.sim-page {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 48px;
}

.sim-hero {
  max-width: 820px;
  margin-bottom: 22px;
}

.sim-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid rgba(31, 78, 121, .18);
  border-radius: 6px;
  color: #1f4e79;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.sim-hero h1 {
  margin: 12px 0 10px;
  max-width: 760px;
  color: #172033;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.02;
  letter-spacing: 0;
}

.sim-hero p {
  margin: 0;
  color: #5c6575;
  font-size: 17px;
  line-height: 1.6;
}

.sim-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
  gap: 18px;
  align-items: start;
}

.sim-panel,
.sim-result {
  border: 1px solid #dce5ef;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 26px rgba(31, 78, 121, .08);
}

.sim-panel {
  padding: 20px;
}

.sim-panel-head {
  margin-bottom: 16px;
}

.sim-panel-head h2 {
  margin: 0 0 4px;
  color: #1f2937;
  font-size: 20px;
}

.sim-panel-head p {
  margin: 0;
  color: #667085;
  font-size: 14px;
}

.sim-controls {
  display: grid;
  gap: 14px;
}

.sim-control-pair,
.sim-dimensions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.sim-dimensions {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sim-control-block,
.sim-range-field {
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #fbfcfe;
  padding: 12px;
}

.sim-control-title {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.sim-control-title.compact {
  margin-bottom: 8px;
}

.sim-control-title span,
.sim-field span,
.sim-check span {
  color: #344054;
  font-size: 13px;
  font-weight: 800;
}

.sim-control-title strong {
  color: #667085;
  font-size: 12px;
  font-weight: 700;
  text-align: right;
}

.sim-choice-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.sim-choice-row.compact {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sim-choice-row.compact[data-choice-for="simRoof"] {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sim-choice-btn {
  min-height: 42px;
  border: 1px solid #cdd7e3;
  border-radius: 7px;
  background: #fff;
  color: #233044;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  padding: 8px 10px;
  transition: border-color .16s ease, background .16s ease, color .16s ease, box-shadow .16s ease;
}

.sim-choice-btn:hover {
  border-color: #2e75b6;
  box-shadow: 0 4px 12px rgba(46, 117, 182, .12);
}

.sim-choice-btn.is-active {
  border-color: #1f4e79;
  background: #1f4e79;
  color: #fff;
  box-shadow: 0 6px 16px rgba(31, 78, 121, .18);
}

.sim-choice-btn:disabled {
  border-color: #e5e7eb;
  background: #f3f4f6;
  color: #98a2b3;
  cursor: not-allowed;
  box-shadow: none;
}

.sim-choice-btn.is-active:disabled {
  border-color: #1f4e79;
  background: #dbeafe;
  color: #1f4e79;
}

.sim-field {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.sim-number-line {
  display: grid;
  grid-template-columns: minmax(62px, auto) minmax(84px, 1fr);
  gap: 9px;
  align-items: center;
}

.sim-number-line strong {
  color: #1f4e79;
  font-size: 18px;
  line-height: 1;
  white-space: nowrap;
}

.sim-field input[type="number"] {
  width: 100%;
  min-height: 38px;
  border: 1px solid #cdd7e3;
  border-radius: 7px;
  background: #fff;
  color: #172033;
  font: inherit;
  padding: 7px 9px;
}

.sim-field input[type="range"] {
  width: 100%;
  accent-color: #1f4e79;
}

.sim-field input:focus {
  outline: 2px solid rgba(46, 117, 182, .18);
  border-color: #2e75b6;
}

.sim-toggles {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.sim-check {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 11px;
  border: 1px solid #e4e9f0;
  border-radius: 7px;
  background: #f8fafc;
}

.sim-check input {
  width: 18px;
  height: 18px;
  margin-top: 1px;
}

.sim-result {
  position: sticky;
  top: 88px;
  padding: 20px;
}

.sim-result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: #667085;
  font-size: 13px;
  font-weight: 700;
}

.sim-result-head strong {
  color: #1f4e79;
}

.sim-total {
  margin-top: 12px;
  color: #172033;
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 800;
  line-height: 1;
}

.sim-subtotal {
  margin-top: 7px;
  color: #667085;
  font-size: 15px;
}

.sim-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.sim-metrics div,
.sim-breakdown-row {
  border: 1px solid #e5eaf1;
  border-radius: 7px;
  background: #f8fafc;
}

.sim-metrics div {
  padding: 11px;
}

.sim-metrics span,
.sim-breakdown-row span {
  display: block;
  color: #697386;
  font-size: 12px;
}

.sim-metrics strong,
.sim-breakdown-row strong {
  display: block;
  margin-top: 3px;
  color: #1f2937;
  font-size: 15px;
}

.sim-breakdown {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.sim-breakdown-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 11px;
}

.sim-breakdown-row strong {
  margin: 0;
  white-space: nowrap;
}

.sim-warnings {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.sim-warning {
  border-left: 3px solid #c47f00;
  border-radius: 6px;
  background: #fff8e8;
  color: #6b4b0a;
  font-size: 13px;
  line-height: 1.45;
  padding: 9px 11px;
}

.sim-error {
  border-left-color: #c62828;
  background: #fff1f1;
  color: #7f1d1d;
}

.sim-actions {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.sim-link {
  display: inline-flex;
  justify-content: center;
  color: #1f4e79;
  font-weight: 700;
  text-decoration: none;
}

.sim-link:hover {
  text-decoration: underline;
}

@media (max-width: 840px) {
  .sim-page {
    width: min(100% - 22px, 680px);
    padding-top: 24px;
  }

  .sim-shell {
    grid-template-columns: 1fr;
  }

  .sim-result {
    position: static;
  }
}

@media (max-width: 560px) {
  .sim-control-pair,
  .sim-dimensions,
  .sim-metrics {
    grid-template-columns: 1fr;
  }

  .sim-control-title {
    display: grid;
    gap: 3px;
  }

  .sim-control-title strong {
    text-align: left;
  }

  .sim-choice-row,
  .sim-choice-row.compact,
  .sim-choice-row.compact[data-choice-for="simRoof"] {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sim-panel,
  .sim-result {
    padding: 16px;
  }
}