:root {
  --ink: #17151a;
  --sub: #6b6570;
  --line: #e7e2ea;
  --bg: #fbf8fc;
  --pink: #ffd9f8;
  --black: #0b0b0d;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-weight: 300;
  font-size: 16px;
  line-height: 1.95;
  letter-spacing: 0.05em;
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: 4.5rem 1.6rem 6rem;
}

header {
  padding-bottom: 2.4rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--line);
}

.mark {
  display: inline-block;
  background: var(--black);
  color: var(--pink);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1.4rem;
}

h1 {
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.09em;
  margin: 0 0 0.4rem;
  line-height: 1.7;
}

h2 {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  margin: 3.2rem 0 0.9rem;
  line-height: 1.8;
}

h3 {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin: 2.2rem 0 0.5rem;
}

p { margin: 0 0 1.2rem; }

.lead { color: var(--sub); }

.date {
  color: var(--sub);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

ul {
  margin: 0 0 1.4rem;
  padding-left: 1.2rem;
}

li { margin-bottom: 0.35rem; }

a { color: var(--ink); text-underline-offset: 0.25em; }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 1.4rem 1.6rem;
  margin: 1.4rem 0 2rem;
}

.card p:last-child { margin-bottom: 0; }

nav {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--sub);
}

nav a { margin-right: 1.4rem; }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2eef5;
    --sub: #a49dab;
    --line: #302c35;
    --bg: #141317;
  }
  .card { background: #1c1a20; }
}