html {
  scroll-behavior: smooth;
}

body.page-filters {
  margin: 0;
  color: #333;
  background: #efefef;
}

.filters-page {
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

.filters-page h1 {
  font-size: 26px;
  margin: 0 0 20px;
}

.abc {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0 0 28px;
  padding: 20px 14px;
  background: #ebebeb;
  position: sticky;
  top: 0;
  z-index: 5;
}

.abc a {
  display: inline-block;
  min-width: 22px;
  text-align: center;
  padding: 3px 6px;
  font-size: 13px;
  color: #333;
  text-decoration: none;
}

.abc a:hover {
  background: #e67e22;
  color: #fff;
}

.substance-letter-heading {
  font-size: 24px;
  margin: 32px 0 10px;
  padding-top: 5px;
  padding-bottom: 6px;
  border-bottom: 1px solid #b4b6b7;
  scroll-margin-top: 70px;
  font-weight: 400;
}

.chooseItemsList {
  list-style: none;
  margin: 0;
  padding: 0;
}

.chooseItemsItem {
  border-bottom: 1px solid #eee;
}

.chooseItemsItemLink {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 6px;
  text-decoration: none;
  color: #222;
  position: relative;
}

.chooseItemsItemLink.is-clickable {
  cursor: pointer;
}

.chooseItemsItemLink.is-clickable:hover {
  background: #fafafa;
}

.chooseItemsItemLink.is-disabled {
  cursor: default;
  color: #555;
}

.chooseItemsItemName {
  flex: 1 1 auto;
  font-size: 15px;
}

.chooseItemsItemFormula {
  flex: 0 0 140px;
  font-size: 13px;
  color: #666;
}

.chooseItemsItemState {
  flex: 0 0 130px;
  font-size: 13px;
  color: #777;
}

.chooseItemsItemMark {
  flex: 0 0 90px;
  font-weight: 600;
  color: #e67e22;
  text-align: right;
}

.chooseItemsItemMark.is-empty {
  color: #bbb;
  font-weight: 400;
}

.chooseItemsItemPopup {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 4px;
  width: 300px;
  background: #2c3e50;
  color: #fff;
  padding: 12px 14px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.45;
  z-index: 20;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

.chooseItemsItemPopup::before {
  content: "";
  position: absolute;
  top: -5px;
  right: 20px;
  border-width: 0 6px 6px 6px;
  border-style: solid;
  border-color: transparent transparent #2c3e50 transparent;
}

.chooseItemsItemPopup b {
  color: #f5a742;
}

.chooseItemsItemPopup ul {
  margin: 6px 0 0;
  padding-left: 16px;
}

.chooseItemsItemPopup li {
  margin-bottom: 3px;
}

.chooseItemsItemLink:hover .chooseItemsItemPopup {
  display: block;
}

.substanceCards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 16px 0 40px;
}

.substanceCard {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 0 18px 14px;
  border-bottom: 1px solid #ffffff;
  border-top: 1px solid #b4b6b7;
  border-left: 1px solid #b4b6b7;
  border-right: 1px solid #ffffff;
  background: #efefef;
  text-decoration: none;
  color: inherit;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.substanceCard.is-clickable {
  cursor: pointer;
}

.substanceCard.is-clickable:hover {
  border-color: #f87c16;
}

.substanceCard.is-disabled {
  opacity: 0.55;
}

.substanceCard__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.substanceCard__name {
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
}

.substanceCard__mark {
  flex-shrink: 0;
  padding: 4px 10px;
  border-radius: 0;
  background: #f87c16;
  color: #fff;
  font-weight: 600;
  font-size: 13px;
}

.substanceCard__mark.is-empty {
  background: #ececec;
  color: #999;
}

.substanceCard__formula {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 15px;
  color: #555;
  font-weight: 600;
}

.substanceCard__formulaIcon {
  flex-shrink: 0;
  width: 15px;
  height: 15px;
  fill: currentColor;
  transform: rotate(150deg);
}

.substanceCard__state {
  font-size: 13px;
  color: #999;
  text-transform: lowercase;
}

.substanceCard__popup {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 100%;
  z-index: 9999;
  margin-bottom: 8px;
  padding: 14px 16px;
  border-radius: 0;
  background: #1e1e1e;
  color: #fff;
  font-size: 13px;
  line-height: 1.5;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.substanceCard__popup::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 24px;
  border: 7px solid transparent;
  border-top-color: #1e1e1e;
}

