:root {
  --flex-container-gap: 30px;
}

@media screen and (min-width: 700px) {
  article.art-item {
    width: calc((100% - var(--flex-container-gap)) / 2);
  }
}

#main .sec {
  padding: 30px 0;
}

@media screen and (min-width: 1000px) {
  #main .sec {
    padding: 60px 0;
  }
}

.flex-container.row-container {
  display: flex;
  flex-direction: column;
  gap: var(--flex-container-gap);
  flex-wrap: wrap;
}

.flex-container.row-container .sec-head {
  padding: 20px 20px 20px calc(20px + 4%);
  position: relative;
  margin: 0;
  align-self: flex-start;
}

.flex-container.row-container .sec-head::before {
  content: "";
  display: block;
  position: absolute;
  top: 50%;
  left: 0;
  width: 4px;
  height: 100%;
  border-radius: 5px;
  transform: translate(0, -50%);
  background-color: #333333dd;
}


@media screen and (min-width: 700px) {
  .flex-container.row-container {
    flex-direction: row;
  }

  .flex-container.row-container .sec-head {
    width: 100%;
    flex-shrink: 0;
    padding: 2% 2% 2% 4%;
  }

  

  .flex-container.row-container article.art-item {
    width: calc((100% - var(--flex-container-gap)) / 2);
  }
}

@media screen and (min-width: 1000px) {
  .flex-container.row-container {
    flex-wrap: nowrap;
  }

  .flex-container.row-container .sec-head {
    width: 40%;
  }

  .flex-container.row-container .sec-head::before {
    left: 4%;
  }

  .flex-container.row-container article.art-item {
    width: 100%;
  }
}


.flex-container.row-container article.art-item {
  flex-direction: row;
  gap: 5%;
  padding: 1.5em;
}

.flex-container.row-container article.art-item {
  flex-direction: row;
  gap: 5%;
  padding: 1.5em;
}

.flex-container.row-container article.art-item .art-tmb {
  width: 40%;
}

@media screen and (min-width: 700px) {
  .flex-container.row-container article.art-item {
    flex-direction: column;
    gap: 1.5em;
    padding: 2%;
  }

  .flex-container.row-container article.art-item .art-tmb {
    width: 100%;
  }
}

/* #sec01 */
#sec01 .flex-container {
  display: flex;
  flex-direction: column;
  gap: var(--flex-container-gap);
  flex-wrap: wrap;
}

#sec01 .sec-head {
  margin-bottom: 50px;
}


@media screen and (min-width: 700px) {
  #sec01 .flex-container {
    flex-direction: row;
  }
}

/* #sec02 */
#sec02 {
  background-color: #00000008;
}

/* #sec03 */
@media screen and (min-width: 1000px) {
  #sec03 .flex-container > :nth-child(1){
    order: 3;
  }
  #sec03 .flex-container > :nth-child(2){
    order: 1;
  }
  #sec03 .flex-container > :nth-child(3){
    order: 1;
  }
}