.page-about {
  --ab-line: rgba(244, 241, 232, .10);
  --ab-block: clamp(42px, 6vw, 78px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--hdr) + 46px) 0 clamp(38px, 6vw, 68px);
  background:
    radial-gradient(120% 88% at 86% 0%, rgba(255, 179, 0, .11), transparent 62%),
    radial-gradient(90% 70% at 4% 100%, rgba(63, 160, 255, .07), transparent 66%),
    var(--board);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-hero__in {
  display: grid;
  gap: 34px;
}

@media (min-width: 980px) {
  .page-about .ab-hero__in {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 400px);
    align-items: end;
    gap: 64px;
  }
}

.page-about .ab-crumbs {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--index);
}

.page-about .ab-crumbs a {
  color: var(--index);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}

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

.page-about .ab-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .ab-h1 {
  margin: 16px 0 0;
  font-size: clamp(30px, 5.8vw, 56px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-stat__v {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
  color: var(--amber);
}

.page-about .ab-stat__k {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: var(--index);
  letter-spacing: .04em;
}

.page-about .ab-hero__fig {
  position: relative;
  margin: 0;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--ab-line);
}

.page-about .ab-hero__fig::before,
.page-about .ab-hero__fig::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 0 solid var(--amber);
}

.page-about .ab-hero__fig::before {
  top: -1px;
  left: -1px;
  border-top-width: 2px;
  border-left-width: 2px;
}

.page-about .ab-hero__fig::after {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(.92) contrast(1.05);
}

.page-about .ab-hero__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--index);
}

/* ---------- 主体框架 ---------- */
.page-about .ab-shell {
  display: grid;
  gap: 30px;
  padding-top: var(--ab-block);
  padding-bottom: var(--ab-block);
}

@media (min-width: 900px) {
  .page-about .ab-shell {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 58px;
  }
}

.page-about .ab-rail {
  align-self: start;
  display: flex;
  flex-direction: row;
  gap: 4px 16px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .ab-rail::-webkit-scrollbar {
  display: none;
}

@media (min-width: 900px) {
  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--hdr) + 26px);
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .ab-rail__link {
  display: block;
  position: relative;
  padding: 6px 0 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--index);
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s ease;
}

.page-about .ab-rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 1px;
  background: currentColor;
  opacity: .5;
  transition: width .25s ease, opacity .25s ease, background .25s ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--orange);
}

.page-about .ab-rail__link.is-active,
.page-about .ab-rail__link[aria-current="true"] {
  color: var(--amber);
}

.page-about .ab-rail__link.is-active::before,
.page-about .ab-rail__link[aria-current="true"]::before {
  width: 13px;
  opacity: 1;
  background: var(--amber);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding: clamp(34px, 4.6vw, 58px) 0;
  border-top: 1px solid var(--ab-line);
}

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

.page-about .ab-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .ab-h2 {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.26;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-p {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .ab-inline {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 0, .4);
  transition: border-color .25s ease;
}

.page-about .ab-inline:hover {
  border-bottom-color: var(--amber);
}

/* ---------- 三条做法 ---------- */
.page-about .ab-cards {
  display: grid;
  gap: 16px;
  margin: 30px 0 0;
}

@media (min-width: 720px) {
  .page-about .ab-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-cards > :nth-child(2) {
    margin-top: 26px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-cards > :nth-child(3) {
    margin-top: 52px;
  }
}

.page-about .ab-card {
  position: relative;
  padding: 26px 20px 26px;
  background: var(--panel);
  border: 1px solid var(--ab-line);
  transition: border-color .3s ease, background .3s ease;
}

.page-about .ab-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  width: 30px;
  height: 2px;
  background: var(--amber);
}

.page-about .ab-card:hover {
  border-color: rgba(255, 179, 0, .4);
  background: var(--panel-2);
}

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

.page-about .ab-card__title {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .ab-card__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  position: relative;
  list-style: none;
  margin: 32px 0 0;
  padding: 0 0 0 26px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber) 0%, rgba(255, 179, 0, .22) 68%, transparent 100%);
  opacity: .6;
}

