body {
  margin: 0;
  padding: 0;
  background: #fff;
  font-family: 'Helvetica Neue', sans-serif;
  text-align: center;
  color: #000;
}

.wrapper {
  padding: 20px;
}

.main-visual {
  width: 100%;
  max-width:960px;
  height: auto;
}

.btn-area {
  margin-top: 30px;
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 20px 30px;
  background: linear-gradient(to bottom, #666, #333);
  color: #fff;
  font-size: 18px;
  text-decoration: none;
  border-radius: 6px;
  min-width: 120px;
  transition: 0.3s;
}

.btn span {
  display: block;
  font-size: 12px;
  margin-top: 5px;
}

.btn:hover {
  background: linear-gradient(to bottom, #999, #444);
}

.notice {
  margin-top: 30px;
  font-size: 14px;
  color: #222;
  line-height: 1.6;
}

@media (max-width: 600px) {
  .btn-area {
    flex-direction: column;
    gap: 20px;
  }

  .btn {
    width: 80%;
    margin: 0 auto;
  }
}


.site-header {
  width: 100%;
  background: #555;
  color: #fff;
  text-align: center;
  font-size: 18px;
  padding: 12px 0;
  font-weight: bold;
  position: sticky;
  top: 0;
  z-index: 100;
}


.link-banners {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.link-banners a {
  display: inline-block;
}