/* yuedong_about_history */

/* ── Outer section ── */
.yuedong_about_history_main {
  background: #fff;
  font-family: var(--font-family);
  padding: 2.21875rem 0 0;
}

/* fafafa card */
.yuedong_about_history_main .yuedong_about_history_inner {
  background: #fafafa;
  margin: 0 var(--page-padding);
  padding: 2.28125rem 0 2.5rem;
}

/* Title */
.yuedong_about_history_main .yuedong_about_history_title {
  font-family: var(--title-font-family);
  font-size: var(--font-size-64);
  font-weight: 700;
  color: var(--title-text-color);
  line-height: 1.2;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 1.90625rem;
}

/* Body */
.yuedong_about_history_main .yuedong_about_history_body {
  display: flex;
  width: 100%;
}

/* ── Timeline column: flex:1, position:relative for vline ── */
.yuedong_about_history_main .yuedong_about_history_timeline_col {
  flex: 1;
  min-width: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* Vertical line: absolute, spans full column height through both arrows */
/* vline center = 183px from container left = 5.71875rem */
.yuedong_about_history_main .yuedong_about_history_vline {
  position: absolute;
  left: 5.71875rem;
  top: 1.25rem;
  bottom: 1.25rem;
  width: 1px;
  background: #BFE2EF;
  z-index: 0;
}

/* Arrow buttons: centered on vline
   margin-left = 5.71875 - 0.625 = 5.09375rem */
.yuedong_about_history_main .yuedong_about_history_arrow {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 5.09375rem;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  transition: opacity 0.2s;
}

.yuedong_about_history_main .yuedong_about_history_arrow.is-disabled {
  cursor: default;
}

.yuedong_about_history_main .yuedong_about_history_arrow svg {
  width: 1.25rem;
  height: 1.25rem;
  display: block;
}

.yuedong_about_history_main .yuedong_about_history_arrow:not(.is-disabled):hover svg circle {
  stroke: var(--color-primary);
  transition: stroke 0.2s;
}

.yuedong_about_history_main .yuedong_about_history_arrow:not(.is-disabled):hover svg path {
  stroke: var(--color-primary);
  transition: stroke 0.2s;
}

/* Clipping viewport */
.yuedong_about_history_main .yuedong_about_history_track_wrap {
  width: 100%;
  position: relative;
  overflow: hidden;
  height: 24.53125rem;
  flex-shrink: 0;
}

/* Scrolling container */
.yuedong_about_history_main .yuedong_about_history_items {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  transition: transform 0.4s ease;
}

/* ── Single item: flex row, left text + right image ── */
.yuedong_about_history_main .yuedong_about_history_item {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  min-height: 4.90625rem;
  position: relative;
}

/* Left text column: flex:1 */
.yuedong_about_history_main .yuedong_about_history_text_col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.yuedong_about_history_item:last-child .yuedong_about_history_text_col {
  padding-bottom: 0.3125rem;
}

/* Dot row
   dot_row padding-left = vline_center - diamond_half = 5.71875 - 0.46875 = 5.25rem */
.yuedong_about_history_main .yuedong_about_history_dot_row {
  display: flex;
  align-items: center;
  padding-left: 5.25rem;
  position: relative;
  z-index: 1;
}

/* Diamond marker */
.yuedong_about_history_main .yuedong_about_history_diamond {
  width: 0.9375rem;
  height: 0.9375rem;
  background: #3BC6F9;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  flex-shrink: 0;
  z-index: 1;
}

/* Horizontal connector line */
.yuedong_about_history_main .yuedong_about_history_hline {
  width: 1.5625rem;
  height: 1px;
  background: #BFE2EF;
  flex-shrink: 0;
  margin: 0 0.9375rem 0 -0.3125rem;
}

/* Year */
.yuedong_about_history_main .yuedong_about_history_year {
  font-size: var(--font-size-24);
  font-weight: 400;
  color: var(--title-text-color);
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
}

