.page-about {
  --about-rule: rgba(143, 163, 184, .2);
  --about-rule-soft: rgba(143, 163, 184, .1);
  --about-teal-line: rgba(23, 195, 178, .34);
  position: relative;
  background: var(--ink);
  color: var(--text-1);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 26px;
  font-size: 13px;
}

.page-about .about-crumb-sep {
  color: var(--slate);
  opacity: .6;
}

/* ---------- 开篇 ---------- */
.page-about .about-open {
  padding-top: clamp(30px, 6vw, 62px);
  padding-bottom: clamp(32px, 6vw, 68px);
}

.page-about .about-kicker {
  margin: 0 0 16px;
  color: var(--teal);
}

.page-about .about-h1 {
  margin: 0;
  font-size: clamp(40px, 8.6vw, 82px);
  line-height: 1.04;
  letter-spacing: -.03em;
  font-weight: 900;
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 34em;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.85;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(30px, 5vw, 44px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 18px 20px;
  background: var(--ink-2);
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 30px);
  line-height: 1;
  color: var(--teal);
  letter-spacing: -.01em;
}

.page-about .about-fact-label {
  font-size: 13px;
  color: var(--slate);
  letter-spacing: .04em;
}

/* ---------- 主体壳层 ---------- */
.page-about .about-shell {
  padding-bottom: clamp(44px, 8vw, 96px);
}

/* ---------- 章节索引（移动端：横向吸顶胶囊） ---------- */
.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 0 14px;
  margin-bottom: 12px;
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: rgba(11, 26, 43, .94);
  backdrop-filter: blur(8px);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-head {
  display: none;
}

.page-about .index-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 13px;
  border: 1px solid var(--about-rule);
  border-radius: 999px;
  color: var(--slate);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .index-link:hover {
  color: var(--teal-soft);
  border-color: var(--about-teal-line);
}

.page-about .index-link[aria-current="true"] {
  color: var(--ink);
  background: var(--teal);
  border-color: var(--teal);
}

.page-about .index-link .index-no {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: .85;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-top: clamp(42px, 7vw, 86px);
  scroll-margin-top: calc(var(--header-h) + 74px);
}

.page-about .about-sec:first-child {
  padding-top: 0;
}

.page-about .about-sec .chapter-band {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-sec-lede {
  margin: 0;
  max-width: 34em;
  color: var(--text-2);
  font-size: 16.5px;
  line-height: 1.84;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(24px, 4vw, 38px) 0 0;
  border-radius: var(--radius);
  border: 1px solid var(--about-rule);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  background: var(--ink-2);
}

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

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 15, 25, 0) 40%, rgba(6, 15, 25, .86) 100%);
}

.page-about .about-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  margin: 0;
  padding: 16px 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-1);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--teal), var(--violet) 58%, var(--pulse));
  opacity: .55;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 32px 28px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--teal);
  transition: background-color .22s var(--ease), transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--teal);
  transform: scale(1.18);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(26px, 7vw, 40px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--slate);
  transition: color .22s var(--ease);
}

.page-about .tl-item:hover .tl-year {
  color: var(--teal);
}

.page-about .tl-title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--text-1);
}

.page-about .tl-text {
  margin: 10px 0 0;
  max-width: 34em;
  color: var(--text-2);
  font-size: 15.5px;
  line-height: 1.82;
}

.page-about .tl-detail {
  margin: 10px 0 0;
  max-width: 34em;
  padding-left: 12px;
  border-left: 2px solid var(--about-rule);
  color: var(--slate);
  font-size: 13.5px;
  line-height: 1.75;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .tl-item:hover .tl-detail {
  color: var(--teal-soft);
  border-left-color: var(--about-teal-line);
}

/* ---------- 五个内容族群 ---------- */
.page-about .fam {
  list-style: none;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .fam-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 22px 8px 22px 4px;
  border-bottom: 1px solid var(--about-rule);
  transition: background-color .25s var(--ease);
}

.page-about .fam-row:hover {
  background: linear-gradient(90deg, rgba(23, 195, 178, .08), rgba(23, 195, 178, 0) 72%);
}

.page-about .fam-no {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--violet);
  padding-top: 4px;
}

.page-about .fam-name {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .fam-text {
  margin: 9px 0 0;
  max-width: 36em;
  color: var(--text-2);
  font-size: 15.5px;
  line-height: 1.82;
}

.page-about .fam-for {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--teal-soft);
}

/* ---------- 校对流程 ---------- */
.page-about .proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 36px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .proof-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .proof-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 18px 18px 14px;
  background: var(--ink-2);
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--about-teal-line);
  border-radius: var(--radius-sm);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-left-color .24s var(--ease);
}

.page-about .proof-step:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-1);
  border-left-color: var(--pulse);
}

.page-about .proof-step-no {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--violet);
  line-height: 1.5;
}

.page-about .proof-step-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
}

.page-about .proof-step-text {
  margin: 8px 0 0;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .proof-figure {
  margin-top: 0;
  align-self: start;
}

