:root {
  --sun: #f5a623;
  --sun-dim: #c47d10;
  --bg-calc: #ffffff;
  --bg2-calc: #f1f5f9;
  --bg3-calc: #f8fafc;
  --border-calc: #e2e8f0;
  --border-bright-calc: #cbd5e1;
  --text-calc: #0f172a;
  --text-dim-calc: #64748b;
  --red: #ef4444;
  --blue: #3b82f6;
}

.calc-page { padding: 32px 0 64px; }
.calc-page h1 { text-align: center; font-size: 32px; font-weight: 900; margin-bottom: 8px; }
.calc-page .lead { text-align: center; color: var(--muted); margin-bottom: 32px; }

.calc-wrap { display: flex; flex-direction: column; gap: 16px; max-width: 900px; margin: 0 auto; }

.calc-wrap .card {
  background: var(--bg-calc);
  border: 1px solid var(--border-calc);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.card-title { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.card-title h2 { font-size: 1.1rem; font-weight: 800; }
.card-title .icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--bg2-calc); display: grid; place-items: center;
}
.badge {
  margin-right: auto;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(245, 166, 35, 0.15);
  color: var(--sun-dim);
  font-weight: 800;
}

.params-grid, .settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.params-grid .full, .settings-grid .full { grid-column: 1 / -1; }
.param-item label, .setting-group label {
  display: block; font-size: 0.8rem; font-weight: 800; color: var(--text-dim-calc);
  margin-bottom: 6px;
}
.param-item input, select.styled {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-bright-calc);
  font-family: inherit;
  font-weight: 700;
}
.param-unit { font-size: 12px; color: var(--text-dim-calc); margin-top: 4px; }

.btn-group { display: flex; flex-wrap: wrap; gap: 8px; }
.btn-opt {
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--border-bright-calc);
  background: var(--bg3-calc);
  font-family: inherit;
  font-weight: 800;
  cursor: pointer;
}
.btn-opt.active { background: var(--text-calc); color: #fff; border-color: var(--text-calc); }

#loads-list { display: flex; flex-direction: column; gap: 12px; }
.device-card {
  background: var(--bg3-calc);
  border: 1px solid var(--border-calc);
  border-radius: 12px;
  padding: 16px;
}
.dc-header { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.dc-num {
  width: 24px; height: 24px; background: var(--text-calc);
  border-radius: 50%; display: grid; place-items: center;
  font-size: 12px; font-weight: 900; color: #fff;
}
input.dc-name {
  flex: 1; padding: 8px 12px; border-radius: 8px;
  border: 1px solid var(--border-bright-calc); font-family: inherit; font-weight: 700;
}
.btn-del {
  width: 32px; height: 32px; border: none; border-radius: 8px;
  background: rgba(239, 68, 68, 0.1); color: var(--red); cursor: pointer; font-weight: 800;
}
.dc-inputs { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.dc-hours { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dc-field label { display: block; font-size: 11px; font-weight: 800; color: var(--text-dim-calc); margin-bottom: 4px; }
.dc-field input {
  width: 100%; padding: 8px; border-radius: 6px;
  border: 1px solid var(--border-bright-calc); text-align: center; font-weight: 700;
}
.dc-energy {
  margin-top: 10px; display: flex; justify-content: space-between;
  padding: 8px 12px; background: var(--bg-calc); border-radius: 8px;
  border: 1px solid var(--border-calc); font-weight: 700;
}
.total-strip {
  display: none; margin-top: 12px; padding: 12px 16px;
  background: rgba(245, 166, 35, 0.1);
  border: 1px solid rgba(245, 166, 35, 0.3);
  border-radius: 10px;
  justify-content: space-between; align-items: center;
}
.btn-add {
  width: 100%; margin-top: 12px; padding: 14px;
  border: 2px dashed var(--border-bright-calc);
  border-radius: 10px; background: none;
  font-family: inherit; font-weight: 800; cursor: pointer;
}
.btn-calculate {
  width: 100%; padding: 18px; border: none; border-radius: 12px;
  background: var(--text-calc); color: #fff;
  font-family: inherit; font-size: 18px; font-weight: 900; cursor: pointer;
}
.calc-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
#results-section { display: none; }
.summary-bar { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.summary-item { background: var(--bg3-calc); border: 1px solid var(--border-calc); border-radius: 10px; padding: 12px; }
.results-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.result-card {
  border: 2px solid var(--border-calc);
  border-radius: 12px; padding: 16px; text-align: center;
}
.result-card .rc-value { font-size: 1.6rem; font-weight: 900; }
.quotation-preview {
  margin-top: 20px; padding: 16px;
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 12px;
}
.quotation-preview table { width: 100%; font-size: 13px; margin-top: 10px; }
.quotation-preview th, .quotation-preview td { padding: 8px; border-bottom: 1px solid #fde68a; text-align: right; }

.settings-note {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
  line-height: 1.7;
}

.voltage-tiers {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
}

.v-tier {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-calc);
  background: var(--bg3-calc);
  font-size: 13px;
}

.v-tier strong { display: block; margin-bottom: 4px; }
.v-tier span { color: var(--text-dim-calc); font-size: 12px; }
.v-tier p { margin-top: 6px; color: var(--text-dim-calc); font-size: 12px; }

.v-tier.suggested {
  border-color: var(--sun);
  background: rgba(245, 166, 35, 0.12);
  box-shadow: 0 0 0 2px rgba(245, 166, 35, 0.2);
}

.v-tier.active {
  border-color: #0f172a;
  background: #f1f5f9;
}

.voltage-advice-box {
  padding: 14px;
  border-radius: 12px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  font-size: 14px;
  line-height: 1.7;
}

.advice-disclaimer {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: #92400e;
}

.btn-sm { padding: 8px 14px; font-size: 13px; margin-top: 10px; }

.preset-row { margin-bottom: 16px; }
.preset-row label { font-weight: 800; font-size: 14px; display: block; margin-bottom: 8px; }
.preset-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.preset-actions select { flex: 1; min-width: 200px; }

.dc-header .dc-select { flex: 1; min-width: 0; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border-bright-calc); font-family: inherit; font-weight: 700; }

.voltage-result-note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  font-size: 14px;
  line-height: 1.7;
}

@media (max-width: 640px) {
  .dc-inputs, .params-grid, .settings-grid, .results-grid, .summary-bar { grid-template-columns: 1fr; }
  .preset-actions { flex-direction: column; align-items: stretch; }
}