:root{--tool-line:var(--line,color-mix(in srgb, var(--ink) 16%, transparent));--tool-mono:var(--mono,ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace)}.tool{border:1px solid var(--tool-line);background:var(--panel,transparent);margin:2rem 0 2.4rem;padding:1.2rem 1.2rem 1.4rem}.tool-head h2{margin:0 0 .4rem;font-size:clamp(1.05rem,2vw,1.3rem)}.tool-head p{color:var(--muted);margin:0 0 1rem;font-size:.86rem;line-height:1.7}.tool-calc{border-top:1px solid var(--tool-line);grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:1rem 1.6rem;padding:.9rem 0 1.1rem;display:grid}.tool-fields{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.8rem;display:grid}.tool-field{color:var(--muted);gap:.3rem;font-size:.78rem;display:grid}.tool-input{align-items:baseline;gap:.35rem;display:flex}.tool-input input{border:1px solid var(--tool-line);width:100%;min-width:0;color:var(--ink);font:inherit;font-family:var(--tool-mono);font-variant-numeric:tabular-nums;background:0 0;padding:.4rem .5rem;font-size:.95rem}.tool-input input:focus{outline:2px solid var(--accent);outline-offset:1px}.tool-input em{color:var(--muted);font-size:.75rem;font-style:normal}.tool-out{justify-items:end;line-height:1;display:grid}.tool-out-v{font-family:var(--tool-mono);font-variant-numeric:tabular-nums;letter-spacing:-.02em;font-size:clamp(2rem,4.5vw,2.8rem)}.tool-out-u{color:var(--muted);margin-top:.3rem;font-size:.75rem}.tool-outlabel{color:var(--muted);text-align:right;grid-column:2;margin:.35rem 0 0;font-size:.72rem}.tool-table{border-collapse:collapse;width:100%;font-size:.88rem}.tool-table caption{letter-spacing:.1em;color:var(--muted);text-align:left;padding-bottom:.5rem;font-size:.72rem}.tool-table th{border-bottom:1px solid var(--ink);letter-spacing:.06em;color:var(--muted);text-align:left;padding:.45rem .6rem .45rem 0;font-size:.72rem;font-weight:500}.tool-table .tool-num,.tool-num{font-family:var(--tool-mono);font-variant-numeric:tabular-nums;text-align:right}.tool-out-cell{font-family:var(--tool-mono);font-variant-numeric:tabular-nums;font-weight:600}.tool-bar{border-top:1px solid var(--tool-line);border-bottom:1px solid var(--tool-line);justify-content:space-between;align-items:center;gap:1rem;padding:.8rem 0;display:flex}.tool-search{color:var(--muted);align-items:center;gap:.6rem;font-size:.78rem;display:flex}.tool-search input{border:1px solid var(--tool-line);width:min(52vw,240px);color:var(--ink);font:inherit;background:0 0;padding:.4rem .55rem}.tool-search input:focus{outline:2px solid var(--accent);outline-offset:1px}.tool-count{font-family:var(--tool-mono);color:var(--muted);margin:0;font-size:.78rem}@media (width<=700px){.tool-calc{grid-template-columns:1fr}.tool-out{justify-items:start}.tool-outlabel{text-align:left;grid-column:1}.tool-table [data-hide=mobile]{display:none}.tool-bar{flex-wrap:wrap}.tool-search input{width:100%}}.eng-kicker,.eng-toc-h,.eng-st-no,.eng-b-h,.eng-hc-meta{font:600 .7rem/1.4 var(--mono,ui-monospace, SFMono-Regular, Menlo, monospace);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0}.eng-lead{color:var(--muted);max-width:46ch;margin:0;font-size:clamp(1rem,1.5vw,1.08rem);line-height:1.95}.eng-hero-split{padding:clamp(2.5rem,6vw,4.5rem) 0 clamp(1.5rem,3vw,2.2rem)}.eng-hs-grid{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);align-items:start;gap:clamp(1.6rem,4vw,3.4rem);display:grid}.eng-hs-main{align-content:start;gap:1.1rem;display:grid}.eng-hs-main