*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: '小米兰亭 Pro VF', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: #f0f2f5;
  color: #555;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  padding: 60px 48px;
  text-align: center;
  max-width: 420px;
  width: 90%;
}

.card h1 {
  font-size: 36px;
  color: #333;
  margin-bottom: 16px;
  font-weight: 700;
}

.card p {
  font-size: 15px;
  color: #999;
  margin-bottom: 32px;
  line-height: 1.6;
}

.btn-back {
  display: inline-block;
  padding: 12px 36px;
  background: linear-gradient(135deg, #52bad5, #2C9AB7);
  color: #fff;
  border-radius: 28px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 4px 12px rgba(44, 154, 183, 0.3);
}

.btn-back:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(44, 154, 183, 0.4);
  opacity: 1;
}

.btn-back:active {
  transform: translateY(0);
}