/* Изолированные стили: можно подключить отдельным файлом или добавить в style.css. */
.boiler-calc { margin: 0 0 100px; font-family: inherit; color: #172b49; }
.boiler-calc *, .boiler-calc *::before, .boiler-calc *::after { box-sizing: border-box; }
.boiler-calc [hidden] { display: none !important; }
.boiler-calc__title { margin: 0 0 20px; }
.boiler-calc__intro { max-width: 850px; margin: 0 0 28px; color: #5e708b; }
.boiler-calc__layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 36px; align-items: start; }
.boiler-calc__form { min-width: 0; }
.boiler-calc__field { margin-bottom: 24px; }
.boiler-calc__field > label { display: block; margin-bottom: 10px; font-size: 17px; font-weight: 600; }
.boiler-calc select, .boiler-calc input[type="number"] { width: 100%; min-height: 48px; padding: 12px; border: 1px solid #c4cede; border-radius: 12px; background: #fff; color: #172b49; font: inherit; }
.boiler-calc select { white-space: nowrap; text-overflow: ellipsis; }
.boiler-calc small { display: block; margin-top: 6px; color: #5e708b; font-size: 13px; line-height: 1.45; }
.boiler-calc__subtitle { margin: 28px 0 10px; font-size: 20px; }
.boiler-calc__hint { margin: 0 0 18px; font-size: 14px; color: #5e708b; }
.boiler-calc__group { margin-bottom: 12px; border: 1px solid #dde4ee; border-radius: 16px; overflow: hidden; }
.boiler-calc__group > summary { padding: 17px; cursor: pointer; font-size: 15px; font-weight: 600; background: #f4f7fc; }
.boiler-calc__option { display: grid; grid-template-columns: minmax(0, 1fr) 86px; align-items: center; gap: 12px; margin: 0 16px; padding: 14px 0; border-top: 1px solid #e7edf5; }
.boiler-calc__check { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; font-size: 14px; line-height: 1.45; min-width: 0; }
.boiler-calc__check input { flex: 0 0 auto; width: 18px; height: 18px; margin: 2px 0 0; accent-color: #2563eb; }
.boiler-calc__quantity input { padding: 10px 8px; }
.boiler-calc input:disabled { background: #f4f7fc; color: #8a96aa; }
.boiler-calc input[aria-invalid="true"] { border-color: #b91c1c; background: #fff6f6; }
.boiler-calc :is(input, select, summary, button, a):focus-visible { outline: 3px solid #93b6ff; outline-offset: 3px; }
.boiler-calc__result { position: sticky; top: 24px; padding: 26px; border: 1px solid #dde4ee; border-radius: 22px; background: #f4f7fc; min-width: 0; }
.boiler-calc__result h3 { margin: 0 0 16px; font-size: 22px; }
.boiler-calc__row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; padding: 12px 0; border-bottom: 1px solid #dde4ee; font-size: 14px; }
.boiler-calc__row span { overflow-wrap: anywhere; }
.boiler-calc__row strong { white-space: nowrap; text-align: right; }
.boiler-calc__total { padding: 22px 0 8px; }
.boiler-calc__total > span { display: block; margin-bottom: 8px; font-weight: 600; }
.boiler-calc__total > strong { display: block; color: #2563eb; font-size: 26px; overflow-wrap: anywhere; }
.boiler-calc__status { margin: 12px 0; font-size: 13px; line-height: 1.5; }
.boiler-calc__notice { margin: 0 0 18px; padding: 14px; border-radius: 12px; background: #fff; color: #5e708b; font-size: 13px; line-height: 1.5; }
.boiler-calc__button { display: block; padding: 15px 20px; border-radius: 48px; background: #2563eb; color: #fff; text-align: center; text-decoration: none; font-size: 16px; }
.boiler-calc__button:hover { background: #2c41cc; color: #fff; text-decoration: none; }
.boiler-calc__button[aria-disabled="true"] { background: #c8d2e2; color: #394b67; cursor: default; }
.boiler-calc__reset { margin-top: 12px; padding: 10px 0; border: 0; background: transparent; color: #2563eb; font: inherit; text-decoration: underline; cursor: pointer; }
.boiler-calc__sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
@media (max-width: 1000px) {
    .boiler-calc__layout { grid-template-columns: minmax(0, 1fr); gap: 24px; }
    .boiler-calc__result { position: static; }
}
@media (max-width: 630px) {
    .boiler-calc { margin-bottom: 70px; }
    .boiler-calc__result { padding: 18px; }
    .boiler-calc__option { margin: 0 12px; grid-template-columns: minmax(0, 1fr) 72px; gap: 8px; }
    .boiler-calc__row { grid-template-columns: minmax(0, 1fr); gap: 4px; }
    .boiler-calc__row strong { text-align: left; }
    .boiler-calc__total > strong { font-size: 23px; }
}