.firstMobile {
  position: relative;
  overflow: hidden;
  /* background: firebrick; */
}
.firstMobile-bg {
  position: absolute;
  z-index: 1;
  object-fit: cover;
  width: 100%;
  overflow: hidden;
}
.firstMobile-1 {
  position: absolute;
  z-index: 2;
  bottom: 14rem;
  left: 0;
  right: 0;
  margin: auto;
  width: 5rem;
}
.firstMobile-2 {
}
.mobile-allDown {
  position: absolute;
  z-index: 2;
  left: 50%; /* 关键：从左侧50%开始 */
  bottom: 4%;
  transform: translateX(-50%); /* 关键：向左回退自身宽度的50% */
  display: flex;
  align-items: center;
  gap: 1.25rem;
  width: auto; /* 让内容决定宽度 */
  margin: 0 auto; /* 备用居中方案 */
}

.m3-btn {
  position: relative;
}
.mb-15 {
  margin-bottom: 0.9375rem;
}

.mobile-allDown-right {
  /* 移除 margin-left，改用 gap 控制间距 */
}

.m3-btn-main,
.m3-btn .m3-btn-top {
  width: 34vw; /* 保持原有响应式宽度 */
}
.mobile-allDown-right img {
  width: 42vw;
}
.m3-btn .m3-btn-top {
  position: absolute;
  top: -2.5rem;
  left: 0;
  right: 0;
  margin: auto; /* 确保顶部图片居中 */
}