:root{
  --bg:#f7f4ee;--bg-soft:#fbfaf7;--panel:#fffefa;--ink:#191915;--text:#302e29;--muted:#777369;
  --line:#dfd8cc;--line-strong:#cdc3b3;--gold:#af8e58;--gold-dark:#80633a;--gold-soft:#efe6d8;
  --black:#151512;--good:#56705b;--warn:#916c32;--danger:#9a514b;
  --serif:"Zen Old Mincho","Noto Serif JP","Yu Mincho",serif;
  --sans:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  --number:"Inter","Noto Sans JP",sans-serif;
  --shadow-sm:0 8px 24px rgba(45,37,24,.055);--shadow:0 18px 55px rgba(45,37,24,.09);
}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;color:var(--text);background:radial-gradient(circle at 8% 2%,rgba(197,171,128,.13),transparent 28rem),linear-gradient(180deg,#fffefd 0%,var(--bg) 76%,#f2eee6 100%);font-family:var(--sans);line-height:1.9;letter-spacing:.015em;-webkit-font-smoothing:antialiased}a{color:inherit}button{font:inherit}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.site-header{position:sticky;top:0;z-index:100;border-bottom:1px solid rgba(223,216,204,.72);background:rgba(255,254,251,.9);backdrop-filter:blur(18px)}.header-inner{min-height:78px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none}.brand-mark{width:42px;height:42px;border:1px solid var(--gold);border-radius:50%;display:grid;place-items:center;color:var(--gold-dark);font:500 19px/1 var(--serif)}.brand-copy strong{display:block;font-family:var(--serif);font-weight:500;font-size:18px;letter-spacing:.08em}.brand-copy small{display:block;color:var(--muted);font:500 10px/1.3 var(--number);letter-spacing:.12em;margin-top:3px}.site-nav{display:flex;align-items:center;gap:24px;margin-left:auto}.site-nav a{text-decoration:none;font-size:13px;font-weight:600;white-space:nowrap;color:#514d45}.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--gold-dark)}.header-cta{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--black);border-radius:999px;background:var(--black);color:#fff!important;padding:11px 22px;text-decoration:none!important;box-shadow:0 10px 25px rgba(21,21,18,.13);transition:.2s ease}.header-cta:hover{transform:translateY(-2px);box-shadow:0 15px 32px rgba(21,21,18,.18)}.menu-button{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);border-radius:50%;background:var(--panel);cursor:pointer}.breadcrumb{display:flex;flex-wrap:wrap;gap:7px;margin:0;padding:22px 0 0;color:var(--muted);font-size:11px}.breadcrumb a{text-decoration:none}.breadcrumb span::before{content:"/";margin-right:7px;color:#aaa397}.listing-hero,.article-hero{padding:62px 0 48px}.eyebrow{display:inline-flex;padding:7px 12px;border:1px solid var(--line-strong);border-radius:8px;color:#6c604f;background:rgba(255,254,250,.72);font-size:12px;font-weight:600}.listing-hero h1,.article-hero h1{margin:20px 0 16px;color:var(--ink);font-family:var(--serif);font-weight:500;line-height:1.42;letter-spacing:.035em}.listing-hero h1{font-size:clamp(38px,5.3vw,64px)}.article-hero h1{max-width:930px;font-size:clamp(34px,4.6vw,58px)}.hero-lead{max-width:780px;margin:0;color:#625e56;font-size:15px;line-height:2}.article-meta{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:22px;color:var(--muted);font-size:11px}.article-meta span{display:inline-flex;align-items:center;gap:7px}.article-meta span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--gold)}.