:root {
  --canvas: #f7f4ee;
  --surface: #ffffff;
  --ink: #11161a;
  --ink2: #3d4549;
  --ink3: #8b95a1;
  --accent: #3a8a64;
  --accent-ink: #1e5c3e;
  --hairline: #e5e0d8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  background: var(--canvas);
  color: var(--ink);
  line-height: 1.9;
  font-size: 15px;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

header.site {
  margin-bottom: 40px;
}

header.site a.brand {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent-ink);
  text-decoration: none;
}

header.site .brand-sub {
  font-size: 12px;
  color: var(--ink3);
  letter-spacing: 0.08em;
  margin-top: 2px;
}

h1 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.meta {
  font-size: 12px;
  color: var(--ink3);
  margin-bottom: 32px;
}

h2 {
  font-size: 17px;
  font-weight: 700;
  margin: 40px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
}

h3 {
  font-size: 15px;
  font-weight: 700;
  margin: 20px 0 8px;
  color: var(--ink2);
}

p {
  margin-bottom: 12px;
  color: var(--ink2);
}

ul, ol {
  margin: 0 0 12px;
  padding-left: 1.4em;
  color: var(--ink2);
}

li {
  margin-bottom: 6px;
}

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

.note {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 16px 18px;
  font-size: 13px;
  color: var(--ink2);
  margin: 16px 0;
}

footer.site {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  font-size: 12px;
  color: var(--ink3);
}

footer.site nav {
  margin-bottom: 8px;
}

footer.site nav a {
  color: var(--ink3);
  margin-right: 16px;
}

/* landing */
.hero {
  text-align: center;
  padding: 48px 0 24px;
}

.hero .mark {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--accent-ink);
}

.hero .tagline {
  margin-top: 16px;
  font-size: 15px;
  color: var(--ink2);
}

.hero .desc {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink3);
}

.links {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.links a {
  display: inline-block;
  padding: 10px 22px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink2);
  text-decoration: none;
  font-size: 13px;
}