@charset "UTF-8";
body {
  font-family: "Noto Sans JP", sans-serif;
  color: #231815;
  background-color: #fff; }

/*---------------------------
basic setting
---------------------------*/
@media screen and (min-width: 769px) {
  .sp {
    display: none !important; } }
@media screen and (max-width: 768px) {
  .pc {
    display: none !important; } }
/*ボックスサイジング ボーダーボックス*/
*, *:before, *:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -o-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box; }

.text {
  color: #231815;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5; }

.justify_text {
  text-align: justify;
  text-justify: inter-ideograph; }
  @media all and (-ms-high-contrast: none) {
    .justify_text {
      font-feature-settings: normal; } }

body {
  color: #231815; }

a,
a:link,
a:visited {
  color: #231815;
  text-decoration: none; }

a:hover {
  opacity: 0.8;
  transition: all 0.8s; }

#backToTop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 60px;
  height: 60px;
  background: #111;
  border-radius: 14px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  /* ▼ 矢印は画像で表示 */ }
  @media (max-width: 768px) {
    #backToTop {
      right: 3vw;
      bottom: 3vw;
      width: 10vw;
      height: 10vw; } }
  #backToTop .arrow {
    width: 30px;
    height: 30px;
    background-image: url("../img/arrow.png");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center; }
    @media (max-width: 768px) {
      #backToTop .arrow {
        width: 7vw;
        height: 7vw; } }
  #backToTop:hover {
    background: #222; }

/* ▼ スクロール後に表示 */
#backToTop.show {
  opacity: 1;
  visibility: visible; }

/*---------------------------
sec
---------------------------*/
.sec {
  width: 100%;
  max-width: 980px;
  margin: 0 auto; }
  @media (max-width: 768px) {
    .sec {
      width: 100%; } }

header {
  position: fixed;
  /* ← 上部固定のまま */
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  background-color: rgba(255, 255, 255, 0.85);
  /* ☆ header は fixed のままなので絶対に relative を上書きしない */
  /* ▼▼ drop-nav（完全再現版） ▼▼ */ }
  header .header__inner {
    position: relative;
    /* ← hamburger の absolute の基準はこっちにする */
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1em 1.5em; }
    @media (max-width: 768px) {
      header .header__inner {
        padding: 3vw 4vw; } }
    header .header__inner h1 {
      width: clamp(220px, 16%, 400px); }
      @media (max-width: 768px) {
        header .header__inner h1 {
          width: 40%; } }
      header .header__inner h1 a img {
        width: 100%;
        height: auto; }
    header .header__inner .gnav {
      width: 100%; }
      header .header__inner .gnav ul {
        display: flex;
        justify-content: flex-end;
        align-items: center; }
        header .header__inner .gnav ul li:not(:last-child) {
          margin-right: 3%; }
        header .header__inner .gnav ul li a {
          font-size: 1.2rem;
          font-weight: bold;
          color: #008cff; }
          @media (max-width: 768px) {
            header .header__inner .gnav ul li a {
              font-size: 3.5vw; } }
  header .drop-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    text-align: center;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.5s ease, opacity 0.3s ease;
    /* PC & SP 共通 */
    /* --- 展開時 --- */
    /* SP 調整（スマホ時の縮小） */ }
    header .drop-nav ul {
      padding: 50px 0;
      /* 上下余白が大きい */
      margin: 0; }
      header .drop-nav ul li {
        list-style: none;
        margin: 22px 0;
        /* 行ごとの余白 */ }
        header .drop-nav ul li a {
          color: #c40000;
          font-size: 24px;
          /* PCの基準 */
          font-weight: 700;
          /* 太文字 */
          letter-spacing: 0.05em;
          /* ほんのり広め */
          text-decoration: none;
          display: inline-block; }
    header .drop-nav.active {
      max-height: 600px;
      /* 余裕を持たせる */
      opacity: 1; }
    @media (max-width: 768px) {
      header .drop-nav ul {
        padding: 20px 0; }
        header .drop-nav ul li a {
          font-size: 20px;
          letter-spacing: 0.04em; } }
  header .hamburger {
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    width: 50px;
    height: 25px;
    background: none;
    cursor: pointer;
    z-index: 1001;
    border: none; }
    @media (max-width: 768px) {
      header .hamburger {
        width: 35px;
        height: 18px; } }
    header .hamburger span {
      position: absolute;
      top: 50%;
      left: 0;
      width: 100%;
      height: 5px;
      background: #000;
      transition: .3s ease;
      transform-origin: center;
      /* PC用初期位置 */
      /* SP用初期位置（完全に中央揃え） */ }
      @media (max-width: 768px) {
        header .hamburger span {
          height: 3px; } }
      header .hamburger span:nth-child(1) {
        transform: translateY(-10px); }
      header .hamburger span:nth-child(2) {
        transform: translateY(0); }
      header .hamburger span:nth-child(3) {
        transform: translateY(10px); }
      @media (max-width: 768px) {
        header .hamburger span:nth-child(1) {
          transform: translateY(-6px); }
        header .hamburger span:nth-child(2) {
          transform: translateY(0); }
        header .hamburger span:nth-child(3) {
          transform: translateY(6px); } }
    header .hamburger.active span:nth-child(1) {
      transform: translateY(0) rotate(45deg); }
    header .hamburger.active span:nth-child(2) {
      opacity: 0; }
    header .hamburger.active span:nth-child(3) {
      transform: translateY(0) rotate(-45deg); }

/*---------------------------
共通 footer
---------------------------*/
/*404ページ*/
.error404 h2 {
  margin-top: 100px;
  font-size: 2rem;
  text-align: center; }
.error404 .text {
  margin-top: 100px;
  text-align: center; }
.error404 .btn {
  margin-bottom: 150px; }