* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
  color: #222;
}

.top {
  padding: 80px 20px;
  text-align: center;
  background: linear-gradient(135deg, #1e3c72, #2a5298);
  color: white;
}

.top h1 {
  font-size: 42px;
  margin-bottom: 15px;
}

.top p {
  font-size: 18px;
  margin-bottom: 30px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  background: #ffffff;
  color: #1e3c72;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}

.container {
  max-width: 1100px;
  margin: 50px auto;
  padding: 0 20px;
}

.container h2 {
  text-align: center;
  margin-bottom: 30px;
}

.cards {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.card {
  flex: 1;
  min-width: 260px;
  background: white;
  padding: 25px;
  border-radius: 14px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.card h3 {
  margin-top: 0;
}

.card a {
  display: inline-block;
  margin-top: 10px;
  color: #1e3c72;
  font-weight: bold;
}

footer {
  text-align: center;
  padding: 30px;
  background: #111;
  color: #aaa;
}