.container3{
  
  margin: 0 auto;
 
  max-width: 1400px;
    margin: 217px  auto;
 
   
}
.container2{
  
  margin: 0 auto;
 
  max-width: 1400px;
    margin: 70px auto;
 
   
}

/* 头部区域样式 */
.header3 {
  display: flex;
  flex-direction: column;
  margin-bottom: 20px;
}

@media (min-width: 768px) {
  .header3 {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
  
/*  .header-left {
    width: 50%;
    padding-left: 22px;
  }*/
  
  .header-right {
    width: 50%;
  }
}

h1 {
  font-size: 50px;
  font-weight: bold;
  margin-bottom: 1rem;
  color: #000;
}

.subtitle {
  color: #fff;
  margin-bottom: 1.5rem;
}

/* 选项卡样式 */
.tabs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
}

@media (min-width: 768px) {
  .tabs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .tabs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tab-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #ABABAB;
  color: white;
  border: none;
  border-radius: 0.75rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 28px;
  transition: all 0.3s ease;
  text-align: left;
  letter-spacing: 2px;
  padding-left: 44px;
}

.tab-button:hover {
  background-color: #999999;
}

.tab-button.active {
  background-color: #ff6f28;
}

.arrow {
  font-size: 0.75rem;
}

.divider {
  border: none;
  border-top: 2px solid #999999;
  margin: 1.5rem 0 2.5rem 0;
  width: 100%;
}

/* 内容布局 */
.content-wrapper {
  display: flex;
  flex-direction: column;
  gap: 2rem;
       
}

@media (min-width: 768px) {
  .content-wrapper {
    flex-direction: row;
       height: 452px;
       padding-top: 22px;
  }
  
  .image-section {
    width: 50%;
  }
  
  .content-section {
    width: 50%;
    padding: 8px 0px 0 50px;
  }
}

/* 图片部分 */

.image-placeholder {

  border-radius: 4px;
  overflow: hidden;
  position: relative;
  aspect-ratio: 1 / 1;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  display: none;
}

.project-image.show {
  opacity: 1;
  display: block;
  
  height: 435px;
}

/* 内容部分 */
.section-title {
  font-size: 45px;
  font-weight: bold;
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 4px solid #000;
  position: relative;
  letter-spacing: 3px;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -4px;
  right: 0;
  width: 75%;
  height: 4px;
  background-color: #eee;
}

.project-description {
  display: none;
  margin-bottom: 2rem;
  transition: all 0.3s ease;
}

.project-description.show {
  display: block;
}

.project-description p {
  color: #555;
  margin-bottom: 3.5rem;
}

.details-button {
  display: inline-block;
  background-color: #FF7E1C;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.3s ease;
      font-size: 21px;
      letter-spacing: 2px;
}

.details-button:hover {
  background-color: #ff6f28;
}