* {
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', sans-serif;
  background: #ffffff;
  color: #333;
  margin: 0;
  padding: 0;
}
header {
  background-color: #f7f9fc;
  padding: 20px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #ddd;
}
header img {
  height: 50px;
}
nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #0056cc;
  font-weight: 600;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 40px 20px;
  max-width: 1000px;
  margin: auto;
}
h1, h2 {
  color: #004999;
}
footer {
  background-color: #f1f1f1;
  padding: 20px;
  text-align: center;
  font-size: 0.9em;
  color: #666;
  border-top: 1px solid #ccc;
}
.button {
  background: #0056cc;
  color: white;
  padding: 12px 20px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
  margin-top: 20px;
}
img.responsive {
  max-width: 100%;
  height: auto;
}