.youtuo_company_history {
  position: relative;
  aspect-ratio: 1920 / 1056;
  color: #fff;
  font-family: "Poppins";
  overflow: hidden;
}

.youtuo_company_history .container {
  height: 100%;
  position: relative;
  z-index: 2;
  overflow: hidden;
  padding-top: 1.21875rem; /* 39px / 32 */
  display: flex;
  flex-direction: column;
}

.youtuo_company_history_img {
  position: absolute;
  top: 2.59375rem;
  left: 0;
  width: 100%;
  height: calc(100% - 2.59375rem);
}

.youtuo_company_history_bg {
  position: absolute;
  top: 2.59375rem;
  left: 0;
  width: 100%;
  height: calc(100% - 2.59375rem);
  /* 白色雾化遮罩：上淡下浓的线性渐变（参考原型图） */
  background: linear-gradient(180deg, rgba(255, 255, 255) 0%, rgba(255, 255, 255, 0.1) 100%);
}

/* top: title + desc */
.youtuo_company_history_top {
  text-align: left;
}

.youtuo_company_history_title {
  color: #000;
  font-size: var(--font-size-62);
  font-weight: 600;
  line-height: normal;
  text-transform: capitalize;
}

.youtuo_company_history_desc {
  color: #9b9b9b;
  font-size: var(--font-size-36);
  font-weight: 400;
  line-height: 1.38263rem;
}

/* timeline list — 绝对定位容器 */
.youtuo_company_history_list {
  position: relative;
  width: 100%;
  flex: 1;
  overflow: hidden;
  z-index: 2;
}

/* 导航按钮 — 默认隐藏，移动端显示 */
.history-swiper-btn {
  display: none;
}

/* 桌面端（>1200px）：swiper 拖动模式 */
.youtuo_company_history_list .swiper-container {
  height: 100%;
  width: 100%;
  overflow: hidden;
}

.youtuo_company_history_list .swiper-wrapper {
  display: flex;
  align-items: flex-end;
}

.youtuo_company_history_list .swiper-slide {
  position: relative;
  width: auto;
  height: auto;
  flex-shrink: 0;
  bottom: 13.875rem;
  transition: bottom 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.youtuo_company_history_item {
  display: flex;
  gap: 0.6875rem; /* 22px / 32 */
  align-items: stretch;
}

/* 桌面端：每个可见位置不同的bottom值（由JS动态设置） */

/* left: 顶端圆点 + 竖线 */
.youtuo_company_history_item_left {
  position: relative;
  flex-shrink: 0;
  width: 0.1875rem; /* 6px / 32 */
  min-height: 9.50547rem; /* 304.175px / 32 */
  align-self: stretch;
}

/* 顶部圆点 */
.youtuo_company_history_item_left::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 0.1875rem;
  height: 0.1875rem;
  border-radius: 50%;
  background: #fff;
  transform: translateX(-50%);
  transition: background 0.4s ease;
}

/* 圆点下方的竖线 */
.youtuo_company_history_item_left::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 0.0625rem; /* 2px / 32 */
  background: #fff;
  transform: translateX(-50%);
  transition: background 0.4s ease;
}

/* 激活态：圆点+竖线变主色 */
.youtuo_company_history_item:hover .youtuo_company_history_item_left::before,
.youtuo_company_history_item:hover .youtuo_company_history_item_left::after {
  background: var(--color-primary);
}

/* right: year + desc */
.youtuo_company_history_item_right {
  display: flex;
  flex-direction: column;
  gap: 0.1375rem; /* 4.4px / 32 */
  color: #fff;
  transition: color 0.4s ease;
}

/* 激活态：右侧文字变主色 */
.youtuo_company_history_item:hover .youtuo_company_history_item_right {
  color: var(--color-primary);
}

.youtuo_company_history_item_year {
  font-size: var(--font-size-55);
  font-weight: 500;
  line-height: 2.00478rem;
  text-transform: capitalize;
}

