a{color:#2f6fe4}
.hd{background:#152033;color:#fff}
.hd-in{max-width:1180px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;justify-content:space-between}
.logo{color:#fff;text-decoration:none;font-weight:800;font-size:20px;display:flex;align-items:center;gap:8px;letter-spacing:.02em}
.logo-i{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:#f08a24;color:#fff;font-size:20px}
.theme{background:transparent;border:1px solid #33445f;color:#cfe0ff;border-radius:8px;width:36px;height:32px;cursor:pointer;font-size:16px}
.gnav{background:#1d2b44;border-top:1px solid #26385a}
.gnav-in{max-width:1180px;margin:0 auto;padding:0 10px;display:flex;gap:2px;overflow-x:auto;scrollbar-width:none}
.gnav-in::-webkit-scrollbar{display:none}
.gnav a{color:#cfdcf3;text-decoration:none;padding:9px 12px;font-size:14px;white-space:nowrap;border-bottom:3px solid transparent}
.gnav a[aria-current]{color:#fff;border-bottom-color:#f08a24;font-weight:700}
.gnav a:hover{color:#fff}
main{display:block}
.crumb{max-width:1180px;margin:8px auto 0;padding:0 16px;font-size:12px;color:var(--sub)}
.crumb a{color:var(--sub)}
.ph{max-width:1180px;margin:0 auto;padding:10px 16px 0}
.ph h1{font-size:22px;margin:4px 0 2px}
.ph .lead{margin:0 0 4px;color:var(--sub);font-size:14px}
.share{max-width:1180px;margin:6px auto 10px;padding:0 16px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.share-l{font-size:12px;color:var(--sub);margin-right:2px}
.sh{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:999px;padding:5px 12px;font-size:13px;text-decoration:none;cursor:pointer;font-family:inherit;line-height:1.3}
.sh.x{background:#111;color:#fff;border-color:#111}.sh.line{background:#06c755;color:#fff;border-color:#06c755}.sh.fb{background:#1877f2;color:#fff;border-color:#1877f2}.sh.th{background:#000;color:#fff;border-color:#000}
.art{max-width:880px;margin:18px auto 0;padding:0 16px;line-height:1.85;font-size:16px}
.art h2{font-size:21px;margin:34px 0 10px;padding:8px 12px;border-left:6px solid #f08a24;background:var(--panel);border-radius:4px}
.art h3{font-size:17px;margin:22px 0 6px;color:#2f6fe4}
.art table{border-collapse:collapse;width:100%;font-size:14px;margin:8px 0 14px;background:var(--panel)}
.art th,.art td{border:1px solid var(--line);padding:7px 9px;text-align:left;vertical-align:top}
.art th{background:var(--key2);white-space:nowrap}
.art .tw{overflow-x:auto}
.art .ex{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0 14px;font-variant-numeric:tabular-nums}
.art .ex b{color:#f08a24}
.art kbd{font-family:ui-monospace,Consolas,monospace;background:var(--key2);border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;padding:0 5px;font-size:13px}
.art .note{font-size:13px;color:var(--sub)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px;margin:10px 0 18px}
.card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 14px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow)}
.card b{display:block;font-size:16px;margin-bottom:2px;color:#2f6fe4}
.card span{font-size:13px;color:var(--sub);line-height:1.5;display:block}
.cdate{margin:2px 0 0;font-size:12px;color:var(--sub)}
.ceye{max-width:880px;margin:8px auto 0;padding:0 16px}.ceye img{width:100%;height:auto;display:block;border-radius:12px;border:1px solid var(--line)}
.ccards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:12px 0 18px}
.ccard{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;text-decoration:none;color:var(--ink);box-shadow:var(--shadow)}
.ccard img{width:100%;height:auto;display:block;aspect-ratio:1200/630;object-fit:cover}
.ccard b{display:block;padding:8px 12px 2px;font-size:15px;line-height:1.5;color:#2f6fe4}.ccard span{display:block;padding:0 12px 10px;font-size:12px;color:var(--sub)}
.crel{margin-top:30px}
.art .toc{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 16px;margin:14px 0}
.art .toc b{display:block;font-size:14px;margin-bottom:4px}.art .toc ol{margin:0;padding-left:1.4em;font-size:14px;line-height:1.9}
.art .answer{background:#fff4e6;border:2px solid #f08a24;border-radius:10px;padding:10px 14px;margin:12px 0}
.art .answer b.h{display:block;color:#c25e00;font-size:14px;margin-bottom:2px}
.art details.q{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:0 14px}
.art details.q summary{cursor:pointer;padding:10px 0;font-weight:700}.art details.q>div{padding:0 0 10px}
.art .ctool{margin:14px 0}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .art .answer{background:#3a2a15}}
:root[data-theme=dark] .art .answer{background:#3a2a15}
.faq{max-width:880px;margin:30px auto 0;padding:0 16px}
.faq h2{font-size:21px;padding:8px 12px;border-left:6px solid #2f6fe4;background:var(--panel);border-radius:4px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:0 14px}
.faq summary{cursor:pointer;padding:12px 0;font-weight:700;list-style:none}
.faq summary::before{content:"Q. ";color:#f08a24}
.faq details>div{padding:0 0 12px;line-height:1.8;font-size:15px}
