.page-about {
  --ab-panel: var(--yk-800);
  --ab-line-soft: rgba(44, 66, 114, 0.62);
  background: var(--yk-900);
  color: var(--yk-paper);
  overflow-x: hidden;
}

.page-about .ab-hero {
  position: relative;
  padding: calc(var(--yk-hdr-h) + 28px) 0 clamp(36px, 6vw, 64px);
  border-bottom: 1px solid var(--ab-line-soft);
  overflow: hidden;
}

.page-about .ab-hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(44, 66, 114, 0.30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 66, 114, 0.22) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 88%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 88%);
  pointer-events: none;
}

.page-about .ab-hero__wash {
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(680px, 78vw);
  height: min(680px, 78vw);
  background: radial-gradient(circle at center, rgba(255, 107, 44, 0.20), rgba(255, 107, 44, 0) 68%);
  pointer-events: none;
}

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

.page-about .yk-crumbs {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--yk-mist);
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .yk-crumbs a {
  color: var(--yk-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--yk-ease), border-color 0.24s var(--yk-ease);
}

.page-about .yk-crumbs a:hover,
.page-about .yk-crumbs a:focus-visible {
  color: var(--yk-paper);
  border-bottom-color: var(--yk-orange);
}

.page-about .ab-hero__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-hero__h1 {
  margin: 14px 0 0;
  font-family: var(--yk-font-display);
  font-weight: 900;
  font-size: clamp(36px, 8.2vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--yk-paper);
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--yk-mist);
}

.page-about .ab-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-left: 1px solid var(--yk-line);
  padding-left: 18px;
}

.page-about .ab-hero__vnote {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  margin: 0;
  font-family: var(--yk-font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--yk-mist);
  align-self: flex-start;
}

.page-about .ab-hero__card {
  background: linear-gradient(155deg, var(--yk-800), var(--yk-900));
  border: 1px solid var(--yk-line);
  padding: 22px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-hero__code {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--yk-mint);
  margin-bottom: 12px;
}

.page-about .ab-hero__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--yk-mist);
}

.page-about .ab-hero__mini {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--ab-line-soft);
  display: grid;
  gap: 8px;
}

.page-about .ab-hero__mini li {
  font-size: 13px;
  color: var(--yk-mist);
}

.page-about .ab-hero__mini .yk-mono {
  color: var(--yk-paper);
  margin-right: 6px;
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-facts li {
  background: var(--yk-900);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-facts__n {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--yk-orange);
  letter-spacing: -0.01em;
}

.page-about .ab-facts__l {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--yk-mist);
}

/* 主体骨架 */
.page-about .ab-shell {
  max-width: var(--yk-wrap);
  margin: 0 auto;
  padding: 0 var(--yk-gutter);
}

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

.page-about .ab-flow {
  min-width: 0;
}

.page-about .ab-sec {
  padding: clamp(44px, 6.5vw, 88px) 0;
  border-top: 1px solid var(--ab-line-soft);
  scroll-margin-top: calc(var(--yk-hdr-h) + 24px);
}

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

.page-about .ab-sec__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .ab-sec__idx {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--yk-orange);
  margin: 0;
}

.page-about .ab-sec h2 {
  margin: 0;
  font-family: var(--yk-font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--yk-paper);
}

.page-about .ab-sec__lede {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  max-width: 40em;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.78;
  color: var(--yk-mist);
}

.page-about .ab-prose p {
  margin: 0 0 1.1em;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: var(--yk-mist);
}

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

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

/* 城市卡 */
.page-about .ab-sidecard {
  background: var(--yk-800);
  border: 1px solid var(--yk-line);
  border-left: 3px solid var(--yk-orange);
  padding: 22px 20px;
}

.page-about .ab-sidecard__t {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--yk-paper);
}

.page-about .ab-cities {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .ab-cities li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--yk-paper);
  border-bottom: 1px solid var(--ab-line-soft);
  padding-bottom: 8px;
}

.page-about .ab-cities .yk-mono {
  font-size: 11px;
  color: var(--yk-mint);
  letter-spacing: 0.12em;
}

.page-about .ab-sidecard__n {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--yk-mist);
}

/* 图片 */
.page-about .ab-figure {
  margin: clamp(24px, 3.6vw, 38px) 0 0;
}

.page-about .ab-media {
  border: 1px solid var(--yk-line);
  background: var(--yk-700);
  overflow: hidden;
  line-height: 0;
}

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

.page-about .ab-figure .yk-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.66;
  color: var(--yk-mist);
  letter-spacing: 0.02em;
}

/* 组织关系图 */
.page-about .ab-org {
  margin: clamp(28px, 4vw, 44px) 0 clamp(20px, 3vw, 30px);
  padding: 14px 10px;
  background: var(--yk-800);
  border: 1px solid var(--yk-line);
  overflow-x: auto;
}

.page-about .ab-org__svg {
  display: block;
  width: 100%;
  min-width: 540px;
  height: auto;
}

