:root{
  --bg:#f1f7fb;--card:#fff;--ink:#10212e;--mute:#566b7a;--line:#d3e4f0;
  --brand:#38b6ff;--brand-d:#0b6aa8;--on-brand:#fff;--tint:#e3f3ff;--head:#fff;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0b161f;--card:#13222e;--ink:#e8f1f7;--mute:#93a9b8;--line:#243846;
    --brand:#38b6ff;--brand-d:#5cc4ff;--on-brand:#06202f;--tint:#16374b;--head:#0e202e}
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding-bottom:env(safe-area-inset-bottom)}
.top{background:var(--head);padding:12px 16px 14px;border-bottom:4px solid var(--brand);position:sticky;top:0;z-index:5}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px}
.logo{height:34px;width:auto;display:block}
h1{font-size:22px;margin:0;line-height:1.2;color:var(--ink)}
.sub{margin:2px 0 0;font-size:13px;color:var(--mute)}
#lang{width:auto;min-width:120px;font-size:14px;padding:7px 10px;border-radius:999px}
main{max-width:720px;margin:0 auto;padding:12px;display:grid;gap:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:10px}
.row2:last-child{margin-bottom:0}
.lbl{display:block;font-size:13px;font-weight:600;color:var(--mute);margin-bottom:6px}
.seg{display:flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{flex:1;padding:10px 6px;border:0;background:transparent;color:var(--ink);font:inherit;font-size:14px;cursor:pointer}
.seg button+button{border-inline-start:1px solid var(--line)}
.seg button.on{background:var(--brand);color:var(--on-brand);font-weight:700}
.field{padding:10px 0;border-bottom:1px solid var(--line)}
.field:last-child{border-bottom:0}
.field.hide{display:none}
.fh{display:flex;justify-content:space-between;align-items:center}
.tag{display:none;font-size:11px;background:var(--brand);color:var(--on-brand);border-radius:6px;padding:1px 7px;font-weight:600}
.field.calc .tag{display:inline-block}
.field.calc{background:var(--tint);margin:0 -14px;padding-inline:14px}
.fi{display:flex;align-items:center;gap:8px}
input[type=number],select{font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px;width:100%;direction:ltr;text-align:start}
.fi input[type=number]{font-size:22px;font-weight:600}
.field.calc input[type=number]{background:transparent;border-color:var(--brand);color:var(--brand-d)}
.unit{min-width:56px;color:var(--mute);font-size:15px}
.unitsel{width:auto;min-width:84px}
input[type=range]{width:100%;margin:10px 0 2px;accent-color:var(--brand);height:28px}
.result .big{font-size:42px;font-weight:700;color:var(--brand-d);line-height:1.1;direction:ltr;text-align:start}
.bigunit{font-size:16px;color:var(--mute);font-weight:500}
dl{margin:10px 0 0;display:grid;gap:6px}
dl>div{display:flex;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding-top:6px;font-size:14px}
dt{color:var(--mute)} dd{margin:0;font-weight:600;direction:ltr}
footer{max-width:720px;margin:0 auto;padding:8px 16px 28px;text-align:center}
.flogo{height:38px;width:auto}
.tag2{margin:6px 0;font-weight:600}
footer a{color:var(--brand-d);font-weight:600;text-decoration:none}
.note{font-size:12px;color:var(--mute);margin:8px 0}
.unit,.bigunit,dd{unicode-bidi:isolate;direction:ltr}
@media (min-width:1100px){
  main{max-width:1240px;grid-template-columns:1fr 1.05fr 1fr;grid-template-rows:auto 1fr;align-items:start}
  main>.card:nth-child(1){grid-column:1;grid-row:1}
  main>.card:nth-child(4){grid-column:1;grid-row:2}
  #inputs{grid-column:2;grid-row:1 / 3}
  main>.result{grid-column:3;grid-row:1 / 3}
  .top{padding-inline:max(16px,calc((100vw - 1240px)/2 + 12px))}
}