.page-about {
  --about-line: rgba(127, 243, 236, 0.16);
  --about-ink-line: rgba(5, 7, 15, 0.12);
  background: var(--night);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 52px) 0 clamp(40px, 7vw, 88px);
  isolation: isolate;
}

.page-about .about-hero__plate {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(148deg, rgba(43, 224, 214, 0.13), transparent 46%),
    linear-gradient(328deg, rgba(5, 7, 15, 0.95), transparent 60%);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 0 100%);
}

.page-about .about-hero__ring {
  position: absolute;
  right: -12%;
  top: 6%;
  width: clamp(200px, 32vw, 440px);
  aspect-ratio: 1;
  border: 1px solid rgba(43, 224, 214, 0.28);
  border-radius: 50%;
  z-index: -1;
}

.page-about .eyebrow {
  margin: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  max-width: 15em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.8);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  background: var(--night);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-fact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--index);
}

@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 44px);
  padding-bottom: clamp(48px, 8vw, 110px);
}

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

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 3vw, 34px);
  min-width: 0;
}

@media (min-width: 1020px) {
  .page-about .about-grid {
    grid-template-columns: minmax(180px, 224px) minmax(0, 1fr);
    column-gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
  }
}

/* ---------- 章节目录 ---------- */
.page-about .toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--index);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .toc__list > li {
  flex: 0 0 auto;
}

.page-about .toc__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 13px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  color: rgba(244, 247, 251, 0.64);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms ease, background-color 200ms ease, border-color 200ms ease;
}

.page-about .toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--index);
}

.page-about .toc__link:hover {
  color: var(--cyan-soft);
  background: rgba(43, 224, 214, 0.07);
}

.page-about .toc__link[aria-current="true"] {
  color: var(--cyan);
  background: rgba(43, 224, 214, 0.09);
  border-left-color: var(--cyan);
}

.page-about .toc__link[aria-current="true"] .toc__num {
  color: var(--cyan-soft);
}

@media (min-width: 1020px) {
  .page-about .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .toc__list > li {
    flex: none;
  }

  .page-about .toc__link {
    white-space: normal;
  }
}

/* ---------- 章节容器 ---------- */
.page-about .chapter {
  position: relative;
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 52px);
  min-width: 0;
}

.page-about .chapter--paper {
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .chapter--night {
  background: var(--panel);
  color: var(--paper);
  border: 1px solid var(--about-line);
}

.page-about .chapter--cyan {
  background: var(--cyan);
  color: var(--ink-900);
}

.page-about .chapter--cyan .chapter-head__num {
  color: rgba(5, 7, 15, 0.32);
}

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about .chapter-head__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: rgba(43, 224, 214, 0.45);
  flex: 0 0 auto;
}

.page-about .chapter--paper .chapter-head__num {
  color: rgba(5, 7, 15, 0.2);
}

.page-about .chapter-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .chapter p {
  font-size: 15.5px;
  line-height: 1.85;
  max-width: 42em;
  margin: 0 0 1em;
}

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

.page-about .chapter--paper p {
  color: rgba(5, 7, 15, 0.78);
}

.page-about .chapter--night p {
  color: rgba(244, 247, 251, 0.8);
}

.page-about .chapter--cyan p {
  color: rgba(5, 7, 15, 0.82);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--panel-2);
  border: 1px solid var(--about-ink-line);
}

.page-about .chapter--night .about-figure {
  border-color: var(--about-line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 900 / 700;
  object-fit: cover;
}

.page-about .about-figure--full {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-figure--full img {
  aspect-ratio: 1600 / 700;
}

.page-about .chapter--paper .media-frame__caption {
  color: rgba(5, 7, 15, 0.6);
}

.page-about .chapter--night .media-frame__caption {
  color: var(--index);
}

.page-about .media-frame__caption {
  font-size: 12.5px;
  line-height: 1.6;
  padding: 10px 14px 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

@media (min-width: 760px) {
  .page-about .about-figure--offset {
    width: min(74%, 540px);
    margin-left: auto;
  }

