:root{--b:#1b55a3;--bd:#123f7d;--bl:#eaf1fa;--bg:#f4f6f9;--ln:#d3dbe7;--tx:#1f2933;--mu:#5f6b7a;--ac:#e8761a;--acd:#bd5a0b}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--tx);font:16px/1.9 "Hiragino Sans","BIZ UDPGothic","Yu Gothic UI","Meiryo","Noto Sans JP",sans-serif;letter-spacing:.02em}
header{background:var(--b);border-bottom:4px solid var(--bd)}
.in{max-width:880px;margin:0 auto;padding:0 18px}
header .in{display:flex;justify-content:space-between;align-items:center;min-height:56px;gap:12px}
.logo{font-weight:700;font-size:1.2rem;color:#fff;text-decoration:none;letter-spacing:.06em}
.lang button{font:inherit;font-size:.82rem;background:#fff;color:var(--b);border:1px solid #fff;padding:2px 12px;cursor:pointer}
.lang button:first-child{border-radius:4px 0 0 4px}.lang button:last-child{border-radius:0 4px 4px 0}
.lang button[aria-pressed=true]{background:var(--bd);color:#fff}
.bc{font-size:.8rem;color:var(--mu);padding:12px 0 4px}.bc a{color:var(--b)}
h1{font-size:1.55rem;line-height:1.5;margin:8px 0 14px;color:var(--bd);letter-spacing:.03em}
h2{font-size:1.12rem;margin:40px 0 14px;padding:8px 14px;background:var(--bl);border-left:6px solid var(--b);border-radius:0 4px 4px 0;color:var(--bd)}
.box{background:#fff;border:1px solid var(--ln);border-radius:4px;padding:8px 22px 20px}
.box h2{margin-top:24px}.box p{margin:10px 0}
table{width:100%;border-collapse:collapse;background:#fff;font-variant-numeric:tabular-nums}
th,td{border:1px solid var(--ln);padding:10px 14px;text-align:left;vertical-align:top}
th{background:var(--bl);font-weight:600}
.info th{width:30%}
.ph{background:#fff3cd;padding:0 3px}
.date{color:var(--mu);font-size:.85rem;text-align:right}
html[lang=ja] [lang=en],html[lang=en] [lang=ja]{display:none}
footer{margin-top:56px;background:var(--bd);color:#d6e4f8;font-size:.82rem;text-align:center;padding:22px 12px;line-height:2}
footer a{color:#d6e4f8;margin:0 10px}
:focus-visible{outline:3px solid var(--ac);outline-offset:2px}
@media(max-width:600px){.info th,.info td{display:block;width:100%}.info th{border-bottom:0}h1{font-size:1.3rem}.box{padding:6px 16px 16px}}

