:root{--bg:#fbfaf7;--surface:#ffffff;--surface-2:#f5f1e9;--ink:#17130d;--ink-soft:#5f584a;--ink-faint:#8a8273;--line:#e8e2d6;--accent:#e97400;--accent-strong:#c95f00;--accent-soft:#fdeee0;--radius-lg:16px;--radius-md:10px;--header-h:60px;--max-w:1120px;--font-sans:"Hiragino Kaku Gothic ProN","Hiragino Sans","BIZ UDPGothic","Yu Gothic UI",Meiryo,system-ui,"Segoe UI",sans-serif}*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.85;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img,svg{max-width:100%;height:auto;display:block}a{color:var(--accent-strong);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{text-decoration:none}h1,h2,h3,h4{line-height:1.4;margin:0 0 .6em;font-weight:700;letter-spacing:.01em}:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:2px}.wrap{width:100%;max-width:var(--max-w);margin-inline:auto;padding-inline:20px}.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:100}.skip-link:focus{left:0}.site-header{position:sticky;top:0;z-index:50;background:rgba(251,250,247,.92);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:16px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:800;font-size:17px}.brand-mark{width:28px;height:28px;display:inline-flex;flex:none}.brand-mark svg{width:100%;height:100%}.site-nav{display:flex;gap:4px;flex-wrap:wrap}.nav-link{display:inline-block;padding:6px 12px;border-radius:999px;color:var(--ink-soft);text-decoration:none;font-size:14.5px;font-weight:600}.nav-link:hover{background:var(--surface-2);color:var(--ink)}.nav-link.is-active{background:var(--accent-soft);color:var(--accent-strong)}.hero{padding:64px 0 56px;background:radial-gradient(1200px 420px at 85% -10%,rgba(233,116,0,.16),transparent 60%),linear-gradient(180deg,#fff,var(--bg))}.hero-inner{max-width:760px}.eyebrow{display:inline-block;margin:0 0 16px;padding:4px 12px;border:1px solid var(--line);border-radius:999px;font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--ink-faint);background:var(--surface)}.hero h1{font-size:clamp(28px,5vw,44px);letter-spacing:.02em;margin:0 0 .4em}.hero-lead{font-size:clamp(16px,2.4vw,19px);color:var(--ink-soft);margin:0 0 28px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.hero--404{padding-block:96px;text-align:center}.hero--404 .hero-inner{margin-inline:auto}.btn{display:inline-block;padding:12px 22px;border-radius:999px;font-weight:700;font-size:15px;text-decoration:none;transition:transform .12s ease,background-color .12s ease,box-shadow .12s ease}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 16px -8px rgba(201,95,0,.7)}.btn-primary:hover{background:var(--accent-strong)}.btn-ghost{background:var(--surface);color:var(--ink);border:1px solid var(--line)}.btn-ghost:hover{border-color:var(--ink-faint)}.btn-block{display:block;text-align:center}.section-title{font-size:clamp(20px,3vw,26px);position:relative;padding-left:16px}.section-title::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:5px;border-radius:4px;background:var(--accent)}.latest{padding:48px 0}.about{padding:40px 0 64px}.about .prose{max-width:760px}.post-list{display:grid;gap:16px}.post-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);transition:border-color .15s ease,box-shadow .15s ease,transform .15s ease}.post-card:hover{border-color:var(--accent);box-shadow:0 12px 28px -18px rgba(23,19,13,.35);transform:translateY(-2px)}.post-card-link{display:block;padding:22px 24px;color:var(--ink);text-decoration:none}.post-card-meta{display:flex;gap:8px;margin:0 0 8px;font-size:13px;color:var(--ink-faint)}.post-card-title{font-size:clamp(18px,2.6vw,22px);margin:0 0 8px}.post-card-desc{margin:0 0 14px;color:var(--ink-soft)}.post-card-cta{font-weight:700;color:var(--accent-strong);font-size:14px}.prose{font-size:16.5px}.prose>:first-child{margin-top:0}.prose h2{font-size:clamp(20px,3vw,25px);margin:2.2em 0 .8em;padding-top:.4em;border-top:3px solid var(--ink);scroll-margin-top:calc(var(--header-h) + 16px)}.prose h3{font-size:clamp(17px,2.4vw,20px);margin:1.8em 0 .6em;scroll-margin-top:calc(var(--header-h) + 16px)}.prose p{margin:0 0 1.4em}.prose strong{font-weight:700}.prose a{text-decoration:underline}.prose ul,.prose ol{margin:0 0 1.4em;padding-left:1.4em}.prose li{margin:.35em 0}.prose blockquote{margin:0 0 1.6em;padding:14px 18px;border-left:4px solid var(--accent);background:var(--surface-2);border-radius:0 var(--radius-md)var(--radius-md)0;color:var(--ink-soft)}.prose table{width:100%;margin:0 0 1.6em;border-collapse:collapse;font-size:14.5px;border-radius:var(--radius-md);overflow:hidden}.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}.prose thead th{background:var(--surface-2);font-weight:700}.prose code{font-family:ui-monospace,Consolas,monospace;font-size:.9em;background:var(--surface-2);padding:2px 6px;border-radius:4px}.prose img{border-radius:var(--radius-md)}.article-page{padding:28px 0 72px;display:grid;grid-template-columns:minmax(0,1fr);gap:36px}.