body {
  margin: 0;
  font-family: "Yu Gothic", "Meiryo", sans-serif;
  background: #111;
  color: #eee;
  line-height: 1.7;
}

.site-header {
  padding: 40px 24px;
  background: #1b1b1b;
  border-bottom: 1px solid #333;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 32px;
}

.site-header p {
  margin: 0;
  color: #aaa;
}

.site-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px;
}

.site-title-link {
  color: #eee;
  text-decoration: none;
}

.site-title-link:hover {
  color: #8aa4ff;
}

.menu-section h2,
.content-section h2 {
  margin-top: 0;
  border-left: 4px solid #8aa4ff;
  padding-left: 12px;
}

.menu-list {
  display: grid;
  gap: 16px;
}

.menu-card {
  display: block;
  padding: 20px;
  background: #1c1c1c;
  border: 1px solid #333;
  border-radius: 10px;
  color: #eee;
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.menu-card:hover {
  transform: translateY(-2px);
  border-color: #8aa4ff;
}

.menu-title {
  display: block;
  font-size: 20px;
  font-weight: bold;
}

.menu-description {
  display: block;
  margin-top: 4px;
  color: #aaa;
}

.back-link {
  color: #8aa4ff;
}

.site-footer {
  padding: 24px;
  color: #777;
  text-align: center;
  border-top: 1px solid #333;
}

.include-header {
  min-height: 150px;
}

.include-footer {
  min-height: 80px;
}

/* 読み込み中も失敗時も、余計な文字を出さず場所だけ確保する */
.include-header.is-loading,
.include-header.is-error {
  min-height: 150px;
}

.include-footer.is-loading,
.include-footer.is-error {
  min-height: 80px;
}