.page-about {
  --ab-rule: 1px solid rgba(185, 179, 167, .55);
  --ab-lift: 0 1px 0 rgba(17, 19, 17, .05), 0 8px 0 -3px rgba(247, 243, 232, .95), 0 14px 30px rgba(10, 26, 42, .12);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 85% at 88% -15%, rgba(255, 90, 31, .26), transparent 62%),
    var(--arena);
  color: var(--chalk);
  padding: clamp(22px, 4vw, 40px) 0 clamp(72px, 11vw, 128px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(108deg, rgba(247, 243, 232, .055) 0 2px, transparent 2px 28px);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__crumbs .crumbs {
  margin: 0 0 clamp(26px, 5vw, 48px);
}

.page-about .ab-hero__crumbs a,
.page-about .ab-hero__crumbs .crumbs__item {
  color: rgba(247, 243, 232, .72);
}

.page-about .ab-hero__crumbs a:hover {
  color: var(--amber);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: end;
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .ab-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 8.6vw, 96px);
  line-height: 1.02;
  letter-spacing: -.015em;
  color: var(--chalk);
}

.page-about .ab-hero__lead {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(247, 243, 232, .86);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__media {
  margin: 0;
  transform: rotate(-1.6deg);
  background: var(--chalk);
  padding: 8px 8px 0;
  box-shadow: 0 0 0 1px rgba(247, 243, 232, .5), 0 22px 44px rgba(0, 0, 0, .42);
}

.page-about .ab-hero__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-hero__cap {
  padding: 10px 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--tunnel);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(36px, 6vw, 72px) clamp(56px, 8vw, 96px);
}

.page-about .ab-index {
  border-top: 3px solid var(--signal);
  padding-top: 12px;
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--stone);
}

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

.page-about .ab-index__item a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 12px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  background: var(--mist);
  border-left: 3px solid transparent;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--tunnel);
}

.page-about .ab-index__item a:hover,
.page-about .ab-index__item a:focus-visible {
  background: var(--chalk);
  border-left-color: var(--signal);
  outline: none;
}

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

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding-block: clamp(32px, 5vw, 56px);
  border-top: var(--ab-rule);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(12px, 2.4vw, 24px);
  row-gap: 8px;
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ab-sec__num {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(40px, 8vw, 76px);
  line-height: .82;
  letter-spacing: -.03em;
  color: var(--stone);
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(24px, 3.8vw, 40px);
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--arena);
}

.page-about .ab-sec__lead {
  grid-column: 2;
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.78;
  color: #46505a;
}

.page-about .ab-prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 36em;
}

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

.page-about .ab-quote {
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 18px 20px 16px;
  background: var(--chalk);
  border-left: 4px solid var(--clay);
  box-shadow: var(--ab-lift);
}

.page-about .ab-quote p {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(17px, 2.4vw, 22px);
  line-height: 1.5;
  color: var(--arena);
}

.page-about .ab-quote__src {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--stone);
}

/* ---------- 三条规矩（标签页） ---------- */
.page-about .ab-rules {
  border: var(--ab-rule);
  background: var(--chalk);
  box-shadow: var(--ab-lift);
}

.page-about .ab-rules__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 10px 10px 0;
  background: var(--mist);
  border-bottom: 1px solid rgba(185, 179, 167, .6);
}

.page-about .ab-rules__tab {
  padding: 9px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--tunnel);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .ab-rules__tab:hover {
  color: var(--arena);
  background: rgba(247, 243, 232, .7);
}

.page-about .ab-rules__tab[aria-selected="true"] {
  color: var(--arena);
  border-bottom-color: var(--signal);
  background: var(--chalk);
}

.page-about .ab-rules__tab:focus-visible {
  outline: 2px solid var(--turf);
  outline-offset: -3px;
}

.page-about .ab-rules__panel {
  padding: clamp(18px, 3vw, 30px);
}

.page-about .ab-rules__h {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 24px);
  color: var(--arena);
}

.page-about .ab-rules__panel p {
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
}

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

/* ---------- 版本 ---------- */
.page-about .ab-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 36px);
  align-items: start;
}

.page-about .ab-track {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), var(--stone) 55%, var(--mist));
}

.page-about .ab-track__item {
  position: relative;
  margin-bottom: 10px;
}

.page-about .ab-track__item:last-child {
  margin-bottom: 0;
}

.page-about .ab-track__dot {
  position: absolute;
  left: -26px;
  top: 15px;
  width: 14px;
  height: 14px;
  background: var(--chalk);
  border: 3px solid var(--signal);
  transform: rotate(45deg);
}

.page-about .ab-track__fold {
  background: var(--chalk);
  border: var(--ab-rule);
  box-shadow: 0 6px 0 -3px rgba(185, 179, 167, .5);
}

.page-about .ab-track__fold summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  font-family: var(--font-body);
  list-style: none;
}

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

.page-about .ab-track__fold summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--stone);
}

