:root{--surface:#f4f3ee;--surface-elevated:#fff;--ink:#222a28;--ink-muted:#59645f;--rule:#d4dad2;--contact:#bedb45;--contact-ink:#29301b;--danger:#b63536;--warning:#8a581d;--font-body:"IBM Plex Sans", "Noto Sans", "Segoe UI", system-ui, sans-serif;--font-mono:"IBM Plex Mono", ui-monospace, "Cascadia Mono", monospace;--radius:8px;--radius-soft:4px;--content-width:72rem;--gutter:clamp(1rem, 4vw, 3rem)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{min-width:320px;font-family:var(--font-body);color:var(--ink);background:var(--surface);margin:0;font-size:1rem;line-height:1.6}a{color:inherit;text-underline-offset:.2em;text-decoration-thickness:.08em}a:hover{color:var(--ink-muted)}:focus-visible{outline:3px solid var(--ink);outline-offset:2px;border-radius:2px}.visually-hidden{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;position:absolute;overflow:hidden}.skip-link{inset-inline-start:1rem;z-index:10;background:var(--contact);color:var(--contact-ink);border-radius:var(--radius-soft);padding:.5rem 1rem;font-weight:600;transition:top .12s;position:absolute;top:-3rem}.skip-link:focus{top:.5rem}.site-header{background:var(--surface-elevated);border-bottom:1px solid var(--rule)}.header-inner{max-width:var(--content-width);padding:.7rem var(--gutter);flex-wrap:wrap;align-items:center;gap:1.2rem;margin-inline:auto;display:flex}.wordmark{letter-spacing:.02em;align-items:center;gap:.55rem;font-size:1.22rem;font-weight:700;text-decoration:none;display:inline-flex}.wordmark-mark{width:34px;height:34px}.mark-belt{fill:var(--ink)}.mark-bristle line{stroke:var(--ink);stroke-width:2px}.mark-contact{fill:var(--contact)}.site-nav{flex-wrap:wrap;gap:.35rem 1.1rem;font-size:.95rem;display:flex}.site-nav a{border-bottom:2px solid #0000;padding:.2rem .1rem;text-decoration:none}.site-nav a:hover{border-bottom-color:var(--contact);color:var(--ink)}.header-tools{flex-wrap:wrap;align-items:center;gap:.8rem;margin-inline-start:auto;display:flex}.site-search{gap:.4rem;display:flex}.site-search input{font:inherit;border:1px solid var(--rule);border-radius:var(--radius-soft);background:var(--surface);min-width:9.5rem;color:inherit;padding:.38rem .7rem;font-size:.9rem}.site-search button{font:inherit;cursor:pointer;background:var(--ink);color:var(--surface-elevated);border-radius:var(--radius-soft);border:none;padding:.38rem .8rem;font-size:.9rem}.locale-switch{font-size:.9rem;position:relative}.locale-switch summary{cursor:pointer;border:1px solid var(--rule);border-radius:var(--radius-soft);white-space:nowrap;padding:.34rem .7rem;list-style:none}.locale-switch summary::-webkit-details-marker{display:none}.locale-switch summary:after{content:" ▾"}.locale-switch ul{inset-inline-end:0;z-index:5;background:var(--surface-elevated);border:1px solid var(--rule);border-radius:var(--radius);min-width:11rem;margin:0;padding:.3rem;list-style:none;position:absolute;top:calc(100% + .3rem);box-shadow:0 6px 18px #222a281f}.locale-switch a{border-radius:var(--radius-soft);padding:.3rem .55rem;text-decoration:none;display:block}.locale-switch a:hover{background:var(--surface)}.locale-switch a[aria-current=true]{background:var(--contact);color:var(--contact-ink);font-weight:600}.search-results{max-width:var(--content-width);padding:0 var(--gutter) .4rem;margin:0 auto;font-size:.95rem}.search-results p{border-bottom:1px solid var(--rule);padding:.35rem 0}.search-results a{font-weight:600}.search-results small{color:var(--ink-muted)}main{display:block}.page{max-width:var(--content-width);padding:clamp(1.6rem, 4vw, 3rem) var(--gutter) 3.5rem;margin-inline:auto}.breadcrumbs{color:var(--ink-muted);margin-bottom:1.1rem;font-size:.85rem}.breadcrumbs ol{flex-wrap:wrap;gap:.35rem;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs li+li:before{content:" → ";margin-inline-end:.35rem}[dir=rtl] .breadcrumbs li+li:before{content:" ← "}h1,h2,h3{text-wrap:balance;line-height:1.2}h1{margin:0 0 .8rem;font-size:clamp(1.7rem,3.4vw,2.6rem)}h2{margin:2.2rem 0 .7rem;font-size:clamp(1.25rem,2.2vw,1.6rem)}h3{margin:1.4rem 0 .5rem;font-size:1.08rem}p{margin:.55rem 0}.eyebrow{letter-spacing:.14em;text-transform:uppercase;color:var(--ink-muted);margin-bottom:.7rem;font-size:.8rem;font-weight:700;display:inline-block}.lede{max-width:46rem;color:var(--ink-muted);font-size:1.12rem}.cta-row{flex-wrap:wrap;gap:.7rem;margin-top:1.4rem;display:flex}.button{border-radius:var(--radius-soft);cursor:pointer;font-weight:600;font:inherit;border:2px solid var(--ink);padding:.6rem 1.15rem;font-size:.98rem;text-decoration:none;display:inline-block}.button-primary{background:var(--contact);border-color:var(--contact);color:var(--contact-ink)}.button-primary:hover{filter:brightness(.96);color:var(--contact-ink)}.button-quiet{color:var(--ink);background:0 0}.button-quiet:hover{background:var(--surface-elevated);color:var(--ink)}.button[disabled]{opacity:.55;cursor:not-allowed}.hero{align-items:center;gap:2rem;display:grid}@media (width>=56rem){.hero{grid-template-columns:42fr 58fr}}.hero-graphic{position:relative}.hero-graphic .graphic{width:100%;height:auto}.card-grid{gap:1rem;margin-top:1.2rem;display:grid}@media (width>=40rem){.card-grid{grid-template-columns:repeat(2,1fr)}}@media (width>=64rem){.card-grid.cols-3{grid-template-columns:repeat(3,1fr)}}.card{background:var(--surface-elevated);border:1px solid var(--rule);border-radius:var(--radius);flex-direction:column;gap:.5rem;padding:1.1rem 1.2rem;display:flex}.card h3{margin:0}.card p{color:var(--ink-muted);margin:0;font-size:.96rem}.card .card-cta{margin-top:auto;font-size:.95rem;font-weight:600}.card-index{gap:0 1.2rem;margin-top:1rem;display:grid}@media (width>=40rem){.card-index{grid-template-columns:repeat(2,1fr)}}.index-row{border-top:1px solid var(--rule);grid-template-columns:auto 1fr;align-items:baseline;gap:.4rem .9rem;padding:.85rem .2rem;display:grid}.index-row .glyph{width:44px;height:30px;color:var(--ink)}.index-row a{font-weight:600;text-decoration:none}.index-row a:hover{text-decoration:underline}.index-row p{color:var(--ink-muted);margin:0;font-size:.92rem}.graphic{width:100%;height:auto;display:block}.graphic .belt,.graphic .roller-body,.graphic .shaft,.graphic .pulley{fill:var(--ink)}.graphic .belt-line{stroke:var(--ink);stroke-width:3px;fill:none}.graphic .belt-thick path{stroke:var(--ink);stroke-width:14px}.graphic .belt.chevron{fill:var(--ink)}.graphic .belt-marks line{stroke:var(--surface);stroke-width:3px}.graphic .roller circle{fill:none;stroke:var(--ink);stroke-width:5px}.graphic .core{fill:var(--ink)!important;stroke:none!important}.graphic .bristle line{stroke:var(--ink);stroke-width:2.5px;stroke-linecap:round}.graphic .bristle-ring{fill:none;stroke:var(--rule);stroke-width:2px}.graphic .contact{fill:var(--contact)}.graphic .arrow{fill:var(--ink)}.graphic .rotation{fill:none;stroke:var(--ink-muted);stroke-width:4px;stroke-dasharray:8 7}.graphic .dims line{stroke:var(--ink-muted);stroke-width:2px}.graphic .dims .dim-accent{stroke:var(--contact-ink);stroke-width:3px}.graphic .section{fill:var(--ink)}.graphic .section-soft{fill:var(--rule)}.graphic .divider{stroke:var(--rule);stroke-width:2px;stroke-dasharray:4 6}.graphic .deposit{fill:var(--warning);opacity:.55}.graphic .v1,.graphic .v2{stroke:var(--ink);stroke-width:5px}.graphic .vrel{stroke-width:6px}.graphic .vectors path{fill:var(--ink)}.graphic .bracket,.graphic .scraper .blade{fill:var(--ink-muted)}.graphic .arm{stroke:var(--ink-muted);stroke-width:6px}figure.graphic-figure{background:var(--surface-elevated);border:1px solid var(--rule);border-radius:var(--radius);margin:1.6rem 