@font-face{font-family:IBM Plex Sans;src:url(fonts/plex-sans-var-latin.woff2) format("woff2-variations"),url(fonts/plex-sans-var-latin.woff2) format("woff2");font-weight:300 700;font-stretch:85% 100%;font-style:normal;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:IBM Plex Mono;src:url(fonts/plex-mono-400-latin.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--scheme: light;color-scheme:light;--background: oklch(.972 .0045 60);--card: oklch(.988 .003 60);--foreground: oklch(.25 .03 258);--muted: oklch(.938 .006 60);--muted-foreground: oklch(.44 .03 258);--primary: oklch(.47 .14 258);--primary-foreground: oklch(.99 .004 240);--border: oklch(.25 .03 258 / .16);--input: oklch(.56 .03 258);--ring: oklch(.47 .14 258);--line: oklch(.25 .03 258);--line-thin: oklch(.25 .03 258 / .5);--dim: oklch(.47 .14 258);--rev: oklch(.52 .18 25);--danger: oklch(.48 .17 25);--frame-line: oklch(.25 .03 258 / .55);--vellum: oklch(.882 .026 242);--vellum-ink: oklch(.42 .13 258);--drop: oklch(.895 .04 252)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--scheme: dark;color-scheme:dark;--background: oklch(.27 .075 258);--card: oklch(.3 .08 258);--foreground: oklch(.96 .012 240);--muted: oklch(.3 .078 258);--muted-foreground: oklch(.84 .035 240);--primary: oklch(.86 .08 225);--primary-foreground: oklch(.24 .07 258);--border: oklch(.96 .012 240 / .2);--input: oklch(.72 .04 240);--ring: oklch(.86 .08 225);--line: oklch(.96 .012 240);--line-thin: oklch(.96 .012 240 / .55);--dim: oklch(.86 .08 225);--rev: oklch(.76 .14 30);--danger: oklch(.8 .12 30);--frame-line: oklch(.96 .012 240 / .5);--vellum: oklch(.225 .068 260);--vellum-ink: oklch(.86 .08 225);--drop: oklch(.33 .085 255)}}:root[data-theme=dark]{--scheme: dark;color-scheme:dark;--background: oklch(.27 .075 258);--card: oklch(.3 .08 258);--foreground: oklch(.96 .012 240);--muted: oklch(.3 .078 258);--muted-foreground: oklch(.84 .035 240);--primary: oklch(.86 .08 225);--primary-foreground: oklch(.24 .07 258);--border: oklch(.96 .012 240 / .2);--input: oklch(.72 .04 240);--ring: oklch(.86 .08 225);--line: oklch(.96 .012 240);--line-thin: oklch(.96 .012 240 / .55);--dim: oklch(.86 .08 225);--rev: oklch(.76 .14 30);--danger: oklch(.8 .12 30);--frame-line: oklch(.96 .012 240 / .5);--vellum: oklch(.225 .068 260);--vellum-ink: oklch(.86 .08 225);--drop: oklch(.33 .085 255)}:root{--primary-hover: oklch(from var(--primary) calc(l - .06) c h);--primary-soft: color-mix(in oklch, var(--primary) 12%, var(--card))}@supports not (color: oklch(from red l c h)){:root{--primary-hover: var(--primary)}}:root{--font-sans: "IBM Plex Sans", system-ui, 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.15s}}:root:lang(zh-Hant){text-autospace:normal;line-break:strict;font-synthesis-style:none}[lang|=zh]{font-family:var(--font-zh);text-autospace:normal;line-break:strict;font-synthesis-style:none}h1,h2,h3{text-wrap:balance}pre,code,kbd,samp,.mono,.num,.d,.op-no{font-variant-ligatures:none;text-spacing-trim:space-all;text-autospace:no-autospace}*,*:before,*:after{box-sizing:border-box}html{background:var(--background);scroll-padding-top:calc(var(--header-h) + 