/* 基础重置：统一盒模型，消除默认边距导致的偏移 */
.about-us,
.about-us * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.about-us {
  position: relative;
  padding: clamp(30px, 4vw, 40px) 0 clamp(20px, 2vw, 20px);
  box-sizing: border-box;
  /* 固定最大宽度，大屏不拉伸 */
  max-width: 1920px;
  margin: 0 auto;
}

/* 容器：Flex布局标准化，消除对齐偏移 */
.about-us .wp {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: clamp(20px, 4vw, 60px);
  padding: 0 clamp(10px, 2vw, 30px);
  margin: 0 auto;
}

/* 图片容器：响应式宽度，防止溢出 */
.about-us .pic {
  width: clamp(45%, 53%, 60%);
  flex-shrink: 0; /* 防止被挤压 */
  display: block;
  overflow: hidden;
  position: relative;
  /* 最小高度兜底，防止图片加载前塌陷 */
  min-height: 300px;
}

.about-us .pic img {
  width: 100%;
  height: auto;
  display: block;
  transition: all 0.3s ease;
  /* 硬件加速，优化动画 */
  will-change: transform;
}

/* 图片悬浮动画：平滑缩放，无偏移 */
.about-us .pic:hover img {
  transform: scale(1.03);
}

/* 图片右下角文本块：响应式尺寸，适配所有屏幕 */
.about-us .pic h5 {
  /* 响应式宽高，替代固定值 */
  width: clamp(180px, 20vw, 308px);
  height: clamp(150px, 16vw, 250px);
  background: var(--color-second);
  text-align: center;
  position: absolute;
  right: 0;
  bottom: 0;
  /* 响应式字体，替代多断点修改 */
  font-size: clamp(24px, 2.5vw, 36px);
  line-height: clamp(32px, 3vw, 48px);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  /* 防止文本溢出 */
  padding: clamp(10px, 2vw, 20px);
  word-break: break-word;
}

/* 文本容器：Flex自适应，固定最大宽度 */
.about-us .txt {
  flex: 1;
  max-width: 600px; /* 防止大屏文本过宽 */
  background: #fff;
  /* 响应式内边距，替代硬编码 */
  padding: clamp(20px, 3vw, 40px) 0 0 clamp(20px, 8vw, 110px);
}

.about-us .txt em {
  font-size: clamp(15px, 1vw, 16px);
  color: #5d5d5d;
  letter-spacing: clamp(5px, 0.6vw, 9px);
  display: block;
  margin: 0 0 15px;
  text-transform: uppercase;
  font-style: normal; /* 消除em默认斜体 */
}

.about-us .txt em i {
  font-size: clamp(16px, 1.1vw, 17px);
}

.about-us .txt h3 {
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1.4;
  color: #000;
  font-weight: 600;
  text-transform: none;
  margin-bottom: 20px; /* 固定底边距，防止偏移 */
}

.about-us .txt h3 span {
  color: var(--color-primary);
}

.about-us .txt .t {
  line-height: clamp(24px, 1.8vw, 30px);
  font-size: clamp(15px, 1vw, 16px);
  color: #5d5d5d;
  margin: 0 0 20px 0;
}

.about-us .txt .t p ~ p {
  margin-top: clamp(10px, 1vw, 15px);
}

.about-us .txt h5 {
  font-size: clamp(22px, 1.5vw, 24px);
  color: #000;
  font-weight: 700;
  margin: 0 0 20px 0;
}

.about-us .txt ul {
  list-style: none;
  margin: 0 0 30px 0;
}

.about-us .txt ul li {
  line-height: 24px;
  font-size: clamp(18px, 1.5vw, 24px);
  color: #000;
  margin: clamp(12px, 1.2vw, 20px) 0 0;
  /* 对齐优化，防止图标偏移 */
  display: flex;
  align-items: center;
}

.about-us .txt ul li img {
  width: 26px;
  margin-right: 8px;
  flex-shrink: 0; /* 防止图标被挤压 */
}

/* 按钮样式：响应式尺寸，平滑过渡 */
.about-us .txt .more {
  margin: 0 0 20px 0;
  width: clamp(170px, 15vw, 200px);
  height: clamp(40px, 3vw, 50px);
  line-height: clamp(40px, 3vw, 50px);
  background: var(--color-second);
  display: block;
  text-align: center;
  font-size: clamp(16px, 1.2vw, 18px);
  color: #fff;
  border-radius: var(--button-radius);
  text-decoration: none; /* 消除链接默认下划线 */
  transition: background 0.3s ease; /* 平滑hover */
}

.about-us .txt .more:hover {
  background: var(--btn-hover);
}

/* 平板端：单列布局，统一样式 */
@media screen and (max-width: 992px) {
  .about-us .wp {
    flex-direction: column;
    gap: 30px;
    padding: 0 20px;
  }

  .about-us .pic {
    width: 100%;
    min-height: 250px;
  }

  /* 图片文本块适配单列布局 */
  .about-us .pic h5 {
    width: 100%;
    height: auto;
    position: relative;
    right: unset;
    bottom: unset;
    margin-top: -5px; /* 衔接图片 */
    background: #000;
    padding: 20px;
  }

  .about-us .txt {
    padding: 20px 0 0;
    max-width: 100%;
  }

  /* 文本居中，提升移动端体验 */
  .about-us .txt em,
  .about-us .txt h3 {
    text-align: center;
  }

  /* 按钮居中 */
  .about-us .txt .more {
    margin: 0 auto 20px;
  }
}

/* 移动端精简：只保留关键调整 */
@media screen and (max-width: 560px) {
  .about-us .pic {
    min-height: 200px;
  }

  /* 进一步缩小字体，适配小屏 */
  .about-us .txt ul li {
    font-size: 18px;
  }
}