:root{--bg: #f6f7f9;--surface: #ffffff;--surface-2: #eef0f4;--text: #1e2530;--text-muted: #4f5763;--text-faint: #656d79;--primary: #3e4a72;--primary-strong: #2d3557;--primary-soft: #e7e9f2;--accent: #2f6f8a;--border: #e2e5ea;--border-strong: #cfd4dd;--danger: #9a3b2f;--ok: #2f7a5b;--cat-sosaihi-bg: #e4f0ee;--cat-sosaihi-fg: #0a544b;--cat-fuka-bg: #efe7d8;--cat-fuka-fg: #7a5a1f;--cat-other-bg: #e9eaf1;--cat-other-fg: #3e4a72;--font-sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", "Meiryo", system-ui, -apple-system, "Segoe UI", sans-serif;--font-serif: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;--sp-1: 4px;--sp-2: 8px;--sp-3: 12px;--sp-4: 16px;--sp-5: 24px;--sp-6: 32px;--sp-7: 48px;--sp-8: 64px;--radius: 10px;--radius-lg: 16px;--shadow: 0 1px 2px rgba(20, 30, 33, .05), 0 4px 16px rgba(20, 30, 33, .06);--shadow-sm: 0 1px 2px rgba(20, 30, 33, .06);--shadow-lg: 0 6px 16px rgba(20, 30, 33, .07), 0 22px 48px rgba(20, 30, 33, .12);--content: 760px;--wide: 1080px;--ease: cubic-bezier(.2, .7, .2, 1);--ring: 0 0 0 3px color-mix(in srgb, var(--primary) 32%, transparent);--grad-primary: linear-gradient(135deg, var(--primary), color-mix(in srgb, var(--primary) 62%, var(--accent)));--grad-tint: color-mix(in srgb, var(--primary) 8%, transparent)}@media(prefers-color-scheme:dark){:root{--bg: #15181c;--surface: #1c2026;--surface-2: #262b33;--text: #e7eaef;--text-muted: #aab2bd;--text-faint: #8b93a0;--primary: #aab6e6;--primary-strong: #c2cbef;--primary-soft: #232842;--accent: #86b9d1;--border: #2d333c;--border-strong: #3a424c;--danger: #e0897c;--ok: #6bc59c;--cat-sosaihi-bg: #183531;--cat-sosaihi-fg: #83d8c9;--cat-fuka-bg: #342a1b;--cat-fuka-fg: #dab77c;--cat-other-bg: #242a44;--cat-other-fg: #aeb9e8;--shadow: 0 1px 2px rgba(0,0,0,.32), 0 6px 20px rgba(0,0,0,.38);--shadow-sm: 0 1px 2px rgba(0,0,0,.32);--shadow-lg: 0 8px 20px rgba(0,0,0,.4), 0 26px 56px rgba(0,0,0,.5)}}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;overflow-x:clip}@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}body{margin:0;background:var(--bg);background-image:radial-gradient(60rem 32rem at 88% -8%,var(--grad-tint),transparent 60%),radial-gradient(52rem 30rem at 6% 0%,color-mix(in srgb,var(--accent) 6%,transparent),transparent 55%);background-attachment:fixed;color:var(--text);font-family:var(--font-sans);font-size:17px;line-height:1.85;font-feature-settings:"palt";text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh;overflow-x:clip}img{max-width:100%;height:auto}a{color:var(--primary);text-underline-offset:2px;transition:color .15s var(--ease)}a:hover{color:var(--primary-strong)}button,summary,[role=button],label[for]{cursor:pointer}:focus-visible{outline:none;box-shadow:var(--ring);border-radius:6px}::selection{background:color-mix(in srgb,var(--primary) 22%,transparent)}:target{scroll-margin-top:5rem}[id]{scroll-margin-top:5rem}h1,h2,h3,h4{line-height:1.4;font-weight:700;color:var(--text);text-wrap:balance}h1{font-size:clamp(1.55rem,1.2rem + 1.6vw,2.15rem);letter-spacing:.01em;margin:0 0 var(--sp-4)}h2{font-size:clamp(1.25rem,1.1rem + .7vw,1.55rem);margin:var(--sp-7) 0 var(--sp-3);padding-bottom:var(--sp-2);position:relative}h2:after{content:"";display:block;position:absolute;left:0;bottom:0;height:3px;width:min(100%,100%);background:linear-gradient(90deg,var(--primary) 0,var(--primary-soft) 42%,transparent 100%);border-radius:3px}h3{font-size:1.15rem;margin:var(--sp-5) 0 var(--sp-2)}p{margin:0 0 var(--sp-4)}strong{font-weight:700}small{font-size:.82em;color:var(--text-muted)}.container{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--sp-4)}.container.wide{max-width:var(--wide)}main{flex:1 0 auto;padding-block:var(--sp-6) var(--sp-8)}.lead{font-size:1.08rem;color:var(--text-muted);text-wrap:pretty}.