.page-about {
  --about-tint: rgba(6, 11, 22, .72);
  --about-rule: rgba(92, 106, 118, .26);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 2rem 0 3rem;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -45%;
  right: -25%;
  width: 78vw;
  max-width: 720px;
  aspect-ratio: 1;
  background: radial-gradient(circle at center, rgba(33, 230, 208, .12), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(33, 230, 208, .06) 1px, transparent 1px);
  background-size: 100% 52px;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 25%, #000 62%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 25%, #000 62%, transparent);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-size: clamp(34px, 7.4vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 800;
  color: var(--text-strong);
  margin: .8rem 0 1.2rem;
  max-width: 19ch;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  font-size: clamp(15px, 1.75vw, 18px);
  line-height: 1.82;
  color: var(--text);
  margin: 0 0 2.25rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem 1rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--sonar);
}

.page-about .about-hero__stats .stat__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-dim);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: 1rem;
}

.page-about .about-index {
  display: none;
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .flow-section {
  position: relative;
  padding: 3rem 0;
}

.page-about .flow-section + .flow-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: -1.25rem;
  right: -1.25rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-sonar) 12%, var(--line-sonar) 88%, transparent);
  transform: rotate(-.45deg);
  transform-origin: left center;
}

.page-about .flow-section__title {
  font-size: clamp(23px, 3.5vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.022em;
  font-weight: 700;
  color: var(--text-strong);
  margin: .55rem 0 1.1rem;
  max-width: 24ch;
}

.page-about .flow-section .lede {
  font-size: clamp(15px, 1.75vw, 17px);
  line-height: 1.85;
  color: var(--text);
  max-width: 62ch;
  margin: 0 0 1.75rem;
}

/* ---------- 封面图 ---------- */
.page-about .flow-figure {
  margin: 0 0 2rem;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--ink-850);
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.page-about .flow-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 11, 22, .1), rgba(6, 11, 22, .72));
  pointer-events: none;
}

.page-about .flow-figure--skew {
  -webkit-clip-path: polygon(0 3.5%, 100% 0, 100% 96.5%, 0 100%);
  clip-path: polygon(0 3.5%, 100% 0, 100% 96.5%, 0 100%);
}

/* ---------- 覆盖参数标签页 ---------- */
.page-about .coverage-tabs {
  margin-top: .5rem;
}

.page-about .coverage-tabs .seg {
  display: flex;
  flex-wrap: wrap;
  gap: .15rem;
  border-bottom: 1px solid var(--about-rule);
  margin-bottom: 1.25rem;
}

.page-about .coverage-tabs .seg-btn {
  -webkit-appearance: none;
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: .7rem .95rem;
  font-family: inherit;
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--text-dim);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .coverage-tabs .seg-btn:hover {
  color: var(--text-strong);
}

.page-about .coverage-tabs .seg-btn[aria-selected="true"] {
  color: var(--sonar);
  border-bottom-color: var(--sonar);
}

.page-about .coverage-tabs .seg-btn:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-about .coverage-tabs .seg-panel {
  padding-top: .35rem;
}

.page-about .coverage-tabs .seg-panel:focus-visible {
  outline: 2px solid var(--line-sonar);
  outline-offset: 6px;
}

/* ---------- 表格 ---------- */
.page-about .table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .data-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .data-table thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--sonar);
  padding: 0 1rem .7rem 0;
  border-bottom: 1px solid var(--line-sonar);
}

.page-about .data-table tbody td {
  padding: 1rem 1rem 1rem 0;
  border-bottom: 1px solid var(--about-rule);
  color: var(--text);
  line-height: 1.62;
  vertical-align: top;
}

.page-about .data-table tbody td:first-child {
  color: var(--text-strong);
  font-weight: 500;
}

.page-about .data-table tbody tr:hover td {
  background: var(--sonar-06);
}

.page-about .data-table th.is-num,
.page-about .data-table td.is-num {
  text-align: right;
  padding-right: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--text-strong);
  white-space: nowrap;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 1rem;
}

.page-about .about-timeline::before {
  display: none;
}

.page-about .about-timeline li {
  position: relative;
  padding-top: 1rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 30px;
  height: 1px;
  background: var(--sonar);
}

.page-about .about-timeline li:last-child::before {
  background: var(--coral);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--text-strong);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-note {
  display: block;
  margin-top: .3rem;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 校对流程 ---------- */
.page-about .confirm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
  margin-top: .5rem;
}

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

.page-about .confirm-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  filter: saturate(.86) contrast(1.08);
}

.page-about .confirm-figure figcaption {
  margin-top: .85rem;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-mute);
  max-width: 46ch;
}

.page-about .confirm-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .confirm-steps li {
  position: relative;
  padding: 0 0 1.6rem 1.85rem;
}

.page-about .confirm-steps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .3rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sonar);
  box-shadow: 0 0 0 4px rgba(33, 230, 208, .13);
}

.page-about .confirm-steps li::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 1.15rem;
  bottom: 0;
  width: 1px;
  background: var(--about-rule);
}

.page-about .confirm-steps li:last-child {
  padding-bottom: 0;
}

.page-about .confirm-steps li:last-child::after {
  display: none;
}

.page-about .confirm-steps__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--coral);
  margin-bottom: .3rem;
}

.page-about .confirm-steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .confirm-note {
  margin: 2rem 0 0;
  padding: 1.1rem 1.25rem;
  border-left: 2px solid var(--lime);
  background: var(--lime-16);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
  max-width: 66ch;
}

/* ---------- 企业数据视图 ---------- */
.page-about .enterprise-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
  margin-top: .5rem;
}

