*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--link);text-underline-offset:3px}
.hdr{background:var(--brand);color:#fff;padding:12px 16px}
.hdr-in{max-width:1000px;margin:0 auto;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.hdr a{color:#fff;text-decoration:none}
.logo{font-weight:800;font-size:19px;letter-spacing:-.02em;display:inline-flex;align-items:center;gap:8px}.logo b{color:var(--logo)}.logo svg{width:28px;height:28px;flex:none}
.nav{margin-left:auto;display:flex;gap:16px;font-size:14px;flex-wrap:wrap}.nav a{opacity:.9}.nav a:hover{opacity:1;text-decoration:underline}
.crumbs{max-width:1000px;margin:12px auto 0;padding:0 16px;font-size:13px;color:var(--muted)}.crumbs a{color:var(--muted)}
main{max-width:1000px;margin:0 auto;padding:8px 16px 16px}
h1{font-size:clamp(26px,4.2vw,36px);line-height:1.15;margin:14px 0 8px;letter-spacing:-.02em}
.lede{color:var(--muted);max-width:66ch;margin:0 0 16px}
.calc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.calc .full{grid-column:1/-1}
.fld{display:flex;flex-direction:column;gap:5px}.fld label{font-size:13px;font-weight:650;color:var(--muted)}
.fld input,.fld select{width:100%;min-height:44px;padding:9px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font:inherit}
.fld input:focus,.fld select:focus{outline:2px solid var(--link);outline-offset:1px}
.fld small{color:var(--muted);font-size:12px}
.cta{grid-column:1/-1;background:var(--accent);color:var(--accent-ink);border:0;border-radius:8px;min-height:48px;font:700 16px/1 system-ui;cursor:pointer}
.cta:hover{filter:brightness(1.07)}
.results{grid-column:1/-1;background:var(--bg);border-radius:10px;padding:12px;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.res{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px}
.res .n{font-size:22px;font-weight:800;letter-spacing:-.01em;color:var(--link);word-break:break-word}
.res .l{font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-top:3px}
.res.hero{border-color:var(--accent);border-width:2px}.res.hero .n{font-size:26px}
.note{grid-column:1/-1;margin:0;padding:10px 12px;border-radius:8px;background:var(--bg);border-left:3px solid var(--accent);font-size:14px}
.ad{display:block;margin:22px auto;min-height:250px}.ad-top{min-height:100px}
.ad-ph{display:flex;align-items:center;justify-content:center;border:1px dashed var(--line);border-radius:8px;color:var(--muted);font-size:12px;background:var(--surface)}
.prose h2{font-size:22px;margin:30px 0 10px;letter-spacing:-.01em}.prose h3{font-size:17px;margin:20px 0 6px}
.prose p,.prose li{max-width:70ch}.prose ul,.prose ol{padding-left:22px}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--surface);border:1px solid var(--line);padding:10px 12px;border-radius:8px;overflow-x:auto;font-size:14px}
.tip{border-left:3px solid var(--accent);background:var(--surface);padding:12px 14px;margin:14px 0;border-radius:0 8px 8px 0}
.tblw{overflow-x:auto}.tbl{width:100%;border-collapse:collapse;margin:12px 0;font-size:14px}
.tbl th,.tbl td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);white-space:nowrap}.tbl th{background:var(--surface);font-weight:650}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:14px 0}
.card{display:block;padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--ink)}
.card:hover{border-color:var(--accent)}.card h3{margin:0 0 4px;font-size:16px;color:var(--link)}.card p{margin:0;font-size:13.5px;color:var(--muted)}
details{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px 14px;margin:8px 0}
details summary{font-weight:650;cursor:pointer}details[open] summary{margin-bottom:6px}
.meta{font-size:13px;color:var(--muted);margin-top:24px}
footer{background:var(--surface);border-top:1px solid var(--line);padding:26px 16px;margin-top:40px;color:var(--muted);font-size:14px}
.fcols{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:20px}
