.page-about {
  --about-cut: 26px;
  background: var(--ink-950);
  color: var(--text-dark-bg);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(255, 138, 31, .16), transparent 58%),
    linear-gradient(158deg, var(--ink-950) 0%, var(--ink-900) 56%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line-dark);
  overflow: hidden;
}

.page-about .about-hero__wash {
  position: absolute;
  z-index: -1;
  inset: auto -30% -46% 34%;
  height: 94%;
  background: linear-gradient(126deg, rgba(86, 183, 154, .22), rgba(86, 183, 154, 0) 64%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  padding-block: clamp(72px, 13vw, 122px) clamp(44px, 7vw, 76px);
}

.page-about .about-crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-dark-faint);
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-crumbs a {
  color: var(--text-dark-mute);
  text-decoration: none;
}

.page-about .about-crumbs a:hover {
  color: var(--amber-300);
}

.page-about .about-crumbs span[aria-hidden] {
  margin: 0 8px;
  opacity: .5;
}

.page-about .about-hero__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--celadon-500);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 8.6vw, 76px);
  line-height: 1.08;
  letter-spacing: .02em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  color: var(--paper-100);
}

.page-about .about-hero__title b {
  display: block;
  font-weight: 900;
  letter-spacing: .05em;
  color: var(--amber-500);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--text-dark-mute);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(32px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--ink-950);
}

.page-about .about-hero__facts strong {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 600;
  line-height: 1;
  color: var(--amber-500);
}

.page-about .about-hero__facts span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dark-faint);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  padding-block: clamp(40px, 6vw, 72px) clamp(56px, 8vw, 96px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
}

.page-about .about-rail__title {
  display: none;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--text-dark-faint);
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 2px solid var(--line-dark-soft);
  color: var(--text-dark-mute);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dark-faint);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper-100);
  border-bottom-color: var(--amber-300);
}

.page-about .about-rail__link[data-active="true"] {
  color: var(--paper-100);
  border-bottom-color: var(--amber-500);
  background: rgba(255, 138, 31, .1);
}

.page-about .about-rail__link[data-active="true"] .about-rail__num {
  color: var(--amber-500);
}

.page-about .about-chapters {
  display: flex;
  flex-direction: column;
  gap: clamp(26px, 3.4vw, 42px);
  min-width: 0;
}

/* ---------- 章节基底 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(24px, 4vw, 40px) clamp(20px, 3.4vw, 36px) clamp(28px, 4vw, 44px);
  border-left: 3px solid var(--amber-500);
  overflow: hidden;
}

.page-about .about-chapter::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 54px;
  height: 54px;
  background: linear-gradient(225deg, var(--amber-500) 0 50%, transparent 50%);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-chapter--ink {
  background: var(--ink-900);
}

.page-about .about-chapter--deep {
  background: var(--ink-800);
  border-left-color: var(--celadon-500);
}

.page-about .about-chapter--deep::after {
  background: linear-gradient(225deg, var(--celadon-500) 0 50%, transparent 50%);
  opacity: .4;
}

.page-about .about-chapter--paper {
  background: var(--paper-200);
  color: var(--text-paper);
  border-left-color: var(--ink-800);
}

.page-about .about-chapter--paper::after {
  background: linear-gradient(225deg, var(--ink-800) 0 50%, transparent 50%);
  opacity: .22;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 14px;
  align-items: start;
  margin-bottom: clamp(16px, 2.6vw, 24px);
}

.page-about .about-chapter__num {
  grid-row: 1 / span 2;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--amber-500);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(25px, 4.6vw, 40px);
  line-height: 1.18;
  letter-spacing: .03em;
  color: var(--paper-100);
}

.page-about .about-chapter__title b {
  font-weight: 900;
  letter-spacing: .05em;
}

.page-about .about-chapter--paper .about-chapter__title {
  color: var(--black-900);
}

.page-about .about-chapter__sub {
  margin: 3px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-dark-faint);
}

.page-about .about-chapter--paper .about-chapter__sub {
  color: var(--text-paper-mute);
}

.page-about .about-lead {
  max-width: 60ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--text-dark-mute);
}

.page-about .about-chapter--paper .about-lead {
  color: var(--text-paper-mute);
}

/* ---------- 正文与图文分栏 ---------- */
.page-about .about-prose {
  max-width: 60ch;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-dark-mute);
}

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

.page-about .about-chapter--paper .about-prose p {
  color: var(--text-paper-mute);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 34px);
  align-items: start;
}

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

.page-about .about-figure .figure__frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-dark);
}

.page-about .about-chapter--paper .about-figure .figure__frame {
  border-color: var(--line-paper);
}

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

.page-about .about-figure .figure__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-dark-faint);
}

.page-about .about-chapter--paper .about-figure .figure__cap {
  color: var(--text-paper-mute);
}

.page-about .about-figure--wide {
  margin-top: clamp(22px, 3.4vw, 32px);
}

/* ---------- 四步骤 ---------- */
.page-about .about-path {
  display: block;
  width: 100%;
  height: auto;
  max-width: 620px;
  margin: 0 0 clamp(18px, 3vw, 26px);
}

.page-about .about-path__line {
  fill: none;
  stroke: var(--amber-500);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-path__node {
  fill: var(--paper-100);
  stroke: var(--ink-800);
  stroke-width: 2.5;
}

