.page-about {
  --ab-panel: rgba(244, 239, 228, 0.07);
  --ab-line: 3px solid var(--gold);
  background: var(--paper);
  color: var(--brown);
  font-family: var(--sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 30px) 0 clamp(46px, 7vw, 84px);
  color: var(--paper);
  background:
    radial-gradient(circle at 88% 6%, rgba(53, 224, 208, 0.22), transparent 52%),
    radial-gradient(circle at 5% 94%, rgba(227, 179, 65, 0.16), transparent 46%),
    linear-gradient(155deg, var(--ink) 0%, var(--ink-deep) 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--gold), var(--orange) 48%, var(--cyan));
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero .crumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
  color: rgba(244, 239, 228, 0.6);
}

.page-about .ab-hero .crumbs a {
  color: var(--cyan);
}

.page-about .ab-hero__eyebrow {
  display: inline-block;
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: var(--t8);
  letter-spacing: 0.34em;
  color: var(--cyan);
  border: 1px solid rgba(53, 224, 208, 0.5);
}

.page-about .ab-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 18em;
  font-size: var(--t1);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__lead {
  margin: 0 0 clamp(26px, 4vw, 42px);
  max-width: 36em;
  font-size: var(--t5);
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.86);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.2vw, 22px);
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: clamp(16px, 2.4vw, 24px) 0;
  list-style: none;
  border-top: 1px solid rgba(244, 239, 228, 0.22);
  border-bottom: 1px solid rgba(244, 239, 228, 0.22);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .ab-stat__unit {
  margin-left: 2px;
  font-size: 0.48em;
  color: var(--orange);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--t7);
  letter-spacing: 0.04em;
  color: rgba(244, 239, 228, 0.72);
}

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

/* ---------- 主体骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: var(--t8);
  letter-spacing: 0.3em;
  color: var(--graphite);
}

.page-about .ab-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: var(--t7);
  white-space: nowrap;
  text-decoration: none;
  color: var(--brown);
  background: var(--paper);
  border: var(--stroke);
  transition: transform 160ms linear, box-shadow 160ms linear, background-color 160ms linear;
}

.page-about .ab-index__link .num {
  font-size: var(--t8);
  color: var(--graphite);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  background: var(--gold);
  box-shadow: var(--shadow-orange);
  transform: translate(-2px, -2px);
}

.page-about .ab-flow {
  display: grid;
  gap: clamp(40px, 6vw, 88px);
}

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding-top: clamp(18px, 3vw, 30px);
  border-top: var(--ab-line);
}

.page-about .ab-chapter--ink {
  padding: clamp(26px, 4.4vw, 52px);
  color: var(--paper);
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-top: 3px solid var(--gold);
  box-shadow: var(--shadow-gold);
}

.page-about .ab-chapter__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(46px, 9vw, 92px);
  font-weight: 700;
  line-height: 0.8;
  color: var(--paper-2);
}

.page-about .ab-chapter--ink .ab-chapter__num {
  color: rgba(244, 239, 228, 0.2);
}

.page-about .ab-chapter__tag {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: var(--t8);
  letter-spacing: 0.3em;
  color: var(--graphite);
}

.page-about .ab-chapter--ink .ab-chapter__tag {
  color: var(--cyan);
}

.page-about .ab-chapter__title {
  margin: clamp(8px, 1.4vw, 14px) 0 clamp(16px, 2.4vw, 26px);
  max-width: 22em;
  font-size: var(--t2);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .ab-chapter__body p {
  margin: 0 0 1.1em;
  max-width: 38em;
  font-size: var(--t5);
  line-height: 1.85;
}

.page-about .ab-chapter--ink .ab-chapter__body p {
  color: rgba(244, 239, 228, 0.88);
}

.page-about .ab-chapter__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 条目列表 ---------- */
.page-about .ab-list {
  display: grid;
  gap: 10px;
  margin: 0 0 1.4em;
  padding: 0;
  max-width: 40em;
  list-style: none;
}

.page-about .ab-list li {
  position: relative;
  padding-left: 22px;
  font-size: var(--t6);
  line-height: 1.8;
}

.page-about .ab-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 10px;
  background: var(--gold);
  box-shadow: 2px 2px 0 var(--orange);
}

.page-about .ab-list strong {
  color: var(--ink);
}

.page-about .ab-chapter--ink .ab-list strong {
  color: var(--gold);
}

/* ---------- 左右分区 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .ab-persona {
  padding-top: clamp(14px, 2vw, 20px);
  margin-bottom: clamp(16px, 2.2vw, 24px);
  border-top: var(--hair);
}

.page-about .ab-persona h3 {
  margin: 0 0 8px;
  font-size: var(--t4);
  font-weight: 800;
}

.page-about .ab-persona p {
  margin: 0;
  max-width: 36em;
  font-size: var(--t6);
  line-height: 1.85;
  color: var(--brown);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink);
  border: var(--stroke);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-chapter--ink .ab-figure img {
  border-color: var(--gold);
  box-shadow: 8px 8px 0 rgba(227, 179, 65, 0.26);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: var(--t8);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--graphite);
}

.page-about .ab-chapter--ink .ab-figure figcaption {
  color: rgba(244, 239, 228, 0.64);
}

/* ---------- 三条选题线 ---------- */
.page-about .ab-pillars {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-pillars__item {
  padding-top: 14px;
  border-top: 3px solid var(--gold);
}

.page-about .ab-pillars__item h3 {
  margin: 0 0 8px;
  font-size: var(--t4);
  font-weight: 800;
}

