:root{
  --bg:#faf8f4; --ink:#1c2230; --muted:#5b6475; --line:#e3ddd1;
  --navy:#16233f; --gold:#b8892f; --card:#ffffff; --soft:#f2ede2;
}
@media (prefers-color-scheme: dark){
  :root{--bg:#12161f; --ink:#eceae4; --muted:#a3abb9; --line:#2b3242; --navy:#0c1220; --gold:#d8a94c; --card:#1a2030; --soft:#171c28;}
}
*{box-sizing:border-box}
html{font-size:100%;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.9;font-size:1rem}
a{color:var(--navy)}
@media (prefers-color-scheme: dark){a{color:#9db7f0}}
a:hover{color:var(--gold)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
header.site{border-bottom:1px solid var(--line);background:var(--bg)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px;padding-top:14px;padding-bottom:14px}
.brand{font-weight:700;text-decoration:none;color:var(--ink);letter-spacing:.02em}
.brand small{display:block;font-weight:400;font-size:.72rem;color:var(--muted);letter-spacing:.04em}
nav.main a{margin-left:16px;font-size:.9rem;text-decoration:none;color:var(--ink)}
nav.main a:hover{color:var(--gold)}
.hero{padding:56px 0 40px}
.eyebrow{font-size:.78rem;letter-spacing:.14em;color:var(--gold);font-weight:700;margin:0 0 12px}
h1{font-size:1.9rem;line-height:1.45;margin:0 0 16px;font-weight:800}
.lead{font-size:1.05rem;color:var(--muted);margin:0 0 24px}
.btn{display:inline-block;background:var(--navy);color:#fff;text-decoration:none;padding:12px 22px;border-radius:6px;font-weight:700;font-size:.95rem}
.btn:hover{background:var(--gold);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);margin-left:8px}
section{padding:36px 0;border-top:1px solid var(--line)}
h2{font-size:1.4rem;line-height:1.5;margin:0 0 14px}
h3{font-size:1.1rem;margin:28px 0 8px}
.flow{list-style:none;margin:20px 0 0;padding:0;display:grid;gap:12px}
.flow li{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:14px 16px}
.flow b{color:var(--gold);margin-right:8px}
.cards{display:grid;gap:14px;margin-top:16px}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px 18px;text-decoration:none;color:var(--ink)}
.card:hover{border-color:var(--gold)}
.card .tag{font-size:.72rem;color:var(--gold);font-weight:700;letter-spacing:.08em}
.card h3{margin:4px 0 6px}
.card p{margin:0;color:var(--muted);font-size:.92rem}
article h1{font-size:1.7rem}
article p{margin:0 0 1.1em}
.meta{color:var(--muted);font-size:.85rem;margin-bottom:24px}
.toc{background:var(--soft);border-radius:8px;padding:14px 20px;margin:20px 0 28px;font-size:.93rem}
.toc ol{margin:6px 0 0;padding-left:1.2em}
.note{background:var(--soft);border-left:4px solid var(--gold);padding:12px 16px;border-radius:4px;margin:20px 0;font-size:.93rem}
table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.93rem}
th,td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
th{background:var(--soft)}
.cta{background:var(--navy);color:#fff;border-radius:10px;padding:26px 22px;margin:36px 0}
.cta h2{color:#fff;margin-top:0}
.cta p{color:#d9deea}
.cta .btn{background:var(--gold)}
footer.site{border-top:1px solid var(--line);margin-top:48px;padding:28px 0;font-size:.85rem;color:var(--muted)}
footer.site a{color:var(--muted)}
footer.site ul{list-style:none;padding:0;margin:0 0 12px;display:flex;flex-wrap:wrap;gap:6px 18px}
@media (max-width:560px){
  h1{font-size:1.55rem}
  .hero{padding:36px 0 28px}
  .btn.ghost{margin:10px 0 0}
  nav.main a{margin-left:0;margin-right:14px}
}