:root{
  --bg:#f2f4f6; --panel:#fff; --ink:#15202b; --muted:#5b6774; --line:#d9dee4;
  --denim:#2c4a6e; --tape:#f0c02e; --tape-ink:#2a2208;
  --c1:#2c4a6e; --c2:#5f86b0; --c3:#9bb5d1; --c4:#c9a227; --c5:#8a5a44; --c6:#6b7f6e; --c7:#b9c2cc;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#10161d; --panel:#18212b; --ink:#e9eef3; --muted:#9aa7b4; --line:#2b3745; --denim:#7fa3cc; --tape:#e8b92a; --tape-ink:#221b05;
    --c1:#7fa3cc; --c2:#5f86b0; --c3:#3f5d7e; --c4:#c9a227; --c5:#a8745a; --c6:#7f9582; --c7:#55626f; color-scheme:dark}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.top{max-width:1100px;margin:0 auto;padding:2rem 1.25rem 1rem}
.top h1{margin:0 0 .35rem;font-size:clamp(1.8rem,4vw,2.6rem);letter-spacing:-.02em;line-height:1.1}
.top p{margin:0;max-width:62ch;color:var(--muted)}
.layout{max-width:1100px;margin:0 auto;padding:0 1.25rem 2rem;display:grid;gap:1.25rem;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);align-items:start}
@media (max-width:860px){.layout{grid-template-columns:1fr}}
fieldset{background:var(--panel);border:1px solid var(--line);border-radius:6px;margin:0 0 1rem;padding:.9rem 1rem 1rem}
legend{font-weight:700;padding:0 .4rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.75rem}
.grid .wide{grid-column:1/-1}
  .custom{display:grid;grid-template-columns:2fr 1fr 1fr;gap:.6rem;margin-top:.7rem}
@media (max-width:520px){.custom{grid-template-columns:1fr 1fr}.custom label:first-child{grid-column:1/-1}}
label{display:flex;flex-direction:column;gap:.25rem;font-size:.88rem;color:var(--muted)}
input,select{font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:.5rem .6rem;width:100%}
input:focus-visible,select:focus-visible,button:focus-visible{outline:3px solid var(--tape);outline-offset:1px}
.hint{margin:.6rem 0 0;font-size:.82rem;color:var(--muted);max-width:68ch}
.results{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:1rem;position:sticky;top:1rem}
@media (max-width:860px){.results{position:static}}
.hero{background:var(--tape);color:var(--tape-ink);border-radius:4px;padding:.9rem 1rem;display:flex;flex-direction:column;
  background-image:repeating-linear-gradient(90deg,transparent 0 9px,rgba(0,0,0,.28) 9px 10px);background-size:100% 10px;background-repeat:no-repeat;background-position:top}
.hero .lab{font-size:.9rem;font-weight:600;padding-top:.5rem}
.hero strong{font-size:clamp(2.2rem,6vw,3.2rem);line-height:1.1;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.hero .sub{font-size:.85rem}
.tape{display:flex;height:16px;margin:1rem 0 .5rem;border-radius:3px;overflow:hidden;background:var(--line)}
.tape span{display:block;height:100%}
.legend{list-style:none;margin:0 0 1rem;padding:0;display:flex;flex-wrap:wrap;gap:.25rem 1rem;font-size:.8rem;color:var(--muted)}
.legend i{display:inline-block;width:.7rem;height:.7rem;border-radius:2px;margin-right:.35rem;vertical-align:-1px}
table{width:100%;border-collapse:collapse;font-size:.9rem;margin-bottom:1rem;font-variant-numeric:tabular-nums}
th,td{padding:.4rem .4rem;border-bottom:1px solid var(--line);text-align:left}
th{font-size:.8rem;color:var(--muted);font-weight:600}
.n{text-align:right}
tr.total td{font-weight:700;border-top:2px solid var(--ink)}
.actions{display:flex;flex-wrap:wrap;gap:.5rem}
button{font:inherit;font-weight:600;cursor:pointer;border:0;border-radius:4px;padding:.6rem .95rem;background:var(--denim);color:#fff}
@media (prefers-color-scheme:dark){button{color:#0d141b}}
button:hover{filter:brightness(1.1)}
button.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.status{min-height:1.4em;margin:.6rem 0 0;font-size:.85rem;color:var(--muted)}
footer{max-width:1100px;margin:0 auto;padding:0 1.25rem 2.5rem;color:var(--muted);font-size:.82rem}
footer p{max-width:75ch;margin:0}
button.primary{background:var(--tape);color:var(--tape-ink);padding:.75rem 1.6rem;font-size:1.05rem}
.calc-row{display:flex;flex-wrap:wrap;gap:.6rem;margin:0 0 1rem}
@media print{.actions,.status{display:none}.results{position:static;border:0}.inputs{display:none}.layout{display:block}}