:root{color-scheme:light;--color-bg: #fbfcf8;--color-surface: #ffffff;--color-text: #1f2a24;--color-muted: #607066;--color-border: #dbe4d8;--color-accent: #226b4a;--color-accent-strong: #174b35;--color-warning-bg: #fff7df;--color-warning-border: #e5bf55;--color-affiliate-bg: #f9f1e8;--color-affiliate-border: #d8ad80;--shadow-soft: 0 12px 32px rgb(31 42 36 / 8%);font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--color-bg);color:var(--color-text);line-height:1.75}a{color:var(--color-accent);text-decoration-thickness:.08em;text-underline-offset:.16em}.site-shell{min-height:100vh;display:flex;flex-direction:column}.site-header,.site-footer{border-color:var(--color-border);border-style:solid;border-width:0}.site-header{background:#fbfcf8eb;border-bottom-width:1px}.site-header__inner,.site-footer__inner,.page{width:min(100% - 32px,1040px);margin-inline:auto}.site-header__inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}.site-brand{color:var(--color-text);font-weight:700;text-decoration:none}.site-nav{display:flex;flex-wrap:wrap;gap:16px;font-size:.95rem}.site-nav a{color:var(--color-muted);text-decoration:none}.site-nav a:hover,.site-nav a:focus-visible{color:var(--color-accent)}.page{flex:1;padding-block:56px 72px}.site-footer{border-top-width:1px}.site-footer__inner{padding-block:24px;color:var(--color-muted);font-size:.9rem}.hero{max-width:760px}.hero h1,.article h1{margin:0;font-size:clamp(2rem,5vw,3.6rem);line-height:1.18;letter-spacing:0}.hero p,.article__lead{color:var(--color-muted);font-size:1.08rem}.section{margin-top:56px}.section h2,.source-list h2{margin:0 0 16px;font-size:1.35rem}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}.article-card,.product-card,.notice{border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface);box-shadow:var(--shadow-soft)}.article-card a,.product-card{display:block;height:100%;padding:20px;color:inherit;text-decoration:none}.article-card h2,.product-card h3{margin:8px 0;font-size:1.1rem;line-height:1.4}.article-card p,.product-card p{margin:8px 0 0;color:var(--color-muted)}.article-card__meta,.meta-list,.source-list,.status-list{color:var(--color-muted);font-size:.92rem}.article-card__meta{display:flex;flex-wrap:wrap;gap:10px}.article{max-width:760px}.article :where(h2,h3){margin-top:40px;line-height:1.35}.article :where(p,ul,ol){margin-block:18px}.notice{margin-block:20px;padding:16px 18px}.notice p{margin:0}.notice--affiliate{background:var(--color-affiliate-bg);border-color:var(--color-affiliate-border)}.notice--warning{background:var(--color-warning-bg);border-color:var(--color-warning-border)}.meta-list{display:flex;flex-wrap:wrap;gap:12px 20px;margin-block:20px}.meta-list div{display:flex;gap:6px}.meta-list dt{font-weight:700}.meta-list dd{margin:0}.source-list{margin-top:48px;padding-top:24px;border-top:1px solid var(--color-border)}.source-list ol{padding-left:1.3rem}.source-list li+li{margin-top:14px}.source-list__title{color:var(--color-text);font-weight:700}.source-list a{margin-left:8px}.source-list__missing{color:#a65024}.status-list{display:grid;gap:10px;padding-left:1.2rem}@media(max-width:680px){.site-header__inner{align-items:flex-start;flex-direction:column;justify-content:center;padding-block:16px}.page{padding-block:40px 56px}}.nature-site{--nature-ink: #102027;--nature-ink-soft: #294047;--nature-green: #2f5d50;--nature-green-bright: #6f9a79;--nature-reed: #a58b5f;--nature-paper: #f7f8f5;--nature-mist: #e7ece8;--nature-white: #ffffff;--nature-clay: #a85c3a;--nature-line: #cbd6d0;--nature-shadow: 0 18px 45px rgb(16 32 