:root {
  --bg: #fbfcff;
  --surface: #eef3fd;
  --text: #1a1c22;
  --muted: #5a6072;
  --accent: #3f62a0;
  --line: #d5dcec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101828;
    --surface: #1a2438;
    --text: #e6e9f2;
    --muted: #a4acc0;
    --accent: #a9c4f5;
    --line: #2c3854;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  line-height: 1.8;
}
main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}
header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}
header img {
  width: 64px;
  height: 64px;
  border-radius: 16px;
}
h1 {
  font-size: 1.75rem;
  margin: 0;
  line-height: 1.3;
}
h2 {
  font-size: 1.15rem;
  margin: 2.25rem 0 0.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
p,
ul {
  margin: 0.5rem 0;
}
ul {
  padding-left: 1.25rem;
}
a {
  color: var(--accent);
}
.lead {
  color: var(--muted);
}
.note {
  background: var(--surface);
  border-radius: 12px;
  padding: 0.75rem 1rem;
}
footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}