:root {
  --blue: #003162;
  --pink: #fec1ae;
  --pink2: #faeae4;
}
body{
  width: 100%;
  -webkit-text-size-adjust: 100%;
}
.flex{
  display: flex;
  justify-content: flex-start;
}
.flex.j-center{
  justify-content: center;
}
/* 
AndroidのFireFoxにてh3、h4、pタグの文字のみ大きく表示されてしまう症状がみられた
原因として
Firefoxは、画面の横幅いっぱいに広がる長文（display: block; の要素）に対して「読みづらいだろう」と判断して文字を大きくします。
もし、該当の h3 や p、dl が入っている外枠（親要素の div など）に横幅（width）が固定で指定されていたり、構造上ブロック要素が連続している場合、その親要素に対して以下のCSSを試してみてください。
by Gemini
とのことだったので、該当タグをflex要素にした
（26.6.1）
 */

.blue,
.blue a{
  color: var(--blue);
}
.font-1_6em{
  font-size: 1.6em;
}
.font-1_8em{
  font-size: 1.8em;
}
.font-2em{
  font-size: 2em;
}

/* ***** sec_about ***** */
#sec_about .leftArea .box{
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin: 20px auto;
}
#sec_about .leftArea .box .list li{
  position: relative;
  padding-left: 15px;
}
#sec_about .leftArea .box .list li::before{
  position: absolute;
  display: block;
  content: "";
  top: 50%;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--blue);
  border-radius: 50%;
  transform: translateY(-50%);
}
#sec_about .leftArea .borderBox{
  background: #fff;
  padding: 4px;
}
#sec_about .leftArea .borderBox .inner{
  display: flex;
  justify-content: flex-start;
  align-items: center;
  font-size: 1.75em;
  line-height: 1.5;
  font-weight: bold;
  color: var(--blue);
  border: solid 1px var(--pink);
  padding: 10px 13px;
}
#sec_about .leftArea .borderBox .inner img{
  margin-right: 8px;
}

/* ***** sec_service ***** */
#sec_service .inner{
  background: var(--pink2);
  border-radius: 10px;
  padding: 30px;
}
#sec_service .serviceList{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-gap: 21px 55px;
}
#sec_service .serviceList li{
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  background: #fff;
  border-radius: 5px;
  box-shadow: 
    2px 2px 0px 2px #bfcbd8, 
    4px 4px 0px 3px #bfcbd8,
    6px 6px 0px 3px #bfcbd8;
  padding: 20px;
}
#sec_service .serviceList li::before,
#sec_service .serviceList li::after{
  position: absolute;
  display: block;
  content: url(../img/service/kokoshia_vns/service_bg.png);
  width: 20px;
  height: 20px;
  z-index: 1;
}
#sec_service .serviceList li::before{
  bottom: 5px;
  left: 5px;
}
#sec_service .serviceList li::after{
  top: 5px;
  right: 5px;
  transform: rotate(180deg);
}
#sec_service .serviceList li .text,
#sec_service .serviceList li .img{
  position: relative;
  z-index: 2;
}
#sec_service .serviceList li .text h4{
  font-size: 1.142em;
  color: var(--blue);
  margin-bottom: 10px;
}
#sec_service .serviceList li .text p{
  font-size: 1em;
  line-height: 1.7;
  margin-bottom: 0;
}
#sec_service .serviceList li .img{
  display: flex;
  margin-left: 20px;
}

/* ***** sec_flow ***** */
#sec_flow .inner{
  background: #fff;
  border: solid 1px var(--pink);
  border-radius: 10px;
  padding: 20px 30px;
  box-sizing: border-box;
}
#sec_flow .flow{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 50px;
}
#sec_flow .flow li{
  position: relative;
  width: 100%;
  border-right: solid 1px var(--blue);
  border-bottom: solid 1px var(--blue);
  padding: 0 5px 5px 0;
  box-sizing: border-box;
}
#sec_flow .flow li::before{
  position: absolute;
  display: block;
  content: "";
  top: 0;
  left: 0;
  width: calc(100% - 5px);
  height: calc(100% - 5px);
  background: #f5f5ed;
  clip-path: polygon(
    28px 0,
    100% 0,
    100% 100%,
    0 100%,
    0 20px
  );
  z-index: 1;
}
#sec_flow .flow li + li::after{
  position: absolute;
  display: block;
  content: "";
  top: 50%;
  left: -25px;
  width: 0;
  height: 0;
  border-style: solid;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 10px solid var(--pink);
  border-right: 0;
  transform: translate(-50%, -50%);
}
#sec_flow .flow li .box{
  position: relative;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  width: 100%;
  height: 100%;
  padding: 25px 14px 14px;
  box-sizing: border-box;
  z-index: 2;
}
#sec_flow .flow li .box .num{
  position: absolute;
  top: -2px;
  left: 5px;
  z-index: 3;
}
#sec_flow .flow li .box p{
  font-size: 1em;
  line-height: 1.7;
  color: var(--blue);
  margin-bottom: 0;
}

/* ***** promoArea ***** */
#promoArea{
  height: 180px;
  background: var(--blue);
  padding: 5px;
  box-sizing: border-box;
}
#promoArea address {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 850px;
  height: 170px;
  border: solid 1px #fff;
  margin: 0;
}