h1{letter-spacing:-.02em;margin:0;font-size:clamp(1.9rem,4.4vw,3.15rem);line-height:1.18}.eng-hs-facts{border-top:1px solid var(--line,#00000029);gap:0;margin:0;display:grid}.eng-hs-facts>div{border-bottom:1px solid var(--line,#00000029);gap:.15rem;padding:.7rem 0;display:grid}.eng-hs-facts dt{letter-spacing:.08em;color:var(--muted);font-size:.72rem}.eng-hs-facts dd{margin:0;font-size:.95rem;font-weight:600;line-height:1.5}.eng-hero-center{text-align:center;padding:clamp(3rem,8vw,6rem) 0 clamp(2rem,4vw,3rem)}.eng-hc-inner{justify-items:center;gap:1.1rem;display:grid}.eng-hc-inner h1{letter-spacing:-.02em;max-width:22ch;margin:0;font-size:clamp(1.85rem,4.6vw,3.2rem);line-height:1.16}.eng-hc-inner .eng-lead{max-width:40ch}.eng-hc-meta{color:var(--muted)}.eng-hero-band{background:var(--hero-bg,var(--ink));color:var(--hero-ink,var(--ground));margin-bottom:clamp(1.6rem,3vw,2.4rem);padding:clamp(2.6rem,6vw,4.6rem) 0}.eng-hb-inner{gap:1.1rem;display:grid}.eng-hero-band .eng-kicker{color:color-mix(in srgb, currentColor 62%, transparent)}.eng-hero-band h1{letter-spacing:-.02em;max-width:24ch;margin:0;font-size:clamp(1.9rem,4.6vw,3.3rem);line-height:1.14}.eng-hero-band .eng-lead{color:color-mix(in srgb, currentColor 76%, transparent)}.eng-hb-facts{flex-wrap:wrap;gap:.4rem 1.6rem;margin:.4rem 0 0;padding:0;font-size:.86rem;list-style:none;display:flex}.eng-hb-facts li{align-items:baseline;gap:.45rem;min-width:0;display:flex}.eng-hb-facts span{color:color-mix(in srgb, currentColor 58%, transparent);letter-spacing:.08em;white-space:nowrap;font-size:.72rem}.eng-flow{grid-template-columns:minmax(0,1fr);gap:clamp(1.6rem,4vw,3rem);padding-bottom:clamp(1.6rem,4vw,2.6rem);display:grid}.eng-flow-toc{grid-template-columns:minmax(0,1fr) 15rem}.eng-flow-main{align-content:start;gap:clamp(1.4rem,3vw,2.2rem);display:grid}.eng-toc{align-self:start;gap:.5rem;display:grid;position:sticky;top:5.5rem}.eng-toc ol{gap:.4rem;margin:0;padding:0;font-size:.86rem;list-style:none;display:grid}.eng-toc a{color:var(--muted);border-bottom:1px solid #0000;text-decoration:none}.eng-toc a:hover{color:var(--accent);border-bottom-color:var(--accent)}.eng-toc-inline{border-top:1px solid var(--line,#00000029);border-bottom:1px solid var(--line,#00000029);flex-wrap:wrap;gap:.4rem 1.1rem;padding:.9rem 0;font-size:.82rem;display:flex}.eng-toc-inline a:hover{color:var(--accent)}.eng-b{margin:0}.eng-b-h{justify-content:space-between;gap:1rem;margin-bottom:.7rem;display:flex}.eng-idx-grid>.eng-b-h,.eng-idx-cards>.eng-b-h,.eng-board>.eng-b-h{grid-column:1/-1;margin-bottom:.2rem}.eng-kpi-row{border-top:1px solid var(--line,#00000029);grid-template-columns:repeat(auto-fit,minmax(9rem,1fr));display:grid}.eng-kpi{border-bottom:1px solid var(--line,#00000029);border-right:1px solid var(--line,#00000029);align-content:start;gap:.3rem;padding:.9rem 1rem 1rem 0;display:grid}.eng-kpi:last-child{border-right:0}.eng-kpi-k{letter-spacing:.06em;color:var(--muted);font-size:.7rem}.eng-kpi b{overflow-wrap:anywhere;font-size:clamp(.95rem,1.5vw,1.15rem);line-height:1.45}.eng-kpi-stack{gap:0;margin:0;display:grid}.eng-kpi-stack>div{border-bottom:1px solid var(--line,#00000029);grid-template-columns:8rem minmax(0,1fr);gap:1rem;padding:.55rem 0;display:grid}.eng-kpi-stack dt{letter-spacing:.06em;color:var(--muted);font-size:.72rem}.eng-kpi-stack dd{margin:0;font-size:.92rem}.eng-idx-table