@media screen and (max-width: 768px) {
  .tb-none {
    display: none;
  }

  header {
    background: #fff;
    position: sticky;
    top: 0;
    left: 50%;
    z-index: 99;
    transform: none;
    width: 100%;
    border-radius: 0;
    margin: 0 auto;
    box-shadow: none;
    -webkit-border-radius: 0;
    -moz-border-radius: 0;
    -ms-border-radius: 0;
    -o-border-radius: 0;
    -webkit-transform: none;
    -moz-transform: none;
    -ms-transform: none;
    -o-transform: none;
  }

  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0 auto;
    padding: 1.5rem 3rem;
  }

  body {
    font-size: 1.5rem;
  }

  .nav-button {
    display: block;
    cursor: pointer;
  }

  .logo {
    z-index: 20;
  }

  /* ナビゲーションラッパー */
  .nav-wrap {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 10;
    display: none;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
  }

  /* ナビゲーションリスト */
  .nav-wrap .nav {
    position: relative;
    height: 100%;
    margin-top: 10.5rem;
    flex-direction: column;
    overflow-x: hidden;
    overflow-y: auto;
  }

  /* リストアイテム共通 */
  .nav-wrap .nav li {
    position: relative;
    display: block;
    z-index: 22;
    height: 6.5rem;
    margin: 0 3rem;
    border-bottom: solid 0.15rem currentColor;
  }

  .nav-wrap .nav li:last-child {
    border-bottom: none;
  }

  .nav-wrap .nav li.dropdown {
    width: calc(100% - 6rem);
    height: fit-content;
    padding: 1.5rem 0;
  }

  .dropdown::after {
    content: none;
  }

  .nav-wrap .nav .page-title{
    position: relative;
    display: flex;
    padding: 1.5rem 6rem 1.5rem 3rem;
    margin: 0;
    font-size: 20px;
    font-weight: bold;
  }

  .nav-wrap .nav li a::after {
    content: "";
    position: absolute;
    top: 50%;
    right: 3rem;
    box-sizing: border-box;
    width: 1.2rem;
    height: 1.2rem;
    border: solid 0.2rem;
    border-color: var(--text-color);
    border-left: none;
    border-bottom: none;
    transform: rotate(45deg) translate(-50%, -50%);
  }

  .nav-wrap .nav li a.page-title {
    padding: 0 3rem;
    margin-bottom: 0.6rem;
  }

  .nav-wrap .nav li a.page-title i {
    display: none;
  }

  /* ドロップダウンリスト */
  .dropdown-list {
    position: static;
    width: calc(100% - 3rem);
    padding: 0;
    background-color: transparent;
    border-radius: 0;
    filter: none;
    transform: scaleY(1);
    transform-origin: none;
    visibility: visible;
  }

  .dropdown:hover .dropdown-list {
    transform: translate(0);
  }

  /* ドロップダウンリストアイテム */
  .nav-wrap .nav li.dropdown-list-item {
    width: 100%;
    height: fit-content;
    margin-bottom: 0.5rem;
    border: none;
  }

  .nav-wrap .nav li.dropdown-list-item a {
    padding: 0;
    padding-right: 11px;
    font-size: 1.6rem;
    font-weight: 400;
    line-height: 1.75;
  }

  .nav-wrap .nav li.dropdown-list-item a small {
    line-height: 2.25;
  }

  .nav-wrap .nav li.dropdown-list-item a::after {
    width: 0.8rem;
    height: 0.8rem;
    border: solid 0.1rem;
    border-left: none;
    border-bottom: none;
  }

  button.button,
  a.button {
    margin: 0 auto 1rem;
  }

  /*メニューボタンのエフェクト*/
  .nav-button,
  .nav-button span {
    display: inline-block;
    transition: all 0.4s;
    box-sizing: border-box;
  }

  .nav-button {
    z-index: 20;
    position: relative;
    width: 40px;
    height: 36px;
  }

  .nav-button span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--text-color);
    border-radius: 4px;
  }

  .nav-button span:nth-of-type(1) {
    top: 0;
  }

  .nav-button span:nth-of-type(2) {
    top: 16px;
  }

  .nav-button span:nth-of-type(3) {
    bottom: 0;
  }

  .nav-button.active span:nth-of-type(1) {
    transform: translateY(16px) rotate(-45deg);
  }

  .nav-button.active span:nth-of-type(2) {
    opacity: 0;
  }

  .nav-button.active span:nth-of-type(3) {
    transform: translateY(-16px) rotate(45deg);
  }

