body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial;
  margin: 0;
  background: #f9fafb;
  color: #1f2937;
  line-height: 1.6;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 40px 20px;
}

h1 {
  font-size: 32px;
  margin-bottom: 20px;
}

h2 {
  margin-top: 30px;
  color: #111827;
  border-left: 4px solid #10b981;
  padding-left: 10px;
}

p {
  margin: 10px 0;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

.header {
  background: #111827;
  color: white;
  padding: 15px 20px;
}

.header a {
  color: #10b981;
  text-decoration: none;
  margin-right: 15px;
  font-size: 14px;
}

.footer {
  background: #111827;
  color: #9ca3af;
  padding: 20px;
  text-align: center;
  font-size: 13px;
  margin-top: 40px;
}

.card {
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}