/* header / nav / footer */
header.hd{position:sticky;top:0;z-index:50}
.hdin{display:flex;align-items:center;gap:14px}
.gnav{display:flex;gap:2px;margin-left:auto}
.gnav a{color:#fff;text-decoration:none;font-size:.9rem;padding:6px 12px;border-radius:4px;white-space:nowrap}
.gnav a:hover{background:rgba(255,255,255,.16)}
.hd .lang{flex:none}
.burger{display:none;flex:none;width:42px;height:42px;padding:0;background:none;border:1px solid rgba(255,255,255,.55);border-radius:4px;cursor:pointer;position:relative}
.burger span{position:absolute;left:10px;right:10px;height:2px;background:#fff;transition:transform .2s,opacity .2s}
.burger span:nth-child(1){top:13px}.burger span:nth-child(2){top:20px}.burger span:nth-child(3){top:27px}
.burger[aria-expanded=true] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded=true] span:nth-child(2){opacity:0}
.burger[aria-expanded=true] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.burger span{transition:none}}
h2[id],#calc{scroll-margin-top:76px}
.ft{margin-top:64px;background:var(--bd);color:#d6e4f8;font-size:.88rem;text-align:left;padding:0;line-height:1.8}
.fcols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:28px;padding:34px 0 24px}
.fn{margin:0 0 6px;font-weight:700;font-size:1.05rem;color:#fff}
.fd{margin:0;color:#b9cdea;font-size:.84rem}
.fh{margin:0 0 8px;font-weight:700;color:#fff;border-bottom:1px solid rgba(255,255,255,.25);padding-bottom:4px}
.fcols ul{list-style:none;margin:0;padding:0}.fcols li{margin:2px 0}
.ft a{color:#d6e4f8;margin:0;text-decoration:none}.ft a:hover{text-decoration:underline}
.fb{border-top:1px solid rgba(255,255,255,.2);padding:14px 0 18px;font-size:.78rem;color:#b9cdea;text-align:center}
.top{position:fixed;right:16px;bottom:16px;width:44px;height:44px;border-radius:50%;border:0;background:var(--b);color:#fff;box-shadow:0 2px 6px rgba(0,0,0,.3);cursor:pointer;opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s}
.top.on{opacity:1;visibility:visible}
.top span{display:block;width:12px;height:12px;margin:17px auto 0;border-left:3px solid #fff;border-top:3px solid #fff;transform:rotate(45deg)}
@media(max-width:760px){
 .burger{display:block;margin-left:0}
 .hd .lang{margin-left:auto}
 .gnav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:var(--bd);border-top:1px solid rgba(255,255,255,.2);box-shadow:0 6px 10px rgba(0,0,0,.2)}
 .gnav.open{display:flex}
 .gnav a{padding:14px 20px;border-radius:0;border-bottom:1px solid rgba(255,255,255,.14);font-size:1rem}
 .fcols{grid-template-columns:1fr 1fr}.fcols>div:first-child{grid-column:1/-1}
}

/* 折り返し：短い文言は文節の途中で切らない */
body{word-break:auto-phrase;overflow-wrap:break-word}
h1,h2,h3,th,label,summary,.chip,button,.lg,.fn,.fh,.gnav a{word-break:keep-all;overflow-wrap:break-word}
h1,h2,h3{text-wrap:balance}
/* tool cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;padding:0;margin:0;list-style:none}
.cards a{display:block;height:100%;background:#fff;border:1px solid var(--ln);border-radius:4px;padding:14px 16px;text-decoration:none;color:var(--tx)}
.cards a:hover{border-color:var(--b);background:var(--bl)}
.cards b{display:block;color:var(--bd);margin-bottom:4px}
.cards .d{display:block;font-size:.85rem;color:var(--mu);line-height:1.6}
/* header fit on narrow screens */
.logo{white-space:nowrap}
@media(max-width:760px){.logo{font-size:1.02rem;letter-spacing:.02em}.hdin{gap:8px}}
@media(max-width:340px){.logo{font-size:.9rem;letter-spacing:0}.lang button{font-size:.74rem;padding:2px 7px}.burger{width:38px}}
@media(max-width:340px){header .in{padding:0 10px}.logo{font-size:.85rem}}
.ft a,.ft li,.info th,.info td{word-break:normal;overflow-wrap:anywhere}
.fcols{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr) minmax(0,1fr)}
@media(max-width:760px){.fcols{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}

/* Shared accessibility text-size controls (settings persist across calculators and file tools). */
.font-ctrl{display:flex;align-items:center;gap:2px;flex:none}
.font-ctrl button{min-width:26px;min-height:30px;padding:2px 5px;border:1px solid rgba(255,255,255,.7);border-radius:3px;background:#fff;color:var(--b);font:700 .78rem/1.2 inherit;cursor:pointer}
.font-ctrl button.active{background:var(--bd);border-color:var(--bd);color:#fff}
.font-ctrl button:focus-visible{outline:3px solid var(--ac);outline-offset:2px}
html[data-font-scale="small"] body{zoom:.94}
html[data-font-scale="large"] body{zoom:1.16}
@media(max-width:760px){.font-ctrl{gap:1px}.font-ctrl button{min-width:23px;padding:2px 3px;font-size:.72rem}.hdin{gap:6px}}
@media(max-width:340px){.font-ctrl button{min-width:20px;font-size:.65rem}.lang button{padding:2px 5px}.logo{font-size:.78rem!important}}
/* Correct button font declaration for the shared text-size controls. */
.font-ctrl button{font-family:inherit;font-size:.78rem;font-weight:700;line-height:1.2}

