:root{
  --paper:#1b4b82; --paper2:#173f6e; --ink:#eef5ff; --red:#ffd166; --faint:rgba(238,245,255,.6);
  --line:rgba(238,245,255,.22); --grid:rgba(238,245,255,.07); --grid2:rgba(238,245,255,.14); --mono:"DM Mono","SF Mono",ui-monospace,Menlo,Consolas,monospace;
  --sans:"Barlow Condensed","DIN Condensed","Arial Narrow",system-ui,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;background-color:var(--paper);background-image:linear-gradient(var(--grid2) 1px,transparent 1px),linear-gradient(90deg,var(--grid2) 1px,transparent 1px),linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:100px 100px,100px 100px,20px 20px,20px 20px;background-attachment:fixed;color:var(--ink);font-family:var(--mono);-webkit-font-smoothing:antialiased}
a{color:inherit}
.sheet{max-width:1080px;margin:0 auto;padding:20px 20px 60px;position:relative}
.sheet::before{content:"";position:fixed;inset:10px;border:2px solid var(--ink);pointer-events:none;opacity:.55}
.topbar{display:flex;justify-content:space-between;align-items:center;font-size:12px;letter-spacing:.14em;text-transform:uppercase;padding:10px 6px}
.topbar a{text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:2px}
.topbar a:hover{color:var(--red);border-color:var(--red)}
.kicker{color:var(--red);letter-spacing:.42em;font-size:14px;font-weight:700;text-align:center;margin:30px 0 4px;text-transform:uppercase}
h1.title{font-family:var(--sans);font-weight:800;font-size:clamp(40px,8vw,84px);line-height:.95;margin:0 0 18px;text-align:center;letter-spacing:.01em;text-transform:uppercase}
/* mechanism page */
.phead{text-align:center;margin:18px 0 22px}
.phead .kicker{margin-top:12px}
.phead h1.title{margin-bottom:10px}
.lede{max-width:560px;margin:0 auto;font-size:15px;line-height:1.5}
.box{border:1.5px solid var(--line);background:rgba(10,35,70,.35);padding:14px 16px}
.box h3{font-size:11px;letter-spacing:.22em;text-transform:uppercase;margin:0 0 10px;font-weight:600;color:var(--faint)}
.stage{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:18px;align-items:start}
@media(max-width:860px){.stage{grid-template-columns:1fr}}
.drawing{padding:10px 12px 14px;border-color:var(--ink)}
canvas{display:block;width:100%;background:transparent}
#main{aspect-ratio:4/3.1}
#graph{height:150px}
.side{display:grid;gap:18px}
.now b{color:var(--red);font-size:34px;line-height:1;font-family:var(--sans);letter-spacing:.03em;display:block;margin-bottom:6px}
.now span{font-size:12px;color:var(--faint)}
.notes ol{margin:0;padding-left:20px;font-size:13px;line-height:1.55}
.notes li{margin-bottom:8px}.notes li:last-child{margin-bottom:0}
.used p{margin:0;font-size:13px;line-height:1.5}
.controls{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;margin:10px 0 0;padding-top:12px;border-top:1px solid var(--line);font-size:11px;letter-spacing:.12em;text-transform:uppercase}
.controls button,.seg button{font:inherit;font-size:11px;letter-spacing:.14em;text-transform:uppercase;background:var(--ink);color:var(--paper2);border:1px solid var(--ink);padding:8px 14px;cursor:pointer}
.controls button:hover{background:var(--red);border-color:var(--red);color:var(--paper2)}
.controls button.ghost,.seg button{background:transparent;color:var(--ink)}
.seg button.on{background:var(--ink);color:var(--paper2)}
.seg button:hover{border-color:var(--red);color:var(--red)}.seg button.on:hover{color:var(--paper2)}
.seg{display:inline-flex}.seg button+button{border-left:0}
