:root{--ink:#16140f;--paper:#f4efe4;--paper2:#ece4d3;--diesel:#b8772a;--diesel-dark:#8a5418;
    --volt:#1faa6e;--volt-dark:#137a4d;--volt-light:#d7f2e5;--line:#d8cdb6;--muted:#736b58;
    --road:#26231c;--red:#a11c1c;--amber-light:#fbf0d9;
    --sans:'Barlow',-apple-system,sans-serif;--cond:'Barlow Condensed',sans-serif;}
  *{box-sizing:border-box;margin:0;padding:0}
  html{-webkit-text-size-adjust:100%}
  body{font-family:var(--sans);color:var(--ink);line-height:1.5;min-height:100vh;display:flex;flex-direction:column;
    background:radial-gradient(110% 70% at 85% -5%, rgba(31,170,110,.12), transparent 55%),linear-gradient(180deg,var(--paper),var(--paper2));}
  .wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 16px}
  .topbar{background:var(--road);color:#f4efe4;padding:11px 0;border-bottom:4px solid var(--diesel)}
  .topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
  .brand{font-family:var(--cond);font-weight:900;font-size:23px;letter-spacing:.02em;text-transform:uppercase;color:#f4efe4;text-decoration:none}
  .brand .plug{color:var(--volt)}
  .topbar nav a{color:#cdbf9f;text-decoration:none;font-size:14px}
  .topbar nav a:hover{color:#fff}
  main{flex:1}
  .hero{padding:28px 0 6px}
  .kicker{font-family:var(--cond);font-weight:700;text-transform:uppercase;letter-spacing:.12em;font-size:13.5px;color:var(--diesel-dark)}
  h1{font-family:var(--cond);font-weight:900;font-size:clamp(30px,5.4vw,50px);line-height:1.02;text-transform:uppercase;margin:8px 0 0}
  .lede{font-size:17px;color:#534c3d;margin:12px 0 0;max-width:70ch}
  h2{font-family:var(--cond);font-weight:900;text-transform:uppercase;font-size:26px;line-height:1.05;margin:34px 0 8px}
  p{margin:0 0 10px;max-width:72ch}
  a{color:var(--volt-dark)}

  .grid{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;margin-top:18px}
  @media (min-width:960px){ .grid{grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);align-items:start}
    .result{position:sticky;top:12px} }
  .card{background:#fff;border:1.5px solid var(--line);border-radius:14px;padding:16px 18px}
  .card + .card, details.card{margin-top:12px}
  .card h3{font-family:var(--cond);font-weight:900;text-transform:uppercase;font-size:20px;letter-spacing:.02em;margin:0 0 6px}
  .card h3 .d{color:var(--diesel-dark)} .card h3 .e{color:var(--volt-dark)}
  details.card summary{cursor:pointer;font-family:var(--cond);font-weight:900;text-transform:uppercase;font-size:20px;list-style-position:inside}
  details.card summary small{display:block;font-family:var(--sans);font-weight:400;text-transform:none;font-size:14px;color:var(--muted);margin:2px 0 0 18px}
  details.card[open] summary{margin-bottom:6px}

  .fld{padding:10px 0;border-top:1px solid #efe8d8}
  .fld:first-of-type{border-top:0}
  .fld label{display:block;font-weight:700;font-size:15px}
  .fld .row{display:flex;align-items:center;gap:12px;margin-top:6px}
  .fld input[type=range]{flex:1;min-width:0;accent-color:var(--volt-dark);height:28px}
  .num{display:flex;align-items:center;gap:4px;flex:0 0 auto;border:1.5px solid var(--line);border-radius:9px;padding:4px 8px;background:#fffdf8}
  .num input{width:84px;border:0;background:transparent;font:700 16px/1.2 var(--sans);text-align:right;color:var(--ink);font-variant-numeric:tabular-nums}
  .num input:focus{outline:none}
  .num:focus-within{border-color:var(--volt-dark)}
  .num .pre,.num .unit{font-size:14px;color:var(--muted);white-space:nowrap}
  .fld .unitline{font-size:13.5px;color:var(--muted);margin-top:2px}
  .fld .hint{font-size:13.5px;color:var(--muted);margin-top:4px}
  .avg{margin-top:6px;font-size:15px}
  .avg b{color:var(--volt-dark)}
  select{font:600 15px/1.2 var(--sans);padding:8px 10px;border:1.5px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);width:100%;margin-top:6px}
  .seg{display:inline-flex;flex-wrap:wrap;gap:4px;margin-top:6px;border:1px solid #b9ae95;border-radius:10px;padding:3px;background:#fff}
  .seg button{border:0;background:transparent;font:600 14px/1.2 var(--sans);color:#4d473a;padding:8px 11px;border-radius:7px;cursor:pointer;min-height:36px}
  .seg button.on{background:var(--road);color:#fff}
  .pick{margin:2px 0 10px}
  .pick .lbl{display:block;font-family:var(--cond);font-weight:700;text-transform:uppercase;letter-spacing:.06em;font-size:13px;color:var(--volt-dark)}
  .pick .seg{display:flex}
  .pick .seg button{flex:1 1 auto}
  .pick .hint{font-size:13px;color:var(--muted);margin-top:4px}