16px);-webkit-text-size-adjust:100%}@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}body{margin:0;background:var(--background);color:var(--foreground);font-family:var(--font-sans);font-size:var(--fs-2);line-height:1.6;font-stretch:100%;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}h1,h2,h3{margin:0;font-stretch:85%;font-weight:600;line-height:1.12;letter-spacing:-.01em}p{margin:0;text-wrap:pretty}ul,ol{margin:0;padding:0;list-style:none}a{color:inherit;text-underline-offset:.18em}img,svg{display:block;max-width:100%}button,input,select,textarea{font:inherit;color:inherit}.num,time,td.num{font-variant-numeric:tabular-nums}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}:focus-visible{outline:2px solid var(--ring);outline-offset:2px}::selection{background:color-mix(in oklch,var(--primary) 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(pointer:fine){.btn-solid:hover{background:var(--primary-hover)}.btn-outline:hover{background:var(--foreground);color:var(--background)}}.site-header{position:sticky;top:0;z-index:20;height:var(--header-h);background:color-mix(in oklch,var(--background) 90%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}@media(max-height:500px){.site-header{position:relative}}.bar{max-width:1312px;height:100%;margin:0 auto;padding:0 16px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:none}.brand-mark{width:28px;height:28px;color:var(--foreground)}.brand-name{font-weight:700;font-stretch:85%;font-size:var(--fs-3);letter-spacing:-.01em;line-height:1}.brand-name span{font-weight:400}.nav{margin-left:auto}.nav ul{display:flex;gap:4px}.nav a,.mnav a{display:flex;align-items:center;gap:8px;min-height:44px;padding:0 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svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.obj path,.obj circle{fill:none;stroke:var(--line);stroke-width:2;stroke-linejoin:round}.obj .thin{stroke-width:1}.dwg-shaft .obj *{vector-effect:non-scaling-stroke;stroke-width:1.75}.dwg-shaft .obj .thin{stroke-width:1}.hatch{color:var(--line-thin)}.ctr *{fill:none;stroke:var(--line-thin);stroke-width:1;stroke-dasharray:18 4 3 4;vector-effect:non-scaling-stroke}.dim *{fill:none;stroke:var(--dim);stroke-width:1;vector-effect:non-scaling-stroke}.dim .ext{stroke:var(--line-thin)}.dim .cut{stroke:var(--line);stroke-width:1.5}.dim .sym{stroke:var(--line);stroke-width:1.25}.lead *{fill:none;stroke:var(--line-thin);stroke-width:1;vector-effect:non-scaling-stroke}#ar path{fill:var(--dim)}.feat *{fill:none;stroke:var(--dim);stroke-width:4;opacity:0;vector-effect:non-scaling-stroke;transition:opacity var(--dur-hover) var(--ease-out)}.d{position:absolute;translate:-50% -50%;white-space:nowrap;padding:0 3px;line-height:1.25;font:400 clamp(11px,2.1cqi,14px)/1.25 var(--font-mono);color:var(--dim);background:var(--dwg-bg);transition:opacity var(--dur-hover) var(--ease-out)}.d-l{translate:0 -50%}.d-r{translate:-100% -50%}.d-tag{font-family:var(--font-sans);font-weight:600;color:var(--foreground);letter-spacing:.04em}.swap .d,.swap [data-mm]{opacity:.2}.bl{position:absolute;translate:-50% -50%;display:grid;place-items:center;width:clamp(22px,4.6cqi,30px);aspect-ratio:1;border-radius:50%;border:1.5px solid var(--line);background:var(--dwg-bg);font:400 clamp(11px,2.2cqi,13px)/1 var(--font-mono);color:var(--foreground);transition:background-color var(--dur-hover) var(--ease-out),color var(--dur-hover) var(--ease-out),border-color var(--dur-hover) var(--ease-out)}.callouts{display:grid;gap:32px;align-items:start}.dwg-shaft{border:1px solid var(--frame-line);background:var(--card)}.bom{width:100%;border-collapse:collapse;border-top:1.5px solid var(--line)}.bom th,.bom 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