body {
  font-family: 'Noto Sans JP', sans-serif;
}

/*
  枠組み
============================*/
.inner {
  width: min(1280px, 100%);
  padding-inline: 20px;
  margin-inline: auto;
}
.inner.--normal {
  width: min(1080px, 100%);
  margin-inline: auto;
}
.inner.--narrow {
  width: min(840px, 100%);
  margin-inline: auto;
}

/*
  (説明見出し用) ヘッダー
============================*/
.c-explain-header {
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  width: 100%;
  height: 40px;
  background: #333;
  display: flex;
  align-items: center;
  justify-content: center;
}
.c-explain-header__text {
  color: #fff;
  text-align: center;
  font-size: 14px;
  line-height: 1.5;
  font-weight: 700;
}

/*
  見出し
============================*/
h2.c-title__h2 {
  font-size: 32px;
  line-height: 1.8;
  font-weight: 700;
  padding-bottom: 10px;
  border-bottom: 2px solid #000;
  margin-bottom: 40px;
  padding-left: 20px;
}
h2.c-title__h2.--white {
  color: #fff;
  border-bottom: 2px solid #fff;
}
h3.c-title__h3 {
  font-size: 28px;
  line-height: 1.8;
  font-weight: 700;
  margin-bottom: 40px;
  padding-left: 32px;
  position: relative;
}
h3.c-title__h3.--white {
  color: #fff;
}
h3.c-title__h3::after {
  position: absolute;
  content: '';
  top: 0;
  left: 0;
  width: 8px;
  height: 100%;
  background: #000;
}
h4.c-title__h4 {
  font-size: 24px;
  line-height: 1.8;
  font-weight: 700;
  margin-bottom: 40px;
}