.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.35fr);
  align-items: start;
  gap: 24px;
}

.tool-panel {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
}
.tool-panel .eyebrow {
  margin-bottom: 4px;
}
.tool-panel h2 {
  margin: 0 0 24px;
  font-size: 23px;
}
.field-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
}
.tool-input {
  width: 100%;
  min-width: 0;
  height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 15px;
}
.tool-input:focus-visible,
.tool-button:focus-visible,
.calculation-notes summary:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}
.tool-input::placeholder {
  color: var(--muted);
}
.tool-button {
  min-height: 44px;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
}
.lookup-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  margin-top: 10px;
}
.gas-details {
  margin: 24px 0;
  border-top: 1px solid var(--border);
}
.gas-details > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.gas-details dt {
  color: var(--muted);
  font-size: 14px;
}
.gas-details dt span {
  display: block;
  margin-top: 2px;
  font-size: 12px;
}
.gas-details dd {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}
.tool-hint {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}
.gas-count-field {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
}
.gas-count-field input {
  width: 76px;
}
.gas-count-field .tool-hint {
  margin: 0;
}
.mixture-column-head,
.mixture-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) minmax(0, 0.65fr) 16px;
  align-items: center;
  gap: 12px;
}
.mixture-column-head {
  margin: 24px 0 10px;
  color: var(--muted);
  font-size: 12px;
}
.mixture-row {
  margin-top: 12px;
  font-size: 13px;
}
.mixture-row[hidden] {
  display: none;
}
.calculation-actions {
  margin-top: 24px;
}
.form-error {
  margin: 18px 0 0;
  color: light-dark(#b42318, #ffb4ab);
  font-size: 13px;
}
.tool-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--tint);
}
.tool-results label {
  display: block;
  color: var(--muted);
  font-size: 12px;
}
.tool-results output {
  display: block;
  margin-top: 8px;
  color: var(--blue);
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.4;
  overflow-wrap: anywhere;
}
.result-status:empty {
  display: none;
}
.calculation-notes {
  margin-top: 24px;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
}
.calculation-notes summary {
  color: var(--ink);
  cursor: pointer;
  font-weight: 700;
}
.calculation-notes p:last-child {
  margin-bottom: 0;
}
.ratio-dialog {
  width: min(440px, calc(100% - 32px));
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--ink);
  background: var(--surface);
  box-shadow: 0 20px 60px #18243c33;
}
.ratio-dialog::backdrop {
  background: #18243c66;
}
.ratio-dialog h2 {
  margin: 0 0 12px;
  font-size: 21px;
}
.ratio-dialog p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}
.secondary-button {
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--tint);
  color: var(--ink);
  font-size: 14px;
}
.secondary-button:hover {
  background: var(--page);
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 1180px) {
  .calculator-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .tool-panel {
    padding: 20px;
  }
  .mixture-column-head,
  .mixture-row {
    grid-template-columns: 48px minmax(0, 1fr) minmax(0, 0.65fr) 12px;
    gap: 8px;
  }
}

@media (max-width: 760px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .tool-panel {
    padding: 20px 16px;
  }
  .tool-input {
    font-size: 16px;
    padding-inline: 6px;
  }
  .mixture-column-head,
  .mixture-row {
    grid-template-columns: 44px minmax(0, 1fr) 76px 12px;
    gap: 6px;
  }
  .tool-results {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}