:root{--bg:#fbfaf7;--fg:#1f2328;--muted:#5b6370;--line:#e4e1da;--card:#ffffff;--accent:#2563c9;--accent-soft:#e8f0fc}
@media (prefers-color-scheme:dark){:root{--bg:#15171a;--fg:#e8e6e1;--muted:#a3a9b3;--line:#2c3036;--card:#1d2024;--accent:#7aa7f0;--accent-soft:#1f2a3b}}
*{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","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",sans-serif;line-height:1.8;font-size:16px}
a{color:var(--accent)}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px;flex-wrap:wrap}
header.site .brand{font-weight:700;color:var(--fg);text-decoration:none}
header.site nav a{color:var(--muted);text-decoration:none;margin-left:16px;font-size:14px}
header.site nav a:first-child{margin-left:0}
main{padding:40px 0 56px}
h1{font-size:28px;line-height:1.4;margin:0 0 16px}
h2{font-size:21px;margin:48px 0 12px;padding-top:8px}
h3{font-size:17px;margin:28px 0 8px}
p,ul,ol{margin:0 0 14px}
.lead{font-size:18px;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px}
.app{display:flex;gap:16px;align-items:flex-start}
.app img{width:72px;height:72px;border-radius:16px;flex:none}
.hero{display:flex;gap:20px;align-items:center;margin-bottom:24px}
.hero img{width:96px;height:96px;border-radius:22px;flex:none}
.hero h1{margin:0}
.hero p{margin:4px 0 0;color:var(--muted)}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:10px 18px;border-radius:999px;font-weight:600;font-size:15px}
@media (prefers-color-scheme:dark){.btn{color:#10151d}}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:16px 0}
.features .card h3{margin:0 0 6px}
.features .card p{margin:0;color:var(--muted);font-size:15px}
.table-wrap{overflow-x:auto;margin:0 0 16px}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--accent-soft);font-weight:600}
dl.info{display:grid;grid-template-columns:minmax(8em,30%) 1fr;margin:0;border-top:1px solid var(--line)}
dl.info dt,dl.info dd{margin:0;padding:10px 8px;border-bottom:1px solid var(--line)}
dl.info dt{font-weight:600;color:var(--muted)}
@media (max-width:520px){dl.info{grid-template-columns:1fr}dl.info dt{border-bottom:none;padding-bottom:0}}
details{border:1px solid var(--line);border-radius:10px;background:var(--card);margin:0 0 8px}
summary{cursor:pointer;padding:12px 14px;font-weight:600}
details>div{padding:0 14px 6px}
.note{background:var(--accent-soft);border-radius:10px;padding:14px 16px;margin:0 0 16px}
.mail{font-size:20px;font-weight:700}
footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:14px;padding:24px 0 40px}
footer.site a{color:var(--muted);margin-right:14px}
footer.site p{margin:8px 0 0}