@media (max-width: 48em) {
  html,
  body {
    width: 100%;
    min-width: 0;
    overflow-x: hidden;
  }

  body {
    font-size: 1.6rem;
    line-height: 1.75;
  }

  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  #blog_name {
    width: 100%;
    overflow: hidden;
  }

  #blog_name .background {
    display: block;
    width: 100%;
    min-width: 100%;
    height: auto;
  }

  #blog_name #site-name {
    top: 50%;
    left: clamp(6.1rem, 16vw, 7.8rem);
    margin: 0;
    font-size: clamp(1.9rem, 5.3vw, 2.7rem);
    line-height: 1;
    white-space: nowrap;
    transform: translateY(-50%);
  }

  #blog_name > a:not(#site-name) {
    top: 50%;
    left: 1rem;
    display: block;
    width: clamp(4.4rem, 12vw, 5.8rem);
    height: clamp(4.4rem, 12vw, 5.8rem);
    margin: 0;
    transform: translateY(-50%);
  }

  #blog_name .first-logo {
    position: static;
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
  }

  .light-section {
    display: flex;
    right: 0.3rem;
    width: clamp(2.5rem, 7vw, 3.5rem);
  }

  .light-state-text {
    font-size: clamp(0.6rem, 1.6vw, 0.8rem);
  }

  .main-box {
    display: flex;
    width: 100%;
    flex-direction: column;
  }

  #nav {
    position: relative;
    top: auto;
    width: 100% !important;
    height: auto;
    margin: 1.2rem 0 0;
    padding: 0 1.2rem;
  }

  #nav .social-btns {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.8rem;
    width: 100%;
    height: auto;
    min-height: 0;
  }

  #nav .social-btns .btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-width: 0;
    min-height: 4.8rem;
    height: auto;
    margin: 0;
    padding: 0.7rem 0.4rem;
    border-radius: 0.9rem;
  }

  #nav .social-btns .btn .fa {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    right: auto;
    bottom: auto;
    width: 100%;
    max-height: none;
    font-size: clamp(1.45rem, 4vw, 1.8rem);
    line-height: 1.25;
    white-space: nowrap;
    transform: none;
  }

  #nav .social-btns .btn .fa::before {
    display: none;
  }

  #nav .social-btns .btn.active .fa,
  #nav .social-btns .btn:focus .fa,
  #nav .social-btns .btn:hover .fa {
    transform: none;
  }

  #page_index_main {
    width: calc(100% - 2.4rem) !important;
    height: auto !important;
    min-height: 0;
    margin: 2rem 1.2rem 3.2rem !important;
  }

  #page_index_main .page {
    width: 100%;
    height: auto !important;
    min-height: 0;
    margin: 0;
    float: none;
  }

  #markdown-content {
    height: auto;
    padding: 0 0.4rem 2.4rem !important;
    font-size: 1.6rem;
    line-height: 1.8;
    overflow-wrap: anywhere;
  }

  #markdown-content h1 {
    font-size: 2.8rem;
    line-height: 1.3;
  }

  #markdown-content h2 {
    font-size: 2.3rem;
    line-height: 1.4;
  }

  #markdown-content h3 {
    font-size: 2rem;
    line-height: 1.4;
  }

  #markdown-content p,
  #markdown-content li {
    font-size: 1.6rem;
    line-height: 1.8;
  }

  #markdown-content ul,
  #markdown-content ol {
    padding-left: 2.2rem;
  }

  #markdown-content a,
  .link {
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  #page_index_main > .page > img {
    display: block;
    width: 100%;
    height: auto;
    margin: 0 auto 2.8rem !important;
  }

  #page_index_main > .page > h2 {
    margin: 0 0 1.6rem;
    padding: 0 0.4rem;
    font-size: 2.4rem !important;
    line-height: 1.4;
  }

  .teacher-Info {
    margin-bottom: 0;
  }

  .introduct-teacher {
    padding: 0 0.4rem !important;
    font-size: 1.6rem;
    line-height: 1.8;
    overflow-wrap: anywhere;
  }

  .teacher-image-float {
    float: none;
    width: clamp(14rem, 44vw, 18rem);
    max-width: 55%;
    height: auto;
    margin: 0 auto 1.8rem;
  }

  .team-section {
    margin-bottom: 3.2rem;
  }

  .team-section h2 {
    margin: 0 0 1.6rem;
    padding: 0;
    font-size: clamp(2.4rem, 7vw, 3rem);
    line-height: 1.3;
    text-align: center;
  }

  .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem 1rem;
    width: 100%;
  }

  .li-t {
    border-radius: 0.7rem;
  }

  .li-t:hover {
    transform: none;
  }

  .li-Intro {
    min-height: 5.8rem;
    padding: 0.7rem 0.4rem;
    font-size: 1.45rem;
  }

  body .grid-container {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  body .div-gallery-item-container {
    min-height: 0;
    margin: 0;
    box-shadow: 0 0.3rem 1rem rgba(0, 0, 0, 0.12);
  }

  .link {
    display: inline;
    margin: 0;
    font-size: 1.6rem !important;
    line-height: 1.8;
  }

  #git_link {
    word-break: break-all;
  }

  .map {
    left: 0 !important;
    top: 0 !important;
    margin-top: 2rem;
  }

  #map_container {
    width: 100% !important;
    height: clamp(32rem, 50vh, 46rem) !important;
  }

  body .friend-links-wrap {
    gap: 1.8rem;
    margin: 1.2rem 0 3rem;
  }

  body .friend-links-col,
  body .friend-links-col:first-child {
    gap: 0.6rem;
    padding-left: 0;
  }

  body .friend-links-col a {
    padding: 0.35rem 0;
    font-size: 1.5rem;
    line-height: 1.6;
  }

  #page_footer {
    float: none;
    width: 100%;
    background: #303943;
    font-size: 1.3rem;
    line-height: 1.7;
  }

  #page_footer img {
    display: block;
    width: 100%;
    height: 7.2rem;
    object-fit: cover;
    bottom: auto;
  }

  #page_footer > div {
    position: static !important;
    width: 100% !important;
    height: auto !important;
    padding: 1.2rem 1.6rem 1.5rem;
    font-size: 1.3rem !important;
    overflow-wrap: anywhere;
  }

  .nav-wrap {
    right: 0.8rem;
    bottom: 2rem;
  }

  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      scroll-behavior: auto !important;
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }
}

@media (max-width: 21em) {
  #nav .social-btns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .team-grid {
    grid-template-columns: 1fr;
  }
}