/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #fafafa;
  --color-text: #333;
  --color-heading: #1a1a1a;
  --color-link: #2563eb;
  --color-link-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --color-muted: #6b7280;
  --color-accent: #059669;
  --color-accent-hover: #047857;
  --color-card-bg: #fff;
  --max-width: 1200px;
  --content-width: 800px;
  --sidebar-width: 320px;
  --gap: 2rem;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

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

/* Site Header */
.site-header {
  background: var(--color-card-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-heading);
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.site-nav a {
  margin-left: 1.5rem;
  color: var(--color-muted);
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--color-link);
  text-decoration: none;
}

/* Layout: Two-Column Grid */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--gap);
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--gap);
}

/* Main Content */
.content {
  min-width: 0;
}

/* Hero */
.hero {
  text-align: center;
  padding: 2rem 0 1rem;
}

.hero h1 {
  font-size: 2.5rem;
  color: var(--color-heading);
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.2rem;
  color: var(--color-muted);
}

/* Post List */
.post-list {
  margin-top: 1.5rem;
}

.post-summary {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.post-summary h2,
.post-summary h3 {
  margin-bottom: 0.5rem;
}

.post-summary h2 a,
.post-summary h3 a {
  color: var(--color-heading);
}

.post-summary h2 a:hover,
.post-summary h3 a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.post-meta {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.post-categories a {
  color: var(--color-accent);
  margin-left: 0.5rem;
}

.read-more {
  font-weight: 600;
  color: var(--color-accent);
}

.read-more:hover {
  color: var(--color-accent-hover);
}

/* Single Post */
.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  font-size: 2rem;
  color: var(--color-heading);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.post-content {
  font-size: 1.05rem;
}

.post-content h2 {
  font-size: 1.5rem;
  color: var(--color-heading);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

.post-content h3 {
  font-size: 1.25rem;
  color: var(--color-heading);
  margin: 1.5rem 0 0.75rem;
}

.post-content p {
  margin-bottom: 1.25rem;
}

.post-content ul,
.post-content ol {
  margin: 1rem 0 1.25rem 1.5rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--color-card-bg);
  border-radius: 0 8px 8px 0;
}

.post-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.post-tags .tag {
  display: inline-block;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.25rem 0.75rem;
  margin: 0.25rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.post-tags .tag:hover {
  background: var(--color-link);
  color: white;
  text-decoration: none;
  border-color: var(--color-link);
}

/* Sidebar */
.sidebar {
  font-size: 0.925rem;
}

.sidebar-section {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.sidebar-section h3 {
  font-size: 1rem;
  color: var(--color-heading);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
}

.sidebar-section ul {
  list-style: none;
}

.sidebar-section li {
  margin-bottom: 0.4rem;
}

.sidebar-section li a {
  color: var(--color-text);
}

.tag-cloud .tag {
  display: inline-block;
  margin: 0.2rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* Ad Units */
.ad-unit {
  margin: 1.5rem 0;
  text-align: center;
  min-height: 50px;
}

.ad-in-content {
  margin: 2rem 0;
  padding: 1rem 0;
}

/* Affiliate Box */
.affiliate-box {
  border: 2px solid var(--color-accent);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  background: #f0fdf4;
}

.affiliate-box h4 {
  color: var(--color-heading);
  margin-bottom: 0.5rem;
}

.affiliate-box p {
  margin-bottom: 1rem;
  color: var(--color-muted);
}

.affiliate-btn {
  display: inline-block;
  background: var(--color-accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
}

.affiliate-btn:hover {
  background: var(--color-accent-hover);
  color: white;
  text-decoration: none;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
  list-style: none;
}

.page-item a,
.page-item span {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.page-item.active span {
  background: var(--color-link);
  color: white;
  border-color: var(--color-link);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }

  .header-inner {
    flex-direction: column;
    gap: 0.75rem;
  }

  .site-nav a {
    margin-left: 0;
    margin-right: 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .post-header h1 {
    font-size: 1.5rem;
  }
}