.page-about {
  --ab-rail: 150px;
  --ab-gap: clamp(1.4rem, 3.5vw, 3rem);
  display: block;
  background: var(--ink-900);
  color: var(--white);
  overflow-x: clip;
}

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

/* ---------- 顶部上下文 ---------- */
.page-about .ab-topline {
  padding-top: 1.1rem;
  padding-bottom: .4rem;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(1.4rem, 3.6vw, 2.4rem) clamp(2.2rem, 5.5vw, 4rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -18%;
  width: min(560px, 82vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 32% 32%, rgba(53, 230, 224, .20), transparent 62%),
    radial-gradient(circle at 72% 70%, rgba(255, 122, 47, .16), transparent 60%);
  z-index: -1;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .4;
  background-image:
    linear-gradient(to right, rgba(34, 48, 77, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 77, .55) 1px, transparent 1px);
  background-size: 68px 68px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .ab-hero__title {
  margin: .7rem 0 0;
  max-width: 14em;
  font-size: clamp(2.05rem, 6.4vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -.02em;
}

.page-about .ab-hero__lead {
  margin: 1.1rem 0 0;
  max-width: 40em;
  color: var(--mist);
}

.page-about .ab-hero__acts {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .ab-hero__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: 1rem 1.05rem 1.1rem;
  background: var(--ink-700);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-stat:hover {
  background: var(--ink-600);
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 4vw, 2.05rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .ab-stat__unit {
  font-size: .74rem;
  color: var(--dim);
}

.page-about .ab-stat__label {
  font-size: .82rem;
  color: var(--mist);
  line-height: 1.55;
}

.page-about .ab-stat__foot {
  grid-column: 1 / -1;
  margin: 0;
  padding: .7rem 1.05rem;
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  font-size: .76rem;
  color: var(--mist);
  letter-spacing: .02em;
}

@media (min-width: 940px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .8fr);
    align-items: end;
  }
}

/* ---------- 时间轴骨架 ---------- */
.page-about .ab-track {
  display: block;
}

.page-about .ab-phase {
  display: grid;
  grid-template-columns: 1fr;
  gap: .9rem;
  padding-block: clamp(2rem, 4.4vw, 3.2rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-phase__rail {
  display: flex;
  align-items: baseline;
  gap: .7rem;
}

.page-about .ab-phase__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .ab-phase__tag {
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--dim);
}

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

.page-about .ab-phase__body > * + * {
  margin-top: 1rem;
}

.page-about .ab-phase__body p {
  max-width: 38em;
}

.page-about .ab-phase__body a:not(.kit-btn) {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.page-about .ab-figure {
  margin: 1.5rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .ab-figure .kit-figure__img {
  width: 100%;
  object-fit: cover;
  border-radius: 0;
}

.page-about .ab-figure .kit-figure__cap {
  padding: .7rem 1rem .85rem;
  border-top: 1px solid var(--line);
  font-size: .76rem;
  color: var(--mist);
  line-height: 1.6;
}

.page-about .ab-inline-acts {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.3rem;
}

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

  .page-about .ab-phase__rail {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: .55rem;
    padding-right: 1.3rem;
    border-right: 1px solid var(--line);
  }

  .page-about .ab-phase__rail::before {
    content: "";
    position: absolute;
    top: .45rem;
    right: -5px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink-900);
    border: 2px solid var(--cyan);
    box-shadow: 0 0 0 4px rgba(53, 230, 224, .12);
  }
}

/* ---------- 工作方法三段 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-step {
  background: var(--ink-800);
  padding: 1.1rem 1.05rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: .45rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-step:hover {
  background: var(--ink-700);
}

.page-about .ab-step__n {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .ab-step .kit-h3 {
  margin: 0;
}

.page-about .ab-step p {
  margin: 0;
  font-size: .95rem;
  color: var(--mist);
  max-width: none;
}

@media (min-width: 780px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-note {
  margin-top: 1.3rem;
}

/* ---------- 实验室设备墙 ---------- */
.page-about .ab-lab .ab-phase__body > p {
  max-width: 40em;
}

.page-about .ab-rigs {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .5rem;
}

.page-about .ab-rig {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: .9rem;
  min-height: 66px;
  padding: .55rem .6rem .6rem;
  background: linear-gradient(158deg, var(--ink-700), var(--ink-800));
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-rig:hover,
.page-about .ab-rig:focus-visible,
.page-about .ab-rig:focus-within {
  border-color: var(--cyan);
  background: var(--ink-600);
  transform: translateY(-3px);
  outline: none;
}

.page-about .ab-rig:focus-visible {
  box-shadow: 0 0 0 2px rgba(53, 230, 224, .45);
}

.page-about .ab-rig__id {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .ab-rig__mem {
  font-size: .69rem;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-rig__pop {
  position: absolute;
  left: 0;
  bottom: calc(100% + 6px);
  z-index: 4;
  max-width: min(190px, 44vw);
  padding: .42rem .55rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--cyan);
  background: var(--ink-600);
  color: var(--white);
  font-size: .71rem;
  line-height: 1.55;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
  pointer-events: none;
}

