:root {
  --navy: #061a31;
  --blue: #1477be;
  --muted: #536779;
  --line: #dce7ef;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--navy);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: #fff;
}
a { color: inherit; text-decoration: none; }
.article-head {
  padding: 0 24px 68px;
  color: #fff;
  background: radial-gradient(circle at 82% 15%, #176da8 0, transparent 31%), linear-gradient(120deg, #061a31, #0a3a5e);
}
.article-nav,
.article-wrap {
  width: min(900px, 100%);
  margin: auto;
}
.article-nav {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, .2);
}
.brand { font-weight: 800; letter-spacing: .06em; }
.brand span { color: #8bdcff; font-weight: 500; }
.back { color: #d5efff; font-size: 14px; }
.article-label {
  margin-top: 58px;
  color: #91ddff;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .15em;
}
.article-head h1 {
  max-width: 850px;
  margin: 16px 0 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.28;
}
.article-main { padding: 62px 24px 88px; }
.article-main .lead {
  margin: 0;
  padding: 0 0 32px;
  color: #38566f;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.95;
  border-bottom: 1px solid var(--line);
}
.article-section { margin-top: 42px; }
.article-section h2 {
  margin: 0 0 18px;
  color: var(--navy);
  font-size: 26px;
  line-height: 1.5;
}
.article-section h3 {
  margin: 27px 0 10px;
  color: #0e6da8;
  font-size: 19px;
}
.article-section p {
  margin: 0 0 17px;
  color: var(--muted);
  font-size: 16px;
  line-height: 2;
}
.article-footer-link {
  display: inline-block;
  margin-top: 46px;
  padding: 12px 19px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 700;
  border: 1px solid #bcdced;
}
.site-footer {
  padding: 26px 24px;
  color: #b8d4e4;
  text-align: center;
  font-size: 13px;
  background: var(--navy);
}
@media (max-width: 700px) {
  .article-head { padding: 0 20px 52px; }
  .article-nav { height: 68px; }
  .article-nav .brand span { display: none; }
  .article-label { margin-top: 42px; }
  .article-main { padding: 45px 22px 64px; }
  .article-main .lead { font-size: 17px; }
  .article-section { margin-top: 34px; }
  .article-section h2 { font-size: 22px; }
  .article-section p { font-size: 15px; }
}