.page-about {
  --ab-cut: 14px;
  --ab-gap: clamp(20px, 4vw, 48px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-cover {
  position: relative;
  padding-block: clamp(28px, 6vw, 72px) clamp(40px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-cover__crumb {
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-about .ab-cover__frame {
  position: relative;
  display: grid;
  gap: var(--ab-gap);
  padding: clamp(24px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(56, 242, 200, 0.10), transparent 58%),
    linear-gradient(165deg, var(--ink-2), var(--ink) 68%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .ab-cover__no {
  margin: 0 0 18px;
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-cover__title {
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(38px, 10vw, 100px);
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .ab-cover__lead {
  max-width: 32em;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.9;
  margin: 0 0 clamp(22px, 3vw, 34px);
}

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

/* 牌面扇形切片 */
.page-about .ab-deck {
  position: relative;
  min-height: 200px;
  display: none;
}

.page-about .ab-deck__card {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 44%;
  aspect-ratio: 2 / 3;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    linear-gradient(180deg, rgba(56, 242, 200, 0.12), rgba(4, 18, 14, 0.92));
  transform-origin: 50% 118%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.page-about .ab-deck__card::after {
  content: "";
  position: absolute;
  inset: 10% 12%;
  border: 1px solid rgba(56, 242, 200, 0.16);
  border-radius: 4px;
}

.page-about .ab-deck__card--a {
  transform: translateX(-56%) rotate(-24deg);
  opacity: 0.55;
}

.page-about .ab-deck__card--b {
  transform: translateX(-50%) rotate(-6deg);
  opacity: 0.8;
}

.page-about .ab-deck__card--c {
  transform: translateX(-40%) rotate(13deg);
}

/* 首屏数据 */
.page-about .ab-cover__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 4vw, 36px) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-figure {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink);
}

.page-about .ab-figure dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .ab-figure dd {
  margin: 0;
  font-size: 22px;
  color: var(--cyan);
}

/* ---------- 主体布局 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: var(--ab-gap);
  padding-block: clamp(40px, 7vw, 96px);
}

.page-about .ab-rail__label {
  margin: 0 0 14px;
  font-family: var(--font-cond);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .ab-index {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .se-index-list__item {
  flex: 0 0 auto;
}

.page-about .se-index-list__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .se-index-list__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-deep);
}

.page-about .se-index-list__link:hover,
.page-about .se-index-list__link:focus-visible,
.page-about .se-index-list__link[aria-current="true"] {
  color: var(--cyan);
}

.page-about .se-index-list__link[aria-current="true"] .se-index-list__no {
  color: var(--cyan);
}

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

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
  padding-block: clamp(44px, 7vw, 90px);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .ab-chapter__no {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-chapter__no::after {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.6;
}

.page-about .ab-chapter__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(28px, 6vw, 48px);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--paper);
}

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

.page-about .ab-chapter__body .se-prose {
  max-width: 34em;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .ab-aside {
  margin: 24px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-family: var(--font-cond);
}

/* ---------- 图片 ---------- */
.page-about .ab-media {
  margin: 26px 0;
  padding: 8px;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .ab-media .se-media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.04);
}

.page-about .ab-media .se-media__cap {
  margin: 10px 4px 4px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  position: relative;
  margin: 8px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(56, 242, 200, 0.05));
}

.page-about .ab-tl__item {
  position: relative;
  margin-bottom: 18px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
}

.page-about .ab-tl__year {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .ab-tl__card {
  padding: 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-left: 2px solid rgba(56, 242, 200, 0.4);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background 300ms var(--ease), border-color 300ms var(--ease);
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 17px;
  color: var(--paper);
}

.page-about .ab-tl__card p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-tl__more {
  margin-top: 10px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px !important;
  color: var(--cyan-deep) !important;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 1px;
  margin: 24px 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-team__row {
  padding: 16px 16px 18px;
  background: var(--ink);
  transition: background 260ms var(--ease);
}

.page-about .ab-team__row:hover,
.page-about .ab-team__row:focus-within {
  background: var(--panel);
}

.page-about .ab-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-team__name {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 16px;
  color: var(--paper);
}

.page-about .ab-team__count {
  font-size: 20px;
  color: var(--cyan);
}

.page-about .ab-team__dots {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 10px 0 12px;
}

.page-about .ab-dot {
  width: 8px;
  height: 8px;
  border-radius: 1px;
  background: var(--cyan-deep);
}

.page-about .ab-dot--amber {
  background: var(--amber);
}

.page-about .ab-team__duty {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 资质 ---------- */
.page-about .ab-honor {
  margin: 22px 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-honor__item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-honor__year {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .ab-honor__text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 理念 ---------- */
.page-about .ab-principles {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .ab-pri {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .ab-pri__no {
  grid-row: span 2;
  font-size: 22px;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .ab-pri__title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 16px;
  color: var(--paper);
}

.page-about .ab-pri__text {
  margin: 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  margin-top: 32px;
  padding: 22px;
  border: 1px solid var(--line);
  background:
    linear-gradient(150deg, rgba(56, 242, 200, 0.08), rgba(4, 18, 14, 0.9));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-cta__lead {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(20px, 3.4vw, 26px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .ab-cover__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .ab-cover__frame {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: end;
  }

  .page-about .ab-deck {
    display: block;
  }

  .page-about .ab-chapter {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: clamp(28px, 5vw, 72px);
  }

  .page-about .ab-chapter__head {
    position: sticky;
    top: 40px;
    align-self: start;
  }

  .page-about .ab-tl__card {
    padding: 18px 22px;
  }
}

@media (min-width: 980px) {
  .page-about .ab-layout {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .ab-index {
    flex-direction: column;
    gap: 14px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line-soft);
    padding-left: 14px;
  }

  .page-about .se-index-list__link {
    font-size: 13px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-chapter__body {
    padding-right: 54px;
  }

  .page-about .ab-aside {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: 0.2em;
  }
}

/* 悬停展开版本要点 */
@media (hover: hover) and (min-width: 880px) {
  .page-about .ab-tl__more {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0 !important;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 320ms var(--ease), opacity 260ms var(--ease),
      margin-top 320ms var(--ease), padding-top 320ms var(--ease);
  }

  .page-about .ab-tl__item:hover .ab-tl__more,
  .page-about .ab-tl__item:focus-within .ab-tl__more {
    max-height: 160px;
    opacity: 1;
    margin-top: 10px !important;
    padding-top: 10px;
    border-top-color: var(--line-soft);
  }

  .page-about .ab-tl__item:hover .ab-tl__card,
  .page-about .ab-tl__item:focus-within .ab-tl__card {
    background: var(--panel);
    border-left-color: var(--cyan);
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__card,
  .page-about .ab-tl__more,
  .page-about .ab-team__row,
  .page-about .se-index-list__link {
    transition: none;
  }
}
<<<END>>>