.page-about {
  --abt-shadow: 8px;
}

/* ---------- 首屏 ---------- */
.page-about .abt-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding-block: clamp(26px, 6vw, 54px) clamp(36px, 7vw, 76px);
}

.page-about .abt-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(112deg, rgba(224, 169, 60, .095) 0 2px, transparent 2px 28px),
    radial-gradient(circle at 82% 10%, rgba(179, 64, 31, .32), transparent 56%),
    radial-gradient(circle at 6% 94%, rgba(61, 220, 132, .14), transparent 48%);
}

.page-about .abt-hero .crumbs {
  color: rgba(251, 246, 236, .66);
  font-size: 14px;
}

.page-about .abt-hero .crumbs a {
  color: var(--green);
  text-decoration: none;
}

.page-about .abt-hero .crumbs a:hover {
  text-decoration: underline;
}

.page-about .abt-hero__eyebrow {
  margin: clamp(24px, 5vw, 48px) 0 0;
  color: var(--sand);
}

.page-about .abt-hero__title {
  margin: 12px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(38px, 9vw, 88px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--warm);
  max-width: 15ch;
}

.page-about .abt-hero__lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.88;
  color: rgba(251, 246, 236, .82);
}

.page-about .abt-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: rgba(224, 169, 60, .38);
  border: 2px solid rgba(224, 169, 60, .38);
}

.page-about .abt-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--ink);
  padding: 16px 14px;
}

.page-about .abt-stat__num {
  font-family: var(--mono);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .abt-stat__unit {
  font-size: .5em;
  margin-left: 2px;
  letter-spacing: 0;
}

.page-about .abt-stat__label {
  font-size: 13px;
  letter-spacing: .05em;
  color: rgba(251, 246, 236, .64);
}

/* ---------- 通用区块 ---------- */
.page-about .abt-sec {
  padding-block: clamp(44px, 8vw, 90px);
}

.page-about .abt-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 16px;
  align-items: start;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .abt-head .chapter-num {
  font-family: var(--mono);
  font-weight: 800;
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--red);
}

.page-about .abt-head .eyebrow {
  margin: 0;
  color: var(--red);
}

.page-about .abt-head h2 {
  margin: 8px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .abt-head--dark .chapter-num {
  color: var(--red-bright);
}

.page-about .abt-head--dark .eyebrow {
  color: var(--sand);
}

.page-about .abt-head--dark h2 {
  color: var(--warm);
}

.page-about .abt-lead {
  margin: 0 0 clamp(24px, 4vw, 38px);
  max-width: 68ch;
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .abt-note {
  background: var(--warm);
  border: var(--line) solid var(--ink);
  box-shadow: var(--abt-shadow) var(--abt-shadow) 0 var(--ink);
  padding: 22px 20px 24px;
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .abt-note:hover,
.page-about .abt-note:focus-within {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--ink);
}

.page-about .abt-note h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .abt-note p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .abt-claim__grid {
  display: grid;
  gap: 24px;
  padding-right: 8px;
  padding-bottom: 8px;
}

/* ---------- 团队 ---------- */
.page-about .abt-team__layout {
  display: grid;
  gap: 30px;
}

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

.page-about .abt-team__media img,
.page-about .abt-lab__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--line) solid var(--ink);
  box-shadow: var(--abt-shadow) var(--abt-shadow) 0 var(--red);
  background: var(--gray);
  object-fit: cover;
}

.page-about .abt-team__media figcaption,
.page-about .abt-gates__figure figcaption {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-3);
  max-width: 42ch;
}

.page-about .abt-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .abt-tab {
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 700;
  padding: 10px 15px;
  border: 2px solid var(--ink);
  background: transparent;
  color: var(--ink);
  border-radius: 0;
  cursor: pointer;
  transition: background .16s ease, color .16s ease;
}

.page-about .abt-tab:hover {
  background: var(--gray);
}

.page-about .abt-tab[aria-selected="true"],
.page-about .abt-tab.is-active {
  background: var(--ink);
  color: var(--green);
}

.page-about .abt-tab:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.page-about .abt-tabs__panels {
  margin-top: 14px;
  border: var(--line) solid var(--ink);
  background: var(--warm);
}

.page-about .abt-tabs__panel {
  padding: 22px 20px;
}

.page-about .abt-tabs__panel p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .abt-tabs__panel + .abt-tabs__panel {
  border-top: 2px dashed var(--gray);
}

.has-js .page-about .abt-tabs__panel {
  display: none;
}

.has-js .page-about .abt-tabs__panel.is-active {
  display: block;
}

.has-js .page-about .abt-tabs__panel + .abt-tabs__panel {
  border-top: 0;
}

/* ---------- 阶段轴 ---------- */
.page-about .abt-axis {
  margin-bottom: 6px;
}

.page-about .abt-axis__svg {
  display: none;
  width: 100%;
  height: auto;
}

.page-about .abt-stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .abt-stage {
  border-top: 3px solid var(--red);
  padding-top: 14px;
}

.page-about .abt-stage__num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--red);
}

.page-about .abt-stage h3 {
  margin: 8px 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .abt-stage p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-3);
}

/* ---------- 适配实验室 ---------- */
.page-about .abt-lab__split {
  display: grid;
  gap: 30px;
}

