:root{--bg:#faf5f0;--fg:#3a2f28;--muted:#7a6c62;--card:#fffdfa;--line:#ece2d8;--accent:#c8714f;--accent-ink:#a9573a;--sage:#8aa58a;--soft:#f4e9df;--res:#fbefe6;--radius:18px}
@media (prefers-color-scheme:dark){:root{--bg:#1d1916;--fg:#f2ebe4;--muted:#b6a99e;--card:#27221e;--line:#3b342e;--accent:#e08f6c;--accent-ink:#f0aa8a;--sage:#a3bda3;--soft:#30281f;--res:#2e241d}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.85 system-ui,-apple-system,"Hiragino Sans","Noto Sans JP",sans-serif;letter-spacing:.02em}
a{color:var(--accent-ink);text-underline-offset:3px}
img{max-width:100%;height:auto}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}
.site-header{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;gap:10px;align-items:center;color:var(--fg);text-decoration:none;font:700 22px/1 "Zen Maru Gothic",sans-serif;letter-spacing:.06em}
.gnav{display:flex;gap:4px}
.gnav a{color:var(--fg);text-decoration:none;font-weight:600;font-size:15px;padding:6px 12px;border-radius:999px}
.gnav a:hover{background:var(--soft)}
.crumb{font-size:13px;color:var(--muted);margin:14px 0}
.crumb a{color:var(--muted)}
h1,h2,h3{font-family:"Zen Maru Gothic",system-ui,sans-serif;font-weight:700;letter-spacing:.03em}
h1{font-size:28px;line-height:1.45;margin:18px 0 10px}
h2{font-size:21px;margin:48px 0 14px;display:flex;align-items:center;gap:10px}
h2::before{content:"";width:6px;height:22px;border-radius:3px;background:var(--accent);flex:none}
h3{font-size:17px;margin:26px 0 8px}
.lead{color:var(--muted)}
.hero{display:grid;grid-template-columns:1.05fr 1fr;align-items:center;gap:8px;margin:12px 0 8px}
.hero h1{font-size:34px;line-height:1.5;margin:0 0 12px}
.hero h1 em{font-style:normal;color:var(--accent-ink)}
.hero img{display:block}
.pill-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.pill-links a{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:14px;font-weight:600;text-decoration:none;color:var(--fg)}
.pill-links a:hover{border-color:var(--accent)}
form.tool{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:22px 0;box-shadow:0 1px 0 var(--line)}
.field{margin-bottom:16px}
.field label,.field .label{display:block;font-weight:600;font-size:14px;margin-bottom:6px}
.field input,.field select{width:100%;font-size:17px;padding:11px 13px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--fg);font-family:inherit}
.field input:focus,.field select:focus{outline:2px solid var(--accent);outline-offset:1px}
.field .unit{display:flex;gap:8px;align-items:center}
.field .unit span{white-space:nowrap;color:var(--muted);font-size:14px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.seg{display:flex;flex-wrap:wrap;gap:8px}
.seg label{font-weight:500;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:999px;padding:7px 14px;cursor:pointer;margin:0;background:var(--bg)}
.seg input{width:auto;accent-color:var(--accent)}
.seg label:has(input:checked){background:var(--soft);border-color:var(--accent)}
button.calc{width:100%;font-size:17px;font-weight:700;padding:13px;border:0;border-radius:12px;background:var(--accent);color:#fff;cursor:pointer;font-family:inherit;letter-spacing:.1em}
button.calc:hover{filter:brightness(1.05)}
.result{margin-top:18px;background:var(--res);border-radius:14px;padding:18px}
.result .big{font:800 34px/1.3 "Zen Maru Gothic",sans-serif;color:var(--accent-ink)}
.result .big small{font-size:16px;font-weight:700;margin-left:2px}
.result p{margin:6px 0}
.hint{color:var(--muted);font-size:14px}
table{width:100%;border-collapse:collapse;font-size:15px;margin:12px 0;background:var(--card)}
th,td{border:1px solid var(--line);padding:9px 10px;text-align:left}
th{background:var(--soft);font-weight:600}
.table-wrap{overflow-x:auto}
.note{background:var(--soft);border-radius:12px;padding:14px 18px;font-size:14px}
.cards{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.cards a{display:block;height:100%;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;text-decoration:none;color:var(--fg);transition:border-color .15s,transform .15s}
.cards a:hover{border-color:var(--accent);transform:translateY(-2px)}
.cards strong{display:block;font-family:"Zen Maru Gothic",sans-serif;font-size:17px;color:var(--fg)}
.cards strong::after{content:" →";color:var(--accent)}
.cards span{font-size:13px;color:var(--muted);line-height:1.65;display:block;margin-top:4px}
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq summary{font-weight:600;cursor:pointer}
.pr{border:1px dashed var(--line);border-radius:14px;padding:12px 16px;margin:28px 0;background:var(--card)}
.pr-label{font-size:11px;color:var(--muted);margin:0}
.updated{font-size:13px;color:var(--muted);margin-top:32px}
.site-footer{margin-top:64px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);padding:28px 0 36px}
.footer-logo{font:700 20px/1 "Zen Maru Gothic",sans-serif;color:var(--fg);margin:0 0 6px}
.site-footer nav{display:flex;flex-wrap:wrap;gap:4px 18px;margin:14px 0}
.site-footer nav a{color:var(--muted)}
.disclaimer{font-size:12px}
@media (max-width:600px){.hero{grid-template-columns:1fr}.hero img{order:-1;max-width:420px;margin:0 auto}.hero h1{font-size:27px}}
@media (max-width:480px){.row{grid-template-columns:1fr}h1{font-size:23px}.logo{font-size:20px}}
@media (prefers-color-scheme:dark){.hero img{border-radius:var(--radius)}}