:root {
  color-scheme: light;
  --text: #1c1b19;
  --muted: #5c574e;
  --line: #e4dfd6;
  --bg: #f7f6f3;
  --paper: #fffdf9;
  --link: #0b57d0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 1.05rem;
  line-height: 1.75;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  background: var(--paper);
  min-height: 100vh;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.7rem;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

h2 {
  margin: 2rem 0 0.6rem;
  font-size: 1.15rem;
  line-height: 1.4;
}

p,
li {
  margin: 0.4rem 0;
}

ul {
  padding-left: 1.2rem;
}

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

.lead,
.meta {
  color: var(--muted);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 1.25rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

footer {
  margin-top: 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}