html,body{margin:0;background:#fff}

.fqC{
  --acc:#635bff; --ink:#0a2540; --body:#374151; --sub:#4b5563; --line:#e6e9ee;
  font-family:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  background:#fff;padding:clamp(52px,6.5vw,96px) 24px;
}
.fqC__in{max-width:1020px;margin:0 auto;display:grid;grid-template-columns:250px 1fr;gap:clamp(30px,5vw,64px)}
.fqC__nav h2{margin:0 0 22px;font-size:19px;font-weight:800;color:var(--ink)}
.fqC__nav ul{margin:0;padding:0;list-style:none;display:grid;gap:2px}
.fqC__nav a{
  display:block;padding:11px 14px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--body);
  text-decoration:none;transition:.12s;
}
.fqC__nav a:hover{background:#f6f9fc;color:var(--ink)}
.fqC__nav a.is-on{background:rgba(99,91,255,.09);color:var(--acc);font-weight:800}
.fqC__help{margin-top:26px;padding:18px;background:#f6f9fc;border-radius:10px}
.fqC__help p{margin:0;font-size:12.5px;font-weight:700;color:var(--ink)}
.fqC__help a{display:inline-block;margin-top:8px;font-size:12.5px;font-weight:700;color:var(--acc);text-decoration:none}
.fqC__cat{margin:0 0 6px;font-size:11.5px;font-weight:800;letter-spacing:.08em;color:var(--sub)}
.fqC__items details{border-bottom:1px solid var(--line)}
.fqC__items summary{
  list-style:none;cursor:pointer;padding:20px 36px 20px 0;font-size:14.5px;font-weight:700;color:var(--ink);
  position:relative;line-height:1.7;
}
.fqC__items summary::-webkit-details-marker{display:none}
.fqC__items summary::after{
  content:"＋";position:absolute;right:4px;top:19px;font-size:15px;color:var(--acc);transition:transform .2s;
}
.fqC__items details[open] summary::after{content:"−"}
.fqC__items p{margin:0;padding:0 0 22px;font-size:13.5px;line-height:2;color:var(--body)}
@media (max-width:760px){ .fqC__in{grid-template-columns:1fr} }