body {
  margin: 0;
  font-family: "Helvetica Neue", sans-serif;
  background-color: #f5f5f5;
  color: #333;
}

#wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

/* ロゴを右上に配置（スクロールで流れる） */
#logo-container {
  text-align: right;
  margin-bottom: 10px;
}

#logo-container img {
  width: 180px;
  height: 80px;
  object-fit: contain;
}

header h2 span {
  font-size: 1.5em;
  border-bottom: 2px solid #333;
  display: inline-block;
  margin-bottom: 10px;
}

.inner {
  background-color: #fff;
  padding: 20px;
  border-radius: 8px;
}

.notice-box {
  border: 1px solid #ddd;
  padding: 20px;
  margin-bottom: 30px;
  border-radius: 6px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.bold-date {
  font-weight: bold;
  font-size: 1.1em;
  color: #444;
}

.bold-text {
  font-weight: bold;
  margin-top: 10px;
  font-size: 1.2em;
}

.different-font {
  font-size: 1em;
  line-height: 1.6;
  margin-top: 10px;
}

.back-to-top {
  text-align: center;
  margin-top: 40px;
  margin-bottom: 60px;
}

.back-to-top a {
  display: inline-block;
  padding: 10px 20px;
  background-color: #f5f5f5;
  color: #333;
  text-decoration: none;
  border-radius: 4px;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.back-to-top a:hover {
  background-color: #e0e0e0;
}

footer {
  text-align: center;
  font-size: 0.9em;
  padding: 20px;
  color: #666;
}

/* スマホ対応 */
@media screen and (max-width: 600px) {
  .inner {
    padding: 15px;
  }

  header h2 span {
    font-size: 1.3em;
  }

  .bold-text {
    font-size: 1.1em;
  }

  .different-font {
    font-size: 0.95em;
  }

  #logo-container {
    text-align: center;
    margin-bottom: 15px;
  }

  #logo-container img {
    width: 140px;
    height: auto;
  }
}