.seo_block {
  width: 1200px;
  max-width: 96%;
  margin: 35px auto;
  color: #333;
  font-family: "Microsoft YaHei", Arial, sans-serif;
}

.seo_block h1,
.seo_block h2,
.seo_block h3 {
  margin: 0;
  font-weight: 700;
}

.seo_block h1 {
  font-size: 30px;
  line-height: 1.45;
  color: #143f7d;
}

.seo_block h2 {
  font-size: 26px;
  color: #143f7d;
  padding-bottom: 12px;
  border-bottom: 1px solid #e5e9f2;
}

.seo_block p {
  margin: 12px 0 0;
  line-height: 1.9;
  font-size: 16px;
}

.seo_grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.seo_card {
  min-height: 148px;
  padding: 22px;
  border: 1px solid #e5e9f2;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(20, 63, 125, 0.06);
}

.seo_card h3 {
  font-size: 19px;
  color: #1f5fac;
}

.seo_credentials {
  margin-top: 18px;
  padding: 18px 22px;
  border: 1px solid #d7e7fb;
  border-left: 4px solid #1f75d6;
  border-radius: 6px;
  background: #f5f9ff;
  color: #203040;
  font-size: 16px;
  line-height: 1.9;
  text-align: left;
}

.seo_credentials strong {
  color: #143f7d;
  font-size: 16px;
}

.seo_step {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.seo_step div {
  padding: 18px 14px;
  border-radius: 6px;
  color: #fff;
  background: #1f5fac;
  line-height: 1.65;
  text-align: center;
}

.seo_faq {
  margin-top: 20px;
}

.seo_faq details {
  padding: 16px 0;
  border-bottom: 1px solid #e5e9f2;
}

.seo_faq summary {
  cursor: pointer;
  color: #143f7d;
  font-size: 17px;
  font-weight: 700;
}

.seo_cta {
  margin-top: 24px;
  padding: 24px;
  border-radius: 6px;
  color: #fff;
  background: linear-gradient(90deg, #143f7d, #1f75d6);
}

.seo_cta a {
  display: inline-block;
  margin-top: 14px;
  padding: 10px 22px;
  border-radius: 4px;
  color: #143f7d;
  background: #fff;
  font-weight: 700;
  text-decoration: none;
}

@media (max-width: 900px) {
  .seo_grid,
  .seo_step {
    grid-template-columns: 1fr;
  }

  .seo_block h1 {
    font-size: 24px;
  }

  .seo_block h2 {
    font-size: 22px;
  }
}