* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    background: #050505;
    color: white;
    font-family: Arial, sans-serif;
  }
  
  .header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.85);
    z-index: 10;
  }
  
  .logo {
    font-weight: bold;
    letter-spacing: 2px;
  }
  
  nav a {
    color: white;
    text-decoration: none;
    margin-left: 25px;
    font-size: 14px;
    letter-spacing: 2px;
  }
  
  nav a:hover {
    color: #aaa;
  }
  
  .hero{
    height:100vh;
  
    background:
      linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.8)),
      url("images/K3tsulogo.png");
  
    background-size:120%;
    background-repeat:no-repeat;
    background-position:center 30%;
  
    display:flex;
    justify-content:center;
    align-items:center;
  
    text-align:center;
  
    padding:20px;
  }
  
  .hero h1 {
    font-size: 64px;
    margin: 0;
    letter-spacing: 5px;
  }
  
  .hero p {
    font-size: 18px;
    letter-spacing: 3px;
  }
  
  .btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 28px;
    border: 1px solid white;
    color: white;
    text-decoration: none;
    letter-spacing: 2px;
  }
  
  .btn:hover {
    background: white;
    color: black;
  }
  
  .section {
    max-width: 900px;
    margin: 0 auto;
    padding: 80px 20px;
    text-align: center;
  }
  
  .section h2,
  .page-title h1 {
    font-size: 36px;
    letter-spacing: 4px;
  }
  
  .section p {
    line-height: 1.8;
  }
  
  .video-box {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
  }
  
  .video-box iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
  }
  
  .news-list {
    display: grid;
    gap: 20px;
  }
  
  .news-card {
    border: 1px solid #333;
    padding: 20px;
    text-align: left;
  }
  
  .date {
    color: #aaa;
    font-size: 14px;
  }
  
  .page-title {
    padding: 140px 20px 60px;
    text-align: center;
  }
  
  .member-grid {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px 100px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
  
  .member-card {
    color: white;
    text-decoration: none;
    text-align: center;
    overflow: hidden;
  }
  
  .member-card img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    filter: grayscale(100%);
    transition: 0.4s;
  }
  
  .member-card:hover img {
    filter: grayscale(0%);
    transform: scale(1.04);
  }
  
  .member-card h2 {
    letter-spacing: 3px;
  }
  
  .profile-section {
    min-height: 100vh;
    padding: 130px 40px 60px;
    display: flex;
    gap: 50px;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
  }
  
  .profile-img {
    width: 45%;
    max-height: 650px;
    object-fit: cover;
  }
  
  .profile-text {
    flex: 1;
  }
  
  .profile-text h1 {
    font-size: 56px;
    letter-spacing: 5px;
  }
  
  .role {
    color: #aaa;
    letter-spacing: 2px;
  }
  
  footer {
    text-align: center;
    padding: 30px;
    color: #777;
    border-top: 1px solid #222;
  }
  
  @media (max-width: 700px) {
    .header {
      padding: 15px 20px;
    }
  
    nav a {
      margin-left: 15px;
      font-size: 12px;
    }
  
    .hero h1 {
      font-size: 42px;
    }
  
    .member-grid {
      grid-template-columns: 1fr;
    }
  
    .profile-section {
      flex-direction: column;
      text-align: center;
      padding: 120px 20px 50px;
    }
  
    .profile-img {
      width: 100%;
    }
  
    .profile-text h1 {
      font-size: 42px;
    }
  }

  .insta-link{
    color:white;
    font-size:30px;
  }

  .profile-section{
    min-height:100vh;
    padding:130px 40px 60px;
    display:flex;
    gap:50px;
    align-items:center;
    max-width:1000px;
    margin:0 auto;
  }
  
  .profile-image{
    flex:1;
  }
  
  .profile-image img{
    width:100%;
    aspect-ratio:3 / 4;
    object-fit:cover;
  }
  
  .profile-text{
    flex:1;
  }
  
  .profile-role{
    color:#aaa;
    letter-spacing:2px;
    margin-bottom:20px;
  }
  
  .profile-description{
    line-height:2;
    font-size:18px;
    margin-bottom:30px;
  }
  
  .profile-sns a{
    color:white;
    font-size:35px;
    display:inline-block;
    transition:0.3s;
  }
  
  .profile-sns a:hover{
    opacity:0.6;
    transform:scale(1.1);
  }

  .member-page-title{
    color: aliceblue;
    padding:70px 20px 60px;
  }

  .video-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  
    max-width: 1100px;
    margin: 40px auto 0;
  }
  
  .video-card {
    background: #111;
    padding: 15px;
    border-radius: 12px;
  }
  
  .video-card iframe {
    width: 100%;
    height: 300px;
  
    border: none;
    border-radius: 8px;
  }
  .video-card h3 {
    margin-top: 15px;
    font-size: 18px;
  }
  
  /* スマホでは1列にする */
  @media (max-width: 768px) {
    .video-list {
      grid-template-columns: 1fr;
    }
  }