.catalog {
  .page-header {
    margin-top: rem(-68);
    padding-bottom: 2rem;
  }

  .network-catalog {
    width: 100%;
  }

  .controls {
    width: 100%;
  }

  .filters,
  .search,
  .sort {
    width: 100%;
    border-top: solid 2px var(--accent, $brand-accent);

    a {
      display: flex;
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      padding: rem(16) rem(19);
      font-size: rem(16);
      font-weight: 600;
      font-family: $font-family-sans-serif;
      letter-spacing: rem(0.67);
      color: $black;
      transition: color 0.2s;

      &:hover,
      &:focus {
        background: #fafdff;
        color: var(--link, $brand-primary);
      }
    }

    ul {
      margin: 0;
      padding: 0;
      list-style: none;

      li {
        font-size: rem(16);
        font-family: $font-family-sans-serif;
        letter-spacing: rem(0.67);

        a {
          display: block;
          font-weight: normal;
        }

        a.is-active {
          font-weight: 600;
          color: var(--link, $brand-primary);
        }
      }
    }
  }

  .arrow {
    path {
      fill: var(--link, $brand-primary);
    }
  }

  .is-active > a .arrow {
    transform: rotate(180deg);
  }

  .filters {
    .filter-groups {
      display: none;
      border-top: solid 2px var(--accent, $brand-accent);

      h3 {
        margin: 0;
        border-top: solid 1px $light-gray;
      }

      h3:first-of-type {
        border-top: none;
      }
    }

    .filter-list {
      display: none;
    }

    &.is-active {
      .filter-groups {
        display: block;
      }
    }

    .is-active ul {
      display: block;
    }
  }

  .search {
    display: none;
  }

  .sort {
    border-bottom: solid 2px var(--accent, $brand-accent);

    .sorts {
      display: none;
    }

    &.is-active {
      .sorts {
        display: block;
      }
    }
  }

  .books {
    align-self: flex-start;
    width: percent(358, 360);
    margin: rem(32) 0 0 percent(10.5, 360);
    padding: 0;
  }

  .book {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    width: percent(165, 358);
    margin: 0 percent(9, 358) rem(8) 0;
    height: rem(230);
    float: left;
    padding: 1.5rem rem(8) rem(26);
    border: solid 2px var(--bg, $brand-accent);
    background: var(--bg, $brand-accent);

    p {
      margin: 0;
    }

    a {
      font-family: $font-family-sans-serif;
      color: $white;
      text-decoration: none;
    }

    .subject {
      height: rem(44);
      font-size: rem(14);
    }

    .title {
      height: rem(118);
      font-size: rem(16);
      font-weight: 600;
      line-height: (20/16);
    }

    .read-more {
      font-size: rem(14);
    }
  }
}

@media (min-width: 768px) {
  .catalog {
    .books {
      align-self: flex-start;
      width: percent(735, 768);
      margin-bottom: rem(15);
      margin-left: percent(24, 768);
    }

    .book {
      width: percent(230, 735);
      height: rem(260);
      margin: 0 percent(15, 735) 2rem 0;
      padding: 0 rem(14) rem(21.35);

      .subject {
        height: rem(45.85);
        font-size: rem(18);
      }

      .title {
        height: rem(147.65);
        font-size: rem(22);
        font-weight: 600;
        line-height: (40/30);
      }

      .read-more {
        font-size: rem(16);
      }
    }
  }
}

@media (min-width: $medium) {
  // TODO
}

@media (min-width: $large) {
  // TODO
}

@media (min-width: $extra-large) {
  .catalog {
    .main {
      width: rem(1535);
      margin: 0 auto;
    }

    .network-catalog {
      display: flex;
      flex-direction: row;
      align-items: flex-start;
      margin-top: rem(205);
    }

    .controls {
      width: percent(314, 1535);
    }

    .books {
      width: percent(1221.5, 1535);
      margin: 0 0 0 percent(2, 1535);
    }

    .book {
      width: percent(367, 1221.5);
      height: rem(386);
      margin: 0 0 2rem percent(39.5, 1221.5);
      padding: 1.5rem 1.85rem 2.1875rem;

      .subject {
        height: 4.625rem;
        font-size: rem(24);
      }

      .title {
        height: 13rem;
        font-size: rem(30);
        font-weight: 500;
        line-height: (40/30);
      }

      .read-more {
        font-size: rem(18);
      }
    }
  }
}