.seo-case .articleWrap {
  padding: clamp(38px, 5vw, 76px) clamp(20px, 5.5vw, 82px);
}

.seo-case .articleDetail_head ul {
  margin-bottom: 18px;
}

.seo-case .articleDetail_head .articleTit {
  margin: 0;
  font-size: clamp(26px, 2.6vw, 38px);
  font-weight: 700;
  line-height: 1.35;
}

.seo-case .seo-case__lead {
  max-width: 900px;
  margin: 0 0 clamp(38px, 5vw, 62px);
  font-size: var(--font18);
  line-height: 2;
}

.seo-case .seo-case__section {
  margin-top: clamp(44px, 6vw, 80px);
  padding-top: clamp(36px, 5vw, 60px);
  border-top: 1px solid #dedede;
}

.seo-case .seo-case__section:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.seo-case .seo-case__section h2 {
  margin: 0 0 22px;
  color: var(--red);
  font-size: clamp(23px, 2.2vw, 32px);
  line-height: 1.45;
}

.seo-case .seo-case__section h3 {
  margin: 26px 0 10px;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.5;
}

.seo-case .seo-case__section p {
  line-height: 1.9;
}

.seo-case .seo-case__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 24px 0 0;
}

.seo-case .seo-case__list li {
  position: relative;
  padding-left: 18px;
  line-height: 1.75;
}

.seo-case .seo-case__list li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
}

.seo-case .seo-case__figure {
  margin: 30px auto 0;
}

.seo-case .seo-case__figure img {
  display: block;
  width: 100%;
  max-width: 900px;
  height: auto;
  margin: 0 auto;
  border: 1px solid #e2e2e2;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.seo-case .seo-case__figure figcaption {
  margin-top: 10px;
  color: #666;
  font-size: 14px;
  text-align: center;
}

.seo-case .seo-case__note {
  margin-top: 20px;
  padding: 20px 24px;
  border-left: 3px solid var(--red);
  background: #f5f5f5;
}

.seo-case .seo-case__cta {
  margin-top: clamp(44px, 6vw, 72px);
  padding: clamp(28px, 4vw, 46px);
  border-radius: 5px;
  background: #f5f5f5;
}

.seo-case .seo-case__cta h2 {
  margin-bottom: 12px;
}

.seo-case .seo-case__cta .btn02 {
  margin-top: 24px;
}

@media screen and (max-width: 767px) {
  .seo-case .seo-case__lead {
    font-size: var(--font16);
    line-height: 1.85;
  }

  .seo-case .seo-case__list {
    grid-template-columns: 1fr;
  }

  .seo-case .seo-case__section p {
    line-height: 1.8;
  }
}