/* ===== Cross-site switch + mobile header (shared look with FilePat) ===== */
.gnav a.xsite{border:1px solid rgba(255,255,255,.7);border-radius:999px;padding:5px 14px;margin-left:6px}
.gnav a.xsite::after{content:" \2197";font-size:.85em}
@media(min-width:761px){header.hd .hdin{min-height:64px}}
@media(max-width:760px){
  .hdin{flex-wrap:wrap;row-gap:8px;padding-top:8px;padding-bottom:8px}
  .logo{flex:1 1 auto;order:1}
  .burger{order:2;margin-left:auto}
  .hd .lang{order:3;margin-left:0}
  .font-ctrl{order:4;margin-left:auto}
  .gnav a.xsite{margin:10px 20px;border-radius:6px;text-align:center}
}
header.hd + .in{padding-top:20px}
.gnav a[aria-current=page]{background:rgba(255,255,255,.2)}
.fsoc{margin:8px 0 0;font-size:.85rem}.fsoc a{margin-right:12px}
@media(max-width:760px){.gnav a[aria-current=page]{background:rgba(255,255,255,.12)}}
@media(min-width:761px){.fcols{grid-template-columns:1.3fr 1fr 1fr 1fr}}
/* header & footer span the full width */
header.hd .in,footer.ft .in{max-width:none;padding-left:28px;padding-right:28px}
@media(max-width:760px){header.hd .in,footer.ft .in{padding-left:16px;padding-right:16px}}

/* Header inner row is centered; blue background still spans the viewport. */
header.hd .hdin,footer.ft .in{width:min(1160px,calc(100% - 40px));max-width:1160px;margin-left:auto;margin-right:auto;padding-left:0;padding-right:0}
.gnav a.xsite{display:inline-flex;align-items:center;gap:7px}
.gnav a.xsite::after{content:none!important;display:none!important}
.filepat-nav-logo{display:block;width:76px;height:auto;flex:0 0 auto;object-fit:contain}
@media(max-width:760px){header.hd .hdin,footer.ft .in{width:calc(100% - 24px);padding-left:0;padding-right:0}.gnav a.xsite .filepat-nav-logo{width:76px}}


/* FilePat brand mark in the shared calculator header. */
.gnav a.xsite{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:5px 12px!important;min-height:38px;line-height:1.2}
.gnav a.xsite .filepat-nav-logo{display:block;width:88px;height:27px;box-sizing:border-box;padding:3px 5px;object-fit:contain;background:#fff;border-radius:5px;flex:0 0 auto}
.gnav a.xsite:hover .filepat-nav-logo{background:#f5f8fc}
@media(max-width:760px){.gnav a.xsite{margin:10px 16px!important;justify-content:center}.gnav a.xsite .filepat-nav-logo{width:92px;height:29px}}

/* Group labels for the expanded File tools section on the calculator home page. */
.file-tools-category{margin:22px 0 10px;color:var(--bd);font-size:1rem;font-weight:700;line-height:1.4}
.file-tools-category:first-of-type{margin-top:18px}
/* Main calculator hub: a concise H1 for visitors and search engines. */
.home-seo-title{font-size:1.42rem;line-height:1.45;margin:18px 0 10px;color:var(--bd);letter-spacing:.01em}
.home-seo-title + h2{margin-top:14px}
@media(max-width:600px){.home-seo-title{font-size:1.25rem;margin-top:14px}}