/* Research Use
 * PC     — Figma 2:3 / 34:191 @1920；1rem = 100px
 * Tablet — Figma 62:2 @834；≤1025 时 1rem@750=100px → rem = px × 750/834/100
 * Mobile — Figma 62:14 @390；rem = px × 750/390/100
 */

.oc-main-sam-research-use {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.18rem;
  padding: 0.4rem 2.15rem 1rem;
}

.oc-main-sam-research-use h2 {
  width: 100%;
  color: #1d2633;
  text-align: center;
  font-weight: 700;
  margin: 0;
}

.oc-main-sam-research-use .research-use-card {
  display: flex;
  align-items: flex-start;
  gap: 0.28rem;
  width: 100%;
  box-sizing: border-box;
  background: #f3f9fd;
  padding: 0.24rem 0.5rem;
}

.oc-main-sam-research-use .research-use-img {
  flex: 0 0 2.52rem;
  width: 2.52rem;
  height: 2.52rem;
  overflow: hidden;
  background: #004a8c;
}

.oc-main-sam-research-use .research-use-img img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 主栏至少 = 图片高 + 按钮高，按钮顶对齐图片底 */
.oc-main-sam-research-use .research-use-main {
  flex: 1;
  min-width: 0;
  min-height: 2.92rem;
  display: flex;
  flex-direction: column;
  padding-top: 0.08rem;
}

.oc-main-sam-research-use .research-use-tag {
  color: #2f67b3;
  font-size: 0.14rem;
  font-weight: 700;
  line-height: normal;
  text-transform: uppercase;
}

.oc-main-sam-research-use .research-use-sub {
  margin-top: 0.15rem;
  color: #1d2633;
  font-size: 0.23rem;
  font-weight: 700;
  line-height: 0.3rem;
}

.oc-main-sam-research-use .research-use-desc {
  margin-top: 0.15rem;
  color: #808899;
  font-size: 0.16rem;
  font-weight: 400;
  line-height: normal;
}

.oc-main-sam-research-use .research-use-content {
  margin-top: 0.15rem;
  color: #565f6b;
  font-size: 0.16rem;
  font-weight: 400;
  line-height: 0.22rem;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  overflow: hidden;
}

.oc-main-sam-research-use .research-use-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-end;
  margin-top: auto;
  min-width: 1.9rem;
  height: 0.4rem;
  padding: 0 0.16rem;
  box-sizing: border-box;
  background: #2f67b3;
  border: 1px solid #2f67b3;
  color: #ffffff;
  font-size: 0.14rem;
  font-weight: 700;
  line-height: normal;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.oc-main-sam-research-use .research-use-btn:hover {
  background: #234d8a;
  border-color: #234d8a;
  color: #ffffff;
}

.oc-main-sam-research-use .research-use-btn:focus-visible {
  outline: 2px solid #1d2633;
  outline-offset: 2px;
}

@media screen and (max-width: 1400px) {
  .oc-main-sam-research-use {
    padding: 0.4rem 1.2rem;
  }
}

/* Tablet — Figma 62:2 @834 */
@media screen and (max-width: 1025px) {
  .oc-main-sam-research-use {
    gap: 0.162rem;
    padding: 0.288rem 0.288rem 0.36rem;
  }

  .oc-main-sam-research-use h2 {
    font-size: 0.252rem !important;
    line-height: normal;
  }

  .oc-main-sam-research-use .research-use-card {
    gap: 0.216rem;
    padding: 0.18rem;
  }

  .oc-main-sam-research-use .research-use-img {
    flex: 0 0 1.978rem;
    width: 1.978rem;
    height: 1.978rem;
  }

  .oc-main-sam-research-use .research-use-main {
    min-height: 2.266rem;
    padding-top: 0.036rem;
  }

  .oc-main-sam-research-use .research-use-tag {
    font-size: 0.099rem;
  }

  .oc-main-sam-research-use .research-use-sub {
    margin-top: 0.117rem;
    font-size: 0.171rem;
    line-height: 0.216rem;
  }

  .oc-main-sam-research-use .research-use-desc {
    margin-top: 0.126rem;
    font-size: 0.117rem;
  }

  .oc-main-sam-research-use .research-use-content {
    margin-top: 0.126rem;
    font-size: 0.117rem;
    line-height: 0.162rem;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    max-height: 0.486rem;
  }

  .oc-main-sam-research-use .research-use-btn {
    min-width: 1.439rem;
    height: 0.288rem;
    padding: 0 0.12rem;
    font-size: 0.108rem;
  }
}

/* Mobile — Figma 62:14 @390；content 固定 5 行 */
@media screen and (max-width: 750px) {
  .oc-main-sam-research-use {
    gap: 0.269rem;
    padding: 0.462rem 0.308rem 0.538rem;
  }

  .oc-main-sam-research-use h2 {
    font-size: 0.462rem !important;
    line-height: normal;
  }

  .oc-main-sam-research-use .research-use-card {
    display: grid;
    grid-template-columns: 2.154rem minmax(0, 1fr);
    column-gap: 0.308rem;
    row-gap: 0;
    align-items: start;
    padding: 0.308rem;
  }

  .oc-main-sam-research-use .research-use-img {
    grid-column: 1;
    grid-row: 1;
    flex: none;
    width: 2.154rem;
    height: 2.154rem;
  }

  .oc-main-sam-research-use .research-use-main {
    display: contents;
    min-height: 0;
    padding-top: 0;
  }

  .oc-main-sam-research-use .research-use-head {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
    padding-top: 0.038rem;
  }

  .oc-main-sam-research-use .research-use-tag {
    font-size: 0.173rem;
  }

  .oc-main-sam-research-use .research-use-sub {
    margin-top: 0.154rem;
    font-size: 0.269rem;
    line-height: 0.346rem;
  }

  .oc-main-sam-research-use .research-use-desc {
    grid-column: 1 / -1;
    grid-row: 2;
    margin-top: 0.231rem;
    font-size: 0.212rem;
    line-height: normal;
  }

  .oc-main-sam-research-use .research-use-content {
    grid-column: 1 / -1;
    grid-row: 3;
    margin-top: 0.212rem;
    font-size: 0.25rem;
    line-height: 0.346rem;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 5;
    line-clamp: 5;
    overflow: hidden;
    max-height: 1.73rem;
  }

  .oc-main-sam-research-use .research-use-btn {
    grid-column: 1 / -1;
    grid-row: 4;
    justify-self: end;
    align-self: end;
    margin-top: 0.096rem;
    min-width: 2.885rem;
    height: 0.692rem;
    padding: 0 0.2rem;
    font-size: 0.231rem;
  }
}