@font-face{font-family:Atkinson Hyperlegible;font-style:normal;font-display:swap;font-weight:400;src:url(/_astro/atkinson-hyperlegible-latin-400-normal.BrHNak5F.woff2) format("woff2"),url(/_astro/atkinson-hyperlegible-latin-400-normal.BbWidj28.woff) format("woff")}@font-face{font-family:Atkinson Hyperlegible;font-style:normal;font-display:swap;font-weight:700;src:url(/_astro/atkinson-hyperlegible-latin-700-normal.GZI4o3u0.woff2) format("woff2"),url(/_astro/atkinson-hyperlegible-latin-700-normal.BK6Glc0m.woff) format("woff")}@font-face{font-family:Fraunces;font-style:normal;font-display:swap;font-weight:600;src:url(/_astro/fraunces-latin-600-normal.BFCDtZfi.woff2) format("woff2"),url(/_astro/fraunces-latin-600-normal.DL5QCzvS.woff) format("woff")}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(/_astro/ibm-plex-mono-latin-400-normal.DMJ8VG8y.woff2) format("woff2"),url(/_astro/ibm-plex-mono-latin-400-normal.CvHOgSBP.woff) format("woff")}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:500;src:url(/_astro/ibm-plex-mono-latin-500-normal.DSY6xOcd.woff2) format("woff2"),url(/_astro/ibm-plex-mono-latin-500-normal.CB9ihrfo.woff) format("woff")}:root{--paper: #f3efe4;--paper-2: #e6e0d1;--ink: #1c1915;--ink-soft: #514a40;--line: #d5cdbc;--panel: #fffcf6;--readout: #1b1916;--readout-text: #f4efe2;--readout-dim: #c9c0ae;--accent: #7a342c;--accent-soft: #f4e4de;--shadow: 0 1px 0 rgba(28, 25, 21, .04);--sans: "Atkinson Hyperlegible", "Segoe UI", sans-serif;--display: "Fraunces", "Iowan Old Style", Palatino, serif;--mono: "IBM Plex Mono", ui-monospace, monospace;--header: 4.25rem;color-scheme:light}[data-theme=shop]{--paper: #141210;--paper-2: #221e1a;--ink: #f3efe4;--ink-soft: #c9c0b0;--line: #3a342c;--panel: #1c1916;--readout: #0d0c0a;--readout-text: #f6f1c8;--readout-dim: #b7ad98;--accent: #e7a79a;--accent-soft: #3a2420;--shadow: none;color-scheme:dark}[data-cluster=crafts]{--accent: #7d2a24;--accent-soft: #f6e4df}[data-cluster=woodworking]{--accent: #6b4420;--accent-soft: #f3e7d4}[data-cluster=landscape]{--accent: #1f6b3a;--accent-soft: #e3f2e8}[data-cluster=concrete]{--accent: #3d4a57;--accent-soft: #e6eaee}[data-cluster=construction]{--accent: #8a3e22;--accent-soft: #f6e6dc}[data-cluster=electrical]{--accent: #5e3a16;--accent-soft: #f6ead8}[data-cluster=automotive]{--accent: #1e4d6b;--accent-soft: #e2eef4}[data-cluster=strength]{--accent: #8d3b16;--accent-soft: #f8e6da}[data-cluster=outdoors]{--accent: #1d4e86;--accent-soft: #e3ecf6}[data-cluster=kitchen]{--accent: #6d4b16;--accent-soft: #f6ecd4}[data-cluster=sellers]{--accent: #0f5c48;--accent-soft: #e1f2eb}[data-cluster=classic]{--accent: #3f3a34;--accent-soft: #ece7dc}[data-theme=shop][data-cluster=crafts]{--accent: #f0b2a8;--accent-soft: #3a2420}[data-theme=shop][data-cluster=woodworking]{--accent: #e2b27a;--accent-soft: #332616}[data-theme=shop][data-cluster=landscape]{--accent: #8dcea8;--accent-soft: #143024}[data-theme=shop][data-cluster=concrete]{--accent: #b7c3cf;--accent-soft: #1e242c}[data-theme=shop][data-cluster=construction]{--accent: #e8a88a;--accent-soft: #3a2218}[data-theme=shop][data-cluster=electrical]{--accent: #e2b48a;--accent-soft: #332616}[data-theme=shop][data-cluster=automotive]{--accent: #9ec4d8;--accent-soft: #162830}[data-theme=shop][data-cluster=strength]{--accent: #f0a27a;--accent-soft: #3a2418}[data-theme=shop][data-cluster=outdoors]{--accent: #9ec0ea;--accent-soft: #17283c}[data-theme=shop][data-cluster=kitchen]{--accent: #e6c27a;--accent-soft: #322816}[data-theme=shop][data-cluster=sellers]{--accent: #8ed4bf;--accent-soft: #143028}[data-theme=shop][data-cluster=classic]{--accent: #d9d0c2;--accent-soft: #2a2622}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;color:var(--ink);background-color:var(--paper);background-image:linear-gradient(to right,color-mix(in srgb,var(--ink) 5%,transparent) 1px,transparent 1px),linear-gradient(to bottom,color-mix(in srgb,var(--ink) 5%,transparent) 1px,transparent 1px);background-size:28px 28px;font-family:var(--sans);font-size:1.0625rem;line-height:1.55}body,button,input,select{font-variant-numeric:tabular-nums}img,svg{max-width:100%}a{color:inherit}a:hover{color:var(--accent)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.skip{position:absolute;left:1rem;top:-4rem;background:var(--ink);color:var(--paper);padding:.5rem .8rem;z-index:20}.skip:focus{top:.5rem}.wrap{width:min(1120px,calc(100% - 2rem));margin-inline:auto}.wrap-narrow{width:min(760px,calc(100% - 2rem));margin-inline:auto}.site-header{position:sticky;top:0;z-index:10;backdrop-filter:blur(10px);background:color-mix(in srgb,var(--paper) 88%,transparent);border-bottom:1px solid var(--line)}.header-row{display:flex;align-items:center;gap:.75rem;min-height:var(--header)}.logo{font-family:var(--display);font-weight:600;font-size:1.35rem;letter-spacing:-.03em;text-decoration:none;display:flex;align-items:baseline;gap:.35rem}.logo i{font-style:normal;width:.72rem;height:.72rem;border:1.5px solid currentColor;border-radius:50%;position:relative;display:inline-block}.logo i:before,.logo i:after{content:"";position:absolute;background:currentColor}.logo i:before{left:50%;top:-3px;bottom:-3px;width:1px;transform:translate(-50%)}.logo i:after{top:50%;left:-3px;right:-3px;height:1px;transform:translateY(-50%)}.logo span{color:var(--accent)}.site-nav{display:flex;gap:.25rem .9rem;flex-wrap:wrap;margin-left:.5rem}.site-nav a{text-decoration:none;font-size:.92rem;color:var(--ink-soft)}.site-nav a[aria-current=page]{color:var(--ink);box-shadow:inset 0 -2px 0 var(--accent)}.header-actions{margin-left:auto;display:flex;gap:.4rem}.icon-btn,.text-btn,.preset,.key,.actions button{font:inherit;color:var(--ink);background:var(--panel);border:1px solid var(--line);border-radius:2px;cursor:pointer}.icon-btn{min-width:2.5rem;min-height:2.5rem}.nav-toggle{display:none}main{padding:1.5rem 0 4rem}.kicker{margin:0 0 .35rem;color:var(--accent);font-family:var(--mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase}h1,h2,h3{font-family:var(--display);font-weight:600;letter-spacing:-.03em;line-height:1.15}h1{font-size:clamp(2.1rem,4vw,3.4rem);margin:0 0 .6rem}h2{font-size:1.7rem;margin:2.2rem 0 .6rem}h3{font-size:1.2rem;margin:1.2rem 0 .4rem}.lede{font-size:1.15rem;max-width:42rem;margin:0 0 .75rem}.checked,.meta-line{color:var(--ink-soft);font-family:var(--mono);font-size:.82rem}.crumbs{display:flex;flex-wrap:wrap;gap:.35rem;color:var(--ink-soft);font-size:.88rem;margin:0 0 1rem;padding:0;list-style:none}.crumbs a{text-decoration:none}.crumbs li:not(:last-child):after{content:"/";margin-left:.35rem;color:var(--line)}.hero{display:grid;grid-template-columns:1.4fr .8fr;gap:1.5rem;align-items:end;padding:1rem 0 1.5rem}.hero-card{background:var(--readout);color:var(--readout-text);padding:1.1rem 1.2rem 1.2rem;border-radius:2px;min-height:11rem}.hero-card a{color:inherit}.hero-card .kicker{color:var(--readout-dim)}.hero-figure{font-family:var(--mono);font-size:clamp(1.8rem,3vw,2.4rem);margin:.4rem 0}.hero-card p{margin:.2rem 