.page-about {
  --ab-gap-lg: clamp(44px, 6vw, 84px);
  --ab-axis: var(--ky-moss);
  padding-top: 22px;
  padding-bottom: clamp(48px, 8vw, 104px);
}

/* ---------- 面包屑 ---------- */
.page-about .ky-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-12);
  letter-spacing: 0.04em;
  color: var(--ky-muted);
}

.page-about .ky-breadcrumb a {
  color: var(--ky-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ky-ease), border-color 0.2s var(--ky-ease);
}

.page-about .ky-breadcrumb a:hover,
.page-about .ky-breadcrumb a:focus-visible {
  color: var(--ky-gold);
  border-bottom-color: var(--ky-gold);
}

.page-about .ky-breadcrumb [aria-current="page"] {
  color: var(--ky-paper);
}

.page-about .ab-crumb-sep {
  color: var(--ky-moss);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  margin-top: clamp(20px, 3vw, 34px);
  padding: clamp(28px, 5vw, 56px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--ky-line);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -10% -6% 0 30%;
  background-image:
    linear-gradient(to right, rgba(76, 107, 92, 0.2) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(76, 107, 92, 0.2) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(120% 88% at 92% 4%, #000 0%, transparent 70%);
  mask-image: radial-gradient(120% 88% at 92% 4%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .ab-hero .ky-eyebrow,
.page-about .ab-hero__title,
.page-about .ab-hero__lead,
.page-about .ab-hero__coords {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  font-family: var(--ky-font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8vw, 6rem);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--ky-paper);
}

.page-about .ab-hero__lead {
  max-width: 62ch;
  margin-top: clamp(18px, 2.4vw, 26px);
  color: var(--ky-muted);
}

.page-about .ab-hero__coords {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: clamp(24px, 3vw, 34px);
  padding-top: 18px;
  border-top: 1px dashed var(--ky-surface-3);
}

.page-about .ab-coord {
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-14);
  color: var(--ky-paper);
  letter-spacing: 0.02em;
}

.page-about .ab-coord em {
  font-style: normal;
  display: block;
  font-size: var(--ky-fs-12);
  letter-spacing: 0.1em;
  color: var(--ky-moss);
  margin-bottom: 4px;
}

/* ---------- 档案骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap-lg);
  margin-top: clamp(34px, 5vw, 60px);
}

.page-about .ab-index__eyebrow {
  color: var(--ky-moss);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 6px;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--ky-surface-3);
  border-radius: var(--ky-r-pill);
  background: var(--ky-surface-1);
  color: var(--ky-muted);
  font-size: var(--ky-fs-14);
  text-decoration: none;
  transition: color 0.2s var(--ky-ease), border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease);
}

.page-about .ab-index__no {
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-12);
  color: var(--ky-moss);
  transition: color 0.2s var(--ky-ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible,
.page-about .ab-index__link[aria-current="true"] {
  color: var(--ky-paper);
  border-color: var(--ky-gold);
  background: var(--ky-surface-2);
}

.page-about .ab-index__link:hover .ab-index__no,
.page-about .ab-index__link:focus-visible .ab-index__no,
.page-about .ab-index__link[aria-current="true"] .ab-index__no {
  color: var(--ky-gold);
}

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

/* ---------- 区块通用 ---------- */
.page-about .ab-block + .ab-block {
  margin-top: clamp(48px, 6vw, 84px);
  padding-top: clamp(40px, 5vw, 64px);
  border-top: 1px solid var(--ky-line);
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-family: var(--ky-font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.8vw, 2.5rem);
  line-height: 1.16;
  color: var(--ky-paper);
}

.page-about .ab-block__intro {
  margin-top: 16px;
  max-width: 60ch;
  color: var(--ky-muted);
}

.page-about .ky-media {
  margin: 0;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-r-lg);
  overflow: hidden;
  background: var(--ky-surface-2);
}

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

/* ---------- 图文双栏 ---------- */
.page-about .ab-two {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
  align-items: start;
}

.page-about .ab-two__text > .ky-body + .ky-body {
  margin-top: 14px;
}

.page-about .ab-two__media {
  border-radius: var(--ky-r-md);
}

@media (min-width: 860px) {
  .page-about .ab-two {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .ab-two--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }

  .page-about .ab-two--reverse .ab-two__text {
    order: 2;
  }

  .page-about .ab-two--reverse .ab-two__media {
    order: 1;
  }
}

/* ---------- 规模数字 ---------- */
.page-about .ab-figures {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ky-line);
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-r-md);
  overflow: hidden;
}

