:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: #1f2329;
  background: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  background: #ffffff;
}

body {
  margin: 0;
  background: #ffffff;
  line-height: 1.7;
}

.document {
  width: min(820px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 110px;
}

h1 {
  margin: 0;
  font-size: 36px;
  line-height: 1.35;
  font-weight: 700;
}

.updated {
  margin: 12px 0 34px;
  color: #8f959e;
  font-size: 13px;
}

.lead {
  margin: 0 0 20px;
  font-size: 18px;
}

h2 {
  margin: 22px 0 10px;
  font-size: 20px;
  line-height: 1.6;
  font-weight: 650;
}

.step-title {
  font-size: 24px;
}

p {
  margin: 8px 0;
  font-size: 16px;
}

a {
  color: #3370ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.document > img {
  width: 100%;
  height: auto;
  margin: 12px 0;
  display: block;
  border: 0;
}

.file-card {
  width: 400px;
  max-width: 100%;
  min-height: 66px;
  margin: 14px 0;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #1f2329;
  border: 1px solid #dee0e3;
  border-radius: 4px;
  background: #ffffff;
}

.file-card:hover {
  border-color: #a8abb2;
  background: #f7f8fa;
  text-decoration: none;
}

.file-icon {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  color: #ffffff;
  border-radius: 3px;
  background: #4c80f1;
  font-size: 10px;
  font-weight: 700;
}

.file-info {
  min-width: 0;
  flex: 1;
}

.file-info strong,
.file-info small {
  display: block;
}

.file-info strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 500;
}

.file-info small {
  margin-top: 1px;
  color: #8f959e;
  font-size: 12px;
}

.download-icon {
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  display: grid;
  place-items: center;
  color: #646a73;
  border-radius: 3px;
  font-size: 18px;
}

.wechat {
  margin: 4px 0;
  font-size: 18px;
  font-weight: 600;
}

@media (max-width: 640px) {
  .document {
    width: calc(100% - 28px);
    padding: 36px 0 72px;
  }

  h1 {
    font-size: 30px;
  }

  .updated {
    margin-bottom: 28px;
  }

  .lead {
    font-size: 17px;
  }

  h2 {
    font-size: 18px;
  }

  .step-title {
    font-size: 21px;
  }

  p {
    font-size: 15px;
  }

  .document > img {
    margin: 9px 0;
  }
}