:root {
  --bg: #ffffff;
  --fg: #000000;
  --muted: #444444;
  --card: #ffffff;
  --border: #dddddd;
  --link: #0b66c3;
  --radius: 8px;
  --maxw: 900px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Noto Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic",
    Meiryo, Arial, sans-serif;
  line-height: 1.65;
  background: var(--bg);
  color: var(--fg);
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  padding: 20px 16px;
  margin: 0 auto;
}

.content {
  padding-top: 16px;
  padding-bottom: 40px;
}

.top {
  margin: 0 0 18px;
}

.top__title {
  font-weight: 800;
  font-size: 18px;
}

.top__sub {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.top__nav {
  margin-top: 10px;
  font-size: 14px;
}

.sep {
  color: var(--muted);
  margin: 0 8px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  margin: 18px 0;
}

.title {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.25;
}

.meta {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
}

h2 {
  margin: 20px 0 8px;
  font-size: 18px;
}

h3 {
  margin: 16px 0 8px;
  font-size: 16px;
}

ul {
  margin: 8px 0 0;
  padding-left: 22px;
}

li {
  margin: 6px 0;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 18px 0;
}

.footer {
  margin-top: 14px;
  text-align: center;
}

.footer__text {
  color: var(--muted);
  font-size: 12px;
  margin: 0;
}