:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}

.container {
  max-width: 820px;
  margin: 80px auto;
  padding: 0 20px;
}

.card {
  background: var(--card);
  padding: 48px;
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

/* Header */
.site-header {
  margin-bottom: 40px;
}

.site-title {
  font-size: 2.4rem;
  font-weight: 700;
}

.site-subtitle {
  color: var(--muted);
  margin-top: 6px;
}

/* Blog */
.post-title {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.post-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 36px;
}

h2 {
  margin-top: 48px;
  font-size: 1.6rem;
}

p {
  margin-bottom: 20px;
  font-size: 1.05rem;
}

ul {
  padding-left: 22px;
}

li {
  margin-bottom: 10px;
}

a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
}

/* Blog list */
.blog-list {
  list-style: none;
  padding: 0;
}

.blog-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.blog-item:last-child {
  border-bottom: none;
}

.blog-item a {
  font-size: 1.2rem;
}

/* Footer */
.footer {
  margin-top: 60px;
  color: var(--muted);
  font-size: 0.9rem;
}