/* PDRN 核心技术：次要技术卡片 + 主要证书板块 */
.science-grid {
  gap: 14px;
  border: 0;
}

.science-grid article,
.science-grid article:last-child {
  min-height: 210px;
  padding: 28px 30px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.025);
}

.science-grid h3 {
  margin: 30px 0 5px;
  font-size: 12px;
}

.science-grid h4 {
  margin-bottom: 16px;
  font-size: 22px;
}

.science-grid p {
  margin: 0;
  font-size: 12px;
  line-height: 1.75;
}

.certificate-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 62px;
}

.certificate-copy {
  grid-column: 1 / -1;
  max-width: 680px;
  padding: 0 0 8px;
}

.certificate-copy h3 {
  margin: 12px 0 10px;
  font-size: clamp(28px, 3vw, 38px);
}

.certificate-copy p {
  margin: 0;
}

.certificate-row > .placeholder,
.certificate-row > .certificate-image {
  min-width: 0;
  min-height: 360px;
  height: 360px;
}

.certificate-row > .placeholder {
  padding: 34px;
}

@media (max-width: 900px) {
  .science-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .science-grid article,
  .science-grid article:last-child {
    min-height: 190px;
    padding: 24px 20px;
  }

  .science-grid h3 {
    margin-top: 24px;
  }

  .science-grid h4 {
    font-size: 19px;
  }

  .science-grid p {
    font-size: 11px;
  }

  .certificate-row {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .certificate-copy {
    grid-column: auto;
    margin-bottom: 6px;
  }

  .certificate-row > .placeholder,
  .certificate-row > .certificate-image {
    width: 100%;
    height: auto;
    min-height: 360px;
  }

  .certificate-row > .certificate-image {
    aspect-ratio: 3 / 2;
  }
}

@media (max-width: 620px) {
  .science-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .science-grid article,
  .science-grid article:last-child {
    min-height: 0;
    padding: 24px;
  }

  .science-grid h3 {
    margin-top: 18px;
  }

  .certificate-row {
    gap: 20px;
    margin-top: 48px;
  }

  .certificate-row > .placeholder,
  .certificate-row > .certificate-image {
    min-height: 300px;
  }
}