ol{border-top:1px solid var(--line,#00000029);margin:0;padding:0;list-style:none}.eng-idx-table li a{border-bottom:1px solid var(--line,#00000029);color:var(--ink);grid-template-columns:3rem minmax(0,14rem) minmax(0,1fr) 4.5rem;align-items:baseline;gap:1rem;padding:.75rem 0;text-decoration:none;display:grid}.eng-it-no{font-family:var(--mono,monospace);color:var(--accent-ink,var(--accent));font-size:.72rem}.eng-it-title{font-weight:600}.eng-it-lead{color:var(--muted);font-size:.86rem;line-height:1.7}.eng-it-n{font-family:var(--mono,monospace);color:var(--muted);text-align:right;font-size:.72rem}.eng-idx-grid{border-top:1px solid var(--line,#00000029);grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:0;display:grid}.eng-idx-grid a{border-bottom:1px solid var(--line,#00000029);border-right:1px solid var(--line,#00000029);color:var(--ink);gap:.35rem;padding:1rem 1.2rem 1.2rem 0;text-decoration:none;display:grid}.eng-idx-grid a:nth-child(2n){border-right:0;padding-left:1.2rem}.eng-ig-no{font-family:var(--mono,monospace);color:var(--accent-ink,var(--accent));font-size:.7rem}.eng-idx-grid b{font-size:1rem}.eng-idx-grid span:last-child{color:var(--muted);font-size:.85rem;line-height:1.7}.eng-idx-list{margin:0;padding:0;list-style:none}.eng-idx-list a{color:var(--ink);align-items:baseline;gap:.6rem;padding:.7rem 0;font-size:.94rem;text-decoration:none;display:flex}.eng-il-n{font-family:var(--mono,monospace);color:var(--muted);font-size:.72rem}.eng-idx-cards{grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:1rem;display:grid}.eng-idx-cards a{background:var(--panel,#0000000a);border-radius:var(--eng-radius,0);color:var(--ink);gap:.4rem;padding:1.1rem;text-decoration:none;display:grid}.eng-ic-no{font-family:var(--mono,monospace);color:var(--accent-ink,var(--accent));font-size:.7rem}.eng-idx-cards b{font-size:1rem}.eng-idx-cards span:last-child{color:var(--muted);font-size:.85rem;line-height:1.7}.eng-steps{counter-reset:st;gap:0;margin:0;padding:0;list-style:none;display:grid}.eng-steps li{border-top:1px solid var(--line,#00000029);grid-template-columns:6rem minmax(0,1fr) auto;gap:.35rem 1.2rem;padding:1rem 0;display:grid}.eng-steps b{grid-column:2;font-size:1rem}.eng-steps span{color:var(--muted);grid-column:2;font-size:.86rem;line-height:1.7}.eng-steps a{color:var(--accent);grid-area:1/3/span 3;align-self:center;font-size:.8rem;text-decoration:none}.eng-facts-dl{grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));gap:0 2rem;margin:0;display:grid}.eng-facts-dl>div{border-bottom:1px solid var(--line,#00000029);padding:.6rem 0}.eng-facts-dl dt{letter-spacing:.06em;color:var(--muted);font-size:.72rem}.eng-facts-dl dd{margin:.15rem 0 0;font-size:.92rem}.eng-facts-chips{flex-wrap:wrap;gap:.5rem;margin:0;padding:0;list-style:none;display:flex}.eng-facts-chips li{border:1px solid var(--line,#00000029);border-radius:var(--eng-radius,0);align-items:baseline;gap:.45rem;padding:.4rem .7rem;font-size:.84rem;display:flex}.eng-facts-chips span{letter-spacing:.06em;color:var(--muted);font-size:.68rem}.eng-board{border:1px solid var(--ink);grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:0;display:grid}.eng-board a{border-right:1px solid var(--line,#00000029);border-bottom:1px solid var(--line,#00000029);color:var(--ink);gap:.35rem;padding:1rem 1.1rem 1.2rem;text-decoration:none;display:grid}.eng-bd-no{font-family:var(--mono,monospace);color:var(--accent-ink,var(--accent));font-size:.7rem}.eng-board