:root {
  --ai: #1b2a4a;
  --ai-deep: #111d36;
  --shu: #d5573b;
  --kin: #c9a86a;
  --gold: #f0c987;
  --kinari: #faf7f0;
  --sumi: #22252a;
  --grey: #6b7280;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  color: var(--sumi);
  background: var(--kinari);
  line-height: 1.9;
}
img { max-width: 100%; display: block; }

.col-header {
  background: var(--ai-deep);
  padding: 14px 0;
}
.col-header .inner { display: flex; align-items: center; justify-content: space-between; }
.col-logo {
  color: #fff; text-decoration: none; font-weight: 700; letter-spacing: .06em;
  display: inline-flex; align-items: center; gap: 10px; font-size: 1.05rem;
}
.col-logo .mark { display: inline-flex; gap: 3px; }
.col-logo .mark i { width: 7px; height: 20px; border-radius: 2px; background: var(--shu); display: block; }
.col-logo .mark i:nth-child(2) { background: #fff; height: 16px; margin-top: 2px; }
.col-logo .mark i:nth-child(3) { background: var(--kin); }
.col-header-cta {
  background: var(--shu); color: #fff; text-decoration: none; font-weight: 700;
  font-size: .85rem; padding: 9px 18px; border-radius: 999px;
}
.inner { max-width: 760px; margin: 0 auto; padding: 0 22px; }

.breadcrumb { font-size: .78rem; color: var(--grey); margin: 18px 0 0; }
.breadcrumb a { color: var(--grey); }

article { padding: 10px 0 40px; }
article h1 { font-size: 1.7rem; line-height: 1.5; color: var(--ai); margin: 18px 0 10px; }
.meta { font-size: .8rem; color: var(--grey); margin-bottom: 26px; }
article h2 {
  font-size: 1.25rem; color: var(--ai); margin: 44px 0 16px; padding: 10px 14px;
  background: #fff; border-left: 5px solid var(--shu); border-radius: 4px;
}
article h3 { font-size: 1.05rem; color: var(--ai); margin: 30px 0 10px; }
article p { margin: 0 0 18px; }
article ul, article ol { margin: 0 0 18px 1.4em; }
article li { margin-bottom: 8px; }
article table {
  width: 100%; border-collapse: collapse; margin: 0 0 22px; background: #fff;
  font-size: .9rem;
}
article th, article td { border: 1px solid #e5e0d5; padding: 10px 12px; text-align: left; }
article thead th { background: var(--ai); color: #fff; font-weight: 700; }
article tbody th { background: #f3efe6; font-weight: 700; width: 28%; }
strong { color: var(--shu); }

.point-box {
  background: #fff; border: 1px solid #e5e0d5; border-radius: 10px;
  padding: 18px 20px; margin: 0 0 22px;
}
.point-box b { color: var(--ai); }

.cta-box {
  background: var(--ai-deep); color: #fff; border-radius: 14px;
  padding: 28px 26px; margin: 40px 0; text-align: center;
}
.cta-box .cta-t { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.cta-box p { color: #cdd4e2; font-size: .9rem; margin-bottom: 16px; }
.cta-box a.btn {
  display: inline-block; background: var(--shu); color: #fff; text-decoration: none;
  font-weight: 700; padding: 13px 30px; border-radius: 999px;
}
.cta-box .cta-note { font-size: .78rem; color: #9aa4b8; margin: 12px 0 0; }

.faq-q { font-weight: 700; color: var(--ai); margin: 20px 0 6px; }
.faq-a { margin: 0 0 14px; }

.related { margin: 40px 0 0; padding-top: 20px; border-top: 1px solid #e5e0d5; }
.related h2 { background: none; border: none; padding: 0; font-size: 1.05rem; }
.related ul { list-style: none; margin: 12px 0 0; }
.related a { color: var(--ai); }

.col-footer {
  background: var(--ai-deep); color: #9aa4b8; font-size: .8rem;
  padding: 26px 0; margin-top: 50px; text-align: center;
}
.col-footer a { color: #cdd4e2; }

/* column index */
.col-list { list-style: none; margin: 26px 0 0; display: grid; gap: 14px; }
.col-list li { background: #fff; border: 1px solid #e5e0d5; border-radius: 10px; }
.col-list a { display: block; padding: 18px 20px; text-decoration: none; color: var(--ai); font-weight: 700; }
.col-list a span { display: block; font-weight: 400; color: var(--grey); font-size: .82rem; margin-top: 6px; }

@media (max-width: 600px) {
  article h1 { font-size: 1.4rem; }
  .col-header-cta { font-size: .78rem; padding: 8px 14px; }
}