.youtuo_company_history_item_desc {
  font-size: var(--font-size-20);
  font-style: normal;
  font-weight: 500;
  line-height: normal;
}

/* bottom orange wave decoration */
.youtuo_company_about_bg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1;
  pointer-events: none;
  line-height: 0;
}

.youtuo_company_about_bg svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ==================== 移动端轮播模式（<1200px） ==================== */
@media (max-width: 1200px) {
  /* 隐藏橙色波浪背景 */
  .youtuo_company_about_bg {
    display: none;
  }

  .youtuo_company_history {
    aspect-ratio: auto;
    min-height: auto;
    padding: 3.125rem 0;
  }

  .youtuo_company_history .container {
    height: auto;
    padding-top: 0;
  }

  .youtuo_company_history_top {
    text-align: center;
    margin-bottom: 2rem;
  }

  .youtuo_company_history_title {
    color: #000;
    font-size: var(--font-size-48);
  }

  .youtuo_company_history_desc {
    color: #666;
    font-size: var(--font-size-22);
  }

  /* 轮播容器 */
  .youtuo_company_history_list {
    overflow: visible;
    /* padding-bottom: 3rem; */
  }

  .youtuo_company_history_list .swiper-container {
    width: 100%;
    overflow: hidden;
  }

  .youtuo_company_history_list .swiper-wrapper {
    display: flex;
  }

  /* 轮播 item — 卡片样式 */
  .youtuo_company_history_list .swiper-slide.youtuo_company_history_item {
    position: relative !important;
    left: auto !important;
    bottom: auto !important;
    top: auto !important;
    width: 100%;
    height: auto;
    transform: none !important;
    opacity: 1 !important;
    will-change: auto;
    background: #fff;
    border-radius: 0.5rem;
    padding: 1.25rem;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  }

  /* 左侧圆点+竖线改为橙色 */
  .youtuo_company_history_list .swiper-slide .youtuo_company_history_item_left::before {
    background: var(--color-primary);
  }

  .youtuo_company_history_list .swiper-slide .youtuo_company_history_item_left::after {
    background: var(--color-primary);
  }

  /* 右侧文字改为深色 */
  .youtuo_company_history_list .swiper-slide .youtuo_company_history_item_right {
    color: #333;
  }

  .youtuo_company_history_list .swiper-slide .youtuo_company_history_item_year {
    color: var(--color-primary);
    font-size: var(--font-size-36);
  }

  .youtuo_company_history_list .swiper-slide .youtuo_company_history_item_desc {
    color: #666;
    font-size: var(--font-size-18);
  }

  /* 导航按钮 */
  .history-swiper-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
  }

  .history-swiper-btn .swiper-button-prev,
  .history-swiper-btn .swiper-button-next {
    position: static;
    width: 2.5rem;
    height: 2.5rem;
    margin: 0;
    background: #fff;
    border-radius: 50%;
  }
  .history-swiper-btn .swiper-button-prev:hover,
  .history-swiper-btn .swiper-button-next:hover {
    background: var(--color-primary);
  }

  .history-swiper-btn .swiper-button-prev::after,
  .history-swiper-btn .swiper-button-next::after {
    display: none;
  }

  .history-swiper-btn .qico {
    font-size: 1rem;
    color: #000;
  }
  .history-swiper-btn .swiper-button-prev:hover .qico,
  .history-swiper-btn .swiper-button-next:hover .qico {
    color: #fff;
  }
}

/* 手机端（<576px） */
@media (max-width: 576px) {
  .youtuo_company_history {
    padding: 2rem 0;
  }

  .youtuo_company_history_title {
    font-size: var(--font-size-36);
  }

  .youtuo_company_history_desc {
    font-size: var(--font-size-18);
  }

  .youtuo_company_history_list .swiper-slide.youtuo_company_history_item {
    padding: 1rem;
  }

  .history-swiper-btn {
    gap: 0.75rem;
  }
}