.page-about .ab-figure {
  background: var(--ky-surface-1);
  padding: 22px 20px 24px;
  transition: background 0.2s var(--ky-ease);
}

.page-about .ab-figure:hover {
  background: var(--ky-surface-2);
}

.page-about .ab-figure__num {
  display: block;
  font-family: var(--ky-font-mono);
  font-weight: 700;
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ky-gold);
  white-space: nowrap;
}

.page-about .ab-figure__unit {
  display: block;
  margin-top: 10px;
  font-size: var(--ky-fs-14);
  font-weight: 700;
  color: var(--ky-paper);
}

.page-about .ab-figure__desc {
  margin: 10px 0 0;
  font-size: var(--ky-fs-14);
  line-height: 1.75;
  color: var(--ky-muted);
}

@media (min-width: 720px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 版本时间线 ---------- */
.page-about .ab-media--band {
  margin-top: clamp(20px, 3vw, 30px);
  border-radius: var(--ky-r-md);
  aspect-ratio: 21 / 9;
}

.page-about .ab-media--band img {
  height: 100%;
}

.page-about .ab-timeline {
  list-style: none;
  position: relative;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--ab-axis), var(--ky-line) 72%, transparent);
}

.page-about .ab-node {
  position: relative;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-r-md);
  background: var(--ky-surface-1);
  transition: border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease);
}

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

.page-about .ab-node:hover,
.page-about .ab-node[open] {
  border-color: var(--ky-gold);
  background: var(--ky-surface-2);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ky-surface-2);
  border: 2px solid var(--ab-axis);
  transition: border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease), box-shadow 0.2s var(--ky-ease);
}

.page-about .ab-node:hover::before,
.page-about .ab-node[open]::before {
  border-color: var(--ky-gold);
  background: var(--ky-gold);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.16);
}

.page-about .ab-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--ky-r-md);
}

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

.page-about .ab-node__head::marker {
  content: "";
}

.page-about .ab-node__head:focus-visible {
  outline: 2px solid var(--ky-gold);
  outline-offset: 2px;
}

.page-about .ab-node__ver {
  font-family: var(--ky-font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 5vw, 3.25rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ky-gold);
  flex: 0 0 auto;
}

.page-about .ab-node__title {
  flex: 1 1 12ch;
  min-width: 0;
  font-family: var(--ky-font-sans);
  font-weight: 700;
  font-size: var(--ky-fs-16);
  line-height: 1.5;
  color: var(--ky-paper);
}

.page-about .ab-node__hint {
  flex: 0 0 auto;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-12);
  letter-spacing: 0.08em;
  color: var(--ky-moss);
  transition: color 0.2s var(--ky-ease);
}

.page-about .ab-node:hover .ab-node__hint,
.page-about .ab-node[open] .ab-node__hint {
  color: var(--ky-gold);
}

.page-about .ab-node__body {
  padding: 16px 22px 22px;
  border-top: 1px solid var(--ky-surface-3);
  animation: ab-fade-in 0.18s var(--ky-ease);
}

.page-about .ab-node__cta {
  margin: 16px 0 0;
}

@keyframes ab-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 编辑流程 ---------- */
.page-about .ky-media--tall {
  aspect-ratio: 4 / 5;
}

.page-about .ky-media--tall img {
  height: 100%;
}

.page-about .ab-steps {
  list-style: none;
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-step {
  position: relative;
  padding: 20px 20px 24px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-r-md);
  background: var(--ky-surface-1);
  overflow: hidden;
  transition: border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease);
}

.page-about .ab-step::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ky-gold), rgba(201, 162, 39, 0));
  opacity: 0;
  transition: opacity 0.2s var(--ky-ease);
}

.page-about .ab-step:hover {
  border-color: var(--ky-gold);
  background: var(--ky-surface-2);
}

.page-about .ab-step:hover::after {
  opacity: 1;
}

.page-about .ab-step__no {
  display: block;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-28);
  line-height: 1;
  color: var(--ky-gold);
}

.page-about .ab-step__title {
  margin: 14px 0 0;
  font-family: var(--ky-font-sans);
  font-weight: 700;
  font-size: var(--ky-fs-16);
  color: var(--ky-paper);
}

.page-about .ab-step .ky-body {
  margin-top: 10px;
  font-size: var(--ky-fs-14);
  color: var(--ky-muted);
}

