:root{--main:#1f4e8c;--dark:#173a69;--accent:#f2a900;--bg:#f4f7fb;--text:#1f2933;--sub:#5b6773;--line:#d9e1ec;--card:#fff}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.85;color:var(--text);background:var(--bg)}
.wrap{max-width:860px;margin:0 auto;padding:0 18px}
a{color:var(--main)}
.site-header{background:var(--dark);border-bottom:4px solid var(--accent)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 18px;padding-top:10px;padding-bottom:10px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.2rem;color:#fff;text-decoration:none}
.logo-mark{display:inline-flex;width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--dark);align-items:center;justify-content:center;font-weight:800}
.site-header nav a{color:#dbe6f5;text-decoration:none;margin-left:16px;font-size:.92rem}
.site-header nav a:hover{color:#fff;text-decoration:underline}
main.wrap{padding-top:26px;padding-bottom:50px}
h1{font-size:1.65rem;line-height:1.4;margin:.3em 0 .6em;color:var(--dark)}
h2{font-size:1.3rem;margin:2.2em 0 .7em;padding:.1em 0 .1em .7em;border-left:6px solid var(--accent);color:var(--dark)}
h3{font-size:1.08rem;margin:1.6em 0 .5em;color:var(--main)}
.hero{background:linear-gradient(135deg,var(--dark),var(--main));color:#fff;border-radius:12px;padding:30px 24px;margin-bottom:26px}
.hero h1{color:#fff;margin:0 0 .2em}
.hero-tag{margin:0 0 .6em;font-weight:700;color:#ffd666}
.hero .lead{margin:0 0 .8em;color:#e8f0fb}
.hero-points{margin:0;padding-left:1.2em;color:#fff;font-size:.94rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;transition:box-shadow .15s}
.card:hover{box-shadow:0 4px 14px rgba(31,78,140,.15)}
.card a{display:block;padding:16px;text-decoration:none;color:inherit;height:100%}
.card h3{margin:.4em 0;font-size:1.02rem;color:var(--dark)}
.card p{margin:0 0 .6em;font-size:.88rem;color:var(--sub);line-height:1.6}
.card time{font-size:.8rem;color:var(--sub)}
.cat{display:inline-block;background:#e4edf8;color:var(--main);border-radius:4px;padding:1px 9px;font-size:.78rem;text-decoration:none}
.cat-nav{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px}
.cat-nav a{background:#fff;border:1px solid var(--line);border-radius:20px;padding:4px 14px;text-decoration:none;font-size:.9rem}
.cat-nav a span{color:var(--sub);margin-left:4px;font-size:.8rem}
.cat-nav a.current{background:var(--main);color:#fff;border-color:var(--main)}
.cat-nav a.current span{color:#cfe0f5}
.post{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px 26px}
.breadcrumb{font-size:.82rem;color:var(--sub);margin-bottom:6px}
.breadcrumb a{color:var(--sub)}
.meta{font-size:.82rem;color:var(--sub);display:flex;flex-wrap:wrap;gap:4px 14px;align-items:center;margin:0 0 16px}
.summary{background:#fff8e1;border:2px solid var(--accent);border-radius:10px;padding:12px 18px;margin:0 0 18px}
.summary p{margin:0}
.summary-label{display:inline-block;background:var(--accent);color:var(--dark);font-weight:800;font-size:.78rem;border-radius:4px;padding:0 10px;margin-bottom:6px!important}
.toc{background:#eef3fa;border-radius:8px;padding:12px 18px;margin:20px 0}
.toc p{margin:0 0 4px;font-weight:700}
.toc ol{margin:0;padding-left:1.4em;font-size:.94rem}
.table-wrap{overflow-x:auto;margin:1em 0}
table{border-collapse:collapse;width:100%;min-width:520px;font-size:.9rem;background:#fff}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:#e4edf8;color:var(--dark);white-space:nowrap}
.note{background:#eef6ff;border-left:5px solid var(--main);padding:10px 16px;border-radius:4px;margin:1em 0;font-size:.94rem}
.disclaimer{background:#f3f4f6;border-radius:8px;padding:12px 16px;font-size:.84rem;color:var(--sub);margin-top:26px}
.related{margin-top:34px}
.more{text-align:right}
.lead{color:var(--sub)}
.article-pager{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.article-pager a{flex:1 1 240px;display:flex;flex-direction:column;gap:2px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;text-decoration:none;color:inherit}
.article-pager a:hover{box-shadow:0 4px 14px rgba(31,78,140,.15)}
.article-pager .label{font-size:.78rem;color:var(--sub)}
.article-pager .ttl{font-weight:700;color:var(--dark);line-height:1.45}
.article-pager .pager-next{margin-left:auto;text-align:right}
@media(max-width:600px){.article-pager .pager-next{text-align:left}}
code{background:#eef1f5;padding:1px 5px;border-radius:3px;font-size:.9em}
.site-footer{background:var(--dark);color:#c9d6e8;font-size:.86rem;padding:20px 0}
.site-footer a{color:#e4edf8;margin-right:16px;text-decoration:none}
.site-footer p{margin:10px 0 0}
@media(max-width:600px){h1{font-size:1.38rem}.post{padding:18px 15px}.site-header nav a{margin:0 12px 0 0}}

.calc{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:14px 16px 6px;margin:1em 0}
.calc h3{margin:.2em 0 .4em}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px 16px;margin:8px 0 4px}
.calc label{display:block;font-size:.86rem;color:var(--sub);margin-bottom:2px}
.calc input,.calc select{width:100%;font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:6px;background:#fff}
.calc-check{font-size:.9rem;margin:.6em 0}
.calc-actions{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 12px}
.calc button{font:inherit;background:var(--main);color:#fff;border:0;border-radius:6px;padding:8px 14px;cursor:pointer}
.calc button.ghost{background:#e4edf8;color:var(--dark)}
.calc .err{color:#9b2c2c;font-size:.9rem}
@media(max-width:600px){.calc-grid{grid-template-columns:1fr}}

.share{margin:1.5em 0;text-align:center}
.share-x{display:inline-block;padding:.6em 1.4em;background:#000;color:#fff!important;border-radius:999px;text-decoration:none;font-weight:bold;max-width:100%;box-sizing:border-box}
.share-x:hover{opacity:.85}