/* ==========================================================================
   Equações — abas, campos de coeficientes, resultado, gráfico e passo a passo.
   Cores das séries validadas para leitura com daltonismo nos dois temas.
   ========================================================================== */

.eq {
  --eq-serie-1: #3b82f6;
  --eq-serie-2: #d9730f;
  --eq-erro: #ffb4a8;
}
:root[data-theme="light"] .eq {
  --eq-serie-1: #2563eb;
  --eq-serie-2: #c2410c;
  --eq-erro: #b42318;
}

.eq-abas {
  margin-bottom: 20px;
}
.eq-painel {
  display: grid;
  gap: 14px;
}
.eq-painel[hidden] {
  display: none;
}
.eq-modelo {
  margin: 0;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 650;
  text-align: center;
  color: var(--text);
}
.eq-coeficientes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(64px, 1fr));
  gap: 10px;
}
.eq-coeficientes .field > label,
.eq-linha .field > label {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 15px;
}
.eq .input {
  min-width: 0;
  padding-inline: 10px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.eq-erro {
  font-size: 12px;
  font-weight: 650;
  color: var(--eq-erro);
}
.eq-erro[hidden] {
  display: none;
}

/* Sistema: uma linha por equação */
.eq-linha {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}
.eq-linha[hidden] {
  display: none;
}
.eq-linha legend {
  margin-bottom: 6px;
  padding: 0;
  font-size: 14px;
  font-weight: 650;
  color: var(--text-2);
}
.eq-linha-campos {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.eq-painel[data-tamanho="2"] .eq-linha-campos {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.eq-linha .field[data-coluna="3"] {
  padding-left: 8px;
  border-left: 1px dashed var(--border-2);
}

.eq-acoes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Resultado ---------- */
.eq-equacao {
  margin: 4px 0 12px;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 17px;
  font-weight: 650;
  color: var(--text);
  overflow-wrap: anywhere;
}
.eq-aviso {
  margin: 0 0 12px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text-2);
  background: var(--surface-3);
  border-left: 4px solid var(--accent);
  border-radius: var(--r-sm);
}
.eq-natureza {
  margin: 0 0 10px;
  font-weight: 650;
  color: var(--text);
}
.eq .result-value {
  margin-bottom: 10px;
}
.eq-raizes {
  margin-bottom: 14px;
}
.eq-raizes div {
  font-size: 16px;
}
.eq-raizes dt {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  color: var(--text-2);
}
.eq-raizes dd {
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.eq-detalhes dd {
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

/* ---------- Gráfico ---------- */
.eq-grafico {
  margin: 26px 0 0;
}
.eq-grafico[hidden],
.eq-passos-bloco[hidden] {
  display: none;
}
.eq-grafico-topo {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: 10px;
}
.eq-grafico-titulo {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}
.eq-legenda {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 13.5px;
  color: var(--text-2);
}
.eq-legenda-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eq-amostra {
  width: 18px;
  height: 3px;
  border-radius: 2px;
  background: var(--eq-serie-1);
}
.eq-amostra.eq-serie-2 {
  background: var(--eq-serie-2);
}
.eq-grafico-area {
  min-width: 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
}
.eq-svg {
  display: block;
  width: 100%;
  height: auto;
  touch-action: pan-y;
  cursor: crosshair;
}
.eq-svg:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: -3px;
}
.eq-grade line {
  stroke: var(--border);
  stroke-width: 1;
}
.eq-eixos line {
  stroke: var(--muted);
  stroke-width: 1.5;
}
.eq-marcas text {
  font-size: 11px;
  fill: var(--muted);
  font-variant-numeric: tabular-nums;
}
.eq-curva {
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.eq-curva.eq-serie-1 {
  stroke: var(--eq-serie-1);
}
.eq-curva.eq-serie-2 {
  stroke: var(--eq-serie-2);
}
.eq-ponto {
  fill: var(--text);
  stroke: var(--surface);
  stroke-width: 2;
}
.eq-ponto-rotulo {
  font-size: 12px;
  font-weight: 700;
  fill: var(--text);
  paint-order: stroke;
  stroke: var(--surface);
  stroke-width: 3px;
  stroke-linejoin: round;
}
.eq-cursor line {
  stroke: var(--text-2);
  stroke-width: 1;
  stroke-dasharray: 4 3;
}
.eq-cursor circle {
  stroke: var(--surface);
  stroke-width: 2;
}
.eq-cursor circle.eq-serie-1 {
  fill: var(--eq-serie-1);
}
.eq-cursor circle.eq-serie-2 {
  fill: var(--eq-serie-2);
}
#eq-leitura {
  min-height: 1.5em;
  margin: 8px 0 0;
  font-variant-numeric: tabular-nums;
}

/* ---------- Passo a passo ---------- */
.eq-passos {
  margin: 0;
  padding-left: 22px;
  color: var(--text-2);
}
.eq-passos li {
  margin-bottom: 8px;
  overflow-wrap: anywhere;
}
.eq-passos li::marker {
  color: var(--muted);
  font-weight: 700;
}

@media (max-width: 400px) {
  .eq-linha-campos {
    gap: 6px;
  }
  .eq .input {
    padding-inline: 6px;
  }
  .eq-linha .field[data-coluna="3"] {
    padding-left: 6px;
  }
}