* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  background-color: #f9f9f9;
  color: #222;
  line-height: 1.6;
  padding: 20px;
}

header {
  background: linear-gradient(45deg, #ff0000, #0000ff);
  color: #fff;
  padding: 40px 20px;
  text-align: center;
  border-radius: 12px;
  margin-bottom: 20px;
}

header h1 {
  font-size: 2em;
}

.ad-btn {
  display: inline-block;
  margin: 10px;
  padding: 12px 20px;
  background-color: #fff;
  color: #000;
  font-weight: bold;
  border-radius: 8px;
  text-decoration: none;
  transition: 0.3s ease;
}

.ad-btn:hover {
  background-color: #222;
  color: #fff;
}

main section {
  margin-bottom: 30px;
  padding: 15px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

h2 {
  color: #0056b3;
  margin-bottom: 10px;
}

.download-btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: #28a745;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  margin-top: 10px;
}

.download-btn:hover {
  background-color: #218838;
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
  color: #666;
}