* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body,
html {
  overflow-x: hidden;
  font-size: 16px;
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

/* 基础样式 */
video {
  width: 100%;
  height: 100vh;
  object-fit: cover;
}

.imgs-hober {
  transition: all 0.3s ease;
}

.imgs-hober:hover {
  transform: scale(1.1);
}

/* 头部区域 */
.header {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.logo {
  position: absolute;
  top: 1rem;
  left: 2rem;
  height: 8rem;
  z-index: 10;
}

.age-tip {
  position: absolute;
  bottom: 2rem;
  left: 2rem;
  width: 4rem;
  z-index: 10;
}

.slogan {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  max-width: 80rem;
  z-index: 10;
}

.download-btn {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

.download-btn img {
  height: 5rem;
}

/* 页脚 */
.footer {
  width: 100%;
  padding: 1rem 0;
  background-color: #000;
  color: #fff;
  text-align: center;
  font-size: 1rem;
}

.footer img {
  height: 0.8rem;
  vertical-align: middle;
  margin: 0 0.3rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .logo {
    height: 2rem;
    left: 1rem;
    top: 0.5rem;
  }

  .age-tip {
    top: 8rem;
    left: 1rem;
    width: 3rem;
  }

  .slogan {
    width: 90%;
  }

  .download-btn {
    bottom: 2rem;
  }

  .download-btn img {
    height: 2rem;
  }

  .footer {
    font-size: 0.7rem;
    padding: 0.8rem 0;
  }
}

@media (max-width: 480px) {
  .logo {
    height: 1.5rem;
  }

  .age-tip {
    top: 6rem;
    width: 2.5rem;
  }

  .download-btn img {
    height: 1.8rem;
  }
}