.m-heading-01 {
  background: url(/product_floor/toughtectile/concept/img/bg_ttl.jpg) no-repeat 50%/cover;
}

.concept {
  padding-top: 60px;
}

.concept__logo {
  width: 80px;
  margin: 0 auto 25px;
}

.concept__ttl {
  margin-bottom: 10px;
  font-size: 3.4rem;
  font-weight: 500;
  letter-spacing: .078em;
  text-align: center;
}

.concept__txt {
  line-height: 2.875;
  letter-spacing: .046em;
  text-align: center;
}

.concept-img {
  margin: 50px 0 40px;
  text-align: center;
}

@media screen and (min-width: 768px) {
  .concept {
    padding-top: 120px;
  }
  .concept__logo {
    width: 130px;
    margin-bottom: 50px;
  }
  .concept__ttl {
    margin-bottom: 20px;
    font-size: 5.2rem;
  }
  .concept-img {
    position: relative;
    margin: 100px -100px 90px;
  }
  .concept-img::before {
    content: "";
    z-index: -1;
    position: absolute;
    top: 0;
    left: 50%;
    width: 100%;
    height: 256px;
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
    background-color: #d9e1e2;
  }
}