/* concentration calculator layout */
.concentration-form .mode-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.concentration-form .mode-row select,
.concentration-form .mode-row input {
  max-width: 220px;
}

.concentration-fieldset {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: 12px;
}

.concentration-fieldset label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-weight: 600;
}

.concentration-fieldset label span {
  font-weight: 600;
}

.concentration-fieldset label select,
.concentration-fieldset label input {
  font-weight: 400;
}

.concentration-subgroup {
  border: 1px solid var(--border-color, #d7dbe0);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
  background: var(--surface-subtle, rgba(0, 0, 0, 0.02));
}

.concentration-subgroup legend {
  font-weight: 600;
  margin-bottom: 8px;
}

.concentration-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.concentration-output {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.result-primary .result-title {
  font-weight: 700;
  margin-bottom: 8px;
}

.result-primary .result-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
}

.result-primary .result-unit {
  font-size: 1rem;
  font-weight: 600;
}

.result-details,
.result-notes {
  padding-left: 16px;
  margin: 8px 0 0;
}

.result-details li,
.result-notes li {
  margin-bottom: 6px;
}

.result-details .detail-label {
  font-weight: 600;
  margin-right: 6px;
}

.molarity-mass-fields,
.molarity-moles-fields,
.percentww-percent,
.percentww-mass,
.percentwv-percent,
.percentwv-mass {
  display: none;
}

form.molarity-method-mass .molarity-mass-fields {
  display: grid;
}

form.molarity-method-moles .molarity-moles-fields {
  display: grid;
}

form[data-percentww-mode="percent"] .percentww-percent,
form[data-percentww-mode="mass"] .percentww-mass {
  display: grid;
}

form[data-percentwv-mode="percent"] .percentwv-percent,
form[data-percentwv-mode="mass"] .percentwv-mass {
  display: grid;
}

.steps-list {
  list-style: decimal;
  padding-left: 20px;
  margin: 0;
  line-height: 1.5;
}

.teacher-notes {
  margin-top: 12px;
}

.teacher-notes li {
  margin-bottom: 6px;
}

@media (max-width: 768px) {
  .concentration-form .mode-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .concentration-actions {
    flex-direction: column;
    align-items: stretch;
  }
}