.page-about {
  background: var(--cream);
  color: var(--char);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 32px) 0 clamp(48px, 6.5vw, 92px);
  background: var(--cream);
}

.page-about .about-hero__wash {
  position: absolute;
  inset: -14% -14% -14% 0;
  background: linear-gradient(150deg, var(--ink-700) 0%, var(--ink-950) 78%);
  clip-path: polygon(58% -14%, 120% -14%, 120% 120%, 34% 120%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .about-hero .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--copper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

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

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

.page-about .figure__frame {
  border-radius: var(--r-card);
  overflow: hidden;
}

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

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .about-hero__copy {
  padding-bottom: 8px;
}

.page-about .about-hero__eyebrow {
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(30px, 4.2vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--cream-soft);
}

.page-about .about-hero__lede {
  margin: 0 0 28px;
  max-width: 40em;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(239, 233, 220, 0.84);
}

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

.page-about .about-hero__actions .btn--ghost {
  color: var(--cream);
  border-color: rgba(239, 233, 220, 0.42);
  background: transparent;
}

.page-about .about-hero__actions .btn--ghost:hover {
  background: rgba(228, 188, 124, 0.16);
}

/* ---------- 规模读数条 ---------- */
.page-about .about-stats {
  background: var(--ink-900);
  padding: clamp(28px, 4vw, 46px) 0;
  border-top: 1px solid rgba(228, 188, 124, 0.28);
}

.page-about .about-stats__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-stats__item {
  border-left: 1px solid rgba(228, 188, 124, 0.3);
  padding-left: 14px;
}

.page-about .about-stats__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 2.9vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--copper-200);
}

.page-about .about-stats__unit {
  font-size: 0.44em;
  margin-left: 5px;
  letter-spacing: 0.04em;
  color: rgba(228, 188, 124, 0.75);
}

.page-about .about-stats__label {
  margin: 9px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(239, 233, 220, 0.66);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  padding: clamp(44px, 6vw, 88px) 0 clamp(52px, 7vw, 96px);
}

.page-about .about-body__split {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

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

.page-about .about-index .index-nav__title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-index .index-nav__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 2px;
}

.page-about .about-index .index-nav__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--copper), var(--ink-500));
  opacity: 0.55;
}

.page-about .about-index .index-nav__link {
  position: relative;
  display: block;
  padding: 9px 0;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

.page-about .about-index .index-nav__link::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--cream);
  border: 1.5px solid var(--ink-500);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-index .index-nav__link:hover,
.page-about .about-index .index-nav__link.is-active {
  color: var(--char);
  font-weight: 600;
}

.page-about .about-index .index-nav__link.is-active::before {
  background: var(--copper);
  border-color: var(--copper);
}

.page-about .about-index .index-nav__meta {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding-left: 22px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(36px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-section__head {
  margin-bottom: 18px;
}

.page-about .about-section__head .eyebrow {
  color: var(--copper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  margin: 0 0 10px;
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--char);
}

.page-about .about-section__lede {
  margin: 0 0 26px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-section__tail {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--copper-200);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 场景清单 ---------- */
.page-about .scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .scope-item {
  background: var(--cream-soft);
  padding: clamp(18px, 2.2vw, 26px);
  display: grid;
  gap: 6px;
  grid-template-columns: 1fr;
  transition: background 200ms var(--ease);
}

.page-about .scope-item:hover {
  background: var(--stone);
}

.page-about .scope-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .scope-item__title {
  margin: 0;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--char);
}

.page-about .scope-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--copper) 0%, var(--ink-500) 55%, rgba(42, 101, 87, 0.08) 100%);
}

.page-about .tl-node {
  position: relative;
  padding: clamp(16px, 2vw, 22px) clamp(18px, 2.2vw, 26px);
  background: var(--cream-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--copper);
  transition: background 200ms var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  border-color: var(--copper);
  background: #f7f1e3;
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before {
  background: var(--copper);
}

.page-about .tl-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .tl-node__title {
  margin: 7px 0 8px;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--char);
}

.page-about .tl-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-body);
}

.page-about .tl-node__more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  margin-top: 0;
  transition: grid-template-rows 240ms var(--ease), opacity 240ms var(--ease), margin-top 240ms var(--ease);
}

.page-about .tl-node__more-inner {
  overflow: hidden;
}

.page-about .tl-node__more-inner p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--copper-200);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tl-node:hover .tl-node__more,
.page-about .tl-node:focus-within .tl-node__more,
.page-about .tl-node:focus .tl-node__more {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 26px;
}

.page-about .team-list {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-item {
  padding-left: 16px;
  border-left: 2px solid var(--copper);
}

.page-about .team-item__title {
  margin: 0 0 6px;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--char);
}

.page-about .team-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-body);
}

.page-about .team-panel {
  background: var(--ink-900);
  border-radius: var(--r-card);
  padding: clamp(22px, 3vw, 34px);
}

