html {
  font-size: 62.5%;
}

body {
  line-height: 1.8;
  font-family:
    "Noto Sans JP",
    -apple-system,
    BlinkMacSystemFont,
    "メイリオ",
    sans-serif;
  -webkit-font-smoothing: subpixel-antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #333;
  font-size: 1.6rem;
  background: #fff;
  font-size: 62.5%;
}

@media screen and (max-width: 903px) {
  body {
    font-size: 1.4rem;
  }
}

img {
  max-width: 100%;
  height: auto;
}

/* --------------------------------------------------------------------------
   Header & Navigation (PC：横並びスタイル)
   -------------------------------------------------------------------------- */

.main-visual__header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 0 20px;
  z-index: 1000;
  box-sizing: border-box;
  background: transparent;
  opacity: 1;
  transition:
    opacity 0.8s ease-in-out,
    background 0.5s ease;
}

.main-visual__header.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.main-visual__header.is-scrolled {
  position: fixed;
  background: rgba(10, 41, 134, 0.95);
  animation: slideDown 0.4s ease forwards;
}

.main-visual__header.is-scrolled .main-visual__header__logo {
  padding: 16px 0;
}

.main-visual__header.is-scrolled .main-visual__header__logo-img {
  width: 80px;
}

.main-visual__header.is-scrolled .main-visual__nav-link {
  font-size: 14px;
}

.main-visual__header-inner {
  display: flex;
  width: 100%;
  margin: 0 auto;
  justify-content: space-between;
  align-items: center;
}

.main-visual__header__logo {
  display: table-cell;
  vertical-align: middle;
  padding: 30px 0;
  box-sizing: border-box;
  font-family: "Arial", sans-serif;
  font-size: 20pt;
  font-weight: bold;
  color: #ffffff;
  text-align: left;
}

.main-visual__header__logo-img {
  width: 100px;
  height: auto;
  display: block;
}

.main-visual__nav {
  display: table-cell;
  vertical-align: middle;
  text-align: right;
}

.main-visual__nav-list {
  display: inline-block;
  margin: 0;
  padding: 0;
  list-style: none;
}

.main-visual__nav-item {
  display: inline-block;
  margin-left: 32px;
}

.main-visual__nav-link {
  font-family: "Arial", sans-serif;
  font-size: 16px;
  font-weight: bold;
  color: #ffffff;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.main-visual__nav-link:hover {
  opacity: 0.7;
}

.main-visual__menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 22px;
}

.main-visual__menu-line {
  display: block;
  width: 100%;
  height: 3px;
  background-color: #ffffff;
  margin-bottom: 5px;
  border-radius: 2px;
  transition:
    transform 0.3s,
    opacity 0.3s;
}
.main-visual__menu-line:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Responsive (スマホ・タブレット環境)
   ========================================================================== */
@media screen and (max-width: 768px) {
  .main-visual__header-inner {
    width: 100%;
  }

  .main-visual__header__logo {
    display: table-cell;
    vertical-align: middle;
    width: auto;
    text-align: left;
  }

  .main-visual__nav {
    display: table-cell;
    vertical-align: middle;
    text-align: right;
  }

  .main-visual__nav-list {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(10, 41, 134, 0.98);
    padding: 0;
    text-align: center;
    z-index: 999;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  }

  .main-visual__nav-list.open {
    display: block !important;
  }

  .main-visual__nav-item {
    display: block;
    margin: 24px 0;
    margin-left: 0;
  }

  .main-visual__nav-link {
    font-size: 18px !important;
    display: block;
    width: 100%;
  }

  .main-visual__menu-btn {
    display: table-cell;
    vertical-align: middle;
    width: 30px;
    text-align: right;
    position: relative;
    z-index: 1001;
  }

  .main-visual__menu-btn.active .main-visual__menu-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .main-visual__menu-btn.active .main-visual__menu-line:nth-child(2) {
    opacity: 0;
  }
  .main-visual__menu-btn.active .main-visual__menu-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .main-visual__inner {
    display: block;
  }

  .main-visual__text-content,
  .main-visual__illust-content {
    display: block;
    width: 100%;
    padding: 0;
    text-align: center;
  }

  .main-visual__text-content {
    margin-bottom: 40px;
  }

  .main-visual__heading {
    font-size: 28pt;
  }

  .main-visual__btn {
    margin: 8px;
  }
}

.common-list {
  margin-top: 10px;
}

.common-list-item {
  position: relative;
  padding-left: 1.2em;
  line-height: 1.6;
}

.common-list-item:before {
  content: "・";
  position: absolute;
  left: 0;
  top: 0;
}

/* --------------------------------------------------------------------------
   その他のコンポーネントスタイル
   -------------------------------------------------------------------------- */

.sub_ttl {
  font-size: 2.2rem;
  font-weight: 600;
  padding-bottom: 20px;
  position: relative;
  border-bottom: 3px solid #9eaec3;
  margin-bottom: 90px;
}

.sub_ttl:before {
  position: absolute;
  content: "";
  width: 130px;
  height: 3px;
  background: #0a2986;
  bottom: -3px;
}

.footer {
  background: linear-gradient(135deg, #1b53c0 0%, #0a2986 60%, #071536 100%);
  font-size: 1.2rem;
  padding: 25px 0;
}

@media screen and (max-width: 903px) {
  .footer {
    padding: 10px 0;
  }
}

.footer_list {
  flex-direction: row;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

@media screen and (max-width: 903px) {
  .footer_list {
    flex-direction: column;
  }
}

.footer_list li {
  margin-right: 20px;
}

.pagetop {
  display: none;
  position: fixed;
  bottom: 30px;
  right: 15px;
}
.pagetop a {
  display: block;
  background-color: #ccc;
  text-align: center;
  color: #222;
  font-size: 16px;
  text-decoration: none;
  padding: 5px 10px;
  filter: alpha(opacity=50);
  -moz-opacity: 0.5;
  opacity: 0.5;
}
.pagetop a:hover {
  display: block;
  text-align: center;
  color: #fff;
  font-size: 16px;
  text-decoration: none;
  padding: 5px 10px;
  -moz-opacity: 0.5;
  opacity: 0.5;
}

.bg {
  background: #eff3f7;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}