/* Блок «Как устроены двери SIGMA» (перенос с основного сайта, 11.10.2026) */
.sigma-anatomy {
  padding: 4.4rem 0 5.6rem;
  background: #f3f5fa;
}
.sigma-anatomy__title {
  margin: 0 0 .6rem;
  font-size: 3.2rem;
  font-weight: 600;
  line-height: 1.15;
  color: #111;
}
.sigma-anatomy__title span { color: #2a3fc4; }
.sigma-anatomy__lead {
  margin: 0 0 2.4rem;
  font-size: 1.5rem;
  color: rgba(17, 17, 17, .55);
}
.sigma-anatomy__grid {
  display: grid;
  grid-template-columns: minmax(0, 36%) minmax(0, 1fr);
  gap: 2.4rem;
  align-items: center;
}
.sigma-anatomy__visual {
  margin: 0;
  padding: 3rem 0;
  background: #fff;
  border-radius: 2rem;
  display: flex;
  justify-content: center;
}
.sigma-anatomy__stage {
  position: relative;
  width: min(60%, 26rem);
}
.sigma-anatomy__img {
  display: block;
  width: 100%;
  height: auto;
}
.sigma-anatomy__point {
  position: absolute;
  left: var(--x);
  top: var(--y);
  transform: translate(-50%, -50%);
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: 2px solid #fff;
  border-radius: 50%;
  background: #111;
  color: #fff;
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 .4rem 1.2rem rgba(0, 0, 0, .25);
  transition: background .2s, transform .2s, box-shadow .2s;
}
.sigma-anatomy__point.is-active {
  background: #2a3fc4;
  transform: translate(-50%, -50%) scale(1.15);
  box-shadow: 0 0 0 .6rem rgba(42, 63, 196, .18);
}
.sigma-anatomy__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.sigma-anatomy__item {
  display: flex;
  gap: 1.4rem;
  align-items: flex-start;
  width: 100%;
  padding: 1.4rem 1.8rem;
  border: 0;
  border-radius: 1.6rem;
  background: #fff;
  color: #111;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 .2rem .8rem rgba(17, 17, 17, .04);
  transition: background .2s, color .2s;
}
.sigma-anatomy__num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid rgba(17, 17, 17, .15);
  border-radius: 50%;
  font-size: 1.3rem;
  font-weight: 600;
}
.sigma-anatomy__copy { display: flex; flex-direction: column; gap: .3rem; }
.sigma-anatomy__copy strong { font-size: 1.6rem; font-weight: 600; }
.sigma-anatomy__copy span { font-size: 1.3rem; line-height: 1.4; color: rgba(17, 17, 17, .6); }
.sigma-anatomy__item.is-active { background: #2a3fc4; color: #fff; }
.sigma-anatomy__item.is-active .sigma-anatomy__num { background: #fff; color: #2a3fc4; border-color: #fff; }
.sigma-anatomy__item.is-active .sigma-anatomy__copy span { color: rgba(255, 255, 255, .85); }

@media (max-width: 899px) {
  .sigma-anatomy { padding: 3.2rem 0 4rem; }
  .sigma-anatomy__title { font-size: 2.4rem; }
  .sigma-anatomy__grid { grid-template-columns: 1fr; gap: 1.6rem; }
  .sigma-anatomy__visual { padding: 2.4rem 0; }
  .sigma-anatomy__stage { width: min(56%, 22rem); }
  .sigma-anatomy__point { left: var(--mx); top: var(--my); width: 2.6rem; height: 2.6rem; font-size: 1.2rem; }
  .sigma-anatomy__item { padding: 1.2rem 1.4rem; }
  .sigma-anatomy__copy strong { font-size: 1.5rem; }
}

@media (max-width: 899px) {
  /* На телефоне раскрыт только выбранный пункт — иначе блок на шесть экранов */
  .sigma-anatomy__item:not(.is-active) .sigma-anatomy__copy span { display: none; }
  .sigma-anatomy__item:not(.is-active) { align-items: center; }
}