/* =========================================================================
   Design system compartilhado por todas as calculadoras.
   Sem dependências, sem build. Funciona por file:// e por http(s)://.
   ========================================================================= */

:root{
  --bg:#f4f5f7; --card:#ffffff; --ink:#15181d; --ink2:#5b6270; --line:#dfe3ea;
  --accent:#1f6feb; --accent-soft:#e8f0fe; --ok:#0f8b57; --warn:#b26a00; --bad:#c62828;
  --warn-bg:#fff6e5; --bad-bg:#fdecec; --ok-bg:#e8f6ef;
  --mono:ui-monospace,"Cascadia Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.08);
  --raio:12px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0f1319; --card:#161b23; --ink:#e7ebf2; --ink2:#98a2b3; --line:#2a323d;
    --accent:#4d94ff; --accent-soft:#16283f; --ok:#35c98a; --warn:#f0b64a; --bad:#ff6b6b;
    --warn-bg:#2a2114; --bad-bg:#2c1717; --ok-bg:#122720;
    --shadow:0 1px 2px rgba(0,0,0,.4);
  }
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font:14px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  padding:0 0 60px;
  -webkit-text-size-adjust:100%;
}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}
a{color:var(--accent)}

/* ---------------------------------------------------------------- chrome do site */
.topo{
  border-bottom:1px solid var(--line); background:var(--card);
  position:sticky; top:0; z-index:20; box-shadow:var(--shadow);
}
.topo .wrap{display:flex;align-items:center;gap:14px;min-height:54px;flex-wrap:wrap}
.marca{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15px;color:var(--ink);text-decoration:none;letter-spacing:-.2px}
.marca svg{width:24px;height:24px;flex:none}
.topo nav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.topo nav a{
  padding:6px 11px;border-radius:8px;text-decoration:none;color:var(--ink2);
  font-size:13px;font-weight:600;
}
.topo nav a:hover{background:var(--accent-soft);color:var(--accent)}
.topo nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent)}

.rodape{
  margin-top:34px;padding-top:18px;border-top:1px solid var(--line);
  color:var(--ink2);font-size:12.5px;line-height:1.7;
}

header.pagina{padding:26px 0 10px}
h1{font-size:22px;margin:0 0 4px;letter-spacing:-.3px}
h2{font-size:15px;margin:0 0 12px;letter-spacing:.02em;text-transform:uppercase;color:var(--ink2);font-weight:650}
h3{font-size:14px;margin:0 0 8px}
.sub{margin:0;color:var(--ink2);font-size:13px;max-width:72ch}

/* ---------------------------------------------------------------- blocos */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--raio);
  padding:16px;box-shadow:var(--shadow);margin-bottom:16px;
}
.paineis{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:16px;margin-bottom:16px}
.paineis .card{margin:0}

/* ---------------------------------------------------------------- formulários */
label{display:block;font-size:12px;color:var(--ink2);margin-bottom:4px;font-weight:600}
.campo{margin-bottom:11px}
.linha2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.linha3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}
input,select,button,textarea{font:inherit;color:var(--ink)}
input[type=text],input[type=number],input[type=search],select,textarea{
  width:100%;padding:7px 9px;border:1px solid var(--line);border-radius:8px;background:var(--bg);
  font-variant-numeric:tabular-nums;
}
input:focus,select:focus,textarea:focus,button:focus-visible,a:focus-visible{
  outline:2px solid var(--accent);outline-offset:-1px;border-color:transparent;
}
input:disabled,select:disabled{opacity:.35}
.dica{font-size:11.5px;color:var(--ink2);margin-top:6px;line-height:1.5}
.marcar{display:flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--ink2);cursor:pointer}
.marcar input{width:auto}

.resultado{
  margin-top:10px;padding:9px 11px;background:var(--accent-soft);border-radius:8px;
  font-size:12.5px;line-height:1.7;font-variant-numeric:tabular-nums;
}
.resultado b{font-family:var(--mono);font-weight:600}

/* ---------------------------------------------------------------- botões */
button,.botao{
  padding:7px 13px;border:1px solid var(--line);border-radius:8px;background:var(--card);
  cursor:pointer;font-size:13px;font-weight:550;box-shadow:var(--shadow);
  text-decoration:none;color:var(--ink);display:inline-block;
}
button:hover,.botao:hover{border-color:var(--accent);color:var(--accent)}
button.principal{background:var(--accent);color:#fff;border-color:var(--accent)}
button.principal:hover{opacity:.9;color:#fff}
button:disabled{opacity:.4;cursor:not-allowed}
button:disabled:hover{border-color:var(--line);color:var(--ink)}
.barra{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 4px}
.barra select,.barra input{width:auto}

