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

html,
body {
  min-height: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 36px 0;
  box-sizing: border-box;
  background: #4b63c8 url(../images/login_bg.jpg) center center / cover no-repeat fixed;
  color: #222;
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 2;
}

.paper {
  width: min(720px, calc(100% - 32px));
  height: fit-content;
  margin: auto;
  padding: 56px 64px 64px;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 12px 32px rgba(20, 30, 90, 0.28);
}

.doc-title {
  margin: 0 0 32px;
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: 0.5px;
}

.paper p {
  margin: 0;
  text-align: justify;
  text-justify: inter-ideograph;
  text-indent: 2em;
}

.paper .salute {
  text-indent: 0;
  text-align: left;
}

.paper .sign {
  margin-top: 1.5em;
  text-align: right;
}

.paper .sign p {
  text-indent: 0;
  text-align: right;
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .paper {
    width: calc(100% - 16px);
    margin: 20px auto;
    padding: 28px 18px 36px;
  }

  .doc-title {
    font-size: 18px;
    margin-bottom: 22px;
  }
}

@media print {
  body {
    background: #fff;
  }

  .paper {
    width: auto;
    margin: 0;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
  }
}