.page-about .ab-org__core {
  fill: rgba(255, 107, 44, 0.12);
  stroke: var(--yk-orange);
  stroke-width: 1.5;
}

.page-about .ab-org__core-t {
  fill: var(--yk-paper);
  font-size: 15px;
  font-weight: 700;
  text-anchor: middle;
  font-family: var(--yk-font-display);
}

.page-about .ab-org__core-s {
  fill: var(--yk-mint);
  font-size: 11px;
  text-anchor: middle;
  font-family: var(--yk-font-mono);
  letter-spacing: 0.08em;
}

.page-about .ab-org__link {
  fill: none;
  stroke: var(--yk-line);
  stroke-width: 1;
}

.page-about .ab-org__node rect {
  fill: var(--yk-900);
  stroke: var(--yk-line);
  stroke-width: 1;
}

.page-about .ab-org__node text {
  fill: var(--yk-mist);
  font-size: 13px;
  text-anchor: middle;
  font-family: var(--yk-font-body);
}

.page-about .ab-org__node .ab-org__num {
  fill: var(--yk-mint);
  font-size: 12px;
  font-family: var(--yk-font-mono);
}

/* 职能卡片矩阵 */
.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-role {
  background: var(--yk-800);
  padding: 24px 20px;
  position: relative;
  transition: background-color 0.26s var(--yk-ease);
}

.page-about .ab-role::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 2px;
  background: var(--yk-orange);
  transition: width 0.28s var(--yk-ease);
}

.page-about .ab-role:hover::after,
.page-about .ab-role:focus-within::after {
  width: 100%;
}

.page-about .ab-role:hover {
  background: var(--yk-700);
}

.page-about .ab-role__no {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--yk-mist);
}

.page-about .ab-role__t {
  margin: 0 0 12px;
  font-family: var(--yk-font-display);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--yk-paper);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-role__n {
  font-size: 12px;
  font-weight: 400;
  color: var(--yk-mint);
  letter-spacing: 0.08em;
}

.page-about .ab-role p:not(.ab-role__no) {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--yk-mist);
}

/* 时间线 */
.page-about .ab-tl {
  position: relative;
  padding-left: 30px;
  margin-top: 8px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--yk-orange), var(--yk-line) 26%, var(--yk-line) 82%, rgba(44, 66, 114, 0));
}

.page-about .ab-node {
  position: relative;
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 20px;
  width: 9px;
  height: 9px;
  background: var(--yk-900);
  border: 1px solid var(--yk-line);
  transform: rotate(45deg);
  transition: background-color 0.24s var(--yk-ease), border-color 0.24s var(--yk-ease);
}

.page-about .ab-node[open]::before {
  background: var(--yk-orange);
  border-color: var(--yk-orange);
}

.page-about .ab-node__sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-node__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-node__sum:focus-visible {
  outline: 2px solid var(--yk-mint);
  outline-offset: 3px;
}

.page-about .ab-node__year {
  flex: 0 0 auto;
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 700;
  color: var(--yk-paper);
  letter-spacing: -0.01em;
}

.page-about .ab-node[open] .ab-node__year {
  color: var(--yk-mint);
}

.page-about .ab-node__t {
  font-size: clamp(14px, 1.6vw, 16px);
  color: var(--yk-mist);
  line-height: 1.6;
}

.page-about .ab-node__body {
  padding: 0 0 18px 0;
}

.page-about .ab-node__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--yk-mist);
  max-width: 44em;
}

.page-about .ab-figure--wide {
  margin-top: clamp(28px, 4vw, 44px);
}

/* 版本表 */
.page-about .ab-version {
  background: var(--yk-800);
  border: 1px solid var(--yk-line);
  padding: 20px 18px;
}

.page-about .ab-version__head {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.page-about .ab-version__tag {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--yk-mint);
  border-left: 2px solid var(--yk-mint);
  padding-left: 8px;
}

.page-about .ab-table {
  width: 100%;
  font-size: 13.5px;
}

.page-about .ab-table__cap {
  caption-side: top;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yk-mist);
  padding-bottom: 10px;
}

.page-about .ab-table__v {
  color: var(--yk-mint);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-about .ab-version__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--yk-mist);
}

.page-about .ab-version__link {
  margin-top: 14px;
}

/* 合作生态 */
.page-about .ab-net {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  margin-bottom: clamp(24px, 3.6vw, 38px);
}

.page-about .ab-net__card {
  background: var(--yk-800);
  padding: 22px 20px;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-about .ab-net__n {
  margin: 0;
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  color: var(--yk-gold);
  letter-spacing: -0.02em;
  line-height: 1;
}

.page-about .ab-net__t {
  margin: 10px 0 8px;
  font-family: var(--yk-font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--yk-paper);
}

.page-about .ab-net__d {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--yk-mist);
}