.fcols .fh{color:var(--ink);font-size:13px;font-weight:700;margin:0 0 8px;text-transform:uppercase;letter-spacing:.06em}
.fcols ul{list-style:none;padding:0;margin:0}.fcols li{margin:5px 0}.fcols a{color:var(--muted);text-decoration:none}.fcols a:hover{color:var(--ink)}
.copy{max-width:1000px;margin:18px auto 0;font-size:12.5px}
.byline{font-size:13.5px;color:var(--muted);margin:-4px 0 14px}.byline a{color:var(--link)}
.qa h2{font-size:20px}.src{font-size:14px}.src li{margin:4px 0}
.tools{grid-column:1/-1;display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn2{background:transparent;border:1px solid var(--line);color:var(--ink);border-radius:8px;min-height:40px;padding:0 14px;font:600 14px/1 system-ui;cursor:pointer}
.btn2:hover{border-color:var(--accent)}.share-ok{font-size:13px;color:var(--muted);word-break:break-all}
.embed textarea{width:100%;min-height:120px;font:12.5px/1.45 ui-monospace,Menlo,Consolas,monospace;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);margin:6px 0 8px}
.embed-body{background:var(--surface)}.embed-body main{padding:8px}.credit{font-size:13px;color:var(--muted);margin:10px 2px 0}
.gtbl td,.gtbl th{white-space:normal}
.dgm{margin:18px 0;max-width:600px;color:var(--ink)}.dgm svg{width:100%;height:auto;display:block}
.dgm figcaption{font-size:13px;color:var(--muted);margin-top:6px}
.steps{counter-reset:s;list-style:none;padding-left:0}.steps li{counter-increment:s;position:relative;padding-left:34px;margin:8px 0}
.steps li:before{content:counter(s);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:50%;background:var(--accent);color:var(--accent-ink);font:700 13px/24px system-ui;text-align:center}
@media(max-width:640px){.calc{grid-template-columns:1fr;padding:14px}.nav{margin-left:0;width:100%;gap:12px}}
@media print{.hdr .nav,.ad,.ad-ph,footer,.crumbs,.tools,.embed,.grid,.cta{display:none!important}body{background:#fff;color:#000}.calc,.res{border-color:#999}}

body{font-family:var(--fb);font-size:var(--fs)}
h1,h2,h3,.logo,.card h3,.fcols .fh,.tile b,.rows b{font-family:var(--fh)}
.res .n,.tbl td strong{font-family:var(--fn)}
.calc,.card,.res,details,.formula,.fld input,.fld select,.cta,.btn2,.note,.results,.ad-ph,.tile,.hhero,.chip{border-radius:var(--r)}
/* headers */
.d-h-light .hdr{background:var(--surface);color:var(--ink);border-bottom:4px solid var(--brand)}
.d-h-light .hdr a{color:var(--ink)}
.d-h-light .nav a{padding:5px 13px;border-radius:999px;background:color-mix(in srgb,var(--brand) 10%,transparent);opacity:1;font-weight:600}
.d-h-light .nav a:hover{background:color-mix(in srgb,var(--brand) 20%,transparent);text-decoration:none}
.d-h-stack .hdr-in{flex-direction:column;gap:10px;align-items:center}
.d-h-stack .logo{font-size:24px;letter-spacing:.05em;text-transform:uppercase}
.d-h-stack .nav{margin:0;justify-content:center;border-top:1px solid rgba(255,255,255,.25);padding-top:10px;width:100%}
.d-h-center .hdr{padding:18px 16px 14px}.d-h-center .hdr-in{flex-direction:column;gap:10px}.d-h-center .logo{font-size:25px}
.d-h-center .nav{margin:0;justify-content:center}.d-h-center .nav a{padding:6px 14px;border-radius:999px;font-weight:600;opacity:1}
/* calculator layouts */
.d-c-flat .calc{background:transparent;border:0;border-top:3px solid var(--accent);border-radius:0;padding:20px 0 0}
.d-c-flat .fld input,.d-c-flat .fld select{border-width:2px;min-height:50px;font-size:17px}
.d-c-flat .results{background:transparent;padding:0}.d-c-flat .res{border:0;background:color-mix(in srgb,var(--accent) 16%,var(--surface))}
.d-c-ledger .calc{grid-template-columns:1fr;gap:0;padding:0;overflow:hidden}
.d-c-ledger .fld{flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:4px 12px;padding:10px 16px;border-bottom:1px solid var(--line)}
.d-c-ledger .fld label{flex:1 1 40%}.d-c-ledger .fld input,.d-c-ledger .fld select{width:48%;min-width:130px;flex:0 0 48%}