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

.page-about .detail-row {
  border-top: 1px solid var(--about-rule);
}

.page-about .detail-row:last-of-type {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .detail-row > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: 1.05rem 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--sonar);
  transition: color var(--dur) var(--ease);
}

.page-about .detail-row > summary::-webkit-details-marker {
  display: none;
}

.page-about .detail-row > summary::before {
  content: "+";
  flex: none;
  width: 1.1em;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--coral);
  text-align: center;
}

.page-about .detail-row[open] > summary::before {
  content: "−";
}

.page-about .detail-row > summary:hover,
.page-about .detail-row > summary:focus-visible {
  color: var(--sonar-soft);
}

.page-about .detail-row__body {
  padding: 0 0 1.4rem 1.8rem;
}

.page-about .fact-list {
  margin: 0;
}

.page-about .fact-list dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: .3rem;
}

.page-about .fact-list dd {
  margin: 0 0 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--about-rule);
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .fact-list dd:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

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

.page-about .enterprise-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  filter: saturate(.9) contrast(1.06);
}

/* ---------- 团队 ---------- */
.page-about .team-nodes {
  list-style: none;
  margin: 0 0 2.5rem;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.6rem;
}

.page-about .team-nodes li {
  position: relative;
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .team-nodes li::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 36px;
  height: 1px;
  background: var(--sonar);
}

.page-about .team-nodes__city {
  display: block;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--text-strong);
  margin-bottom: .5rem;
}

.page-about .team-nodes p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .season-nodes {
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line-sonar);
}

.page-about .season-nodes__title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--sonar);
}

.page-about .season-nodes ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
}

.page-about .season-nodes li {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text);
  padding-left: 1rem;
  position: relative;
}

.page-about .season-nodes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 5px;
  height: 5px;
  background: var(--coral);
  border-radius: 50%;
}

.page-about .season-nodes__k {
  display: inline-block;
  margin-right: .5rem;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--text-strong);
}

/* ---------- 接口生态 ---------- */
.page-about .field-list {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .field-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .25rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .field-list__name {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--sonar);
}

.page-about .field-list__desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .partner-note {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  padding-left: 1rem;
  border-left: 1px solid var(--line-sonar);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: 3rem;
  padding: 3.25rem 0;
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink-800), var(--ink-850) 55%, var(--ink-900));
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 0%, rgba(255, 107, 61, .16), transparent 55%),
    radial-gradient(ellipse at 92% 100%, rgba(33, 230, 208, .14), transparent 58%);
  pointer-events: none;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  top: 0;
  left: -5%;
  right: -5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--sonar) 30%, var(--coral) 70%, transparent);
  transform: rotate(-.6deg);
  transform-origin: left center;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-cta__title {
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.022em;
  font-weight: 700;
  color: var(--text-strong);
  margin: .6rem 0 1rem;
  max-width: 22ch;
}

.page-about .about-cta__lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.82;
  color: var(--text);
  margin: 0 0 1.75rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-cta__more {
  margin: 1.5rem 0 0;
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .about-cta__more .link-arrow {
  color: var(--sonar);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 2.75rem 0 3.5rem;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 1rem;
    padding-top: 1rem;
  }

  .page-about .about-timeline::before {
    display: block;
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 9px;
    height: 1px;
    background: linear-gradient(90deg, var(--stone), var(--sonar));
  }

  .page-about .about-timeline li {
    padding-top: 0;
    border-top: 0;
  }

  .page-about .about-timeline li::before {
    top: 3px;
    left: 0;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink-900);
    border: 1.5px solid var(--sonar);
  }

  .page-about .about-timeline li:last-child::before {
    background: var(--coral);
    border-color: var(--coral);
    box-shadow: 0 0 0 4px rgba(255, 107, 61, .18);
  }

  .page-about .field-list li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .fact-list {
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr);
    column-gap: 1.5rem;
  }

  .page-about .fact-list dt {
    padding: .95rem 0;
    margin: 0;
    border-bottom: 1px solid var(--about-rule);
  }

  .page-about .fact-list dd {
    padding: .95rem 0;
    margin: 0;
    border-bottom: 1px solid var(--about-rule);
  }

  .page-about .fact-list dd:last-of-type {
    border-bottom: 1px solid var(--about-rule);
  }

  .page-about .season-nodes ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem 2rem;
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem 1.25rem;
  }
}

@media (min-width: 860px) {
  .page-about .confirm-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .enterprise-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .team-nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.75rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 184px minmax(0, 1fr);
    gap: 3.5rem;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 6rem;
    align-self: start;
    padding-top: 3.2rem;
  }

  .page-about .about-index__list {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-index__list a {
    display: flex;
    align-items: baseline;
    gap: .55rem;
    margin-left: -1px;
    padding: .55rem 0 .55rem 1rem;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-dim);
    text-decoration: none;
    border-left: 1px solid transparent;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    color: var(--sonar);
    border-left-color: var(--sonar);
  }

  .page-about .about-index__no {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .04em;
    color: var(--sonar);
    flex: none;
  }

  .page-about .flow-section {
    padding: 4.5rem 0;
  }

  .page-about .flow-section + .flow-section::before {
    left: -2rem;
    right: -2rem;
  }

  .page-about .about-cta {
    padding: 4.5rem 0;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    padding: 3.5rem 0 4.5rem;
  }

  .page-about .flow-section {
    padding: 5.25rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-figure--skew {
    -webkit-clip-path: none;
    clip-path: none;
  }

  .page-about .flow-section + .flow-section::before,
  .page-about .about-cta::after {
    transform: none;
  }

  .page-about * {
    transition-duration: .01ms !important;
  }
}
<<<END>>>