@media (min-width: 760px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 合作共建 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-partners li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid var(--ky-surface-3);
  border-radius: var(--ky-r-sm);
  background: var(--ky-surface-2);
  font-size: var(--ky-fs-14);
  line-height: 1.7;
  color: var(--ky-muted);
  transition: border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease), color 0.2s var(--ky-ease);
}

.page-about .ab-partners li:hover {
  border-color: var(--ky-gold);
  background: var(--ky-surface-3);
  color: var(--ky-paper);
}

.page-about .ab-partners__no {
  flex: 0 0 auto;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-12);
  color: var(--ky-gold);
  letter-spacing: 0.06em;
}

@media (min-width: 680px) {
  .page-about .ab-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-coop {
  margin-top: clamp(24px, 3.4vw, 34px);
  padding: 22px 22px 24px;
  border: 1px solid var(--ky-surface-3);
  border-left: 3px solid var(--ky-vermillion);
  border-radius: var(--ky-r-md);
  background: var(--ky-surface-1);
}

.page-about .ab-coop .ky-body {
  color: var(--ky-muted);
  max-width: 66ch;
}

.page-about .ab-coop__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
}

/* ---------- 服务范围 ---------- */
.page-about .ab-scope {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-scope__panel {
  padding: 22px 20px 24px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-r-md);
  background: var(--ky-surface-1);
}

.page-about .ab-scope__label {
  margin: 0;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-12);
  letter-spacing: 0.1em;
  color: var(--ky-moss);
}

.page-about .ab-scope__value {
  margin: 12px 0 0;
  font-family: var(--ky-font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.2;
  color: var(--ky-paper);
}

.page-about .ab-scope__panel .ky-body {
  margin-top: 12px;
  font-size: var(--ky-fs-14);
  color: var(--ky-muted);
}

@media (min-width: 720px) {
  .page-about .ab-scope {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-legend {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 18px 20px;
  border: 1px dashed var(--ky-surface-3);
  border-radius: var(--ky-r-md);
  display: grid;
  gap: 12px;
}

.page-about .ab-legend li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--ky-font-mono);
  font-size: var(--ky-fs-14);
  color: var(--ky-muted);
  transition: color 0.2s var(--ky-ease);
}

.page-about .ab-legend li:hover {
  color: var(--ky-paper);
}

.page-about .ab-legend__mark {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--ab-axis);
  background: transparent;
  transition: border-color 0.2s var(--ky-ease), background 0.2s var(--ky-ease);
}

.page-about .ab-legend__mark--focus {
  border-color: var(--ky-gold);
  background: var(--ky-gold);
}

.page-about .ab-legend li:hover .ab-legend__mark {
  border-color: var(--ky-gold);
}

.page-about .ab-scope__contact {
  margin-top: clamp(22px, 3vw, 30px);
  color: var(--ky-muted);
  max-width: 66ch;
}

/* ---------- 收尾行动区 ---------- */
.page-about .ab-cta {
  margin-top: clamp(48px, 6vw, 84px);
}

.page-about .ab-cta__inner {
  position: relative;
  padding: clamp(28px, 4.4vw, 48px) clamp(22px, 3.4vw, 44px);
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-r-lg);
  background:
    radial-gradient(120% 160% at 100% 0%, rgba(201, 162, 39, 0.14) 0%, rgba(201, 162, 39, 0) 58%),
    var(--ky-surface-1);
  overflow: hidden;
}

.page-about .ab-cta__title {
  margin: 12px 0 0;
  font-family: var(--ky-font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.2;
  color: var(--ky-paper);
}

.page-about .ab-cta__text {
  margin-top: 14px;
  max-width: 62ch;
  color: var(--ky-muted);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

/* ---------- 桌面端坐标索引 ---------- */
@media (min-width: 1040px) {
  .page-about .ab-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 30px;
    padding-top: 6px;
  }

  .page-about .ab-index__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-about .ab-index__link {
    border-radius: var(--ky-r-sm);
    border-color: transparent;
    background: transparent;
    padding: 10px 12px 10px 14px;
    border-left: 2px solid var(--ky-surface-3);
    border-radius: 0 var(--ky-r-xs) var(--ky-r-xs) 0;
  }

  .page-about .ab-index__link[aria-current="true"] {
    border-left-color: var(--ky-gold);
    background: var(--ky-surface-2);
  }
}

@media (min-width: 1180px) {
  .page-about .ab-node__title {
    font-size: var(--ky-fs-20);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node__body {
    animation: none;
  }

  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>