.d-c-ledger .fld small{flex-basis:100%;order:3}
.d-c-ledger .cta,.d-c-ledger .results,.d-c-ledger .note,.d-c-ledger .tools{margin:14px 16px 0}.d-c-ledger .tools{margin-bottom:14px}
.d-c-top .results{order:-1;background:var(--brand)}
.d-c-top .res{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.2)}.d-c-top .res .n{color:#fff}.d-c-top .res .l{color:rgba(255,255,255,.75)}
.d-c-top .res.hero{border-color:var(--accent)}
.d-c-dark .calc{--surface:#151b26;--ink:#e8ecf3;--muted:#9aa4b5;--line:#2a3344;--bg:#0b0f16;--link:var(--accent);background:#0e131b;border-color:#2a3344;color:#e8ecf3}
.d-c-dark .res .n{color:var(--accent)}.d-c-dark .btn2{color:#e8ecf3}
/* homepage layouts */
.hhero{background:var(--brand);color:#fff;padding:28px 24px;margin:14px 0}.hhero h1{margin:0 0 8px;color:#fff}.hhero .lede{color:rgba(255,255,255,.86);margin-bottom:0}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:20px}
.tile{display:block;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.24);padding:14px;color:#fff;text-decoration:none}
.tile:hover{background:rgba(255,255,255,.18)}.tile b{display:block;font-size:17px;margin-bottom:3px}.tile span{font-size:13.5px;opacity:.88}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.chip{padding:7px 14px;border:1px solid var(--line);background:var(--surface);border-radius:999px;text-decoration:none;font-size:14px;color:var(--ink)}
.chip:hover{border-color:var(--accent)}
.rows{list-style:none;padding:0;margin:14px 0;counter-reset:r;border-top:2px solid var(--ink)}.rows li{counter-increment:r;border-bottom:1px solid var(--line)}
.rows a{display:grid;grid-template-columns:44px 1fr;gap:2px 12px;padding:14px 4px;text-decoration:none;color:var(--ink)}
.rows a:before{content:counter(r,decimal-leading-zero);font:700 15px var(--fn);color:var(--accent);grid-row:1/3;align-self:center}
.rows b{font-size:17px;color:var(--link)}.rows span{color:var(--muted);font-size:14px}.rows a:hover{background:var(--surface)}
.hsplit{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:34px;align-items:start;margin-top:10px}
.hsplit aside{position:sticky;top:16px}.hsplit .grid{grid-template-columns:1fr}
.cols2{columns:2;column-gap:28px;padding-left:18px}.cols2 li{margin:5px 0;break-inside:avoid}
.homet td:first-child{font-weight:650}.homet a{text-decoration:none}
.note:empty,.note:has(>a[hidden]){display:none}
/* footers */
.d-f-dark footer,.d-f-accent footer{background:var(--brand);color:rgba(255,255,255,.78);border:0}
.d-f-dark footer .fh,.d-f-accent footer .fh{color:#fff}.d-f-dark footer a,.d-f-accent footer a{color:rgba(255,255,255,.8)}.d-f-dark footer a:hover,.d-f-accent footer a:hover{color:#fff}
.d-f-accent footer{border-top:6px solid var(--accent)}
.d-f-light footer{border-radius:calc(var(--r)*1.3) calc(var(--r)*1.3) 0 0;margin-top:48px}
.d-f-minimal footer{background:transparent;border-top:2px solid var(--ink);font-size:13.5px}
.d-f-center footer{text-align:center}.d-f-center .fcols{justify-items:center}
/* h2 styles */
.d-s-bar .prose h2{border-left:5px solid var(--accent);padding-left:12px}
.d-s-rule .prose h2{font-size:15px;text-transform:uppercase;letter-spacing:.1em;border-bottom:2px solid var(--ink);padding-bottom:6px}
.d-s-double .prose h2{border-bottom:3px double var(--line);padding-bottom:6px}
.d-s-dot .prose h2:before{content:"";display:inline-block;width:.5em;height:.5em;border-radius:50%;background:var(--accent);margin-right:.5em;vertical-align:.1em}
.d-s-pipe .prose h2{border-left:4px solid var(--accent);padding:4px 0 4px 12px}
.d-s-plain .prose h2{font-weight:800}
/* tables */
.d-t-zebra .tbl th{background:var(--brand);color:#fff;border-bottom:0;text-align:left}.d-t-zebra .tbl tbody tr:nth-child(even) td{background:var(--surface)}.d-t-zebra .tbl tbody tr:nth-child(odd) td{background:color-mix(in srgb,var(--accent) 5%,transparent)}
