[hidden]{display:none!important}
/* LatheCalculator – mobile-first workshop theme. No web fonts, no external requests. */
:root{--ink:#1f2a33;--paper:#f4f1ea;--card:#fff;--steel:#5b6b78;--line:#d6d0c4;--accent:#f2a900;--accent-ink:#5a3f00;--ok:#2e7d32;--warn:#b26a00;--bad:#b3261e;--radius:10px;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--paper)}
a{color:#0b5c8a}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:9}
.site-header{background:var(--ink);color:#fff;position:sticky;top:0;z-index:5;box-shadow:0 2px 0 var(--accent)}
.header-row{display:flex;align-items:center;gap:10px;min-height:56px}
.brand{display:flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-size:1.2rem;margin-right:auto}
.brand b{color:var(--accent)}.logo{width:28px;height:28px;color:var(--accent)}
.units-toggle,.nav-toggle{font:inherit;font-size:.9rem;border:2px solid var(--accent);background:transparent;color:#fff;border-radius:999px;padding:6px 14px;min-height:40px;cursor:pointer}
.units-toggle[aria-pressed=true]{background:var(--accent);color:var(--ink)}
.site-nav{display:none;background:#2a3843}
.site-nav.open{display:block}
.site-nav .wrap{display:flex;flex-direction:column;padding-top:6px;padding-bottom:6px}
.site-nav a{color:#fff;text-decoration:none;padding:10px 4px;border-bottom:1px solid #3b4a56}
.site-nav a[aria-current=page]{color:var(--accent)}
@media(min-width:820px){.nav-toggle{display:none}.site-nav{display:block}.site-nav .wrap{flex-direction:row;gap:4px;flex-wrap:wrap}.site-nav a{border:0;padding:8px 10px}}
main{padding:20px 16px 40px}
h1{font-size:1.75rem;line-height:1.2;margin:.3em 0 .4em}
h2{font-size:1.3rem;margin:1.6em 0 .5em}
h3{font-size:1.08rem;margin:1.2em 0 .4em}
.lede{font-size:1.08rem;color:#36434d;max-width:65ch}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:16px 0;box-shadow:0 1px 0 rgba(0,0,0,.04)}
.grid{display:grid;gap:14px}
@media(min-width:640px){.grid.cols-2{grid-template-columns:1fr 1fr}.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
@media(min-width:900px){.calc{display:grid;grid-template-columns:minmax(300px,5fr) 7fr;gap:20px;align-items:start}}
label{display:block;font-weight:600;font-size:.95rem;margin-bottom:4px}
.field{margin-bottom:14px}
.hint{font-size:.85rem;color:var(--steel);font-weight:400}
input,select,button.btn{font:inherit;font-size:1.15rem;width:100%;min-height:52px;padding:10px 12px;border:2px solid #b9b2a4;border-radius:8px;background:#fff;color:var(--ink)}
input:focus,select:focus{outline:3px solid var(--accent);outline-offset:1px;border-color:var(--ink)}
input[type=range]{padding:0;min-height:40px;border:0;accent-color:var(--accent)}
input[type=checkbox]{width:24px;min-height:24px;height:24px;vertical-align:middle}
.check{display:flex;align-items:center;gap:10px;font-weight:600}
.inline{display:flex;gap:10px}.inline>*{flex:1}
button.btn{background:var(--accent);border-color:var(--accent);font-weight:700;cursor:pointer}
.results{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.result{background:#f9f7f2;border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:8px;padding:10px 12px}
.result .k{font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;color:var(--steel)}
.result .v{font:700 1.45rem/1.2 var(--mono)}
.result .u{font-size:.85rem;color:var(--steel)}
.result .alt{font:.88rem var(--mono);color:#455}
.big .v{font-size:2rem}
.est{display:inline-block;font:700 .7rem/1 system-ui;background:#fff3cd;color:var(--accent-ink);border:1px solid #e6c55c;border-radius:4px;padding:3px 5px;vertical-align:middle;margin-left:4px;text-transform:uppercase;letter-spacing:.04em}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
th{background:#efeadf}
td.num,th.num{text-align:right;font-family:var(--mono)}
.table-wrap{overflow-x:auto}
details.working{background:#20282f;color:#e8e6e1;border-radius:8px;padding:10px 14px;margin:12px 0}
details.working summary{cursor:pointer;font-weight:700;color:var(--accent)}
details.working ol{font:.9rem/1.6 var(--mono);padding-left:1.4em;margin:.6em 0}
.alert{border-radius:8px;padding:10px 14px;margin:10px 0;border:1px solid}
