body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  padding: 20px;
  background: #fff;
  color: #333;
  max-width: 900px;
  margin: 0 auto;
}
h1, h2, h3 {
  color: #1a5276;
}
a {
  color: #2980b9;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.card, .tool {
  background: #f9f9f9;
  padding: 15px;
  margin: 15px 0;
  border-radius: 8px;
}
.features {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.card {
  flex: 1 1 300px;
}
footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #eee;
  text-align: center;
}
.social a {
  margin: 0 8px;
}
nav {
  margin-top: 20px;
  text-align: center;
}