body {
  background-color: #0b0231;
  color: #3b2412;
  margin: 0;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-left: auto;
  margin-right: auto;
}


.page-center {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 12px 72px;
  box-sizing: border-box;
  background-color: #ffffcc;
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.page-title {
  text-align: center;
  margin-bottom: 16px;
}

.page-title img {
  max-width: 100%;
  height: auto;
}

.illustration {
  text-align: center;
  margin: 20px 0;
}

.illustration img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.section-title {
  text-align: center;
  color: #0000cc;
}

p {
  line-height: 1.8;
  text-indent: 1em;
  margin: 14px 0;
}

.toc-columns {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 12px;
  margin: 24px 0;
}

.toc-columns .col {
  flex: 1 1 200px;
  text-align: center;
  padding: 12px;
  background-color: #e6ecff;
  border-radius: 8px;
  font-weight: bold;
  color: #0000cc;
}

.notice {
  text-align: center;
  font-size: 0.9em;
  color: #556;
  margin: 8px 0 32px;
}