body {
  display: flex;
  flex-direction: column;
  justify-content: space-between; /* 内容和底部分开 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #fff;
  color: #333;
  text-align: center;
}

.container {
  flex: 1; /* 占满中间空间 */
  padding: 40px 20px;
}

.logo {
  width: 120px;
  height: 120px;
  margin: 40px auto 20px;
  border-radius: 24px; /* 圆角 */
  box-shadow: 0px 4px 12px 0px rgba(0,0,0,0.15);
  border-radius: 25px;
  border: 1px solid rgba(0,0,0,0.08);
}

.title {
  font-size: 22px;
  font-weight: bold;
  margin: 10px 0;
}

.desc {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
  margin: 10px auto 30px;
  max-width: 320px;
}

.btn {
  display: block;
  width: 220px;
  padding: 14px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  color: #fff !important;
  text-align: center;
}

.btn-android {
  /* background: linear-gradient(90deg, #ff7b00, #ff5000); */
  margin: 15px auto;
}

.btn-ios {
  background: #000;
  margin: 0 auto;
}

.btn img {
  vertical-align: middle;
  margin-right: 8px;
  height: 20px;
}

.footer {
  position: fixed; /* 固定定位 */
  bottom: 18px; /* 紧贴页面底部 */
  left: 0;
  width: 100%; /* 占满宽度 */
  font-size: 12px;
  color: #999;
  display: flex; 
  justify-content: center;
  padding: 10px 0;
  background: #fff; /* 底部留白背景，避免文字看不清 */
}

.footer a {
  /* color: #ff6600; */
  text-decoration: none;
}