body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  background: #f6f9fc;
  color: #0f2b46;
}

.site-header {
  background: #0f2b46;
  padding: 12px;
  color: #fff;
}

.logo-text {
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
}

.case-wrapper {
  max-width: 1000px;
  margin: 40px auto;
  padding: 20px;
  background: #fff;
  border-radius: 16px;
}

.case-title {
  text-align: center;
  font-size: 28px;
  margin-bottom: 30px;
}

.case-image-wrap {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.case-image-box {
  width: 420px;
  text-align: center;
}

.case-image-box img {
  width: 100%;
  border-radius: 12px;
  border: 2px solid #ccc;
}

.case-spec {
  margin-top: 40px;
}

.case-spec table {
  width: 100%;
  border-collapse: collapse;
}

.case-spec th,
.case-spec td {
  border: 1px solid #ccc;
  padding: 10px;
}

.case-spec th {
  background: #e8f0ff;
  width: 30%;
}

.case-detail {
  margin-top: 40px;
  line-height: 1.8;
}

.case-btn-area {
  margin-top: 50px;
  display: flex;
  justify-content: center;
  gap: 20px;
}

.back-btn {
  background: #0f2b46;
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
}