0;color:var(--readout-dim)}.hub-grid,.calc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.8rem}.hub-card,.calc-card{background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--card-accent, var(--accent));border-radius:2px;padding:.9rem 1rem 1rem;box-shadow:var(--shadow);text-decoration:none;display:flex;flex-direction:column;gap:.35rem;min-height:100%}.hub-card h2,.calc-card h2,.calc-card h3{margin:0;font-size:1.35rem}.hub-card p,.calc-card p{margin:0;color:var(--ink-soft)}.chip-row{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:auto;padding-top:.45rem}.chip{font-family:var(--mono);font-size:.75rem;text-decoration:none;border:1px solid var(--line);padding:.15rem .4rem;border-radius:99px;color:var(--ink-soft)}.section-head{display:flex;justify-content:space-between;gap:1rem;align-items:baseline;margin-top:2rem}.section-head h2{margin:0}.workbench{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:1rem;margin:1.2rem 0 .5rem;align-items:start}.panel{background:var(--panel);border:1px solid var(--line);border-radius:2px;padding:1rem}.panel h2{margin:0 0 .8rem;font-size:1.15rem}.fields{display:grid;gap:.75rem}.fields.cols{grid-template-columns:1fr 1fr}.field label,.select-field label{display:block;font-size:.92rem;margin-bottom:.25rem}.control{display:flex;align-items:stretch;border:1px solid var(--line);background:var(--paper);border-radius:2px}.control input,.select-field select,.expr{flex:1;border:0;background:transparent;color:var(--ink);font:500 1.15rem/1.2 var(--mono);padding:.65rem .55rem;min-width:0;width:100%}.control button{width:2.4rem;border:0;background:transparent;color:var(--ink);font-size:1.2rem;cursor:pointer}.control button:hover,.preset:hover,.icon-btn:hover{background:var(--accent-soft)}.suffix{align-self:center;padding-right:.45rem;color:var(--ink-soft);font-family:var(--mono);font-size:.85rem}.hint{margin:.25rem 0 0;color:var(--ink-soft);font-size:.85rem}.presets{display:flex;gap:.4rem;overflow-x:auto;padding-bottom:.2rem;margin:.2rem 0 .8rem}.preset{white-space:nowrap;padding:.35rem .6rem;font-size:.85rem}.check{display:flex;gap:.55rem;align-items:center;font-size:.95rem;margin:.55rem 0}.check input{width:24px;height:24px;margin:0;accent-color:var(--accent);flex:0 0 24px}.select-field select{border:1px solid var(--line);background:var(--paper);border-radius:2px;padding:.7rem .55rem}.readout{background:var(--readout);color:var(--readout-text);border-radius:2px;padding:1rem 1rem .9rem}.readout .kicker{color:var(--readout-dim)}.readout-value{font-family:var(--mono);font-size:clamp(1.7rem,3vw,2.35rem);line-height:1.15;margin:.2rem 0 .6rem}.readout dl{display:grid;grid-template-columns:1fr 1fr;gap:.55rem .8rem;margin:0}.readout dt{color:var(--readout-dim);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase}.readout dd{margin:0;font-family:var(--mono)}.warning{color:#ffd0a8;margin:.6rem 0 0;font-size:.92rem}.actions{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.8rem}.actions button{padding:.45rem .7rem;background:var(--panel);color:var(--ink)}.actions button[data-copied="1"]:after{content:" · copied";color:var(--accent)}.diagram{margin-top:.8rem;background:var(--panel);border:1px solid var(--line);border-radius:2px;color:var(--ink)}.diagram svg{display:block;width:100%;height:auto}.shopping{margin-top:.8rem;font-family:var(--mono);font-size:.92rem;white-space:pre-wrap}.prose{max-width:46rem}.prose p{margin:.6rem 0}.equation{font-family:var(--mono);background:var(--panel);border-left:3px solid var(--accent);padding:.7rem .9rem;overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:.95rem;background:var(--panel)}th,td{text-align:left;padding:.45rem .55rem;border-bottom:1px solid var(--line);vertical-align:top}th{font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft);font-weight:500}td.num,th.num{text-align:right;font-family:var(--mono)}.table-wrap{overflow-x:auto;border:1px solid var(--line)}.faq details{border-bottom:1px solid var(--line);padding:.7rem 0}.faq summary{cursor:pointer;font-weight:700}.faq p{margin:.45rem 0 .2rem}.source-list{padding-left:1.1rem}.source-list a{color:var(--accent)}.sheet{display:grid;grid-template-columns:repeat(10,minmax(4.2rem,1fr));gap:.3rem;overflow-x:auto}.frame{border:1px solid var(--line);background:var(--paper);min-width:4.2rem}.frame header{font-family:var(--mono);font-size:.72rem;padding:.15rem .3rem;color:var(--ink-soft);border-bottom:1px solid var(--line)}.rolls{display:grid;grid-template-columns:1fr 1fr}.frame.tenth .rolls{grid-template-columns:1fr 1fr 1fr}.rolls input{width:100%;border:0;border-left:1px solid var(--line);background:transparent;color:var(--ink);text-align:center;font:500 1rem var(--mono);padding:.45rem 0}.rolls input:first-child{border-left:0}.frame output{display:block;text-align:center;font-family:var(--mono);padding:.35rem .2rem .45rem;min-height:1.6rem}.keys{display:grid;grid-template-columns:repeat(5,1fr);gap:.35rem;margin-top:.7rem}.key{min-height:2.8rem;font-family:var(--mono)}.key.eq{background:var(--accent);color:var(--paper);border-color:var(--accent)}[data-theme=shop] .key.eq{color:#1b1916}.expr{border:1px solid var(--line);background:var(--paper);border-radius:2px}.history{list-style:none;padding:0;margin:.6rem 0 0;font-family:var(--mono);font-size:.85rem;color:var(--ink-soft)}.history li{display:flex;justify-content:space-between;gap:1rem}.site-footer{border-top:1px solid var(--line);padding:1.5rem 0 2rem;color:var(--ink-soft);font-size:.92rem}.footer-grid{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.site-footer a{color:var(--ink)}.site-footer nav{display:flex;gap:.9rem}dialog{border:1px solid var(--line);background:var(--panel);color:var(--ink);width:min(32rem,calc(100% - 2rem));border-radius:2px;padding:.8rem}dialog::backdrop{background:#14121073}#q{width:100%;font:1rem var(--sans);padding:.6rem;border:1px solid var(--line);background:var(--paper);color:var(--ink)}#search-results{list-style:none;padding:0;margin:.5rem 0 0;max-height:50vh;overflow:auto}#search-results a{display:block;text-decoration:none;padding:.45rem .2rem;border-bottom:1px solid var(--line)}#search-results small{display:block;color:var(--ink-soft)}@media(max-width:900px){.hero,.workbench,.hub-grid{grid-template-columns:1fr}.calc-grid{grid-template-columns:1fr 1fr}.nav-toggle{display:inline-flex;align-items:center;justify-content:center}.site-nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--paper);border-bottom:1px solid var(--line);padding:.6rem 1rem .9rem;margin:0;flex-direction:column}.site-nav.open{display:flex}.header-row{position:relative}}@media(max-width:640px){.calc-grid,.readout dl,.fields.cols{grid-template-columns:1fr}.wrap{width:min(1120px,calc(100% - 1.25rem))}h1{font-size:2rem}.keys{grid-template-columns:repeat(4,1fr)}}@media print{body{background:#fff;color:#000}.site-header,.site-footer,.presets,.actions,.nav-toggle,.no-print,dialog{display:none!important}.workbench,.hero{display:block}.readout,.hero-card{background:#fff;color:#000;border:1px solid black}.readout dt,.readout .kicker{color:#333}a{text-decoration:none}.panel,.diagram{break-inside:avoid}}