.page-about {
  position: relative;
  width: 100%;
  --pa-surface: var(--silver-100);
  --pa-panel: #FFFFFF;
  --pa-ink: var(--ink-900);
  --pa-ink-soft: var(--ink-500);
  --pa-line: var(--line-300);
  --pa-grid: rgba(14, 19, 41, 0.045);
  --pa-shadow: 0 1px 0 rgba(255, 255, 255, 0.7), 0 22px 44px -34px rgba(7, 11, 30, 0.55);
  background-color: var(--pa-surface);
  background-image:
    linear-gradient(var(--pa-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--pa-grid) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--pa-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 480px;
  background:
    radial-gradient(120% 85% at 80% 0%, rgba(69, 224, 200, 0.16), transparent 62%),
    radial-gradient(95% 70% at 8% 0%, rgba(243, 199, 120, 0.18), transparent 60%);
  pointer-events: none;
}

.page-about .pa-shell {
  position: relative;
  z-index: 1;
  width: min(var(--shell), 100% - 40px);
  margin-inline: auto;
}

@media (max-width: 560px) {
  .page-about .pa-shell {
    width: calc(100% - 32px);
  }
}

/* ---------- 面包屑 ---------- */
.page-about .pa-crumb {
  padding-top: 32px;
}

.page-about .pa-crumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--pa-ink-soft);
}

.page-about .pa-crumb li + li::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--gold-400);
  vertical-align: middle;
}

.page-about .pa-crumb a {
  color: var(--pa-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .pa-crumb a:hover,
.page-about .pa-crumb a:focus-visible {
  color: var(--pa-ink);
  border-bottom-color: var(--aurora-500);
}

/* ---------- 首屏 ---------- */
.page-about .pa-hero {
  padding: 40px 0 64px;
}

.page-about .pa-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 960px) {
  .page-about .pa-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
  }
}

.page-about .pa-kicker {
  margin: 0 0 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--pa-ink-soft);
}

.page-about .pa-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold-400);
  flex: none;
}

.page-about .pa-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.1rem, 5.6vw, 3.5rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--pa-ink);
}

.page-about .pa-hero__lead {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--pa-ink);
}

.page-about .pa-hero__lead--sub {
  color: var(--pa-ink-soft);
  font-size: 16px;
}

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

.page-about .pa-hero__figure {
  margin: 0;
}

.page-about .pa-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--pa-line);
  box-shadow: 0 34px 66px -46px rgba(7, 11, 30, 0.9);
}

/* ---------- 按钮 ---------- */
.page-about .pa-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border: 1px solid transparent;
  background: var(--aurora-500);
  color: var(--void-900);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .pa-btn:hover,
.page-about .pa-btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px -20px rgba(7, 11, 30, 0.8);
}

.page-about .pa-btn--line {
  background: transparent;
  color: var(--pa-ink);
  border-color: var(--pa-ink);
}

.page-about .pa-btn--line:hover,
.page-about .pa-btn--line:focus-visible {
  border-color: var(--orbit-600);
  color: var(--orbit-600);
}

.page-about .pa-btn--ghost {
  background: transparent;
  color: var(--silver-100);
  border-color: rgba(199, 207, 228, 0.42);
}

.page-about .pa-btn--ghost:hover,
.page-about .pa-btn--ghost:focus-visible {
  border-color: var(--aurora-500);
  color: var(--aurora-500);
}

/* ---------- 首屏数字 ---------- */
.page-about .pa-facts {
  list-style: none;
  margin: 46px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

@media (min-width: 720px) {
  .page-about .pa-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .pa-facts__item {
  min-width: 0;
  padding: 20px 16px 22px;
  background: var(--pa-surface);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .pa-facts__num {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 1.95rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--pa-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .pa-facts__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--pa-ink-soft);
}

/* ---------- 主体布局 ---------- */
.page-about .pa-body {
  padding-bottom: 96px;
}

.page-about .pa-layout {
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 1000px) {
  .page-about .pa-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 56px;
  }
}

.page-about .pa-col {
  min-width: 0;
}

/* ---------- 左侧轨道 ---------- */
.page-about .pa-track {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .pa-track {
    display: block;
    position: sticky;
    top: calc(var(--status-h) + 28px);
    align-self: start;
  }
}

.page-about .pa-track__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .pa-track__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-400), var(--orbit-600) 48%, var(--pa-line));
}

.page-about .pa-track__item {
  position: relative;
  padding-left: 26px;
  margin-bottom: 22px;
}

.page-about .pa-track__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--orbit-600);
  border-radius: 50%;
  background: var(--pa-surface);
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .pa-track__link {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--pa-ink-soft);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .pa-track__link:hover,
.page-about .pa-track__link:focus-visible {
  color: var(--pa-ink);
}

.page-about .pa-track__item:hover::before {
  background: var(--aurora-500);
  border-color: var(--aurora-500);
}

/* ---------- 区块通用 ---------- */
.page-about .pa-sec {
  padding: 52px 0;
  border-top: 1px solid var(--pa-line);
  scroll-margin-top: 88px;
}

.page-about .pa-col > .pa-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .pa-sec__eyebrow {
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--pa-ink-soft);
}

.page-about .pa-sec__eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold-400);
  flex: none;
}

.page-about .pa-h2 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--pa-ink);
}

.page-about .pa-p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--pa-ink);
}

.page-about .pa-note {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold-400);
  font-size: 13px;
  line-height: 1.75;
  color: var(--pa-ink-soft);
}

/* ---------- 三类家庭 ---------- */
.page-about .pa-families {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

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

.page-about .pa-family {
  min-width: 0;
  padding: 24px 20px 26px;
  background: var(--pa-panel);
  border: 1px solid var(--pa-line);
  box-shadow: var(--pa-shadow);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .pa-family:hover {
  border-color: var(--orbit-600);
  transform: translateY(-3px);
}

