.page-about {
  --ab-chap: 56px;
  --ab-paper-line: rgba(20, 32, 58, .16);
  --ab-paper-text: #3f4d68;
  --ab-teal: #0f9fb5;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 15vw, 148px) 0 clamp(44px, 7vw, 76px);
  background:
    radial-gradient(120% 88% at 88% -6%, rgba(0, 229, 255, .16), transparent 62%),
    radial-gradient(90% 70% at 6% 108%, rgba(255, 107, 53, .12), transparent 60%),
    linear-gradient(180deg, var(--cmd-deep), var(--cmd-void));
  border-bottom: 1px solid var(--cmd-line);
}

.page-about .ab-hero__mesh {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 58, 102, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 102, .38) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 82%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .ab-hero__title {
  margin: 18px 0 0;
  font-size: clamp(34px, 8.6vw, 84px);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--cmd-text);
}

.page-about .ab-hero__lede {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 46ch;
  color: var(--cmd-muted);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
}

.page-about .ab-figures {
  margin: clamp(34px, 5vw, 60px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--cmd-line);
  border: 1px solid var(--cmd-line);
}

.page-about .ab-figures__item {
  background: var(--cmd-void);
  padding: 18px 16px 20px;
}

.page-about .ab-figures dt {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cmd-muted);
}

.page-about .ab-figures dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--cmd-text);
}

.page-about .ab-figures dd .cmd-num {
  font-family: var(--cmd-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1;
  color: var(--cmd-cyan);
  letter-spacing: -.01em;
}

.page-about .ab-figures__unit {
  font-size: 13px;
  color: var(--cmd-muted);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .ab-section,
.page-about .ab-flow,
.page-about .ab-next {
  padding: clamp(52px, 8vw, 100px) 0;
}

.page-about .ab-ch {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 3vw, 24px);
}

.page-about .ab-ch__num {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-ch__num span {
  font-family: var(--cmd-font-mono);
  font-size: 12px;
  letter-spacing: .32em;
  color: var(--cmd-gold);
}

.page-about .ab-ch__num::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--cmd-line);
}

.page-about .ab-ch__body > .cmd-prose {
  margin-top: 16px;
  max-width: 52ch;
  color: var(--cmd-muted);
}

@media (min-width: 900px) {
  .page-about .ab-ch {
    grid-template-columns: var(--ab-chap) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .ab-ch__num {
    flex-direction: column;
    align-items: center;
    gap: 16px;
    align-self: start;
    position: sticky;
    top: calc(var(--cmd-bar) + 40px);
  }

  .page-about .ab-ch__num span {
    writing-mode: vertical-rl;
    letter-spacing: .44em;
  }

  .page-about .ab-ch__num::after {
    flex: 0 0 auto;
    width: 1px;
    height: 88px;
    background: linear-gradient(180deg, var(--cmd-gold), transparent);
  }
}

/* ---------- 01 时间轴 ---------- */
.page-about .ab-stages {
  position: relative;
  overflow: hidden;
  background: var(--cmd-void);
}

.page-about .ab-stages__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .14;
  filter: saturate(.5) contrast(1.05);
  pointer-events: none;
}

.page-about .ab-stages .cmd-container {
  position: relative;
  z-index: 2;
}

.page-about .ab-tl {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-tl__track {
  display: flex;
  max-width: 100%;
  border-top: 1px solid var(--cmd-line);
  overflow-x: auto;
}

.page-about .ab-tl__node {
  flex: 1 0 auto;
  min-width: 152px;
  display: grid;
  gap: 5px;
  margin: 0;
  padding: 20px 16px 16px;
  position: relative;
  appearance: none;
  font: inherit;
  text-align: left;
  color: var(--cmd-muted);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--cmd-line);
  border-bottom: 1px solid var(--cmd-line);
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}

.page-about .ab-tl__node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 16px;
  width: 9px;
  height: 9px;
  background: var(--cmd-line);
  transition: background .2s ease;
}

