.page-about {
  --about-line: rgba(201, 209, 227, 0.16);
  --about-line-ink: rgba(17, 24, 38, 0.14);
  --about-body: rgba(201, 209, 227, 0.86);
  --about-body-ink: rgba(17, 24, 38, 0.78);
  --about-gap: clamp(24px, 4vw, 56px);
  background: var(--indigo-950);
  color: var(--porcelain);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(120px, 15vw, 190px) 0 clamp(44px, 6vw, 80px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(87, 214, 178, 0.16), transparent 62%),
    radial-gradient(90% 70% at 0% 18%, rgba(255, 107, 44, 0.14), transparent 58%),
    var(--indigo-950);
  border-bottom: 1px solid var(--about-line);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.4vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--porcelain);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.12rem);
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-stats li {
  display: grid;
  gap: 6px;
  padding: 20px 18px;
  background: var(--indigo-850);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.2vw, 2.1rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--celadon);
}

.page-about .about-stats__label {
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-chapters {
  position: relative;
  z-index: 2;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--indigo-850);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-chapters ul {
  display: flex;
  gap: 8px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px var(--gutter);
  list-style: none;
}

.page-about .about-chapters a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-chapters a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--celadon);
}

.page-about .about-chapters a:hover,
.page-about .about-chapters a:focus-visible {
  border-color: var(--celadon);
  color: var(--porcelain);
  background: rgba(87, 214, 178, 0.12);
  outline: none;
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(52px, 8vw, 104px) 0;
  border-bottom: 1px solid var(--about-line);
  scroll-margin-top: 96px;
}

.page-about .about-section--deep {
  background: var(--indigo-950);
  color: var(--porcelain);
}

.page-about .about-section--paper {
  background: var(--porcelain);
  color: var(--ink);
  border-bottom-color: var(--about-line-ink);
}

.page-about .about-section--last {
  border-bottom: none;
}

.page-about .about-section h2 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 24ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.2vw, 2.7rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
}

.page-about .about-section p {
  margin: 0 0 1em;
  font-size: clamp(0.96rem, 1.6vw, 1.04rem);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-section--paper p {
  color: var(--about-body-ink);
}

.page-about .about-section__lead {
  max-width: 58ch;
  margin-bottom: clamp(26px, 4vw, 40px) !important;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-section--paper .about-kicker {
  color: var(--celadon-deep);
}

.page-about .about-num {
  color: var(--signal);
  font-weight: 700;
}

.page-about .about-subhead {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-split--tight {
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px dashed var(--about-line-ink);
}

.page-about .about-media {
  position: relative;
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--indigo-850);
}

.page-about .about-section--paper .about-media {
  border-color: var(--about-line-ink);
  background: #E9EBE2;
}

.page-about .about-media img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-media .media__caption {
  padding: 12px 18px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist);
  background: var(--indigo-850);
}

.page-about .about-section--paper .about-media .media__caption {
  color: var(--ink);
  background: #DDE1D6;
}

/* ---------- 事实小索引 ---------- */
.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-s);
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--signal);
}

/* ---------- 三道流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(34px, 5vw, 56px);
}

.page-about .about-flow__item {
  position: relative;
  padding: 26px 22px 22px;
  border: 1px solid var(--about-line-ink);
  border-top: 3px solid var(--indigo-700);
  border-radius: var(--radius-m);
  background: rgba(255, 255, 255, 0.62);
}

.page-about .about-flow__item--done {
  border-top-color: var(--celadon-deep);
  background: rgba(87, 214, 178, 0.14);
}

.page-about .about-flow__step {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--celadon-deep);
}

.page-about .about-flow__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--about-body-ink);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 16px;
}

.page-about .about-team__card {
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius-l);
  border: 1px solid var(--about-line);
}

.page-about .about-team__card--a {
  background: var(--indigo-700);
}

.page-about .about-team__card--b {
  background: var(--indigo-850);
}

.page-about .about-team__card--c {
  background: var(--celadon);
  color: var(--ink);
  border-color: transparent;
}

.page-about .about-team__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .about-team__card--c .about-team__num {
  color: var(--indigo-950);
}

.page-about .about-team__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-team__card--c p {
  color: rgba(11, 21, 51, 0.82);
}

/* ---------- 年表 ---------- */
.page-about .about-timeline {
  margin: 0;
  padding: 0 0 0 clamp(14px, 2.5vw, 24px);
  list-style: none;
  border-left: 1px solid var(--about-line-ink);
}

.page-about .about-timeline > li {
  position: relative;
}

.page-about .about-timeline > li + li {
  border-top: 1px solid var(--about-line-ink);
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(14px, 2.5vw, 24px) - 5px);
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
}

.page-about .about-entry summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-entry summary::-webkit-details-marker {
  display: none;
}

.page-about .about-entry summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

.page-about .about-entry__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .about-entry__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-body-ink);
}

.page-about .about-entry__title {
  flex: 1 1 12ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  color: var(--ink);
}

.page-about .about-entry__toggle {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-left: auto;
}

.page-about .about-entry__toggle::before,
.page-about .about-entry__toggle::after {
  content: "";
  position: absolute;
  background: var(--celadon-deep);
  border-radius: 1px;
}

.page-about .about-entry__toggle::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-about .about-entry__toggle::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-entry[open] .about-entry__toggle::after {
  transform: scaleY(0);
}

.page-about .about-entry__body {
  padding: 0 0 22px;
  max-width: 62ch;
}

.page-about .about-entry__body p {
  margin: 0;
  font-size: 0.96rem;
}

/* ---------- 覆盖数字 ---------- */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--about-line);
}

.page-about .about-figures li {
  display: grid;
  gap: 6px;
  padding: 18px 14px;
  background: var(--indigo-850);
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.6vw, 1.8rem);
  font-weight: 700;
  color: var(--celadon);
}

.page-about .about-figures__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  margin-bottom: clamp(30px, 4vw, 46px);
}

.page-about .about-partners__card {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-m);
  border: 1px solid var(--about-line-ink);
}

.page-about .about-partners__card h3 {
  margin: 14px 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: 0.95rem;
}

.page-about .about-feature {
  padding-top: clamp(24px, 3.5vw, 38px);
  border-top: 1px dashed var(--about-line-ink);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding: clamp(26px, 4vw, 46px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 107, 44, 0.18), transparent 58%),
    var(--indigo-850);
}

.page-about .about-cta__body p {
  max-width: 54ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-cta__label {
  margin: 0 0 12px !important;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--celadon) !important;
}

.page-about .about-links {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-links a {
  display: inline-block;
  padding-left: 16px;
  position: relative;
  font-size: 0.95rem;
  color: var(--porcelain);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 7px;
  height: 1px;
  background: var(--signal);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--celadon);
  border-bottom-color: var(--celadon);
  outline: none;
}

.page-about .about-cta__note {
  margin: 0 !important;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist) !important;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-team__card--a {
    grid-column: 1 / -1;
  }
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-split--flip .about-media {
    order: -1;
  }

  .page-about .about-team {
    grid-template-columns: 1.32fr 1fr 1fr;
    align-items: start;
  }

  .page-about .about-team__card--a {
    grid-column: auto;
    margin-top: 0;
  }

  .page-about .about-team__card--b {
    margin-top: clamp(18px, 3vw, 34px);
  }

  .page-about .about-team__card--c {
    margin-top: clamp(36px, 6vw, 68px);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapters a,
  .page-about .about-links a,
  .page-about .about-entry__toggle::after {
    transition: none;
  }
}
<<<END>>>