body {
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  background: #fff;
  overflow: hidden;
}

.container {
  width: 1920px;
  height: 1080px;
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform-origin: top center;
  transform: scale(var(--scale-ratio, 1));
  position: relative;
  margin-top: 20px;
}

.home-container::before{
  content: '';
  position: absolute;
  width: 30%;
  height: 200px;
  background: #f00;
  left: 5%;
  top: 10%;
  z-index: -1;
  background: url('images/background1.png') no-repeat center center;
}
.home-container::after {
  content: '';
  position: absolute;
  width: 30%;
  height: 200px;
  background: #f00;
  right: 0%;
  bottom: 10%;
  z-index: -1;
  background: url('images/background2.png') no-repeat center center;
}

.header {
  text-align: center;
  margin: 0px 0 40px;
}

.header h1 {
  font-size: 80px;
  font-weight: normal;
  margin-bottom: -5px;
}

.header .subtitle {
  font-size: 28px;
  font-weight: 200;
  font-family: "Helvetica Neue", Arial, sans-serif;
  padding: 10px 0 60px 0;
}

/* 移动端 subtitle 样式 */
@media screen and (max-width: 768px) {
  .header .subtitle {
    padding: 5px 0 10px 0 !important;
  }
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(4, 300px);
  grid-template-rows: repeat(3, auto);
  gap: 30px 20px;
  width: 1260px;
  margin-top: -60px;
}

.grid-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  overflow: visible;
  background: #fff;
  cursor: pointer;
  height: 160px;
  min-width: 300px;
}

.grid-image {
  width: auto;
  height: auto;
  position: relative;
}

/* 图片定位 */
.default-image,
.hover-image {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  transition: opacity 0.15s ease-out;
  backface-visibility: hidden;
  will-change: opacity;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* 初始状态 - 分开处理2.png和3.png/4.png */
.hover-image {
  opacity: 0;
  /* 移除visibility属性 */
}

.overlay-images {
  opacity: 0;
  visibility: hidden; /* 保持3.png/4.png的visibility效果 */
}

/* hover效果 - 只针对2.png */
.grid-item:hover:not(.active) .default-image {
  opacity: 0;
}

.grid-item:hover:not(.active) .hover-image {
  opacity: 1;
  /* 移除visibility属性 */
}

/* 其他图片保持原有过渡效果 */
.overlay-top,
.overlay-bottom {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transition: opacity 0.3s ease;
  transform-origin: center center;
}

/* 重叠图片的位置 */
.overlay-top {
  z-index: 2;
  top: 24px;
  transform: translateX(-50%);  /* 移除scale(1) */
}

.overlay-bottom {
  top: -80px;
  z-index: 1;
  transform: translateX(-50%);  /* 移除scale(1.2) */
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* 修改点击后的状态，确保2.png保留 */
.grid-item.active .default-image {
  opacity: 0;
}

.grid-item.active .hover-image {
  opacity: 1;
  visibility: visible;
}

.grid-item.active .overlay-images {
  opacity: 1;
  visibility: visible;
}

/* 点击3.png后的状态 */
.grid-item.show-second .overlay-images {
  opacity: 0;
  visibility: hidden;
}

/* 当父元素是active状态时，鼠标移到4.png上的效果 */
.grid-item.active .overlay-bottom:hover {
  transform: translateX(-50%) scale(1.1);  /* 恢复到原来的1.1倍 */
  cursor: pointer;
}

/* 不需要再次设置hover-image的状态，因为已经在active状态下显示了 */ 

/* 添加媒体查询 */
@media screen and (max-width: 1920px) {
  .grid-container {
    gap: 20px 15px;
  }

}
@media screen and (max-width: 1540px) {

  .home-container::before{
    left:0%;
    top: 7%;
  }
  .home-container::after {
    bottom: 10%;
  }
}
@media screen and (max-width: 1440px) {
  .grid-container {
    gap: 15px 10px;
  }
  .home-container::before{
    left:0%;
    top: 10%;
  }
  .home-container::after {
    bottom: 3%;
  }
}
@media screen and (max-width: 1340px) {
 