.page-about .ab-tl__ver {
  font-family: var(--cmd-font-mono);
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--cmd-gold);
}

.page-about .ab-tl__name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .ab-tl__meta {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cmd-muted);
}

.page-about .ab-tl__node:hover {
  background: rgba(18, 41, 79, .55);
  color: var(--cmd-text);
}

.page-about .ab-tl__node[aria-selected="true"] {
  background: var(--cmd-panel);
  color: var(--cmd-text);
  border-bottom-color: transparent;
}

.page-about .ab-tl__node[aria-selected="true"]::before {
  background: var(--cmd-cyan);
}

.page-about .ab-tl__node:focus-visible {
  outline: 2px solid var(--cmd-cyan);
  outline-offset: -2px;
}

.page-about .ab-tl__panel {
  background: var(--cmd-panel);
  border: 1px solid var(--cmd-line);
  border-top: 0;
  padding: clamp(20px, 3vw, 34px);
}

.page-about .ab-tl__panel[hidden] {
  display: none;
}

.page-about .ab-tl__lead {
  margin: 0;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.75;
  color: var(--cmd-text);
}

.page-about .ab-tl__list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-tl__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cmd-muted);
}

.page-about .ab-tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 8px;
  background: var(--cmd-cyan);
}

/* ---------- 02 日常四条线 ---------- */
.page-about .ab-duty {
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--cmd-line);
}

.page-about .ab-duty__row {
  display: grid;
  gap: 8px;
  padding: 22px 0 24px;
  border-bottom: 1px solid var(--cmd-line);
}

.page-about .ab-duty__title {
  margin: 0;
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--cmd-text);
}

.page-about .ab-duty__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cmd-muted);
  max-width: 56ch;
}

.page-about .ab-duty__text a {
  color: var(--cmd-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-duty__cadence {
  margin: 0;
  font-family: var(--cmd-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cmd-orange);
}

@media (min-width: 860px) {
  .page-about .ab-duty__row {
    grid-template-columns: 170px minmax(0, 1fr) 140px;
    gap: 28px;
    align-items: start;
  }

  .page-about .ab-duty__cadence {
    text-align: right;
    padding-top: 6px;
  }
}

/* ---------- 03 数据流程（奶油纸） ---------- */
.page-about .ab-flow {
  background: var(--cmd-paper);
  color: var(--cmd-ink);
  border-top: 1px solid var(--cmd-line);
  border-bottom: 1px solid var(--cmd-line);
}

.page-about .ab-flow .ab-ch__num span {
  color: #96771b;
}

.page-about .ab-flow .ab-ch__num::after {
  background: var(--ab-paper-line);
}

.page-about .ab-flow__top {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .ab-flow__intro h2 {
  margin: 0;
  color: var(--cmd-ink);
}

.page-about .ab-flow__prose {
  margin: 16px 0 0;
  max-width: 42ch;
  color: var(--ab-paper-text);
}

.page-about .ab-flow__figure {
  margin: 0;
}

.page-about .ab-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--ab-paper-line);
}

.page-about .ab-flow__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: #5c6a86;
}

@media (min-width: 900px) {
  .page-about .ab-flow__top {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: end;
  }
}

.page-about .ab-steps {
  margin: clamp(32px, 5vw, 58px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--ab-paper-line);
  border: 1px solid var(--ab-paper-line);
}

.page-about .ab-step {
  position: relative;
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 24px 20px 28px;
  background: var(--cmd-paper);
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 20px;
  width: 8px;
  height: 8px;
  background: var(--ab-teal);
}

.page-about .ab-step__idx {
  font-family: var(--cmd-font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: #96771b;
}

.page-about .ab-step__title {
  margin: 0;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--cmd-ink);
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-paper-text);
}

@media (min-width: 800px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 04 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
}

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

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--cmd-line);
}

.page-about .ab-team__media figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cmd-muted);
}