.page-about .ab-rig:hover .ab-rig__pop,
.page-about .ab-rig:focus-visible .ab-rig__pop,
.page-about .ab-rig:focus-within .ab-rig__pop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .ab-lab__tip {
  margin-top: .9rem;
  font-size: .82rem;
  color: var(--dim);
}

@media (min-width: 620px) {
  .page-about .ab-rigs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: .6rem;
  }
}

@media (min-width: 980px) {
  .page-about .ab-rigs {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(1.3rem, 3vw, 2.4rem);
  margin-top: 1.5rem;
}

.page-about .ab-team__chart {
  display: grid;
  gap: 1.1rem;
  justify-items: center;
  align-content: start;
}

.page-about .ab-ring-wrap {
  width: min(250px, 68vw);
}

.page-about .ab-ring-wrap svg {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .ab-ring {
  fill: none;
  stroke-width: 22;
  transform: rotate(-90deg);
  transform-box: fill-box;
  transform-origin: center;
  transition: stroke-width var(--dur) var(--ease);
}

.page-about .ab-ring--a { stroke: var(--cyan); }
.page-about .ab-ring--b { stroke: var(--orange); }
.page-about .ab-ring--c { stroke: var(--gold); }
.page-about .ab-ring--d { stroke: var(--mist); }

.page-about .ab-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .35rem;
  width: 100%;
  max-width: 340px;
}

.page-about .ab-legend__item {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .42rem .6rem;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-size: .85rem;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-legend__item:hover,
.page-about .ab-legend__item:focus-visible {
  border-color: var(--line);
  background: var(--ink-800);
  outline: none;
}

.page-about .ab-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex: none;
}

.page-about .ab-legend__dot--a { background: var(--cyan); }
.page-about .ab-legend__dot--b { background: var(--orange); }
.page-about .ab-legend__dot--c { background: var(--gold); }
.page-about .ab-legend__dot--d { background: var(--mist); }

.page-about .ab-legend__name {
  flex: 1;
  color: var(--white);
}

.page-about .ab-legend__val {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--dim);
  letter-spacing: .03em;
  transition: color var(--dur) var(--ease);
}

.page-about .ab-legend__item:hover .ab-legend__val,
.page-about .ab-legend__item:focus-visible .ab-legend__val {
  color: var(--cyan);
}

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

.page-about .ab-team__side .kit-figure {
  max-width: 340px;
}

.page-about .ab-roles {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .ab-role {
  border-left: 2px solid var(--line);
  padding-left: .85rem;
}

.page-about .ab-role--a { border-left-color: var(--cyan); }
.page-about .ab-role--b { border-left-color: var(--orange); }
.page-about .ab-role--c { border-left-color: var(--gold); }
.page-about .ab-role--d { border-left-color: var(--mist); }

.page-about .ab-role__n {
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .05em;
  color: var(--mist);
}

.page-about .ab-role .kit-h3 {
  margin: .15rem 0 .3rem;
  font-size: 1.05rem;
}

.page-about .ab-role p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: none;
}

@media (min-width: 640px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem 1.4rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-cadence li {
  background: var(--ink-800);
  padding: 1rem 1.05rem 1.15rem;
}

.page-about .ab-cadence__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  letter-spacing: .04em;
  color: var(--orange);
  margin-bottom: .4rem;
}

.page-about .ab-cadence p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: none;
}

@media (min-width: 700px) {
  .page-about .ab-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .ab-cadence {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 专区身份（暖纸） ---------- */
.page-about .ab-paper {
  margin-top: clamp(2rem, 5vw, 3.4rem);
  border-radius: var(--r-lg);
  padding: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .ab-paper__grid {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  margin-top: 1.1rem;
}

.page-about .ab-paper__text p {
  max-width: 36em;
}

.page-about .ab-paper__text p + p {
  margin-top: .9rem;
}

.page-about .ab-facts {
  margin: 0;
  display: grid;
  gap: 1px;
  background: rgba(16, 24, 40, .14);
  border: 1px solid rgba(16, 24, 40, .16);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .ab-facts__row {
  background: #FBF6EC;
  padding: .7rem .9rem;
}

.page-about .ab-facts dt {
  font-size: .72rem;
  letter-spacing: .1em;
  color: #5A6472;
}

.page-about .ab-facts dd {
  margin: .2rem 0 0;
  font-size: .94rem;
  line-height: 1.6;
  color: var(--paper-ink);
  overflow-wrap: anywhere;
}

@media (min-width: 560px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-paper__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 收尾入口 ---------- */
.page-about .ab-cta {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
  padding-top: clamp(1.4rem, 3.5vw, 2.2rem);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 30em;
  font-size: .95rem;
  color: var(--mist);
}

.page-about .ab-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }

  .page-about .ab-rig:hover,
  .page-about .ab-rig:focus-visible {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>