@charset "UTF-8";
:root{--ink:#172e49;--muted:#61758a;--line:#dce5ed;--blue:#185fc3;--blue-dark:#104b9b;--light:#edf5ff;--paper:#fff;--bg:#f7f9fc;--green:#267a66;--rail:248px;--header:76px;font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:108px}body{margin:0;font-size:15px;line-height:1.85}a{color:inherit;text-decoration:none}a,button,summary{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:disabled{cursor:default}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid 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p{font-size:12px;color:var(--muted);margin-top:4px}.small-label{font-size:10px;font-weight:700;letter-spacing:.13em;color:#768ba0}.route-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.route-card{padding:22px;border:1px solid var(--line);border-radius:9px;background:white;position:relative;transition:transform .2s,border-color .2s}.route-card:hover{transform:translateY(-3px);border-color:#9ebde4}.route-card .num{font-family:monospace;font-size:11px;letter-spacing:.07em;color:var(--blue);margin-bottom:13px;display:block}.route-card h3{font-size:15px;margin-bottom:9px}.route-card p{font-size:12px;line-height:1.85;color:var(--muted)}.card-foot{margin-top:19px;font-size:10px;display:flex;justify-content:space-between;color:#73879a}.featured{display:grid;grid-template-columns:1fr 260px;gap:30px;border:1px solid var(--line);border-radius:10px;background:white;padding:28px 30px}.featured h3{font-size:24px;margin:12px 0}.featured p{font-size:13px;color:var(--muted);max-width:550px;margin-bottom:20px}.featured-aside{border-left:1px solid var(--line);padding-left:28px;display:flex;flex-direction:column;justify-content:center;gap:12px}.feature-point{display:flex;gap:10px;font-size:12px;color:#56718c}.feature-point span{color:#2f7d6b}.scope-note{font-size:11px;color:var(--muted);line-height:1.9;border-top:1px solid var(--line);padding-top:25px;margin-top:44px}.scope-note strong{color:var(--ink)}.breadcrumb{font-size:11px;color:var(--muted);display:flex;gap:11px;align-items:center;margin-bottom:26px;flex-wrap:wrap}.breadcrumb a:hover{color:var(--blue)}.page-heading{margin-bottom:32px}.page-heading h1{font-size:35px;line-height:1.55;margin-bottom:16px}.page-heading>p:not(.eyebrow){font-size:14px;line-height:2;color:var(--muted);max-width:720px}.page-heading .eyebrow{margin-bottom:14px}.intro-box{background:white;border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:7px;padding:18px 22px;margin-bottom:30px;font-size:12px;color:var(--muted)}.intro-box strong{color:var(--ink)}.timeline{position:relative;display:grid;gap:20px}.timeline:before{content:"";position:absolute;left:23px;top:24px;bottom:24px;width:1px;background:#cddcec}.era{display:grid;grid-template-columns:48px 1fr;gap:20px;position:relative}.era-marker{height:46px;width:46px;background:#e7eff9;border:5px solid var(--bg);border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:monospace;font-size:12px;color:var(--blue);font-weight:bold;z-index:1}.era-box{background:white;border:1px solid var(--line);border-radius:9px;overflow:hidden}.era-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 26px;border-bottom:1px solid #e9eef4}.era-heading h2{font-size:18px}.era-heading .era-kicker{font-size:10px;color:var(--blue);letter-spacing:.09em;display:block;margin-bottom:4px}.era-body{padding:22px 26px;display:grid;grid-template-columns:1fr 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var(--line);color:#4e657a}.article-toc{position:sticky;top:110px;padding-top:13px}.article-toc h2{font-size:10px;letter-spacing:.12em;color:#70879b;margin-bottom:15px}.article-toc a{display:block;border-left:2px solid var(--line);font-size:11px;color:var(--muted);line-height:1.7;padding:9px 0 9px 15px}.article-toc a[aria-current="location"]{color:var(--blue);border-color:var(--blue);font-weight:700}.article-toc a:hover{color:var(--blue)}.article-toc .toc-bottom{font-size:10px;color:#8394a4;margin-top:22px;line-height:1.8}.mobile-toc{display:none}.implementation{border:1px