.container {
  display: grid;
  grid-template-rows: 52px 1fr;
  grid-template-columns: 1fr;
  min-height: 100dvh;
}

.header-frame {
  grid-row: 1 / 2;
  grid-column: 1 / 2;
}

.header-pane {
  position: fixed;
  top: 0px;
  z-index: 999;
  width: 100%;
  background: linear-gradient(to right, #017FDB11, #FEE10111, #00A05011, #DDDBCE11, #CE326211);
  background-color: #FFFFFF;
  border-bottom: solid 1px;
  border-image: linear-gradient(to right, #017FDB, #FEE101, #00A050, #DDDBCE, #CE3262) 1;
}

header {
  position: sticky;
  height: 47px;
  display: grid;
  grid-template-columns: auto 11em;
  align-items: center;
  max-width: 1300px;
  margin: 0 auto 5px auto;
  padding: 0 10px;
  column-gap: .5em;
  overflow-y: hidden;
}

.main-frame {
  grid-row: 2 / 3;
  grid-column: 1 / 2;
  width: 100%;
}

.main-pane {
  display: grid;
  grid-template-rows: 1fr;
  grid-template-columns: 270px 1fr;
  max-width: 1300px;
  margin: 0 auto;
  background-color: #FFFFFF;
}

main {
  grid-row: 1 / 2;
  grid-column: 2 / 3;
  align-self: start;
  position: sticky;
  z-index: 99;
  background-color: #FFFFFF;
  /* padding: 0 10px 90px 10px; */
  padding: 0 10px 0px 10px;
  /* padding: 10px; */
}

.main-content {
  padding: 0.5em 0 2.5em 0;
  min-height: calc(100dvh - 52px - 1px - 41px - 26px);
}

nav {
  grid-row: 1 / 2;
  grid-column: 1 / 2;
  /* position: sticky; */
  /* position: absolute; */
  position: fixed;
  align-self: start;
  top: calc(52px + 1px);
  height: calc(100dvh - 52px - 1px);
  width: 270px;
  /* height: auto; */
  z-index: 999;
  padding: 10px;
  margin: 0px;
  overflow-x: hidden;
  overflow-y: auto;
  background-color: #FFFFFF;
  white-space: nowrap;
}

#menu {
  /*  visibility: hidden;*/
  display: none;
}

@media (width < 1024px) {
  header {
    grid-template-columns: 3em auto 11em;
  }

  main {
    grid-column: 1 / 3;
  }

  nav {
    left: -320px;
    transition: .5s;
    filter: drop-shadow(5px 5px 5px #BBBBBB);
    overflow-y: scroll;
    font-size: 1.4rem;
  }

  nav.navopen {
    left: 0;
  }

  /* メニュー */
  #menu {
    /*  visibility: visible;*/
    display: inline;
    font-size: 22pt;
    text-align: center;
  }

  #menu:hover {
    cursor: pointer;
  }

  header h1 {
    font-size: 16pt;
  }

  header h2 {
    font-size: 14pt;
  }

  header h1 img {
    display: none;
  }
}

#toToppage:hover {
  cursor: pointer;
}