:root{--paper:#fdfdfb;--paper-2:#f7f7f3;--ink:#1c1c19;--ink-2:#55554e;--mute:#8e8e85;--hair:#e6e6df;--accent:#254b3c;--accent-soft:#eef2ee;--line-green:#06c755}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans JP",-apple-system,sans-serif;background:var(--paper);color:var(--ink);line-height:2;letter-spacing:.02em;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block;height:auto}
.en{font-family:"Inter",sans-serif;letter-spacing:.14em}
.wrap{max-width:1060px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;z-index:100;background:rgba(253,253,251,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--hair)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:34px;height:34px}
.brand .bt{font-size:13px;font-weight:500;letter-spacing:.1em;line-height:1.4}
.brand .bt small{display:block;font-size:10px;color:var(--mute);font-weight:400;letter-spacing:.16em}
.nav-cta{border:1px solid var(--ink);padding:8px 18px;border-radius:999px;font-size:12px;letter-spacing:.08em;white-space:nowrap;transition:all .25s}
.nav-cta:hover{background:var(--ink);color:var(--paper)}
.navlinks{display:flex;gap:24px;align-items:center;font-size:13px;color:var(--ink-2)}
@media(max-width:760px){.navlinks a:not(.nav-cta){display:none}}
.crumb{font-size:12px;color:var(--mute);padding:22px 0 0}
.crumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumb li+li::before{content:"›";margin-right:6px}
.crumb a{border-bottom:1px solid var(--hair)}
article,.col-index{max-width:740px;margin:0 auto;padding:40px 0 80px}
.a-cat{display:inline-block;font-size:11px;letter-spacing:.24em;color:var(--accent);border-bottom:1px solid var(--accent);padding-bottom:6px;margin-bottom:22px;font-weight:500}
article h1,.col-index h1{font-size:clamp(24px,4vw,32px);font-weight:500;line-height:1.7;letter-spacing:.04em;margin-bottom:18px}
.a-meta{font-size:12px;color:var(--mute);margin-bottom:34px;display:flex;gap:16px;flex-wrap:wrap}
.a-lead{font-size:15px;color:var(--ink-2);line-height:2.2;margin-bottom:36px}
.toc{background:var(--paper-2);border:1px solid var(--hair);border-radius:12px;padding:24px 28px;margin-bottom:48px}
.toc p{font-size:12px;letter-spacing:.2em;color:var(--accent);font-weight:500;margin-bottom:8px}
.toc ol{padding-left:1.4em;font-size:14px;color:var(--ink-2)}
.toc a:hover{color:var(--ink)}
.a-body h2{font-size:clamp(19px,2.6vw,23px);font-weight:500;line-height:1.7;letter-spacing:.04em;margin:64px 0 20px;padding-left:16px;border-left:3px solid var(--accent);scroll-margin-top:84px}
.a-body h3{font-size:17px;font-weight:500;margin:36px 0 12px;letter-spacing:.04em}
.a-body p{font-size:15px;line-height:2.2;margin-bottom:20px;color:#2c2c28}
.a-body ul,.a-body ol{padding-left:1.4em;margin-bottom:22px;font-size:15px;line-height:2.1;color:#2c2c28}
.a-body li{margin-bottom:4px}
.a-body strong{font-weight:500;background:linear-gradient(transparent 62%,var(--accent-soft) 62%)}
.a-body table{width:100%;border-collapse:collapse;font-size:14px;margin:8px 0 26px}
.a-body th,.a-body td{border:1px solid var(--hair);padding:12px 14px;text-align:left;vertical-align:top;line-height:1.8}
.a-body th{background:var(--paper-2);font-weight:500;white-space:nowrap}
.tbl{overflow-x:auto;-webkit-overflow-scrolling:touch}
.point{background:var(--accent-soft);border-radius:12px;padding:22px 26px;margin:10px 0 28px;font-size:14px;line-height:2}
.point b{display:block;font-size:12px;letter-spacing:.2em;color:var(--accent);margin-bottom:4px;font-weight:500}
.cta-box{border:1px solid var(--hair);border-radius:14px;padding:34px 30px;text-align:center;margin:56px 0;background:var(--paper)}
.cta-box .c-tag{font-size:11px;letter-spacing:.24em;color:var(--accent);margin-bottom:10px}
.cta-box h2,.cta-box .c-h{font-size:19px;font-weight:500;margin:0 0 10px;padding:0;border:0;letter-spacing:.04em}
.cta-box p{font-size:13px;color:var(--ink-2);margin-bottom:22px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:15px 32px;border-radius:999px;font-size:13px;letter-spacing:.08em;font-weight:500;transition:all .25s}
.btn-line{background:var(--line-green);color:#fff}
.btn-line:hover{opacity:.85}
.btn-sub{display:inline-block;margin-left:14px;font-size:13px;color:var(--ink-2);border-bottom:1px solid var(--hair)}
@media(max-width:520px){.btn-sub{margin:14px 0 0}}
.author{display:flex;gap:18px;align-items:center;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);padding:24px 0;margin-top:48px}
.author img{width:72px;height:72px;border-radius:50%;object-fit:cover;flex-shrink:0}
.author p{font-size:13px;color:var(--ink-2);line-height:1.9}
.author b{display:block;color:var(--ink);font-weight:500;font-size:14px}
.related{margin-top:56px}
.related h2{font-size:15px;letter-spacing:.2em;color:var(--accent);font-weight:500;margin-bottom:16px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.card{display:block;border:1px solid var(--hair);border-radius:12px;padding:22px 22px 20px;background:var(--paper);transition:border-color .25s,transform .25s}
.card:hover{border-color:var(--ink);transform:translateY(-2px)}
.card .k{font-size:11px;color:var(--accent);letter-spacing:.16em;margin-bottom:6px}
.card .t{font-size:15px;font-weight:500;line-height:1.7;margin-bottom:8px}
.card .d{font-size:12px;color:var(--mute);line-height:1.8}
.col-index .cards{grid-template-columns:1fr}
.col-index .card .t{font-size:17px}
footer{border-top:1px solid var(--hair);padding:44px 0 36px;font-size:12px;color:var(--mute);background:var(--paper-2)}
footer address{font-style:normal;line-height:1.9;margin-bottom:18px}
footer .fl{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:18px}
footer .fl a:hover{color:var(--ink)}