.controls label,.param{display:flex;gap:8px;align-items:center}
output{font-variant-numeric:tabular-nums;min-width:3.6em;color:var(--red);text-transform:none;letter-spacing:.02em}
input[type=range]{accent-color:var(--red);width:120px}
.adjust{margin-top:12px;padding-top:12px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px 24px;font-size:12px}
.adjust h3{flex-basis:100%;margin:0;font-size:11px;letter-spacing:.22em;text-transform:uppercase;font-weight:600;color:var(--faint)}
.plabel{letter-spacing:.06em}
.graphbox{margin-top:18px}
.graphbox .hint{margin:8px 0 0;font-size:11px;color:var(--faint)}
.titleblock{display:grid;grid-template-columns:1fr 1fr 1fr 150px;border:2px solid var(--ink);margin-top:18px;background:rgba(10,35,70,.35);font-size:13px}
.titleblock>div{padding:8px 12px;border-left:1px solid var(--ink);display:flex;flex-direction:column;justify-content:center}
.titleblock>div:first-child{border-left:0}
@media(max-width:620px){.titleblock{grid-template-columns:1fr 1fr}.titleblock>div:nth-child(3){border-left:0}.titleblock>div:nth-child(n+3){border-top:1px solid var(--ink)}}
.titleblock small{display:block;font-size:10px;letter-spacing:.2em;color:var(--faint);text-transform:uppercase;margin-bottom:2px}
.titleblock .brand{font-family:var(--sans);font-weight:800;font-size:22px;flex-direction:row;align-items:center;justify-content:center}
.titleblock .brand span,.titleblock .dwg{color:var(--red)}
.titleblock .dwg{font-family:var(--sans);font-weight:800;font-size:26px;text-align:right}
.pager{display:flex;justify-content:space-between;margin-top:22px;font-size:12px;letter-spacing:.14em;text-transform:uppercase}
.pager a{text-decoration:none}.pager a:hover{color:var(--red)}
/* landing */
.hero{text-align:center;padding:26px 0 8px}
.hero p{max-width:620px;margin:0 auto 22px;font-size:14px;line-height:1.6}
.filters{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:0 0 26px}
.filters button{font:inherit;font-size:11px;letter-spacing:.16em;text-transform:uppercase;border:1px solid var(--ink);background:transparent;color:var(--ink);padding:6px 12px;cursor:pointer}
.filters button.on,.filters button:hover{background:var(--ink);color:var(--paper)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.card{display:block;text-decoration:none;border:1.5px solid var(--ink);background:rgba(10,35,70,.35);transition:transform .15s,box-shadow .15s}
.card:hover{transform:translate(-3px,-3px);box-shadow:5px 5px 0 var(--red)}
.card canvas{aspect-ratio:1/.8;border-bottom:1px solid var(--ink)}
.card .meta{padding:9px 12px 11px}
.card .num{color:var(--red);font-size:11px;letter-spacing:.3em;font-weight:700}
.card .name{font-family:var(--sans);font-weight:800;font-size:24px;text-transform:uppercase;line-height:1}
.card .fn{font-size:11px;color:var(--faint);margin-top:4px;line-height:1.35}
.foot{margin-top:40px;font-size:11px;color:var(--faint);text-align:center;letter-spacing:.08em;line-height:1.7}
/* do the math */
.mathbox{margin-top:18px}
.tabs{display:flex;flex-wrap:wrap;gap:0;margin:0 0 14px;border-bottom:1px solid var(--line)}
.tabs button{font:inherit;font-size:11px;letter-spacing:.16em;text-transform:uppercase;background:transparent;color:var(--faint);border:0;border-bottom:2px solid transparent;padding:8px 14px;cursor:pointer;margin-bottom:-1px}
.tabs button.on{color:var(--ink);border-bottom-color:var(--red)}
.tabs button:hover{color:var(--red)}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:22px}
