:root{--blue:#00C8FF;--pink:#FE0096;--navy:#0F2386;--sub:#5C6A9E;--bg:#FFFFFF;--soft:#F2FBFF;--line:#E3E8F5;--card:#FFFFFF}
@media (prefers-color-scheme: dark){:root{--navy:#E8EEFF;--sub:#A3ACD2;--bg:#0B1030;--soft:#121A45;--line:#26306A;--card:#111A48}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--navy);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;line-height:1.8;font-size:16px}
a{color:var(--pink);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header.site{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.6) blur(12px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--navy);letter-spacing:.04em}
.brand img{width:32px;height:32px;border-radius:9px}
nav a{color:var(--sub);font-size:14px;font-weight:600;margin-left:18px}
.hero{background:linear-gradient(160deg,var(--blue),#39A6FF 60%,#6D7BFF);color:#fff;text-align:center;padding:72px 0 80px}
.hero img{width:120px;height:120px;border-radius:30px;box-shadow:0 18px 40px rgba(15,35,134,.28)}
.hero h1{font-size:40px;margin:22px 0 6px;letter-spacing:.06em}
.hero p.lead{font-size:18px;margin:0 auto;max-width:560px;opacity:.95;font-weight:600}
.badge{display:inline-block;margin-top:28px;padding:12px 26px;border-radius:999px;background:#fff;color:var(--navy);font-weight:800;box-shadow:0 8px 20px rgba(0,0,0,.12)}
section.block{padding:56px 0}
section.block h2{font-size:26px;text-align:center;margin:0 0 28px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.grid.two{grid-template-columns:repeat(2,1fr)}
@media (max-width:640px){.grid.two{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:22px}
.card h3{margin:0 0 6px;font-size:18px}
.card p{margin:0;color:var(--sub);font-size:15px}
.soft{background:var(--soft)}
.doc{padding:40px 0 64px}
.doc h1{font-size:30px;margin:0 0 6px}
.doc .meta{color:var(--sub);font-size:14px;margin-bottom:28px}
.doc h2{font-size:19px;margin:34px 0 8px;padding-top:6px;border-top:1px solid var(--line)}
.doc h3{font-size:16px;margin:16px 0 4px}
.doc p{margin:8px 0}
.doc ul{margin:8px 0;padding-left:1.3em}
.doc li{margin:2px 0}
.toc{background:var(--soft);border-radius:16px;padding:16px 20px;font-size:14px}
.toc ul{list-style:none;margin:0;padding:0;columns:2;column-gap:24px}
.toc li{margin:0 0 6px;break-inside:avoid}
@media (max-width:560px){.toc ul{columns:1}}
.toc a{color:var(--navy)}
.cta{display:inline-block;padding:14px 28px;border-radius:999px;background:var(--pink);color:#fff !important;font-weight:800;text-decoration:none !important}
.idbox{font-size:30px;font-weight:800;letter-spacing:.08em;background:var(--soft);border:2px dashed var(--blue);border-radius:18px;padding:16px 22px;display:inline-block;margin:14px 0;word-break:break-all}
footer.site{border-top:1px solid var(--line);padding:28px 0 40px;color:var(--sub);font-size:13px}
footer.site .links a{color:var(--sub);margin-right:16px}
@media (max-width:560px){.hero h1{font-size:32px}nav a{margin-left:12px;font-size:13px}.doc h1{font-size:25px}}