.page-about .abt-lab__media {
  margin: 0;
}

.page-about .abt-lab__body p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .abt-lab__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .abt-lab__list li {
  position: relative;
  padding-left: 24px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .abt-lab__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6em;
  width: 10px;
  height: 10px;
  background: var(--green-deep);
  border: 2px solid var(--ink);
}

/* ---------- 四道关卡 ---------- */
.page-about .abt-gates-layout {
  display: grid;
  gap: 32px;
}

.page-about .abt-gates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .abt-gate {
  border: 2px solid rgba(251, 246, 236, .26);
  background: var(--ink-2);
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .abt-gate:hover {
  border-color: rgba(61, 220, 132, .6);
  transform: translateY(-2px);
}

.page-about .abt-gate[open] {
  border-color: var(--green);
}

.page-about .abt-gate__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 800;
  color: var(--warm);
}

.page-about .abt-gate__summary::-webkit-details-marker {
  display: none;
}

.page-about .abt-gate__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--green);
}

.page-about .abt-gate[open] .abt-gate__summary::after {
  content: "-";
}

.page-about .abt-gate__summary:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: -4px;
}

.page-about .abt-gate__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sand);
  white-space: nowrap;
}

.page-about .abt-gate__body {
  padding: 0 18px 18px;
  color: rgba(251, 246, 236, .78);
}

.page-about .abt-gate__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .abt-gate__body ul {
  margin: 12px 0 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.page-about .abt-gate__body li {
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .abt-gate__body li::marker {
  color: var(--green);
}

.page-about .abt-gates__figure {
  margin: 0;
}

.page-about .abt-gates__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--line) solid var(--sand);
  box-shadow: var(--abt-shadow) var(--abt-shadow) 0 var(--red-bright);
  background: var(--ink-2);
  object-fit: cover;
}

.page-about .abt-gates__figure figcaption {
  color: rgba(251, 246, 236, .62);
}

/* ---------- 生态 ---------- */
.page-about .abt-eco__grid {
  display: grid;
  gap: 16px;
}

.page-about .abt-eco__item {
  border: var(--line) solid var(--ink);
  background: var(--gray);
  padding: 20px 18px 22px;
}

.page-about .abt-eco__num {
  display: block;
  font-family: var(--mono);
  font-weight: 800;
  font-size: clamp(28px, 4.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-about .abt-eco__label {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .abt-eco__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-3);
}

.page-about .abt-eco__foot {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 2px dashed var(--gray);
}

.page-about .abt-eco__footText {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .abt-batches {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .abt-batches li {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  padding: 7px 12px;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: transparent;
}

.page-about .abt-batches li:last-child {
  background: var(--ink);
  color: var(--green);
}

.page-about .abt-eco__contact {
  margin-top: 30px;
  border: var(--line) solid var(--ink);
  background: var(--warm);
  box-shadow: var(--abt-shadow) var(--abt-shadow) 0 var(--red);
  padding: 24px 20px 26px;
}

.page-about .abt-eco__contact p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-2);
  max-width: 60ch;
}

/* ---------- 下一步 ---------- */
.page-about .abt-next__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .abt-next__grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
  padding-right: 8px;
  padding-bottom: 8px;
}

.page-about .abt-next__card {
  display: block;
  text-decoration: none;
  border: var(--line) solid var(--ink);
  background: var(--warm);
  color: var(--ink);
  padding: 18px 18px 20px;
  box-shadow: 6px 6px 0 var(--ink);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.page-about .abt-next__card:hover {
  transform: translateY(-2px);
  box-shadow: 3px 3px 0 var(--ink);
  background: var(--gray);
}

.page-about .abt-next__card:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.page-about .abt-next__label {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--red);
}

.page-about .abt-next__name {
  display: block;
  margin-top: 10px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .abt-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .abt-gate:nth-child(2) {
    margin-left: 24px;
  }

  .page-about .abt-gate:nth-child(3) {
    margin-left: 48px;
  }

  .page-about .abt-gate:nth-child(4) {
    margin-left: 72px;
  }
}

@media (min-width: 900px) {
  .page-about .abt-claim__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .abt-team__layout {
    grid-template-columns: 5fr 7fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .abt-axis__svg {
    display: block;
  }

  .page-about .abt-stage-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }

  .page-about .abt-stage:nth-child(1) {
    margin-top: 28px;
  }

  .page-about .abt-stage:nth-child(3) {
    margin-top: 32px;
  }

  .page-about .abt-stage:nth-child(5) {
    margin-top: 26px;
  }

  .page-about .abt-lab__split {
    grid-template-columns: 5fr 7fr;
    gap: 42px;
    align-items: start;
  }

  .page-about .abt-lab__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 24px;
  }

  .page-about .abt-gates-layout {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 380px);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .abt-eco__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

/* ---------- 动效与降级 ---------- */
.page-about .abt-note,
.page-about .abt-next__card,
.page-about .abt-gate {
  will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .abt-note,
  .page-about .abt-next__card,
  .page-about .abt-gate {
    transition: none;
    will-change: auto;
  }

  .page-about .abt-note:hover,
  .page-about .abt-next__card:hover,
  .page-about .abt-gate:hover {
    transform: none;
  }
}
<<<END>>>