.alert.warn{background:#fff4e0;border-color:#f0c27a}
.alert.bad{background:#fde8e6;border-color:#eba59f}
.alert.info{background:#e9f2f8;border-color:#a9c9de}
.safety{border-left:5px solid var(--bad);background:#fff;padding:10px 14px;border-radius:6px;margin:16px 0}
.example{border-left:5px solid #0b5c8a;background:#fff;padding:10px 14px;border-radius:6px}
.tool-grid{display:grid;gap:12px}
@media(min-width:640px){.tool-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:900px){.tool-grid{grid-template-columns:repeat(3,1fr)}}
.tool-card{display:block;text-decoration:none;color:inherit;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;border-top:5px solid var(--accent)}
.tool-card:hover{border-color:var(--ink)}
.tool-card h3{margin:.1em 0 .3em;color:#0b5c8a}
.tool-card p{margin:0;color:#3a4650;font-size:.95rem}
.hero{background:linear-gradient(135deg,#1f2a33,#33444f);color:#fff;border-radius:14px;padding:24px 20px;margin:16px 0 18px}
.hero h1{color:#fff}.hero p{color:#dbe3e8;max-width:60ch}
.hero .btn-link{display:inline-block;background:var(--accent);color:var(--ink);font-weight:700;padding:12px 18px;border-radius:8px;text-decoration:none;margin-top:6px}
.search-results{list-style:none;margin:6px 0 0;padding:0;border:1px solid var(--line);border-radius:8px;max-height:280px;overflow:auto;background:#fff}
.search-results li button{all:unset;display:block;box-sizing:border-box;width:100%;padding:10px 12px;cursor:pointer;border-bottom:1px solid #eee}
.search-results li button:hover,.search-results li button:focus{background:#fff6dc}
.search-results small{display:block;color:var(--steel)}
.chosen{background:#fff6dc;border:1px solid #e6c55c;border-radius:8px;padding:10px 12px;margin-top:8px}
.badges span{display:inline-block;font-size:.75rem;padding:2px 7px;border-radius:999px;background:#e7e2d6;margin:2px 4px 2px 0}
.badges .wh{background:#fde8e6;color:var(--bad)}
.badges .cb{background:#e9f2f8;color:#0b5c8a}
.small{font-size:.85rem;color:#5d6770}
.site-footer{background:var(--ink);color:#cfd6db;padding:24px 0;margin-top:30px}
.site-footer a{color:#fff}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 16px;margin-bottom:10px}
.site-footer .small{color:#aeb8c0}
.placeholder{background:#fff3cd;padding:0 4px;border-radius:3px;font-family:var(--mono);font-size:.92em}
svg.pcd{width:100%;max-width:420px;height:auto;display:block;margin:14px auto;background:#fff;border:1px solid var(--line);border-radius:8px}
.fun-out{font-size:1.6rem;font-weight:700}
.legal h2{font-size:1.15rem}
.draft-banner{background:#fff3cd;border:1px solid #e6c55c;padding:10px 14px;border-radius:8px}
/* ---- Simple / Detailed mode ---- */
html[data-mode=simple] .detail-only{display:none!important}
html[data-mode=detailed] .simple-only{display:none!important}
.mode-toggle[aria-pressed=false]{background:transparent}
.result .means{font-size:.86rem;color:#2f3d47;margin-top:6px;line-height:1.35;border-top:1px dashed var(--line);padding-top:6px}
.answer{font-size:1.12rem;background:#fff6dc;border:1px solid #e6c55c;border-radius:8px;padding:10px 14px;margin:0 0 12px}
.answer strong{font-family:var(--mono)}
.term{border-bottom:2px dotted #0b5c8a;cursor:help;text-decoration:none;color:inherit}
.term:focus{outline:2px solid var(--accent);outline-offset:2px}
.term-tip{position:absolute;z-index:20;background:#1f2a33;color:#fff;border-radius:8px;padding:10px 12px;font-size:.9rem;line-height:1.4;box-shadow:0 6px 18px rgba(0,0,0,.25);font-weight:400}
.term-tip strong{color:var(--accent);display:block;margin-bottom:2px}
.term-tip a{color:#9fd3ff;display:inline-block;margin-top:4px}
@media(max-width:480px){.header-row{gap:6px}.brand{font-size:1rem;gap:5px}.logo{width:24px;height:24px}.units-toggle,.nav-toggle{font-size:.8rem;padding:5px 9px;min-height:38px}}
@media(max-width:360px){.brand span{display:none}}
/* ---- Machine picker ---- */
.machine-picker{background:#f9f7f2;border:1px solid var(--line);border-left:5px solid #0b5c8a;border-radius:8px;padding:12px;margin-bottom:14px}
