:root{
  --paper:#f5f1e6; --sheet:#fffcf4; --ink:#15181d; --muted:#585d65; --line:#ddd5c2; --line-strong:#c9bfa7;
  --sun:#f2b100; --sun-ink:#8a5d00; --sun-soft:#fbecc0;
  --ok:#126b4f; --ok-soft:#dcefe5; --bad:#a8291f; --bad-soft:#f6dedb; --focus:#2457c5;
  --dash:#171b21; --dash-2:#222830; --dash-ink:#f3eedf; --dash-dim:#8f96a0; --dash-glow:#ffc531; --dash-line:#323a45;
  --f-head:"Bricolage Grotesque","Arial Narrow",Arial,sans-serif;
  --f-body:"Public Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-num:"Martian Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root{
  --paper:#101215; --sheet:#171a1e; --ink:#efeadd; --muted:#a8ada3; --line:#2c3138; --line-strong:#3c434c;
  --sun:#ffc531; --sun-ink:#ffd25e; --sun-soft:#3a2f10;
  --ok:#5fc69b; --ok-soft:#14322a; --bad:#ff8b7d; --bad-soft:#3a1b18; --focus:#8fb1ff;
  --dash:#0b0d10; --dash-2:#14181d; --dash-line:#262c34; color-scheme:dark}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.6 var(--f-body)}
a{color:inherit;text-decoration-color:var(--sun);text-decoration-thickness:2px;text-underline-offset:.2em}
a:hover{text-decoration-color:var(--ink)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
h1,h2,h3{font-family:var(--f-head);font-weight:800;line-height:1.05;letter-spacing:-.02em;margin:0;text-wrap:balance}
h1{font-size:clamp(2.3rem,6.4vw,4.4rem)}
h2{font-size:clamp(1.55rem,3.6vw,2.3rem)}
h3{font-size:1.2rem;letter-spacing:-.01em}
p{margin:0}
.wrap{max-width:74rem;margin:0 auto;padding-inline:clamp(1rem,4vw,2.25rem)}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.num{font-family:var(--f-num);font-variant-numeric:tabular-nums}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;z-index:9;background:var(--sheet);padding:.5rem 1rem}

/* header */
.top{border-bottom:1px solid var(--line)}
.top .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.7rem 1.5rem;padding-block:.9rem}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;font:800 1.35rem/1 var(--f-head);letter-spacing:-.02em}
.brand svg{flex:none}
.nav{display:flex;flex-wrap:wrap;gap:.25rem 1.2rem;font-weight:600;font-size:.98rem}
.nav a{text-decoration:none;padding:.2rem 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a[aria-current]{border-color:var(--sun)}
@media (max-width:560px){.nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.4rem;width:100%}
  .nav a{background:var(--sheet);border:1px solid var(--line);border-radius:10px;padding:.5rem .3rem;text-align:center;font-size:.9rem}}

main{padding-block:1.6rem 4rem}
.stack{display:grid;gap:clamp(2.6rem,6vw,4.4rem)}
.crumbs{font-size:.9rem;color:var(--muted)}
.crumbs a{color:var(--muted)}
.lede{font-size:clamp(1.1rem,2.1vw,1.28rem);color:var(--muted);max-width:40rem;margin-top:.9rem}
.kicker{font:600 .82rem/1 var(--f-num);letter-spacing:.06em;text-transform:uppercase;color:var(--sun-ink)}
.src-line{font-size:.9rem;color:var(--muted);margin-top:.7rem}

/* hero */
.hero{display:grid;gap:2rem;align-items:start;grid-template-columns:minmax(0,1fr)}
@media (min-width:980px){.hero{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:2.6rem}}
.hero-text{display:grid;gap:1rem;align-content:start}
.hero h1 em{font-style:normal;background:linear-gradient(transparent 62%,var(--sun) 62%,var(--sun) 92%,transparent 92%);padding-inline:.06em}
.facts-strip{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.4rem}
.facts-strip span{font:600 .85rem/1 var(--f-num);border:1px solid var(--line-strong);border-radius:999px;padding:.45rem .7rem;background:var(--sheet)}

