@media (max-width: 1100px) {
  .inner {
    padding: 0 2rem;
  }

  /* header */
  header li {
    padding: 0 0.5rem;
  }

  header li:last-child {
    margin-right: 1rem;
  }

  .phone p,
  .phone span {
    font-size: 1rem;
  }

  /* title */
  .title_box {
    top: 20%;
    right: 10%;
  }

  /* access */
  #access .flex {
    flex-wrap: wrap;
  }

  #access table,
  #access .map {
    width: 100%;
    margin: 0 auto;
  }

  #access table {
    margin-bottom: 1rem;
  }

  /* form */
  .form_box {
    width: 70%;
  }

  .form_title {
    width: 40%;
  }
}

@media (max-width: 799px) {
  .sp {
    display: block;
  }

  .inner {
    justify-content: flex-start;
  }

  /* header */
  header {
    width: calc(100% - 40px - 1.5rem);
  }

  header #nav_btn {
    position: fixed;
    top: 0;
    right: 0;
    padding: 10px 20px;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.5);
  }

  header #nav_btn img {
    width: 1.5rem;
  }

  header .menu_btn0 {
    display: block;
  }
  header .menu_btn1 {
    display: none;
  }
  header.nav_open .menu_btn0 {
    display: none;
  }
  header.nav_open .menu_btn1 {
    display: block;
  }

  header #gnav {
    float: none;
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    padding: 20px 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 9998;
    display: none;
  }

  header #gnav ul {
    display: block;
  }

  header li {
    margin: 2rem 0;
    text-align: center;
    border: none;
  }

  header li:last-child {
    margin-right: 0;
  }

  header nav a {
    margin: 0;
    color: #fff;
  }

  header button {
    display: block;
  }

  .phone {
    display: flex;
    align-items: center;
  }

  /* title */
  .title button {
    display: none;
  }

  .intro {
    width: 90%;
  }

  /* feature */
  #feature .box {
    flex-wrap: wrap;
  }

  #feature .text_box {
    width: 100%;
  }

  #feature .text_box:not(:last-child) {
    margin-bottom: 5rem;
  }
}

@media (max-width: 767px) {
  .is-fixed {
    overflow: hidden;
  }
}

@media (max-width: 599px) {
  .inner {
    padding: 0 1rem;
  }

  /* header */
  .logo {
    width: 30%;
  }

  /* course */
  #course .box,
  #course .box:nth-child(even) {
    flex-direction: column-reverse;
  }

  #course .img_box {
    width: 100%;
  }

  #course .text_box {
    width: 100%;
    margin-bottom: 1rem;
  }

  /* form */
  #form h2 {
    font-size: 1.5rem;
  }

  label {
    flex-direction: column;
  }

  .form_title {
    width: 60%;
    margin-bottom: 0.5rem;
  }

  input[type="text"],
  input[type="tel"],
  input[type="email"],
  input[type="date"],
  textarea {
    margin-left: 2rem;
  }

  /* footer */
  footer .inner {
    padding: 4rem 0;
  }

  footer .flex {
    display: none;
  }

  footer p {
    padding: 0;
  }

  #pagetop {
    bottom: 15px;
    right: 15px;
  }
}

@media (max-width: 499px) {
  /* header */
  header {
    width: 100%;
  }

  header .inner {
    flex-direction: column;
  }

  header #nav_btn {
    padding: 5px 10px;
  }

  /* title */
  .title_box {
    position: initial;
    text-align: center;
    margin-top: 1rem;
  }

  .title h1 {
    color: #000;
    text-shadow: none;
  }

  .title .sub {
    text-shadow: none;
  }

  /* access */
  #access table th {
    display: block;
    width: 100%;
  }

  #access table td {
    display: block;
    width: 100%;
    padding-left: 1rem;
  }

  tr td:last-child {
    margin-bottom: 1rem;
  }

  .train {
    display: flex;
    flex-wrap: wrap;
  }

  .train td {
    display: initial;
  }

  .line,
  .station {
    text-align: start;
  }

  /* form */
  #form h2::before,
  #form h2::after {
    width: 40px;
  }

  .form_box {
    width: 100%;
  }
}

@media (max-width: 399px) {
  /* form */
  .form_title {
    width: 80%;
  }

  input[type="text"],
  input[type="tel"],
  input[type="email"],
  input[type="date"],
  textarea {
    margin-left: 1rem;
  }
}