b{font-size:.98rem}.eng-board span:last-child{color:var(--muted);font-size:.84rem;line-height:1.7}.eng-quote{border-left:3px solid var(--accent);margin:0;padding:1.4rem 0 1.4rem 1.4rem}.eng-quote p{margin:0;font-size:clamp(1.05rem,2vw,1.3rem);line-height:1.85}.eng-sec{border-top:1px solid var(--line,#00000029);padding:clamp(1.4rem,3vw,2.2rem) 0}.eng-sec h2{align-items:baseline;gap:.8rem;margin:0 0 .9rem;font-size:clamp(1.1rem,2vw,1.35rem);display:flex}.eng-sec-no{font-family:var(--mono,monospace);color:var(--accent-ink,var(--accent));letter-spacing:.08em;font-size:.72rem}.eng-art{padding-bottom:clamp(2.5rem,6vw,4.5rem)}.eng-art-head{gap:.9rem;padding:clamp(1.6rem,4vw,2.8rem) 0 clamp(1.2rem,3vw,1.8rem);display:grid}.eng-art-head h1{letter-spacing:-.02em;margin:0;font-size:clamp(1.7rem,3.8vw,2.6rem);line-height:1.2}.eng-art-body{max-width:74ch}.eng-art-rail:has(>.eng-toc){grid-template-columns:15rem minmax(0,1fr);align-items:start;gap:clamp(1.6rem,4vw,3rem);display:grid}.eng-art-rail .eng-art-body{max-width:none}.eng-art-numbered .prose section{grid-template-columns:4rem minmax(0,1fr);gap:1rem;display:grid}.eng-art-numbered .prose h2,.eng-art-numbered .prose section>:not(h2){grid-column:2}.eng-cards{grid-template-columns:minmax(0,1fr);gap:1rem;display:grid}.eng-cards>*,.eng-flow-main>*{min-width:0}.eng-cards section{border:1px solid var(--line,#00000029);border-radius:var(--eng-radius,0);padding:1.2rem 1.3rem}.eng-cards h2{margin-top:0}.eng-next ul{gap:.4rem;margin:.6rem 0 0;padding:0;list-style:none;display:grid}.eng-next a{color:var(--muted);font-size:.9rem;text-decoration:none}.eng-next a:hover{color:var(--accent)}@media (width<=900px){.eng-hs-grid,.eng-flow-toc{grid-template-columns:minmax(0,1fr)}.eng-toc{order:2;position:static}.eng-art-rail,.eng-art-rail:has(>.eng-toc){grid-template-columns:minmax(0,1fr)}.eng-art-rail .eng-toc{order:2}.eng-idx-table li a{grid-template-columns:2.2rem minmax(0,1fr)}.eng-it-lead,.eng-it-n{grid-column:2}.eng-it-n{text-align:left}.eng-kpi-stack>div{grid-template-columns:minmax(0,1fr);gap:.15rem}.eng-steps li{grid-template-columns:5rem minmax(0,1fr)}.eng-steps a{grid-area:auto/2}.eng-art-numbered .prose section{grid-template-columns:minmax(0,1fr)}.eng-art-numbered .prose h2,.eng-art-numbered .prose section>:not(h2){grid-column:1}}[hidden]{display:none!important}h1,h2,h3{word-break:keep-all;line-break:strict}.footer-name{font-size:1.05rem;line-height:1.5}.eng-hero-band .eng-lead,.eng-hero-center .eng-lead,.eng-hero-split .eng-lead{max-width:44rem}.eng-art .prose .tablewrap{max-width:min(100%,96rem)}td,th{word-break:keep-all}.tool-table{display:block;overflow-x:auto}@media (width<=620px){.masthead-inner{flex-wrap:wrap;row-gap:.5rem}}:root{--ground:#fff;--panel:#f7f7f7;--panel-2:#efefef;--ink:#111;--muted:#777;--accent:#111;--accent-fill:#111;--on-accent:#fff;--rule:#111;--line:#e5e5e5;--maxw:74rem;--font:"Helvetica Neue", Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", Meiryo, system-ui, -apple-system, sans-serif;--mono:ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}body{background:var(--ground);color:var(--ink);font-family:var(--font);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;margin:0;font-size:1.0625rem;line-height:1.9}::selection{background:var(--ink);color:#fff}a{color:inherit;text-underline-offset:3px;text-decoration-thickness:1px}a:hover{text-decoration-thickness:2px}:focus-visible{outline:3px