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--surface) 82%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--border)}.site-header__inner{max-width:var(--wide);margin-inline:auto;padding:var(--sp-3) var(--sp-4);display:flex;align-items:center;justify-content:space-between;gap:var(--sp-4)}.brand{display:inline-flex;align-items:center;gap:.55ch;font-weight:800;font-size:1.2rem;color:var(--text);text-decoration:none;letter-spacing:.02em}.brand:before{content:"";width:.62em;height:.62em;border-radius:4px;background:var(--grad-primary);box-shadow:0 1px 4px color-mix(in srgb,var(--primary) 45%,transparent);flex:none}.brand__mark{color:var(--primary)}.brand__tag{font-size:.72rem;color:var(--text-faint);font-weight:600}.site-nav{display:flex;gap:var(--sp-4);flex-wrap:wrap}.site-nav a{color:var(--text-muted);text-decoration:none;font-size:.92rem;font-weight:600;position:relative;padding:2px 0}.site-nav a:after{content:"";position:absolute;left:0;right:100%;bottom:-2px;height:2px;background:var(--primary);border-radius:2px;transition:right .2s var(--ease)}.site-nav a:hover{color:var(--primary)}.site-nav a:hover:after{right:0}.site-footer{flex-shrink:0;margin-top:var(--sp-8);background:var(--surface-2);border-top:1px solid var(--border);position:relative}.site-footer:before{content:"";position:absolute;top:-1px;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),color-mix(in srgb,var(--primary) 55%,var(--accent)),transparent)}.site-footer__inner{max-width:var(--wide);margin-inline:auto;padding:var(--sp-6) var(--sp-4);display:grid;gap:var(--sp-4);color:var(--text-muted);font-size:.88rem}.site-footer a{color:var(--text-muted)}.site-footer__links{display:flex;flex-wrap:wrap;gap:var(--sp-2) var(--sp-5)}.crumbs{font-size:.85rem;color:var(--text-muted);margin-bottom:var(--sp-4)}.crumbs a{text-decoration:none}.crumbs a:hover{text-decoration:underline}.crumbs span[aria-current]{color:var(--text)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--sp-5);box-shadow:var(--shadow-sm);transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease)}.grid{display:grid;gap:var(--sp-4)}@media(min-width:640px){.grid.cols-2{grid-template-columns:1fr 1fr}.grid.cols-3{grid-template-columns:repeat(3,1fr)}}a.card:hover,a.guide-card:hover,.cluster-feature:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:color-mix(in srgb,var(--primary) 45%,var(--border))}a.card:active,a.guide-card:active,.cluster-feature:active{transform:translateY(-1px)}.benefit-cat{margin:var(--sp-5) 0}.benefit-cat__head{display:flex;align-items:center;gap:var(--sp-3);margin-bottom:var(--sp-3)}.benefit{background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:var(--radius);padding:var(--sp-4) var(--sp-5);margin-bottom:var(--sp-3);box-shadow:var(--shadow-sm);transition:box-shadow .2s var(--ease),transform .2s var(--ease)}.benefit:hover{box-shadow:var(--shadow);transform:translate(2px)}.benefit--indep{border-left-color:var(--accent)}.benefit__name{font-weight:700;font-size:1.05rem;margin:0 0 var(--sp-1)}.benefit__amount{font-size:1.3rem;font-weight:800;color:var(--primary-strong);background:linear-gradient(180deg,transparent 62%,var(--primary-soft) 62%);padding:0 .15em}.benefit dl{display:grid;grid-template-columns:max-content 1fr;gap:var(--sp-1) var(--sp-4);margin:var(--sp-3) 0 0;font-size:.93rem}.benefit dt{color:var(--text-faint);font-weight:600}.benefit dd{margin:0}.badge{display:inline-block;font-size:.74rem;font-weight:700;padding:3px 