39 / 10%);background:var(--nature-paper);color:var(--nature-ink);font-family:Yu Gothic,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;letter-spacing:0}.nature-site :where(h1,h2,h3,p,a,span,li,dt,dd,strong,small){overflow-wrap:anywhere}.nature-site a:focus-visible,.nature-site button:focus-visible{outline:3px solid #e6b86a;outline-offset:4px}.nature-site .skip-link{position:fixed;top:12px;left:12px;z-index:100;padding:10px 14px;background:var(--nature-white);color:var(--nature-ink);border-radius:4px;transform:translateY(-150%)}.nature-site .skip-link:focus{transform:translateY(0)}.nature-site .site-header{position:relative;z-index:20;background:#f7f8f5f5;border-color:var(--nature-line)}.nature-site .site-header__inner,.nature-site .site-footer__inner,.nature-site .content-shell{width:min(100% - 48px,1180px);margin-inline:auto}.nature-site .site-header__inner{min-height:78px}.nature-site .site-brand{display:inline-flex;align-items:center;gap:12px;color:var(--nature-ink)}.nature-site .site-brand__mark{display:block;width:28px;height:28px;border:2px solid var(--nature-green);border-radius:50% 50% 48% 52%;box-shadow:inset -8px 0 0 var(--nature-reed)}.nature-site .site-brand span:last-child{display:grid;line-height:1.2}.nature-site .site-brand strong{font-size:1rem}.nature-site .site-brand small{margin-top:3px;color:#5f716a;font-size:.72rem;font-weight:500}.nature-site .site-nav{gap:24px;font-size:.88rem;font-weight:600}.nature-site .site-nav a{position:relative;width:fit-content;padding-block:8px;color:#4d625a}.nature-site .site-nav a[aria-current=page]{color:var(--nature-ink)}.nature-site .site-nav a[aria-current=page]:after{position:absolute;right:0;bottom:0;left:0;height:2px;background:var(--nature-green);content:""}.nature-site .page{width:100%;margin:0;padding:0}.nature-hero{position:relative;isolation:isolate;display:grid;min-height:min(68svh,660px);align-items:center;overflow:hidden;background:var(--nature-ink)}.nature-hero__image,.nature-hero__veil{position:absolute;inset:0;width:100%;height:100%}.nature-hero__image{z-index:-2;object-fit:cover;object-position:center}.nature-hero__veil{z-index:-1;background:#10202775}.nature-hero__content{padding-block:72px 80px;color:var(--nature-white)}.nature-hero h1{max-width:760px;margin:0;font-family:Georgia,Yu Mincho,Hiragino Mincho ProN,serif;font-size:4.8rem;font-weight:500;line-height:1;letter-spacing:0}.nature-hero__thesis{margin:20px 0 0;font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:2rem;font-weight:600;line-height:1.35}.nature-hero__description{max-width:620px;margin:24px 0 0;color:#ffffffe0;font-size:1.05rem;line-height:1.9}.release-status{width:fit-content;margin:0 0 28px;padding-left:12px;border-left:3px solid #d7b678;color:#ffffffd1;font-size:.75rem;font-weight:700}.release-status--dark{border-left-color:var(--nature-clay);color:var(--nature-ink-soft)}.nature-hero__actions{display:flex;flex-wrap:wrap;align-items:center;gap:22px;margin-top:34px}.button{display:inline-flex;min-height:46px;align-items:center;justify-content:center;padding:11px 18px;border:1px solid transparent;border-radius:4px;font-size:.92rem;font-weight:700;text-decoration:none;transition:background-color .16s ease,color .16s ease,transform .16s ease}.button:hover{transform:translateY(-2px)}.button--light{background:var(--nature-white);color:var(--nature-ink)}.button--light:hover{background:#eaf0ec}.text-link{color:var(--nature-green);font-size:.9rem;font-weight:700;text-underline-offset:.3em}.text-link--light{color:var(--nature-white)}.ecotone-line{height:38px;overflow:hidden;background:var(--nature-paper)}.ecotone-line