solid var(--ink);outline-offset:3px}img{max-width:100%;height:auto}.wrap{width:min(100% - 2.5rem, var(--maxw));margin-inline:auto}.skip{position:absolute;left:-9999px}.skip:focus{z-index:20;background:var(--ink);color:#fff;padding:.6rem 1rem;text-decoration:none;top:1rem;left:1rem}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.masthead{z-index:10;background:var(--ground);border-bottom:3px solid var(--rule);position:sticky;top:0}.masthead-inner{align-items:center;gap:1.5rem;padding-block:.85rem;display:flex}.wordmark{align-items:center;gap:.55rem;min-width:0;margin-right:auto;text-decoration:none;display:inline-flex}.wordmark-mark{background:var(--ink);color:#fff;font-family:var(--mono);letter-spacing:.06em;place-items:center;padding:.4rem .42rem;font-size:.75rem;font-weight:700;line-height:1;display:inline-grid}.wordmark-text{letter-spacing:-.01em;white-space:nowrap;text-overflow:ellipsis;font-size:.95rem;font-weight:800;overflow:hidden}.nav{letter-spacing:.08em;text-transform:uppercase;scrollbar-width:none;gap:1.3rem;font-size:.8rem;font-weight:700;display:flex;overflow-x:auto}.nav::-webkit-scrollbar{display:none}.nav a{color:var(--muted);white-space:nowrap;border-bottom:2px solid #0000;padding-block:.45rem;text-decoration:none}.nav a:hover,.nav a[aria-current=page]{color:var(--ink);border-bottom-color:var(--ink)}.lang select{border:1px solid var(--rule);background:var(--ground);color:var(--ink);border-radius:0;padding:.3rem .4rem;font-family:inherit;font-size:.8rem}.article{padding-block:2.5rem 4rem}.crumbs{font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);align-items:center;gap:.5rem;margin-bottom:1.6rem;font-size:.72rem;display:flex}.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--ink)}.article-head,.eng-art-head{border-top:6px solid var(--rule);margin-bottom:2.2rem;padding-top:1.4rem}.article-head h1,.eng-art-head h1{letter-spacing:-.035em;margin:0 0 1rem;font-size:clamp(2.1rem,5.2vw,3.6rem);font-weight:800;line-height:1.06}.article-lead,.eng-lead{color:var(--ink);max-width:46em;margin:0;font-size:clamp(1.02rem,1.6vw,1.18rem);line-height:1.8}.page-meta{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:1.2rem 0 0;font-size:.72rem}.prose{max-width:46em}.prose section{border-top:3px solid var(--rule);padding-block:1.8rem}.prose section:first-child{border-top:0;padding-top:0}.prose h2{letter-spacing:-.025em;align-items:baseline;gap:.6rem;margin:0 0 1.1rem;font-size:clamp(1.35rem,2.6vw,1.75rem);font-weight:800;line-height:1.25;display:flex}.prose h3{letter-spacing:-.01em;margin:1.8rem 0 .6rem;font-size:1.1rem}.prose p{margin:0 0 1.1rem}.prose p:last-child{margin-bottom:0}.prose a{text-decoration:underline}.prose strong{font-weight:800}.prose code{font-family:var(--mono);background:var(--panel);padding:.1em .35em;font-size:.9em}.bullets{margin:0 0 1.1rem;padding-left:1.15rem}.bullets li{margin-bottom:.55rem;padding-left:.15rem}.bullets li::marker{color:var(--ink)}.kv{margin:0}.kv-row{border-top:1px solid var(--line);grid-template-columns:minmax(9rem,15rem) minmax(0,1fr);gap:.4rem 1.4rem;padding-block:.7rem;display:grid}.kv-row:first-child{border-top:0}.kv dt{letter-spacing:-.01em;font-size:.95rem;font-weight:800}.kv dd{color:var(--ink);margin:0;font-size:.98rem}.tablewrap{margin:1.4rem 0 1.8rem;overflow-x:auto}.datatable{border-collapse:collapse;border-top:3px