:root{
  --bg:#0f1115; --card:#171a21; --fg:#e8eaed; --muted:#9aa0a6;
  --accent:#3b82f6; --accent2:#f59e0b; --line:#262a33; --radius:14px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",Segoe UI,Roboto,sans-serif;
  line-height:1.75; font-size:16px;
}
a{color:var(--accent); text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:760px; margin:0 auto; padding:24px 18px 64px}
header.site{display:flex; align-items:center; gap:10px; padding:18px 0; border-bottom:1px solid var(--line); margin-bottom:8px}
.logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:18px}
.brand{font-weight:800;font-size:20px;letter-spacing:.3px}
nav.site a{color:var(--muted); margin-left:14px; font-size:14px}
nav.site a:hover{color:var(--fg)}
h1{font-size:30px; line-height:1.3; margin:26px 0 6px}
h2{font-size:20px; margin:30px 0 8px; padding-top:6px}
h3{font-size:16px; margin:18px 0 4px; color:var(--accent)}
p,li{color:var(--fg)}
.muted{color:var(--muted)}
.lead{color:var(--muted); font-size:16px}
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:18px 18px; margin:16px 0}
ul{padding-left:20px} li{margin:4px 0}
.badge{display:inline-block; font-size:12px; color:var(--muted); border:1px solid var(--line); border-radius:999px; padding:3px 10px; margin:2px 4px 2px 0}
.btns{display:flex; flex-wrap:wrap; gap:10px; margin:18px 0}
.btn{display:inline-block; background:var(--accent); color:#fff; padding:11px 18px; border-radius:10px; font-weight:700}
.btn.alt{background:transparent; border:1px solid var(--line); color:var(--fg)}
.btn:hover{text-decoration:none; opacity:.92}
.hr{height:1px;background:var(--line);border:0;margin:28px 0}
.langbar{display:flex;gap:8px;margin:8px 0 0}
.langbar a{font-size:13px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 12px}
footer.site{border-top:1px solid var(--line); margin-top:40px; padding-top:18px; color:var(--muted); font-size:13px}
footer.site a{color:var(--muted)}
.small{font-size:13px}
code{background:#0b0d11;border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:13px}
.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}
@media (max-width:560px){.feature-grid{grid-template-columns:1fr}}
.feature{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.feature b{display:block;margin-bottom:2px}
.feature span{color:var(--muted);font-size:14px}