* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  background: #f6f7f8;
  color: #222;
  line-height: 1.6;
}

header {
  background: #0f172a;
  color: #fff;
  padding: 2.5rem 1rem;
  text-align: center;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.tagline {
  opacity: 0.9;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: #fff;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.card h2 {
  margin-bottom: 0.75rem;
  font-size: 1.2rem;
}

.card a {
  color: #2563eb;
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

iframe {
  width: 100%;
  height: 300px;
  border: none;
  margin-top: 0.75rem;
  border-radius: 8px;
}

footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.9rem;
  color: #666;
}