.page-about {
  --about-rail: 88px;
  --about-block-gap: 76px;
}

/* ============ 页头 ============ */
.page-about .about-head {
  padding-bottom: 32px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 56px;
}

.page-about .about-lede {
  max-width: 720px;
  margin: 20px 0 0;
  color: var(--ink);
  font-size: clamp(16px, 1.55vw, 18px);
  line-height: 1.8;
}

.page-about .about-head .page-head-meta {
  margin-top: 16px;
  color: var(--muted);
  letter-spacing: .04em;
}

/* ============ 时序主轴 ============ */
.page-about .about-spine {
  position: relative;
  padding-left: var(--about-rail);
}

.page-about .about-spine::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) * 0.5);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent 0,
    var(--rule) 3%,
    var(--rule) 97%,
    transparent 100%
  );
}

.page-about .about-texture {
  position: absolute;
  top: -36px;
  left: 0;
  width: 100%;
  max-width: 560px;
  height: auto;
  opacity: .13;
  pointer-events: none;
  z-index: 0;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 76%);
}

/* ============ 沿轴内容块 ============ */
.page-about .about-block {
  position: relative;
  z-index: 1;
  padding-bottom: var(--about-block-gap);
}

.page-about .about-block:last-of-type {
  padding-bottom: 0;
}

.page-about .about-block::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) * -0.5 - 4px);
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--bg);
  border: 1px solid var(--neon);
  border-radius: 1px;
}

.page-about .about-block-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 30px;
}

.page-about .about-num {
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--neon);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-aside {
  margin-left: auto;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .about-body {
  width: 100%;
}

.page-about #timeline .about-body { max-width: 780px; }
.page-about #system .about-body { max-width: 900px; }
.page-about #team .about-body { max-width: 860px; }
.page-about #honor .about-body { max-width: 760px; }
.page-about #eco .about-body { max-width: 880px; }

.page-about .about-body > .about-lede {
  margin: 0 0 30px;
  max-width: 660px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ============ 沿革时间轴 ============ */
.page-about .tl-list {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--rule);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 28px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--card);
  border: 1px solid var(--amber);
  border-radius: 1px;
}

.page-about .tl-era {
  display: block;
  margin-bottom: 7px;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .tl-text {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ============ 体系条目 ============ */
.page-about .feat-list {
  list-style: none;
  margin: 0 0 36px;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .feat-item {
  position: relative;
  padding: 22px 0 22px 24px;
  border-bottom: 1px solid var(--rule);
}

.page-about .feat-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 31px;
  width: 12px;
  height: 1px;
  background: var(--neon);
}

.page-about .feat-title {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .feat-item p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ============ 图表 ============ */
.page-about .about-fig {
  margin: 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-figcap {
  margin-top: 13px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--muted);
}

/* ============ 团队分工 ============ */
.page-about .team-grid {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-item {
  background: var(--panel);
  padding: 24px 20px 26px;
  transition: opacity 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .team-grid:hover .team-item {
  opacity: .42;
}

.page-about .team-grid .team-item:hover {
  opacity: 1;
  background: var(--card);
}

.page-about .team-idx {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--mint);
}

.page-about .team-name {
  margin: 0 0 9px;
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .team-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-note {
  margin: 0 0 34px;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--mint);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.8;
}

/* ============ 荣誉书签 ============ */
.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .honor-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 20px 20px 16px;
  border-top: 1px solid var(--rule);
  background: linear-gradient(100deg, rgba(242, 193, 78, .07), transparent 46%);
}

.page-about .honor-flag {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 34px;
  background: var(--amber);
  color: #060A12;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  border-radius: 1px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 76%, 0 100%);
}

.page-about .honor-title {
  margin: 0 0 7px;
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .honor-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 合作生态 ============ */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 24px;
}

.page-about .eco-card {
  position: relative;
  padding: 26px 22px 28px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .eco-card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--neon);
  opacity: .45;
}

.page-about .eco-num {
  display: block;
  font-family: var(--f-mono);
  font-size: clamp(34px, 4.6vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .eco-title {
  margin: 12px 0 10px;
  font-family: var(--f-display);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .eco-note {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 收尾 ============ */
.page-about .about-tail {
  margin-top: 68px;
  padding-top: 30px;
  border-top: 1px solid var(--rule);
}

.page-about .about-tail .path-strip {
  margin-top: 26px;
}

/* ============ 平板 ============ */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ============ 手机 ============ */
@media (max-width: 767px) {
  .page-about {
    --about-rail: 40px;
    --about-block-gap: 56px;
  }

  .page-about .about-head {
    margin-bottom: 40px;
    padding-bottom: 26px;
  }

  .page-about .about-head .about-lede {
    font-size: 15.5px;
    line-height: 1.78;
  }

  .page-about .about-spine {
    padding-left: var(--about-rail);
  }

  .page-about .about-texture {
    max-width: 100%;
    opacity: .1;
  }

  .page-about .about-title {
    font-size: 20px;
  }

  .page-about .about-aside {
    margin-left: 0;
    width: 100%;
  }

  .page-about .about-block-head {
    margin-bottom: 22px;
  }

  .page-about .tl-list {
    padding-left: 22px;
  }

  .page-about .tl-item {
    padding-bottom: 24px;
  }

  .page-about .tl-item::before {
    left: -22px;
  }

  .page-about .feat-item {
    padding: 18px 0 18px 20px;
  }

  .page-about .feat-item::before {
    top: 27px;
    width: 10px;
  }

  .page-about .team-item {
    padding: 20px 16px 22px;
  }

  .page-about .honor-item {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 14px;
    padding: 18px 14px 18px 12px;
  }

  .page-about .honor-flag {
    width: 34px;
    height: 30px;
    font-size: 12px;
  }

  .page-about .eco-card {
    padding: 22px 18px 24px;
  }

  .page-about .about-tail {
    margin-top: 48px;
    padding-top: 24px;
  }
}