solid var(--rule);border-bottom:3px solid var(--rule);width:100%;font-size:.94rem}.datatable caption{caption-side:top;text-align:left;font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding-bottom:.6rem;font-size:.72rem}.datatable th{text-align:left;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border-bottom:3px solid var(--rule);vertical-align:bottom;padding:.7rem .9rem .7rem 0;font-size:.72rem;font-weight:700}.datatable td{border-bottom:1px solid var(--line);vertical-align:top;padding:.75rem .9rem .75rem 0}.datatable tr:last-child td{border-bottom:0}.linklist{border-top:3px solid var(--rule);margin:0;padding:0;list-style:none}.linklist li{border-bottom:1px solid var(--line)}.linklist a{padding:.9rem 0;text-decoration:none;display:block}.linklist a:hover .link-label{text-decoration:underline 2px}.link-label{margin-right:.6rem;font-weight:800;display:inline-block}.link-tag{font-family:var(--mono);letter-spacing:.08em;border:1px solid var(--ink);vertical-align:.1em;margin-right:.6rem;padding:.05rem .35rem;font-size:.66rem;display:inline-block}.link-note{color:var(--muted);margin-top:.25rem;font-size:.86rem;line-height:1.7;display:block}.filter{margin:0 0 2rem}.filter input{background:var(--ground);border:2px solid var(--rule);width:min(100%,30rem);color:var(--ink);border-radius:0;padding:.7rem .9rem;font-family:inherit;font-size:1rem}.filter input::placeholder{color:var(--muted)}.filter input:focus{outline:3px solid var(--ink);outline-offset:2px}.filter-count{font-family:var(--mono);letter-spacing:.06em;color:var(--muted);margin-top:.5rem;font-size:.72rem;display:block}.footer{border-top:3px solid var(--rule);margin-top:5rem;padding-block:2rem 3rem}.footer-name{letter-spacing:-.02em;margin:0 0 .8rem;font-weight:800}.footer-nav{flex-wrap:wrap;gap:.6rem 1.3rem;margin-bottom:1.2rem;font-size:.85rem;font-weight:700;display:flex}.footer-nav a{border-bottom:1px solid var(--line);padding-bottom:.1rem;text-decoration:none}.footer-nav a:hover{border-bottom-color:var(--ink)}.footer-note{color:var(--muted);max-width:46em;margin:.35rem 0 0;font-size:.78rem;line-height:1.75}.eng-kicker{font-family:var(--mono);letter-spacing:.2em;text-transform:uppercase;font-size:.72rem;font-weight:700}.eng-hero-band{background:var(--ink);color:#fff;border-bottom:0;margin-bottom:0;padding:clamp(3rem,8vw,6.5rem) 0 clamp(2.2rem,5vw,3.4rem)}.eng-hero-band .eng-kicker{color:#fff;opacity:.72;margin:0 0 1.2rem}.eng-hero-band h1{letter-spacing:-.045em;text-wrap:balance;max-width:24ch;margin:0;font-size:clamp(2.2rem,5.4vw,5rem);font-weight:800;line-height:1}.eng-hero-band .eng-lead{color:#fff;opacity:.86;max-width:44em;margin-top:1.6rem;font-size:clamp(.98rem,1.5vw,1.1rem)}.eng-hb-facts{border-top:1px solid #ffffff59;grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:0;margin:2.6rem 0 0;padding:0;list-style:none;display:grid}.eng-hb-facts li{border-bottom:1px solid #fff3;padding:.85rem 1.2rem .85rem 0;font-size:.92rem;line-height:1.6}.eng-hb-facts li span{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;opacity:.65;margin-bottom:.15rem;font-size:.66rem;display:block}.eng-flow{padding-block:2.6rem 0}.eng-b{margin-bottom:2.2rem}.eng-quote{border:0;border-top:3px solid var(--rule);border-bottom:3px solid var(--rule);margin:2.4rem 0;padding:1.6rem 0 1.7rem}.eng-quote