:root{
  --bg:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:#e5e7eb;
  --accent:#4f46e5;
  --card:#f9fafb;
  --radius:16px;
  --max:980px;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
}

a{color:inherit;text-decoration:none;}
a:hover{opacity:.85;}

.container{max-width:var(--max);margin:0 auto;padding:24px;}
.nav{
  position:sticky; top:0; background:rgba(255,255,255,.9);
  backdrop-filter: blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;}
.logo{
  width:34px;height:34px;border-radius:10px;background:var(--accent);
  display:grid;place-items:center;color:#fff;font-weight:900;
}
.menu{display:flex;gap:14px;flex-wrap:wrap;}
.menu a{padding:10px 10px;border-radius:12px;color:var(--muted);}
.menu a.active, .menu a:hover{background:var(--card);color:var(--text);}

.hero{
  padding:48px 0 24px;
}
.badge{
  display:inline-flex;gap:8px;align-items:center;
  padding:8px 12px;border:1px solid var(--line);border-radius:999px;
  color:var(--muted);background:#fff;
}
h1{font-size:42px;line-height:1.15;margin:14px 0 10px;}
.lead{font-size:18px;color:var(--muted);max-width:60ch;}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 16px;border-radius:14px;border:1px solid var(--line);
  background:#fff;font-weight:700;
}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;}
.btn.ghost{background:var(--card);}

.grid{
  display:grid;gap:14px;
  grid-template-columns: repeat(12, 1fr);
  margin:26px 0 10px;
}
.card{
  grid-column: span 12;
  border:1px solid var(--line);background:#fff;border-radius:var(--radius);
  padding:18px;
}
.card.soft{background:var(--card);}
.kicker{color:var(--muted);font-weight:700;font-size:13px;letter-spacing:.06em;text-transform:uppercase;}
.h2{font-size:22px;margin:8px 0 6px;}
.p{color:var(--muted);margin:0;}
.meta{margin-top:10px;color:var(--muted);font-size:14px;}

.split{display:grid;gap:14px;grid-template-columns:1fr;}
@media(min-width:860px){
  .card.span6{grid-column:span 6;}
  .card.span4{grid-column:span 4;}
  .split{grid-template-columns:1.2fr .8fr;}
  h1{font-size:52px;}
}

.hr{border-top:1px solid var(--line);margin:24px 0;}
.footer{color:var(--muted);font-size:14px;padding:30px 0;}
.small{font-size:13px;color:var(--muted);}