.page-about .ab-pillars__item p {
  margin: 0;
  font-size: var(--t6);
  line-height: 1.85;
  color: var(--brown);
}

/* ---------- 团队切换 ---------- */
.page-about .ab-tabs {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .ab-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(16px, 2.2vw, 24px);
}

.page-about .ab-tabs__label {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 16px;
  font-size: var(--t7);
  letter-spacing: 0.04em;
  color: var(--paper);
  border: 2px solid rgba(244, 239, 228, 0.34);
  cursor: pointer;
  transition: background-color 160ms linear, color 160ms linear, transform 160ms linear;
}

.page-about .ab-tabs__label .num {
  color: var(--cyan);
}

.page-about .ab-tabs__label:hover {
  border-color: var(--gold);
}

.page-about .ab-tabs__panel {
  display: none;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ab-panel);
  border-left: 3px solid var(--cyan);
}

.page-about .ab-tabs__panel h3 {
  margin: 0 0 10px;
  font-size: var(--t4);
  font-weight: 800;
  color: var(--gold);
}

.page-about .ab-tabs__panel p {
  margin: 0;
  max-width: 38em;
  font-size: var(--t6);
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.88);
}

.page-about #ab-team-1:checked ~ .ab-tabs__bar .ab-tabs__label[for="ab-team-1"],
.page-about #ab-team-2:checked ~ .ab-tabs__bar .ab-tabs__label[for="ab-team-2"],
.page-about #ab-team-3:checked ~ .ab-tabs__bar .ab-tabs__label[for="ab-team-3"] {
  color: var(--ink-deep);
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: var(--shadow-orange);
  transform: translate(-2px, -2px);
}

.page-about #ab-team-1:checked ~ .ab-tabs__bar .ab-tabs__label[for="ab-team-1"] .num,
.page-about #ab-team-2:checked ~ .ab-tabs__bar .ab-tabs__label[for="ab-team-2"] .num,
.page-about #ab-team-3:checked ~ .ab-tabs__bar .ab-tabs__label[for="ab-team-3"] .num {
  color: var(--ink-deep);
}

.page-about #ab-team-1:checked ~ .ab-tabs__panels > .ab-tabs__panel:nth-child(1),
.page-about #ab-team-2:checked ~ .ab-tabs__panels > .ab-tabs__panel:nth-child(2),
.page-about #ab-team-3:checked ~ .ab-tabs__panels > .ab-tabs__panel:nth-child(3) {
  display: block;
}

/* ---------- 阶段线 ---------- */
.page-about .ab-stages {
  display: grid;
  gap: 12px;
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-stage {
  background: var(--paper);
  border: var(--stroke);
  box-shadow: 4px 4px 0 var(--paper-2);
}

.page-about .ab-stage[open] {
  border-color: var(--gold);
  box-shadow: var(--shadow-orange);
}

.page-about .ab-stage__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 18px;
  font-size: var(--t5);
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-stage__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-stage__idx {
  font-size: var(--t7);
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ab-stage__name {
  flex: 1 1 auto;
}

.page-about .ab-stage__hint {
  font-family: var(--mono);
  font-size: var(--t8);
  letter-spacing: 0.16em;
  color: var(--graphite);
}

.page-about .ab-stage__body {
  padding: 0 18px 18px;
}

.page-about .ab-stage__body p {
  margin: 0;
  max-width: 38em;
  font-size: var(--t6);
  line-height: 1.85;
  color: var(--brown);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin: clamp(20px, 3vw, 32px) 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-partners__item {
  padding: clamp(14px, 1.8vw, 20px) 0 clamp(16px, 2.2vw, 22px);
  border-bottom: var(--hair);
}

.page-about .ab-partners__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-partners__unit {
  font-size: 0.42em;
  margin-left: 2px;
  color: var(--graphite);
}

.page-about .ab-partners__item h3 {
  margin: 8px 0 8px;
  font-size: var(--t5);
  font-weight: 800;
}

.page-about .ab-partners__item p {
  margin: 0;
  max-width: 34em;
  font-size: var(--t6);
  line-height: 1.8;
  color: var(--brown);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  padding: clamp(40px, 6vw, 80px) 0;
  color: var(--paper);
  border-top: 3px solid var(--gold);
  background: linear-gradient(150deg, var(--ink-deep) 0%, var(--ink) 62%, #12294F 100%);
}

.page-about .ab-cta__title {
  margin: 0 0 clamp(12px, 2vw, 18px);
  max-width: 20em;
  font-size: var(--t2);
  font-weight: 900;
  line-height: 1.15;
}

.page-about .ab-cta__lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 36em;
  font-size: var(--t5);
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.84);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-partners__item:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .ab-partners__item:nth-child(3) {
    margin-top: 60px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: start;
    gap: clamp(28px, 3.6vw, 48px);
  }

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

  .page-about .ab-pillars__item:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .ab-pillars__item:nth-child(3) {
    margin-top: 64px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-layout {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 108px;
  }

  .page-about .ab-index__list {
    display: block;
    overflow: visible;
  }

  .page-about .ab-index__list li + li {
    margin-top: 8px;
  }

  .page-about .ab-index__link {
    display: flex;
    width: 100%;
  }

  .page-about .ab-chapter__tag {
    position: absolute;
    left: -40px;
    top: 0;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
  }

  .page-about .ab-figure--portrait img {
    aspect-ratio: 9 / 7;
  }

  .page-about .ab-figure--wide img {
    aspect-ratio: 5 / 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-tabs__label {
    transition: none;
  }
}
<<<END>>>