:root{
  --paper:#EDF0F1; --panel:#FFFFFF; --ink:#16212B; --steel:#55636F; --rule:#C9D1D6;
  --cable:#1F5FAF; --cable-ink:#FFFFFF; --signal:#F2B705; --housing:#1D2830; --housing-edge:#33424D;
  --focus:#F2B705;
  --font:"Barlow",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-cond:"Barlow Semi Condensed","Barlow",system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#121A20;--panel:#18222A;--ink:#E4EAED;--steel:#9AA8B2;--rule:#2C3A44;--cable:#6FA6EC;--cable-ink:#0E1820;--housing:#0B1116;--housing-edge:#2C3A44;}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:1.0625rem;line-height:1.55}
a{color:var(--cable)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
img{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 1.25rem}

/* header */
.site-head{border-bottom:1px solid var(--rule)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);font-family:var(--font-cond);font-weight:700;font-size:1.3rem;letter-spacing:.01em}
.brand svg{width:28px;height:28px;flex:none}
.site-nav{display:flex;gap:1.25rem}
.site-nav a{color:var(--ink);text-decoration:none;font-weight:500}
.site-nav a:hover{text-decoration:underline}

/* type */
h1,h2,h3{font-family:var(--font-cond);line-height:1.1;margin:0 0 .6em}
h1{font-size:clamp(2.1rem,5vw,3.4rem);font-weight:700;letter-spacing:-.01em}
h2{font-size:1.7rem;font-weight:600;margin-top:2.2em}
h3{font-size:1.25rem;font-weight:600;margin-top:1.6em}
p{margin:0 0 1em}
.lede{font-size:1.2rem;color:var(--steel);max-width:34em}
.muted{color:var(--steel)}
.prose{max-width:44rem}
.prose li{margin-bottom:.4em}

/* hero */
.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:3rem;align-items:center;padding:4rem 0 3.5rem}
@media (max-width:860px){.hero{grid-template-columns:1fr;gap:2rem;padding:2.5rem 0}}

/* the panel meter: the one bold element */
.meter{background:var(--housing);border:1px solid var(--housing-edge);border-radius:14px;padding:1.4rem 1.5rem 1.3rem;color:#DCE4E8;box-shadow:inset 0 1px 0 rgba(255,255,255,.06)}
.meter-caption{font-size:.95rem;color:#A9B6BE;margin:0 0 .35rem}
.meter-value{font-family:var(--font-cond);font-weight:700;font-variant-numeric:tabular-nums;color:var(--signal);font-size:clamp(2.6rem,7vw,4.2rem);line-height:1;margin:0;word-break:break-word}
.meter-value small{font-size:.38em;font-weight:600;color:#DCE4E8;margin-left:.35em}
.meter-sub{margin:.6rem 0 0;color:#A9B6BE;font-size:.95rem}
.meter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.9rem 1.2rem;margin-top:1.2rem;padding-top:1.1rem;border-top:1px solid var(--housing-edge)}
.meter-grid dt{font-size:.85rem;color:#A9B6BE}
.meter-grid dd{margin:0;font-family:var(--font-cond);font-weight:600;font-size:1.35rem;font-variant-numeric:tabular-nums;color:#F1F5F7}
.meter input[type=range]{width:100%;accent-color:var(--signal);margin:1rem 0 .2rem}
.meter label{color:#DCE4E8}

/* calculators list */
.calc-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--rule)}
.calc-list li{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;padding:.95rem 0;border-bottom:1px solid var(--rule)}
.calc-list a{font-weight:600;font-size:1.1rem}
.calc-list .soon{color:var(--steel)}
.calc-list .status{font-size:.95rem;color:var(--steel);text-align:right;max-width:26rem}
@media (max-width:640px){.calc-list li{flex-direction:column;gap:.2rem}.calc-list .status{text-align:left}}
.calc-list .live{color:var(--cable);font-weight:600}

/* calculator layout */
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,26rem);gap:2.5rem;align-items:start;margin:1.5rem 0 1rem}
.calc .meter{position:sticky;top:1rem}
@media (max-width:900px){.calc{grid-template-columns:minmax(0,1fr)}.calc .meter{position:static}}
.form{background:var(--panel);border:1px solid var(--rule);border-radius:10px;padding:1.4rem}
.field{margin-bottom:1.15rem}
.field:last-child{margin-bottom:0}
.field > label,.field legend{display:block;font-weight:600;margin-bottom:.35rem}
.field .hint{font-size:.9rem;color:var(--steel);margin:.3rem 0 0}
fieldset.field{border:0;padding:0;margin-left:0;margin-right:0}
.row{display:flex;gap:.5rem}
.row > input{flex:1;min-width:0}
input[type=number],input[type=text],select{font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--rule);border-radius:6px;padding:.55rem .7rem;min-height:44px}
select{padding-right:.4rem;max-width:100%;min-width:0}
.row > select{flex:0 1 auto;max-width:55%}
.chips{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.5rem}
.chips button{font:inherit;font-size:.9rem;background:transparent;color:var(--ink);border:1px solid var(--rule);border-radius:999px;padding:.3rem .75rem;cursor:pointer;min-height:36px}
.chips button[aria-pressed=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:520px){.two{grid-template-columns:1fr}}
.actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:1.2rem}
.btn{font:inherit;font-weight:600;border-radius:6px;padding:.6rem 1rem;cursor:pointer;min-height:44px;border:1px solid var(--signal);background:var(--signal);color:#16212B}
.btn.ghost{background:transparent;color:#DCE4E8;border-color:var(--housing-edge)}
.error{color:#B3261E;font-size:.9rem;margin:.3rem 0 0}
@media (prefers-color-scheme:dark){.error{color:#F2B8B5}}

/* formula + tables */
.formula{background:var(--panel);border:1px solid var(--rule);border-left:4px solid var(--signal);border-radius:6px;padding:1rem 1.2rem;overflow-x:auto;font-family:var(--font-cond);font-size:1.1rem}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:.5rem .7rem;border-bottom:1px solid var(--rule)}
th{font-weight:600}
details{border-bottom:1px solid var(--rule);padding:.8rem 0}
summary{cursor:pointer;font-weight:600}
.crumbs{font-size:.95rem;margin-top:1.5rem;color:var(--steel)}
.crumbs a{color:var(--steel)}

.site-foot{border-top:1px solid var(--rule);margin-top:4rem;padding:2rem 0;font-size:.92rem;color:var(--steel)}

@media print{
  .site-head,.site-foot,.actions,.chips,.no-print{display:none!important}
  body{background:#fff;color:#000}
  .calc{grid-template-columns:1fr}
  .meter{background:#fff;color:#000;border:2px solid #000}
  .meter-value,.meter-grid dd,.meter-caption,.meter-sub,.meter-grid dt{color:#000}
}