:root{
  --ink:#232733; --muted:#5b6172; --accent:#3b5bdb; --accent-soft:#e7ecfd;
  --bg:#fafaf7; --card:#ffffff; --line:#e3e1d8; --warn:#b8860b;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.85;font-size:16px}
a{color:var(--accent)}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header.site{background:#1f2432;color:#f2f1ea}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:8px 22px;padding-top:16px;padding-bottom:16px}
.logo{font-size:20px;font-weight:700;color:#fff;text-decoration:none;letter-spacing:.02em}
.logo small{display:block;font-size:12px;font-weight:400;color:#b9c0d4;letter-spacing:.08em}
nav.main{display:flex;flex-wrap:wrap;gap:4px 18px;margin-left:auto}
nav.main a{color:#dfe3ee;text-decoration:none;font-size:14px}
nav.main a:hover{color:#fff;text-decoration:underline}
.hero{padding:52px 0 8px}
.hero h1{font-size:30px;line-height:1.5;margin:0 0 14px}
.hero p.lead{font-size:17px;color:var(--muted);margin:0}
h2{font-size:22px;margin:44px 0 14px;padding-bottom:6px;border-bottom:2px solid var(--accent-soft)}
h3{font-size:18px;margin:26px 0 8px}
p{margin:10px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:20px 22px;margin:16px 0}
.card h3{margin-top:0}
ul{margin:8px 0 8px 1.2em;padding:0}
li{margin:4px 0}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;
  padding:10px 22px;border-radius:8px;font-weight:700;margin-top:8px}
.btn.disabled{background:#aab0c0;pointer-events:none}
.ad-slot{border:1px dashed #b9bdc9;border-radius:8px;padding:12px 16px;margin:18px 0;
  background:#f4f4ef;font-size:14px;color:var(--muted)}
.ad-slot .ad-label{display:inline-block;background:#6b7280;color:#fff;font-size:11px;
  border-radius:4px;padding:1px 7px;margin-right:8px;vertical-align:2px}
.ad-placeholder{text-align:center;color:#9aa0ae}
.slot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.slot-card{border:1px dashed #c4c8d2;border-radius:10px;padding:18px;background:#fff;color:#9aa0ae}
.slot-card .st{font-weight:700;color:#7c8194}
.price{font-size:26px;font-weight:700}
.price small{font-size:14px;color:var(--muted);font-weight:400}
.note{font-size:13px;color:var(--muted)}
footer.site{margin-top:64px;background:#1f2432;color:#c9cede;font-size:13px}
footer.site .wrap{padding-top:24px;padding-bottom:28px}
footer.site a{color:#dfe3ee}
.placeholder-box{border:2px dashed var(--warn);background:#fffaf0;border-radius:10px;
  padding:16px 20px;margin:16px 0;color:#7a5b12}