p{letter-spacing:-.02em;max-width:40em;margin:0;font-size:clamp(1.18rem,2.6vw,1.6rem);font-weight:700;line-height:1.6}.eng-facts-chips,.eng-facts-dl{border-top:3px solid var(--rule)}.eng-facts-chips{grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:0;display:grid}.eng-facts-chips li{border:0;border-bottom:1px solid var(--line);border-radius:0;flex-direction:column;align-items:flex-start;gap:.15rem;padding:.85rem 1.2rem .85rem 0;display:flex}.eng-facts-chips li span{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0;font-size:.68rem}.eng-facts-chips li b,.eng-facts-chips li strong{font-size:.98rem;line-height:1.6}.eng-facts-dl div{border-bottom:1px solid var(--line);padding:.65rem 0}.eng-facts-dl dt{font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-size:.7rem}.eng-facts-dl dd{margin:0;font-weight:700}.eng-idx-list{border-top:3px solid var(--rule)}.eng-idx-list li{border-bottom:1px solid var(--line)}.eng-idx-list a{align-items:baseline;gap:.6rem;padding:.85rem 0;font-weight:700;text-decoration:none;display:flex}.eng-idx-list a:hover{border-left:3px solid var(--ink);padding-left:.4rem}.eng-il-dots{border-bottom:1px dotted #bbb;flex:1;transform:translateY(-.28em)}.eng-il-n{font-family:var(--mono);color:var(--muted);font-size:.75rem;font-weight:400}.eng-sec{border-top:3px solid var(--rule);padding-block:2rem 1rem}.eng-sec h2{letter-spacing:-.03em;align-items:baseline;gap:.7rem;margin:0 0 1.2rem;font-size:clamp(1.4rem,2.8vw,1.9rem);font-weight:800;line-height:1.25;display:flex}.eng-sec-no{background:var(--ink);color:#fff;font-family:var(--mono);letter-spacing:.04em;flex:none;place-items:center;padding:.38rem .4rem;font-size:.74rem;font-weight:700;line-height:1;display:inline-grid;transform:translateY(-.16em)}.eng-sec-body{max-width:46em}.eng-art-body{padding-block:2.2rem 3rem}.eng-art-body .eng-sec-no{background:var(--ink)}.eng-art-head .eng-sec-no,.prose h2 .eng-sec-no{color:#fff}.eng-art-body .tool,.eng-art-rail .tool{margin-top:2.6rem}.eng-next{border-top:3px solid var(--rule);margin-top:3.4rem;padding-top:1.2rem}.eng-toc-h{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 .8rem;font-size:.72rem}.eng-next ul{margin:0;padding:0;list-style:none}.eng-next li{border-bottom:1px solid var(--line)}.eng-next a{padding:.6rem 0;font-size:.95rem;font-weight:700;text-decoration:none;display:block}.eng-next a:hover{text-decoration:underline 2px}.eng-toc-inline{border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-family:var(--mono);letter-spacing:.04em;flex-wrap:wrap;gap:.5rem 1.2rem;margin-bottom:2rem;padding-block:.9rem;font-size:.75rem;display:flex}.eng-toc-inline a{color:var(--muted);text-decoration:none}.eng-toc-inline a:hover{color:var(--ink);text-decoration:underline}.tool{border:2px solid var(--rule);background:var(--ground);border-radius:0;padding:1.3rem 1.3rem 1.5rem}.tool-head h2{letter-spacing:-.02em;font-size:clamp(1.15rem,2.4vw,1.4rem);font-weight:800}.tool-head p{color:var(--muted);max-width:44em}.tool-field span:first-child{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-size:.7rem}.tool-input input{border:2px solid var(--rule);background:var(--ground);color:var(--ink);font-family:var(--mono);border-radius:0;padding:.45rem .5rem}.tool-calc{border-top:2px solid var(--rule)}.tool-out{border:2px solid var(--rule);border-radius:0}.ladder-fields{border-top:2px solid var(--rule);border-bottom:2px solid var(--rule);grid-template-columns:repeat(auto-fit,minmax(120px,1fr));padding-block:1rem}.ladder-out{grid-template-columns:repeat(auto-fit,minmax(17rem,1fr));gap:1.2rem;margin:1.2rem 