* {
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", Roboto, sans-serif;
  margin: 0;
  background: #f4f7fb;
  color: #253238;
}
header {
  background: linear-gradient(120deg, #005A9C, #808080, #ff4f00);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px;
}
section {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}
section h2 {
  margin-top: 0;
  color: #800000;
}
footer {
  padding: 24px;
  text-align: center;
  background: #e8edf4;
  font-size: 0.9rem;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  background-color: #333333aa;
  display: flex;
}

nav ul li a {
  display: block;
  color: white;
  padding: 14px 16px;
  text-decoration: none;
}

nav ul li a:hover {
  background-color: #111111;
}