.page-about .ab-team__info h2 {
  margin: 0;
}

.page-about .ab-team__info .cmd-prose {
  margin: 16px 0 0;
  max-width: 48ch;
  color: var(--cmd-muted);
}

.page-about .ab-team__bars {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

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

.page-about .ab-team__label {
  font-size: 15px;
  color: var(--cmd-text);
}

.page-about .ab-team__count {
  font-family: var(--cmd-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  color: var(--cmd-cyan);
}

.page-about .ab-team__track {
  margin-top: 9px;
  height: 10px;
  background: var(--cmd-void);
  border: 1px solid var(--cmd-line);
}

.page-about .ab-team__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, rgba(0, 229, 255, .5), var(--cmd-cyan));
  transition: background .2s ease, width .3s ease;
}

.page-about .ab-team__bar:nth-child(1) .ab-team__fill { width: 35.3%; }
.page-about .ab-team__bar:nth-child(2) .ab-team__fill { width: 26.5%; }
.page-about .ab-team__bar:nth-child(3) .ab-team__fill { width: 20.6%; }
.page-about .ab-team__bar:nth-child(4) .ab-team__fill { width: 17.6%; }

.page-about .ab-team__duty {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cmd-muted);
  transition: color .2s ease;
}

.page-about .ab-team__bar:hover .ab-team__fill,
.page-about .ab-team__bar:focus-within .ab-team__fill {
  background: linear-gradient(90deg, rgba(255, 107, 53, .6), var(--cmd-orange));
}

.page-about .ab-team__bar:hover .ab-team__duty,
.page-about .ab-team__bar:focus-within .ab-team__duty {
  color: var(--cmd-text);
}

.page-about .ab-team__note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--cmd-orange);
  font-size: 14px;
  line-height: 1.8;
  color: var(--cmd-muted);
}

@media (min-width: 900px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .ab-team__media {
    position: sticky;
    top: calc(var(--cmd-bar) + 40px);
  }
}

/* ---------- 05 合作生态 ---------- */
.page-about .ab-eco {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--cmd-line);
  border-top: 1px solid var(--cmd-line);
  border-bottom: 1px solid var(--cmd-line);
}

.page-about .ab-eco__item {
  background: var(--cmd-void);
  padding: 24px 20px 26px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .ab-eco__num {
  font-family: var(--cmd-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--cmd-gold);
}

.page-about .ab-eco__title {
  margin: 4px 0 0;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--cmd-text);
}

.page-about .ab-eco__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cmd-muted);
}

@media (min-width: 800px) {
  .page-about .ab-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 06 下一步 ---------- */
.page-about .ab-next {
  background: linear-gradient(180deg, var(--cmd-deep), var(--cmd-void));
  border-top: 1px solid var(--cmd-line);
}

.page-about .ab-next__grid {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-next__card {
  padding: 24px 22px 26px;
  background: var(--cmd-panel);
  border: 1px solid var(--cmd-line);
  border-left: 2px solid var(--cmd-cyan);
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .ab-next__tag {
  font-family: var(--cmd-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cmd-cyan);
}

.page-about .ab-next__title {
  margin: 0;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--cmd-text);
}

.page-about .ab-next__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cmd-muted);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  padding: clamp(48px, 8vw, 92px) 0;
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(255, 107, 53, .16), transparent 62%),
    var(--cmd-void);
  border-top: 1px solid var(--cmd-line);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .ab-cta__text h2 {
  margin: 0;
}

.page-about .ab-cta__text p {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cmd-muted);
}

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

.page-about .ab-cta__actions .cmd-btn:focus-visible {
  outline: 2px solid var(--cmd-cyan);
  outline-offset: 3px;
}

@media (min-width: 900px) {
  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__node,
  .page-about .ab-tl__node::before,
  .page-about .ab-team__fill,
  .page-about .ab-team__duty {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>