.page-about {
  --about-line: var(--stone-light);
  --about-rail-w: 190px;
  --about-dim: #C9D6D0;
  background: var(--paper);
  color: var(--ink-deep);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  padding: 22px 0 6px;
}

/* ---------- 开场 ---------- */
.page-about .about-opener {
  padding: 10px 0 56px;
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  max-width: 16ch;
}

.page-about .about-lede {
  margin: 24px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.95;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin: 36px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink-deep);
  margin-right: 4px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 主栅格 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 28px;
  padding-bottom: 56px;
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 左侧时间线索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .about-rail-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail-list li {
  flex: 0 0 auto;
}

.page-about .about-rail-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--about-line);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink-deep);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-rail-list a:hover {
  border-color: var(--amber);
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-rail-list a[aria-current]:not([aria-current="false"]) {
  border-color: var(--amber);
  background: var(--paper-soft);
  font-weight: 600;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-bottom: 60px;
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 10px 0 18px;
  max-width: 18ch;
}

.page-about .about-sec p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.95;
  max-width: 40em;
}

.page-about .about-top {
  margin: 4px 0 0;
  text-align: right;
}

.page-about .about-top .text-link {
  font-size: 14px;
}

/* ---------- 阶段时间线 ---------- */
.page-about .stage-list {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .stage-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 26px;
  width: 1px;
  background: var(--about-line);
}

.page-about .stage {
  position: relative;
  padding: 0 0 28px 30px;
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .stage:last-child::before {
  background: var(--paper);
  border: 2px solid var(--amber);
  box-sizing: border-box;
}

.page-about .stage-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .stage h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  margin: 4px 0 6px;
}

.page-about .stage p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  max-width: 40em;
}

/* ---------- 三块数据 ---------- */
.page-about .line-grid {
  display: grid;
  gap: 1px;
  margin: 26px 0 28px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .line-cell {
  background: var(--paper-soft);
  padding: 24px 20px 20px;
}

.page-about .line-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .line-cell h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 10px;
}

.page-about .line-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-moss);
}

.page-about .lines-figure {
  margin: 0 0 26px;
}

.page-about .lines-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 32px;
}

.page-about .team-text {
  min-width: 0;
}

.page-about .team-bar {
  display: flex;
  height: 46px;
  margin: 24px 0 10px;
  border-radius: 3px;
  overflow: hidden;
  background: var(--stone-light);
}

.page-about .team-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cool-white);
  font-variant-numeric: tabular-nums;
  transition: filter 180ms var(--ease);
}

.page-about .team-seg--edit {
  flex: 7 1 0;
  background: var(--moss);
}

.page-about .team-seg--check {
  flex: 9 1 0;
  background: var(--ink-moss);
}

.page-about .team-seg--tech {
  flex: 6 1 0;
  background: var(--navy);
}

.page-about .team-seg:hover,
.page-about .team-seg:focus-visible {
  filter: brightness(1.2);
}

.page-about .team-legend {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .team-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-top: 8px;
}

.page-about .team-dot--edit {
  background: var(--moss);
}

.page-about .team-dot--check {
  background: var(--ink-moss);
}

.page-about .team-dot--tech {
  background: var(--navy);
}

.page-about .team-legend h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  margin: 0 0 4px;
}

.page-about .team-legend p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-moss);
  max-width: 40em;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 深色入库面板 ---------- */
.page-about .about-pipe {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  color: var(--cool-white);
  padding: 52px 20px 58px;
  margin: 0 0 60px;
  border-radius: 3px;
}

.page-about .about-pipe h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 10px 0 16px;
  max-width: 20ch;
  color: var(--cool-white);
}

.page-about .about-pipe > p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.9;
  max-width: 40em;
  color: var(--about-dim);
}

.page-about .pipe-path {
  display: none;
}

.page-about .pipe-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
  position: relative;
  z-index: 1;
}

.page-about .pipe-step {
  position: relative;
  padding-top: 18px;
  border-top: 2px solid rgba(242, 246, 244, 0.22);
}

.page-about .pipe-step::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
}

.page-about .pipe-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 6px;
}

.page-about .pipe-step h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 6px;
  color: var(--cool-white);
}

.page-about .pipe-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-dim);
}

.page-about .pipe-times {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  position: relative;
  z-index: 1;
}

.page-about .pipe-times li {
  border-left: 2px solid var(--amber);
  padding: 2px 0 2px 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .pipe-times .mono {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  margin-bottom: 4px;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

/* ---------- 合作 ---------- */
.page-about .about-quote {
  margin: 28px 0;
  padding: 6px 0 6px 20px;
  border-left: 4px solid var(--moss);
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  line-height: 1.9;
  letter-spacing: -0.01em;
  max-width: 32em;
  color: var(--ink-deep);
}

.page-about .partners-figure {
  margin: 28px 0 0;
}

.page-about .partners-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--paper-soft);
  border-top: 1px solid var(--about-line);
  padding: 48px 0 56px;
  margin-bottom: 24px;
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 10px 0 16px;
  max-width: 20ch;
}

.page-about .about-cta p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.95;
  max-width: 38em;
}

.page-about .about-cta .btn {
  margin-top: 6px;
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 26px 0 0;
  font-size: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-lede {
    font-size: 17px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .line-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-pipe {
    padding: 60px 40px 66px;
  }

  .page-about .pipe-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 28px;
  }

  .page-about .pipe-times {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-pipe {
    padding: 68px 56px 76px;
  }

  .page-about .pipe-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .pipe-step:nth-child(2),
  .page-about .pipe-step:nth-child(4) {
    transform: translateY(18px);
  }

  .page-about .pipe-path {
    display: block;
    position: absolute;
    right: -30px;
    top: 34px;
    width: 460px;
    height: 160px;
    color: var(--amber);
    opacity: 0.3;
    pointer-events: none;
  }
}

@media (min-width: 1000px) {
  .page-about .about-flow {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail-inner {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 16px;
    bottom: 16px;
    width: 1px;
    background: var(--about-line);
  }

  .page-about .about-rail-list li {
    flex: none;
    width: 100%;
  }

  .page-about .about-rail-list a {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 11px 0 11px 24px;
    position: relative;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .about-rail-list a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--paper);
    border: 1px solid var(--stone);
    box-sizing: border-box;
    transition: background 180ms var(--ease), border-color 180ms var(--ease);
  }

  .page-about .about-rail-list a:hover {
    border-color: transparent;
  }

  .page-about .about-rail-list a:hover::before {
    border-color: var(--amber);
  }

  .page-about .about-rail-list a[aria-current]:not([aria-current="false"]) {
    background: transparent;
  }

  .page-about .about-rail-list a[aria-current]:not([aria-current="false"])::before {
    background: var(--amber);
    border-color: var(--amber);
  }

  .page-about .about-sec {
    padding-bottom: 72px;
  }
}
<<<END>>>