:root{--p:#0b3a7a;--p2:#1659b5;--sky:#2a9fd8;--acc:#c8102e;--bg:#f2f5f9;--t:#1d2733;--m:#56606b;--line:#c9d4e2;--soft:#e9f0f9}
*{box-sizing:border-box}html{font-size:16px}body{margin:0;font-family:system-ui,"Noto Sans JP","Hiragino Sans","Yu Gothic",sans-serif;background:var(--bg);color:var(--t);line-height:1.7}
.wrap{max-width:1100px;margin:auto;padding:0 16px}a{color:var(--p2)}a:hover{color:var(--acc)}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:6px;z-index:9}
.notice{background:#fff4d6;border-bottom:2px solid #e8b520;font-size:.84rem;padding:7px 0;color:#6b4a00}
.topbar{background:#fff;font-size:.8rem;border-bottom:1px solid var(--line)}.topbar .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px;padding:5px 16px}
.lang a{padding:2px 10px;border:1px solid var(--line);border-radius:2px;text-decoration:none;color:var(--t)}.lang a.on{background:var(--p);border-color:var(--p);color:#fff}
.tools{display:flex;gap:0;align-items:center;flex-wrap:wrap}.tools>*{padding:0 8px;border-left:1px solid var(--line)}.tools>*:first-child{border-left:0}
.tools button{border:1px solid var(--line);background:#f7f9fc;cursor:pointer;padding:0 7px;margin-left:3px;border-radius:2px}.tools button[data-fs="17"]{font-size:1.05em}.tools button[data-fs="19"]{font-size:1.2em}
header.site{background:#fff}header.site>.wrap{padding:16px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--t)}
.brand .mark{width:46px;height:46px;border-radius:4px;background:var(--p);color:#fff;display:grid;place-items:center;font-weight:700;font-size:1.4rem;box-shadow:inset 0 -5px 0 var(--sky)}
.brand strong{display:block;font-size:1.35rem;letter-spacing:.02em}.brand small{color:var(--m);font-size:.8rem}
.hbadge{font-size:.78rem;color:var(--m);border:1px solid var(--line);padding:4px 10px;border-radius:2px;background:#fafbfd}
.menu{background:var(--p);border-bottom:4px solid var(--sky)}.menu ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap}
.menu li{border-right:1px solid rgba(255,255,255,.22)}.menu li:first-child{border-left:1px solid rgba(255,255,255,.22)}
.menu a{display:block;color:#fff;text-decoration:none;padding:12px 18px;font-size:.93rem;font-weight:600}.menu a:hover{background:var(--p2);color:#fff;box-shadow:inset 0 -3px 0 #fff}
.crumb{font-size:.8rem;color:var(--m);padding:9px 0;background:#fff;border-bottom:1px solid var(--line)}.crumb a{color:var(--p2)}
.ptitle{background:linear-gradient(90deg,var(--soft),#fff);border-bottom:1px solid var(--line)}.ptitle .wrap{padding:18px 16px}
.ptitle h1{margin:0;font-size:1.55rem;color:var(--p);border-left:8px solid var(--p);padding:2px 0 2px 14px;line-height:1.35}.ptitle p{margin:8px 0 0 22px;color:var(--m);font-size:.9rem}
main{padding:6px 16px 24px}
.card{background:#fff;padding:22px 24px;margin:16px 0;border:1px solid var(--line);border-radius:2px}
h2{margin:0 0 14px;font-size:1.22rem;color:var(--p);padding:8px 12px;background:var(--soft);border-left:8px solid var(--p);border-bottom:2px solid var(--sky)}
article h2{margin-top:1.8em}article h1{font-size:1.45rem;color:var(--p);border-bottom:3px double var(--p);padding-bottom:8px;margin-top:0}
h3{font-size:1.02rem;color:var(--p);border-left:4px solid var(--sky);padding-left:10px;margin:18px 0 8px}
.num{display:inline-grid;place-items:center;width:1.7em;height:1.7em;background:var(--p);color:#fff;border-radius:50%;font-size:.85em;margin-right:8px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;padding:14px;background:#f8fafd;border:1px solid var(--line);border-radius:2px}
label{font-size:.86rem;color:var(--m);display:block;font-weight:600}input{width:100%;padding:9px;border:1px solid #aebdd0;border-radius:2px;font-size:1rem;margin-top:4px;background:#fff}input:focus{outline:2px solid var(--sky);border-color:var(--sky)}
