:root {
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --bg: #ffffff;
  --accent: #0a84ff;
  --card: #f5f5f7;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
}
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}
header.site {
  border-bottom: 1px solid #e5e5ea;
}
header.site .wrap { padding-bottom: 24px; padding-top: 24px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 2rem; letter-spacing: -0.02em; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 40px 0 12px; }
h3 { font-size: 1.05rem; margin: 28px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
.lead { font-size: 1.1rem; color: var(--muted); margin-top: 0; }
nav.crumb { font-size: 0.9rem; margin-bottom: 32px; }
nav.crumb a { color: var(--muted); }
.card {
  background: var(--card);
  border-radius: 14px;
  padding: 20px 24px;
  margin: 20px 0;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 22px;
  border-radius: 980px;
  font-weight: 600;
  margin-top: 8px;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
footer {
  border-top: 1px solid #e5e5ea;
  color: var(--muted);
  font-size: 0.85rem;
}
footer .wrap { padding: 24px; }
ul { padding-left: 1.2em; }
.app-list { list-style: none; padding: 0; }
.app-list li { padding: 16px 0; border-bottom: 1px solid #e5e5ea; }