@media(max-width:760px){.calc{grid-template-columns:1fr}}
.calc h4{font-size:11px;letter-spacing:.2em;text-transform:uppercase;margin:0 0 8px;color:var(--faint);font-weight:600}
.fld{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:6px 0;border-bottom:1px dashed var(--line);font-size:12px}
.fld em,.rf em{font-style:italic;color:var(--faint)}
.fld i{font-style:normal;color:var(--red)}
.nin{display:flex;align-items:center;gap:6px}.nin small{min-width:3em;color:var(--faint)}
.mathbox input[type=number],.mathbox select{font:inherit;font-size:13px;width:96px;background:rgba(0,0,0,.18);color:var(--ink);border:1px solid var(--line);padding:5px 6px;text-align:right}
.mathbox select{width:auto;text-align:left}
.mathbox input:focus,.mathbox select:focus{outline:1px solid var(--red);border-color:var(--red)}
.note{font-size:11px;color:var(--faint);margin:10px 0 0;line-height:1.5}
.row{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1.6fr) minmax(90px,.7fr);gap:10px;align-items:baseline;padding:7px 0;border-bottom:1px dashed var(--line);font-size:12px}
@media(max-width:620px){.row{grid-template-columns:1fr auto}.row .rf{grid-column:1/-1;grid-row:2}}
.rl i{font-style:normal;font-size:9px;letter-spacing:.14em;text-transform:uppercase;color:var(--paper2);background:var(--red);padding:1px 4px;margin-left:4px;vertical-align:1px}
.rf{color:var(--ink);opacity:.9}.rf .sub{color:var(--faint)}
.rv{text-align:right;font-family:var(--sans);font-weight:800;font-size:19px;color:var(--red);letter-spacing:.02em;white-space:nowrap}
.rv small{font-family:var(--mono);font-weight:400;font-size:11px;color:var(--faint);margin-left:2px}
.row.warn .rv{color:#ff8f7a}
.prob p#ptext{font-size:15px;line-height:1.55;margin:0 0 12px;max-width:760px}
.ans{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.ans input{width:140px!important;text-align:left!important}
.ans button,.steps button{font:inherit;font-size:11px;letter-spacing:.14em;text-transform:uppercase;background:var(--ink);color:var(--paper2);border:1px solid var(--ink);padding:7px 12px;cursor:pointer}
.ans button.ghost,.steps button.ghost{background:transparent;color:var(--ink)}
.ans button:hover,.steps button:hover{border-color:var(--red);background:var(--red);color:var(--paper2)}
.fb{margin-top:12px;font-size:13px;min-height:1em}.fb.ok{color:#9be29b}.fb.no{color:#ff8f7a}
.steps ol{margin:10px 0;padding-left:20px;font-size:13px;line-height:1.7}
.chal{margin:0;padding-left:22px;display:grid;gap:12px}
.chal li{font-size:13px;line-height:1.5;padding:10px 12px;border:1px solid var(--line)}
.chal li.ok{border-color:#9be29b}.chal li.ok .ct{color:#9be29b}
.ct{font-weight:600;letter-spacing:.04em;margin-bottom:2px}.cg{color:var(--ink);opacity:.85}.cd{color:var(--faint);font-size:11px;margin-top:4px}
.chal details{margin-top:6px;font-size:12px;color:var(--faint)}.chal summary{cursor:pointer;color:var(--red)}
.genlinks{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center;margin:0 0 26px;font-size:12px;letter-spacing:.14em;text-transform:uppercase}
.genlinks span{color:var(--faint)}
.genlinks a{text-decoration:none;border:1.5px solid var(--red);color:var(--red);padding:8px 16px}.genlinks a:hover{background:var(--red);color:var(--paper2)}
a.box.make{display:block;text-decoration:none;border-color:var(--red)}a.box.make p{margin:0;font-size:13px;line-height:1.5}a.box.make:hover{background:rgba(255,209,102,.08)}