.page-about {
  --about-rail: 44px;
  --about-axis-left: 11px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 4vw, 38px);
  padding-bottom: clamp(24px, 5vw, 52px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 46px);
  align-items: start;
  margin-top: clamp(16px, 3vw, 28px);
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 6.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__copy .lede {
  margin: 18px 0 0;
  max-width: 62ch;
}

.page-about .about-hero__copy .chip-row {
  margin-top: 20px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .about-hero__visual {
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--card), var(--bg-2));
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 300px;
  object-fit: cover;
}

/* ---------- 关键数字 ---------- */
.page-about .about-figures {
  padding-top: clamp(10px, 2vw, 20px);
  padding-bottom: clamp(20px, 4vw, 44px);
}

.page-about .about-figures__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-figure-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 3vw, 26px);
  background: var(--card);
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-figure__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  margin-bottom: clamp(28px, 5vw, 54px);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc__link:hover {
  color: var(--ink);
  border-color: var(--cyan);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--bg);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 纵向主轴 ---------- */
.page-about .about-track {
  position: relative;
  padding-left: var(--about-rail);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: var(--about-axis-left);
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 229, 199, .38) 42%, rgba(0, 229, 199, .05) 100%);
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(44px, 8vw, 92px);
}

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

.page-about .about-node__dot {
  position: absolute;
  left: -42px;
  top: 5px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--bg);
  z-index: 1;
}

.page-about .about-node__dot::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 229, 199, .55);
}

.page-about .about-node__idx {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-node__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(23px, 3.4vw, 33px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-node__body p {
  margin: 0 0 14px;
  max-width: 68ch;
  color: var(--ink);
}

.page-about .about-node__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-node__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, .35);
}

.page-about .about-node__body a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 团队环形图与职责 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
  align-items: center;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-ring {
  display: block;
  width: 100%;
  max-width: 230px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-ring__num {
  fill: var(--ink);
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
}

.page-about .about-ring__unit {
  fill: var(--muted);
  font-family: var(--font-text);
  font-size: 10px;
  letter-spacing: .12em;
}

.page-about .about-duties {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-duty {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 10px;
  row-gap: 5px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  transition: border-color .2s var(--ease);
}

.page-about .about-duty:hover {
  border-color: var(--cyan);
}

.page-about .about-duty__swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--muted);
}

.page-about .about-duty:nth-child(1) .about-duty__swatch { background: var(--cyan); }
.page-about .about-duty:nth-child(2) .about-duty__swatch { background: var(--cyan-soft); }
.page-about .about-duty:nth-child(3) .about-duty__swatch { background: var(--gold); }
.page-about .about-duty:nth-child(4) .about-duty__swatch { background: var(--muted); }

.page-about .about-duty__name {
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-duty__count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
}

.page-about .about-duty__desc {
  grid-column: 2 / -1;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 数据校验流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  transition: border-color .2s var(--ease);
}

.page-about .about-flow__step:hover {
  border-color: var(--cyan);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  border-radius: 16px 16px 0 0;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 229, 199, 0));
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 指标清单 ---------- */
.page-about .about-metrics-box {
  margin-top: clamp(18px, 3vw, 28px);
  padding: clamp(16px, 3vw, 22px);
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 229, 199, .08), rgba(19, 43, 69, .9));
}

.page-about .about-metrics-box__head {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-metrics-box__head h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-metrics li {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--ink);
  background: rgba(10, 26, 47, .55);
}

.page-about .about-metrics-box__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 媒体图 ---------- */
.page-about .about-media {
  margin: clamp(20px, 3.4vw, 32px) 0 0;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--card), var(--bg-2));
}

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

/* ---------- 版本阶段 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(15px, 2.4vw, 21px);
  border-left: 3px solid var(--line);
  border-radius: 0 16px 16px 0;
  background: linear-gradient(90deg, rgba(19, 43, 69, .95), rgba(19, 43, 69, .35));
}

.page-about .about-version__tag {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-version h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-version p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-version--latest {
  border-left-color: var(--orange);
  background: linear-gradient(90deg, rgba(255, 107, 53, .12), rgba(19, 43, 69, .35));
}

.page-about .about-version--latest .about-version__tag {
  color: var(--orange);
}

/* ---------- 内容栏目 ---------- */
.page-about .about-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-column-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
  transition: border-color .2s var(--ease);
}

.page-about .about-column-card:hover {
  border-color: var(--cyan);
}

.page-about .about-column-card__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-column-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-column-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-column-card__link {
  margin-top: auto;
  padding-top: 8px;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-column-card__link:hover {
  color: var(--cyan-soft);
}

/* ---------- 规模数字 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 24px);
  margin-top: clamp(20px, 3.4vw, 32px);
}

.page-about .about-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.8vw, 44px);
  line-height: 1.05;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-outro {
  padding-top: clamp(20px, 4vw, 40px);
}

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: linear-gradient(135deg, rgba(0, 229, 199, .12), rgba(255, 107, 53, .07));
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-figures__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-version {
    grid-template-columns: 118px minmax(0, 1fr);
    align-items: start;
    column-gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
  }

  .page-about .about-hero__visual img {
    max-height: none;
    min-height: 320px;
  }

  .page-about .about-track {
    padding-left: 0;
  }

  .page-about .about-track::before {
    left: 210px;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: 44px;
    align-items: start;
  }

  .page-about .about-node__dot {
    left: 201px;
    top: 7px;
  }

  .page-about .about-node__idx {
    margin: 0;
    padding-top: 6px;
    text-align: right;
  }

  .page-about .about-team {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .page-about .about-ring {
    margin: 0;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -20px;
    width: 20px;
    height: 1px;
    background: var(--line);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    flex-wrap: nowrap;
  }
}

@media (min-width: 1180px) {
  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-duty,
  .page-about .about-flow__step,
  .page-about .about-column-card {
    transition: none;
  }
}
<<<END>>>