.page-about .pa-family__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--pa-ink);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--pa-line);
}

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

.page-about .pa-family__need {
  margin: 0;
  flex: 1;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-ink);
}

.page-about .pa-family__start {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--pa-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--orbit-600);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .pa-stages {
  margin-top: 34px;
}

.page-about .pa-stage {
  position: relative;
  padding-left: 30px;
  padding-bottom: 34px;
}

.page-about .pa-stage:last-child {
  padding-bottom: 0;
}

.page-about .pa-stage::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  border: 2px solid var(--gold-400);
  border-radius: 50%;
  background: var(--pa-surface);
}

.page-about .pa-stage::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 22px;
  bottom: 2px;
  width: 1px;
  background: var(--pa-line);
}

.page-about .pa-stage:last-child::after {
  display: none;
}

.page-about .pa-stage__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--pa-ink);
}

.page-about .pa-stage__p {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--pa-ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .pa-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 30px;
}

@media (min-width: 900px) {
  .page-about .pa-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .pa-team__figure {
  margin: 0;
}

.page-about .pa-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--pa-line);
  box-shadow: var(--pa-shadow);
}

.page-about .pa-roles {
  margin-top: 34px;
  border-top: 1px solid var(--pa-line);
}

.page-about .pa-role {
  border: 1px solid var(--pa-line);
  border-top: 0;
  background: var(--pa-panel);
}

.page-about .pa-role > summary {
  position: relative;
  padding: 17px 52px 17px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--pa-ink);
  transition: background 0.2s var(--ease);
}

.page-about .pa-role > summary::-webkit-details-marker {
  display: none;
}

.page-about .pa-role > summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  line-height: 1;
  color: var(--orbit-600);
}

.page-about .pa-role[open] > summary::after {
  content: "\2212";
}

.page-about .pa-role > summary:hover {
  background: rgba(69, 224, 200, 0.07);
}

.page-about .pa-role > summary:focus-visible {
  outline: 2px solid var(--aurora-500);
  outline-offset: -2px;
}

.page-about .pa-role__body {
  padding: 0 18px 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--pa-ink-soft);
}

/* ---------- 准入规则 ---------- */
.page-about .pa-rules {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

@media (min-width: 760px) {
  .page-about .pa-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .pa-rule {
  min-width: 0;
  padding: 24px 22px;
  background: var(--pa-panel);
}

.page-about .pa-rule__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--pa-ink);
}

.page-about .pa-rule__p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--pa-ink-soft);
}

/* ---------- 认证 ---------- */
.page-about .pa-trust {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 30px;
}

@media (min-width: 900px) {
  .page-about .pa-trust {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 44px;
    align-items: start;
  }
}

.page-about .pa-cred {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

.page-about .pa-cred__item {
  padding: 20px 20px 22px;
  background: var(--pa-panel);
}

.page-about .pa-cred__name {
  margin: 0 0 10px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.55;
  color: var(--pa-ink);
}

.page-about .pa-cred__name::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  margin-top: 8px;
  background: var(--gold-400);
  transform: rotate(45deg);
}

.page-about .pa-cred__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--pa-ink-soft);
}

.page-about .pa-trust__figure {
  margin: 0;
}

.page-about .pa-trust__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--pa-line);
  box-shadow: var(--pa-shadow);
}

.page-about .pa-trust__caption {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--gold-400);
  font-size: 13px;
  line-height: 1.75;
  color: var(--pa-ink-soft);
}

/* ---------- 三条做法 ---------- */
.page-about .pa-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--pa-line);
  border: 1px solid var(--pa-line);
}

@media (min-width: 820px) {
  .page-about .pa-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .pa-principle {
  min-width: 0;
  padding: 26px 22px 28px;
  background: rgba(255, 255, 255, 0.72);
}

.page-about .pa-principle__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gold-400);
  font-variant-numeric: tabular-nums;
}

.page-about .pa-principle__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--pa-ink);
}

.page-about .pa-principle__p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--pa-ink-soft);
}

/* ---------- 结尾行动块 ---------- */
.page-about .pa-cta {
  position: relative;
  overflow: hidden;
  margin-top: 36px;
  padding: 38px 26px 40px;
  background: var(--void-900);
  color: var(--silver-100);
}

@media (min-width: 760px) {
  .page-about .pa-cta {
    padding: 46px 42px 48px;
  }
}

.page-about .pa-cta::before {
  content: "";
  position: absolute;
  right: -90px;
  top: -110px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(69, 224, 200, 0.3), transparent 70%);
  pointer-events: none;
}

.page-about .pa-cta::after {
  content: "";
  position: absolute;
  left: -70px;
  bottom: -130px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(243, 199, 120, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .pa-cta__text {
  position: relative;
  z-index: 1;
  max-width: 46em;
}

.page-about .pa-cta__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.38;
  letter-spacing: 0.02em;
  color: var(--silver-100);
}

.page-about .pa-cta__p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(237, 241, 250, 0.82);
}

.page-about .pa-cta__actions {
  position: relative;
  z-index: 1;
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .pa-cta__link {
  font-size: 14px;
  color: var(--aurora-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(69, 224, 200, 0.5);
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease);
}

.page-about .pa-cta__link:hover,
.page-about .pa-cta__link:focus-visible {
  border-bottom-color: var(--aurora-500);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .pa-btn,
  .page-about .pa-family,
  .page-about .pa-track__item::before,
  .page-about .pa-cta__link {
    transition: none;
  }

  .page-about .pa-btn:hover,
  .page-about .pa-btn:focus-visible,
  .page-about .pa-family:hover {
    transform: none;
  }
}
<<<END>>>