/* Description */
.yuedong_about_history_main .yuedong_about_history_desc {
  font-size: max(0.4375rem, 12px);
  color: #454545;
  line-height: 1.6;
  padding-left: calc(5.25rem + 0.9375rem + (-0.3125rem) + 1.5625rem + 0.9375rem);
  margin-top: 0.25rem;
  max-width: 90%;
}

/* ── Right image column: fixed 297px, margin-right 165px ──
   margin-top = text_col padding-top(0.5rem) + 9px(0.28125rem) offset below year top */
.yuedong_about_history_main .yuedong_about_history_img_col {
  flex: 0 0 9.28125rem;
  width: 9.28125rem;
  margin-right: 5.15625rem;
  margin-top: calc(0.5rem + 0.28125rem);
  flex-shrink: 0;
  align-self: flex-start;
}

.yuedong_about_history_main .yuedong_about_history_img_col img {
  width: 100%;
  height: 4rem;
  object-fit: cover;
  display: block;
}

/* Mobile image: hidden on desktop/pad */
.yuedong_about_history_main .yuedong_about_history_img_mobile {
  display: none;
}

/* ─── Responsive ───
   vline_left = V
   arrow_margin_left = V - 0.625rem
   dot_row_padding = V - 0.46875rem
   desc_padding = dot_row_padding + 0.9375 + (-0.3125) + 1.5625 + 0.9375 = dot_row_padding + 3.125rem
*/

.yuedong_about_history_arrow_down {
  transform: translateY(-100%);
  background: #FAFAFA;
}

@media screen and (max-width: 1400px) {
  .yuedong_about_history_main {
    padding: 2.1875rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_title {
    font-size: var(--font-size-56);
  }

  /* V = 4.625rem */
  .yuedong_about_history_main .yuedong_about_history_vline {
    left: 4.625rem;
  }

  .yuedong_about_history_main .yuedong_about_history_arrow {
    margin-left: 4rem;
  }

  .yuedong_about_history_main .yuedong_about_history_dot_row {
    padding-left: 4.15625rem;
  }

  .yuedong_about_history_main .yuedong_about_history_desc {
    padding-left: calc(4.15625rem + 3.125rem);
  }

  .yuedong_about_history_main .yuedong_about_history_img_col {
    margin-right: 3rem;
  }
}

@media screen and (max-width: 1200px) {
  .yuedong_about_history_main {
    padding: 1.875rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_title {
    font-size: var(--font-size-48);
  }

  /* V = 3.75rem */
  .yuedong_about_history_main .yuedong_about_history_vline {
    left: 3.75rem;
  }

  .yuedong_about_history_main .yuedong_about_history_arrow {
    margin-left: 3.125rem;
  }

  .yuedong_about_history_main .yuedong_about_history_dot_row {
    padding-left: 3.28125rem;
  }

  .yuedong_about_history_main .yuedong_about_history_desc {
    padding-left: calc(3.28125rem + 3.125rem);
  }

  .yuedong_about_history_main .yuedong_about_history_img_col {
    margin-right: 2rem;
  }

  .yuedong_about_history_arrow_down {
    transform: translateY(0%);
  }
}

@media screen and (max-width: 992px) {
  .yuedong_about_history_main {
    padding: 1.5625rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_title {
    font-size: var(--font-size-40);
  }

  /* V = 2.65625rem */
  .yuedong_about_history_main .yuedong_about_history_vline {
    left: 2.65625rem;
  }

  .yuedong_about_history_main .yuedong_about_history_arrow {
    margin-left: 2.03125rem;
  }

  .yuedong_about_history_main .yuedong_about_history_dot_row {
    padding-left: 2.1875rem;
  }

  .yuedong_about_history_main .yuedong_about_history_desc {
    padding-left: calc(2.1875rem + 3.125rem);
  }

  .yuedong_about_history_main .yuedong_about_history_img_col {
    margin-right: 1rem;
  }
}