.machine-picker .specs{font-size:.88rem;margin:8px 0 0;display:grid;grid-template-columns:auto 1fr;gap:2px 10px}
.machine-picker .specs dt{color:var(--steel)}.machine-picker .specs dd{margin:0}
.machine-picker .custom{margin-top:10px}
.machine-picker .small{margin:6px 0 0}
/* ---- Guides & flanges ---- */
.pro-tips{background:#eef6ee;border:1px solid #9cc79e;border-left:5px solid var(--ok);border-radius:8px;padding:10px 16px;margin:20px 0}
.pro-tips h2{margin:.3em 0 .3em;font-size:1.1rem}
.steps{counter-reset:s;list-style:none;padding:0}
.steps>li{counter-increment:s;position:relative;padding:0 0 12px 46px;margin:0 0 6px}
.steps>li::before{content:counter(s);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:50%;background:var(--accent);color:var(--ink);font-weight:700;display:flex;align-items:center;justify-content:center}
figure.diagram{margin:16px 0;background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px}
figure.diagram svg{width:100%;height:auto;max-height:340px;display:block}
figure.diagram figcaption{font-size:.85rem;color:var(--steel);margin-top:6px}
.guide-meta{font-size:.88rem;color:var(--steel)}
.std-banner{background:#fde8e6;border:2px solid var(--bad);border-radius:8px;padding:12px 14px;margin:12px 0;font-weight:600}
.cite{font-size:.8rem;color:var(--steel);white-space:normal}
.cite a{color:var(--steel)}
.breadcrumb{font-size:.88rem;margin:0 0 4px}
.glossary dt{font-weight:700;margin-top:14px;scroll-margin-top:80px}
.glossary dd{margin:2px 0 0}
.glossary dt:target{background:#fff6dc}
.pass{color:var(--ok);font-weight:700}.fail{color:var(--bad);font-weight:700}
.results .answer{grid-column:1/-1;margin:0}
a.btn-link{display:inline-block;background:var(--accent);color:var(--ink);font-weight:700;padding:12px 18px;border-radius:8px;text-decoration:none}
.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{font:inherit;border:2px solid var(--line);background:#fff;border-radius:999px;padding:8px 14px;min-height:44px;cursor:pointer}.chip[aria-checked="true"]{background:var(--accent);border-color:var(--accent);font-weight:700}
fieldset.field{border:0;padding:0;margin:0 0 14px}fieldset.field legend{font-weight:700;margin-bottom:6px}
#o{margin-top:8px}.fun-buttons{gap:8px;flex-wrap:wrap}.btn.secondary,button.btn.secondary{background:#fff;border-color:var(--ink)}
.fun-big{font-size:1.5rem;line-height:1.3;margin:0 0 10px}.fun-big strong{font-size:2.4rem;display:inline-block}
.emoji-strip{font-size:1.8rem;line-height:1.4;word-break:break-all;margin:8px 0}.emoji-strip span{font-size:1rem}
.fun-fact{font-size:1rem!important;font-weight:400!important;background:#fff8e1;border-radius:8px;padding:10px 12px}.fun-list{list-style:none;padding:0;margin:0}.fun-list li{padding:8px 0;border-bottom:1px solid var(--line);font-size:1.15rem}
.consent{position:fixed;left:0;right:0;bottom:0;z-index:20;background:#fff;border-top:3px solid var(--accent);box-shadow:0 -4px 16px rgba(0,0,0,.15);padding:12px 0;max-height:80vh;overflow:auto}
.consent-buttons{display:flex;flex-wrap:wrap;gap:8px}.consent-buttons .btn{flex:1 1 120px}.consent-row{display:flex;gap:10px;align-items:flex-start;margin:8px 0}.consent-row input{width:22px;height:22px;margin-top:3px}
.ad-slot{min-height:280px;margin:24px 0;background:#ece7dc;border-radius:var(--radius);position:relative;display:block}.ad-slot .ad-label{position:absolute;top:4px;left:8px;font-size:.75rem;color:var(--steel)}@media(min-width:760px){.ad-slot{min-height:250px}}
.aff-label{font-size:.85em;color:var(--steel)}.aff-disclosure{background:#fff8e1;border-radius:8px;padding:8px 12px}
.report-error{margin-top:24px}
.acme-table table{font-size:.9rem;white-space:nowrap}.acme-table .mm{color:var(--steel);font-size:.8rem}.acme-table tr.std{background:#fff8e1}.std-tag{display:inline-block;font-size:.7rem;font-weight:700;background:var(--ok);color:#fff;border-radius:4px;padding:0 5px;vertical-align:middle}
.acme-table thead th:first-child,.acme-table tbody th{position:sticky;left:0;background:inherit;background-color:#fff}
.acme-table tr.std th{background-color:#fff8e1}