.page-about .ab-track__fold[open] summary::after {
  content: "收起";
  color: var(--signal);
}

.page-about .ab-track__ver {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--arena);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-track__name {
  font-size: 15px;
  font-weight: 500;
  color: var(--clay);
}

.page-about .ab-track__fold .fold__body {
  padding: 0 16px 16px;
  border-top: 1px dashed rgba(185, 179, 167, .75);
}

.page-about .ab-track__fold .fold__body p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
}

.page-about .ab-versions__figure {
  margin: 0;
  padding: 10px 10px 0;
  background: var(--tunnel);
  border: 1px solid rgba(247, 243, 232, .3);
  box-shadow: var(--ab-lift);
  transform: rotate(1.2deg);
}

.page-about .ab-versions__figure img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .ab-versions__figure figcaption {
  padding: 10px 2px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: rgba(247, 243, 232, .78);
}

.page-about .ab-versions__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--turf);
  font-size: 14.5px;
  line-height: 1.8;
  color: #46505a;
}

.page-about .ab-versions__note a {
  color: var(--clay);
  text-underline-offset: 3px;
}

.page-about .ab-versions__note a:hover {
  color: var(--signal);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 32px);
  align-items: start;
}

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

.page-about .ab-team__item {
  padding: 16px 16px 14px;
  background: var(--chalk);
  border-left: 4px solid var(--stone);
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-team__item--signal { border-left-color: var(--signal); }
.page-about .ab-team__item--turf { border-left-color: var(--turf); }
.page-about .ab-team__item--clay { border-left-color: var(--clay); }
.page-about .ab-team__item--mist { border-left-color: var(--tunnel); }

.page-about .ab-team__item:hover {
  transform: translateY(-2px);
  border-left-color: var(--amber);
}

.page-about .ab-team__tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .ab-team__desc {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .ab-team__peer {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--stone);
  transition: color .18s var(--ease);
}

.page-about .ab-team__item:hover .ab-team__peer {
  color: var(--tunnel);
}

.page-about .ab-team__figure {
  margin: 0;
  padding: 8px 8px 0;
  background: var(--chalk);
  border: var(--ab-rule);
  box-shadow: var(--ab-lift);
}

.page-about .ab-team__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-team__figure figcaption {
  padding: 10px 2px 12px;
  font-size: 12px;
  line-height: 1.65;
  color: #5b636a;
}

.page-about .ab-team__line {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 14px 16px;
  background: var(--mist);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--tunnel);
}

/* ---------- 节奏 ---------- */
.page-about .ab-cadence {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--stone);
  border: 1px solid var(--stone);
}

.page-about .ab-cadence__cell {
  padding: 18px 16px 16px;
  background: var(--chalk);
}

.page-about .ab-cadence__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--arena);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-cadence__unit {
  display: block;
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--signal);
}

.page-about .ab-cadence__label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: #46505a;
}

.page-about .ab-cadence__note {
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .ab-cadence__note p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 36em;
}

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

.page-about .ab-cadence__note a {
  color: var(--clay);
  text-underline-offset: 3px;
}

.page-about .ab-cadence__note a:hover {
  color: var(--signal);
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 36px);
  align-items: start;
}

.page-about .ab-partners__copy p {
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
}

.page-about .ab-partners__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-partners__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--stone);
  border: 1px solid var(--stone);
}

.page-about .ab-partners__list li {
  position: relative;
  padding: 14px 14px 14px 46px;
  background: var(--tunnel);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 243, 232, .86);
}

.page-about .ab-partners__list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .ab-partners__no {
  position: absolute;
  left: 14px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
}

/* ---------- 底部行动区 ---------- */
.page-about .ab-cta {
  margin-top: clamp(40px, 6vw, 64px);
  padding: clamp(24px, 4vw, 40px);
  background:
    linear-gradient(118deg, var(--arena) 0 62%, var(--tunnel) 62% 100%);
  color: var(--chalk);
  border-left: 6px solid var(--signal);
}

.page-about .ab-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.25;
  color: var(--chalk);
}

.page-about .ab-cta__text {
  margin: 0 0 22px;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 232, .84);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-body {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(40px, 5vw, 64px);
  }

  .page-about .ab-index {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-index__item a {
    display: flex;
    width: 100%;
    padding: 9px 12px;
    background: transparent;
    border-left: 3px solid rgba(185, 179, 167, .8);
  }

  .page-about .ab-index__item a:hover,
  .page-about .ab-index__item a:focus-visible {
    background: var(--mist);
    border-left-color: var(--signal);
  }

  .page-about .ab-versions {
    grid-template-columns: minmax(0, 1fr) 260px;
  }

  .page-about .ab-team-wrap {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__item,
  .page-about .ab-index__item a,
  .page-about .ab-rules__tab,
  .page-about .ab-team__peer {
    transition: none;
  }

  .page-about .ab-hero__media,
  .page-about .ab-versions__figure {
    transform: none;
  }
}
<<<END>>>