svg{display:block;width:100%;height:100%}.ecotone-line path{fill:none;stroke:var(--nature-green);stroke-width:2;vector-effect:non-scaling-stroke}.page-band{padding-block:76px}.introduction-band{padding-top:64px}.split-introduction{display:grid;grid-template-columns:minmax(260px,.82fr) minmax(320px,1.18fr);gap:80px;align-items:start}.section-label{margin:0 0 12px;color:var(--nature-clay);font-size:.75rem;font-weight:800}.section-heading h2,.split-introduction h2,.resources-layout h2,.source-preview-layout h2,.policy-content h2,.article-products h2{margin:0;color:var(--nature-ink);font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:2rem;font-weight:600;line-height:1.45;letter-spacing:0}.prose-lead p,.resources-layout>div>p,.source-preview-layout__heading>p{margin:0;color:#536760;line-height:1.95}.prose-lead p+p{margin-top:16px}.categories-band{background:var(--nature-mist)}.section-heading{max-width:720px;margin-bottom:34px}.section-heading--with-link{display:flex;max-width:none;align-items:end;justify-content:space-between;gap:24px}.category-index{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid #bac9c1}.category-index__item{min-height:190px;padding:26px 24px 24px 0;border-bottom:1px solid #bac9c1}.category-index__item:not(:nth-child(3n+1)){padding-left:24px;border-left:1px solid #bac9c1}.category-index__number{color:var(--nature-reed);font-family:Georgia,serif;font-size:.78rem}.category-index h3{margin:22px 0 8px;font-size:1.1rem;line-height:1.4}.category-index p{margin:0;color:#61736c;font-size:.9rem;line-height:1.7}.articles-band,.resources-band,.policy-band,.article-content-band{background:var(--nature-white)}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.nature-site .article-card{min-width:0;border-color:var(--nature-line);border-radius:6px;box-shadow:0 8px 22px #10202712;transition:border-color .16s ease,box-shadow .16s ease,transform .16s ease}.nature-site .article-card:hover{border-color:#9db1a7;box-shadow:var(--nature-shadow);transform:translateY(-3px)}.nature-site .article-card a{display:flex;min-height:100%;flex-direction:column;padding:24px}.nature-site .article-card__meta{gap:8px 14px;color:var(--nature-green);font-size:.72rem;font-weight:800}.nature-site .article-card h2{margin:18px 0 10px;font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:1.3rem}.nature-site .article-card p{margin:0;color:#586b64;font-size:.9rem;line-height:1.75}.article-card__tags{display:flex;flex-wrap:wrap;gap:6px 12px;margin-top:22px;color:#718179;font-size:.72rem}.article-card__tags span:before{content:"#"}.article-card__footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 16px;margin-top:auto;padding-top:24px;color:#687a72;font-size:.72rem}.workflow-band{background:var(--nature-ink);color:var(--nature-white)}.section-heading--inverse h2,.workflow-band .section-label{color:var(--nature-white)}.workflow-band .section-label{opacity:.66}.workflow-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:0;padding:0;list-style:none;counter-reset:workflow}.workflow-list li{min-height:180px;padding:28px 24px;border-top:1px solid rgb(255 255 255 / 22%);border-left:1px solid rgb(255 255 255 / 22%);counter-increment:workflow}.workflow-list li:last-child{border-right:1px solid rgb(255 255 255 / 22%)}.workflow-list li:before{display:block;margin-bottom:32px;color:#d7b678;font-family:Georgia,serif;content:"0" counter(workflow)}.workflow-list strong,.workflow-list span{display:block}.workflow-list strong{font-size:1rem}.workflow-list