10px;border-radius:999px;letter-spacing:.02em;border:1px solid transparent}.badge--sosaihi{background:var(--cat-sosaihi-bg);color:var(--cat-sosaihi-fg);border-color:color-mix(in srgb,var(--cat-sosaihi-fg) 22%,transparent)}.badge--fuka{background:var(--cat-fuka-bg);color:var(--cat-fuka-fg);border-color:color-mix(in srgb,var(--cat-fuka-fg) 22%,transparent)}.badge--other{background:var(--cat-other-bg);color:var(--cat-other-fg);border-color:color-mix(in srgb,var(--cat-other-fg) 22%,transparent)}.badge--indep{background:var(--cat-fuka-bg);color:var(--cat-fuka-fg)}.callout{border-radius:var(--radius);padding:var(--sp-4) var(--sp-5);margin:var(--sp-4) 0;font-size:.95rem;border:1px solid var(--border);background:var(--surface-2)}.callout--info{border-color:color-mix(in srgb,var(--primary) 40%,var(--border));background:var(--primary-soft)}.callout--warn{border-color:color-mix(in srgb,var(--danger) 35%,var(--border))}.callout strong{color:var(--text)}.btn{display:inline-flex;align-items:center;gap:.5ch;font-weight:700;font-size:1rem;padding:12px 24px;border-radius:999px;text-decoration:none;cursor:pointer;border:2px solid transparent;transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease)}.btn--primary{background:var(--grad-primary);color:#fff;box-shadow:0 4px 14px color-mix(in srgb,var(--primary) 34%,transparent)}.btn--primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 8px 22px color-mix(in srgb,var(--primary) 42%,transparent)}.btn--primary:active{transform:translateY(0)}.btn--ghost{background:var(--surface);color:var(--primary);border-color:var(--border-strong)}.btn--ghost:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow)}.cta{position:relative;overflow:hidden;background:linear-gradient(160deg,var(--primary-soft),var(--surface));border:1px solid color-mix(in srgb,var(--primary) 24%,var(--border));border-radius:var(--radius-lg);padding:var(--sp-5);margin:var(--sp-6) 0}.cta:before{content:"";position:absolute;right:-3rem;top:-3rem;width:12rem;height:12rem;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--primary) 20%,transparent),transparent 70%);pointer-events:none}.cta h3{margin-top:0}.cta>*{position:relative}.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}table.data{width:100%;border-collapse:collapse;font-size:.92rem;min-width:560px;background:var(--surface)}table.data th,table.data td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border);vertical-align:top}table.data thead th{background:var(--surface-2);font-size:.82rem;color:var(--text-muted);white-space:nowrap;position:sticky;top:0}table.data tbody tr{transition:background .15s var(--ease)}table.data tbody tr:nth-child(2n){background:color-mix(in srgb,var(--surface-2) 45%,transparent)}table.data tbody tr:hover{background:var(--primary-soft)}table.data tbody tr:last-child td{border-bottom:0}.faq{margin:var(--sp-4) 0}.faq details{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin-bottom:var(--sp-2);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}.faq details[open]{box-shadow:var(--shadow-sm);border-color:color-mix(in srgb,var(--primary) 30%,var(--border))}.faq summary{cursor:pointer;font-weight:700;padding:var(--sp-4) var(--sp-5);list-style:none;position:relative}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"＋";position:absolute;right:var(--sp-5);color:var(--primary);font-weight:700;transition:transform .2s var(--ease)}.faq details[open] summary:after{content:"－"}.faq details>div{padding:0 var(--sp-5) var(--sp-4);color:var(--text-muted)}.sources{font-size:.85rem;color:var(--text-muted)}.sources