/* =========================================================
   TIMELINE BASE
========================================================= */

.timeline-list-block {
  position: relative;
}


/* =========================================================
   DESKTOP
   Event 1 + Event 2 同一行
   Event 3 + Event 4 同一行
========================================================= */

@media screen and (min-width: 750px) {

  .timeline-list-block {
    display: grid;

    grid-template-columns:
      minmax(0, 1fr)
      minmax(0, 1fr);

    column-gap: 6rem;
    row-gap: 0;

    width: 100%;
  }


  /* 中间时间轴 */
  .timeline-list-block::after {
    content: "";

    position: absolute;

    top: 0;
    bottom: 0;
    left: 50%;

    z-index: 0;

    width: 1px;

    transform: translateX(-50%);

    background:
      rgba(
        var(--color-foreground),
        0.12
      );
  }


  /* =====================================================
     EVENT BASE
  ===================================================== */

  .timeline-list-block .event-block {
    position: relative;

    display: block;

    width: 100%;
    min-width: 0;

    margin: 0;
  }


  .timeline-list-block
    .event-block
    .event-content {

    display: block;

    width: 100%;
    max-width: 100%;

    margin: 0;
    padding: 0;
  }


  .timeline-list-block
    .event-block
    .event-content
    .content-group {

    width: 100%;
    max-width: 100%;

    box-sizing: border-box;

    padding-top: 4rem;
    padding-bottom: 4rem;
    padding-inline: 0;
  }


  /* =====================================================
     ODD EVENTS
     Event 1 / 3 / 5...
     左边
  ===================================================== */

  .timeline-list-block
    .event-block:nth-child(odd) {

    grid-column: 1;

    padding-right: 3rem;
  }


  .timeline-list-block
    .event-block:nth-child(odd)
    .event-content,

  .timeline-list-block
    .event-block:nth-child(odd)
    .content-group {

    text-align: right;
  }


  /* =====================================================
     EVEN EVENTS
     Event 2 / 4 / 6...
     右边
  ===================================================== */

  .timeline-list-block
    .event-block:nth-child(even) {

    grid-column: 2;

    padding-left: 3rem;
  }


  .timeline-list-block
    .event-block:nth-child(even)
    .event-content,

  .timeline-list-block
    .event-block:nth-child(even)
    .content-group {

    text-align: left;
  }


  /* =====================================================
     每两个 Event 在同一行
  ===================================================== */

  .timeline-list-block .event-block:nth-child(1),
  .timeline-list-block .event-block:nth-child(2) {
    grid-row: 1;
  }

  .timeline-list-block .event-block:nth-child(3),
  .timeline-list-block .event-block:nth-child(4) {
    grid-row: 2;
  }

  .timeline-list-block .event-block:nth-child(5),
  .timeline-list-block .event-block:nth-child(6) {
    grid-row: 3;
  }

  .timeline-list-block .event-block:nth-child(7),
  .timeline-list-block .event-block:nth-child(8) {
    grid-row: 4;
  }

  .timeline-list-block .event-block:nth-child(9),
  .timeline-list-block .event-block:nth-child(10) {
    grid-row: 5;
  }

  .timeline-list-block .event-block:nth-child(11),
  .timeline-list-block .event-block:nth-child(12) {
    grid-row: 6;
  }

  .timeline-list-block .event-block:nth-child(13),
  .timeline-list-block .event-block:nth-child(14) {
    grid-row: 7;
  }

  .timeline-list-block .event-block:nth-child(15),
  .timeline-list-block .event-block:nth-child(16) {
    grid-row: 8;
  }


  /* =====================================================
     删除旧版每个 Event 自带竖线
  ===================================================== */

  .timeline-list-block
    .event-block::after {

    display: none;
  }


  /* =====================================================
     时间轴圆点
     每一对 Event 只显示一个圆点
  ===================================================== */

  .timeline-list-block
    .event-block::before {

    display: none;
  }


  .timeline-list-block
    .event-block:nth-child(odd)::before {

    content: "";

    display: block;

    position: absolute;

    top: 4rem;
    right: -3rem;

    z-index: 3;

    width: 0.875rem;
    height: 0.875rem;

    border-radius: 50%;

    transform: translateX(50%);

    background:
      rgba(
        var(--color-foreground),
        1
      );
  }


  /* =====================================================
     IMAGE
  ===================================================== */

  .timeline-list-block
    .image-block {

    position: relative;

    width: auto;
    max-width: 100%;

    height: auto;

    overflow: visible;
  }


  .timeline-list-block
    .image-block.media--adapt {

    width: auto;
    max-width: 100%;

    height: auto;

    aspect-ratio: auto;
  }


  .timeline-list-block
    .image-block.media--adapt::before {

    display: none;
    content: none;
  }


  .timeline-list-block
    .image-block.media--adapt img {

    position: relative;

    display: block;

    width: auto;
    max-width: 100%;

    height: auto;

    inset: auto;

    object-fit: contain;
  }


  /* 左边图片靠右 */
  .timeline-list-block
    .event-block:nth-child(odd)
    .image-block {

    margin-left: auto;
    margin-right: 0;
  }


  .timeline-list-block
    .event-block:nth-child(odd)
    .image-block img {

    margin-left: auto;
    margin-right: 0;
  }


  /* 右边图片靠左 */
  .timeline-list-block
    .event-block:nth-child(even)
    .image-block {

    margin-left: 0;
    margin-right: auto;
  }


  .timeline-list-block
    .event-block:nth-child(even)
    .image-block img {

    margin-left: 0;
    margin-right: auto;
  }


  /* =====================================================
     VIDEO
  ===================================================== */