  table.sum{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
  table.sum th,table.sum td{padding:9px 8px;border-bottom:1px solid #efe8d8;text-align:right;vertical-align:top}
  table.sum th:first-child,table.sum td:first-child{text-align:left;padding-left:0}
  table.sum thead th{font-family:var(--cond);text-transform:uppercase;letter-spacing:.05em;font-size:15px;border-bottom:2px solid var(--road)}
  table.sum thead th.d{color:var(--diesel-dark)} table.sum thead th.e{color:var(--volt-dark)}
  table.sum td{font-size:16px}
  table.sum td:first-child{font-weight:700;font-size:15px}
  table.sum td small{display:block;font-size:12px;color:var(--muted);font-weight:400;line-height:1.3;margin-top:2px}
  table.sum tr.tot td{border-top:2px solid var(--road);border-bottom:0;font-weight:800;font-size:18px}
  table.sum tr.extra td:first-child{font-weight:600}
  .out{list-style:none;margin:14px 0 0}
  .out li{position:relative;padding:0 0 8px 28px;font-size:16px}
  .out li::before{content:'👉';position:absolute;left:0;top:0}
  .out li b{color:var(--volt-dark)}
  .out li.bad b{color:var(--red)}
  .acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
  .btn{border:1.5px solid var(--volt-dark);background:var(--volt-dark);color:#fff;font:700 15px/1.2 var(--sans);padding:11px 16px;border-radius:10px;cursor:pointer;min-height:44px}
  .btn.ghost{background:#fff;color:var(--volt-dark)}
  .btn.plain{background:transparent;border-color:var(--line);color:var(--muted)}
  .flash{font-size:14px;color:var(--volt-dark);align-self:center}

  .be{list-style:none;margin:6px 0 0}
  .be li{padding:9px 0;border-top:1px solid #efe8d8;font-size:16px}
  .be li:first-child{border-top:0}
  .be li b{color:var(--volt-dark)}
  .tblwrap{overflow-x:auto;border:1.5px solid var(--line);border-radius:14px;background:#fff;margin:10px 0 4px}
  table.sens{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums;min-width:480px}
  table.sens th,table.sens td{padding:8px 10px;text-align:right;border-bottom:1px solid #efe8d8;font-size:15px;white-space:nowrap}
  table.sens th:first-child,table.sens td:first-child{text-align:left}
  table.sens thead th{background:var(--road);color:#f4efe4;font-family:var(--cond);text-transform:uppercase;letter-spacing:.05em;font-size:13.5px}
  table.sens tr.cur td{background:var(--volt-light);font-weight:800}
  table.sens td.neg{color:var(--red)}
  .note{font-size:14px;color:var(--muted)}

  .bar{position:fixed;left:0;right:0;bottom:0;background:var(--road);color:#f4efe4;padding:10px 16px calc(10px + env(safe-area-inset-bottom));
    display:flex;justify-content:space-between;gap:10px;font-size:14.5px;z-index:5;box-shadow:0 -4px 14px rgba(0,0,0,.18)}
  .bar b{color:#7fe0b2}
  .bar.bad b{color:#f3a6a6}
  @media (min-width:960px){ .bar{display:none} }
  @media (max-width:959px){ body{padding-bottom:64px} .result{order:-1} }

  footer{margin-top:36px;background:var(--road);color:#a99e85;padding:22px 0 30px;font-size:13px}
  footer .wrap{display:flex;flex-direction:column;gap:6px}
  footer b{color:#e8e0cf}
  footer a{color:var(--volt)}
  @media (max-width:420px){ .num input{width:72px} .fld .row{gap:8px} table.sum td{font-size:15px} }