:root{--bg:#f7f8f5;--card:#fff;--text:#1f2a24;--muted:#5d6b63;--accent:#2f7d5b;--accent-2:#e9f4ee;--border:#dfe5e0;--radius:12px}
@media (prefers-color-scheme:dark){:root{--bg:#141917;--card:#1d2420;--text:#e8ede9;--muted:#a3b0a8;--accent:#6fc79b;--accent-2:#1f3229;--border:#2c3630}}
*{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.75}
a{color:var(--accent)}
.site-header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--card)}
.brand{font-weight:700;text-decoration:none;color:var(--text);font-size:1.1rem;white-space:nowrap}
.site-header nav{display:flex;gap:12px;white-space:nowrap}.site-header nav a{font-size:.85rem;text-decoration:none}
.container{max-width:860px;margin:0 auto;padding:20px 16px 48px}
.hero{padding:16px 0 8px}
h1{font-size:1.6rem;line-height:1.35;margin:.2em 0 .4em}
h2{font-size:1.2rem;margin:1.8em 0 .6em;padding-left:.6em;border-left:4px solid var(--accent)}
h3{font-size:1rem;margin:0 0 .3em}
.lead{color:var(--muted);margin:.2em 0 1em}
.small{font-size:.85rem;color:var(--muted)}
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:8px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:12px}
.card{display:block;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;text-decoration:none;color:var(--text)}
.card p{margin:0;font-size:.88rem;color:var(--muted)}
.card:hover{border-color:var(--accent)}
.calc{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 16px;margin:12px 0 20px}
.calc label{display:block;font-weight:600;margin:12px 0 4px;font-size:.95rem}
.calc input[type=number],.calc input[type=date],.calc input[type=text],.calc select{width:100%;font-size:1.05rem;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text)}
.calc .row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:480px){.calc .row{grid-template-columns:1fr}}
.calc .radio{display:flex;flex-wrap:wrap;gap:8px 16px;font-weight:400}
.calc button{margin-top:16px;width:100%;font-size:1.05rem;font-weight:700;padding:12px;border:0;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}
.result{margin-top:16px;padding:14px 16px;background:var(--accent-2);border-radius:8px;font-size:1rem}
.result .big{font-size:1.6rem;font-weight:700;display:block;margin:2px 0}
.result table{width:100%;border-collapse:collapse;margin-top:8px;font-size:.95rem}
.result td,.result th{padding:6px 4px;border-bottom:1px solid var(--border);text-align:left}
.result th{color:var(--muted);font-weight:600;white-space:nowrap}
.note{font-size:.9rem;color:var(--muted)}
.faq details{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:10px 14px;margin:8px 0}
.faq summary{cursor:pointer;font-weight:600}
.related ul{padding-left:1.2em}
.site-footer{border-top:1px solid var(--border);padding:20px 16px 32px;text-align:center;font-size:.9rem;color:var(--muted)}
.site-footer p{margin:4px 0}
article table.ref{width:100%;border-collapse:collapse;font-size:.92rem;margin:8px 0 16px}
article table.ref th,article table.ref td{border:1px solid var(--border);padding:6px 8px;text-align:left}
article table.ref th{background:var(--accent-2)}
.cta{margin:20px 0}
.btn{display:inline-block;font-weight:700;padding:12px 20px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none}
.btn:hover{opacity:.9}

.aff{margin:24px 0;padding:14px 16px;border:1px dashed #b8c4bb;border-radius:8px;background:#f7faf7}
.aff-label{font-size:.85rem;color:#556;margin:0 0 8px}
.aff ul{margin:0;padding-left:1.2em}
.aff li{margin:4px 0}

.cat-desc{color:var(--muted);font-size:.95rem;margin:0 0 12px;line-height:1.7}
.intro{margin:28px 0 8px}
.intro h2{font-size:1.15rem;margin:18px 0 8px}
.intro p{line-height:1.8;margin:0 0 10px}