body {
  background-color: #0b0231;
  margin: 0;
}

.page-center {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 8px;
  box-sizing: border-box;
  background-color: #ffffcc;
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

img{
  display: block;
  border: 0;
  max-width: 100%;
  height: auto;
  margin-left: auto;
  margin-right: auto;
}

/* ページ全体（Paris～Dakarのテーマカラー） */
.pd-page {
  background-color: #cc9933;
  border: 1px solid #000000;
  border-radius: 8px;
  padding: 16px;
  box-sizing: border-box;
}

.pd-header {
  text-align: center;
}

.pd-header img {
  display: block;
  margin: 8px auto;
}

.part-label {
  display: inline-block;
  padding: 6px 18px;
  background-color: #0000cc;
  color: #ffffff;
  font-weight: bold;
  font-size: 1.1em;
  border-radius: 6px;
  margin: 8px 0;
}

.pd-outro {
  text-align: center;
  color: #3b2412;
  font-weight: bold;
  margin: 8px 0 16px;
}

/* 記事ナビ */
.chapter-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 8px 12px;
  max-width: 820px;
  margin: 16px auto;
  padding: 12px;
  background-color: rgba(255, 255, 255, 0.35);
  border-radius: 8px;
}

.chapter-nav a {
  padding: 5px 12px;
  background-color: rgba(255, 255, 255, 0.85);
  border-radius: 8px;
  color: #1a1a2e;
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.chapter-nav a:hover,
.chapter-nav a:focus-visible {
  background-color: #ffffff;
  transform: scale(1.05);
}

.chapter-nav a.nav-link-last-clicked {
  background-color: rgba(90, 58, 122, 0.18);
  color: #5a3a7a;
}

/* 記事本文 */
.article-list {
  margin-top: 16px;
}

.container {
  max-width: 862px;
  margin: 0 auto 16px;
  padding: 12px 16px;
  background-color: #fff8e0;
  border-radius: 8px;
  box-sizing: border-box;
  overflow: hidden;
}

.container b {
  display: block;
  font-size: 1.3em;
  color: #0000cc;
  margin-bottom: 8px;
}

.container p {
  margin: 0.9em 0;
  line-height: 1.8;
  text-indent: 1em;
}

/* 右側「戻る」ボタン (back-to-header) */
.back-to-header {
  clear: both;
}