.upd{max-width:880px;margin:20px auto 0;padding:0 16px;font-size:12px;color:var(--sub)}
.ft{margin-top:40px;background:#152033;color:#cfdcf3;font-size:13px}
.ft-in{max-width:1180px;margin:0 auto;padding:20px 16px}
.ft-nav{display:flex;flex-wrap:wrap;gap:6px 14px;margin-bottom:8px}
.ft-nav a{color:#cfdcf3;text-decoration:none}
.ft-nav.sub a{color:#9fb2d4;font-size:12px}
.cp{color:#7f93b5;font-size:12px;margin:10px 0 0}
.disc{color:#9fb2d4;font-size:12px;margin:8px 0 0;line-height:1.6}.disc a{color:#cfdcf3}
.totop{position:fixed;right:14px;bottom:18px;width:44px;height:44px;border-radius:50%;border:0;background:#2f6fe4;color:#fff;font-size:16px;box-shadow:0 2px 8px rgba(0,0,0,.25);opacity:0;pointer-events:none;transition:.2s;z-index:40;cursor:pointer}
.totop.show{opacity:1;pointer-events:auto}
.tool{max-width:1180px;margin:0 auto;padding:0 16px}
.box{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:var(--shadow)}
.frm{display:flex;flex-wrap:wrap;gap:10px;align-items:flex-end}
.frm label{display:flex;flex-direction:column;font-size:13px;color:var(--sub);gap:4px}
.frm input,.frm select{font-size:18px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--key);color:var(--ink);font-family:inherit;min-width:0}
.btn{border:0;background:#2f6fe4;color:#fff;border-radius:8px;padding:10px 16px;font-size:16px;cursor:pointer;font-family:inherit;touch-action:manipulation}
.btn.sub{background:var(--panel);color:#2f6fe4;border:1.5px solid #2f6fe4;font-weight:700}
.res{font-size:28px;font-weight:700;font-variant-numeric:tabular-nums;margin:10px 0 4px}
.steps{background:var(--key);border-radius:10px;padding:10px 12px;font-variant-numeric:tabular-nums;line-height:1.9;overflow-x:auto}
.scrollhint{display:none;font-size:12px;color:var(--sub);text-align:center}
.scrollhint.show{display:block}
@media (max-width:520px){.hd-in{padding:6px 12px}.logo{font-size:18px}.logo-i{width:26px;height:26px;font-size:17px}.gnav a{padding:7px 10px}.ph{padding-top:6px}.ph h1{font-size:19px}body:has(#calc) .ph h1{font-size:17px;margin:2px 0}body:has(#calc) .ph .lead{display:none}.art{font-size:15px}.art h2{font-size:18px}}
@media (max-height:820px) and (min-width:521px){body:has(#calc) .ph{padding-top:4px}body:has(#calc) .ph h1{font-size:18px;margin:2px 0}}
@media print{.hd,.gnav,.share,.ft,.totop,.faq,.art,.upd,.crumb{display:none}}

/* メニュー（殿 10/14）：トップは電卓の下に独立ボタン・トップ以外は右上の「メニュー」 */
.hd{position:relative}
.hd-r{display:flex;align-items:center;gap:8px}
.hm-btn{display:inline-flex;align-items:center;gap:6px;min-height:44px;min-width:44px;padding:0 12px;border:1px solid #3b5072;border-radius:10px;background:#1d2b44;color:#fff;font-weight:700;font-size:14px;cursor:pointer;touch-action:manipulation}
.hm-bars,.hm-bars::before,.hm-bars::after{display:block;width:18px;height:2px;background:#fff;border-radius:2px;position:relative}
.hm-bars::before,.hm-bars::after{content:"";position:absolute;left:0}
.hm-bars::before{top:-6px}.hm-bars::after{top:6px}
.hm-btn[aria-expanded="true"]{background:#f08a24;border-color:#f08a24}
.hm-nav{position:absolute;right:12px;top:100%;z-index:50;width:min(300px,calc(100vw - 24px));max-height:calc(100vh - 80px);overflow:auto;background:#fff;border:2px solid #152033;border-radius:14px;box-shadow:0 10px 24px rgba(0,0,0,.25);padding:6px}
.hm-nav[hidden]{display:none}
.hm-nav a{display:block;padding:12px 14px;color:#152033;text-decoration:none;font-weight:700;border-radius:10px;font-size:15px}
.hm-nav a:first-child{background:#fff4e6;color:#c25f00}
.hm-nav a:hover,.hm-nav a[aria-current]{background:#e8f0ff}
.tmenu{max-width:900px;margin:18px auto 8px;padding:0 12px}
.tm-h{font-size:17px;margin:0 0 10px;text-align:center}
.tmenu ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.tmc{--c:#1a73e8;display:flex;flex-direction:column;height:100%;border:2px solid var(--c);border-radius:14px;overflow:hidden;background:#fff;text-decoration:none;color:#152033;box-shadow:0 2px 4px rgba(0,0,0,.14);touch-action:manipulation;transition:transform .08s}
.tmc:active{transform:translateY(2px)}
.tmc.c-ao{--c:#1a73e8}.tmc.c-dai{--c:#f08a24}.tmc.c-midori{--c:#12b05a}.tmc.c-aka{--c:#e5484d}
.tmp{display:grid;place-items:center;height:56px;background:var(--c);color:#fff;font-size:30px;font-weight:800;line-height:1}
.tmt{display:flex;align-items:center;justify-content:center;flex:1;min-height:44px;padding:4px;font-weight:800;font-size:14px;text-align:center;line-height:1.3;word-break:keep-all;overflow-wrap:anywhere}
.tmenu li:last-child:nth-child(3n+1){grid-column:2}
@media (min-width:760px){.tmenu ul{grid-template-columns:repeat(6,minmax(0,1fr))}.tmenu li:last-child:nth-child(3n+1){grid-column:auto}.tmenu li:last-child:nth-child(6n+1){grid-column:3/5;justify-self:center;width:calc(50% - 5px)}}
@media (max-width:520px){.hm-btn{font-size:13px;padding:0 10px}.tmt{font-size:13px}}
@media print{.hm-btn,.hm-nav,.tmenu{display:none}}