:root {
  --bg: #000000;
  --text: #f5f5f7;
  --muted: #86868b;
  --link: #2997ff;
  --link-active: #64d2ff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.article {
  flex: 1;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 22px 48px;
}

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

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

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

a.back {
  text-decoration: none;
  font-size: 14px;
  color: var(--muted);
}

a.back:hover {
  color: var(--link);
}

a.back:active {
  color: var(--link-active);
}

h1 {
  margin: 28px 0 10px;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.meta {
  margin: 0 0 32px;
  font-size: 13px;
  color: var(--muted);
}

h2 {
  margin: 32px 0 10px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p,
li {
  margin: 0 0 12px;
  font-size: 15px;
}

ul {
  margin: 0 0 12px;
  padding-left: 1.2em;
}

footer {
  padding: 8px 24px 32px;
  text-align: center;
  font-size: 12px;
  letter-spacing: -0.01em;
  color: var(--muted);
}

footer a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 40px;
}

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

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