/* the calculator: an in-home display */
.calc{background:var(--dash);color:var(--dash-ink);border-radius:22px;padding:clamp(1rem,3vw,1.5rem);display:grid;gap:1.1rem;box-shadow:0 1px 0 var(--dash-line) inset,0 18px 40px -24px rgba(0,0,0,.55)}
.calc a{color:var(--dash-ink)}
.display{background:var(--dash-2);border:1px solid var(--dash-line);border-radius:14px;padding:1rem 1.1rem;display:grid;gap:.8rem}
.display-top{display:flex;justify-content:space-between;gap:1rem;font:500 .74rem/1.3 var(--f-num);letter-spacing:.06em;text-transform:uppercase;color:var(--dash-dim)}
.readouts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,7.5rem),1fr));gap:.8rem 1.2rem}
.readout{display:grid;gap:.15rem}
.readout b{font:600 clamp(1.9rem,5.2vw,2.9rem)/1 var(--f-num);color:var(--dash-glow);letter-spacing:-.04em;font-variant-numeric:tabular-nums}
.readout.sm b{font-size:clamp(1.35rem,3.4vw,1.75rem);color:var(--dash-ink)}
.readout small{font:500 .78rem/1.3 var(--f-body);color:var(--dash-dim)}
.bars{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:4px;align-items:end;height:92px;padding-top:.3rem}
.bars i{display:block;background:linear-gradient(var(--dash-glow),#d58a00);border-radius:3px 3px 1px 1px;min-height:2px;position:relative}
.bars-x{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:4px;font:500 .66rem/1 var(--f-num);color:var(--dash-dim);text-align:center}
.calc-msg{font-size:.9rem;color:var(--dash-dim)}
.calc-msg.warn{color:#ffb2a6}
.controls{display:grid;gap:1rem}
.ctl{display:grid;gap:.45rem}
.ctl > label,.ctl > .lbl{font:600 .78rem/1.2 var(--f-num);letter-spacing:.05em;text-transform:uppercase;color:var(--dash-dim)}
.row{display:flex;gap:.5rem;flex-wrap:wrap}
.calc input[type=text],.calc input[type=number],.calc select{font:500 1.05rem var(--f-body);color:var(--dash-ink);background:var(--dash-2);border:1px solid var(--dash-line);border-radius:10px;padding:.65rem .75rem;min-width:0}
.calc input[type=text]{flex:1 1 9rem;text-transform:uppercase;letter-spacing:.04em}
.btn{font:700 1rem var(--f-body);border:0;border-radius:10px;padding:.68rem 1rem;background:var(--sun);color:#1b1500;cursor:pointer;text-decoration:none;display:inline-block}
.btn:hover{filter:brightness(1.06)}
.btn.ghost{background:transparent;color:inherit;border:1px solid currentColor}
.compass{display:grid;grid-template-columns:repeat(3,3.1rem);grid-template-rows:repeat(3,2.6rem);gap:.35rem;justify-content:start}
.compass button{font:700 .85rem var(--f-num);background:var(--dash-2);color:var(--dash-ink);border:1px solid var(--dash-line);border-radius:9px;cursor:pointer}
.compass button[aria-pressed=true]{background:var(--sun);color:#1b1500;border-color:var(--sun)}
.compass .hub{display:grid;place-items:center;font:500 .62rem/1.1 var(--f-num);color:var(--dash-dim);text-align:center}
.split{display:grid;grid-template-columns:auto minmax(0,1fr);gap:1rem 1.4rem;align-items:start}
@media (max-width:520px){.split{grid-template-columns:minmax(0,1fr)}}
.tilts{display:grid;gap:.35rem}
.tilts label{display:flex;align-items:center;gap:.55rem;font-size:.95rem;cursor:pointer;padding:.42rem .6rem;border:1px solid var(--dash-line);border-radius:9px;background:var(--dash-2)}
.tilts input{accent-color:var(--sun)}
.tilts label:has(input:checked){border-color:var(--sun)}
.tilt-ico{width:34px;height:20px;flex:none}
.more{border-top:1px solid var(--dash-line);padding-top:.9rem}
.more summary{cursor:pointer;font:600 .85rem var(--f-num);letter-spacing:.04em;text-transform:uppercase;color:var(--dash-dim)}
.more[open] summary{margin-bottom:.9rem}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,13rem),1fr));gap:1rem}
.range{display:grid;grid-template-columns:minmax(0,1fr) 4.2rem;gap:.6rem;align-items:center}
.range input{accent-color:var(--sun);width:100%}
.range output{font:600 .95rem var(--f-num);text-align:right}
.hint{font-size:.82rem;color:var(--dash-dim)}

