body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f9fbfc;
  color: #2c3e50;
  margin: 0;
  padding: 0;
}
.site-header {
  background-color: #1b263b;
  color: white;
  padding: 2rem;
  text-align: center;
}
.site-header h1 {
  margin: 0;
  font-size: 2.4rem;
}
.site-nav a {
  color: #61dafb;
  text-decoration: none;
  margin: 0 1rem;
  font-weight: bold;
}

.site-subtitle {
  background-color: #dce9f3;
  padding: 1rem;
  text-align: center;
  font-size: 1.1rem;
  color: #3b4c5a;
}

.content {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  line-height: 1.7;
}

.download-btn, .cta-card-btn {
  display: inline-block;
  background-color: #0a9396;
  color: white;
  padding: 0.75rem 1.2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  margin-top: 1rem;
}
.download-btn:hover, .cta-card-btn:hover {
  background-color: #00787d;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.card {
  background: white;
  padding: 1.5rem;
  border: 1px solid #dce2e6;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.card h3 {
  margin-top: 0;
  color: #0a9396;
}
.card blockquote {
  font-style: italic;
  color: #566b78;
}

.site-footer {
  text-align: center;
  background-color: #1b263b;
  padding: 2rem;
  color: white;
  font-size: 0.95rem;
}