@media screen and (max-width: 768px) {
  .yuedong_about_history_main {
    padding: 1.25rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_inner {
    padding: 1.5rem 0 1.875rem;
  }

  .yuedong_about_history_main .yuedong_about_history_title {
    font-size: var(--font-size-36);
    margin-bottom: 1.25rem;
  }

  /* V = 1.875rem */
  .yuedong_about_history_main .yuedong_about_history_vline {
    left: 1.875rem;
  }

  .yuedong_about_history_main .yuedong_about_history_arrow {
    margin-left: 1.25rem;
  }

  .yuedong_about_history_main .yuedong_about_history_dot_row {
    padding-left: 1.40625rem;
  }

  .yuedong_about_history_main .yuedong_about_history_desc {
    padding-left: calc(1.40625rem + 3.125rem);
  }

  .yuedong_about_history_main .yuedong_about_history_img_col {
    margin-right: 0.5rem;
  }
}

@media screen and (max-width: 576px) {
  .yuedong_about_history_main {
    padding: 0.9375rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_inner {
    padding: 1.25rem 0 1.5rem;
  }

  .yuedong_about_history_main .yuedong_about_history_title {
    font-size: var(--font-size-32);
    margin-bottom: 1rem;
  }

  /* V = 1.5rem */
  .yuedong_about_history_main .yuedong_about_history_vline {
    left: 1.5rem;
  }

  .yuedong_about_history_main .yuedong_about_history_arrow {
    margin-left: 0.875rem;
  }

  .yuedong_about_history_main .yuedong_about_history_dot_row {
    padding-left: 1.03125rem;
  }

  .yuedong_about_history_main .yuedong_about_history_desc {
    padding-left: calc(1.03125rem + 3.125rem);
  }

  .yuedong_about_history_main .yuedong_about_history_img_col {
    margin-right: 0;
  }
}


@media screen and (max-width: 480px) {
  .yuedong_about_history_main {
    padding: 0.9375rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_inner {
    padding: 1rem 0 1.25rem;
  }

  .yuedong_about_history_main .yuedong_about_history_title {
    font-size: var(--font-size-28);
    margin-bottom: 0.875rem;
  }

  .yuedong_about_history_main .yuedong_about_history_item {
    flex-direction: column;
    align-items: flex-start;
    min-height: unset;
    height: auto;
    padding: 0.75rem 0;
  }

  .yuedong_about_history_main .yuedong_about_history_item:last-child {
    padding-bottom: 0;
  }
  .yuedong_about_history_main .yuedong_about_history_track_wrap{
    height: 860px;
  }

  .yuedong_about_history_main .yuedong_about_history_arrow {
    display: none;
  }

  .yuedong_about_history_main .yuedong_about_history_vline { display: none; }
  .yuedong_about_history_main .yuedong_about_history_diamond { display: none; }
  .yuedong_about_history_main .yuedong_about_history_hline { display: none; }

  .yuedong_about_history_main .yuedong_about_history_dot_row {
    padding-left: 0;
  }

  .yuedong_about_history_main .yuedong_about_history_year {
    font-size: var(--font-size-20);
    font-weight: 700;
  }

  .yuedong_about_history_main .yuedong_about_history_desc {
    padding-left: 0;
    margin-top: 0.375rem;
    max-width: 100%;
  }

  .yuedong_about_history_main .yuedong_about_history_img_col {
    display: none;
  }

  .yuedong_about_history_main .yuedong_about_history_track_wrap {
    height: auto;
  }

  .yuedong_about_history_main .yuedong_about_history_img_mobile {
    display: block;
    margin-top: 0.625rem;
    width: 100%;
  }

  .yuedong_about_history_main .yuedong_about_history_img_mobile img {
    width: 100%;
    height: auto;
    aspect-ratio: 297 / 128;
    object-fit: cover;
    display: block;
  }
  .yuedong_about_history_year{
    margin-top: 0.625rem;
  }
}