:root {
  --text: #20242a;
  --muted: #5b6673;
  --line: #d8dee6;
  --link: #1f5f8b;
  --soft: #f7f9fb;
  --paper: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.62;
}

a {
  color: var(--link);
}

.page {
  display: grid;
  grid-template-columns: 220px minmax(0, 880px);
  gap: 48px;
  width: min(1180px, calc(100% - 44px));
  margin: 0 auto;
  padding: 42px 0 54px;
}

.toc {
  position: sticky;
  top: 28px;
  align-self: start;
  padding: 4px 22px 4px 0;
  border-right: 1px solid var(--line);
}

.site-title {
  display: block;
  margin-bottom: 24px;
  color: var(--text);
  font-weight: 700;
  line-height: 1.35;
  text-decoration: none;
}

nav {
  display: grid;
  gap: 9px;
  font-size: 0.95rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}

nav a:hover {
  color: var(--link);
  text-decoration: underline;
}

main {
  min-width: 0;
}

.label {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 850px;
  margin-bottom: 18px;
  font-size: 2.35rem;
  line-height: 1.16;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 17px;
  padding-bottom: 8px;
  font-size: 1.42rem;
  line-height: 1.28;
  border-bottom: 1px solid var(--line);
}

.subtitle {
  max-width: 820px;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 1.05rem;
}

.quick-info {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 30px;
  margin: 24px 0 40px;
  padding: 12px 18px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.quick-info div {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px solid #e9edf2;
}

.quick-info div:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.quick-info strong {
  color: var(--muted);
  font-size: 0.94rem;
}

section {
  margin: 0 0 40px;
}

.prose {
  max-width: 840px;
}

p {
  margin-bottom: 15px;
}

ul {
  margin: 0 0 12px;
  padding-left: 24px;
}

li {
  margin-bottom: 6px;
}

.overview-figure {
  margin: 18px 0 26px;
  padding: 14px;
  background: #fbfcfd;
  border: 1px solid var(--line);
}

.overview-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.overview-figure figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.date-list {
  margin: 0;
}

.date-list div {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 20px;
  padding: 7px 0;
  border-bottom: 1px solid #eaeef2;
}

dt {
  color: var(--muted);
  font-weight: 700;
}

dd {
  margin: 0;
}

footer {
  margin-top: 48px;
  padding-top: 18px;
  color: var(--muted);
  font-size: 0.92rem;
  border-top: 1px solid var(--line);
}

footer p {
  margin-bottom: 6px;
}

@media (max-width: 900px) {
  .page {
    display: block;
    width: min(100% - 32px, 880px);
    padding-top: 28px;
  }

  .toc {
    position: static;
    padding: 0 0 18px;
    margin-bottom: 28px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
  }

  h1 {
    font-size: 1.9rem;
  }

  .quick-info,
  .quick-info div,
  .date-list div {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .quick-info div:nth-last-child(-n + 2) {
    border-bottom: 1px solid #e9edf2;
  }

  .quick-info div:last-child {
    border-bottom: 0;
  }

  .overview-figure {
    padding: 8px;
  }
}