:root {
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--gray-700);
  background: var(--gray-50);
  line-height: 1.7;
}

/* Header */
header {
  background: linear-gradient(135deg, var(--gray-900), #1e3a5f);
  color: white;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header h1 { font-size: 1.1rem; font-weight: 800; }
header .tagline { font-size: 0.65rem; opacity: 0.7; margin-left: 0.5rem; }
.header-left { display: flex; align-items: baseline; }
.header-left a { color: white; text-decoration: none; }

.header-nav {
  display: flex;
  gap: 0.5rem;
}

.header-nav a {
  padding: 0.3rem 0.7rem;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 4px;
  background: rgba(255,255,255,0.1);
  color: white;
  font-size: 0.75rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s;
}

.header-nav a:hover { background: rgba(255,255,255,0.2); }

/* Breadcrumbs */
.breadcrumbs {
  padding: 0.6rem 1rem;
  font-size: 0.75rem;
  color: var(--gray-400);
  background: white;
  border-bottom: 1px solid var(--gray-200);
}

.breadcrumbs a {
  color: var(--blue-600);
  text-decoration: none;
}

.breadcrumbs a:hover { text-decoration: underline; }
.breadcrumbs span { margin: 0 0.3rem; }

/* Blog Index */
.blog-hero {
  background: linear-gradient(135deg, var(--gray-900), #1e3a5f);
  color: white;
  padding: 2.5rem 1rem 2rem;
  text-align: center;
}

.blog-hero h2 { font-size: 2rem; font-weight: 800; margin-bottom: 0.5rem; }
.blog-hero p { font-size: 1rem; opacity: 0.8; max-width: 600px; margin: 0 auto; }

.blog-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Article list on index */
.article-list {
  list-style: none;
}

.article-list li {
  border-bottom: 1px solid var(--gray-200);
}

.article-list li:last-child { border-bottom: none; }

.article-list a {
  display: block;
  padding: 1.25rem 0;
  text-decoration: none;
  transition: background 0.1s;
}

.article-list a:hover { background: var(--gray-50); padding-left: 0.5rem; margin-left: -0.5rem; border-radius: 4px; }

.article-list .article-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.25rem;
}

.article-list .article-excerpt {
  font-size: 0.82rem;
  color: var(--gray-500);
  line-height: 1.5;
}

.article-list .article-date {
  font-size: 0.7rem;
  color: var(--gray-400);
  margin-top: 0.25rem;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--gray-200);
}

.page-link, .page-current {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
}

.page-link {
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
  background: white;
  transition: background 0.15s;
}

.page-link:hover {
  background: var(--gray-100);
  border-color: var(--gray-300);
}

.page-current {
  color: white;
  background: var(--blue-600);
  border: 1px solid var(--blue-600);
}

/* Article page */
.article-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

article {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 2.5rem;
}

article h2 {
  font-size: 1.6rem;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

article .article-meta {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

article h3 {
  font-size: 1.1rem;
  color: var(--gray-800);
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

article p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

article ul, article ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

article li {
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}

article strong { color: var(--gray-800); }

.cta-box {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 1rem;
  margin-top: 1.75rem;
  text-align: center;
}

.cta-box a {
  color: var(--blue-600);
  font-weight: 600;
  text-decoration: none;
}

.cta-box a:hover { text-decoration: underline; }

/* Footer */
.blog-footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--gray-400);
  font-size: 0.8rem;
  border-top: 1px solid var(--gray-200);
}

@media (max-width: 640px) {
  article { padding: 1.25rem; }
  article h2 { font-size: 1.3rem; }
  .blog-hero h2 { font-size: 1.5rem; }
  .article-container { padding: 1rem 0.5rem; }
}