.page-about {
  --about-rail: 64px;
  --about-team: var(--bw-green);
  display: block;
  background: var(--bw-paper);
  color: var(--bw-ink);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-crumbwrap {
  padding-top: 16px;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--bw-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--bw-moss);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin: 0 7px;
  color: var(--bw-stone);
}

.page-about .about-crumb a {
  color: var(--bw-green);
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  text-decoration: underline;
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(18px, 4vw, 38px) 0 clamp(28px, 5vw, 50px);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3.4vw, 30px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--bw-font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.4vw, 50px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--bw-ink);
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-family: var(--bw-font-body);
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--bw-ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 24px);
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--bw-sand);
  clip-path: var(--bw-cut);
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--bw-font-mono);
  font-size: clamp(24px, 4.6vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--bw-sand-deep);
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--bw-sand-deep);
}

/* 章节骨架 */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 2.2vw, 20px);
  padding: clamp(26px, 4.4vw, 46px) 0;
  border-top: 1px solid var(--bw-stone);
}

.page-about .about-chapter--last {
  border-bottom: 1px solid var(--bw-stone);
}

.page-about .about-chapter__rail {
  position: relative;
  display: flex;
  align-items: flex-start;
}

.page-about .about-chapter__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--bw-green);
  color: var(--bw-paper);
  clip-path: var(--bw-cut-xs);
  font-family: var(--bw-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-chapter__num--light {
  background: var(--bw-sand);
  color: var(--bw-sand-deep);
}

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

.page-about .about-chapter__head {
  margin-bottom: 18px;
}

.page-about .about-chapter__title {
  margin: 8px 0 0;
  font-family: var(--bw-font-display);
  font-size: clamp(21px, 3.4vw, 32px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--bw-ink);
}

.page-about .about-chapter__note {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-moss);
}

/* 媒体 */
.page-about .bw-media__caption {
  margin-top: 8px;
  font-family: var(--bw-font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--bw-moss);
}

.page-about .about-timeline__media {
  margin: 0 0 clamp(18px, 3vw, 26px);
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(170px, 30vw, 290px);
  object-fit: cover;
  clip-path: var(--bw-cut);
}

/* 时间线 */
.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  display: grid;
  gap: 12px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--bw-green), var(--bw-sand));
}

.page-about .about-timeline__node {
  background: #ffffff;
  clip-path: var(--bw-cut-sm);
  box-shadow: inset 0 0 0 1px var(--bw-stone);
  transition: box-shadow 0.2s ease;
}

.page-about .about-timeline__node[open] {
  box-shadow: inset 0 0 0 2px var(--bw-lift);
}

.page-about .about-timeline__node summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-timeline__node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--bw-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--bw-green);
}

.page-about .about-timeline__node[open] summary::after {
  content: "−";
}

.page-about .about-timeline__node summary:focus-visible {
  outline: 2px solid var(--bw-coral);
  outline-offset: -3px;
}

.page-about .about-timeline__year {
  flex: 0 0 auto;
  padding: 4px 9px;
  background: var(--bw-mist);
  color: var(--bw-green);
  clip-path: var(--bw-cut-xs);
  font-family: var(--bw-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-timeline__label {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--bw-ink);
}

.page-about .about-timeline__detail {
  padding: 0 18px 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-moss);
}

.page-about .about-timeline__detail p {
  margin: 0;
}

/* 小组分工 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--bw-paper);
  clip-path: var(--bw-cut-sm);
  box-shadow: inset 0 0 0 1px var(--bw-stone);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-3px);
  box-shadow: inset 0 0 0 2px var(--about-team);
}

.page-about .about-team__bar {
  position: absolute;
  left: 0;
  top: 0;
  width: 72px;
  height: 5px;
  background: var(--about-team);
}

.page-about .about-team__card--green { --about-team: var(--bw-green); }
.page-about .about-team__card--sand { --about-team: var(--bw-sand); }
.page-about .about-team__card--violet { --about-team: var(--bw-violet); }
.page-about .about-team__card--coral { --about-team: var(--bw-coral); }

.page-about .about-team__role {
  margin: 4px 0 0;
  font-family: var(--bw-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--bw-moss);
}

.page-about .about-team__name {
  margin: 6px 0 8px;
  font-family: var(--bw-font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--bw-ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--bw-moss);
}

.page-about .about-team__media {
  margin: 16px 0 0;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(180px, 30vw, 270px);
  object-fit: cover;
  clip-path: var(--bw-cut);
}

/* 审核路径 */
.page-about .about-audit__media {
  margin: 0 0 16px;
}

.page-about .about-audit__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(130px, 22vw, 210px);
  object-fit: cover;
  clip-path: var(--bw-cut);
  opacity: 0.92;
}

