theme=light] .post-card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.post-card-image-link {
  display: block;
  overflow: hidden;
  aspect-ratio: 16/9;
  cursor: pointer;
  background: var(--border);
}

.post-card-image-link img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.post-card:hover .post-card-image-link img {
  transform: scale(1.05);
}

.post-card-body {
  padding: 1.25rem;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.category-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: color-mix(in srgb, var(--cat-color, var(--primary)) 15%, transparent);
  color: var(--cat-color, var(--primary));
  border: 1px solid color-mix(in srgb, var(--cat-color, var(--primary)) 30%, transparent);
  cursor: pointer;
  text-decoration: none;
}

.read-time::before {
  content: "\00b7";
  margin-right: 0.75rem;
}

.post-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.post-card-title a {
  color: var(--text);
  cursor: pointer;
}

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

.post-card-excerpt {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.newsletter-section {
  padding: 3rem 0 4rem;
}

.newsletter-box {
  text-align: center;
  padding: 3rem 2rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.newsletter-box h2 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.newsletter-box p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.newsletter-form {
  display: flex;
  gap: 0.75rem;
  max-width: 440px;
  margin: 0 auto;
}

.newsletter-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

.newsletter-form input:focus {
  outline: 0;
  border-color: var(--primary);
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg2);
  color: var(--text);
  border: 1px solid var(--border);
}

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

.post-article {
  padding: 2rem 0 3rem;
}

.breadcrumbs {
  margin-bottom: 2rem;
}

.breadcrumbs ol {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.breadcrumbs li::after {
  content: "\203A";
  margin-left: 0.5rem;
}

.breadcrumbs li:last-child::after {
  content: "";
}

.breadcrumbs li:last-child {
  color: var(--text);
  font-weight: 500;
}

.breadcrumbs a {
  color: var(--text-muted);
  cursor: pointer;
}

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

.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 0.75rem 0 1rem;
}

.post-meta {
  display: flex;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.post-hero-image {
  margin-bottom: 2.5rem;
  border-radius: 12px;
  overflow: hidden;
  background: var(--border);
}

.post-hero-image img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.prose {
  font-size: 1.1rem;
  line-height: 1.8;
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--text);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--text);
}

.prose ol, .prose ul {
  margin: 1rem 0 1.5rem 1.5rem;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose strong {
  font-weight: 600;
  color: var(--text);
}

.prose blockquote {
  border-left: 3px solid var(--primary);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: color-mix(in srgb, var(--primary) 5%, transparent);
  border-radius: 0 8px 8px 0;
  font-style: italic;
}

.prose code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9em;
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.prose pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.prose pre code {
  background: transparent;
  padding: 0;
  font-size: 0.85rem;
}

.prose a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose a:hover {
  color: var(--accent);
}

.prose img {
  border-radius: 8px;
  margin: 1.5rem 0;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.tag {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.25rem 0.6rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
}

.post-sources {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.post-sources h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

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

.post-sources li {
  margin-bottom: 0.25rem;
}

.post-sources a {
  font-size: 0.85rem;
  word-break: break-all;
}

.related-section {
  padding: 2rem 0 4rem;
  border-top: 1px solid var(--border);
}

.category-hero {
  padding: 3rem 0;
  background: color-mix(in srgb, var(--cat-color, var(--primary)) 8%, var(--bg));
  border-bottom: 1px solid var(--border);
}

.category-hero h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.category-hero p {
  color: var(--text-muted);
}

.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.category-pill {
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg2);
  color: var(--text-muted);
  transition: all 0.2s;
  text-decoration: none;
}

.category-pill:hover, .category-pill.active {
  color: #fff;
  border-color: transparent;
}

.about-page {
  padding: 3rem 0 4rem;
}

.about-page h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 2rem;
}

.about-page .prose {
  max-width: 800px;
}

.site-footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-brand .logo-icon {
  font-size: 1.5rem;
}

.footer-brand span:nth-child(2) {
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 3rem;
  justify-content: flex-end;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.footer-col ul li {
  margin-bottom: 0.35rem;
}

.footer-col a {
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
}

.footer-col a:hover {
  color: var(--primary);
}

.footer-bottom {
  grid-column: 1 / -1;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.load-more-wrap {
  text-align: center;
  margin-top: 2.5rem;
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg2) 25%,
    var(--border) 50%,
    var(--bg2) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

.skeleton-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.skeleton-img {
  aspect-ratio: 16/9;
  background: var(--border);
}

.skeleton-line {
  height: 1rem;
  margin: 0.5rem 1.25rem;
  border-radius: 4px;
}

.skeleton-line.w60 { width: 60%; }
.skeleton-line.w80 { width: 80%; }
.skeleton-line.w40 { width: 40%; }

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

.page-transition {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.error-state, .empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.error-state h2, .empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.error-state p, .empty-state p {
  margin-bottom: 1.5rem;
}

/* Broken image fallback */
img.broken {
  position: relative;
  min-height: 120px;
}
img.broken::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--border);
}

@media (max-width: 768px) {
  .hero-post {
    grid-template-columns: 1fr;
  }

  .hero-content {
    padding: 1.5rem;
  }

  .hero-content h1 {
    font-size: 1.5rem;
  }

  .post-grid {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: 0;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li a {
    padding: 0.75rem 1rem;
    display: block;
    width: 100%;
    border-radius: 0;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
  }

  .post-header h1 {
    font-size: 1.75rem;
  }

  .header-inner {
    padding: 0 1rem;
  }

  .category-pills {
    gap: 0.35rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .post-card-body {
    padding: 1rem;
  }

  .hero-content {
    padding: 1rem;
  }
}