.page-about {
  --about-rail: 300px;
  display: block;
  background:
    radial-gradient(1100px 620px at 88% -8%, rgba(53, 242, 208, 0.10), transparent 62%),
    radial-gradient(760px 460px at -6% 42%, rgba(255, 107, 44, 0.08), transparent 60%),
    var(--ink-800);
  color: var(--text);
  padding-bottom: clamp(64px, 9vw, 120px);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(14px, 3vw, 26px);
}
.page-about .breadcrumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--stone);
}
.page-about .breadcrumbs a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--speed) var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--neon);
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏海报 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 6vw, 68px);
  border-bottom: 1px solid var(--line);
}

.page-about .masthead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

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

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--paper);
  margin: 0;
}

.page-about .masthead-lead {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .masthead-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .masthead-facts li {
  background: var(--ink-900);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--yellow);
}
.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  line-height: 1.4;
}

.page-about .masthead-media {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-about .masthead-media img {
  aspect-ratio: 14 / 9;
  border-radius: var(--radius-lg);
}
.page-about .masthead-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(160deg, rgba(53, 242, 208, 0.16), transparent 45%, rgba(255, 107, 44, 0.14));
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-top: clamp(36px, 5vw, 64px);
}

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

.page-about .about-side {
  display: grid;
  gap: 18px;
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(30px, 4.5vw, 52px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .section-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 76px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--stone);
  margin-bottom: 10px;
  user-select: none;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.45;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .about-section p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-section a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.4);
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}
.page-about .about-section a:hover,
.page-about .about-section a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-about .about-section .media {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
}
.page-about .about-section .media img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}
.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .timeline-media img {
  aspect-ratio: 4 / 3;
}
.page-about .team-media img {
  aspect-ratio: 3 / 2;
}

/* ---------- 四条内容线 ---------- */
.page-about .line-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .line-list li {
  position: relative;
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--neon);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--glass);
  transition: background var(--speed) var(--ease), transform var(--speed) var(--ease);
}
.page-about .line-list li:hover {
  background: var(--glass-2);
  transform: translateX(3px);
}
.page-about .line-list li:nth-child(2) {
  border-left-color: var(--orange);
}
.page-about .line-list li:nth-child(3) {
  border-left-color: var(--yellow);
}
.page-about .line-list li:nth-child(4) {
  border-left-color: var(--moss);
}
.page-about .line-list__name {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--neon);
  margin-bottom: 8px;
}
.page-about .line-list li:nth-child(2) .line-list__name {
  color: var(--orange);
}
.page-about .line-list li:nth-child(3) .line-list__name {
  color: var(--yellow);
}
.page-about .line-list li:nth-child(4) .line-list__name {
  color: #8FB58B;
}
.page-about .line-list strong {
  display: block;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 6px;
  line-height: 1.45;
}
.page-about .line-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: none;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon), var(--orange) 52%, var(--yellow));
  opacity: 0.55;
}
.page-about .timeline-item {
  position: relative;
  padding-bottom: 26px;
}
.page-about .timeline-item:last-child {
  padding-bottom: 0;
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-800);
  border: 2px solid var(--neon);
}
.page-about .timeline-item:nth-child(3)::before {
  border-color: var(--orange);
}
.page-about .timeline-item:nth-child(4)::before {
  border-color: var(--yellow);
}
.page-about .timeline-item:nth-child(5)::before {
  border-color: var(--moss);
}
.page-about .timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink-900);
  background: var(--yellow);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.page-about .timeline-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .team-cell {
  background: var(--ink-900);
  padding: 22px 20px;
  border-top: 3px solid var(--neon);
}
.page-about .team-cell--orange {
  border-top-color: var(--orange);
}
.page-about .team-cell--moss {
  border-top-color: var(--moss);
}
.page-about .team-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--neon);
  margin-bottom: 12px;
}
.page-about .team-cell--orange .team-cell__num {
  color: var(--orange);
}
.page-about .team-cell--moss .team-cell__num {
  color: #8FB58B;
}
.page-about .team-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: none;
}

/* ---------- 覆盖 ---------- */
.page-about .coverage-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .coverage-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .coverage-k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--stone);
  text-transform: uppercase;
}
.page-about .coverage-v {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-tags {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .partner-tags li {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  line-height: 1.4;
  color: var(--paper);
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 14px;
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}
.page-about .partner-tags li:nth-child(1),
.page-about .partner-tags li:nth-child(2) {
  border-color: rgba(53, 242, 208, 0.42);
  color: var(--neon);
}
.page-about .partner-tags li:nth-child(3) {
  border-color: rgba(255, 107, 44, 0.45);
  color: var(--orange);
}
.page-about .partner-tags li:nth-child(4),
.page-about .partner-tags li:nth-child(5) {
  border-color: rgba(192, 122, 91, 0.5);
  color: #D99B7E;
}
.page-about .partner-tags li:hover {
  background: var(--glass-2);
}
.page-about .partner-note {
  margin-top: 18px !important;
  padding-left: 14px;
  border-left: 2px solid var(--moss);
  color: var(--text-dim) !important;
  font-size: 14.5px !important;
}

/* ---------- 使用规模 ---------- */
.page-about .scale-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}
.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(53, 242, 208, 0.09), rgba(255, 107, 44, 0.06));
}
.page-about .scale-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}
.page-about .scale-num em {
  font-style: normal;
  font-size: 0.46em;
  margin-left: 3px;
  color: var(--yellow);
  letter-spacing: 0.02em;
}
.page-about .scale-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}
.page-about .scale-tail {
  margin-top: 22px !important;
  font-size: 15px !important;
  color: var(--text-dim) !important;
}

/* ---------- 侧栏目录与数据牌 ---------- */
.page-about .toc {
  padding: 18px 20px;
}
.page-about .toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--neon);
}
.page-about .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  counter-reset: toc;
}
.page-about .toc__link {
  display: block;
  padding: 7px 10px 7px 26px;
  position: relative;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-dim);
  text-decoration: none;
  border-radius: 8px;
  transition: color var(--speed) var(--ease), background var(--speed) var(--ease);
}
.page-about .toc__link::before {
  counter-increment: toc;
  content: counter(toc, decimal-leading-zero);
  position: absolute;
  left: 8px;
  top: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--stone);
}
.page-about .toc__link:hover,
.page-about .toc__link:focus-visible {
  color: var(--paper);
  background: var(--glass);
}
.page-about .toc__link.is-current {
  color: var(--ink-900);
  background: var(--neon);
  font-weight: 700;
}
.page-about .toc__link.is-current::before {
  color: rgba(6, 18, 30, 0.6);
}

.page-about .about-datacard {
  padding: 18px 20px 20px;
}
.page-about .datacard-title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--orange);
}
.page-about .datacard-list {
  list-style: none;
  margin: 14px 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .datacard-list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}
.page-about .datacard-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .datacard-k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}
.page-about .datacard-v {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: anywhere;
}
.page-about .datacard-cta {
  display: inline-block;
  width: 100%;
  text-align: center;
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .masthead-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .coverage-list li {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 760px) {
  .page-about .line-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .scale-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .masthead-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 5vw, 60px);
  }
  .page-about h1 {
    font-size: clamp(46px, 5.4vw, 74px);
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    align-items: start;
  }
  .page-about .about-side {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
  }
}

@media (min-width: 1180px) {
  .page-about {
    --about-rail: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-list li,
  .page-about .toc__link,
  .page-about .partner-tags li,
  .page-about .breadcrumbs a {
    transition: none;
  }
  .page-about .line-list li:hover {
    transform: none;
  }
}
<<<END>>>