/* ---------------------------------------------------------------- tabelas */
.rolagem{overflow-x:auto;margin:0 -4px;padding:0 4px}
table{border-collapse:collapse;width:100%;font-size:13px;font-variant-numeric:tabular-nums}
th,td{padding:7px 8px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
th{
  font-size:11px;text-transform:uppercase;letter-spacing:.03em;color:var(--ink2);
  font-weight:650;vertical-align:bottom;text-align:right;
}
th.e,td.e{text-align:left}
tbody tr:hover{background:var(--accent-soft)}
tfoot td{font-weight:650;border-top:2px solid var(--line);border-bottom:none}
td.calc{font-family:var(--mono);font-weight:600}
table.compacta td{padding:5px 6px}
table.compacta input,table.compacta select{padding:5px 7px;font-size:13px}
.l60{width:66px}.l78{width:80px}.l110{width:118px}

/* ---------------------------------------------------------------- avisos e indicadores */
.aviso{padding:9px 12px;border-radius:8px;margin-bottom:8px;font-size:13px;line-height:1.5}
.aviso.atencao{background:var(--warn-bg);color:var(--warn);border:1px solid color-mix(in srgb,var(--warn) 30%,transparent)}
.aviso.erro{background:var(--bad-bg);color:var(--bad);border:1px solid color-mix(in srgb,var(--bad) 30%,transparent)}
.aviso.certo{background:var(--ok-bg);color:var(--ok);border:1px solid color-mix(in srgb,var(--ok) 30%,transparent)}

.indicadores{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;margin-bottom:14px}
.indicador{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.indicador .rot{font-size:11px;text-transform:uppercase;letter-spacing:.03em;color:var(--ink2);font-weight:650}
.indicador .val{font-size:19px;font-weight:700;font-variant-numeric:tabular-nums;margin-top:2px;letter-spacing:-.3px}
.indicador .un{font-size:12px;font-weight:500;color:var(--ink2)}

.etiqueta{display:inline-block;padding:1px 7px;border-radius:99px;font-size:11px;font-weight:650;background:var(--accent-soft);color:var(--accent)}
.etiqueta.direta{background:var(--ok-bg);color:var(--ok)}
.marchatag{
  display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:22px;
  border-radius:6px;font-size:12px;font-weight:700;color:#fff;padding:0 6px;
}
.vazio{color:var(--ink2);opacity:.6}

/* ---------------------------------------------------------------- gráficos */
.grafico{overflow-x:auto}
.grafico svg{min-width:620px;width:100%;height:auto;display:block}
.legenda{display:flex;flex-wrap:wrap;gap:6px 14px;margin-top:10px;font-size:12px;color:var(--ink2)}
.legenda span{display:inline-flex;align-items:center;gap:5px}
.legenda i{width:14px;height:3px;border-radius:2px;display:inline-block}

/* ---------------------------------------------------------------- presets */
.presets{
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;
  padding:11px 13px;background:var(--accent-soft);border:1px solid var(--line);
  border-radius:var(--raio);margin-bottom:16px;
}
.presets .titulo{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.03em;color:var(--ink2)}
.presets .lista{display:flex;flex-wrap:wrap;gap:6px;flex:1 1 260px;min-width:0}
.presets .lista:empty::after{content:"nenhum preset salvo ainda";color:var(--ink2);font-size:12.5px;font-style:italic}
.chip{
  display:inline-flex;align-items:center;gap:0;border:1px solid var(--line);
  border-radius:99px;background:var(--card);overflow:hidden;box-shadow:var(--shadow);
}
.chip b{padding:5px 4px 5px 12px;font-size:12.5px;font-weight:600;cursor:pointer;white-space:nowrap}
.chip:hover{border-color:var(--accent)}
.chip.ativo{border-color:var(--accent);background:var(--accent);}
.chip.ativo b{color:#fff}
.chip .x{
  border:none;background:none;box-shadow:none;padding:5px 9px 5px 5px;
  font-size:14px;line-height:1;color:var(--ink2);cursor:pointer;
}
.chip.ativo .x{color:#fff;opacity:.75}
.chip .x:hover{color:var(--bad);border:none}
.chip.ativo .x:hover{color:#fff;opacity:1}