  .home-container::before{
    left:0%;
    top: 10%;
  }
  .home-container::after {
    bottom: 3%;
  }
}
@media screen and (max-width: 1240px) {
 
  .home-container::before{
    left:0%;
    top: 10%;
  }
  .home-container::after {
    bottom: 3%;
  }
}
@media screen and (max-width: 1140px) {
 
  .home-container::before{
    left:0%;
    top: 10%;
  }
  .home-container::after {
    bottom: 13%;
  }
}
/* 添加移动端覆盖样式 */
@media screen and (max-width: 768px) {
  .grid-container {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    grid-template-rows: auto !important;
    gap: 15px !important;
    width: 100% !important;
    max-width: 360px !important;
    height: auto !important;
    position: relative !important;
    left: auto !important;
    top: auto !important;
    transform: none !important;
    margin: 0 auto !important;
  }

  .grid-item {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 1/1 !important;
    min-width: unset !important;
    max-width: none !important;
    position: relative !important;
    transform: none !important;
  }
  .home-container::before{
    left:22%;
    top: 8%;
  }
}

/* 背景图片样式 */
.background-image1index img {
    /* width: 300px;  可以调整宽度 */
    /* height: auto; */
    position: absolute;
    top: 50px;     /* 可以调整上边距 */
    left: 50px;    /* 可以调整左边距 */
    z-index: -1;   /* 确保在导航下方 */
    opacity: 0.8;  /* 可以调整透明度 */
}
.background-image2index img{
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
}
.background-image2index img {
    /* width: 500px;  可以调整宽度 */
    /* height: auto; */
    position: absolute;
    bottom: 50px;  /* 可以调整下边距 */
    right: 50px;   /* 可以调整右边距 */
    z-index: -2;   /* 确保在最底层 */
    opacity: 0.8;  /* 可以调整透明度 */
}

/* 只在PC端显示背景图片 */
@media screen and (max-width: 768px) {
    .background-image1index,
    .background-image2index {
        display: none;
    }
}

/* Footer 样式 */
.site-footer {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    text-align: center;
    z-index: 10;
}

.footer-content {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 12px;
    color: #666;
}

.copyright {
    color: #333;
}

.footer-divider {
    color: #999;
}

.footer-link {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: #000;
    text-decoration: underline;
}

.pmark-logo {
    height: 30px;
    width: auto;
    vertical-align: middle;
}

.pmark-text {
    color: #333;
    font-size: 12px;
}

/* 移动端 footer 样式 */
@media screen and (max-width: 768px) {
    .site-footer {
        position: relative;
        bottom: auto;
        left: auto;
        transform: none;
        margin-top: 20px;
        padding: 15px 10px;
    }
    
    .footer-content {
        flex-wrap: wrap;
        gap: 5px;
        font-size: 10px;
    }
    
    .pmark-logo {
        height: 24px;
    }
}

/* Modal 样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
}

.modal-content {
    background-color: #fff;
    margin: 3% auto;
    padding: 0;
    border-radius: 8px;
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    position: relative;
}

.modal-close {
    position: absolute;
    right: 20px;
    top: 15px;
    color: #666;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1;
    transition: color 0.3s ease;
}

.modal-close:hover,
.modal-close:focus {
    color: #000;
}

.modal-body {
    padding: 40px 50px;
    overflow-y: auto;
    max-height: calc(85vh - 80px);
    line-height: 1.8;
}

.modal-body h2 {
    color: #333;
    font-size: 24px;
    font-weight: bold;
}

.modal-body h3 {
    color: #333;
    font-size: 18px;
    font-weight: bold;
    margin-top: 20px;
    margin-bottom: 10px;
}

.modal-body p {
    color: #333;
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.8;
}

/* 移动端 modal 样式 */
@media screen and (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 5% auto;
        max-height: 90vh;
    }
    
    .modal-body {
        padding: 30px 20px;
        max-height: calc(90vh - 60px);
    }
    
    .modal-body h2 {
        font-size: 20px;
    }
    
    .modal-body h3 {
        font-size: 16px;
    }
    
    .modal-body p {
        font-size: 13px;
    }
    
    .modal-close {
        right: 15px;
        top: 10px;
        font-size: 28px;
    }
}