* {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: sans-serif;
      background-color: rgb(255, 219, 76);
    }

    .container {
      display: flex;
      min-height: 100vh;
      flex-direction: column;

    }

    header {
      width: 100%;
      padding: 5px;
      background-color: #ffffff;
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: relative;

    }

    .content {
      display: flex;
      flex: 1;
    }

    .sidebar {
      max-width: 100%;
      background: #ffffff;
      padding: 20px;
      border-radius: 30px 30px 0 0;
      border: solid 1px #000000;
    }

.logo {
  text-align: center;
  background-color: #ffffff;

}

.logo img {
  width: 200px;
  height: auto;
  display: inline-block; /* 中央寄せには inline-block が必要 */
  padding: 5px;
}


    .menu a {
      display: block;
      margin: 10px 0;
      padding: 10px;
      text-decoration: none;
      color: #333;
      
    }

    .bar a {
border: solid 1px #000000;

  background-color: #ffffff;


    }

    .menu a:hover {
      text-decoration: underline;
    }

    .main {
      flex: 1;
      margin: 10px 10px 0;
      padding: 20px;
      border-radius: 30px 30px 0 0 ;
      background-color: rgb(255, 255, 255);
      border: solid 1px #000000;

    }

    .footer {
      text-align: center;
      padding: 20px;
      background: rgb(255, 219, 76);
      font-size: 14px;
    }

    .hamburger {
      display: none;
      font-size: 28px;
      background: transparent;
      border: none;
      cursor: pointer;
      position: fixed;
      top: 20px;
      right: 20px;
      z-index: 2100;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: rgb(255, 219, 76);
      backdrop-filter: blur(4px);
      animation: fadeIn 0.4s ease;
      z-index: 2000;
      padding: 60px 20px 20px;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 24px;
      margin: 15px 0;
      color: #333;
      text-decoration: none;
    }

    .mobile-menu a:hover {
      text-decoration: underline;
    }

    .close-btn {
      position: absolute;
      top: 20px;
      right: 20px;
      font-size: 30px;
      cursor: pointer;
    }

    @keyframes fadeIn {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }



    @media (max-width: 768px) {
      .content {
        flex-direction: column;
      }

      .sidebar {
        display: none;
      }

      .hamburger {
        display: block;
      }
    }

    @media (min-width: 769px) {
      .hamburger,
      .mobile-menu {
        display: none !important;
      }
    }

    @media (min-width: 769px) {
  header {
    display: none !important;
  }
}
@media (min-width: 769px) {
  .container {
    max-width: 80%;
    margin: 0 auto;
  }
}