* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: #ffffff;
  color: #1a1a1a;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.55;
}

a {
  color: #1a1a1a;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr) 320px;
  gap: 20px;
  padding: 18px;
}

.toc {
  position: sticky;
  top: 16px;
  align-self: start;
  max-height: calc(100vh - 32px);
  overflow: auto;
  border: 1px solid #d8d8d8;
  padding: 14px;
  font-size: 13px;
  background: #fff;
}

.toc h2 {
  margin: 0 0 12px 0;
  font-size: 15px;
}

.toc ol {
  margin: 0;
  padding-left: 18px;
}

.toc li {
  margin: 4px 0;
}

.article {
  min-width: 0;
}

.article h1 {
  margin-top: 0;
  margin-bottom: 8px;
  line-height: 1.2;
  font-size: 54px;
}

.article .subtitle {
  margin-top: 0;
  margin-bottom: 24px;
  color: #4f4f4f;
  font-size: 14px;
}

.article h2 {
  margin-top: 40px;
  margin-bottom: 12px;
  font-size: 34px;
  line-height: 1.25;
  border-bottom: 1px solid #ececec;
  padding-bottom: 6px;
}

.article h3 {
  margin-top: 28px;
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.3;
}

.article p {
  margin: 0 0 16px;
  font-size: 17px;
}

.article ul {
  margin-top: 0;
  margin-bottom: 18px;
}

.article li {
  margin: 6px 0;
  font-size: 16px;
}

.infobox {
  position: sticky;
  top: 16px;
  align-self: start;
  border: 1px solid #d8d8d8;
  background: #fff;
}

.infobox h2 {
  margin: 0;
  padding: 10px 12px;
  text-align: center;
  font-size: 18px;
  border-bottom: 1px solid #d8d8d8;
  background: #f6f6f6;
}

.infobox table {
  width: 100%;
  border-collapse: collapse;
}

.infobox th,
.infobox td {
  border-bottom: 1px solid #e6e6e6;
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
  font-size: 13px;
}

.infobox th {
  width: 42%;
  font-weight: 700;
}

.lead-box {
  border: 1px solid #d8d8d8;
  background: #fafafa;
  padding: 14px;
  margin-bottom: 20px;
}

.footer-note {
  margin-top: 36px;
  padding-top: 14px;
  border-top: 1px solid #ececec;
  font-size: 14px;
  color: #555;
}

@media (max-width: 1200px) {
  .page {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .infobox {
    position: static;
  }
}

@media (max-width: 900px) {
  .page {
    grid-template-columns: 1fr;
  }

  .toc,
  .infobox {
    position: static;
    max-height: none;
  }

  .article h1 {
    font-size: 34px;
  }

  .article p,
  .article li {
    font-size: 16px;
  }
}