solid var(--line);background:white;border-radius:8px;margin:24px 0;overflow:hidden}.implementation summary{cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:17px 20px;font-size:12px;color:#476681;font-weight:700;list-style:none}.implementation summary:after{content:"＋";color:var(--blue);font-size:17px}.implementation[open] summary{border-bottom:1px solid var(--line)}.implementation[open] summary:after{content:"−"}.implementation summary::-webkit-details-marker{display:none}.implementation .details-body{padding:20px}.implementation .details-body p,.implementation .details-body li{font-size:12px;line-height:2}.implementation pre{background:#152e49;border-radius:6px;padding:18px;color:#dfebf9;overflow:auto;line-height:1.85;font-size:11px;margin:15px 0;tab-size:2}.inline-code{font-family:ui-monospace,Consolas,monospace;font-size:.86em;background:#edf1f6;padding:2px 4px;border-radius:3px;overflow-wrap:anywhere}.source-ref{font-size:10px!important;color:#6b8196!important;margin:10px 0 0!important;line-height:1.8!important}.source-ref a{text-decoration:underline;text-underline-offset:3px;color:#356ba5}.source-ref a:hover{color:var(--blue)}.step-list{counter-reset:steps;list-style:none;padding:0!important;margin:22px 0}.step-list li{counter-increment:steps;position:relative;padding:0 0 22px 46px!important;border-left:1px solid #cfdeef;margin:0 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button[aria-pressed="true"]{background:var(--blue);color:white;box-shadow:0 1px 3px #184a9230}.balance-example{padding:26px 22px 20px;display:grid;grid-template-columns:1fr 72px 1fr;align-items:center}.account-card{border:1px solid #dbe6f1;background:#f8fbff;border-radius:8px;padding:20px;text-align:center}.account-card small{font-size:11px;color:var(--muted);display:block;margin-bottom:8px}.account-card .balance{font-family:ui-sans-serif,system-ui,sans-serif;font-size:32px;font-weight:600;letter-spacing:-.03em;font-variant-numeric:tabular-nums}.account-card .balance-unit{font-size:12px;margin-left:5px}.account-card .delta{font-size:11px;color:var(--blue);min-height:22px;margin-top:7px;display:block}.transfer-arrow{text-align:center;color:var(--blue);font-size:20px}.transfer-arrow small{font-size:11px;display:block}.example-bottom{padding:0 22px 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var(--line);border-radius:7px;padding:20px}.old-new h3{font-size:14px;margin:11px 0}.old-new p{font-size:12px;line-height:1.95;margin:0}.old-new>div:last-child{border-color:#b4cfee;background:#f0f6ff}.sources{padding-left:20px!important;font-size:11px!important;line-height:1.9!important}.sources a{color:#2b659f;text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}.sources li+li{margin-top:13px}.read-complete{background:white;border:1px solid var(--line);border-radius:10px;padding:27px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:45px}.read-complete h2{font-size:16px;margin-bottom:5px}.read-complete p{font-size:11px;color:var(--muted);margin:0}.read-button[aria-pressed="true"]{background:#eaf5ef;border-color:#a5cab8;color:#2f765b}.next-reading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:25px;padding:18px 0;border-bottom:1px solid var(--line)}.next-reading small{display:block;font-size:10px;color:var(--muted);margin-bottom:3px}.next-reading strong{font-size:13px}.reading-bar{position:fixed;top:var(--header);left:var(--rail);right:0;height:3px;background:transparent;z-index:42;pointer-events:none}.reading-bar span{height:100%;background:var(--blue);display:block;width:0;transition:width .1s}.page-footer{font-size:10px;color:#7d90a3;display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:22px;border-top:1px solid var(--line)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.no-script-note{font-size:12px;background:#fff4d9;padding:12px 20px}.read-button{display:none}.js .read-button{display:inline-flex}.js-only{display:none}.js .js-only{display:revert}.table-scroll{overflow:auto}.article-navigation-note{font-size:11px;color:var(--muted);padding:12px 0}