  .whiteback {
    margin: 0 1rem;
  }

  .flex-container.whiteback {
    padding: 2rem;
    margin-bottom: 1.5rem;
    font-size: 16px;
  }

  .page-top__link li.service__link:nth-of-type(-n + 4) {
    flex-direction: column;
    width: 100%;
  }

  .btn-border-g {
    margin-top: 0.5rem;
  }

  .sec-servicelist-category .contents-mainttl {
    max-width: 20rem;
  }

  .detalist {
    display: flex;
    flex-wrap: wrap;
    padding: 0;
  }

  .detalist dt {
    width: 35%;
    padding: 1rem;
  }

  .detalist dd {
    width: 65%;
    padding: 1rem 0;
  }

  .detalist .map {
    width: 100%;
    min-width: auto;
  }

  /* about */

  .basic-policy .display-pc {
    display: none;
  }

  .basic-policy .display-tb {
    display: block;
    width: 85%;
    min-width: 400px;
    margin: auto;
  }

  .basic-policy .display-mb {
    display: none;
  }

  /* service */

  .service-tag,
  .btn-border-g {
    width: 97%;
    top: 2%;
    border-radius: 10rem;
  }

  h1.contents-mainttl span {
    margin-top: 5px;
  }

  .page-top__link {
    flex-direction: column;
    margin: 1rem 0;
  }

  .overview__link:first-child::after {
    content: none;
  }

  .page-top__link li {
    width: 100%;
  }



  .main-gradient-border {
    margin: 3rem;
    width: calc(100% - 2rem);
    height: 0.7rem;
  }

  .container-pagetop .service-top {
    background-size: 100%;
    min-height: 360px;
  }

  .survice-image__wrap {
    height: auto;
    padding: 0;
    margin-top: 10%;
  }

  .survice-image__wrap img {
    object-fit: cover;
    border-radius: 3rem;
  }

  .overview__pagelink ul {
    margin: 10% 0;
    padding: 0 2rem;
  }

  .contact-innerbox {
    height: 33rem;
    margin-bottom: 1.5rem;
  }

  .cf-area {
    display: block;
  }

  .cf-area dt {
    width: 100%;
    margin-bottom: 5px;
    padding-right: 0;
    text-align: left;
    line-height: 1.5em;
  }

  .cf-area dt p {
    flex-direction: row;
    align-items: center;
  }

  .cf-required {
    margin: 0 0.5rem;
  }

  /* コンタクト */

  .contents-box-contact .contents-box section {
    padding: 0;
  }

  /* ニュースアーカイブ */
  .filter-options {
    flex-direction: column;
  }

  .filter-option {
    width: 100%;
    text-align: center;
  }

  .news-archive-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-archive-item .day {
    margin-bottom: 0.5rem;
  }

  .pagination ul {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
/* 情報公開 */

  .disclosure-item li{
    width: calc(100%);
  }
}

@media screen and (max-width: 480px) {
  .sp-none {
    display: none;
  }

  .smart-slider-pc {
    display: none;
  }

  .smart-slider-mobile {
    display: block;
  }

  .contents-box-about {
    background-image: url("../img/about-backimg-sp.jpg");
    width: 100%;
    height: 680px;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .basic-policy .display-pc {
    display: none;
  }

  .basic-policy .display-tb {
    display: none;
  }

  .basic-policy .display-mb {
    display: block;
    max-width: 250px;
    width: 85%;
    margin: auto;
  }

  .timeline-year {
    margin: 0.5rem 0;
  }

  .timeline-inner {
    margin-bottom: 1rem;
  }

  .timeline-inner__content {
    flex-direction: column;
    padding-left: 2rem;
    margin-bottom: 0;
  }

  .timeline-inner__content::after {
    content: none;
  }

  .timeline-inner__content .timeline-date {
    margin-bottom: 0;
  }

  .timeline-inner__content .timeline-text {
    width: 100%;
    margin-bottom: 0;
  }

  .timeline-inner__content .timeline-text::before {
    content: none;
  }

  .contents-box-service h4 {
    min-height: 0;
    margin-bottom: 1rem;
  }

  .contents-box-service p {
    margin: 0.25rem 0;
  }

  .sec-servicelist-category .contents-mainttl::after {
    width: 150%;
  }

  .sec-servicelist-category:first-of-type .contents-mainttl::after {
    width: 120%;
  }

  .contact-innerbox {
    width: 100%;
    height: auto;
  }

  .contact-innerbox-contents {
    position: unset;
    inset: 0;
    transform: none;
    margin: auto;
  }

  .footer-nav {
    display: none;
  }
}