* {
  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: no-repeat;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

body .body img {
  width: 100% !important;
  z-index: -999;
  position: absolute;
  background-repeat: no-repeat;
}

.lbgs {
  display: block;
}

.sbgs {
  display: none;
}

body .body .lSize {
  display: block;
}

body .body .mSize {
  display: none;
}

body .body .sSize {
  display: none;
}

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 */
  }

  .lbgs {
    display: none;
  }

  .sbgs {
    display: block;
  }

  body .body .lSize {
    display: none;
  }

  body .body .mSize {
    display: block;
  }

  body .body .sSize {
    display: none;
  }

  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 .body .lSize {
    display: none;
  }

  .lbgs {
    display: none;
  }

  .sbgs {
    display: block;
  }

  body .body .mSize {
    display: none;
  }

  body .body .sSize {
    display: block;
  }

  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: 50px;
  }

  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: 50px;
  }

  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: 50px;
  }

  body .tabs3 img {
    width: 90vw !important;
  }

  body .tabs3 .lSize {
    display: none;
  }

  body .tabs3 .mSize {
    display: none;
  }

  body .tabs3 .sSize {
    display: block;
  }

  body .btns {
    transition: all 0.5s;
    width: auto;

    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;
  }
}