.page-about {
  --about-rail: 216px;
  --about-gap: 60px;
  --about-stack: 68px;
  --about-ink-soft: rgba(11, 15, 20, .76);
  --about-ink-mid: rgba(11, 15, 20, .58);
  background: var(--ink);
  color: var(--paper-82);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 32px 0 64px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  isolation: isolate;
}

.page-about .about-hero__cut {
  position: absolute;
  top: 4%;
  right: -6%;
  width: 46%;
  height: 88%;
  background: linear-gradient(150deg, var(--blue-wash), transparent 72%);
  clip-path: polygon(20% 0, 100% 0, 80% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__lead,
.page-about .about-hero__aside {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 20px;
}

.page-about .about-hero__title {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 78px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 32em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-64);
}

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

.page-about .about-fact {
  background: var(--ink);
  padding: 18px 16px 16px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--pulse);
  margin-bottom: 10px;
}

.page-about .about-fact__label {
  display: block;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--paper-64);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  padding-top: 64px;
  padding-bottom: 96px;
  align-items: start;
}

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

.page-about .about-rail__label {
  margin: 0 0 14px;
  padding-bottom: 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--stone);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-rail__link {
  display: block;
  padding: 9px 10px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--paper-64);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              padding-left var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--pulse);
  padding-left: 14px;
}

.page-about:has(#scope:target) .about-rail__link[href="#scope"],
.page-about:has(#audience:target) .about-rail__link[href="#audience"],
.page-about:has(#versions:target) .about-rail__link[href="#versions"],
.page-about:has(#team:target) .about-rail__link[href="#team"],
.page-about:has(#heilongjiang:target) .about-rail__link[href="#heilongjiang"],
.page-about:has(#sourcing:target) .about-rail__link[href="#sourcing"],
.page-about:has(#partners:target) .about-rail__link[href="#partners"],
.page-about:has(#handoff:target) .about-rail__link[href="#handoff"] {
  color: var(--paper);
  background: var(--blue-wash);
  border-left-color: var(--pulse);
  padding-left: 14px;
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: var(--about-stack);
  min-width: 0;
}

.page-about .about-block {
  scroll-margin-top: calc(var(--bar-h) + 32px);
}

.page-about .about-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-block__head .idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--pulse);
}

.page-about .about-block__title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-block__lede {
  max-width: 34em;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-64);
}

.page-about .about-p {
  max-width: 34em;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-82);
}

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

.page-about .about-link {
  color: var(--blue-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--blue-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

/* ---------- 反白区块 ---------- */
.page-about .about-block--paper {
  background: var(--paper);
  color: var(--ink);
  padding: 34px 22px 54px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
}

.page-about .about-block--paper .about-block__head {
  border-bottom-color: rgba(11, 15, 20, .18);
}

.page-about .about-block--paper .about-block__head .idx {
  color: var(--clay);
}

.page-about .about-block--paper .about-block__title {
  color: var(--ink);
}

.page-about .about-block--paper .about-block__lede,
.page-about .about-block--paper .about-p {
  color: var(--about-ink-soft);
}

/* ---------- 四类服务 ---------- */
.page-about .about-svc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-svc__item {
  display: flex;
  min-width: 0;
}

.page-about .about-svc__link {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  padding: 24px 22px;
  background: var(--ink-2);
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  color: inherit;
  text-decoration: none;
  transition: transform var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.page-about .about-svc__link:hover,
.page-about .about-svc__link:focus-visible {
  transform: translate(-2px, -2px);
  border-color: var(--blue);
  box-shadow: var(--shadow-blue);
}

.page-about .about-svc__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--blue-soft);
}

.page-about .about-svc__t {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-svc__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-64);
}

.page-about .about-svc__go {
  margin-top: auto;
  padding-top: 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--flame);
}

.page-about .about-svc__go::after {
  content: " →";
}

/* ---------- 服务对象 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-role {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-role:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-role__name {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-64);
}

/* ---------- 版本演进 ---------- */
.page-about .about-figure {
  margin: 0 0 40px;
}

.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line-strong);
}

.page-about .about-figure--square {
  max-width: 420px;
}

.page-about .about-vers {
  position: relative;
}

.page-about .about-vers__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-vers__scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.page-about .about-vers__node {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px 12px;
  background: var(--ink-2);
  border: 2px solid var(--line-strong);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.page-about .about-vers__node:hover {
  border-color: var(--blue-soft);
  transform: translateY(-2px);
}

.page-about .about-vers__v {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--stone);
  transition: color var(--dur) var(--ease);
}

.page-about .about-vers__n {
  font-size: 13px;
  line-height: 1.4;
  color: var(--paper-64);
  transition: color var(--dur) var(--ease);
}