0;padding:1.2rem}figure.graphic-figure figcaption{color:var(--ink-muted);margin-top:.6rem;font-size:.9rem}.table-wrap{border:1px solid var(--rule);border-radius:var(--radius);background:var(--surface-elevated);margin:1rem 0;overflow-x:auto}table{border-collapse:collapse;width:100%;min-width:30rem;font-size:.95rem}th,td{text-align:start;border-bottom:1px solid var(--rule);vertical-align:top;padding:.6rem .9rem}thead th{background:var(--surface);text-transform:uppercase;letter-spacing:.06em;font-size:.86rem}tbody tr:last-child td{border-bottom:none}td.num,th.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;white-space:nowrap}.table-hint{color:var(--ink-muted);margin-top:-.4rem;font-size:.82rem}.tool-layout{gap:1.5rem;margin-top:1.4rem;display:grid}@media (width>=56rem){.tool-layout{grid-template-columns:58fr 42fr;align-items:start}}.tool-form{background:var(--surface-elevated);border:1px solid var(--rule);border-radius:var(--radius);gap:1rem;padding:1.2rem 1.3rem;display:grid}.field{gap:.3rem;display:grid}.field>label{font-size:.94rem;font-weight:600}.field .hint{color:var(--ink-muted);font-size:.84rem}.field input[type=text],.field input[type=number],.field select{font:inherit;border:1px solid var(--rule);border-radius:var(--radius-soft);background:var(--surface);color:inherit;max-width:16rem;padding:.5rem .7rem}.field input[aria-invalid=true]{border-color:var(--danger)}.field-error{color:var(--danger);min-height:1.2em;font-size:.88rem}.radio-set{gap:.35rem;display:grid}.radio-set label{border-radius:var(--radius-soft);align-items:baseline;gap:.5rem;padding:.25rem .3rem;font-size:.96rem;display:flex}.radio-set label:hover{background:var(--surface)}.tool-actions{flex-wrap:wrap;gap:.6rem;display:flex}.tool-output{background:var(--surface-elevated);border:1px solid var(--rule);border-radius:var(--radius);padding:1.2rem 1.3rem}.tool-output .placeholder{color:var(--ink-muted)}.result-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:1.9rem}.result-warning{color:var(--warning);margin-top:.4rem;font-size:.92rem}.formula-box{background:var(--surface);border-radius:var(--radius);font-family:var(--font-mono);padding:.9rem 1rem;font-size:.95rem}.formula-box ul,.result-list{margin:.5rem 0 0;padding-inline-start:1.2rem}.request-box{background:var(--surface);border:1px dashed var(--ink-muted);border-radius:var(--radius);font-family:var(--font-mono);white-space:pre-wrap;padding:.9rem 1rem;font-size:.88rem}.step-meter{color:var(--ink-muted);font-size:.9rem}.selector-result h3{margin-top:.2rem}.note{border-inline-start:4px solid var(--contact);background:var(--surface-elevated);border-radius:var(--radius-soft);margin:1rem 0;padding:.8rem 1rem;font-size:.97rem}.note-warn{border-inline-start-color:var(--warning)}.note-danger{border-inline-start-color:var(--danger)}.section-split{border-top:1px solid var(--rule);margin-top:2.4rem;padding-top:1.6rem}.article-body{max-width:44rem}.article-body h2{margin-top:1.8rem}.meta-line{color:var(--ink-muted);font-size:.88rem}.site-footer{background:var(--surface-elevated);border-top:1px solid var(--rule);margin-top:2rem}.footer-inner{max-width:var(--content-width);padding:1.4rem var(--gutter) 1.8rem;color:var(--ink-muted);gap:.5rem;margin-inline:auto;font-size:.9rem;display:grid}.footer-inner nav{flex-wrap:wrap;gap:.4rem 1.2rem;display:flex}.footer-inner a{color:var(--ink);text-decoration:none}.footer-inner a:hover{text-decoration:underline}.footer-meta{margin:0}@media print{.site-header,.site-footer,.site-search,.locale-switch,.search-results,.tool-actions,.skip-link{display:none!important}body{background:#fff}.tool-output,.request-box,figure.graphic-figure{border-color:#999}a{color:#000;text-decoration:none}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}