#bgCalcShell {
  max-width: 700px;
  margin: 24px auto 0;
  text-align: left;
}

#bgCalcShell .bg-calc-toggle {
  list-style: none;
  cursor: pointer;
  border: 1px solid var(--c-blue, #0071e3);
  border-radius: 980px;
  padding: 12px 18px;
  font-size: 17px;
  color: #fff;
  background: var(--c-blue, #0071e3);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  margin-bottom: 16px;
  text-align: center;
}

#bgCalcShell .bg-calc-toggle:hover {
  border-color: var(--c-blue-hover, #0077ed);
  background: var(--c-blue-hover, #0077ed);
}

#bgCalcShell[open] .bg-calc-toggle {
  background: #0a66cc;
  border-color: #0a66cc;
}

#bgCalcShell .bg-calc-toggle::-webkit-details-marker {
  display: none;
}

#bgCalcShell .bg-calc-toggle::after {
  content: " +";
  font-weight: 600;
}

#bgCalcShell[open] .bg-calc-toggle::after {
  content: " -";
}

#bgCalc {
  --c-blue: #0071e3;
  --c-blue-hover: #0077ed;
  --c-text: #1d1d1f;
  --c-text-2: #6e6e73;
  --c-card: #fbfbfd;
  --c-card-hover: #f5f5f7;
  --c-line: rgba(0, 0, 0, 0.1);
  --c-healthy: #0071e3;
  --c-concerning: #b25000;
  --c-critical: #c5391f;
  --c-emergency: #a4140a;

  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", sans-serif;
  color: var(--c-text);
  max-width: 700px;
  margin: 0 auto;
  letter-spacing: -0.011em;
}

#bgCalc * {
  box-sizing: border-box;
}

#bgCalc .head {
  text-align: center;
  margin-bottom: 32px;
}

#bgCalc .eyebrow {
  font-size: 15px;
  font-weight: 500;
  color: var(--c-blue);
  margin: 0 0 10px;
}

#bgCalc h2 {
  font-size: 30px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

#bgCalc .sub {
  font-size: 19px;
  line-height: 1.47;
  color: var(--c-text-2);
  max-width: 52ch;
  margin: 0 auto;
}

#bgCalc .card {
  background: var(--c-card);
  border-radius: 18px;
  padding: 30px 30px;
  margin-bottom: 20px;
}

#bgCalc .field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 20px;
}

#bgCalc .field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

#bgCalc .field.full {
  grid-column: 1 / -1;
}

#bgCalc label {
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.4;
}

#bgCalc input[type="number"] {
  font-family: inherit;
  font-size: 17px;
  color: var(--c-text);
  border: 1px solid var(--c-line);
  border-radius: 12px;
  padding: 10px 13px;
  background: #fff;
  width: 100%;
}

#bgCalc input[type="number"]:focus {
  outline: none;
  border-color: var(--c-blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

#bgCalc .slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

#bgCalc input[type="range"] {
  flex: 1;
  accent-color: var(--c-blue);
}

#bgCalc .slider-val {
  font-size: 17px;
  font-weight: 600;
  min-width: 44px;
  text-align: right;
}

#bgCalc .pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#bgCalc .pill {
  font-family: inherit;
  font-size: 15px;
  color: var(--c-text);
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 980px;
  padding: 8px 15px;
  cursor: pointer;
}

#bgCalc .pill:hover {
  border-color: rgba(0, 0, 0, 0.25);
}

#bgCalc .pill.active {
  background: var(--c-text);
  color: #fff;
  border-color: var(--c-text);
}

#bgCalc .pill:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 2px;
}

#bgCalc .result-card {
  text-align: left;
  background: #f5f5f7;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

#bgCalc .result-top {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

#bgCalc .result-num {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

#bgCalc .result-unit {
  font-size: 17px;
  color: var(--c-text-2);
}

#bgCalc .result-label {
  font-size: 16px;
  color: var(--c-text-2);
  margin: 0 0 22px;
}

#bgCalc .breakdown {
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.9;
  margin: 0 0 22px;
  font-variant-numeric: tabular-nums;
}

#bgCalc .breakdown strong {
  color: var(--c-text);
  font-weight: 500;
}

#bgCalc .verdict {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 500;
  margin: 0 0 20px;
}

#bgCalc .flags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

#bgCalc .flag-chip {
  font-size: 14px;
  color: var(--c-text-2);
  border: 1px solid var(--c-line);
  padding: 5px 12px;
  border-radius: 980px;
}

#bgCalc .cta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

#bgCalc .cta-button {
  display: inline-block;
  background: var(--c-blue);
  color: #fff;
  padding: 12px 22px;
  border-radius: 980px;
  text-decoration: none;
  font-size: 17px;
  font-weight: 400;
}

#bgCalc .cta-button:hover {
  background: var(--c-blue-hover);
}

#bgCalc .cta-button:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
}

#bgCalc .reset-link {
  font-size: 15px;
  color: var(--c-blue);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

#bgCalc .reset-link:hover {
  opacity: 0.7;
}

#bgCalc .assumption-note {
  font-size: 14px;
  color: var(--c-text-2);
  margin-top: 18px;
}

@media (max-width: 560px) {
  #bgCalc .field-grid {
    grid-template-columns: 1fr;
  }

  #bgCalc h2 {
    font-size: 24px;
  }

  #bgCalc .card {
    padding: 24px 20px;
  }

  #bgCalc .result-num {
    font-size: 32px;
  }
}