span{margin-top:10px;color:#ffffffad;font-size:.84rem;line-height:1.7}.sources-band{background:#edf1ee}.source-preview-layout{display:grid;grid-template-columns:minmax(250px,.78fr) minmax(420px,1.22fr);gap:72px}.source-preview-list{border-top:1px solid #b7c6be}.source-preview{display:grid;grid-template-columns:120px minmax(0,1fr) auto;gap:10px 18px;align-items:start;padding-block:22px;border-bottom:1px solid #b7c6be}.source-preview p,.source-preview h3,.source-preview span{margin:0}.source-preview p,.source-preview span{color:#607168;font-size:.72rem}.source-preview h3{font-size:.92rem;line-height:1.55}.source-preview a{grid-column:2;width:fit-content;color:var(--nature-green);font-size:.78rem;font-weight:700}.resources-layout{display:grid;grid-template-columns:minmax(280px,1fr) minmax(340px,.8fr);gap:80px;align-items:start}.resources-layout>div>p{max-width:650px;margin-top:20px}.nature-site .notice{border-color:var(--nature-line);border-radius:6px;box-shadow:none}.nature-site .notice--learning{border-left:4px solid var(--nature-green);background:#f1f6f2}.nature-site .notice--affiliate{border-left:4px solid var(--nature-reed);background:#faf7f0}.nature-site .notice--warning{border-left:4px solid var(--nature-clay);background:#fff5ef}.page-intro{background:var(--nature-mist)}.page-intro__inner{padding-block:72px 62px}.page-intro h1,.article-header h1{max-width:900px;margin:0;font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:3.5rem;font-weight:600;line-height:1.22;letter-spacing:0}.page-intro__inner>p:last-child,.article-header__lead{max-width:720px;margin:22px 0 0;color:#536760;font-size:1rem;line-height:1.85}.article-index-summary{display:flex;flex-wrap:wrap;gap:12px 28px;margin-bottom:28px;color:#5b6d65;font-size:.8rem}.article-header{background:var(--nature-mist)}.article-header__inner{padding-block:54px 66px}.breadcrumb{display:flex;gap:8px;margin-bottom:44px;color:#66776f;font-size:.76rem}.breadcrumb a{color:inherit}.article-state{display:flex;flex-wrap:wrap;gap:8px 18px;margin-bottom:22px;color:var(--nature-green);font-size:.74rem;font-weight:800}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(220px,280px);gap:80px;align-items:start}.article-main{min-width:0}.article-body{color:#253a34;font-size:1rem}.article-body h2{margin:54px 0 18px;padding-top:18px;border-top:1px solid var(--nature-line);font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:1.6rem;line-height:1.45}.article-body p,.article-body li{line-height:2}.article-body ul,.article-body ol{padding-left:1.4rem}.article-rail{position:sticky;top:28px;padding-top:18px;border-top:2px solid var(--nature-green)}.nature-site .article-rail .meta-list{display:grid;gap:12px;margin-block:18px 24px}.nature-site .article-rail .meta-list div,.article-facts div{display:grid;grid-template-columns:88px 1fr;gap:8px}.article-facts{display:grid;gap:12px;margin:0 0 28px;color:#607168;font-size:.82rem}.article-facts dt,.article-facts dd{margin:0}.article-facts dt,.nature-site .meta-list dt{color:var(--nature-ink)}.nature-site .source-list{margin-top:64px;padding-top:30px;border-top:2px solid var(--nature-ink)}.nature-site .source-list h2{font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:1.55rem}.nature-site .source-list li{padding-left:8px;color:#536760;line-height:1.75}.nature-site .source-list li+li{margin-top:24px}.nature-site .source-list__title{color:var(--nature-ink)}.nature-site .source-list p{margin:8px 0 0;font-size:.8rem}.article-products{margin-top:64px}.product-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:22px}.policy-layout{display:grid;grid-template-columns:220px