* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'メイリオ', 'Hiragino Sans', sans-serif;
  background: #f5f0eb;
  color: #333;
  line-height: 1.85;
  padding: 20px;
}
.container {
  max-width: 780px;
  margin: 0 auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  padding: 40px 36px;
}
h1 {
  font-size: 22px;
  color: #c0392b;
  border-bottom: 3px solid #c0392b;
  padding-bottom: 10px;
  margin-bottom: 8px;
}
.source {
  font-size: 12px;
  color: #888;
  margin-bottom: 30px;
}
.source a { color: #888; }
.intro {
  background: #fdf2e9;
  border-left: 5px solid #e67e22;
  padding: 16px 20px;
  border-radius: 0 10px 10px 0;
  margin-bottom: 30px;
  font-size: 15px;
}
h2 {
  font-size: 18px;
  color: #2c3e50;
  margin-top: 36px;
  margin-bottom: 12px;
  padding-left: 14px;
  border-left: 5px solid #3498db;
}
h3 {
  font-size: 15px;
  color: #555;
  margin-top: 20px;
  margin-bottom: 8px;
}
p { margin-bottom: 14px; font-size: 15px; }
ul {
  margin: 8px 0 16px 24px;
  font-size: 15px;
}
li { margin-bottom: 6px; }
.tip {
  background: #eaf6ff;
  border: 1px solid #aed6f1;
  border-radius: 10px;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 14px;
}
.tip::before {
  content: "ポイント";
  display: inline-block;
  background: #3498db;
  color: #fff;
  font-size: 12px;
  font-weight: bold;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 6px;
  margin-right: 6px;
}
.example {
  background: #f0faf0;
  border: 1px solid #a9dfbf;
  border-radius: 10px;
  padding: 14px 18px;
  margin: 12px 0;
  font-size: 14px;
}
.example::before {
  content: "例";
  display: inline-block;
  background: #27ae60;
  color: #fff;
  font-size: 12px;
  font-weight: bold;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 6px;
  margin-right: 6px;
}
.warn {
  background: #fef9e7;
  border: 1px solid #f9e79f;
  border-radius: 10px;
  padding: 14px 18px;
  margin: 12px 0;
  font-size: 14px;
}
.warn::before {
  content: "注意";
  display: inline-block;
  background: #f39c12;
  color: #fff;
  font-size: 12px;
  font-weight: bold;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 6px;
  margin-right: 6px;
}
.section-num {
  display: inline-block;
  background: #3498db;
  color: #fff;
  width: 28px; height: 28px;
  text-align: center;
  line-height: 28px;
  border-radius: 50%;
  font-size: 14px;
  font-weight: bold;
  margin-right: 8px;
}
.factor-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 12px 0 20px 0;
}
.factor-item {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid #e0e0e0;
}
.usecase {
  background: #f4ecf7;
  border-radius: 12px;
  padding: 18px 20px;
  margin: 12px 0;
}
.usecase h3 {
  color: #7d3c98;
  margin-top: 0;
}
footer {
  text-align: center;
  margin-top: 36px;
  padding-top: 16px;
  border-top: 1px solid #ddd;
  font-size: 12px;
  color: #999;
}

/* ナビゲーション */
.site-nav {
  background: #2c3e50;
  border-radius: 12px;
  padding: 14px 20px;
  margin-bottom: 32px;
}
.site-nav .nav-title {
  color: #ecf0f1;
  font-size: 13px;
  font-weight: bold;
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.site-nav ul li { margin: 0; }
.site-nav ul li a {
  display: inline-block;
  background: #3d5166;
  color: #ecf0f1;
  text-decoration: none;
  font-size: 13px;
  padding: 4px 12px;
  border-radius: 20px;
  transition: background 0.2s;
}
.site-nav ul li a:hover {
  background: #3498db;
}
.site-nav ul li a.active {
  background: #e74c3c;
}

/* ページカード（トップページ用） */
.page-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 20px 0 30px 0;
}
.page-card {
  background: #f8f9fa;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  padding: 18px 16px;
  text-decoration: none;
  color: #333;
  display: block;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.page-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  border-color: #3498db;
}
.page-card .card-num {
  display: inline-block;
  background: #3498db;
  color: #fff;
  font-size: 11px;
  font-weight: bold;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
}
.page-card .card-title {
  font-size: 15px;
  font-weight: bold;
  color: #2c3e50;
  margin-bottom: 6px;
}
.page-card .card-desc {
  font-size: 13px;
  color: #666;
  line-height: 1.6;
}

/* ステップ */
.step-list {
  counter-reset: step-counter;
  list-style: none;
  margin: 12px 0 20px 0;
  padding: 0;
}
.step-list li {
  counter-increment: step-counter;
  position: relative;
  padding: 14px 16px 14px 52px;
  background: #f8f9fa;
  border-radius: 10px;
  margin-bottom: 10px;
  border: 1px solid #e8e8e8;
  font-size: 15px;
}
.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: #3498db;
  color: #fff;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: bold;
}

/* プロジェクトカード */
.project-card {
  border: 2px solid #3498db;
  border-radius: 12px;
  padding: 18px 20px;
  margin: 14px 0;
  background: #f0f8ff;
}
.project-card h3 {
  color: #2980b9;
  margin-top: 0;
  font-size: 16px;
}
.project-card .tag {
  display: inline-block;
  background: #2980b9;
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 4px;
  margin-bottom: 8px;
}

/* フォルダ構成 */
.folder-tree {
  background: #1e1e1e;
  color: #d4d4d4;
  border-radius: 10px;
  padding: 16px 20px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.8;
  margin: 12px 0;
  overflow-x: auto;
}
.folder-tree .folder { color: #569cd6; }
.folder-tree .file { color: #9cdcfe; }
.folder-tree .comment { color: #6a9955; }

/* コードブロック */
.code-block {
  background: #1e1e1e;
  color: #d4d4d4;
  border-radius: 10px;
  padding: 14px 18px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.7;
  margin: 12px 0;
  overflow-x: auto;
}

@media (max-width: 600px) {
  .page-cards { grid-template-columns: 1fr; }
  .factor-list { grid-template-columns: 1fr; }
  .container { padding: 24px 18px; }
}