.page-about {
  display: block;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 56px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(14, 24, 48, 0) 0 62%, var(--ink-2) 62% 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(34px, 7.4vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-body {
  display: grid;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 72px;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  display: grid;
  gap: 68px;
  min-width: 0;
}

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: calc(var(--topline-h) + 24px);
}

.page-about .about-section__title {
  margin: 10px 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 33px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-section__lead {
  margin: 0 0 26px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* 版本演进：三层错位卡片 */
.page-about .version-stack {
  display: grid;
  gap: 18px;
}

.page-about .version-card {
  position: relative;
  isolation: isolate;
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--violet);
}

.page-about .version-card::after {
  content: "";
  position: absolute;
  inset: 7px -7px -7px 7px;
  z-index: -1;
  border: 1px solid var(--line);
  pointer-events: none;
}

.page-about .version-card--v2 {
  border-left-color: var(--sand);
}

.page-about .version-card--v3 {
  border-left-color: var(--cyan);
}

.page-about .version-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .version-card__season {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .version-card__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.25;
  color: var(--white);
}

.page-about .version-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .version-card__list {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .version-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .version-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .version-card--v1 .version-card__list li::before {
  background: var(--violet);
}

.page-about .version-card--v2 .version-card__list li::before {
  background: var(--sand);
}

/* 改版说明 */
.page-about .revamp {
  display: grid;
  gap: 26px;
  padding: 24px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .revamp__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--white);
}

.page-about .revamp__layers {
  display: grid;
  gap: 12px;
}

.page-about .layer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 14px 15px;
  background: var(--ink);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
}

.page-about .layer__idx {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .layer__name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .layer__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .revamp__figure {
  margin: 0;
  min-width: 0;
}

.page-about .revamp__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .feedback {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .feedback__item {
  padding-top: 12px;
  border-top: 2px solid var(--orange);
}

.page-about .feedback__tag {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .feedback__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* 团队分工 */
.page-about .squad-grid {
  display: grid;
  gap: 14px;
}

.page-about .squad {
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .squad:hover,
.page-about .squad:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .squad__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .squad:nth-child(2) .squad__num {
  color: var(--sand);
}

.page-about .squad:nth-child(3) .squad__num {
  color: var(--violet);
}

.page-about .squad:nth-child(4) .squad__num {
  color: var(--orange);
}

.page-about .squad__name {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.25;
  color: var(--white);
}

.page-about .squad__role {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .squad__list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .squad__list li {
  position: relative;
  padding-left: 13px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .squad__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 5px;
  height: 5px;
  background: var(--line);
}

.page-about .squads__figure {
  margin: 20px 0 0;
  min-width: 0;
}

.page-about .squads__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 校验流程 */
.page-about .check-flow {
  display: grid;
  gap: 22px;
}

.page-about .check-node {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
}

.page-about .check-node:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .check-node:nth-child(3) {
  border-top-color: var(--sand);
}

.page-about .check-node__step {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .check-node__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--white);
}

.page-about .check-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* 合作与覆盖 */
.page-about .reach-grid {
  display: grid;
  gap: 16px;
}

.page-about .reach-card {
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-bottom: 2px solid var(--sand);
}

.page-about .reach-card--alt {
  border-bottom-color: var(--cyan);
}

.page-about .reach-card__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

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

.page-about .reach-list li {
  display: grid;
  grid-template-columns: minmax(58px, auto) minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.page-about .reach-list__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}

.page-about .reach-card--alt .reach-list__num {
  color: var(--cyan);
}

.page-about .reach-list__text {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* 成果 */
.page-about .record-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ticket {
  display: inline-block;
  padding: 12px 16px;
  background: var(--ink-2);
  border: 1px dashed var(--sand);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  line-height: 1.5;
  color: var(--sand);
}

.page-about .record-note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* 结尾行动区 */
.page-about .about-cta {
  padding: 30px 22px 32px;
  background: linear-gradient(122deg, var(--ink-2) 0%, var(--panel) 100%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 28px);
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

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

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .feedback {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero::before {
    background: linear-gradient(116deg, rgba(14, 24, 48, 0) 0 46%, var(--ink-2) 46% 100%);
  }

  .page-about .about-hero {
    padding: 32px 0 68px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .revamp {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 34px;
    padding: 32px 30px;
    align-items: start;
  }

  .page-about .check-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .check-node:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -18px;
    top: 40px;
    border: 7px solid transparent;
    border-left-color: var(--cyan);
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 52px;
    padding-top: 72px;
    padding-bottom: 96px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--topline-h) + 28px);
    padding-left: 18px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__title {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--mist);
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 2px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .page-about .about-rail__link {
    display: flex;
    gap: 10px;
    align-items: baseline;
    padding: 10px 0;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--mist);
    text-decoration: none;
    border-bottom: 1px dashed var(--line);
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
  }

  .page-about .about-rail__idx {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--line);
    transition: color 0.2s var(--ease);
  }

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

  .page-about .about-rail__note {
    margin: 20px 0 0;
    font-size: 12.5px;
    line-height: 1.7;
    color: var(--mist);
  }

  .page-about .about-flow {
    gap: 92px;
  }

  .page-about .version-card {
    padding: 26px 24px 28px;
  }

  .page-about .version-card:nth-child(2) {
    margin-left: 36px;
  }

  .page-about .version-card:nth-child(3) {
    margin-left: 72px;
  }
}

@media (min-width: 1024px) {
  .page-about .squad-grid {
    grid-template-columns: 1.38fr 1fr 0.92fr 1.14fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .squad,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .squad:hover,
  .page-about .squad:focus-within {
    transform: none;
  }
}
<<<END>>>