body {
  background-color: #f1f1f1;
}
header {
  background-color: #000;
  padding: 15px 0;
  text-align: center;
}
header img {
  height: 40px;
}
.app-card {
  background: #fff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  text-align: center;
}
.app-card:hover {
  transform: translateY(-5px);
}
.app-icon {
  font-size: 40px;
  margin-bottom: 15px;
  color: #d30000;
}
.appstore-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 15px;
  background-color: #000;
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
  transition: background 0.3s ease;
}
.appstore-button:hover {
  background-color: #222;
}
.appstore-button i {
  font-size: 18px;
  margin-right: 8px;
}