/* ベーススタイル */
body {
  background-color: white;
  color: #0d482c;
  font-family: Arial, sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #66dc57;
  padding: 20px;
  color: white;
}

header #logo {
  width: 100px;
}

header #login-btn {
  color: white;
  text-decoration: none;
}

main #content {
  margin: 20px;
}

.main-section {
  border: 1px solid #66dc57;
  padding: 10px 20px;
  margin-bottom: 20px;
}

.main-section img {
  width: 100%;
  margin-bottom: 20px;
}

.main-section h3 {
  position: relative;
  margin-top: 0.2em;
}

.main-section h3::after {
  content: '';
  position: absolute;
  width: 60%;
  height: 1px;
  background-color: black;
  bottom: 0;
  left: 0;
}

.infomationSec {
  padding-bottom: 10px;
}

.start-button {
  display: block;
  background-color: #66dc57;
  color: white;
  margin: 20px auto;
  padding: 15px 30px;
  text-decoration: none;
  text-align: center;
  border-radius: 5px;
}

footer {
  text-align: center;
  padding: 20px;
  border-top: 2px solid #66dc57;
}

.headerText {
  display: block;
  font-size: 1.5em;
  margin-block-start: 0.3em;
  margin-block-end: 0.3em;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  font-weight: bold;
  unicode-bidi: isolate;
}

a {
  color: #0d482c;
  text-decoration: none;
}

a:visited {
  color: #0d482c;
}

a:hover {
  color: #0b7644;
}

a:active {
  color: #0b7644;
}

.smDate {
  font-size: small;
  margin-left: 1em;
}

/* メディアクエリでレスポンシブ対応 */
@media screen and (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }

  header #logo {
    width: 80px;
  }

  main #content {
    margin: 10px;
  }

  .main-section {
    padding: 10px;
  }

  .start-button {
    padding: 10px 20px;
    font-size: 0.9em;
  }
}

@media screen and (max-width: 480px) {
  .headerText {
    font-size: 1.2em;
  }

  header {
    padding: 10px;
  }

  header #login-btn {
    font-size: 0.9em;
  }

  .main-section {
    padding: 5px;
    margin-bottom: 15px;
  }

  .start-button {
    padding: 8px 15px;
    font-size: 0.8em;
  }

  footer {
    font-size: 0.8em;
  }
}

.login_page_Button {
  background-color: #00BFFF;
  color: white;
  padding: 10px 40px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  margin-left:auto;
  margin-right: auto;
}