*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
a{
    /* 清除下划线 */
    text-decoration: none;
    /* 清除默认文本颜色（通常是蓝色） */
    color: inherit;
    /* 清除点击时的焦点边框（部分浏览器） */
    outline: none;
    /* 清除点击时的背景高亮（移动端） */
    -webkit-tap-highlight-color: transparent;
}
html{
    max-width: 100vw;
    overflow-x: hidden;
}
body{
    width: 100vw;
    max-width: 100vw;
    overflow-x: hidden;
}
.flex-row{
    display: flex;
    flex-direction: row;
}
.space-around{
    justify-content: space-around;
}
.space-between{
    justify-content: space-between;
}
.t-center{
    text-align: center;
}
.relative{
    position: relative;
}
.nav{
    position: sticky;
    top: 1rem;
    padding: 0 5vw;
    margin-top: 3rem;
    color: #fff;
    height: 4rem;
}
.wrap{
    display: flex;
    flex-direction: row;
}
.nav-logo{
    width: 9rem;
    padding: 0 2rem;
}
.nav-logo img{
    width: 5rem;
    height: auto;
}
.nav-menu{
    flex: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;
}
a.m-active{
    text-decoration: underline; 
    text-decoration-thickness: 0.1rem; /* 下划线厚度 */
    text-decoration-style: solid; /* 下划线样式（solid/dashed/dotted/wavy） */
    text-underline-offset: 0.3rem; /* 下划线与文字的距离（正数向下偏移） */
}
a.active{
    background-color: #e02020;
    padding: 0.3rem 0.6rem;
    border-radius: 0.4rem;
}

.section{
    width: 100vw;
    margin-top: -7rem;
}
.hero-banner{
    width: 100%;
    color: #fff;
}
.hero-banner-bg{
    background-image: url("banner_bg.jpg");
    background-size: 100% 100%;
    background-position: center;
    width: 100%;
    padding-top: 9rem;
}

.hero-content{
    text-align: center;
}
.hero-logo{
    width: 8rem;
    display: inline-block;
    margin: 1.5rem;
}
.hero-logo img{
    width: 100%;
    height: auto;
}
.hero-title, .hero-subtitle{
    font-size: 2.5rem;
}
.hero-partner{
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}
.hero-partner img{
    width: 1.8rem;
}
.hero-banner-bg .stats{
    justify-content: space-between;
    padding: 3rem 1rem;
    font-size: 0.8rem;
    line-height: 1.2rem;
}
.stats .line{
    width: 0.1rem;
    height: 1.2rem;
    background-color: #fff;
}

.swiper-banner{
    padding: 4rem 0;
}
.left-btn, .right-btn{
    width: 15vw;
    display: flex;
    align-items: center;
    justify-content: center;
}
.ceter_box{
    flex: 1;
}
.swiper-item{
    display: none;
}
.swiper-item.active{
    display: block;
}

.screen-content{
    width: 100%;
    padding: 0 10vw;
}
.screen-content img{
    width: 100%;
}
.showcase-content{
    padding: 2rem 5vw;
}
.showcase-content h3{
    font-size: 1.4rem;
}
.showcase-content h3::after{
    display: block;
    content: "";
    width: 3rem;
    height: 0.2rem;
    margin-top: 0.3rem;
    background-color: #007aff;
}
.feature-highlight{
    padding: 1rem 0;
    color: #666;
}

.feature-list{
    list-style: none;
}
.feature-list li{
    position: relative;
    padding-left: 2.8rem;
    margin-bottom: 1.6rem;
    font-size: 1.2rem;
    line-height: 1.5rem;
    color: #666;
}
.feature-list li::before{
    content: "✓";
    position: absolute;
    left: 0;
    color: #007aff;
    font-weight: bold;
    font-size: 1.8rem;
}
.feature-stats .stat:nth-child(1){
    margin-right: 3rem;
}
.stat .number{
    font-size: 3rem;
    color: #007aff;
}
.stat .label{
    text-align: center;
    color: #666;
}
.data-source{
    color: #666;
}
.slider-arrow{
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: none;
    background-color: #fff;
    box-shadow: 0 0.4rem 1.2rem rgba(0, 0, 0, 0.1);
}
.showcase-dots{
    text-align: center;
}
.showcase-dots .dot{
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    border: none;
    margin: 0 0.5rem;
}
.dot.active{
    background-color: #007aff;
}

.ex{
    background-color: #f5f5f5;
}
.section-title{
    padding: 5rem 0 1.5rem 0;
}
.section-subtitle{
    padding-bottom: 2rem;
}
.card-box{
    padding: 0 20vw;
}
.case-card-front{
    background-color: #fff;
    border-radius: 1rem;
    padding-bottom: 3rem;
    margin-bottom: 3rem;
    height: 22rem;
    backface-visibility: hidden;
}
.case-card-back{
    height: 22rem;
    padding: 0 3rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    text-align: left;
    backface-visibility: hidden;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0;
    transform: rotateY(180deg);
}
.ccb1{
    background: url(card-1-hover.png) right bottom no-repeat, linear-gradient(to bottom, #fd6f6f, #353334);
    background-size: 5rem, 100% 100%;
}
.ccb2{
    background: url(card-2-hover.png) right bottom no-repeat, linear-gradient(to bottom, #fd6f6f, #353334);
    background-size: 5rem, 100% 100%;
}
.ccb3{
    background: url(card-3-hover.png) right bottom no-repeat, linear-gradient(to bottom, #fd6f6f, #353334);
    background-size: 5rem, 100% 100%;
}
.fb-card{
    transition: transform 0.6s; /* 翻转过渡动画 */
    transform-style: preserve-3d; /* 保持3D空间 */
}
.fb-card.flipped{
    transform: rotateY(180deg);
}
.case-card-back .back-description:nth-child(2){
    padding-top: 1rem;
}
.back-description{
    text-indent: 2rem;
}
.case-card-front img{
    width: 5rem;
    height: 5rem;
    margin: 2.5rem 0 1.5rem;
}
.case-title{
    margin-bottom: 1.5rem;
}
.case-description{
    color: #666;
}
.case-link{
    display: inline-block;
    color: #007aff;
    margin-top: 2rem;
}
.more{
    font-size: 1.5rem;
    padding-bottom: 3rem;
}

.footer{
    background-color: #000;
    color: #fff;
}

.contact-form {
  width: 100%;
  margin: 0 auto;
  padding: 0 15vw;
  padding-top: 3rem;
}

.form-row {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.form-input {
  flex: 1;
  height: 3rem;
  padding: 0 2rem;
  border: none;
  border-radius: 0;
  font-size: 1.6rem;
  background: #fff;
  color: #333;
}

.form-input::placeholder {
  color: #999;
  font-size: 1.6rem;
}

.form-input:focus {
  outline: none;
  background: #fff;
}

textarea.form-input {
  width: 100%;
  min-height: 10rem;
  padding: 1.5rem 2rem;
  resize: none;
}

.submit-btn {
  background: #fff;
  color: #000;
  border: none;
  padding: 1.2rem 4rem;
  border-radius: 0;
  font-size: 1.6rem;
  cursor: pointer;
  margin-top: 2rem;
  transition: none;
}

.submit-btn:hover {
  background: #fff;
  transform: none;
}
.address{
    padding: 4rem;
    font-size: 1.5rem;
}