:root {
  --bg: #F5F7FA;
  --surface: #FFFFFF;
  --primary: #28406E;
  --teal: #14A396;
  --text: #1A1F26;
  --muted: #5E6672;
  --border: #E3E8EF;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 22px; }
header.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--teal) 100%);
  color: #fff;
  padding: 64px 0 56px;
  text-align: center;
}
header.hero .badge {
  width: 84px; height: 84px; border-radius: 21px;
  background: rgba(255,255,255,.16);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 44px; margin-bottom: 18px;
  border: 1px solid rgba(255,255,255,.28);
}
header.hero h1 { font-size: 38px; font-weight: 800; letter-spacing: -.02em; }
header.hero p { font-size: 18px; opacity: .92; margin-top: 10px; }
nav.top {
  background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
nav.top .wrap { display: flex; gap: 22px; align-items: center; height: 54px; }
nav.top a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: 15px; }
nav.top a:hover, nav.top a.active { color: var(--primary); }
nav.top .brand { color: var(--primary); font-weight: 800; margin-right: auto; }
main { padding: 48px 0 80px; }
section { margin-bottom: 40px; }
h2 { font-size: 24px; font-weight: 800; color: var(--primary); margin-bottom: 14px; letter-spacing: -.01em; }
h3 { font-size: 17px; font-weight: 700; margin: 22px 0 8px; }
p { margin-bottom: 12px; color: var(--text); }
.muted { color: var(--muted); }
.lead { font-size: 18px; }
ul.feat { list-style: none; display: grid; gap: 12px; margin: 18px 0; }
ul.feat li {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 16px 18px; display: flex; gap: 14px; align-items: flex-start;
}
ul.feat li .ic { font-size: 22px; line-height: 1.2; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 22px 24px; margin: 16px 0;
}
.ja { color: var(--muted); font-size: 14px; display: block; margin-top: 3px; }
a.btn {
  display: inline-block; background: var(--teal); color: #fff; text-decoration: none;
  padding: 13px 26px; border-radius: 12px; font-weight: 700; margin-top: 8px;
}
.divider { height: 1px; background: var(--border); margin: 32px 0; border: 0; }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 32px 0 48px; }
footer a { color: var(--muted); }
.updated { font-size: 13px; color: var(--muted); margin-bottom: 26px; }
@media (max-width: 520px) {
  header.hero h1 { font-size: 30px; }
  nav.top .wrap { gap: 16px; }
}