@media(min-width:1550px){.page-inner{padding-top:56px}.hero{min-height:440px}}
@media(max-width:1240px){:root{--rail:215px}.page-inner{padding:34px 34px 56px}.hero{padding:32px 28px;gap:10px}.hero h1{font-size:32px}.hero .lead{font-size:12px}.hero-actions{gap:12px}.hero-actions .text-link{font-size:11px}.article-grid{grid-template-columns:minmax(0,1fr) 145px;gap:24px}.article-header h1{font-size:32px}.featured{grid-template-columns:1fr 210px}.featured-aside{padding-left:20px}.route-card{padding:19px}.flow{gap:14px}.flow-node:after{right:-13px}.flow-node strong{font-size:11px}.flow-node span{font-size:8px}.sidebar{padding-left:12px;padding-right:12px}}
@media(max-width:1020px){.hero{grid-template-columns:1fr}.hero-art{position:absolute;width:40%;right:15px;bottom:25px;opacity:.55}.hero-copy{max-width:100%}.hero h1{font-size:34px;max-width:450px}.hero .lead{max-width:390px}.hero-actions{position:relative;z-index:2}.hero{min-height:395px}.featured{grid-template-columns:1fr}.featured-aside{border:0;border-top:1px solid var(--line);padding:18px 0 0;gap:8px}.route-grid{gap:10px}.route-card{padding:17px}.route-card h3{font-size:13px}.route-card p{font-size:11px}.article-grid{display:block;max-width:760px;margin:auto}.article-toc{display:none}.mobile-toc{display:block;margin:25px 0}.mobile-toc summary{font-size:12px;color:var(--blue);padding:12px 16px;background:#edf4fe;cursor:pointer;border-radius:5px}.mobile-toc nav{background:white;padding:12px 17px;border:1px solid var(--line)}.mobile-toc a{display:block;font-size:12px;padding:6px;color:var(--muted)}.topic-grid{grid-template-columns:1fr 1fr}.era-body{gap:18px}}
@media(max-width:760px){:root{--header:65px;--rail:0px}.site-header{padding:0 19px}.brand{gap:9px}.brand-mark{width:28px;height:28px}.brand strong{font-size:14px}.brand small{font-size:8px}.top-meta{gap:12px}.top-meta .edition-text{display:none}.top-meta .pill{font-size:9px;padding:3px 6px}.menu-toggle{display:block;font-size:11px;padding:6px 10px;min-height:36px}.sidebar{width:260px;transform:translateX(-100%);transition:transform .2s;top:var(--header);padding:24px 16px;box-shadow:10px 0 30px #132c4f18}.menu-open .sidebar{transform:translateX(0)}.menu-open .backdrop{display:block;position:fixed;z-index:30;inset:var(--header) 0 0;background:#10294355}.page-inner{padding:27px 22px 42px}.hero{padding:30px 25px;min-height:0;display:block}.hero h1{font-size:30px;line-height:1.65;margin-bottom:17px}.hero .lead{font-size:13px;line-height:2}.hero-art{position:relative;width:100%;opacity:1;right:auto;bottom:auto;max-width:330px;margin:18px auto 0}.hero-art svg{max-height:225px;width:100%}.hero .eyebrow{font-size:9px;margin-bottom:17px}.hero-actions{margin-top:23px;gap:18px}.hero-actions .button-primary{font-size:12px}.hero-actions .text-link{font-size:12px}.art-caption{margin-top:0;font-size:9px}.hero-under{font-size:9px;gap:4px;padding-top:12px}.home-section{margin-top:32px}.section-heading{align-items:start;gap:15px}.section-heading h2{font-size:19px}.section-heading p{font-size:11px}.section-heading .small-label{display:none}.route-grid{grid-template-columns:1fr;gap:10px}.route-card{padding:18px 21px;display:grid;grid-template-columns:27px 1fr;gap:3px 15px}.route-card .num{grid-row:1/4;margin:3px 0 0}.route-card h3{font-size:14px;margin-bottom:3px}.route-card p{font-size:12px}.card-foot{grid-column:2;margin-top:8px}.featured{padding:23px;gap:23px}.featured h3{font-size:22px}.featured p{font-size:12px;margin-bottom:17px}.featured-aside{gap:9px}.scope-note{font-size:10px;margin-top:32px;padding-top:20px}.page-heading h1{font-size:29px}.page-heading>p:not(.eyebrow){font-size:13px}.breadcrumb{font-size:10px;margin-bottom:23px}.intro-box{padding:16px 18px}.era{grid-template-columns:34px 1fr;gap:10px}.era-marker{width:34px;height:34px;border-width:4px;font-size:10px}.timeline:before{left:16px}.era-heading{padding:17px 