/* アプリと同じ白黒基調。色はいいねの赤だけ。 */
:root {
  --bg: #ffffff;
  --fg: #0f1419;
  --muted: #536471;
  --line: #ebeef0;
  --accent: #e0245e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #e7e9ea;
    --muted: #71767b;
    --line: #2f3336;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI",
    Meiryo, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header.site {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

header.site .inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

header.site a.logo {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--fg);
}

header.site nav {
  margin-left: auto;
  display: flex;
  gap: 14px;
}

header.site nav a {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
}

header.site nav a:hover { color: var(--fg); }

h1 {
  font-size: 1.7rem;
  line-height: 1.5;
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}

h2 {
  font-size: 1.05rem;
  margin: 40px 0 10px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

h3 {
  font-size: 0.95rem;
  margin: 22px 0 6px;
}

p { margin: 0 0 14px; }

ul, ol { margin: 0 0 14px; padding-left: 1.4em; }
li { margin-bottom: 6px; }

.lead {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 28px;
}

.updated {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 32px;
}

.note {
  background: color-mix(in srgb, var(--muted) 8%, transparent);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 0.9rem;
  margin: 0 0 20px;
}

.note strong { display: block; margin-bottom: 4px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 0 0 18px;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px 10px 0;
  border-bottom: 1px solid var(--line);
}

th { width: 34%; font-weight: 700; }

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

/* トップページ */
.hero {
  padding: 56px 0 40px;
  text-align: center;
}

.hero .mark {
  font-size: 3.4rem;
  line-height: 1;
  margin-bottom: 18px;
}

.hero h1 { font-size: 2.1rem; }

.hero p {
  color: var(--muted);
  font-size: 1rem;
  max-width: 30em;
  margin: 0 auto 10px;
}

.points {
  display: grid;
  gap: 14px;
  margin: 40px 0;
}

.point {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 20px;
}

.point b { display: block; margin-bottom: 4px; }

.point span { color: var(--muted); font-size: 0.9rem; }

footer.site {
  border-top: 1px solid var(--line);
  margin-top: 60px;
  padding: 24px 0 60px;
  font-size: 0.82rem;
  color: var(--muted);
}

footer.site .inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

footer.site a { color: var(--muted); }