:root {
  --text: #1a1a1a;
  --text-secondary: #555;
  --bg: #fff;
  --bg-alt: #f7f7f7;
  --accent: #2c5f8a;
  --accent-hover: #1d4060;
  --border: #ddd;
  --max-width: 960px;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  border-bottom: 2px solid var(--accent);
  padding: 1.5rem 0;
  margin-bottom: 2rem;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.site-title a {
  color: var(--text);
  text-decoration: none;
}

.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}

.site-nav a:hover {
  color: var(--accent);
}

/* Footer */
.site-footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Landing page */
.hero {
  text-align: center;
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.hero h2 {
  font-size: 2rem;
  font-weight: 300;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* Sections */
.section {
  margin-bottom: 3rem;
}

.section h2 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  background: var(--bg-alt);
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.card h3 a {
  color: var(--accent);
  text-decoration: none;
}

.card h3 a:hover {
  text-decoration: underline;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.card .badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  background: var(--accent);
  color: #fff;
  margin-right: 0.3rem;
}

.card .badge.secondary {
  background: var(--text-secondary);
}

/* Posts / Blog */
.post-list {
  list-style: none;
}

.post-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list time {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.post-list a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  margin-bottom: 0.5rem;
}

.post-header time,
.post-author {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.post-content h2 { margin: 2rem 0 1rem; }
.post-content p { margin-bottom: 1rem; }
.post-content ul, .post-content ol { margin: 1rem 0 1rem 1.5rem; }

/* Brief */
.brief-number {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.brief-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-style: italic;
}

.brief-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* Community links */
.community-links {
  list-style: none;
}

.community-links li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.community-links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.community-links .desc {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

/* Responsive */
@media (max-width: 600px) {
  .site-header .container { flex-direction: column; }
  .site-nav a { margin-left: 0; margin-right: 1rem; }
  .hero h2 { font-size: 1.5rem; }
}