:root {
  --text: #1a1a2e;
  --text-light: #636e72;
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --accent: #2d6cdf;
  --accent-hover: #1a4fa0;
  --border: #e2e8f0;
  --max-w: 720px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-header .logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.site-header nav a {
  margin-left: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-light);
}

/* Main content */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Homepage */
.hero {
  padding: 3rem 0 2rem;
  text-align: center;
}
.hero h1 {
  font-size: 2rem;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}
.hero p {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 540px;
  margin: 0 auto;
}

.article-list {
  list-style: none;
  margin-top: 2rem;
}
.article-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.article-list li:last-child { border-bottom: none; }
.article-list h2 {
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}
.article-list h2 a { color: var(--text); }
.article-list h2 a:hover { color: var(--accent); text-decoration: none; }
.article-list .meta {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.4rem;
}
.article-list .excerpt {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* Article page */
.article-header {
  padding: 2.5rem 0 1.5rem;
}
.article-header h1 {
  font-size: 1.8rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}
.article-header .meta {
  color: var(--text-light);
  font-size: 0.9rem;
}

.article-body h2 {
  font-size: 1.3rem;
  margin: 2rem 0 0.75rem;
}
.article-body h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}
.article-body p {
  margin-bottom: 1rem;
}
.article-body ul, .article-body ol {
  margin: 0.5rem 0 1rem 1.5rem;
}
.article-body li {
  margin-bottom: 0.4rem;
}
.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  color: var(--text-light);
  background: var(--bg-alt);
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.article-body th, .article-body td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}
.article-body th {
  background: var(--bg-alt);
  font-weight: 600;
}

/* CTA box */
.cta-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  text-align: center;
}
.cta-box p { margin-bottom: 0.5rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.5rem; }
  .article-header h1 { font-size: 1.4rem; }
  .container { padding: 1.5rem 1rem 3rem; }
}