.tongda_about_history {
  --tongda-history-point-size: 1.375rem;
  --tongda-history-point-offset: 3.5625rem;
  --tongda-history-offset-1: 2rem;
  --tongda-history-offset-2: 5.625rem;
  --tongda-history-offset-3: 8.75rem;
  position: relative;
  padding-top: 6.9375rem;
  padding-bottom: 8.125rem;
  background: #fff;
}

.tongda_about_history .container {
  position: relative;
  z-index: 2;
}

.tongda_about_history_title {
  width: 63.4375rem;
  margin: 0 0 0 0.125rem;
  color: #000;
  font-family: var(--font-family);
  line-height: 1.2;
  text-transform: capitalize;
}

.tongda_about_history_nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 2.5625rem;
}

.tongda_about_history_nav_button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(18, 18, 18, 0.2);
  width: 3.75rem;
  height: 3.75rem;
  flex-shrink: 0;
  padding: 0;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  transition:
    background 0.3s ease,
    opacity 0.3s ease,
    transform 0.3s ease;
}

.tongda_about_history_nav_button:hover {
  background: var(--color-primary);
}

/* .tongda_about_history_nav_button:hover:not(:disabled),
.tongda_about_history_nav_button:focus-visible:not(:disabled) {
  background: var(--color-primary);
  transform: translateY(-0.125rem);
}

.tongda_about_history_nav_button:focus-visible {
  outline: 0.125rem solid var(--color-primary);
  outline-offset: 0.1875rem;
} */

.tongda_about_history_nav_button .tongda_about_history_nav_image {
  display: block;
  width: 14px;
  height: 14px;
  object-fit: contain;
}

.tongda_about_history_timeline {
  margin-top: 5.6875rem;
}

.tongda_about_history_swiper {
  position: relative;
  overflow: hidden;
}

.tongda_about_history_line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0.1875rem;
  z-index: 0;
  height: 0.0625rem;
  background: #d3d3d3;
  visibility: hidden;
  transform: translateY(-50%);
  pointer-events: none;
}

.tongda_about_history_line.is-positioned {
  visibility: visible;
}

.tongda_about_history_swiper .swiper-wrapper {
  position: relative;
  z-index: 1;
  align-items: flex-start;
}

.tongda_about_history_slide {
  height: auto;
  overflow: visible;
}

.tongda_about_history_year_button {
  display: block;
  width: max-content;
  padding: 0;
  color: #000;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  transition:
    color 0.3s ease,
    opacity 0.3s ease,
    transform 0.6s ease;
}

.tongda_about_history_year_button:hover,
.tongda_about_history_year_button:focus-visible {
  color: var(--color-primary);
}

.tongda_about_history_year_button:focus-visible {
  outline: 0.125rem solid var(--color-primary);
  outline-offset: 0.25rem;
}

.tongda_about_history_year {
  display: block;
  color: inherit;
  font-family: var(--font-family);
  font-size: var(--font-size-80);
  font-weight: var(--font-weight-xl);
  line-height: 1.225;
  white-space: nowrap;
}

.tongda_about_history_slide.swiper-slide-active
  + .tongda_about_history_slide
  .tongda_about_history_year_button {
  transform: translateX(var(--tongda-history-offset-1));
}

.tongda_about_history_slide.swiper-slide-active
  + .tongda_about_history_slide
  + .tongda_about_history_slide
  .tongda_about_history_year_button {
  transform: translateX(var(--tongda-history-offset-2));
}

.tongda_about_history_slide.swiper-slide-active
  + .tongda_about_history_slide
  + .tongda_about_history_slide
  + .tongda_about_history_slide
  .tongda_about_history_year_button {
  transform: translateX(var(--tongda-history-offset-3));
}

.tongda_about_history_point {
  position: relative;
  z-index: 2;
  display: block;
  width: var(--tongda-history-point-size);
  height: var(--tongda-history-point-size);
  margin-top: var(--tongda-history-point-offset);
  border-radius: 50%;
  background: #d8d8d8;
  transition:
    background 0.3s ease,
    transform 0.3s ease;
}

.tongda_about_history_description {
  width: 100%;
  margin-top: 1.3125rem;
  color: #121212;
  font-family: var(--font-family);
  font-size: var(--font-size-24);
  font-weight: var(--font-weight-md);
  line-height: 1.5;
  word-break: break-word;
}

.tongda_about_history_slide.is-active .tongda_about_history_year_button {
  color: var(--color-primary);
}

.tongda_about_history_slide.is-active .tongda_about_history_point {
  background: var(--color-primary);
  transform: scale(1.02);
}

.tongda_about_history_bg_text {
  position: absolute;
  bottom: 0px;
  right: calc(var(--root-container-spacing) / 2);
  z-index: 0;
  display: block;
  width: max-content;
  margin: 0;
  color: rgba(246, 246, 246, 0.8);
  font-family: var(--font-family-orbitron);
  font-size: clamp(8rem, 16.7708vw, 20.125rem);
  transform: translate3d(0, 75%, 0);
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
  pointer-events: none;
  animation-name: tongdaAboutHistoryBgEnter;
  animation-duration: 0.9s;
  animation-timing-function: ease-out;
  animation-fill-mode: both;
}

@keyframes tongdaAboutHistoryBgEnter {
  from {
    opacity: 0;
    transform: translate3d(20%, 75%, 0);
  }

  to {
    opacity: 1;
    transform: translate3d(0, 75%, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tongda_about_history_bg_text {
    animation: none;
    transform: translate3d(0, 75%, 0);
  }
}

@media screen and (max-width: 1024px) {
  .tongda_about_history {
    --tongda-history-point-size: 1.125rem;
    --tongda-history-point-offset: 2.5rem;
    --tongda-history-offset-1: 0rem;
    --tongda-history-offset-2: 0rem;
    --tongda-history-offset-3: 0rem;
    padding: 3.75rem 0;
  }

  .tongda_about_history_title {
    width: 100%;
    margin-left: 0;
  }

  .tongda_about_history_nav {
    gap: 1rem;
    margin-top: 2rem;
  }

  .tongda_about_history_nav_button {
    width: 48px;
    height: 48px;
  }

  .tongda_about_history_timeline {
    margin-top: 3.5rem;
  }

  .tongda_about_history_bg_text {
    left: 0;
    width: 100%;
    font-size: clamp(7rem, 18vw, 12rem);
    text-align: right;
  }
}

@media screen and (max-width: 768px) {
  .tongda_about_history {
    --tongda-history-point-size: 1rem;
    --tongda-history-point-offset: 2rem;
    padding: 3rem 0;
  }

  .tongda_about_history_timeline {
    margin-top: 3rem;
  }

  .tongda_about_history_bg_text {
    font-size: clamp(6rem, 20vw, 10rem);
  }
}

@media screen and (max-width: 576px) {
  .tongda_about_history {
    --tongda-history-point-size: 0.875rem;
    --tongda-history-point-offset: 1.75rem;
    padding: 2.5rem 0;
  }

  .tongda_about_history_nav {
    gap: 0.75rem;
    margin-top: 1.5rem;
  }

  .tongda_about_history_nav_button {
    width: 44px;
    height: 44px;
  }

  .tongda_about_history_timeline {
    margin-top: 2.5rem;
  }

  .tongda_about_history_bg_text {
    font-size: clamp(5rem, 24vw, 6rem);
  }
}