.substanceCard:hover .substanceCard__popup {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.substanceCard__popup b {
  color: #f87c16;
}

.substanceCard__popup ul {
  margin: 8px 0 0;
  padding-left: 18px;
}

/* АДАПТИВ */
@media (max-width: 1440px) {
  .filters-page {
    padding: 24px 40px 60px;
  }
}

@media (max-width: 1200px) {
  .filters-page {
    padding: 24px 32px 56px;
  }
  .filters-page h1 {
    font-size: 24px;
  }
  .substanceCards {
    grid-template-columns: repeat(3, 1fr);
  }
  .chooseItemsItemFormula {
    flex-basis: 120px;
  }
  .chooseItemsItemState {
    flex-basis: 110px;
  }
}

@media (max-width: 960px) {
  .filters-page {
    padding: 22px 24px 52px;
  }
  .filters-page h1 {
    font-size: 22px;
    margin-bottom: 16px;
  }
  .substanceCards {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin: 14px 0 32px;
  }
  .substanceCard {
    padding: 16px 0 16px 12px;
  }
  .substanceCard__name {
    font-size: 16px;
  }
  .substance-letter-heading {
    font-size: 22px;
    margin: 26px 0 8px;
  }

  .chooseItemsItemFormula,
  .chooseItemsItemState {
    display: none;
  }
  .chooseItemsItemPopup {
    width: 260px;
  }
}

@media (max-width: 680px) {
  .filters-page {
    padding: 18px 20px 44px;
  }
  .filters-page h1 {
    font-size: 20px;
    margin-bottom: 14px;
  }

  .abc {
    padding: 12px 10px;
    gap: 3px;
    margin-bottom: 20px;
  }
  .abc a {
    font-size: 12px;
    min-width: 20px;
    padding: 3px 5px;
  }

  .substance-letter-heading {
    font-size: 20px;
    margin: 22px 0 8px;
    scroll-margin-top: 56px;
  }

  .substanceCards {
    grid-template-columns: 1fr;
    gap: 10px;
    margin: 12px 0 28px;
  }

  .substanceCard {
    padding: 14px 0 14px 12px;
  }
  .substanceCard__name {
    font-size: 15px;
  }
  .substanceCard__mark {
    font-size: 12px;
    padding: 3px 8px;
  }
  .substanceCard__formula {
    font-size: 14px;
  }
  .substanceCard__state {
    font-size: 12px;
  }
  .substanceCard__popup {
    font-size: 12px;
    padding: 12px 14px;
  }

  .chooseItemsItemLink {
    padding: 10px 4px;
    gap: 10px;
  }
  .chooseItemsItemName {
    font-size: 14px;
  }
  .chooseItemsItemMark {
    flex-basis: 70px;
    font-size: 13px;
  }
  .chooseItemsItemPopup {
    width: 220px;
    font-size: 12px;
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .filters-page {
    padding: 14px 10px 36px;
  }
  .filters-page h1 {
    font-size: 18px;
    margin-bottom: 12px;
  }

  .abc {
    padding: 10px 8px;
  }
  .abc a {
    font-size: 11px;
    min-width: 18px;
    padding: 2px 4px;
  }

  .substance-letter-heading {
    font-size: 18px;
    margin: 18px 0 6px;
  }

  .substanceCard {
    padding: 12px 0 12px 10px;
  }
  .substanceCard__name {
    font-size: 14px;
  }
  .substanceCard__mark {
    font-size: 11px;
    padding: 2px 6px;
  }
  .substanceCard__formula {
    font-size: 13px;
  }
  .substanceCard__formulaIcon {
    width: 13px;
    height: 13px;
  }

  .chooseItemsItemLink {
    padding: 8px 2px;
    gap: 8px;
  }
  .chooseItemsItemMark {
    flex-basis: 60px;
    font-size: 12px;
  }
  .chooseItemsItemPopup {
    width: 180px;
    right: -4px;
    font-size: 11px;
    padding: 8px 10px;
  }
  .chooseItemsItemPopup::before {
    right: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .substanceCard,
  .substanceCard__popup {
    transition: none;
  }
}