.page-about {
  background: var(--paper-50);
  color: var(--ink-900);
  font-family: var(--font-body);
  line-height: 1.75;
}

.page-about .about-top {
  padding-top: 16px;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  padding: 26px 0 44px;
  background: linear-gradient(180deg, var(--paper-100) 0%, var(--paper-50) 82%);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold-600);
}

.page-about .about-kicker::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--cinnabar-600);
}

.page-about .about-h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 6.2vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-lead {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  color: var(--ink-700);
}

.page-about .about-index {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-index li {
  border-bottom: 1px solid var(--line);
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  font-size: 14px;
  color: var(--ink-900);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cinnabar-600);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--gold-600);
}

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

.page-about .about-cover__media {
  aspect-ratio: 14 / 9;
  overflow: hidden;
  background: var(--paper-100);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  box-shadow: var(--shadow-card);
}

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

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 46px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-block:last-of-type {
  border-bottom: 0;
}

.page-about .about-head {
  margin-bottom: 24px;
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(23px, 4.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--ink-900);
}

.page-about .about-intro {
  margin: 0 0 26px;
  max-width: 66ch;
  font-size: 16px;
  color: var(--ink-700);
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
  font-size: 16px;
  color: var(--ink-700);
}

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

.page-about .about-note {
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold-600);
  font-size: 14px;
  color: var(--slate-600);
  max-width: 64ch;
}

/* ---------- 主张 ---------- */
.page-about .about-claim {
  margin: 30px 0 0;
  padding: 22px 20px 20px;
  background: var(--paper-100);
  border-left: 3px solid var(--cinnabar-600);
  border-radius: 0 2px 2px 0;
}

.page-about .about-claim__text {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 4.2vw, 30px);
  line-height: 1.3;
  color: var(--ink-900);
}

.page-about .about-claim__note {
  margin: 0;
  font-size: 13px;
  color: var(--slate-600);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow {
  margin: 0 0 28px;
  padding: 16px 10px 8px;
  background: var(--paper-50);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .flow-line {
  fill: none;
  stroke: var(--gold-600);
  stroke-width: 2;
}

.page-about .flow-dash {
  stroke: var(--slate-200);
  stroke-width: 1;
  stroke-dasharray: 4 6;
}

.page-about .flow-node {
  fill: var(--paper-50);
  stroke: var(--cinnabar-600);
  stroke-width: 3;
}

.page-about .flow-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 22px;
  fill: var(--ink-900);
}

.page-about .about-data {
  display: grid;
  gap: 26px;
}

.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .stage {
  padding: 18px 16px 16px;
  background: var(--paper-50);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .stage__tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold-600);
}

.page-about .stage h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .stage p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate-600);
}

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

.page-about .about-data__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--paper-100);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

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

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

.page-about .team-card {
  padding: 20px 18px 22px;
  background: var(--paper-50);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  box-shadow: var(--shadow-card);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: var(--gold-600);
}

.page-about .team-card:focus-within {
  border-color: var(--gold-600);
}

.page-about .team-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-card h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .team-card__count {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold-600);
}

.page-about .team-card ul {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .team-card li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-600);
}

.page-about .team-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  background: var(--gold-600);
}

.page-about .about-stats {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-stats__item {
  background: var(--paper-50);
  padding: 16px 14px;
}

.page-about .about-stats__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate-600);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions__figure {
  margin: 0 0 30px;
}

.page-about .about-versions__media {
  aspect-ratio: 2 / 1;
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

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

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding-left: 26px;
  padding-bottom: 26px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}

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

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--gold-600);
}

.page-about .tl-ver {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  margin-bottom: 6px;
}

.page-about .tl-ver .num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .tl-stage {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate-600);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .tl-body > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .tl-more {
  margin-top: 12px;
}

.page-about .tl-more > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--gold-600);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .tl-more > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-more > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-about .tl-more[open] > summary::before {
  content: "−";
}

.page-about .tl-more > summary:hover {
  border-color: var(--gold-600);
  color: var(--cinnabar-600);
}

.page-about .tl-more p {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-600);
}

/* ---------- 内容节奏 ---------- */
.page-about .rhythm-grid {
  display: grid;
  gap: 26px;
}

.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .rhythm-list li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .rhythm-list__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--gold-600);
  padding-top: 4px;
}

.page-about .rhythm-list h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .rhythm-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-600);
}

.page-about .sub-panel {
  padding: 24px 20px;
  background: var(--ink-700);
  color: var(--paper-100);
  border-radius: 2px;
}

.page-about .sub-panel h3 {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  color: var(--paper-50);
}

.page-about .sub-panel ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .sub-panel li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-100);
}

.page-about .sub-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--amber-500);
}

.page-about .sub-panel__links {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid rgba(248, 243, 233, 0.18);
}

.page-about .sub-panel__links a {
  color: var(--amber-500);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .sub-panel__links a:hover,
.page-about .sub-panel__links a:focus-visible {
  color: var(--paper-50);
  border-bottom-color: var(--amber-500);
}

/* ---------- 合作 ---------- */
.page-about .coop-grid {
  display: grid;
  gap: 16px;
}

.page-about .coop-card {
  padding: 20px 18px;
  background: var(--paper-100);
  border-top: 2px solid var(--gold-600);
  border-radius: 0 0 2px 2px;
}

.page-about .coop-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .coop-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-600);
}

.page-about .about-cta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.page-about .about-cta__note {
  font-size: 13px;
  color: var(--slate-600);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-about .sub-panel__links {
    flex-direction: row;
    gap: 20px;
  }
}

@media (min-width: 940px) {
  .page-about .about-cover {
    padding: 36px 0 56px;
  }

  .page-about .about-cover__inner {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 44px;
  }

  .page-about .about-cover__figure {
    margin-top: 34px;
  }

  .page-about .about-block {
    padding: 62px 0;
  }

  .page-about .about-index a {
    font-size: 15px;
    padding: 13px 0;
  }

  .page-about .about-data {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 34px;
  }

  .page-about .about-data__figure {
    margin-top: 8px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
  }

  .page-about .team-card:nth-child(1) {
    grid-column: span 7;
  }

  .page-about .team-card:nth-child(2) {
    grid-column: span 5;
    margin-top: 28px;
  }

  .page-about .team-card:nth-child(3) {
    grid-column: span 5;
  }

  .page-about .team-card:nth-child(4) {
    grid-column: span 7;
    margin-top: 28px;
  }

  .page-about .rhythm-grid {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 128px 1fr;
    gap: 26px;
    padding-left: 28px;
    padding-bottom: 32px;
  }

  .page-about .tl-ver {
    margin-bottom: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .tl-ver .num {
    font-size: 20px;
  }

  .page-about .tl-body > p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-index a,
  .page-about .tl-more > summary,
  .page-about .sub-panel__links a {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>