.page-about .team-panel__title {
  margin: 0 0 20px;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--copper-200);
  font-family: var(--font-mono);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(239, 233, 220, 0.14);
  border: 1px solid rgba(239, 233, 220, 0.14);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .about-steps .steps__item {
  background: var(--ink-700);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
}

.page-about .about-steps .steps__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-steps .steps__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--cream-soft);
}

.page-about .about-steps__text {
  grid-column: 2;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(239, 233, 220, 0.74);
}

/* ---------- 资质 ---------- */
.page-about .cred-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .cred-item {
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--cream-soft);
  overflow: hidden;
  transition: border-color 200ms var(--ease);
}

.page-about .cred-item[open] {
  border-color: var(--copper);
}

.page-about .cred-item > summary {
  cursor: pointer;
  list-style: none;
  padding: clamp(15px, 1.9vw, 20px) clamp(18px, 2.2vw, 24px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--char);
}

.page-about .cred-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .cred-item > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--copper);
}

.page-about .cred-item[open] > summary::after {
  content: "−";
}

.page-about .cred-item__body {
  padding: 0 clamp(18px, 2.2vw, 24px) clamp(16px, 2vw, 22px);
}

.page-about .cred-item__body p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--copper-200);
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
  margin-bottom: 30px;
}

.page-about .about-partners__copy > p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .partner-item {
  padding: 16px 18px;
  background: var(--cream-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
}

.page-about .partner-item__title {
  margin: 0 0 6px;
  font-size: 15.5px;
  color: var(--char);
}

.page-about .partner-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-body);
}

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

.page-about .partner-flow {
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.page-about .partner-flow__title {
  margin: 0 0 18px;
  font-size: 15px;
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
  color: var(--copper);
}

.page-about .partner-flow__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .partner-flow__step {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  background: var(--stone);
  border-radius: var(--r-sm);
  font-size: 14px;
  color: var(--char);
}

.page-about .partner-flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-700);
}

.page-about .partner-flow__note {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .partner-flow__note a {
  color: var(--ink-700);
  text-decoration: underline;
  text-decoration-color: var(--copper);
  text-underline-offset: 3px;
}

.page-about .partner-flow__note a:hover {
  color: var(--ember);
}

/* ---------- 页尾引导 ---------- */
.page-about .about-cta {
  background: var(--ink-900);
  padding: clamp(44px, 6vw, 80px) 0;
}

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

.page-about .about-cta__inner::before {
  content: "";
  position: absolute;
  right: 0;
  top: -18px;
  width: min(34vw, 260px);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--copper));
}

.page-about .about-cta__title {
  margin: 0 0 16px;
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--cream-soft);
}

.page-about .about-cta__text {
  margin: 0 0 26px;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(239, 233, 220, 0.78);
}

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

.page-about .about-cta__actions .btn--ghost {
  color: var(--cream);
  border-color: rgba(239, 233, 220, 0.42);
  background: transparent;
}

.page-about .about-cta__actions .btn--ghost:hover {
  background: rgba(228, 188, 124, 0.16);
}

.page-about .about-cta__back {
  margin: 24px 0 0;
  font-size: 13px;
}

.page-about .about-cta__back a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 224, 200, 0.4);
  padding-bottom: 2px;
}

.page-about .about-cta__back a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-cta__inner a:focus-visible,
.page-about .about-hero__actions a:focus-visible,
.page-about .about-cta__back a:focus-visible,
.page-about .cred-item > summary:focus-visible,
.page-about .index-nav__link:focus-visible,
.page-about .tl-node:focus-visible,
.page-about .partner-flow__note a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 959px) {
  .page-about .about-hero__wash {
    inset: -6% -6% -6% 0;
    clip-path: polygon(0 40%, 100% 26%, 100% 106%, 0 106%);
  }

  .page-about .about-hero__copy {
    padding-bottom: 24px;
  }
}

@media (min-width: 760px) {
  .page-about .scope-item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 6px 20px;
    align-items: start;
  }

  .page-about .scope-item__no {
    grid-row: 1 / span 2;
    padding-top: 3px;
  }

  .page-about .team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 36px;
  }

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

  .page-about .partner-flow__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
  }

  .page-about .partner-flow__step {
    flex-direction: column;
    gap: 6px;
  }
}

@media (min-width: 860px) {
  .page-about .about-stats__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .about-hero__copy {
    padding-left: clamp(12px, 2vw, 32px);
  }

  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-steps .steps__item {
    grid-template-columns: 1fr;
    align-content: start;
    padding: 20px 16px;
  }

  .page-about .about-steps .steps__num {
    grid-row: auto;
  }

  .page-about .about-steps__text {
    grid-column: 1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__split {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
}

@media (min-width: 1280px) {
  .page-about .about-body__split {
    grid-template-columns: 300px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-node__more,
  .page-about .tl-node::before,
  .page-about .scope-item,
  .page-about .cred-item,
  .page-about .index-nav__link,
  .page-about .index-nav__link::before {
    transition: none;
  }

  .page-about .tl-node__more {
    grid-template-rows: 1fr;
    opacity: 1;
    margin-top: 12px;
  }
}
<<<END>>>