h2{font-size:1.05rem}.sources li{margin-bottom:var(--sp-1);overflow-wrap:anywhere}.hero{position:relative;padding:var(--sp-7) 0 var(--sp-6)}.hero:before{content:"";position:absolute;inset:-20% -20% auto;height:130%;z-index:-1;pointer-events:none;background:radial-gradient(28rem 18rem at 82% 12%,color-mix(in srgb,var(--primary) 16%,transparent),transparent 62%),radial-gradient(24rem 16rem at 8% 8%,color-mix(in srgb,var(--accent) 12%,transparent),transparent 60%);filter:blur(6px)}.hero h1{max-width:22ch}.hero h1 strong{color:var(--primary-strong)}.hero .lead{max-width:46ch}.hero__actions{display:flex;flex-wrap:wrap;gap:var(--sp-3);margin-top:var(--sp-5)}.visually-hidden-focusable:not(:focus){position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;margin:-1px;padding:0;border:0}.visually-hidden-focusable:focus{position:fixed;left:var(--sp-3);top:var(--sp-2);z-index:60;width:auto;height:auto;background:var(--primary);color:#fff;padding:10px 16px;border-radius:8px;box-shadow:var(--shadow-lg);clip:auto;clip-path:none;text-decoration:none;font-weight:700}.muted{color:var(--text-muted)}.mt-0{margin-top:0}.mb-0{margin-bottom:0}.list-plain{list-style:none;padding:0;margin:0}.chip-list{display:flex;flex-wrap:wrap;gap:var(--sp-2);list-style:none;padding:0;margin:var(--sp-3) 0}.chip-list a{display:inline-block;padding:6px 14px;background:var(--surface);border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--text);font-size:.9rem;font-weight:600;transition:transform .15s var(--ease),border-color .15s var(--ease),color .15s var(--ease),box-shadow .15s var(--ease)}.chip-list a:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.updated{font-size:.82rem;color:var(--text-faint)}.prose{font-size:1.05rem}.prose h2{margin-top:var(--sp-7)}.prose h3{margin-top:var(--sp-5);font-size:1.08rem}.prose p{margin:0 0 var(--sp-4)}.prose ul,.prose ol{margin:0 0 var(--sp-4);padding-left:1.4em}.prose li{margin-bottom:var(--sp-2)}.prose li::marker{color:var(--primary)}.prose strong{color:var(--text)}.prose blockquote{position:relative;margin:var(--sp-5) 0;padding:var(--sp-4) var(--sp-5) var(--sp-4) var(--sp-6);background:linear-gradient(180deg,var(--primary-soft),color-mix(in srgb,var(--primary-soft) 30%,var(--surface)));border-left:4px solid var(--primary);border-radius:0 var(--radius) var(--radius) 0;color:var(--text)}.prose blockquote:before{content:"“";position:absolute;left:.3rem;top:-.1rem;font-family:var(--font-serif);font-size:2.4rem;line-height:1;color:color-mix(in srgb,var(--primary) 45%,transparent)}.prose blockquote p{margin:0}.prose blockquote strong{color:var(--primary-strong)}.prose table{width:100%;border-collapse:collapse;margin:var(--sp-4) 0;font-size:.92rem;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--border);padding:9px 12px;text-align:left;vertical-align:top}.prose thead th{background:var(--surface-2);white-space:nowrap}.prose tbody tr:nth-child(2n){background:color-mix(in srgb,var(--surface-2) 45%,transparent)}.prose a{overflow-wrap:anywhere}.guide-card{display:block;text-decoration:none;color:inherit}.guide-card h3{margin:0 0 var(--sp-2);color:var(--primary-strong)}.guide-card p{margin:0;color:var(--text-muted);font-size:.95rem}@media(prefers-reduced-motion:no-preference){@keyframes jh-rise{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}.hero>*,main>.container>section,main>.container>.grid{animation:jh-rise .5s var(--ease) both}main>.container>section:nth-child(2){animation-delay:.05s}main>.container>section:nth-child(3){animation-delay:.1s}main>.container>section:nth-child(4){animation-delay:.15s}}