/* Experience 时间线样式升级 - 增强视觉层次与动态 */

.tl {
  position: relative;
  border-top: 1px solid var(--paper-line);
  padding: 12px 0;
}

/* 金线进度 */
.tl::before, .tl::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 2px;
}

.tl::before {
  background: var(--paper-line);
}

.tl::after {
  background: linear-gradient(to bottom, var(--gold-deep) 0%, var(--gold-deep) var(--tlp, 0%), transparent var(--tlp, 0%));
}

.tl-item {
  position: relative;
  border-bottom: 1px solid var(--paper-line);
  z-index: 1;
}

.tl-head {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) 40px;
  gap: 12px 24px;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 26px 0;
  min-height: 44px;
  transition: background .25s;
}

.tl-head:hover {
  background: rgba(32, 38, 44, .025);
}

.tl-period {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--text-dark-2);
  display: flex;
  align-items: center;
  gap: 12px;
}

.tl-period::before {
  content: "";
  width: 10px;
  height: 10px;
  border: 2px solid var(--text-dark-2);
  border-radius: 50%;
  background: var(--paper);
  transition: background .3s var(--ease), border-color .3s, transform .3s var(--ease);
  flex: none;
  box-shadow: 0 0 0 0 rgba(143, 90, 28, 0);
}

.tl-item:hover .tl-period::before,
.tl-item.is-open .tl-period::before {
  background: var(--gold-deep);
  border-color: var(--gold-deep);
  transform: scale(1.15);
}

.tl-item.lit .tl-period::before {
  background: var(--gold-deep);
  border-color: var(--gold-deep);
  box-shadow: 0 0 0 4px rgba(143, 90, 28, .15);
}

.tl-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.3;
  transition: color .2s;
}

.tl-item:hover .tl-title {
  color: var(--gold-deep);
}

.tl-org {
  font-size: 14px;
  color: var(--text-dark-2);
  margin-top: 2px;
}

.tl-toggle {
  justify-self: end;
  position: relative;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--paper-line);
  transition: border-color .25s, background .25s, transform .2s var(--ease);
}

.tl-toggle:hover {
  border-color: var(--gold-deep);
  background: rgba(143, 90, 28, .05);
  transform: scale(1.08);
}

.tl-toggle::before, .tl-toggle::after {
  content: "";
  position: absolute;
  left: 7px;
  right: 7px;
  top: 50%;
  height: 2px;
  background: currentColor;
  transform: translateY(-50%);
  transition: transform .3s var(--ease), opacity .3s;
}

.tl-toggle::after {
  transform: translateY(-50%) rotate(90deg);
}

.tl-item.is-open .tl-toggle::after {
  transform: translateY(-50%) rotate(0);
  opacity: 0;
}

.tl-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .4s var(--ease);
}

.tl-item.is-open .tl-body {
  grid-template-rows: 1fr;
}

.reduce-motion .tl-body {
  transition: none;
}

.tl-body > div {
  overflow: hidden;
}

.tl-body-in {
  padding: 0 0 32px 204px;
  animation: tl-content-in .45s var(--ease) both;
}

@keyframes tl-content-in {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.reduce-motion .tl-body-in {
  animation: none;
}

.tl-sum {
  color: var(--text-dark-2);
  max-width: 62ch;
  line-height: 1.7;
}

.tl-detail {
  margin-top: 14px;
  max-width: 62ch;
  line-height: 1.7;
}

.tl-rel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--text-dark-2);
}

.tl-rel button {
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid var(--paper-line);
  border-radius: 17px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--text-dark);
  transition: border-color .25s, color .25s, background .25s, transform .15s;
}

.tl-rel button:hover {
  border-color: var(--gold-deep);
  color: var(--gold-deep);
  background: rgba(143, 90, 28, .06);
  transform: translateY(-1px);
}

.tl-rel button:active {
  transform: translateY(0);
}

/* 响应式 */
@media (max-width: 960px) {
  .tl-body-in {
    padding-left: 0;
  }

  .tl-head {
    grid-template-columns: 1fr 40px;
  }

  .tl-period {
    grid-column: 1 / -1;
  }
}