minmax(0,720px);gap:80px;align-items:start}.policy-nav{position:sticky;top:28px;display:grid;gap:12px;padding-top:18px;border-top:2px solid var(--nature-green)}.policy-nav a{color:#566960;font-size:.84rem}.policy-content section+section{margin-top:58px;padding-top:42px;border-top:1px solid var(--nature-line)}.policy-content p,.policy-content li{color:#33473f;line-height:2}.nature-site .site-footer{background:var(--nature-ink);border:0;color:var(--nature-white)}.nature-site .site-footer__inner{display:grid;grid-template-columns:minmax(260px,1fr) auto;gap:28px 64px;padding-block:46px;color:#ffffffb8}.nature-site .site-footer strong{color:var(--nature-white);font-family:Georgia,serif;font-size:1.15rem}.nature-site .site-footer p{max-width:620px;margin:8px 0 0}.nature-site .site-footer nav{display:flex;flex-wrap:wrap;gap:14px 22px}.nature-site .site-footer a{color:var(--nature-white);font-size:.82rem}.site-footer__status{grid-column:1 / -1;padding-top:22px;border-top:1px solid rgb(255 255 255 / 16%);font-size:.72rem}@media(max-width:900px){.nature-site .site-header__inner{min-height:92px;align-items:center}.nature-site .site-nav{gap:10px 18px}.nature-hero h1{font-size:4rem}.split-introduction,.source-preview-layout,.resources-layout,.article-layout,.policy-layout{grid-template-columns:1fr;gap:40px}.article-grid,.category-index{grid-template-columns:repeat(2,minmax(0,1fr))}.category-index__item:not(:nth-child(3n+1)){padding-left:0;border-left:0}.category-index__item:nth-child(2n){padding-left:24px;border-left:1px solid #bac9c1}.workflow-list{grid-template-columns:repeat(2,minmax(0,1fr))}.workflow-list li:nth-child(2){border-right:1px solid rgb(255 255 255 / 22%)}.article-rail,.policy-nav{position:static}}@media(max-width:640px){.nature-site .site-header__inner,.nature-site .site-footer__inner,.nature-site .content-shell{width:min(100% - 32px,1180px)}.nature-site .site-header__inner{min-height:auto;align-items:flex-start;gap:12px;padding-block:15px}.nature-site .site-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;gap:4px 18px;font-size:.76rem}.nature-site .site-nav a{min-width:0;padding-block:5px}.nature-hero{min-height:min(64svh,560px)}.nature-hero__image{object-position:42% center}.nature-hero__content{padding-block:56px 62px}.nature-hero h1{font-size:3rem}.nature-hero__thesis{font-size:1.55rem}.nature-hero__description{max-width:330px;font-size:.94rem}.page-band{padding-block:54px}.section-heading h2,.split-introduction h2,.resources-layout h2,.source-preview-layout h2,.policy-content h2,.article-products h2{font-size:1.6rem}.section-heading--with-link{align-items:flex-start;flex-direction:column}.article-grid,.category-index,.workflow-list,.product-grid{grid-template-columns:1fr}.category-index__item,.category-index__item:nth-child(2n){min-height:auto;padding:22px 0;border-right:0;border-left:0}.workflow-list li,.workflow-list li:nth-child(2),.workflow-list li:last-child{min-height:auto;padding:24px 0;border-right:0;border-left:0}.workflow-list li:before{margin-bottom:18px}.source-preview{grid-template-columns:1fr}.source-preview a{grid-column:1}.page-intro__inner,.article-header__inner{padding-block:50px}.page-intro h1,.article-header h1{font-size:2.4rem}.breadcrumb{margin-bottom:32px}.nature-site .site-footer__inner{grid-template-columns:1fr}.site-footer__status{grid-column:1}}@media(prefers-reduced-motion:reduce){.nature-site *,.nature-site *:before,.nature-site *:after{scroll-behavior:auto!important;transition-duration:.01ms!important}}