0 1.6rem;display:grid}.ladder-card{border-top:3px solid var(--rule);padding-top:.8rem}.ladder-k{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 .3rem;font-size:.7rem}.ladder-v{align-items:baseline;gap:.3rem;margin:0;display:flex}.ladder-v b{letter-spacing:-.04em;font-size:clamp(2.4rem,6vw,3.4rem);font-weight:800;line-height:1}.ladder-v span{color:var(--muted);font-size:.9rem}.ladder-steps{font-family:var(--mono);color:var(--muted);margin:.6rem 0 0;font-size:.72rem;line-height:1.8}.tool-scroll{overflow-x:auto}.tool-table{border-collapse:collapse;border-top:2px solid var(--rule);border-bottom:2px solid var(--rule);width:100%;min-width:26rem;font-size:.88rem}.tool-table caption{caption-side:top;text-align:left;font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding-bottom:.55rem;font-size:.7rem}.tool-table th{text-align:left;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border-bottom:2px solid var(--rule);padding:.55rem .7rem .55rem 0;font-size:.68rem;font-weight:700}.tool-table td{border-bottom:1px solid var(--line);vertical-align:top;padding:.55rem .7rem .55rem 0}.tool-table tr:last-child td{border-bottom:0}.tool-num{font-family:var(--mono);font-variant-numeric:tabular-nums;white-space:nowrap}.ladder-note{color:var(--ink);border-left:3px solid var(--rule);margin:1.2rem 0;padding-left:.8rem;font-size:.9rem}.ladder-ref{border-top:1px solid var(--line);margin:1.2rem 0 0;padding:0;font-size:.85rem;list-style:none}.ladder-ref li{border-bottom:1px solid var(--line);color:var(--muted);padding:.45rem 0}.ladder-ref b{color:var(--ink)}.unlock-bar{border-top:2px solid var(--rule);border-bottom:2px solid var(--rule);flex-wrap:wrap;justify-content:space-between;align-items:end;gap:1rem;padding-block:1rem;display:flex}.unlock-sum{font-family:var(--mono);letter-spacing:.04em;color:var(--muted);margin:0;font-size:.8rem}.unlock-sum b{color:var(--ink);font-size:1.1rem}.unlock-list{margin:0;padding:0;list-style:none}.unlock-list li{border-bottom:1px solid var(--line);grid-template-columns:4.2rem minmax(7rem,11rem) minmax(0,1fr) auto;align-items:baseline;gap:.4rem 1rem;padding:.55rem 0;font-size:.92rem;display:grid}.unlock-list li[data-on="0"]{color:var(--muted)}.unlock-lv{font-family:var(--mono);letter-spacing:.06em;color:var(--muted);font-size:.72rem}.unlock-name{font-weight:800}.unlock-note{color:var(--muted);font-size:.85rem}.unlock-state{font-family:var(--mono);letter-spacing:.04em;white-space:nowrap;font-size:.7rem}.unlock-list li[data-on="1"] .unlock-state{background:var(--ink);color:#fff;padding:.1rem .35rem}.unlock-next{margin:1rem 0 0;font-size:.92rem;font-weight:700}.unlock-note2{color:var(--muted);margin:.5rem 0 0;font-size:.8rem;line-height:1.75}@media (width<=720px){body{font-size:1rem;line-height:1.85}.masthead-inner{flex-wrap:wrap;gap:.5rem 1rem}.nav{order:3;gap:1rem;width:100%}.eng-hero-band{padding-block:2.6rem 2rem}.eng-hero-band h1{font-size:clamp(2.2rem,11vw,3.2rem)}.kv-row{grid-template-columns:1fr;gap:.15rem}.unlock-list li{grid-template-columns:3.4rem minmax(0,1fr) auto}.unlock-note,.tool-table .col-screen{display:none}.tool-table{min-width:0;font-size:.82rem}.tool-table th,.tool-table td{padding-right:.5rem}.datatable{font-size:.86rem}.datatable th,.datatable td{padding-right:.6rem}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}