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

html, body { height: 100%; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: #b9d7ef url("bg.jpg") no-repeat center center;
  background-size: cover;
  background-attachment: fixed;
}

.screen {
  min-height: 100vh;
  display: flex;
  /*align-items: center;*/
  justify-content: center;
  padding:160px 5vw 40px 5vw;
}

.box { width: 100%; max-width: 1360px; }

.title {
  text-align: center;
  color: #0177d1;
  font-size: 50px;
  font-weight: 600;
  letter-spacing: 2px;
}

.line {
  display: block;
  width: 100%;
  margin: 26px 0 40px;
}

.salutation {
  font-size: 30px;
  line-height: 1.8;
  color: #010000;
  font-weight:500;
  font-family: 'SourceHanSansSC Medium', "Microsoft Yahei", sans-serif;
}

.text {
  margin-top: 10px;
  font-size: 27px;
  line-height: 1.8;
  color: #010000;
  text-indent: 2em;
}

.entry {
  display: flex;
  flex-wrap: wrap;
   justify-content: center;
  gap: 34px;
  margin-top: 46px;
}

.btn {
  flex: 1 1 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 22px 30px;
  border-radius: 999px;
  background: #fff;
  text-decoration: none;
  transition: box-shadow 0.25s, transform 0.25s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(28, 82, 160, 0.22);
}

.btn-label {
  font-size: 24px;
  color: #1a1a1a;
}

.btn-link {
  font-size: 24px;
  color: #0177d1;
}

.arrow {
  flex: none;
  width: 20px;
  height: 20px;
}

@media (max-width: 768px) {
  body{background-image:url("m_bg.jpg");}
  .screen{padding:60px 5vw 40px 5vw;}
  .title { font-size: 26px; }
  .line { margin: 16px 0 24px; }
  .salutation, .text { font-size: 16px; }
  .entry { margin-top: 28px; gap: 15px; }
  .btn { padding: 14px 16px; }
  .btn-label, .btn-link { font-size: 14px; }
  .arrow { width: 16px; height: 16px; }
}