@media (min-width: 720px) {
  .page-about .ab-tl {
    padding-left: 34px;
  }

  .page-about .ab-tl::before {
    left: 9px;
  }
}

.page-about .ab-tl__item {
  position: relative;
}

.page-about .ab-tl__item + .ab-tl__item {
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 179, 0, .13);
}

@media (min-width: 720px) {
  .page-about .ab-tl__item::before {
    left: -30px;
  }
}

.page-about .ab-tl__sum {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 12px;
  align-items: center;
  gap: 0 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  transition: color .25s ease;
}

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

.page-about .ab-tl__sum::marker {
  content: "";
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1;
  color: var(--amber);
}

.page-about .ab-tl__label {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ab-tl__sum:hover .ab-tl__label {
  color: var(--amber);
}

.page-about .ab-tl__mark {
  position: relative;
  width: 12px;
  height: 12px;
}

.page-about .ab-tl__mark::before,
.page-about .ab-tl__mark::after {
  content: "";
  position: absolute;
  background: var(--index);
  transition: transform .25s ease, background .25s ease;
}

.page-about .ab-tl__mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-about .ab-tl__mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-about .ab-tl__node[open] .ab-tl__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-about .ab-tl__node[open] .ab-tl__mark::before {
  background: var(--amber);
}

.page-about .ab-tl__panel {
  padding: 0 0 24px 76px;
}

@media (max-width: 719px) {
  .page-about .ab-tl__panel {
    padding-left: 0;
  }
}

.page-about .ab-tl__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 三组分工 ---------- */
.page-about .ab-crew {
  display: grid;
  gap: 16px;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

@media (min-width: 760px) {
  .page-about .ab-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-crew__item {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--ab-line);
  background:
    linear-gradient(180deg, rgba(255, 179, 0, .06), transparent 58%),
    var(--panel);
}

.page-about .ab-crew__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1;
  color: rgba(244, 241, 232, .16);
}

.page-about .ab-crew__name {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-crew__desc {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .ab-fig {
  margin: 32px 0 0;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--ab-line);
  filter: saturate(.9) contrast(1.05);
}

.page-about .ab-fig__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--index);
}

/* ---------- 合作方向 ---------- */
.page-about .ab-tags {
  display: grid;
  gap: 16px;
  margin: 30px 0 0;
}

@media (min-width: 720px) {
  .page-about .ab-tags {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-tagcard {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--ab-line);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.page-about .ab-tagcard::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 14px;
  width: 18px;
  height: 1px;
  background: var(--ab-line);
  transition: width .3s ease, background .3s ease;
}

.page-about .ab-tagcard:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 179, 0, .42);
  box-shadow: 8px 8px 0 -1px var(--board), 8px 8px 0 0 var(--ab-line);
}

.page-about .ab-tagcard:hover::after {
  width: 30px;
  background: var(--amber);
}

.page-about .ab-tagchip {
  display: inline-block;
}

.page-about .ab-tagcard__title {
  margin: 14px 0 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .ab-tagcard__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 归属信息 ---------- */
.page-about .ab-note {
  display: grid;
  gap: 20px;
  margin: 30px 0 0;
  padding: 26px 22px;
  background: var(--panel);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--amber);
}

@media (min-width: 760px) {
  .page-about .ab-note {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 36px;
    padding: 28px 30px;
  }
}

.page-about .ab-note__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--index);
  text-transform: uppercase;
}

.page-about .ab-note__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ab-note__v a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 0, .38);
  transition: border-color .25s ease;
}

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

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .ab-tl__sum {
    grid-template-columns: 54px minmax(0, 1fr) 12px;
    gap: 0 10px;
  }

  .page-about .ab-tl__year {
    font-size: 17px;
  }

  .page-about .ab-tl__label {
    font-size: 15px;
  }

  .page-about .ab-stats {
    gap: 14px 22px;
  }

  .page-about .ab-note {
    padding: 22px 16px;
  }
}
<<<END>>>