.page-about .about-hero {
  padding-block: clamp(44px, 7vw, 96px) clamp(56px, 9vw, 128px);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.page-about .about-hero__copy {
  max-width: 46ch;
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 6.2vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--sand);
  max-width: 40ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: clamp(32px, 4vw, 52px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  list-style: none;
  border-top: 1px solid var(--ink-line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  color: var(--gold-soft);
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}

.page-about .about-hero__visual {
  display: flex;
  justify-content: center;
}

.page-about .about-hero__svg {
  width: 100%;
  max-width: 520px;
  height: auto;
}

.page-about .about-hero__pulse {
  transform-origin: 280px 280px;
  animation: about-arc-drift 18s linear infinite;
}

@keyframes about-arc-drift {
  from { transform: rotate(-90deg); }
  to { transform: rotate(270deg); }
}

/* 章节导航 */
.page-about .about-toc {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 8px 22px;
  flex-wrap: wrap;
  padding-block: 16px;
}

.page-about .about-toc__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.page-about .about-toc .toc__link {
  position: relative;
  font-family: var(--font-editorial);
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--gold);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--ink);
  border-bottom-color: var(--gold);
}

/* 区块标题微调 */
.page-about .section-head {
  max-width: 62ch;
  margin-bottom: clamp(32px, 4.5vw, 56px);
}

.page-about .section-head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .section-head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .section-head__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about a.about-lines__link,
.page-about a.about-reach__link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

.page-about a.about-lines__link:hover,
.page-about a.about-reach__link:hover {
  color: var(--gold);
}

/* 时间线 */
.page-about .about-timeline {
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
}

.page-about .about-timeline__intro {
  max-width: 56ch;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(14px, 2.4vw, 26px);
  border-left: 1px solid var(--rule);
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-bottom: clamp(28px, 4vw, 48px);
}

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

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 30px);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: 0.02em;
  border-bottom: 2px solid var(--gold);
  justify-self: start;
  padding-bottom: 4px;
}

.page-about .about-timeline__card {
  background: var(--sand);
  border-left: 3px solid var(--ink-line);
  padding: clamp(16px, 2.2vw, 26px) clamp(16px, 2.4vw, 28px);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-timeline__card:hover {
  border-left-color: var(--gold);
  transform: translateX(3px);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.3;
}

.page-about .about-timeline__card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-timeline__points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-timeline__points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-timeline__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

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

.page-about .about-timeline__media .media-frame {
  margin: 0;
}

/* 产品线 */
.page-about .about-lines {
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .about-lines__grid {
  display: grid;
  gap: clamp(16px, 2vw, 26px);
}

.page-about .about-line {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.2vw, 26px) clamp(16px, 2vw, 22px);
  border-left: 3px solid var(--rule);
  min-height: 100%;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

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

.page-about .about-line--tools { border-left-color: var(--sage); }
.page-about .about-line--tags { border-left-color: var(--gold); }
.page-about .about-line--member { border-left-color: var(--ink-line); }
.page-about .about-line--desktop { border-left-color: var(--clay); }

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

.page-about .about-line .record-card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.page-about .about-line .record-card__title {
  margin: 2px 0 0;
  font-family: var(--font-editorial);
  font-size: clamp(18px, 1.7vw, 21px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-line p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-line .record-card__meta {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--text-soft);
}

/* 团队 */
.page-about .about-team {
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
}

.page-about .about-team__bar {
  display: flex;
  gap: 3px;
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  height: 16px;
}

.page-about .about-team__seg {
  border-radius: var(--radius);
  transition: opacity 200ms var(--ease);
}

.page-about .about-team__seg--content { flex: 12; background: var(--sage); }
.page-about .about-team__seg--design { flex: 9; background: var(--gold); }
.page-about .about-team__seg--tech { flex: 14; background: var(--ink-line); }
.page-about .about-team__seg--support { flex: 7; background: var(--clay); }

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

.page-about .about-team__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0 20px 16px;
  border-top: 1px solid var(--rule);
  border-left: 2px solid var(--rule);
}

.page-about .about-team__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-team__item--content { border-left-color: var(--sage); }
.page-about .about-team__item--design { border-left-color: var(--gold); }
.page-about .about-team__item--tech { border-left-color: var(--ink-line); }
.page-about .about-team__item--support { border-left-color: var(--clay); }

.page-about .about-team__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-soft);
}

.page-about .about-team__num {
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-team__desc h3 {
  margin: 0 0 6px;
  font-family: var(--font-editorial);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team__desc p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-team__media .media-frame {
  margin: 0;
}

/* 认证 */
.page-about .about-cert {
  padding-block: clamp(56px, 8vw, 112px);
  color: var(--paper);
}

.page-about .about-cert__head h2 {
  color: var(--paper);
}

.page-about .about-cert__head p {
  color: var(--sand);
}

.page-about .about-cert__grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
}

.page-about .about-cert__item {
  background: var(--ink-2);
  border-left: 3px solid var(--gold);
  padding: clamp(22px, 2.6vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-cert__seal {
  width: 64px;
  height: 64px;
  color: var(--gold-soft);
}

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

.page-about .about-cert__item h3 {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-cert__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sand);
}

.page-about .about-cert__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: aboutStep;
}

.page-about .about-cert__steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sand);
  padding-top: 12px;
  border-top: 1px solid var(--ink-line);
}

.page-about .about-cert__stepnum {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* 服务与生态 */
.page-about .about-reach {
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .about-reach__map {
  margin: 0 0 clamp(32px, 5vw, 60px);
}

.page-about .about-reach__stats {
  display: grid;
  gap: clamp(20px, 2.6vw, 32px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--rule);
}

.page-about .about-reach__stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-reach__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 500;
  line-height: 1.15;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-reach__stat h3 {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-reach__stat p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-reach__note {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 60ch;
}

/* 结尾 */
.page-about .about-closing {
  padding-block: clamp(64px, 10vw, 148px);
}

.page-about .about-closing__head {
  margin-bottom: clamp(26px, 3.4vw, 44px);
}

.page-about .about-closing__notes {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-closing__note h3 {
  margin: 0 0 8px;
  font-family: var(--font-editorial);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-closing__note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-closing__statement {
  margin: clamp(36px, 5vw, 64px) 0 0;
  font-family: var(--font-editorial);
  font-size: clamp(18px, 2.1vw, 26px);
  line-height: 1.7;
  color: var(--ink);
  max-width: 34ch;
  padding-left: 20px;
  border-left: 2px solid var(--gold);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}

/* 媒体框微调 */
.page-about .media-frame {
  position: relative;
  overflow: hidden;
}

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

/* 平板及以上 */
@media (min-width: 640px) {
  .page-about .about-timeline__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 8px 24px;
    align-items: start;
  }

  .page-about .about-team__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 6px 20px;
    align-items: start;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

/* 桌面 */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

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

@media (min-width: 1024px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    align-items: start;
  }

  .page-about .about-timeline__media {
    position: sticky;
    top: 104px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
    align-items: start;
  }

  .page-about .about-lines__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__pulse {
    animation: none;
  }

  .page-about .about-timeline__card,
  .page-about .about-line,
  .page-about .about-team__seg,
  .page-about .about-toc .toc__link {
    transition: none;
  }

  .page-about .about-timeline__card:hover,
  .page-about .about-line:hover {
    transform: none;
  }
}
<<<END>>>