18px;gap:10px;align-items:start}.era-heading h2{font-size:15px}.era-heading .pill{font-size:8px;flex-shrink:0}.era-heading .era-kicker{font-size:9px}.era-body{grid-template-columns:1fr;padding:17px 18px;gap:18px}.era-body p{font-size:12px}.era-list li{font-size:11px}.era-link{padding:12px 18px;font-size:11px}.version-note{font-size:10px;margin-left:44px}.topic-grid{gap:9px}.topic-tile{padding:15px}.topic-tile strong{font-size:12px}.topic-tile p{font-size:10px}.article-header h1{font-size:29px;line-height:1.65}.article-header .dek{font-size:13px}.article-meta{font-size:9px;gap:10px;margin:18px 0 23px}.article-cover{padding:19px 16px;margin-bottom:23px}.flow{gap:14px;grid-template-columns:1fr 1fr}.flow-node{padding:12px 7px}.flow-node strong{font-size:12px}.flow-node span{font-size:9px}.flow-node:after{right:-13px;top:28px}.flow-node:nth-child(2):after{content:"↓";right:50%;top:auto;bottom:-18px;z-index:1;font-size:13px}.flow-node:nth-child(3){grid-column:2;grid-row:2}.flow-node:nth-child(3):after{content:"←";right:auto;left:-13px}.flow-node:last-child{grid-column:1;grid-row:2}.flow-caption{font-size:10px;line-height:1.9}.key-takeaway{padding:19px;margin:23px 0}.key-takeaway h2{font-size:13px}.key-takeaway ul{font-size:12px;line-height:2}.article-section{margin:27px 0;padding-top:12px}.article-section>h2{font-size:21px;margin-bottom:19px}.article-section p{font-size:13px;line-height:2.1}.article-section h3{font-size:16px}.article-section ul,.article-section ol{font-size:13px}.article-section .callout{padding:16px 18px}.callout p{font-size:12px}.check-grid{grid-template-columns:1fr}.check-item{padding:17px}.check-item p{font-size:12px}.implementation summary{font-size:11px;padding:15px 17px}.implementation .details-body{padding:16px}.implementation pre{font-size:10px;padding:14px}.example-top{padding:16px;flex-wrap:wrap;gap:12px}.balance-example{padding:20px 15px 15px;grid-template-columns:1fr 42px 1fr}.account-card{padding:16px 8px}.account-card .balance{font-size:27px}.account-card small{font-size:10px}.account-card .delta{font-size:10px}.transfer-arrow{font-size:17px}.transfer-arrow small{font-size:9px}.example-bottom{font-size:10px!important;padding:0 16px 16px!important}.ledger-table{font-size:10px;line-height:1.85}.ledger-table th,.ledger-table td{padding:10px 8px}.old-new{grid-template-columns:1fr}.old-new>div{padding:18px}.old-new p{font-size:12px}.read-complete{padding:22px;align-items:start;flex-direction:column;gap:18px}.read-complete .button-primary{width:100%}.page-footer{font-size:9px;gap:10px;flex-wrap:wrap;margin-top:32px}.next-reading strong{font-size:12px}.next-reading small{font-size:9px}.scope-note p{font-size:10px}.reading-bar{left:0}html{scroll-padding-top:92px}}
@media(max-width:370px){.site-header{padding:0 14px}.brand strong{font-size:12px}.brand small{font-size:7px}.brand-mark{width:25px}.top-meta .pill{display:none}.page-inner{padding-left:16px;padding-right:16px}.hero{padding:25px 21px}.hero h1{font-size:27px}.hero-actions{gap:13px}.hero-actions .button-primary{padding:10px 15px}.hero-actions .text-link{font-size:11px}.article-header h1{font-size:26px}.topic-grid{grid-template-columns:1fr}.example-top strong{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{.sidebar,.site-header,.article-toc,.mobile-toc,.reading-bar,.backdrop,.read-complete,.next-reading{display:none!important}.main{margin:0}.page-inner{padding:0}.article-grid{display:block}.article-main{max-width:none}.article-section{break-inside:avoid}.implementation{break-inside:avoid}.page-footer{margin-top:25px}.hero{break-inside:avoid}a{color:inherit}.hero-art{max-width:300px}.js-only{display:none!important}body{background:white;font-size:12px}.article-header h1{font-size:28px}}
@media (min-width:761px) and (max-width:1020px){.hero{min-height:0}.hero-art{position:relative;width:100%;max-width:350px;right:auto;bottom:auto;opacity:1;margin:18px auto 0}.hero-art svg{max-height:240px;width:100%}.hero-copy{max-width:none}}