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;padding:10px 0 84px}.article-card{display:flex;flex-direction:column;min-height:330px;padding:28px;border:1px solid var(--line);border-radius:18px;background:rgba(255,254,250,.88);box-shadow:var(--shadow-sm);text-decoration:none;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cdbb99}.article-card .category{color:var(--gold-dark);font:600 11px var(--number);letter-spacing:.1em;text-transform:uppercase}.article-card h2{margin:16px 0 12px;color:var(--ink);font-family:var(--serif);font-weight:500;font-size:25px;line-height:1.55}.article-card p{margin:0;color:var(--muted);font-size:13px}.article-card .card-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:auto;padding-top:28px;color:#625e55;font-size:11px}.article-card .arrow{font-size:19px;transition:transform .2s ease}.article-card:hover .arrow{transform:translateX(5px)}.listing-cta{margin:0 0 86px;padding:35px;border:1px solid var(--line);border-radius:22px;background:#151512;color:#fff;display:grid;grid-template-columns:1fr auto;align-items:center;gap:28px}.listing-cta h2{margin:0 0 7px;font-family:var(--serif);font-weight:500;font-size:27px}.listing-cta p{margin:0;color:rgba(255,255,255,.68);font-size:12px}.cta-button{display:inline-flex;align-items:center;justify-content:center;gap:22px;border-radius:12px;background:#fff;color:#151512;padding:14px 22px;text-decoration:none;font-weight:700;white-space:nowrap}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(240px,300px);gap:50px;align-items:start;padding:0 0 90px}.article-body{min-width:0;padding:42px 46px;border:1px solid var(--line);border-radius:22px;background:rgba(255,254,250,.94);box-shadow:var(--shadow-sm)}.article-body h2{margin:54px 0 18px;padding-top:4px;color:var(--ink);font-family:var(--serif);font-size:29px;font-weight:500;line-height:1.55}.article-body h2:first-child{margin-top:0}.article-body h3{margin:32px 0 12px;color:var(--ink);font-family:var(--serif);font-size:20px;font-weight:500}.article-body p{margin:0 0 20px;font-size:14px}.article-body ul,.article-body ol{margin:0 0 24px;padding-left:1.45em}.article-body li{margin:7px 0;font-size:14px}.article-body strong{color:#27231d}.summary-box,.formula-box,.example-box,.note-box{margin:26px 0;padding:22px 24px;border-radius:14px}.summary-box{border:1px solid #d9c9ab;background:#fbf7ee}.summary-box h2,.summary-box h3{margin:0 0 10px;font-size:19px}.formula-box{border-left:4px solid var(--gold);background:#f5f0e7}.formula{display:block;margin:10px 0;color:var(--ink);font:600 clamp(18px,2.2vw,24px)/1.6 var(--number);letter-spacing:0;overflow-wrap:anywhere}.formula-caption{color:var(--muted);font-size:11px}.example-box{border:1px solid var(--line);background:#fff}.example-box .example-title{display:inline-flex;margin-bottom:13px;padding:5px 9px;border-radius:6px;background:var(--black);color:#fff;font-size:10px;font-weight:600}.note-box{border:1px solid #e1d4bc;background:#fffaf0}.note-box strong{display:block;margin-bottom:5px}.data-table{width:100%;margin:24px 0 30px;border-collapse:collapse;font-size:13px}.data-table th,.data-table td{padding:13px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.data-table th{background:#f7f3eb;color:#625c52;font-weight:600}.data-table tr:first-child th:first-child{border-radius:9px 0 0 0}.data-table tr:first-child th:last-child{border-radius:0 9px 0 0}.check-list{display:grid;gap:9px;margin:22px 0}.check-item{position:relative;padding:12px 14px 12px 43px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:13px}.check-item::before{content:"✓";position:absolute;left:14px;top:11px;width:20px;height:20px;border:1px solid #cdbb99;border-radius:50%;display:grid;place-items:center;color:var(--gold-dark);font-size:10px}.inline-cta{margin:42px 0;padding:27px;border-radius:17px;background:#171715;color:#fff}.inline-cta h3{margin:0 0 8px;color:#fff;font-family:var(--serif);font-size:22px}.inline-cta p{margin:0 0 17px;color:rgba(255,255,255,.68);font-size:12px}.inline-cta a{display:inline-flex;align-items:center;gap:22px;border-radius:10px;background:#fff;color:#171715;padding:12px 17px;text-decoration:none;font-weight:700;font-size:12px}.article-aside{position:sticky;top:104px;display:grid;gap:16px}.toc,.aside-cta,.related-box{padding:22px;border:1px