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px;padding:0;font-size:13px;color:var(--ink-faint)}.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}.breadcrumbs li:not(:last-child)::after{content:"›";color:var(--ink-faint)}.breadcrumbs a{color:var(--ink-soft);text-decoration:none}.breadcrumbs a:hover{color:var(--accent-strong);text-decoration:underline}.breadcrumbs li[aria-current]{color:var(--ink)}.article-head{margin-bottom:24px}.article-kicker{display:inline-block;margin:0 0 12px;padding:4px 12px;border-radius:999px;background:var(--accent-soft);color:var(--accent-strong);font-size:12px;font-weight:800;letter-spacing:.1em}.article-head h1{font-size:clamp(24px,4.4vw,36px);margin:0 0 14px}.article-meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0 0 16px;font-size:13.5px;color:var(--ink-faint)}.article-desc{margin:0;padding:14px 16px;background:var(--surface-2);border-radius:var(--radius-md);color:var(--ink-soft);font-size:14.5px}.toc-mobile{margin:0 0 20px;border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface)}.toc-mobile summary{cursor:pointer;padding:12px 16px;font-weight:700;font-size:14.5px}.toc-mobile[open] summary{border-bottom:1px solid var(--line)}.toc-mobile nav{padding:10px 16px 14px;font-size:14px}.toc nav ul,.toc-mobile nav ul{list-style:none;padding-left:0;margin:0}.toc nav ul ul,.toc-mobile nav ul ul{padding-left:16px}.toc nav li,.toc-mobile nav li{margin:.35em 0;line-height:1.6}.toc nav a,.toc-mobile nav a{color:var(--ink-soft);text-decoration:none}.toc nav a:hover,.toc-mobile nav a:hover{color:var(--accent-strong);text-decoration:underline}.article-aside{display:none}.faq{margin-top:2.6em}.faq h2{font-size:clamp(20px,3vw,25px);margin:0 0 .8em;padding-top:.4em;border-top:3px solid var(--ink)}.faq-item{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);margin:0 0 10px}.faq-item summary{cursor:pointer;padding:14px 16px;font-weight:700;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary::after{content:"+";font-size:20px;line-height:1;color:var(--accent)}.faq-item[open] summary::after{content:"–"}.faq-answer{padding:0 16px 14px;color:var(--ink-soft);font-size:14.5px}.article-foot{margin-top:2.6em;border-top:1px solid var(--line);padding-top:22px;display:grid;gap:16px}.keyword-box{font-size:13px;color:var(--ink-faint)}.keyword-box span{color:var(--ink-soft)}.author-box{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:14px 16px}.author-name{margin:0 0 2px;font-weight:700;font-size:15px}.author-desc{margin:0;font-size:13.5px;color:var(--ink-soft)}.disclaimer{font-size:12.5px;color:var(--ink-faint);background:var(--surface-2);border-radius:var(--radius-md);padding:12px 14px}.disclaimer p{margin:0}.list-head{padding:48px 0 8px}.list-head h1{font-size:clamp(26px,4vw,34px);margin:0 0 10px}.list-desc{margin:0;color:var(--ink-soft);max-width:640px}.site-footer{border-top:1px solid var(--line);background:var(--surface);margin-top:72px;padding:44px 0 28px}.footer-grid{display:grid;gap:24px;grid-template-columns:1fr}.footer-brand{font-weight:800;font-size:18px;margin:0 0 6px}.footer-about{color:var(--ink-soft);font-size:14px;max-width:520px}.footer-about p{margin:.2em 0}.footer-nav{display:flex;gap:18px;flex-wrap:wrap;font-size:14px}.footer-nav a{color:var(--ink-soft);text-decoration:none}.footer-nav a:hover{color:var(--accent-strong);text-decoration:underline}.footer-hr{border:0;border-top:1px solid var(--line);margin:24px 0}.footer-note{font-size:12px;color:var(--ink-faint);max-width:760px}.footer-copy{font-size:12.5px;color:var(--ink-faint);margin:18px 0 0}@media(min-width:1024px){.post-list{grid-template-columns:repeat(2,minmax(0,1fr))}.article-page{grid-template-columns:minmax(0,720px)minmax(0,300px);justify-content:center;column-gap:48px;align-items:start;padding-inline:20px}.wrap--article{margin:0;padding-inline:0;width:100%}.wrap--aside{margin:0;padding-inline:0;width:100%}.toc-mobile{display:none}.article-aside{display:block;position:sticky;top:calc(var(--header-h) + 24px)}.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:18px 20px;font-size:14px}.toc-title{font-weight:800;margin:0 0 10px;font-size:15px}.toc nav ul{max-height:56vh;overflow:auto;padding-right:6px}.aside-card{margin-top:16px;background:var(--accent-soft);border:1px solid var(--line);border-radius:var(--radius-lg);padding:16px 18px}.aside-card-text{margin:0 0 12px;font-size:13.5px;color:var(--ink-soft)}}@media(max-width:640px){.header-inner{flex-direction:column;height:auto;padding-block:12px;gap:8px}.site-nav{width:100%;justify-content:center}.hero{padding:44px 0 40px}.btn{padding:11px 18px;font-size:14px}}