:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-secondary: #7c3aed;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #e5e7eb;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;

  /* Transitions */
  --transition: all 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #f9fafb;
    --color-text-light: #d1d5db;
    --color-bg: #111827;
    --color-bg-alt: #1f2937;
    --color-border: #374151;
  }
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: var(--transition);
}

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

.site-nav {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.site-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
  background-color: var(--color-bg-alt);
}

/* Main content */
.site-main {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-2xl) 0;
}

/* Footer */
.site-footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--color-primary);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Hero section */
.hero {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-secondary {
  background-color: var(--color-bg-alt);
  color: var(--color-text);
}

.btn-secondary:hover {
  background-color: var(--color-border);
  transform: translateY(-2px);
}

/* Card */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-xl);
  transition: var(--transition);
}

.card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

/* Blog posts */
.blog-post {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid var(--color-border);
}

.blog-post:last-child {
  border-bottom: none;
}

.blog-post-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.blog-post-title a {
  color: var(--color-text);
  text-decoration: none;
  transition: var(--transition);
}

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

.blog-post-meta {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.blog-post-excerpt {
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.blog-post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  text-decoration: none;
  transition: var(--transition);
}

.tag:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Single post */
.post {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.post-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.post-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.post-meta {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-text);
}

.post-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
}

.post-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-content p {
  margin-bottom: var(--spacing-lg);
}

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

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

.post-content ul,
.post-content ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
}

.post-content li {
  margin-bottom: var(--spacing-sm);
}

.post-content code {
  background-color: var(--color-bg-alt);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.post-content pre {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.post-content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

.post-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-light);
  font-style: italic;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: var(--spacing-lg) 0;
}

/* Post navigation */
.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.post-nav-prev,
.post-nav-next {
  flex: 1;
}

.post-nav-prev {
  text-align: left;
}

.post-nav-next {
  text-align: right;
}

.post-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .site-nav {
    gap: var(--spacing-md);
  }

  .post-title {
    font-size: 1.75rem;
  }

  .post-content {
    font-size: 1rem;
  }
}