/* ---------- 企业数据对照 ---------- */
.page-about .ent-slice {
  margin-top: clamp(26px, 4vw, 40px);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .ent-slice-label {
  margin: 0;
  padding: 14px 18px;
  border-bottom: 1px solid var(--about-rule);
  color: var(--amber);
  font-family: var(--font-mono);
}

.page-about .ent-scroll {
  padding: 0;
}

.page-about .ent-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .ent-table th,
.page-about .ent-table td {
  padding: 14px 16px;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .ent-table thead th {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--slate);
  background: rgba(6, 15, 25, .55);
  font-weight: 600;
}

.page-about .ent-table tbody tr {
  transition: background-color .2s var(--ease);
}

.page-about .ent-table tbody tr:hover {
  background: rgba(23, 195, 178, .07);
}

.page-about .ent-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .ent-table .col-pin {
  background: var(--ink-2);
  font-weight: 600;
}

.page-about .ent-table td.num,
.page-about .ent-table th.num {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .ent-table .ent-up {
  color: var(--green);
}

.page-about .ent-slice-note {
  margin: 0;
  padding: 12px 18px 14px;
  font-size: 12.5px;
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .ent-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ent-role {
  padding: 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--about-rule);
  background: linear-gradient(160deg, rgba(122, 92, 255, .1), rgba(6, 15, 25, 0) 62%);
}

.page-about .ent-role-name {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--teal-soft);
}

.page-about .ent-role-text {
  margin: 10px 0 0;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .ent-figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 团队与协作 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .team-role {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-sm);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .team-role:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .team-role-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--violet);
  margin-bottom: 12px;
}

.page-about .team-role-name {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .team-role-text {
  margin: 10px 0 0;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .team-partners {
  margin-top: 22px;
  padding: 20px 20px 22px;
  border-left: 3px solid var(--teal);
  background: linear-gradient(90deg, rgba(23, 195, 178, .1), rgba(23, 195, 178, 0) 78%);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .team-partners-text {
  margin: 0;
  max-width: 40em;
  color: var(--text-2);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .team-partners-text a {
  color: var(--teal-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 备案与服务（浅底收尾） ---------- */
.page-about .about-quiet {
  margin-top: clamp(44px, 7vw, 88px);
  padding: clamp(26px, 4vw, 44px);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}

.page-about .chapter-band--light {
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .chapter-band--light .chapter-no {
  color: var(--violet);
}

.page-about .chapter-band--light .chapter-title {
  color: var(--ink);
}

.page-about .svc-list {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(11, 26, 43, .14);
  border: 1px solid rgba(11, 26, 43, .14);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .svc-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 18px;
  background: var(--paper);
}

.page-about .svc-key {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--teal-ink);
  font-weight: 700;
}

.page-about .svc-val {
  margin: 0;
  color: var(--ink);
  font-size: 15.5px;
  line-height: 1.75;
  word-break: break-word;
}

.page-about .svc-val.num {
  font-family: var(--font-mono);
  letter-spacing: -.01em;
}

.page-about .svc-note {
  margin: 20px 0 0;
  color: #33506b;
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .svc-note a {
  color: var(--teal-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next {
  margin-top: clamp(24px, 4vw, 34px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid rgba(11, 26, 43, .16);
}

.page-about .about-next-lede {
  margin: 0 0 14px;
  font-size: 14px;
  letter-spacing: .08em;
  color: #33506b;
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

/* ---------- 桌面：左侧常驻章节索引 + 交错正文 ---------- */
@media (min-width: 1000px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding: 0;
    margin-bottom: 0;
    overflow: visible;
    background: none;
    backdrop-filter: none;
    z-index: auto;
  }

  .page-about .about-rail-head {
    display: block;
    margin: 0 0 10px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--about-rule);
    color: var(--slate);
  }

  .page-about .index-link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0 9px 12px;
    margin-bottom: 2px;
    border: 0;
    border-left: 2px solid var(--about-rule);
    border-radius: 0;
    background: none;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .index-link:hover {
    color: var(--teal-soft);
    border-left-color: var(--about-teal-line);
  }

  .page-about .index-link[aria-current="true"] {
    color: var(--teal);
    background: none;
    border-left-color: var(--teal);
  }

  .page-about .about-sec {
    padding-top: clamp(52px, 6vw, 96px);
  }

  .page-about .tl-item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 0 30px;
    padding-left: 36px;
    padding-bottom: 40px;
  }

  .page-about .tl-year {
    font-size: clamp(34px, 3.4vw, 48px);
    line-height: .95;
  }

  .page-about .proof-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(24px, 3vw, 44px);
  }

  .page-about .proof-figure {
    margin-top: 42px;
  }

  .page-about .fam-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 4px 22px;
    padding: 26px 12px 26px 6px;
  }

  .page-about .ent-figure {
    max-width: 780px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .proof-step,
  .page-about .team-role,
  .page-about .tl-item::before,
  .page-about .tl-year,
  .page-about .tl-detail,
  .page-about .index-link,
  .page-about .fam-row {
    transition: none;
  }

  .page-about .proof-step:hover,
  .page-about .team-role:hover {
    transform: none;
  }

  .page-about .tl-item:hover::before {
    transform: none;
  }
}
<<<END>>>