.page-about #about-vers-1:checked ~ .about-vers__scale .about-vers__node[for="about-vers-1"],
.page-about #about-vers-2:checked ~ .about-vers__scale .about-vers__node[for="about-vers-2"],
.page-about #about-vers-3:checked ~ .about-vers__scale .about-vers__node[for="about-vers-3"],
.page-about #about-vers-4:checked ~ .about-vers__scale .about-vers__node[for="about-vers-4"] {
  border-color: var(--pulse);
  background: rgba(184, 255, 60, .08);
}

.page-about #about-vers-1:checked ~ .about-vers__scale .about-vers__node[for="about-vers-1"] .about-vers__v,
.page-about #about-vers-2:checked ~ .about-vers__scale .about-vers__node[for="about-vers-2"] .about-vers__v,
.page-about #about-vers-3:checked ~ .about-vers__scale .about-vers__node[for="about-vers-3"] .about-vers__v,
.page-about #about-vers-4:checked ~ .about-vers__scale .about-vers__node[for="about-vers-4"] .about-vers__v {
  color: var(--pulse);
}

.page-about #about-vers-1:checked ~ .about-vers__scale .about-vers__node[for="about-vers-1"] .about-vers__n,
.page-about #about-vers-2:checked ~ .about-vers__scale .about-vers__node[for="about-vers-2"] .about-vers__n,
.page-about #about-vers-3:checked ~ .about-vers__scale .about-vers__node[for="about-vers-3"] .about-vers__n,
.page-about #about-vers-4:checked ~ .about-vers__scale .about-vers__node[for="about-vers-4"] .about-vers__n {
  color: var(--paper);
}

.page-about .about-vers__radio:focus-visible ~ .about-vers__scale {
  outline: 2px solid var(--pulse);
  outline-offset: 6px;
}

.page-about .about-vers__panel {
  display: none;
  padding: 26px 22px;
  background: var(--ink-2);
  border: 2px solid var(--line-strong);
  border-top: 3px solid var(--pulse);
}

.page-about #about-vers-1:checked ~ .about-vers__panels #about-vers-panel-1,
.page-about #about-vers-2:checked ~ .about-vers__panels #about-vers-panel-2,
.page-about #about-vers-3:checked ~ .about-vers__panels #about-vers-panel-3,
.page-about #about-vers-4:checked ~ .about-vers__panels #about-vers-panel-4 {
  display: block;
}

.page-about .about-vers__pt {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-vers__pd {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-64);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid rgba(11, 15, 20, .16);
}

.page-about .about-team__row:first-child {
  border-top: 1px solid rgba(11, 15, 20, .16);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--clay);
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 黑龙江 ---------- */
.page-about .about-cities {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-city {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--ink-2);
  border: 1px solid var(--line-strong);
  font-size: 14px;
  line-height: 1.4;
  color: var(--paper-82);
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.page-about .about-city:hover {
  border-color: var(--moss);
  background: rgba(94, 122, 82, .22);
  color: var(--paper);
}

.page-about .about-city__s {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--clay);
}

.page-about .about-city--primary {
  border-color: var(--clay);
  background: rgba(180, 102, 74, .18);
  color: var(--paper);
}

/* ---------- 内容来源 ---------- */
.page-about .about-sourcing {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-sourcing__text {
  min-width: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-eco__item {
  padding: 24px 20px;
  background: var(--ink-2);
  border: 2px solid var(--line-strong);
  border-left: 4px solid var(--moss);
}

.page-about .about-eco__figure {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 12px;
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-eco__unit {
  font-size: 13px;
  color: var(--paper-64);
}

.page-about .about-eco__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-eco__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-64);
}

/* ---------- 一起做事 ---------- */
.page-about .about-handoff {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-handoff__main {
  min-width: 0;
}

.page-about .about-handoff__cta {
  margin: 26px 0 0;
}

.page-about .about-contact {
  margin: 0;
  padding: 22px 20px;
  background: rgba(11, 15, 20, .06);
  border: 2px solid rgba(11, 15, 20, .2);
  border-left: 4px solid var(--clay);
}

.page-about .about-contact__row {
  display: grid;
  gap: 4px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(11, 15, 20, .12);
}

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

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

.page-about .about-contact__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--about-ink-mid);
}

.page-about .about-contact__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

/* ---------- 窄屏补丁 ---------- */
@media (max-width: 419px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }

  .page-about .about-team__row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

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

  .page-about .about-role {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 28px;
  }

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

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

  .page-about .about-block--paper {
    padding: 42px 40px 66px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-sourcing {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-handoff {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 76px;
    padding-bottom: 120px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
  }

  .page-about .about-block--paper {
    padding: 48px 52px 74px;
  }

  .page-about .about-block__head {
    gap: 8px 24px;
  }
}

/* ---------- 无障碍偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-svc__link,
  .page-about .about-vers__node,
  .page-about .about-city,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-svc__link:hover,
  .page-about .about-svc__link:focus-visible {
    transform: none;
  }

  .page-about .about-vers__node:hover {
    transform: none;
  }
}
<<<END>>>