  .page-about .about-figure--offset img {
    aspect-ratio: 900 / 700;
  }

  .page-about .about-figure:not(.about-figure--offset):not(.about-figure--full) img {
    aspect-ratio: 1200 / 800;
  }
}

/* ---------- 服务对象卡片 ---------- */
.page-about .audience-list {
  list-style: none;
  margin: clamp(18px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .audience-card {
  background: var(--panel-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  padding: 20px 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-about .audience-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.page-about .audience-card__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .audience-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  margin: 0;
  color: var(--paper);
}

.page-about .audience-card p {
  font-size: 14.5px;
  line-height: 1.8;
  margin: 0;
  color: rgba(244, 247, 251, 0.76);
}

.page-about .audience-card__note {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--cyan) !important;
}

@media (min-width: 820px) {
  .page-about .audience-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .audience-list > li:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .audience-list > li:nth-child(3) {
    margin-top: 60px;
  }
}

/* ---------- 发展时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px 44px;
  min-width: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(43, 224, 214, 0.5), rgba(127, 243, 236, 0.06));
}

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

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 2px;
  width: 19px;
  height: 19px;
  display: grid;
  place-items: center;
  color: var(--cyan);
}

.page-about .tl-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--index) !important;
  margin: 0 0 4px;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.25;
  margin: 0 0 6px;
  color: var(--paper);
}

.page-about .tl-detail {
  font-size: 14.5px;
  line-height: 1.8;
  margin: 0;
  color: rgba(244, 247, 251, 0.74) !important;
  max-width: 40em;
  overflow: hidden;
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .tl-detail {
    max-height: 0;
    opacity: 0;
    transition: max-height 320ms ease, opacity 240ms ease;
  }

  .page-about .tl-item:hover .tl-detail,
  .page-about .tl-item:focus-within .tl-detail {
    max-height: 14em;
    opacity: 1;
  }
}

/* ---------- 团队四象限 ---------- */
.page-about .team-grid {
  margin-top: clamp(18px, 3vw, 28px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-cell {
  background: #ffffff;
  border: 1px solid var(--about-ink-line);
  border-radius: var(--radius-md);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-about .team-cell:hover {
  transform: translateY(-3px);
  border-color: rgba(43, 224, 214, 0.55);
}

.page-about .team-cell__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(5, 7, 15, 0.42) !important;
  margin: 0;
}

.page-about .team-cell__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.3;
  margin: 0;
  color: var(--ink-900);
}

.page-about .team-cell p {
  font-size: 14.5px;
  line-height: 1.8;
  margin: 0;
  color: rgba(5, 7, 15, 0.74) !important;
}

.page-about .team-cell__more {
  margin-top: auto !important;
  padding-top: 10px;
  border-top: 1px dashed var(--about-ink-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: rgba(5, 7, 15, 0.55) !important;
}

.page-about .team-note {
  margin-top: clamp(18px, 3vw, 26px) !important;
  padding-left: 16px;
  border-left: 3px solid var(--cyan);
  font-size: 14px !important;
  color: rgba(5, 7, 15, 0.7) !important;
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 结尾青色区块 ---------- */
.page-about .next-list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .next-list li {
  font-size: 15px;
  line-height: 1.8;
  padding-left: 22px;
  position: relative;
  color: rgba(5, 7, 15, 0.84);
  max-width: 42em;
}

.page-about .next-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .next-list strong {
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.page-about .cta-btn--solid {
  background: var(--ink-900);
  color: var(--cyan);
}

.page-about .cta-btn--outline {
  border: 1.5px solid rgba(5, 7, 15, 0.7);
  color: var(--ink-900);
}

.page-about .cta-btn:hover {
  transform: translateY(-2px);
}

.page-about .cta-btn--outline:hover {
  background: rgba(5, 7, 15, 0.08);
}

.page-about .cta-btn:focus-visible {
  outline: 2px solid var(--ink-900);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .page-about .cta-btn {
    width: 100%;
    justify-content: center;
  }
}
<<<END>>>