.page-about .about-audit__tablist {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-audit__tab {
  flex: 0 0 auto;
  padding: 10px 16px;
  border: 0;
  background: var(--bw-mist);
  color: var(--bw-ink);
  clip-path: var(--bw-cut-xs);
  font-family: var(--bw-font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-about .about-audit__tab:hover {
  background: var(--bw-lift);
}

.page-about .about-audit__tab[aria-selected="true"] {
  background: var(--bw-green);
  color: var(--bw-paper);
}

.page-about .about-audit__tab:focus-visible {
  outline: 2px solid var(--bw-coral);
  outline-offset: 2px;
}

.page-about .about-audit__panel {
  margin-top: 12px;
  padding: 20px 18px;
  background: #ffffff;
  clip-path: var(--bw-cut-sm);
  box-shadow: inset 0 0 0 1px var(--bw-stone);
}

.page-about .about-audit__panel + .about-audit__panel {
  margin-top: 10px;
}

.page-about .about-audit__title {
  margin: 0 0 8px;
  font-family: var(--bw-font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--bw-green);
}

.page-about .about-audit__text {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--bw-moss);
}

/* 更新节奏 */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-cadence__item {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: var(--bw-mist);
  clip-path: var(--bw-cut-sm);
}

.page-about .about-cadence__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--bw-green);
}

.page-about .about-cadence__item:nth-child(2)::before { background: var(--bw-sand); }
.page-about .about-cadence__item:nth-child(3)::before { background: var(--bw-violet); }
.page-about .about-cadence__item:nth-child(4)::before { background: var(--bw-coral); }

.page-about .about-cadence__when,
.page-about .about-cadence__who {
  display: inline-block;
  font-family: var(--bw-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--bw-green);
}

.page-about .about-cadence__name {
  margin: 6px 0 6px;
  font-family: var(--bw-font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--bw-ink);
}

.page-about .about-cadence__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--bw-moss);
}

/* 合作与改版：深色版块 */
.page-about .about-chapter--dark {
  background: var(--bw-green-dark);
  color: var(--bw-paper);
  padding-left: clamp(14px, 3vw, 28px);
  padding-right: clamp(14px, 3vw, 28px);
  clip-path: var(--bw-cut);
}

.page-about .about-chapter--dark .about-chapter__title--light {
  color: var(--bw-paper);
}

.page-about .about-chapter--dark .about-kicker--light {
  color: var(--bw-sand);
}

.page-about .about-chapter--dark .about-chapter__note--light {
  color: rgba(251, 250, 246, 0.78);
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partner__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 16px 16px 0;
  border-top: 1px solid rgba(251, 250, 246, 0.22);
}

.page-about .about-partner__num {
  flex: 0 0 auto;
  min-width: 58px;
  font-family: var(--bw-font-mono);
  font-size: clamp(22px, 3.6vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--bw-sand);
}

.page-about .about-partner__name {
  margin: 0 0 5px;
  font-family: var(--bw-font-display);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--bw-paper);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(251, 250, 246, 0.8);
}

/* 收尾行动区 */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--bw-sand);
  clip-path: var(--bw-cut);
}

.page-about .about-cta__title {
  margin: 8px 0 0;
  font-family: var(--bw-font-display);
  font-size: clamp(20px, 3.2vw, 28px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--bw-sand-deep);
}

.page-about .about-cta .bw-kicker {
  color: var(--bw-sand-deep);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--bw-sand-deep);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-cta__list li a {
  display: block;
  padding: 11px 14px;
  background: rgba(251, 250, 246, 0.62);
  color: var(--bw-sand-deep);
  clip-path: var(--bw-cut-xs);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  transition: background-color 0.18s ease;
}

.page-about .about-cta__list li a:hover,
.page-about .about-cta__list li a:focus-visible {
  background: var(--bw-paper);
}

/* 断点 */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-about {
    --about-rail: 76px;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 clamp(18px, 2.8vw, 36px);
    padding: clamp(30px, 4.6vw, 52px) 0;
  }

  .page-about .about-chapter__rail::before {
    content: "";
    position: absolute;
    left: 20px;
    top: 52px;
    bottom: -52px;
    width: 2px;
    background: var(--bw-stone);
  }

  .page-about .about-chapter__rail::after {
    content: "";
    position: absolute;
    left: 15px;
    top: 62px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bw-sand);
  }

  .page-about .about-chapter--last .about-chapter__rail::before {
    bottom: 0;
  }

  .page-about .about-timeline__list {
    padding-left: 26px;
  }

  .page-about .about-timeline__list::before {
    left: 6px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.52fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-hero__stats {
    position: sticky;
    top: calc(var(--bw-header-h) + 18px);
  }

  .page-about .about-chapter__body {
    max-width: 980px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 36px);
    align-items: start;
  }

  .page-about .about-partner {
    gap: 0 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-audit__tablist {
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-audit__tab,
  .page-about .about-cta__list li a {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: none;
  }
}
<<<END>>>