.page-about {
  --about-pad-y: 56px;
  --about-rule: 1px solid var(--line);
  background: var(--ink-950);
  color: var(--rice);
  overflow-wrap: break-word;
}

@media (min-width: 720px) {
  .page-about {
    --about-pad-y: 80px;
  }
}

@media (min-width: 1080px) {
  .page-about {
    --about-pad-y: 104px;
  }
}

/* ---------- 首屏跨页 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 8px) 0 0;
  border-bottom: 1px solid var(--line);
  isolation: isolate;
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  opacity: 0.36;
}

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

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(57, 230, 208, 0.18) 0%, rgba(5, 18, 31, 0) 62%),
    linear-gradient(180deg, rgba(5, 18, 31, 0.45) 0%, rgba(5, 18, 31, 0.88) 66%, var(--ink-950) 100%);
}

.page-about .about-hero-inner {
  display: grid;
  gap: 32px;
  padding: 26px 0 48px;
}

.page-about .about-hero-lead {
  min-width: 0;
}

.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-tag::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .about-title {
  margin: 20px 0 0;
  max-width: 14em;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 8vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--rice);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 30em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

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

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

.page-about .about-facts-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-facts-list li {
  display: grid;
  grid-template-columns: minmax(70px, 28%) minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts-num {
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-facts-label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 56px;
    padding: 48px 0 80px;
    align-items: start;
  }

  .page-about .about-lede {
    font-size: 17px;
  }

  .page-about .about-facts {
    border-left: 1px solid var(--line);
    padding-left: 32px;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: var(--about-pad-y) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--band {
  background: var(--ink-900);
}

.page-about .about-section-head h2 {
  margin: 18px 0 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--rice);
}

.page-about .about-section-head {
  margin-bottom: 26px;
}

@media (min-width: 900px) {
  .page-about .about-split {
    display: grid;
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    column-gap: 64px;
    align-items: start;
  }

  .page-about .about-split > .about-section-head {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin-bottom: 0;
    padding-right: 8px;
    border-right: 1px solid var(--line);
  }
}

/* ---------- 正文 ---------- */
.page-about .about-copy p {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.88;
  color: var(--mist);
}

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

.page-about .about-copy .about-lead-in {
  font-size: 17px;
  line-height: 1.72;
  color: var(--rice);
}

.page-about .about-copy-single {
  margin: 0 0 24px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 概览数字 ---------- */
.page-about .about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 30px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-stats li {
  flex: 1 1 116px;
  min-width: 0;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-stat-num {
  display: block;
  font-size: 24px;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 三步方法 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-step {
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--stone);
  transition: border-color 180ms var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-left-color: var(--cyan);
}

.page-about .about-step-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--rice);
}

.page-about .about-step p {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 团队矩阵 ---------- */
.page-about .about-team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team-item {
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: 20px 18px 22px;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-team-item:hover,
.page-about .about-team-item:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-team-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--terracotta);
}

.page-about .about-team-item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--rice);
}

.page-about .about-team-item p {
  margin: 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 640px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-item:hover,
  .page-about .about-team-item:focus-within {
    transform: none;
  }
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-about .about-figure figcaption {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.65;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 协作网络 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-partners li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partner-num {
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--moss);
}

.page-about .about-partner-label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--rice);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 24px;
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--ink-950);
  border: 2px solid var(--terracotta);
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-tl-item:hover::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-tl-year {
  display: block;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--terracotta);
}

.page-about .about-tl-body h3 {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--rice);
}

.page-about .about-tl-note {
  margin: 8px 0 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-tl-note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 220ms var(--ease), opacity 180ms var(--ease), margin-top 220ms var(--ease);
  }

  .page-about .about-tl-item:hover .about-tl-note,
  .page-about .about-tl-item:focus-within .about-tl-note {
    max-height: 14em;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-note,
  .page-about .about-tl-item::before,
  .page-about .about-step {
    transition: none;
  }
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: var(--about-pad-y) 0 calc(var(--about-pad-y) + 8px);
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}

.page-about .about-next-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-next-lead h2 {
  margin: 18px 0 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.28;
  color: var(--rice);
}

.page-about .about-next-lead p {
  margin: 16px 0 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-next-links a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 48px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--ink-950);
  color: var(--rice);
  text-decoration: none;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-next-links a:hover,
.page-about .about-next-links a:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-next-key {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-next-label {
  font-size: 15px;
  line-height: 1.6;
  color: var(--rice);
}

@media (min-width: 900px) {
  .page-about .about-next-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: 64px;
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next-links a:hover,
  .page-about .about-next-links a:focus-visible {
    transform: none;
  }
}
<<<END>>>