:root{
  --bg:#0f1115;--fg:#e8e8ea;--muted:#9a9ca3;--accent:#7cc4ff;--card:#171a21;--line:#262a33;
  --max:960px;
}
@media (prefers-color-scheme: light){
  :root{--bg:#fafafa;--fg:#1a1a1a;--muted:#5f6368;--accent:#0b63c9;--card:#fff;--line:#e3e5e8}
}
*{box-sizing:border-box}
html{color-scheme:light dark}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI","Hiragino Sans","Noto Sans JP",sans-serif;background:var(--bg);color:var(--fg);line-height:1.7}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{display:flex;justify-content:space-between;align-items:center;max-width:var(--max);margin:0 auto;padding:20px 24px}
.brand{font-weight:700;color:var(--fg);letter-spacing:.04em}
nav a{margin-left:20px;color:var(--muted)}
main{max-width:var(--max);margin:0 auto;padding:0 24px 64px}
.hero{padding:64px 0 40px}
.eyebrow{color:var(--muted);text-transform:uppercase;letter-spacing:.15em;font-size:.8rem;margin:0 0 8px}
h1{font-size:clamp(1.8rem,4vw,2.8rem);margin:0 0 12px;line-height:1.3}
.lead{color:var(--muted);font-size:1.1rem;margin:0}
section{padding:32px 0;border-top:1px solid var(--line)}
h2{font-size:1.2rem;letter-spacing:.06em;margin:0 0 16px}
.grid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.card h3{margin:0 0 8px;font-size:1rem}
.card p{margin:0 0 8px;color:var(--muted);font-size:.95rem}
.site-footer{max-width:var(--max);margin:0 auto;padding:24px;color:var(--muted);border-top:1px solid var(--line)}