body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background-color: #0a192f;
  color: #e0f0ff;
  line-height: 1.6;
}
header {
  background-color: #091d36;
  padding: 20px;
  text-align: center;
}
header h1 {
  margin: 0;
  color: #00c3ff;
}
.subtitle {
  color: #9fc7ff;
}
main {
  max-width: 960px;
  margin: auto;
  padding: 30px 20px;
}
h2 {
  color: #00b7ff;
}
section {
  margin-top: 40px;
  border-top: 1px solid #1c3c5e;
  padding-top: 20px;
}
.download-box {
  background: #091d36;
  padding: 20px;
  border-radius: 8px;
  border: 2px solid #00b7ff;
  text-align: center;
  box-shadow: inset 0 0 10px #00b7ff40;
}
footer {
  background-color: #091d36;
  text-align: center;
  padding: 10px;
  color: #ccc;
}
a {
  color: #00b7ff;
  text-decoration: none;
}
img {
  max-width: 100%;
  margin-top: 10px;
  border-radius: 10px;
  box-shadow: 0 0 10px #00b7ff80;
}
ul {
  padding-left: 20px;
}