:root {
  --primary: #1e40af;
  --secondary: #2563eb;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e5e7eb;
  --success: #dcfce7;
  --warning: #fff7ed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}

.blog-wrapper {
  max-width: 1200px;
  margin: 40px auto;
  background: var(--card);
  padding: 120px 40px 40px;
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.05);
}

.blog-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 20px;
  margin-bottom: 30px;
}

.badge {
  display: inline-block;
  background: var(--secondary);
  color: #fff;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
}

h1 {
  font-size: 2.3rem;
  margin: 12px 0;
}

.subtitle {
  color: var(--muted);
}

.meta {
  font-size: 0.85rem;
  color: var(--muted);
}

.toc {
  background: #f1f5f9;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 40px;
}

.toc ul {
  padding-left: 18px;
}

.toc a {
  color: var(--primary);
  text-decoration: none;
}

h2 {
  margin-top: 40px;
  font-size: 1.5rem;
  color: var(--primary);
}

h3 {
  margin-top: 20px;
  font-size: 1.1rem;
}

ul {
  padding-left: 20px;
}

.note {
  background: var(--success);
  padding: 15px;
  border-radius: 10px;
}

.warning {
  background: var(--warning);
  padding: 15px;
  border-left: 5px solid #fb923c;
  border-radius: 10px;
}

.checklist {
  background: #eff6ff;
  padding: 25px;
  border-radius: 14px;
}

.blog-footer {
  margin-top: 40px;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 20px;
}