body {
  background-color: rgba(0, 0, 0, 1);
  min-height: 100vh;
  overflow-x: hidden;
}

.star-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
}

.container {
  width: 100vw;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.info {
  position: relative;
  width: 100vw;
  height: 30vh;
  margin-top: 10vh;
  color: rgba(255, 255, 255, 1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin-bottom: 10rem;
}

.light {
  width: 100vw;
  height: 50vh;
  position: absolute;
  top: -12rem;
  left: 50%;
  transform: translateX(-50%);
  background-image: url("../../assets/images/ChronologyOfStellarTrails/light.svg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.info .title {
  font-size: 9.6rem;
  font-family: fys, sans-serif;
  animation: tracking-in-expand 0.8s cubic-bezier(0.215, 0.610, 0.355, 1.000) both;
}

.info .intro {
  margin-top: 2rem;
  font-size: 3.2rem;
  font-family: fys, sans-serif;
  animation: tracking-in-expand 0.8s cubic-bezier(0.215, 0.610, 0.355, 1.000) both;
}

/* 时间轴样式 */
.cards {
  position: relative;
  width: 85%;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  overflow: visible;
}

/* 中轴线 */
.cards::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.1));
  transform: translateX(-50%);
  z-index: 1;
}

/* 卡片样式 */
.card {
  position: relative;
  width: 100%;
  min-height: 64.7rem;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
  z-index: 10;
  overflow: visible;
}

.card.visible {
  opacity: 1;
  transform: translateY(0);
}

.card .left {
  width: 65.067rem;
  position: relative;
}

/* 奇数卡片在左侧 */
.card:nth-child(odd) .left {
  align-self: flex-start;
  margin-right: auto;
  z-index: 100;
}

/* 偶数卡片在右侧 */
.card:nth-child(even) .left {
  align-self: flex-end;
  margin-left: auto;
}

.card .left .card-image {
  width: 65.067rem;
  height: 36.6rem;
  object-fit: contain;
  object-position: center;
  border-radius: 0.3rem;
  box-shadow: 0 0 2rem rgba(255, 255, 255, 0.5),
    inset 0 0 2rem rgba(255, 255, 255, 0.5);
}

.card .left .card-content {
  width: 65.067rem;
  padding: 1.5rem;
  color: white;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible;
  font-family: fys, sans-serif;
  transform: translateY(-10%);
  /* 首航缩进 */
  text-indent: 2em;
}

.card .left .card-year {
  font-size: 8.5rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
  font-family: fys, sans-serif;
  opacity: 0;
  transition: all 0.8s ease;
}

.card .left .card-year.visible {
  opacity: 1;
  transform: translateX(5rem) translateY(-2rem) scale(1.2);
}

.card .left .card-description {
  font-size: 2.4rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.card .left .detail-btn {
  background-image: url("../../assets/images/ChronologyOfStellarTrails/button-bg.svg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  width: 18.5rem;
  height: 5.6rem;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2.4rem;
  font-family: fys, sans-serif;
  color: rgba(255, 255, 255, 1);
  position: relative;
  z-index: 1000;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  background-color: transparent;
  flex-shrink: 0;
  box-sizing: border-box;
}

.card .left .detail-btn:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.card:nth-child(odd) .detail-btn {
  align-self: flex-end;
  z-index: 999999;
  margin-right: 0;
  position: relative;
}

.card:nth-child(even) .detail-btn {
  align-self: flex-start;
  z-index: 1000;
  margin-left: 0;
  position: relative;
}

.card .left .detail-btn svg {
  width: 3.2rem;
  height: 3.2rem;
  z-index: 1000;
}

.card:nth-child(even) .detail-btn svg {
  transform: rotate(180deg);
  z-index: 1000;
}

.card .left .detail-btn.visible {
  opacity: 1;
  transform: translateY(0);
}

.bar {
  position: absolute;
  width: 0.3rem;
  height: 5.5rem;
  border-radius: 100%;
  background: rgba(255, 255, 255, 1);
  z-index: 10;
  box-shadow: 0 0 1rem rgba(255, 255, 255, 0.9), 0 0 2rem rgba(255, 255, 255, 0.8), 0 0 4rem rgba(255, 255, 255, 0.7);
}

.card:nth-child(odd) .bar {
  top: 18.3rem;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
}

.card:nth-child(even) .bar {
  top: 18.3rem;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
}

.card-title {
  position: absolute;
  top: 25%;
  font-size: 3.2rem;
  font-family: fys, sans-serif;
  color: rgba(255, 255, 255, 1);
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
  opacity: 0;
  transform: translateY(-50%);
  transition: opacity 0.5s ease, transform 0.5s ease;
  white-space: nowrap;
  z-index: 1;
  pointer-events: none;
}

.card:nth-child(odd) .card-title {
  left: 55%;
}

.card:nth-child(even) .card-title {
  right: 55%;
}

.card.visible .card-title {
  opacity: 1;
  transform: translateY(0);
}