:root{--bg:#000;--fg:#f2f2f2;--dim:#9a9a9a;--line:#2a2a2a;--accent:#fff;--amber:#ffb000}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Noto Sans JP",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}
header.top{display:flex;align-items:center;gap:14px;margin-bottom:28px}
header.top img{width:48px;height:48px;border-radius:11px;border:1px solid var(--line)}
header.top a{color:var(--fg);text-decoration:none;font:700 20px/1 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.08em}
h1{font:700 30px/1.2 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.04em;margin:0 0 6px}
h2{font:700 18px/1.3 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.06em;margin:36px 0 8px;padding-top:14px;border-top:1px solid var(--line)}
h3{font-size:16px;margin:22px 0 4px}
p,li{color:var(--fg)}
.dim{color:var(--dim)}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace}
a{color:var(--accent);text-underline-offset:3px}
ul{padding-left:1.2em}
.lang{display:flex;gap:10px;margin:14px 0 24px}
.lang a{display:inline-block;min-height:44px;min-width:88px;padding:10px 16px;border:1px solid #555;border-radius:10px;text-align:center;text-decoration:none;font:600 15px/1.5 ui-monospace,Menlo,monospace}
.card{border:1px solid var(--line);border-radius:12px;padding:16px;margin:14px 0}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.btn{display:inline-block;min-height:48px;padding:12px 18px;border-radius:10px;background:#fff;color:#000;text-decoration:none;font:700 15px/1.6 ui-monospace,Menlo,monospace}
.btn.ghost{background:transparent;color:#fff;border:1px solid #555}
.readout{font:700 26px/1.2 ui-monospace,Menlo,monospace;letter-spacing:.04em;margin:18px 0}
.readout b{font-size:38px}
table{border-collapse:collapse;width:100%;font-size:15px}
td,th{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
footer{margin-top:48px;padding-top:16px;border-top:1px solid var(--line);color:var(--dim);font-size:14px}