.calculator-page {
  background: #f4f1e9;
}

.calculator-hero {
  padding: 142px 0 76px;
  background:
    radial-gradient(circle at 78% 20%, rgba(232, 79, 42, 0.2), transparent 28%),
    linear-gradient(135deg, #fff5eb, #edf0e7);
}

.calculator-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 72px;
  align-items: end;
}

.calculator-back {
  display: block;
  width: fit-content;
  margin-bottom: 44px;
  color: var(--muted);
  text-decoration: none;
}

.calculator-hero h1 {
  max-width: 780px;
  margin: 12px 0 0;
  font-size: clamp(3.4rem, 7vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.065em;
}

.calculator-hero h1 em {
  color: #e84f2a;
  font-style: normal;
}

.calculator-hero .lead {
  margin: 0;
}

.calculator-workspace {
  padding: 84px 0 110px;
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.75fr);
  gap: 24px;
  align-items: start;
}

.thermal-form {
  display: grid;
  gap: 16px;
}

.thermal-form fieldset {
  min-width: 0;
  padding: 28px;
  border: 1px solid rgba(36, 29, 24, 0.12);
  border-radius: 24px;
  background: rgba(255, 252, 247, 0.82);
}

.thermal-form legend {
  padding: 0 10px;
  font: 600 1.15rem/1.2 "Space Grotesk", sans-serif;
}

.thermal-form legend span {
  margin-right: 10px;
  color: #e84f2a;
  font-size: 0.76rem;
}

.fieldset-help,
.material-note,
.thermal-form small {
  color: var(--muted);
  line-height: 1.5;
}

.fieldset-help {
  margin: 0 0 22px;
}

.field-grid {
  display: grid;
  gap: 16px;
}

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

.field-grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.thermal-form label {
  display: grid;
  gap: 8px;
  color: #312822;
  font-size: 0.86rem;
  font-weight: 600;
}

.thermal-form input,
.thermal-form select {
  width: 100%;
  min-height: 48px;
  padding: 11px 13px;
  border: 1px solid rgba(36, 29, 24, 0.18);
  border-radius: 12px;
  color: #241d18;
  font: inherit;
  font-weight: 500;
  background: #fffdf9;
}

.thermal-form input:focus,
.thermal-form select:focus {
  border-color: #e84f2a;
  outline: 3px solid rgba(232, 79, 42, 0.13);
}

.range-grid {
  gap: 18px;
}

.thermal-form .range-field {
  gap: 16px;
  padding: 16px;
  border: 1px solid rgba(36, 29, 24, 0.12);
  border-radius: 16px;
  background: #fffdf9;
}

.range-field:focus-within {
  border-color: #e84f2a;
  box-shadow: 0 0 0 3px rgba(232, 79, 42, 0.13);
}

.range-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.range-heading output {
  color: #e84f2a;
  font: 600 1.15rem/1 "Space Grotesk", sans-serif;
  white-space: nowrap;
}

.thermal-form .mode-range {
  appearance: none;
  min-height: 32px;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  cursor: pointer;
}

.thermal-form .mode-range::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(49, 40, 34, 0.28) 1px, transparent 1px) 0 50% / calc(100% / var(--range-steps)) 100%,
    #e8ded3;
}

.thermal-form .mode-range::-webkit-slider-thumb {
  appearance: none;
  width: 30px;
  height: 30px;
  margin-top: -11px;
  border: 5px solid #fffdf9;
  border-radius: 50%;
  background: #e84f2a;
  box-shadow: 0 3px 12px rgba(108, 42, 24, 0.35);
}

.thermal-form .mode-range::-moz-range-track {
  height: 8px;
  border: 0;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(49, 40, 34, 0.28) 1px, transparent 1px) 0 50% / calc(100% / var(--range-steps)) 100%,
    #e8ded3;
}

.thermal-form .mode-range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 5px solid #fffdf9;
  border-radius: 50%;
  background: #e84f2a;
  box-shadow: 0 3px 12px rgba(108, 42, 24, 0.35);
}

.insulation-layer + .insulation-layer {
  padding-top: 24px;
  margin-top: 24px;
  border-top: 1px solid rgba(36, 29, 24, 0.1);
}

.insulation-layer > strong {
  display: block;
  margin-bottom: 14px;
}

.material-note {
  margin: 12px 0 0;
  font-size: 0.8rem;
}

.insulation-surface-control {
  margin-bottom: 24px;
}

.material-compatibility-note {
  margin: -10px 0 24px;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.choice-picker {
  display: grid;
  grid-column: 1 / -1;
  gap: 8px;
}