.page-about .about-path__node--last {
  fill: var(--celadon-500);
  stroke: var(--celadon-500);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  counter-reset: step;
}

.page-about .about-step {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--paper-100);
  border: 1px solid var(--line-paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-step__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--amber-500);
  margin-bottom: 6px;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--black-900);
}

.page-about .about-step__lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-paper-mute);
}

/* ---------- 折叠细则 ---------- */
.page-about .about-fold {
  margin-top: 12px;
  border-top: 1px dashed var(--line-paper);
}

.page-about .about-fold .fold__summary {
  padding: 9px 0 4px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--ink-600);
}

.page-about .about-fold .fold__summary::-webkit-details-marker,
.page-about .about-fold .fold__summary::marker {
  display: none;
  content: "";
}

.page-about .about-fold .fold__summary::after {
  content: "+";
  float: right;
  font-weight: 600;
  color: var(--amber-500);
}

.page-about .about-fold[open] .fold__summary::after {
  content: "−";
}

.page-about .about-fold .fold__body p {
  margin: 4px 0 2px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-paper-mute);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber-500) 0%, var(--celadon-500) 100%);
  opacity: .75;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 30px) 34px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--amber-500);
  background: var(--ink-800);
  transition: background .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--celadon-500);
  border-color: var(--celadon-500);
  transform: scale(1.25);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--paper-100);
  margin-bottom: 4px;
  transition: color .22s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-within .about-timeline__year {
  color: var(--amber-300);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--paper-100);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dark-mute);
}

/* ---------- 岗位面板 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: 20px 20px 18px;
  background: var(--paper-100);
  border-top: 3px solid var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-role:nth-child(2n) {
  border-top-color: var(--celadon-500);
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .05em;
  color: var(--black-900);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-paper-mute);
}

/* ---------- 档案统计与表格 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  margin-bottom: clamp(22px, 3.4vw, 32px);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 20px;
  background: var(--ink-950);
}

.page-about .about-stat strong {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
  color: var(--amber-500);
}

.page-about .about-stat__unit {
  font-size: 16px;
  margin-left: 2px;
  color: var(--amber-300);
}

.page-about .about-stat span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dark-mute);
}

.page-about .about-table-wrap {
  overflow-x: auto;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.page-about .about-table__cap {
  caption-side: top;
  text-align: left;
  padding: 12px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--text-dark-faint);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px 16px 14px 0;
  vertical-align: top;
  border-bottom: 1px solid var(--line-dark-soft);
  line-height: 1.75;
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--celadon-500);
  border-bottom-color: var(--line-dark);
  padding-bottom: 10px;
}

.page-about .about-table tbody th {
  font-weight: 500;
  color: var(--paper-100);
  white-space: nowrap;
}

.page-about .about-table td {
  color: var(--text-dark-mute);
}

.page-about .about-table a {
  color: var(--amber-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 92, .4);
}

.page-about .about-table a:hover {
  color: var(--amber-500);
  border-bottom-color: var(--amber-500);
}

.page-about .about-note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dark-faint);
}

.page-about .about-note a {
  color: var(--amber-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 92, .4);
}

.page-about .about-note--paper {
  color: var(--text-paper-mute);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

/* ---------- 服务与联系方式 ---------- */
.page-about .about-split--rev {
  align-items: start;
}

.page-about .about-contact {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-contact li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-paper);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-contact span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--ink-600);
  padding-top: 3px;
}

.page-about .about-contact a {
  color: var(--black-900);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-500);
  word-break: break-all;
}

.page-about .about-contact a:hover {
  color: var(--amber-500);
}

.page-about .about-contact em {
  font-style: normal;
  color: var(--text-paper-mute);
}

/* ---------- 继续阅读 ---------- */
.page-about .about-next {
  padding-top: clamp(6px, 1.4vw, 12px);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--text-dark-faint);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 3px 12px;
  padding: 16px 18px;
  background: var(--ink-900);
  border-left: 2px solid var(--ink-600);
  text-decoration: none;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink-800);
  border-left-color: var(--amber-500);
}

.page-about .about-next__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--celadon-500);
  padding-top: 3px;
}

.page-about .about-next__link strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--paper-100);
}

.page-about .about-next__link span:last-child {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dark-mute);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: clamp(28px, 3.6vw, 44px);
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .about-split--rev .about-figure {
    order: 0;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 18px;
  }

  .page-about .about-role:nth-child(even) {
    transform: translateY(26px);
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(36px, 4.4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    display: flex;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line-dark-soft);
  }

  .page-about .about-rail__title {
    display: block;
    padding-left: 12px;
  }

  .page-about .about-rail__link {
    align-items: center;
    white-space: normal;
    padding: 10px 12px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    line-height: 1.45;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--amber-300);
  }

  .page-about .about-rail__link[data-active="true"] {
    border-left-color: var(--amber-500);
  }

  .page-about .about-roles {
    gap: 20px 26px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__year,
  .page-about .about-rail__link,
  .page-about .about-next__link,
  .page-about .about-timeline__item {
    transition: none;
  }

  .page-about .about-timeline__item:hover::before,
  .page-about .about-timeline__item:focus-within::before {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>