:root {
  color-scheme: light;
  --article-ink: #173b3b;
  --article-muted: #5e716f;
  --article-line: #d7e3df;
  --article-accent: #00606a;
  --article-surface: #ffffff;
  --article-background: #f4f8f5;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--article-background);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--article-ink);
  background: var(--article-background);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a {
  color: var(--article-accent);
}

.research-article-header,
main,
.research-article-footer {
  width: min(960px, calc(100% - 36px));
  margin-inline: auto;
}

.research-article-header {
  padding: 34px 0 24px;
}

.research-article-nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 42px;
  font-size: 14px;
  font-weight: 760;
}

.research-article-kicker {
  margin: 0 0 10px;
  color: var(--article-accent);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 820px;
  margin: 0;
  color: var(--article-ink);
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.2;
  letter-spacing: 0;
}

.research-article-summary {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--article-muted);
  font-size: clamp(17px, 2.2vw, 21px);
}

.research-article-scope {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--article-muted);
  font-size: 13px;
}

.research-article-body {
  overflow: hidden;
  padding: clamp(24px, 4vw, 54px);
  border: 1px solid var(--article-line);
  background: var(--article-surface);
  box-shadow: 0 18px 45px rgba(25, 71, 62, 0.08);
}

.research-article-body p {
  max-width: 78ch;
  margin: 0 auto 1.1em;
  color: #274545;
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0;
  text-align: left !important;
}

.research-article-body h2,
.research-article-body h3,
.research-article-body h4 {
  max-width: 78ch;
  margin: 1.8em auto 0.65em;
  color: var(--article-ink);
  line-height: 1.35;
}

.research-article-body h2 {
  font-size: clamp(24px, 3vw, 34px);
}

.research-article-body h3 {
  font-size: 23px;
}

.research-article-body h4 {
  font-size: 19px;
}

.research-article-body img {
  display: block;
  max-width: 100%;
  height: auto !important;
  margin: 18px auto;
}

.research-article-body section {
  max-width: 100%;
}

.research-article-footer {
  padding: 24px 0 42px;
  color: var(--article-muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .research-article-header,
  main,
  .research-article-footer {
    width: min(100% - 24px, 960px);
  }

  .research-article-header {
    padding-top: 22px;
  }

  .research-article-nav {
    margin-bottom: 30px;
  }

  .research-article-body {
    padding: 20px 16px;
  }

  .research-article-body p {
    font-size: 16px;
  }
}