.res{background:#fff;border:1px solid var(--p2);border-top:5px solid var(--p2);padding:12px 16px;margin-top:14px}.res b{color:var(--p)}
.res:before{content:"計算結果";display:block;font-size:.78rem;font-weight:700;color:var(--p2);letter-spacing:.1em;border-bottom:1px dashed var(--line);margin-bottom:6px;padding-bottom:3px}
table{width:100%;border-collapse:collapse;font-size:.92rem;border:1px solid var(--line)}td,th{padding:7px 9px;border:1px solid var(--line);text-align:left}th{background:var(--soft);color:var(--p)}tr:nth-child(even) td{background:#fafcff}td input{padding:6px;margin:0;min-width:70px}.tw{overflow-x:auto}
.boxes{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px;margin:14px 0}
.box{border:1px solid;border-left-width:6px;border-radius:2px;padding:10px 14px;margin:14px 0;font-size:.9rem}.boxes .box{margin:0}
.box .bt{margin:0 0 4px;font-weight:700;font-size:.85rem;display:inline-block;padding:1px 10px;border-radius:2px;color:#fff}
.box.warn{background:#fffbe6;border-color:#e0b100}.box.warn .bt{background:#b88a00}.box.warn .bt:before{content:"⚠ "}
.box.imp{background:#fff1f1;border-color:#d0283a}.box.imp .bt{background:#c8102e}.box.imp .bt:before{content:"❗ "}
.box.pt{background:#eef5ff;border-color:#2f6fd0}.box.pt .bt{background:#1f5fbf}.box.pt .bt:before{content:"💡 "}
.box.ok{background:#eefaf2;border-color:#2e8b57}.box.ok .bt{background:#237a48}.box.ok .bt:before{content:"✔ "}
.info{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}@media(max-width:760px){.info{grid-template-columns:1fr}}
.info .card{margin:0}.news{list-style:none;padding:0;margin:0}.news li{border-bottom:1px dotted var(--line);padding:7px 0;font-size:.9rem}.news time{display:inline-block;min-width:8.5em;color:var(--p);font-weight:600}
.news .tag{font-size:.72rem;background:var(--acc);color:#fff;padding:0 6px;margin-left:6px;border-radius:2px}
.toc{list-style:none;padding:0;margin:0;columns:2;column-gap:20px}.toc li{padding:5px 0 5px 16px;border-bottom:1px solid #edf1f6;position:relative;break-inside:avoid}.toc li:before{content:"";position:absolute;left:2px;top:13px;border:5px solid transparent;border-left-color:var(--sky)}
.ad{border:2px dashed #c2cddb;color:#8a99ad;text-align:center;padding:18px;margin:16px 0;font-size:.88rem;background:#fff}
.pro{background:#fffaf0;border-top:4px solid var(--acc)}.pro h2{border-left-color:var(--acc);background:#fff1e6;border-bottom-color:#f0a55a}
.btn{background:var(--acc);color:#fff;padding:9px 20px;border-radius:2px;border:0;font-size:1rem;cursor:pointer}.note,.src{color:var(--m);font-size:.84rem}
.cta{display:block;background:var(--p);color:#fff;text-align:center;padding:13px;border-radius:2px;text-decoration:none;margin:22px 0;border-bottom:4px solid var(--sky);font-weight:700}.cta:hover{color:#fff;background:var(--p2)}
ol.src li{margin:3px 0}
.pagetop{text-align:right;font-size:.82rem;margin:4px 0}.pagetop a{text-decoration:none}
footer.site{background:#0a2d5e;color:#d9e4f2;margin-top:24px;font-size:.88rem;border-top:5px solid var(--sky)}footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0;padding:22px 16px}
footer .cols>div{padding:0 16px;border-left:1px solid rgba(255,255,255,.18)}footer .cols>div:first-child{border-left:0}
footer h3{font-size:.95rem;color:#fff;margin:0 0 8px;border:0;padding:0 0 6px;border-bottom:1px solid rgba(255,255,255,.25)}footer ul{list-style:none;padding:0;margin:0}footer li{padding:2px 0}footer a{color:#d9e4f2}footer a:hover{color:#fff}
.fbar{background:#061d3d;font-size:.8rem}.fbar .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding:10px 16px}
@media(max-width:600px){.menu a{padding:9px 10px;font-size:.85rem}.brand strong{font-size:1.1rem}.toc{columns:1}.card{padding:16px}.hbadge{display:none}}
@media print{.notice,.topbar,.menu,.ad,footer{display:none}}