:root{
  --bg:#ffffff;
  --text:#111;
  --muted:#555;
  --line:#e6e6e6;
  --card:#fafafa;
  --accent:#111;
  --max: 980px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP","Yu Gothic",Meiryo,Arial,sans-serif;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
}
a{color:inherit;text-decoration:underline;text-underline-offset:3px}
a:hover{opacity:.85}
header{
  border-bottom:1px solid var(--line);
  background:#fff;
  position:sticky; top:0; z-index:10;
}
.header-inner{
  max-width:var(--max);
  margin:0 auto;
  padding:14px 16px;
  display:flex;
  gap:16px;
  align-items:center;
  justify-content:space-between;
}
.brand{
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
}
nav{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  justify-content:flex-end;
}
nav a{
  text-decoration:none;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:14px;
}
main{
  max-width:var(--max);
  margin:0 auto;
  padding:28px 16px 44px;
}
h1{font-size:28px; line-height:1.3; margin:0 0 14px}
h2{font-size:20px; margin:28px 0 10px}
h3{font-size:16px; margin:18px 0 8px}
p{margin:10px 0}
.lead{font-size:16px; color:var(--muted)}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:14px;
  padding:16px;
  margin:14px 0;
}
.grid{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
}
@media(min-width:860px){
  .grid-2{grid-template-columns:1fr 1fr}
}
.badge{
  display:inline-block;
  padding:3px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:12px;
  color:var(--muted);
}
.cta{
  border:1px solid var(--line);
  border-radius:16px;
  padding:16px;
  background:#fff;
  margin:18px 0;
}
.cta strong{display:block; margin-bottom:6px}
.cta a.button{
  display:inline-block;
  margin-top:10px;
  padding:10px 14px;
  border:1px solid var(--text);
  border-radius:12px;
  text-decoration:none;
  font-weight:700;
}
small{color:var(--muted)}
table{
  width:100%;
  border-collapse:collapse;
  margin:12px 0;
  font-size:14px;
}
th,td{
  border:1px solid var(--line);
  padding:10px;
  vertical-align:top;
}
th{background:#fff; text-align:left}
ul{padding-left:1.2em}
footer{
  border-top:1px solid var(--line);
  background:#fff;
}
.footer-inner{
  max-width:var(--max);
  margin:0 auto;
  padding:18px 16px;
  color:var(--muted);
  font-size:13px;
}
.meta{
  margin-top:18px;
  padding-top:12px;
  border-top:1px dashed var(--line);
  color:var(--muted);
  font-size:13px;
}