.page-about .ab-honor {
  border-top: 1px solid var(--yk-gold);
  padding-top: 18px;
}

.page-about .ab-honor__cap {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--yk-gold);
}

.page-about .ab-honor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-honor__list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  border-bottom: 1px solid var(--ab-line-soft);
  padding-bottom: 12px;
}

.page-about .ab-honor__y {
  font-size: 13px;
  color: var(--yk-gold);
}

.page-about .ab-honor__x {
  font-size: 14px;
  line-height: 1.66;
  color: var(--yk-paper);
}

.page-about .ab-honor__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--yk-mist);
}

/* 联系 */
.page-about .ab-contact {
  font-style: normal;
  background: var(--yk-700);
  border: 1px solid var(--yk-line);
  padding: 22px 20px;
  display: grid;
  gap: 14px;
}

.page-about .ab-contact__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  border-bottom: 1px solid var(--ab-line-soft);
  padding-bottom: 12px;
}

.page-about .ab-contact__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-contact__k {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--yk-mist);
}

.page-about .ab-contact__v {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--yk-paper);
  word-break: break-word;
}

.page-about .ab-contact__v a {
  color: var(--yk-paper);
  text-decoration: none;
  border-bottom: 1px solid var(--yk-line);
  transition: border-color 0.24s var(--yk-ease), color 0.24s var(--yk-ease);
}

.page-about .ab-contact__v a:hover,
.page-about .ab-contact__v a:focus-visible {
  color: var(--yk-orange);
  border-bottom-color: var(--yk-orange);
}

.page-about .ab-cta {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(24px, 3.4vw, 36px) clamp(20px, 3vw, 32px);
  background: linear-gradient(120deg, rgba(255, 107, 44, 0.16), rgba(13, 24, 51, 0.9) 62%);
  border: 1px solid var(--yk-line);
  border-left: 3px solid var(--yk-orange);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .ab-cta__t {
  margin: 0;
  font-family: var(--yk-font-display);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 700;
  line-height: 1.42;
  color: var(--yk-paper);
}

.page-about .ab-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

  .page-about .ab-facts li {
    padding: 22px 18px;
  }

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

  .page-about .ab-roles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-role {
    grid-column: span 3;
  }

  .page-about .ab-role--wide {
    grid-column: span 3;
  }

  .page-about .ab-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__body {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.85fr);
    align-items: start;
  }

  .page-about .ab-hero__aside {
    padding-left: 26px;
  }

  .page-about .ab-split--7-5 {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ab-split--6-6 {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .ab-split--5-7 {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .ab-role {
    grid-column: span 2;
  }

  .page-about .ab-role--wide {
    grid-column: span 3;
  }

  .page-about .ab-role__t {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-shell {
    display: grid;
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 0 clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: calc(var(--yk-hdr-h) + 32px);
    padding: 12px 0 0;
  }

  .page-about .ab-rail__cap {
    margin: 0 0 16px;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--yk-mint);
    border-left: 2px solid var(--yk-mint);
    padding-left: 8px;
  }

  .page-about .ab-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--yk-line);
  }

  .page-about .ab-rail__list li {
    margin: 0;
  }

  .page-about .ab-rail__list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 11px 0 11px 14px;
    margin-left: -1px;
    font-size: 13px;
    color: var(--yk-mist);
    text-decoration: none;
    border-left: 1px solid transparent;
    transition: color 0.24s var(--yk-ease), border-color 0.24s var(--yk-ease);
  }

  .page-about .ab-rail__list a:hover,
  .page-about .ab-rail__list a:focus-visible {
    color: var(--yk-paper);
    border-left-color: var(--yk-orange);
  }

  .page-about .ab-rail__list .yk-mono {
    font-size: 10.5px;
    letter-spacing: 0.1em;
    color: var(--yk-line);
  }

  .page-about .ab-rail__list a:hover .yk-mono,
  .page-about .ab-rail__list a:focus-visible .yk-mono {
    color: var(--yk-orange);
  }

  .page-about .ab-rail__top {
    display: inline-block;
    margin-top: 24px;
    font-family: var(--yk-font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--yk-mist);
    text-decoration: none;
    border-bottom: 1px solid var(--yk-line);
    padding-bottom: 3px;
  }

  .page-about .ab-rail__top:hover,
  .page-about .ab-rail__top:focus-visible {
    color: var(--yk-orange);
    border-bottom-color: var(--yk-orange);
  }

  .page-about .ab-flow {
    border-left: 1px solid var(--ab-line-soft);
    padding-left: clamp(24px, 3vw, 44px);
  }

  .page-about .ab-role {
    grid-column: span 2;
  }

  .page-about .ab-role--wide {
    grid-column: span 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role::after,
  .page-about .ab-role,
  .page-about .ab-node::before,
  .page-about .yk-crumbs a,
  .page-about .ab-contact__v a,
  .page-about .ab-rail__list a {
    transition: none;
  }
}
<<<END>>>