  .timeline-list-block
    .video-block {

    max-width: 100%;
  }

}


/* =========================================================
   ANIMATION
   PC + MOBILE
========================================================= */

@media (prefers-reduced-motion: no-preference) {

  /* 默认隐藏 */
  .timeline-list-block
    .event-block
    .event-content {

    visibility: hidden;
    opacity: 0;
  }


  /* =====================================================
     DESKTOP ANIMATION
  ===================================================== */

  @media screen and (min-width: 750px) {

    /* 左边从左飞入 */
    .timeline-list-block
      .event-block:nth-child(odd)
      .event-content {

      --timeline-animation:
        slideInFromLeft;
    }


    /* 右边从右飞入 */
    .timeline-list-block
      .event-block:nth-child(even)
      .event-content {

      --timeline-animation:
        slideInFromRight;
    }

  }


  /* =====================================================
     MOBILE ANIMATION
  ===================================================== */

  @media screen and (max-width: 749px) {

    /* 奇数从左飞入 */
    .timeline-list-block
      .event-block:nth-child(odd)
      .event-content {

      --timeline-animation:
        slideInFromLeft;
    }


    /* 偶数从右飞入 */
    .timeline-list-block
      .event-block:nth-child(even)
      .event-content {

      --timeline-animation:
        slideInFromRight;
    }

  }


  /* =====================================================
     SCROLL 激活
  ===================================================== */

  .timeline-list-block
    .event-block.synergy-position--2
    .event-content {

    visibility: visible;

    animation-name:
      var(--timeline-animation);

    animation-duration: 0.45s;

    animation-timing-function:
      cubic-bezier(0, 0, 0.3, 1);

    animation-fill-mode: forwards;
  }


  /* =====================================================
     圆点动画
  ===================================================== */

  .timeline-list-block
    .event-block::before {

    transition:
      width 0.3s cubic-bezier(0, 0, 0.3, 1),
      height 0.3s cubic-bezier(0, 0, 0.3, 1),
      opacity 0.3s ease;
  }


  .timeline-list-block
    .event-block.synergy-position--2::before {

    --color-pulse:
      var(--color-foreground);

    animation:
      pulse
      1.2s
      cubic-bezier(0, 0, 0.3, 1)
      infinite;
  }

}


/* =========================================================
   MOBILE
========================================================= */

@media screen and (max-width: 749px) {

  .timeline-list-block {

    display: block;

    position: relative;
  }


  /* PC 中间时间轴隐藏 */
  .timeline-list-block::after {

    display: none;
  }


  /* =====================================================
     EVENT
  ===================================================== */

  .timeline-list-block
    .event-block,

  .timeline-list-block
    .event-block:nth-child(odd),

  .timeline-list-block
    .event-block:nth-child(even) {

    position: relative;

    display: block;

    width: 100%;

    padding-left: 2rem;
    padding-right: 0;

    margin: 0;
  }


  .timeline-list-block
    .event-block
    .event-content {

    display: block;

    width: 100%;
    max-width: 100%;
  }


  .timeline-list-block
    .event-block
    .event-content
    .content-group {

    width: 100%;
    max-width: 100%;

    box-sizing: border-box;

    padding-top: 3rem;
    padding-bottom: 3rem;
    padding-inline: 0;

    text-align: left;
  }


  .timeline-list-block
    .event-block:nth-child(odd)
    .content-group,

  .timeline-list-block
    .event-block:nth-child(even)
    .content-group {

    text-align: left;
  }


  /* =====================================================
     MOBILE 时间轴
  ===================================================== */

  .timeline-list-block
    .event-block::after {

    content: "";

    display: block;

    position: absolute;

    top: 0;
    bottom: 0;
    left: 0;

    z-index: 0;

    width: 1px;

    background:
      rgba(
        var(--color-foreground),
        0.12
      );
  }


  /* 每个 Event 显示圆点 */
  .timeline-list-block
    .event-block::before,

  .timeline-list-block
    .event-block:nth-child(odd)::before,

  .timeline-list-block
    .event-block:nth-child(even)::before {

    content: "";

    display: block;

    position: absolute;

    top: 3rem;
    left: 0;
    right: auto;

    z-index: 2;

    width: 0.75rem;
    height: 0.75rem;

    border-radius: 50%;

    transform: translateX(-50%);

    background:
      rgba(
        var(--color-foreground),
        1
      );
  }


  /* =====================================================
     MOBILE IMAGE
  ===================================================== */

  .timeline-list-block
    .image-block {

    position: relative;

    width: auto;
    max-width: 100%;

    height: auto;

    margin-left: 0;
    margin-right: auto;

    overflow: visible;
  }


  .timeline-list-block
    .image-block.media--adapt {

    width: auto;
    max-width: 100%;

    height: auto;

    aspect-ratio: auto;
  }


  .timeline-list-block
    .image-block.media--adapt::before {

    display: none;
    content: none;
  }


  .timeline-list-block
    .image-block.media--adapt img {

    position: relative;

    display: block;

    width: auto;
    max-width: 100%;

    height: auto;

    inset: auto;

    margin-left: 0;
    margin-right: auto;

    object-fit: contain;
  }


  /* =====================================================
     MOBILE VIDEO
  ===================================================== */

  .timeline-list-block
    .video-block {

    max-width: 100%;
  }

}