* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  border: none !important;
}
.btns {
  transition: all 0.5s;
  width: 60px !important;
  height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: fixed;
  right: 5% ;
  top: 50% ;
  transform: translateY(-70%);
}
.btns a {
  width: 60px;
  height: 50px;
  animation: scaleAnim 1s infinite alternate;
  /* 添加动画 */
  cursor: pointer;
  transform-origin: center;
}
@keyframes scaleAnim {
  0% {
    transform: scale(1);
    /* 初始大小 */
  }
  100% {
    transform: scale(1.1);
    /* 放大50% */
  }
}
/* 默认样式：适配大屏（1920px） */
body {
    font-size: 18px;
    /* 大屏文字较大 */
    margin: 0 auto;
    background-repeat:repeat-x;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
body .header img {
  width: 100vw !important;
}
body .header .lSize {
  display: block;
}
body .header .mSize {
  display: none;
}
body .header .sSize {
  display: none;
}
body .title {
  display: flex;
  justify-content: center;
  text-align: center;
}
body .title img {
  width: 80vw !important;
}
body .title .lSize {
  display: block;
}
body .title .mSize {
  display: none;
}
body .title .sSize {
  display: none;
}
body .tabs1 {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin-bottom: 30px;
}
body .tabs1 img {
  width: 70vw !important;
}
body .tabs1 .lSize {
  display: block;
}
body .tabs1 .mSize {
  display: none;
}
body .tabs1 .sSize {
  display: none;
}
body .tabs2 {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin-bottom: 30px;
}
body .tabs2 img {
  width: 70vw !important;
}
body .tabs2 .lSize {
  display: block;
}
body .tabs2 .mSize {
  display: none;
}
body .tabs2 .sSize {
  display: none;
}
body .tabs3 {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin-bottom: 30px;
}
body .tabs3 img {
  width: 70vw !important;
}
body .tabs3 .lSize {
  display: block;
}
body .tabs3 .mSize {
  display: none;
}
body .tabs3 .sSize {
  display: none;
}

    body .tabs4 {
        display: flex;
        justify-content: center;
        align-items: center;
        flex-direction: column;
        margin-bottom:30px;
    }

        body .tabs4 img {
            width: 70vw !important;
        }

        body .tabs4 .lSize {
            display: block;
        }

        body .tabs4 .mSize {
            display: none;
        }

        body .tabs4 .sSize {
            display: none;
        }

/* 中屏（1366px） */
@media (max-width: 1366px) {
  body {
    font-size: 16px;
    /* 中屏文字稍小 */
  }
  body .header .lSize {
    display: none;
  }
  body .header .mSize {
    display: block;
  }
  body .header .sSize {
    display: none;
  }
  body .title {
    transform: translateY(-0.5%);
  }
  body .title .lSize {
    display: none;
  }
  body .title .mSize {
    display: block;
  }
  body .title .sSize {
    display: none;
  }
  body .tabs1 img {
    width: 90vw !important;
  }
  body .tabs1 .lSize {
    display: none;
  }
  body .tabs1 .mSize {
    display: block;
  }
  body .tabs1 .sSize {
    display: none;
  }
  body .tabs2 img {
    width: 90vw !important;
  }
  body .tabs2 .lSize {
    display: none;
  }
  body .tabs2 .mSize {
    display: block;
  }
  body .tabs2 .sSize {
    display: none;
  }
  body .tabs3 img {
    width: 90vw !important;
  }
  body .tabs3 .lSize {
    display: none;
  }
  body .tabs3 .mSize {
    display: block;
  }
  body .tabs3 .sSize {
    display: none;
  }
}
/* 小屏（750px，例如手机） */
@media (max-width: 750px) {
  body {
    font-size: 14px;
    /* 小屏文字最小 */
  }
  body .header .lSize {
    display: none;
  }
  body .header .mSize {
    display: none;
  }
  body .header .sSize {
    display: block;
  }
  body .title {
    padding: 0;
    width: 100%;
    margin-bottom: 0;
    transform: translateY(-1%);
  }
  body .title .lSize {
    display: none;
  }
  body .title .mSize {
    display: none;
  }
  body .title .sSize {
    display: block;
    width: 100vw !important;
  }
  body .tabs1 {
    margin-bottom: 5px;
  }
  body .tabs1 img {
    width: 90vw !important;
  }
  body .tabs1 .lSize {
    display: none;
  }
  body .tabs1 .mSize {
    display: none;
  }
  body .tabs1 .sSize {
    display: block;
  }
  body .tabs2 {
    margin-bottom: 5px;
  }
  body .tabs2 img {
    width: 90vw !important;
  }
  body .tabs2 .lSize {
    display: none;
  }
  body .tabs2 .mSize {
    display: none;
  }
  body .tabs2 .sSize {
    display: block;
  }
  body .tabs3 {
    margin-bottom: 5px;
  }
  body .tabs3 img {
    width: 90vw !important;
  }
  body .tabs3 .lSize {
    display: none;
  }
  body .tabs3 .mSize {
    display: none;
  }
  body .tabs3 .sSize {
    display: block;
  }
    body .tabs4 {
    margin-bottom: 5px;
  }
  body .tabs4 img {
    width: 90vw !important;
  }
  body .tabs4 .lSize {
    display: none;
  }
  body .tabs4 .mSize {
    display: none;
  }
  body .tabs4 .sSize {
    display: block;
  }
  body .btns {
    transition: all 0.5s;
    width: auto;
    height: 95px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: fixed;
    right: 10px !important;
    top: 50% !important;
    transform: translateY(-70%);
  }
  body .btns a {
    width: 20px;
    height: 20px;
  }
}