@charset "UTF-8";

/*----------------------------------------
	header
----------------------------------------*/
.round-bottom {
  position: relative;
  width: 100%;
  background-color: var(--blue);
  margin-bottom: 13rem;
}
.round-bottom::after {
  content: "";
  position: absolute;
  bottom: -5rem;
  left: 0;
  width: 100%;
  height: 10rem;
  background-color: var(--blue);
  clip-path: ellipse(60% 100% at 50% 0);
  z-index: -1;
}
h1{
  color: var(--white);
  font-weight: 600;
  font-size:min(7.2vw,2.8rem);
}
h1 > span{
  display: block;
}
h1 strong{
  font-weight: 700;
  background:linear-gradient(transparent 85%, rgba(255,230,126,.8) 85%);
}
.h1-text03{
  margin-top: -.15em;
}
header figure{
  width: 90%;
  max-width: 380px;
  text-align: center;
  margin: auto;
}
.header-container{
  display: flex;
  flex-direction: column;
  width: min(90%,900px);
  margin: auto auto -5rem;
  row-gap:1rem;
  padding-top: 3rem;
  text-align: center;
}
.header-btn{
  text-align: center;
  max-width: 26em;
  margin: 2rem auto;
}


/*----------------------------------------
	main
----------------------------------------*/
main{
  margin:0 auto;
  width: min(90%,900px);
  counter-reset: section; /* カウンターをリセット */
}
main h2{
  font-size: min(6.6vw,2.8rem);
  margin-top: 6rem;
  line-height: 1.4;
  display: flex;
  gap:.25em;
}
main h2::before{
  color: var(--navy);
  color: var(--blue);
  font-size: 1.4em;
  counter-increment: section;
  content: counter(section)".";
  font-weight: 500;
  transform: translateY(-.3em);
}
main section{
  margin-top: 3rem;
  margin-bottom: 6rem;
}
main p{
  line-height: 1.8;
  margin-top: 1em;
  text-align: justify;
}
main figure{
  margin: 2rem auto 0;
  width: 100%;
  max-width: 64rem;
}

/* ①ガス補充って本当に必要？ */
.list-need {
  font-size: min(4.62vw,1.9rem);
  font-weight: 600;
  line-height: 1.4;
}
.list-need li{
  border: 2px solid #ccc;
  padding:.5em .75em;
  border-radius: 1em;
  display: flex;
  gap:.5em;
  align-items: center;
  margin-top: 1em;
  background: rgba(255,230,126,.3);
}
.list-need li::before{
  content:"";
  background: url(../img/icon_atten.svg) no-repeat left top/cover;
  width: 1em;
  height: 1em;
  flex-shrink: 0;
  display: inline-block;
  align-self: flex-start;
  transform: translateY(.15em);
}

/* ②ガス不足のサイン */
.sign-table{
  border-collapse: collapse;
  width: 100%;
  margin-top: 1em;
  background: var(--white);
}
.sign-table th,
.sign-table td{
  padding: .5em;
  border: 2px solid var(--blue-op50);
}
.sign-table td{
  font-size:1.7rem;
}
.sign-table thead th{
  background: var(--blue);
  color: var(--white);
  font-weight: inherit;
}
.sign-table thead th:first-child{
  border-right: 2px solid rgba(255,255,255,.5);
}
.sign-table tbody th{
  text-align: left;
  background:rgba(78, 185, 215,.1);
}
.sign-table tbody tr{
  border-bottom: 2px solid var(--blue);
  display: table-row;
}
.sign-table tbody tr:nth-child(even){
  background: var(--white);
}

/* ④Q&Aでさらに理解 */
.list-qa dt{
  display: flex;
  font-weight: 700;
  border-radius: .25rem;
  gap: .6em;
  align-items: center;
  margin:1em 0;
  background: var(--white);
  color: var(--navy);
}
.list-qa dt::before{
  font-size: 1.1em;
  content:"Q";
  background: var(--navy);
  color: var(--white);
  padding: .35em .65em;
  text-align: center;
  align-self:stretch;
}
.list-qa dd{
  margin-left: 3em;
}
.list-qa dd:not(:last-child){
  margin-bottom: 1.75em;
}



/* 強調 */
strong {
  font-weight: 700;
  background: linear-gradient(transparent 75%, var(--yellow) 75%);
}

/* ボタン */
.btn-wrap{
  text-align: center;
  max-width: 26em;
  margin: 6rem auto;
}


/*----------------------------------------
	その他
----------------------------------------*/
.wide{
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  padding-left: calc(50vw - 50%);
  padding-right: calc(50vw - 50%);
  padding-top: .5rem;
  padding-bottom: 6rem;
}
.bg-lightgray{
  background: var(--lightgray);
}

.max420{
  max-width: 420px;
}
.btn01{
  color: var(--white);
  display: block;
  padding: .7em 2.5em;
  border-radius: 1.5em;
  font-size: 1.05em;
  text-decoration: none;
  background:var(--navy);
}
.btn01.bg-blue{
  background:var(--blue);
}
.mt1em{
  margin-top: 1em;
}
.mb3rem{
  margin-bottom: 3rem;
}
.pb3rem{
  padding-bottom: 3rem;
}
.mb0{
  margin-bottom: 0;
}


/*----------------------------------------
	タブレット　768px以上
----------------------------------------*/
@media (min-width: 768px) {

  .header-container{
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
  }
  h1{
    text-align: left;
  }
  .header-btn{
    text-align:left;
  }
  .header-container .btn01{
    display: inline-block;
  }
  header figure{
    width: 35%;
    max-width: 400px;
  }
  
  /* ②ガス不足のサイン */
  .sign-table tbody th,
  .sign-table td{
    padding:.75em 1em;
  }

  

}

/*----------------------------------------
	PC　960px以上
----------------------------------------*/
@media (min-width: 960px) {
  header figure{
    width: 40%;
  }
  
}

/*----------------------------------------
	オンマウス
----------------------------------------*/
@media (hover: hover) {
  a{
    transition: .2s;
  }
  a:hover{
    opacity: .85;
  }
  
}