:root {
  --color-navy: #0F2C4C;
  --color-slate: #4A5568;
  --color-ink: #1F2937;
  --color-muted: #6B7280;
  --color-bg: #FFFFFF;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --accent-teal: #00A5A8;
  --accent-orange: #F59E0B;
  --accent-blue: #3B82F6;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 12px rgba(0,0,0,0.05);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
  --maxw: 1200px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 64px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font: 16px/1.6 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.blog-header {
  background: linear-gradient(135deg, #0A0A0A 0%, #1A1A1A 30%, #2D2D2D 70%, #1A1A1A 100%);
  color: white;
  padding: var(--spacing-lg) 0;
  position: relative;
  overflow: hidden;
}

.blog-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  pointer-events: none;
}

.blog-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.logo-link {
  color: white;
  text-decoration: none;
  font-weight: 700;
  font-size: 20px;
}

.back-link {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.back-link:hover {
  color: white;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  margin: 0 0 var(--spacing-sm);
  line-height: 1.2;
  position: relative;
}

.hero-content h1::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-teal) 0%, var(--accent-orange) 100%);
  border-radius: 2px;
}

.hero-subtitle {
  font-size: 20px;
  color: rgba(255,255,255,0.9);
  margin: 0;
  font-weight: 400;
  position: relative;
}

.hero-subtitle::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--accent-teal);
  border-radius: 1px;
  opacity: 0.7;
}

/* Blog Grid */
.blog-main {
  padding: var(--spacing-xl) 0;
}

.blog-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
}

.blog-card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid #f1f5f9;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.blog-card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-50) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-size: 14px;
  position: relative;
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card-content {
  padding: var(--spacing-lg);
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 14px;
  color: var(--color-muted);
}

.blog-card-title {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 var(--spacing-sm);
  line-height: 1.3;
  color: var(--color-navy);
}

.blog-card-title a {
  color: inherit;
  text-decoration: none;
}

.blog-card-title a:hover {
  color: var(--accent-teal);
}

.blog-card-excerpt {
  color: var(--color-slate);
  margin: 0 0 var(--spacing-md);
  line-height: 1.6;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  background: var(--color-gray-100);
  color: var(--color-slate);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
}

.tag:hover {
  background: var(--accent-teal);
  color: white;
}

/* Article Page */
.article-main {
  padding: var(--spacing-xl) 0;
}

.article-content {
  max-width: 900px;
  margin: 0 auto;
}

.article-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-gray-100);
}

.article-hero-image {
  margin-bottom: var(--spacing-lg);
}

.article-cover-image {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  margin: 0 auto;
  display: block;
}

.article-image {
  margin: var(--spacing-lg) 0;
  text-align: center;
}

.inline-image {
  width: 100%;
  max-width: 500px;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin: 0 auto;
  display: block;
}

.article-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: 14px;
  color: var(--color-muted);
}

.article-title {
  font-size: clamp(32px, 5vw, 42px);
  font-weight: 700;
  margin: 0 0 var(--spacing-md);
  line-height: 1.2;
  color: var(--color-navy);
}

.article-excerpt {
  font-size: 20px;
  color: var(--color-slate);
  margin: 0 0 var(--spacing-md);
  line-height: 1.5;
}

.article-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.article-body {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-ink);
}

.article-body h2 {
  font-size: 28px;
  font-weight: 700;
  margin: var(--spacing-xl) 0 var(--spacing-md);
  color: var(--color-navy);
  line-height: 1.3;
}

.article-body h3 {
  font-size: 22px;
  font-weight: 600;
  margin: var(--spacing-lg) 0 var(--spacing-sm);
  color: var(--color-navy);
  line-height: 1.3;
}

.article-body p {
  margin: 0 0 var(--spacing-md);
}

.article-body ul, .article-body ol {
  margin: 0 0 var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.article-body li {
  margin-bottom: var(--spacing-xs);
}

.article-body blockquote {
  border-left: 4px solid var(--accent-teal);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--color-slate);
  background: var(--color-gray-50);
  padding: var(--spacing-md);
  border-radius: var(--radius);
}

.article-body code {
  background: var(--color-gray-100);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 14px;
}

.article-body pre {
  background: var(--color-gray-100);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

.article-body pre code {
  background: none;
  padding: 0;
}

.article-footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-100);
}

.author-bio {
  background: var(--color-gray-50);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
}

.author-info h3 {
  margin: 0 0 var(--spacing-sm);
  color: var(--color-navy);
  font-size: 20px;
}

.author-info p {
  margin: 0 0 var(--spacing-md);
  color: var(--color-slate);
  line-height: 1.6;
}

.author-link {
  color: var(--accent-teal);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.author-link:hover {
  color: var(--color-navy);
}

/* Footer */
.blog-footer {
  background: var(--color-gray-50);
  padding: var(--spacing-lg) 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .blog-nav {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .blog-card-content {
    padding: var(--spacing-md);
  }
  
  .article-body {
    font-size: 16px;
  }
  
  .article-body h2 {
    font-size: 24px;
  }
  
  .article-body h3 {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .blog-card-image {
    height: 160px;
  }
  
  .blog-card-title {
    font-size: 20px;
  }
  
  .article-title {
    font-size: 28px;
  }
  
  .article-excerpt {
    font-size: 18px;
  }
}