body {
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(120deg, #f2fbf9 0%, #f2fbf9 100%);
  display: flex;
  flex-direction: column;
  justify-content: start;
  align-items: center;
  min-height: 100vh;
  text-align: center;
}

.whole_wrapper {
  display: flex;
  flex-direction: column;
  /* justify-content: center; */
  align-items: center;
  min-height: 100vh;
}

h1 {
  font-size: 36px;
  color: #222;
  font-weight: 900;
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.2);
  margin: 10px 0 10px;
}

.entrance-link-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

.entrance-link {
  background: linear-gradient(120deg, #35993d 0%, #35993d 100%);
  color: #ffffff;
  text-align: center;
  padding: 12px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-size: 22px;
  font-weight: 500;
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.entrance-link:hover {
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.2);
  transform: translateY(-3px);
}

.explanation {
  font-size: 18px;
  color: #333;
  margin-top: 20px;
}

/* スマートフォン向けの調整 */
@media (max-width: 600px) {
  h1 {
    font-size: 27px;
  }

  h2 {
    font-size: 20px;
  }

  .register-link {
    padding: 15px 40px;
    font-size: 16px;
    width: -webkit-fill-available;
  }

  .menu-item {
    width: calc(100% - 30px);
    padding: 15px;
    margin: 0 15px 20px;
  }
}

/* ------------------------------------------------------------------------- */

.section {
  margin-bottom: 35px;
}

.menu-item {
  background-color: #ffffff;
  padding: 20px 10px;
  /* border-radius: 15px; */
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  margin: 0 20px 20px;
  width: calc(100% - 40px);
  max-width: 600px;
}

.menu-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

h2 {
  font-size: 22px;
  color: #444;
  margin-bottom: 20px;
  /* padding-bottom: 20px; */
  font-weight: 600;
}

.register-link-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 15px;
}

.register-link {
  background: linear-gradient(120deg, #35993d 0%, #35993d 100%);
  color: #ffffff;
  text-align: center;
  padding: 12px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.register-link:hover {
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.2);
  transform: translateY(-3px);
}

.button {
  display: inline-block;
  padding: 15px 25px;
  font-size: 18px;
  color: #ffffff;
  background: linear-gradient(120deg, #35993d 0%, #35993d 100%);
  border: none;
  border-radius: 5px;
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  /* background-color: #0056b3; */
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.2);
  transform: translateY(-3px);
}