/* ============================================================
   幻 · HUAN2022A — 成长时间线模块样式
   深空霓虹 · 手写 CSS · 零外部依赖
   ============================================================ */

#timeline .tl-list { position: relative; }

/* 主干线：竖直渐变发光线 */
#timeline .tl-list::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 34px;
  left: 142px; /* 与节点列（120px + 46px/2）中心对齐 */
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 55%, var(--pink));
  opacity: 0.85;
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.35), 0 0 26px rgba(167, 139, 250, 0.18);
}

/* ---------- 条目：先暗后亮 + 位移 ---------- */
#timeline .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 120px 46px minmax(0, 1fr);
  align-items: start;
  margin-bottom: 34px;
  opacity: 0.16;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22, 0.8, 0.3, 1);
  transition-delay: var(--td, 0ms);
}
#timeline .tl-item:last-child { margin-bottom: 4px; }
#timeline .tl-item.lit { opacity: 1; transform: none; }

/* 年份：mono 大字 + 渐变色 */
#timeline .tl-year {
  grid-column: 1;
  display: flex; flex-direction: column; align-items: flex-end;
  padding: 2px 14px 0 0;
}
#timeline .tl-y {
  font-family: var(--mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
#timeline .tl-m {
  font-family: var(--mono); font-size: 12.5px; color: var(--muted);
  letter-spacing: 1.5px; margin-top: 3px;
}
#timeline .tl-y-ghost {
  background: none;
  color: var(--muted);
  -webkit-text-fill-color: var(--muted);
  font-size: 17px;
  letter-spacing: 2px;
}

/* ---------- 节点圆点：点亮 + 脉冲光圈 ---------- */
#timeline .tl-node-col { grid-column: 2; position: relative; }
#timeline .tl-node {
  position: absolute;
  top: 10px; left: 50%;
  transform: translateX(-50%);
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid rgba(138, 150, 179, 0.55);
  box-shadow: 0 0 0 4px rgba(5, 6, 15, 0.95);
  transition: border-color 0.4s, box-shadow 0.4s;
}
#timeline .tl-item.lit .tl-node {
  border-color: var(--c, var(--cyan));
  box-shadow: 0 0 0 4px rgba(5, 6, 15, 0.95), 0 0 16px var(--c, var(--cyan));
}
#timeline .tl-item.lit .tl-node::after {
  content: "";
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px solid var(--c, var(--cyan));
  animation: tl-pulse 2.4s ease-out infinite;
}
@keyframes tl-pulse {
  0% { transform: scale(0.5); opacity: 0.9; }
  70%, 100% { transform: scale(1.7); opacity: 0; }
}

/* ---------- 右侧卡片 ---------- */
#timeline .tl-card {
  grid-column: 3;
  margin-left: 18px;
  max-width: 640px;
  padding: 15px 20px 14px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.3s;
}
#timeline .tl-card h3 { font-size: 16.5px; font-weight: 700; letter-spacing: 0.3px; }
#timeline .tl-card p { margin-top: 4px; font-size: 13.8px; color: var(--muted); }
@media (hover: hover) {
  #timeline .tl-card:hover {
    transform: translateY(-3px);
    border-color: rgba(0, 229, 255, 0.45);
    box-shadow: 0 16px 38px rgba(0, 0, 0, 0.45), 0 0 22px rgba(0, 229, 255, 0.12);
  }
}

/* ---------- 末尾「未完待续」虚线节点 ---------- */
#timeline .tl-future .tl-node {
  background: transparent;
  border: 1.5px dashed rgba(138, 150, 179, 0.6);
  box-shadow: none;
}
#timeline .tl-future.lit .tl-node {
  border-color: rgba(0, 229, 255, 0.55);
  box-shadow: none;
}
#timeline .tl-future.lit .tl-node::after { animation: none; opacity: 0; }
#timeline .tl-card-future h3 { color: var(--muted); letter-spacing: 3px; }

/* ---------- 响应式：移动端单列，年份在上 ---------- */
@media (max-width: 820px) {
  #timeline .tl-list::before { left: 16px; top: 10px; bottom: 26px; }
  #timeline .tl-item {
    grid-template-columns: 34px minmax(0, 1fr);
    margin-bottom: 26px;
  }
  #timeline .tl-year {
    grid-column: 2; grid-row: 1;
    flex-direction: row; align-items: baseline; gap: 7px;
    padding: 0 0 6px 14px;
  }
  #timeline .tl-y { font-size: 22px; }
  #timeline .tl-m { margin-top: 0; }
  #timeline .tl-node-col { grid-column: 1; grid-row: 1 / 3; }
  #timeline .tl-node { top: 4px; }
  #timeline .tl-card {
    grid-column: 2; grid-row: 2;
    margin: 4px 0 0 14px;
    padding: 13px 16px 12px;
    max-width: none;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  #timeline .tl-item { opacity: 1 !important; transform: none !important; transition: none !important; }
  #timeline .tl-item.lit .tl-node::after { animation: none; opacity: 0; }
  #timeline .tl-node { transition: none; }
  #timeline .tl-card { transition: none; }
}