*{box-sizing:border-box}
body{font:17px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;max-width:840px;margin:0 auto;padding:0 18px 40px;color:#20293a;background:#fff}
header.site{display:flex;align-items:center;justify-content:space-between;padding:18px 0;border-bottom:2px solid #1F4E79;margin-bottom:8px;flex-wrap:wrap;gap:10px}
header.site a.logo{font-weight:800;font-size:1.25em;color:#1F4E79;text-decoration:none}
nav.site a{color:#1F4E79;text-decoration:none;margin-left:18px;font-weight:600;font-size:.95em}
nav.site a:hover{text-decoration:underline}
h1{font-size:1.9em;color:#132a44;margin-top:.6em}
h2{font-size:1.35em;color:#1F4E79;margin-top:1.8em}
h3{font-size:1.1em;color:#1F4E79}
p{margin:0.9em 0}
a{color:#0a58ca}
table{border-collapse:collapse;width:100%;margin:1.2em 0;font-size:.96em}
table th,table td{border:1px solid #d6dfe9;padding:8px 10px;text-align:left}
table th{background:#DCE6F1}
.badge{display:inline-block;background:#DCE6F1;color:#132a44;border-radius:20px;padding:3px 12px;font-size:.85em;font-weight:600}
.card{background:#F7F9FC;border:1px solid #e1e8f0;border-radius:12px;padding:22px 24px;margin:20px 0}
.price{font-size:2em;font-weight:800;color:#1F4E79}
.btn{display:inline-block;background:#1F4E79;color:#fff !important;text-decoration:none;padding:15px 28px;border-radius:8px;font-weight:700;font-size:1.05em;margin:10px 0}
.btn:hover{background:#163a5c}
.notice{background:#FFF2CC;border-radius:8px;padding:12px 16px;font-size:.92em}
.b2b{font-size:.9em;color:#555;font-style:italic}
ul.check li{margin:.4em 0}
footer.site{margin-top:56px;padding-top:18px;border-top:1px solid #e1e8f0;font-size:.85em;color:#667}
footer.site a{color:#667}
.calc-grid{display:grid;grid-template-columns:1fr 140px;gap:10px 16px;align-items:center;max-width:520px}
.calc-grid label{font-size:.95em}
.calc-grid input{padding:8px;border:1px solid #c7d2e0;border-radius:6px;font-size:1em;width:100%}
.result-box{background:#DCE6F1;border-radius:10px;padding:20px;margin-top:20px;font-size:1.15em}
.result-box strong{color:#1F4E79;font-size:1.4em}
.ai-note{font-size:.85em;color:#666}