/* ============================================
   Responsive Blog Theme - Global Styles
   ============================================ */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f8f9fa;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1em;
}

a {
  color: #007bff;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #0056b3;
  text-decoration: underline;
}

code {
  background-color: #f4f4f4;
  padding: 2px 6px;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

pre {
  background-color: #2d2d2d;
  color: #f8f8f2;
  padding: 1em;
  border-radius: 5px;
  overflow-x: auto;
  margin-bottom: 1em;
  line-height: 1.5;
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
}

blockquote {
  border-left: 4px solid #007bff;
  margin-left: 0;
  padding-left: 1em;
  color: #666;
  margin-bottom: 1em;
}

/* ============================================
   Header / Navigation
   ============================================ */

header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 2rem 1rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.1rem;
  opacity: 0.95;
  margin-bottom: 0;
}

nav {
  background-color: #fff;
  border-bottom: 1px solid #e0e0e0;
  padding: 1rem 0;
  text-align: center;
  margin-bottom: 2rem;
}

nav a {
  margin: 0 1rem;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav a:hover {
  color: #667eea;
}

/* ============================================
   Main Container & Layout
   ============================================ */

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem;
}

main {
  background-color: white;
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  margin-bottom: 2rem;
}

/* ============================================
   Article / Blog Post Styles
   ============================================ */

.article {
  max-width: 800px;
  margin: 0 auto;
}

.article-header {
  border-bottom: 2px solid #f0f0f0;
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
}

.article-title {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #222;
}

.article-meta {
  color: #888;
  font-size: 0.95rem;
}

.article-meta .date {
  margin-right: 1rem;
}

.article-meta .category {
  background-color: #667eea;
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  display: inline-block;
  margin-right: 0.5rem;
}

.article-meta .tags {
  margin-top: 0.5rem;
}

.article-tag {
  background-color: #f0f0f0;
  color: #333;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  display: inline-block;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.article-tag:hover {
  background-color: #667eea;
  color: white;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  text-align: justify;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5em 0;
}

/* ============================================
   Ad Placement Zones (Responsive)
   ============================================ */

/* Ad Zone 1: Top of article (before content) */
.ad-zone-top {
  text-align: center;
  margin-bottom: 2rem;
  padding: 1rem;
  background-color: #f8f9fa;
  border-radius: 8px;
}

/* Ad Zone 2: Sidebar (desktop) / Below article (mobile) */
.ad-zone-sidebar {
  text-align: center;
  padding: 1rem;
  background-color: #f8f9fa;
  border-radius: 8px;
}

/* Ad Zone 3: Between article sections */
.ad-zone-middle {
  text-align: center;
  margin: 2rem 0;
  padding: 1rem;
  background-color: #f8f9fa;
  border-radius: 8px;
}

/* Ad Zone 4: Bottom of article (after content) */
.ad-zone-bottom {
  text-align: center;
  margin-top: 2rem;
  padding: 1rem;
  background-color: #f8f9fa;
  border-radius: 8px;
}

.ad-placeholder {
  background-color: #e0e0e0;
  color: #999;
  padding: 2rem 1rem;
  text-align: center;
  border-radius: 4px;
  font-size: 0.9rem;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============================================
   Articles List / Homepage
   ============================================ */

.articles-list {
  max-width: 800px;
  margin: 0 auto;
}

.article-card {
  background-color: white;
  border-left: 4px solid #667eea;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: box-shadow 0.3s ease;
}

.article-card:hover {
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.article-card h2 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.article-card a {
  color: #333;
}

.article-card a:hover {
  color: #667eea;
}

.article-card .summary {
  color: #666;
  margin-bottom: 0.5rem;
}

.article-card .meta {
  font-size: 0.9rem;
  color: #999;
}

/* ============================================
   Footer
   ============================================ */

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 3rem;
  border-top: 3px solid #667eea;
}

footer p {
  margin-bottom: 0.5rem;
}

footer a {
  color: #667eea;
}

/* ============================================
   Responsive Design - Mobile Optimizations
   ============================================ */

@media (max-width: 768px) {
  /* Typography adjustments */
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .article-title {
    font-size: 1.75rem;
  }

  /* Main content */
  main {
    padding: 1rem;
  }

  header {
    padding: 1rem;
  }

  header h1 {
    font-size: 1.75rem;
  }

  /* Navigation */
  nav a {
    display: block;
    margin: 0.5rem 0;
  }

  /* Article content centering */
  .article-content {
    text-align: center;
    font-size: 1rem;
  }

  .article-meta {
    font-size: 0.85rem;
  }

  /* Ad zones for mobile */
  .ad-zone-top,
  .ad-zone-sidebar,
  .ad-zone-middle,
  .ad-zone-bottom {
    margin-left: -1rem;
    margin-right: -1rem;
    padding: 1rem;
    width: calc(100% + 2rem);
  }

  /* Mobile-friendly ad size */
  .ad-placeholder {
    min-height: 250px; /* Mobile ad standard: 300x250 or 320x50 */
  }
}

@media (max-width: 480px) {
  header {
    padding: 0.75rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  main {
    padding: 0.75rem;
  }

  .article-title {
    font-size: 1.4rem;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.1rem; }

  .article-content {
    font-size: 0.95rem;
  }
}

/* ============================================
   Desktop Layout with Sidebar
   ============================================ */

@media (min-width: 1024px) {
  body {
    display: flex;
    flex-direction: column;
  }

  .main-wrapper {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    gap: 2rem;
    padding: 2rem 1rem;
    width: 100%;
  }

  .article-wrapper {
    flex: 2;
  }

  .sidebar {
    flex: 1;
  }

  /* Desktop ad zones */
  .ad-zone-sidebar {
    position: sticky;
    top: 1rem;
    height: fit-content;
  }

  .ad-placeholder {
    min-height: 600px; /* Desktop ad standard: 300x600 or 728x90 */
  }
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center {
  text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

.hidden {
  display: none;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  header, nav, footer, .ad-zone-top, .ad-zone-sidebar, .ad-zone-middle, .ad-zone-bottom {
    display: none;
  }

  main {
    box-shadow: none;
  }
}