body {
  font-family: sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #fff;
}
.last-modified {
  position: fixed;
  top: 10px;
  right: 15px;
  font-size: 0.9rem;
  color: #444;
  background: #f0f0f0;
  padding: 4px 8px;
  border-radius: 4px;
  box-shadow: 0 0 4px rgba(0,0,0,0.2);
}
.page-container {
  width: 90%;
  max-width: 1000px;
  margin: auto;
  padding: 1rem 0;
}

/* ヘッダー */
.product-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  width: 48px;
  height: 48px;
}

.product-title h1 {
  margin: 0;
  font-size: 2rem;
}

.subtitle {
  font-size: 1rem;
}

.update-date {
  margin-left: 1rem;
  color: #444;
}

/* ナビ */
.nav-links a {
  margin-right: 1rem;
  text-decoration: none;
  color: #006;
}

/* 直販案内 */
.direct-sale {
  margin: 1rem 0;
  font-size: 1.2rem;
}

/* 写真 + 添付品 */
.product-info {
  display: flex;
  gap: 2rem;
  margin: 1rem 0;
}

.product-photo {
  max-width: 100%;
}

.size-info {
  margin-top: 0.5rem;
}

.highlight {
  color: red;
  font-weight: bold;
}

/* 概要リスト */
.concept-list,
.sound-list,
.analog-list {
  margin-left: 1.2rem;
}

.sound-note {
  margin-left: 1.2rem;
  font-size: 0.9rem;
  color: #444;
}

/* DCC 運転方法 */
.operation-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.operation-steps li {
  margin-bottom: 0.6rem;
}

.operation-note {
  background: #f5f5f5;
  padding: 1rem;
}

/* 実装 */
.install-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.install-photo {
  width: 60%;
}

.install-text {
  padding: 0.5rem 1rem;
}

/* 仕様表 */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.spec-table th {
  background: #e5e5e5;
  border: 1px solid #999;
  padding: 0.5rem;
}

.spec-table td {
  border: 1px solid #999;
  padding: 0.5rem;
}