.choice-picker-label {
  color: #312822;
  font-size: 0.86rem;
  font-weight: 600;
}

.choice-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.choice-chip {
  min-height: 40px;
  padding: 9px 13px;
  border: 1px solid rgba(36, 29, 24, 0.16);
  border-radius: 999px;
  color: #312822;
  font: 600 0.78rem/1.15 "IBM Plex Sans", sans-serif;
  background: #fffdf9;
  cursor: pointer;
}

.choice-chip:hover:not(:disabled),
.choice-chip:focus-visible {
  border-color: #e84f2a;
  outline: 3px solid rgba(232, 79, 42, 0.13);
}

.choice-chip.is-selected {
  border-color: #e84f2a;
  color: #fff;
  background: #e84f2a;
}

.choice-chip.is-unavailable {
  color: #8b817a;
  background: #eee9e3;
  cursor: not-allowed;
  text-decoration: line-through;
}

.choice-chip.is-unavailable::after {
  content: "Недоступно";
  margin-left: 7px;
  color: #a33f26;
  font-size: 0.65rem;
  text-decoration: none;
}

.thermal-form .auto-thickness {
  color: #e84f2a;
  font-size: 1.05rem;
  background: #fff6ed;
}

.auto-thickness-note {
  color: #9b3a22;
  font-weight: 600;
}

.layer-temperature {
  width: fit-content;
  padding: 7px 11px;
  margin: 12px 0 0;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
}

.layer-temperature-hot {
  color: #7b2414;
  background: linear-gradient(90deg, #ff9b70, #ffd8bf);
}

.layer-temperature-cool {
  color: #35554d;
  background: linear-gradient(90deg, #ffd8bf, #dce9df);
}

.calculator-submit {
  width: 100%;
  min-height: 58px;
  margin-top: 24px;
  font-size: 1rem;
}

.calculator-result {
  position: sticky;
  top: 104px;
  min-height: 0;
  padding: 30px;
  border-radius: 26px;
  color: #fffaf4;
  background: #211b17;
  box-shadow: 0 28px 70px rgba(36, 29, 24, 0.18);
}

.calculator-result-empty {
  display: grid;
  gap: 20px;
}

.calculator-result-empty span,
.result-kicker {
  color: #f06440;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.calculator-result-empty strong {
  font: 600 2rem/1.05 "Space Grotesk", sans-serif;
}

.calculator-result-empty .result-preview-power {
  font-size: clamp(2.5rem, 4vw, 4rem);
  letter-spacing: -0.05em;
}

.calculator-result-empty p,
.result-current {
  color: rgba(255, 250, 244, 0.62);
  line-height: 1.6;
}

.result-power {
  display: block;
  margin: 12px 0 4px;
  font: 600 clamp(3.2rem, 6vw, 5.3rem)/1 "Space Grotesk", sans-serif;
  letter-spacing: -0.05em;
}

.result-list {
  margin: 28px 0;
}

.result-list div {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 0;
  border-top: 1px solid rgba(255, 250, 244, 0.13);
}

.result-list dt {
  color: rgba(255, 250, 244, 0.55);
}

.result-list dd {
  margin: 0;
  font-weight: 600;
  text-align: right;
}

.result-warning {
  padding: 16px;
  margin-bottom: 22px;
  border-radius: 14px;
  color: #4d2417;
  background: #ffd4bf;
}

.result-warning p {
  margin: 0;
  line-height: 1.45;
}

.result-warning p + p {
  margin-top: 8px;
}

.calculator-error {
  margin: 18px 0 0;
  color: #ff9b7c;
}

.calculator-method {
  padding: 92px 0;
  color: #fffaf4;
  background: #211b17;
}

.calculator-method-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
}

.calculator-method h2 {
  margin: 12px 0 0;
}

.calculator-method p {
  color: rgba(255, 250, 244, 0.66);
  line-height: 1.75;
}

@media (max-width: 980px) {
  .calculator-hero-grid,
  .calculator-layout,
  .calculator-method-grid {
    grid-template-columns: 1fr;
  }

  .calculator-hero-grid,
  .calculator-method-grid {
    gap: 36px;
  }

  .calculator-result {
    position: static;
  }
}

@media (max-width: 700px) {
  .calculator-hero {
    padding: 118px 0 60px;
  }

  .calculator-workspace,
  .calculator-method {
    padding: 60px 0;
  }

  .field-grid-3,
  .field-grid-2 {
    grid-template-columns: 1fr;
  }

  .thermal-form fieldset,
  .calculator-result {
    padding: 22px;
  }
}