:root{--bg:#f7f8fa;--fg:#1d2330;--muted:#5b6475;--accent:#2f6fed;--card:#fff;--line:#e3e6ec}
@media (prefers-color-scheme:dark){:root{--bg:#12151b;--fg:#e8ebf1;--muted:#a1a9b8;--accent:#6b9bff;--card:#1a1f27;--line:#2a303b}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent);text-decoration:none}
.wrap{max-width:960px;margin:0 auto;padding:0 16px}
.top{display:flex;align-items:center;justify-content:space-between;padding-top:20px;padding-bottom:20px;flex-wrap:wrap;gap:12px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--fg);font-size:18px}
nav{display:flex;gap:18px}
nav a{color:var(--muted)}
.hero{padding-top:40px;padding-bottom:24px}
.hero h1{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:0 0 12px}
.hero p{color:var(--muted);max-width:620px;font-size:18px}
.hero-img{display:block;width:100%;max-width:640px;height:auto;margin-top:24px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;padding-top:24px;padding-bottom:24px}
.grid div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.grid h3{margin:0 0 6px}
.grid p{margin:0;color:var(--muted)}
.how{padding-top:16px;padding-bottom:40px}
.how ol{color:var(--muted)}
.text{padding-top:24px;padding-bottom:40px;max-width:720px}
.foot{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:20px;padding-bottom:28px;color:var(--muted);font-size:14px}