/* ---------------------------------------------------------------- mistura de combustível */
.blend{display:grid;gap:10px}
.blend .pontas{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:end}
.blend .pontas .seta{padding-bottom:8px;color:var(--ink2);font-size:13px;font-weight:700}
.blend .barra-blend{position:relative;padding:4px 0 2px}
.blend input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:12px;border-radius:99px;
  background:var(--bg);border:1px solid var(--line);outline:none;padding:0;margin:0;cursor:pointer;
}
.blend input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;width:22px;height:22px;border-radius:50%;
  background:var(--card);border:3px solid var(--accent);cursor:grab;box-shadow:var(--shadow);
}
.blend input[type=range]::-moz-range-thumb{
  width:22px;height:22px;border-radius:50%;background:var(--card);
  border:3px solid var(--accent);cursor:grab;box-shadow:var(--shadow);
}
.blend input[type=range]:active::-webkit-slider-thumb{cursor:grabbing}
.blend .marcas{display:flex;justify-content:space-between;font-size:11px;color:var(--ink2);margin-top:4px}
.blend .proporcao{
  display:flex;justify-content:space-between;align-items:baseline;gap:10px;
  font-size:13px;font-weight:650;
}
.blend .proporcao b{font-size:17px;font-variant-numeric:tabular-nums;letter-spacing:-.3px}
.blend .atalhos{display:flex;flex-wrap:wrap;gap:6px}
.blend .atalhos button{padding:4px 10px;font-size:12px;font-weight:600}

/* ---------------------------------------------------------------- sobreposição de texto
   Plano B para quando o download é bloqueado (sandbox, navegador de celular). */
.sobreposicao{
  position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;
  background:rgba(8,11,16,.55);padding:16px;
}
.sobreposicao .painel{
  background:var(--card);border:1px solid var(--line);border-radius:var(--raio);
  box-shadow:0 12px 40px rgba(0,0,0,.3);padding:16px;width:min(720px,100%);
  max-height:min(86vh,720px);display:flex;flex-direction:column;gap:11px;
}
.sobreposicao h3{margin:0}
.sobreposicao textarea{
  flex:1;min-height:220px;resize:vertical;font-family:var(--mono);font-size:12px;
  line-height:1.5;white-space:pre;
}
.sobreposicao .acoes{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.sobreposicao .acoes .espaco{margin-left:auto}

/* ---------------------------------------------------------------- catálogo */
.catalogo{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
.calc{
  display:block;text-decoration:none;color:inherit;background:var(--card);
  border:1px solid var(--line);border-radius:var(--raio);padding:15px 16px;
  box-shadow:var(--shadow);transition:border-color .12s,transform .12s;
}
.calc:hover{border-color:var(--accent);transform:translateY(-1px)}
.calc .ico{font-size:22px;line-height:1;margin-bottom:9px;display:block}
.calc .nome{font-size:15px;font-weight:700;margin-bottom:4px;letter-spacing:-.2px}
.calc .desc{font-size:12.5px;color:var(--ink2);line-height:1.5}
.calc.breve{opacity:.62;pointer-events:none;border-style:dashed}
.calc.breve .nome::after{
  content:"em breve";float:right;font-size:10px;font-weight:700;text-transform:uppercase;
  letter-spacing:.04em;background:var(--bg);color:var(--ink2);padding:2px 7px;border-radius:99px;
}
.grupo{margin:26px 0 12px;font-size:13px;font-weight:700;color:var(--ink2);text-transform:uppercase;letter-spacing:.04em}
.grupo:first-of-type{margin-top:14px}

/* ---------------------------------------------------------------- documentação */
details.doc summary{cursor:pointer;font-weight:650;color:var(--ink2);font-size:13px}
details.doc{font-size:13px;line-height:1.65}
details.doc p{margin:10px 0}
code{
  font-family:var(--mono);background:var(--bg);padding:1px 5px;border-radius:5px;
  font-size:12.5px;border:1px solid var(--line);
}

/* ---------------------------------------------------------------- impressão */
@media print{
  body{background:#fff;padding:0}
  .topo,.barra,.presets,details.doc,.rodape{display:none}
  .card{box-shadow:none;break-inside:avoid;border-color:#ccc}
  .grafico svg{min-width:0}
}