solid var(--line);border-radius:16px;background:rgba(255,254,250,.92);box-shadow:var(--shadow-sm)}.toc h2,.related-box h2{margin:0 0 13px;font-family:var(--serif);font-size:17px;font-weight:500}.toc ol{display:grid;gap:9px;margin:0;padding:0;list-style:none;counter-reset:toc}.toc li{counter-increment:toc}.toc a{display:grid;grid-template-columns:22px 1fr;gap:7px;color:#5e594f;text-decoration:none;font-size:11px;line-height:1.6}.toc a::before{content:counter(toc,decimal-leading-zero);color:var(--gold-dark);font:600 9px var(--number);padding-top:3px}.toc a:hover{color:var(--gold-dark)}.aside-cta{background:#171715;color:#fff}.aside-cta strong{display:block;font-family:var(--serif);font-size:18px;font-weight:500}.aside-cta p{margin:8px 0 14px;color:rgba(255,255,255,.65);font-size:10px}.aside-cta a{display:flex;justify-content:space-between;border-radius:9px;background:#fff;color:#171715;padding:11px 13px;text-decoration:none;font-size:11px;font-weight:700}.related-section{padding:0 0 84px}.related-section h2{margin:0 0 22px;font-family:var(--serif);font-size:29px;font-weight:500}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.related-link{padding:22px;border:1px solid var(--line);border-radius:14px;background:rgba(255,254,250,.83);text-decoration:none}.related-link small{color:var(--gold-dark);font-size:9px;font-weight:700;letter-spacing:.08em}.related-link strong{display:block;margin-top:9px;font-family:var(--serif);font-size:17px;font-weight:500;line-height:1.6}.related-link:hover{border-color:#cdbb99;box-shadow:var(--shadow-sm)}.site-footer{border-top:1px solid var(--line);background:#f3efe7}.footer-main{display:flex;justify-content:space-between;gap:30px;padding:34px 0}.footer-brand strong{font-family:var(--serif);font-weight:500}.footer-brand p{margin:7px 0 0;color:var(--muted);font-size:10px}.footer-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:13px 22px;max-width:720px}.footer-links a{color:#625e55;font-size:10px;text-decoration:none}.footer-links a:hover{text-decoration:underline}.footer-bottom{padding:13px 0 20px;border-top:1px solid var(--line);color:var(--muted);font-size:9px;text-align:center}.disclaimer{margin-top:38px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:10px}@media(max-width:960px){.article-layout{grid-template-columns:1fr}.article-aside{position:static;grid-template-columns:1fr 1fr}.toc{grid-column:1/-1}.related-grid{grid-template-columns:1fr 1fr}.site-nav{gap:14px}.site-nav a:not(.header-cta){display:none}.menu-button{display:grid;place-items:center}.site-nav{position:absolute;top:78px;left:14px;right:14px;display:none;flex-direction:column;align-items:stretch;padding:15px;border:1px solid var(--line);border-radius:15px;background:rgba(255,254,250,.98);box-shadow:var(--shadow)}.site-nav.open{display:flex}.site-nav a:not(.header-cta){display:block;padding:9px 5px}}@media(max-width:720px){.wrap{width:min(100% - 28px,1160px)}.header-inner{min-height:68px}.brand-mark{width:37px;height:37px}.brand-copy strong{font-size:15px}.listing-hero,.article-hero{padding:44px 0 35px}.article-grid{grid-template-columns:1fr;padding-bottom:58px}.article-card{min-height:0;padding:23px}.listing-cta{grid-template-columns:1fr;padding:27px 23px}.article-layout{gap:25px;padding-bottom:60px}.article-body{padding:28px 20px}.article-body h2{font-size:25px;margin-top:43px}.article-body h3{font-size:18px}.article-aside{grid-template-columns:1fr}.data-table{display:block;overflow-x:auto;white-space:nowrap}.related-grid{grid-template-columns:1fr}.footer-main{flex-direction:column}.footer-links{justify-content:flex-start}.site-nav{top:68px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}