:root{
  --bg:#f7f6f3;
  --panel:#ffffff;
  --text:#1f2430;
  --muted:#6b7280;
  --line:#e7e5df;
  --accent:#5b6c9b;
  --accent-soft:#eef2ff;
  --max:1080px;
  --radius:16px;
  --shadow:0 10px 30px rgba(24,24,24,.05);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: -apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic UI","Yu Gothic",Meiryo,system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.site-header{
  position:sticky; top:0; z-index:20;
  backdrop-filter: blur(10px);
  background:rgba(247,246,243,.8);
  border-bottom:1px solid rgba(231,229,223,.9);
}
.site-header .inner{display:flex;align-items:center;justify-content:space-between;min-height:64px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;color:var(--text)}
.brand-mark{width:28px;height:28px}
.nav{display:flex;gap:16px;flex-wrap:wrap}
.nav a{color:var(--muted);font-size:.95rem}
.nav a.active{color:var(--text);font-weight:600}
.hero{padding:72px 0 40px}
.hero-card,.card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-card{padding:36px}
.badge{
  display:inline-block;padding:6px 10px;border-radius:999px;
  background:var(--accent-soft);color:var(--accent);font-size:.8rem;font-weight:700;
}
h1,h2,h3{line-height:1.25;margin:0 0 16px}
h1{font-size:clamp(2rem,3.6vw,3.4rem)}
h2{font-size:clamp(1.4rem,2.2vw,2rem);margin-top:12px}
h3{font-size:1.1rem}
.lead{font-size:1.08rem;color:#323848;max-width:52rem}
.grid{display:grid;gap:20px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.section{padding:28px 0}
.card{padding:24px}
.kicker{font-size:.9rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.list{padding-left:1.1rem;margin:0}
.list li{margin:.2rem 0}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 16px;border-radius:12px;border:1px solid var(--line);
  background:var(--panel);color:var(--text);font-weight:600;
}
.button.primary{background:var(--text);color:#fff;border-color:var(--text)}
.note{font-size:.95rem;color:var(--muted)}
.lang-switch{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.footer{padding:34px 0 56px;color:var(--muted);font-size:.92rem}
hr.sep{border:none;border-top:1px solid var(--line);margin:24px 0}
code.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;background:#f3f4f6;padding:2px 6px;border-radius:6px}
@media (max-width: 860px){
  .grid.two,.grid.three{grid-template-columns:1fr}
  .site-header .inner{align-items:flex-start;padding:10px 0}
  .nav{padding:8px 0}
}