:root{
  --ink:#212129; --sub:#5d5d70; --blue:#2978F5; --base:#EFEEF1; --line:#e2e1e8;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  background:var(--base); color:var(--ink);
  font-family:"Hiragino Maru Gothic ProN","Hiragino Sans","Yu Gothic UI","Yu Gothic",sans-serif;
  -webkit-font-smoothing:antialiased; line-height:2;
}
a{color:var(--blue);text-decoration:none;font-weight:700}
nav{
  position:sticky; top:0; z-index:10; background:#fff; border-bottom:3px solid var(--ink);
  padding:12px 20px; display:flex; align-items:center; justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16px;color:var(--ink)}
.brand img{width:30px;height:30px;border-radius:8px}
nav a.back{font-size:13px;font-weight:800;color:var(--ink);background:#fff;border:2.5px solid var(--ink);border-radius:999px;padding:8px 16px;box-shadow:0 3px 0 var(--ink)}
main{max-width:760px;margin:0 auto;padding:52px 22px 90px}
.doc{
  background:#fff; border:3px solid var(--ink); border-radius:26px;
  box-shadow:0 8px 0 rgba(33,33,41,.85); padding:44px 40px;
}
h1{font-size:clamp(24px,4vw,32px);font-weight:800;line-height:1.5}
.updated{margin-top:6px;font-size:12.5px;color:var(--sub);font-weight:700}
h2{font-size:18px;font-weight:800;margin:36px 0 10px;padding-top:18px;border-top:2px solid var(--line)}
p,li{font-size:14.5px;color:#3a3a48;font-weight:600}
ul,ol{padding-left:1.4em;display:grid;gap:6px;margin-top:8px}
strong{color:var(--ink)}
.note{margin-top:14px;background:#eef3ff;border:2px solid var(--ink);border-radius:14px;padding:14px 18px;font-size:13px;font-weight:700}
footer{text-align:center;font-size:12px;color:var(--sub);font-weight:700;padding:0 0 40px}
@media(max-width:600px){.doc{padding:30px 22px}}