body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f9fbfd;
  color: #1e1e1e;
  margin: 0;
  padding: 0;
}
.site-header {
  background-color: #d6f2f2;
  padding: 1.5rem;
  text-align: center;
  border-bottom: 1px solid #bbb;
}
.site-header h1 {
  margin: 0;
  font-size: 2rem;
  color: #136c72;
}
.site-nav {
  margin-top: 0.5rem;
}
.site-nav a {
  color: #238c91;
  margin: 0 10px;
  font-weight: bold;
  text-decoration: none;
}
.site-subtitle {
  text-align: center;
  background-color: #eef8f9;
  color: #3a3a3a;
  padding: 1.2rem;
  font-size: 1.1rem;
}
.content {
  max-width: 900px;
  margin: auto;
  padding: 2rem;
  line-height: 1.75;
}
.download-btn, .cta-card-btn {
  display: inline-block;
  background-color: #33b6bb;
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-weight: bold;
  text-decoration: none;
  margin-top: 1rem;
}
.download-btn:hover, .cta-card-btn:hover {
  background-color: #289fa3;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.card {
  background: #ffffff;
  padding: 1.5rem;
  border: 1px solid #ddd;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.03);
}
.card h3 {
  margin-top: 0;
  color: #14696e;
}
.card blockquote {
  font-style: italic;
  color: #666;
  font-size: 0.9rem;
}
.site-footer {
  text-align: center;
  background-color: #eaf8f9;
  color: #333;
  padding: 2rem;
  font-size: 0.95rem;
}