/* sections and content */
section{display:grid;gap:1rem}
.sec-head{display:grid;gap:.5rem;max-width:46rem}
.prose{display:grid;gap:1rem;max-width:44rem}
.prose ul,.prose ol{margin:0;padding-left:1.25rem;display:grid;gap:.45rem}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,12.5rem),1fr));gap:.9rem}
@media (min-width:860px){.tiles.three{grid-template-columns:repeat(3,minmax(0,1fr))}}
.nw{white-space:nowrap}
th.n{text-align:right}
.calc input::placeholder{text-transform:none;letter-spacing:0;color:var(--dash-dim)}
.tile{background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:1.1rem 1.15rem;display:grid;gap:.45rem;align-content:start}
.tile .big{font:700 1.7rem/1 var(--f-num);letter-spacing:-.03em;color:var(--sun-ink)}
.tile p{color:var(--muted);font-size:.98rem}
a.tile{text-decoration:none}
a.tile:hover{border-color:var(--ink)}
.by{display:block;font-size:.8rem;color:var(--muted);margin-top:.15rem}
.steps{list-style:none;margin:0;padding:0;counter-reset:s;display:grid;gap:.9rem;max-width:44rem}
.steps li{counter-increment:s;display:grid;grid-template-columns:2.4rem minmax(0,1fr);gap:.8rem;align-items:start}
.steps li::before{content:counter(s);display:grid;place-items:center;width:2.4rem;height:2.4rem;border-radius:50%;background:var(--sun);color:#1b1500;font:700 1rem var(--f-num)}
.note{border-left:5px solid var(--sun);background:var(--sheet);padding:1rem 1.2rem;border-radius:0 12px 12px 0;max-width:46rem;display:grid;gap:.5rem}
.warnbox{border-left-color:var(--bad)}
.table{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--sheet)}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{text-align:left;padding:.65rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font:600 .74rem/1.2 var(--f-num);letter-spacing:.05em;text-transform:uppercase;color:var(--muted);background:var(--paper);position:sticky;top:0}
tr:last-child td{border-bottom:0}
td.n{font-family:var(--f-num);white-space:nowrap;text-align:right}
td.ref{font:500 .8rem var(--f-num);color:var(--muted);white-space:nowrap}
.pill{display:inline-block;font:700 .72rem/1 var(--f-num);letter-spacing:.04em;text-transform:uppercase;padding:.35rem .5rem;border-radius:6px;white-space:nowrap}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
.pill.bad{background:var(--bad-soft);color:var(--bad)}

/* kit checker */
.checker{background:var(--sheet);border:2px solid var(--ink);border-radius:18px;padding:clamp(1rem,3vw,1.4rem);display:grid;gap:.9rem}
.checker label{font-weight:700}
.checker input{font:500 1.1rem var(--f-body);color:var(--ink);background:var(--paper);border:1px solid var(--line-strong);border-radius:10px;padding:.75rem .85rem;width:100%}
.results{display:grid;gap:.5rem}
.res{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.4rem .8rem;align-items:start;padding:.7rem .8rem;border-radius:12px;background:var(--paper);border:1px solid var(--line)}
.res b{display:block}
.res small{color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:.4rem}
.chip{font:600 .85rem var(--f-body);border:1px solid var(--line-strong);background:var(--sheet);border-radius:999px;padding:.38rem .7rem;cursor:pointer;color:var(--ink)}
.chip[aria-pressed=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.chip small{font-family:var(--f-num);opacity:.7}
.filters{display:grid;gap:.8rem}
.filters input{font:500 1rem var(--f-body);color:var(--ink);background:var(--sheet);border:1px solid var(--line-strong);border-radius:10px;padding:.65rem .8rem;width:100%;max-width:28rem}
.count{font:600 .9rem var(--f-num);color:var(--muted)}

details.q{border-bottom:1px solid var(--line);padding:.85rem 0}
details.q summary{cursor:pointer;font-weight:700}
details.q p{margin-top:.5rem;color:var(--muted);max-width:44rem}
.sources ol{margin:0;padding-left:1.2rem;display:grid;gap:.35rem;font-size:.92rem}
.sources p{font-size:.9rem;color:var(--muted)}

footer{border-top:1px solid var(--line);font-size:.93rem;color:var(--muted)}
footer .wrap{display:grid;gap:1.2rem;padding-block:2rem 2.6rem}
.foot-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,12rem),1fr));gap:1.2rem}
.foot-cols h2{font:700 .95rem var(--f-body);color:var(--ink);letter-spacing:0;margin-bottom:.4rem}
.foot-cols ul{list-style:none;margin:0;padding:0;display:grid;gap:.3rem}

.factlist{list-style:none;margin:0;padding:0;display:grid;gap:.85rem;max-width:44rem}
.factlist li{border-left:4px solid var(--line-strong);padding:.15rem 0 .15rem 1rem}
.note ul.prose{margin:0}