.d-t-grid .tbl{border:1.5px solid var(--ink)}.d-t-grid .tbl th,.d-t-grid .tbl td{border:1px solid var(--line)}.d-t-grid .tbl th{background:var(--bg);text-transform:uppercase;font-size:12px;letter-spacing:.06em}
.d-t-ruled .tbl{border-top:3px double var(--ink);border-bottom:3px double var(--ink)}.d-t-ruled .tbl th{background:transparent;border-bottom:2px solid var(--ink);font-style:italic}.d-t-ruled .tbl td{border-bottom:1px dotted var(--line)}
.d-t-soft .tbl{border-collapse:separate;border-spacing:0 6px}.d-t-soft .tbl td{background:var(--surface);border:0;padding:12px 14px}.d-t-soft .tbl td:first-child{border-radius:14px 0 0 14px}
.d-t-soft .tbl td:last-child{border-radius:0 14px 14px 0}.d-t-soft .tbl th{background:transparent;border:0;color:var(--muted);text-transform:uppercase;font-size:11.5px;letter-spacing:.08em}
.d-t-stripe .tbl th{background:var(--brand);color:#fff;text-transform:uppercase;font-size:11.5px;letter-spacing:.08em;border-bottom:0}.d-t-stripe .tbl tbody tr{border-bottom:1px solid var(--line)}.d-t-stripe .tbl tbody tr:nth-child(odd) td{background:color-mix(in srgb,var(--accent) 7%,transparent)}.d-t-stripe .tbl td{border:0}
/* buttons */
.d-b-pill .cta,.d-b-pill .btn2{border-radius:999px}
.d-b-square .cta{text-transform:uppercase;letter-spacing:.08em;font-size:14.5px}.d-b-square .cta,.d-b-square .btn2{border-radius:0}
/* background */
.d-x-blueprint{background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:26px 26px}
.d-x-dots{background-image:radial-gradient(var(--grid) 1.3px,transparent 1.6px);background-size:20px 20px}
.d-x-hex{background-image:radial-gradient(var(--grid) 1.5px,transparent 2px),radial-gradient(var(--grid) 1.5px,transparent 2px);background-size:30px 52px;background-position:0 0,15px 26px}
.d-x-wood{background-image:repeating-linear-gradient(90deg,transparent 0 46px,var(--grid) 46px 47px),repeating-linear-gradient(0,transparent 0 160px,color-mix(in srgb,var(--grid) 70%,transparent) 160px 161px)}
.d-x-circuit{background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px),radial-gradient(color-mix(in srgb,var(--accent) 40%,transparent) 2px,transparent 2.5px);background-size:48px 48px,48px 48px,48px 48px;background-position:0 0,0 0,0 0}
/* cards */
.d-k-lift .card{box-shadow:0 2px 0 var(--line),0 8px 18px -12px rgba(0,0,0,.25)}.d-k-lift .card:hover{transform:translateY(-2px)}
.d-k-tab .card{border-left:6px solid var(--accent)}
.d-k-flat .card{background:transparent;border:0;border-top:2px solid var(--ink);border-radius:0;padding:12px 2px}
@media(max-width:760px){.hsplit{grid-template-columns:1fr}.hsplit aside{position:static}.cols2{columns:1}.d-c-ledger .fld input,.d-c-ledger .fld select{flex:1 1 100%;width:100%}.hhero{padding:22px 16px}}
.d-h-bar .hdr{border-bottom:3px solid var(--accent);box-shadow:0 1px 0 color-mix(in srgb,var(--accent) 40%,transparent)}.d-h-bar .logo{font-family:var(--fh);font-weight:700;letter-spacing:.06em}h1{text-transform:uppercase;letter-spacing:.03em;border-bottom:2px solid var(--accent);padding-bottom:10px;display:inline-block}.prose h2{font-family:var(--fh);text-transform:uppercase;letter-spacing:.08em;font-size:16px;border-left:4px solid var(--accent);padding:4px 0 4px 12px;background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 10%,transparent),transparent)}.d-c-dark .calc{box-shadow:0 8px 28px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.04)}.d-c-dark .res .n{color:var(--accent);text-shadow:0 0 12px color-mix(in srgb,var(--accent) 40%,transparent);font-family:var(--fn)}.tbl th{background:var(--brand);color:#fff;font-family:var(--fh);text-transform:uppercase;letter-spacing:.06em}.tbl tbody tr{border-bottom:1px solid var(--line)}.tbl tbody tr:nth-child(odd) td{background:color-mix(in srgb,var(--accent) 6%,var(--surface))}