.page-about {
  --ab-pad: clamp(48px, 7vw, 96px);
  --ab-gap: clamp(24px, 3.4vw, 44px);
}

/* ---------- 通用排版块 ---------- */
.page-about .ab-head {
  max-width: 46em;
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .ab-h2 {
  font-family: var(--wd-serif);
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  font-weight: 700;
  margin: 12px 0 16px;
  color: var(--wd-ink);
}

.page-about .ab-h2--ink { color: var(--wd-paper); }

.page-about .ab-h3 {
  font-family: var(--wd-serif);
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.4;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--wd-ink);
}

.page-about .ab-lead {
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: #5C5347;
  max-width: 42em;
  margin: 0;
}

.page-about .ab-lead--ink { color: var(--wd-muted); }

.page-about .ab-body {
  font-size: 15px;
  line-height: 1.9;
  color: #4A4238;
  max-width: 44em;
  margin: 0 0 16px;
}

.page-about .ab-note {
  font-size: 13px;
  line-height: 1.7;
  color: #7A6E60;
  margin: 14px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(20px, 3vw, 36px) var(--ab-pad);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-hero__title {
  font-family: var(--wd-serif);
  font-size: clamp(29px, 4.4vw, 52px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  font-weight: 700;
  margin: 14px 0 20px;
  color: var(--wd-paper);
}

.page-about .ab-hero__intro {
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.92;
  color: var(--wd-muted);
  max-width: 40em;
  margin: 0 0 16px;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
}

.page-about .ab-hero__facts li {
  padding-left: 14px;
  border-left: 1px solid var(--wd-line);
}

.page-about .ab-hero__facts b {
  display: block;
  font-family: var(--wd-mono);
  font-size: clamp(19px, 2.3vw, 26px);
  font-weight: 700;
  color: var(--wd-copper-hi);
  letter-spacing: 0.01em;
  margin-bottom: 4px;
}

.page-about .ab-hero__facts span {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--wd-muted);
}

/* ---------- 索引卡 ---------- */
.page-about .ab-index {
  padding: clamp(20px, 2.6vw, 30px);
  border-radius: var(--wd-radius-lg);
  background: var(--wd-ink-2);
  border: 1px solid var(--wd-line);
  box-shadow: 10px 10px 0 -4px rgba(38, 32, 28, 0.9), 0 0 0 1px rgba(192, 138, 62, 0.1);
}

.page-about .ab-index__title {
  font-family: var(--wd-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--wd-paper);
  margin: 0 0 6px;
}

.page-about .ab-index__meta {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--wd-copper);
  margin: 0 0 18px;
  font-family: var(--wd-mono);
}

.page-about .ab-index__list {
  list-style: none;
  counter-reset: ab-idx;
  margin: 0 0 20px;
  padding: 0;
}

.page-about .ab-index__list li { counter-increment: ab-idx; }

.page-about .ab-index__list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--wd-paper);
  text-decoration: none;
  border-bottom: 1px dashed var(--wd-line-soft);
  transition: color 0.2s var(--wd-ease), padding-left 0.2s var(--wd-ease);
}

.page-about .ab-index__list a::before {
  content: counter(ab-idx, decimal-leading-zero);
  flex: none;
  font-family: var(--wd-mono);
  font-size: 11.5px;
  color: var(--wd-copper);
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  color: var(--wd-copper-hi);
  padding-left: 4px;
}

.page-about .ab-index__cta { width: 100%; justify-content: center; }

.page-about .ab-index__note {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--wd-muted);
  margin: 14px 0 0;
}

/* ---------- 栏目体系 ---------- */
.page-about .ab-structure {
  padding-block: var(--ab-pad);
  color: var(--wd-ink);
}

.page-about .ab-tree {
  background: var(--wd-ink);
  border: 1px solid var(--wd-line);
  border-radius: var(--wd-radius-lg);
  padding: clamp(16px, 3vw, 32px);
  margin-bottom: var(--ab-gap);
  box-shadow: inset 0 0 0 1px rgba(227, 183, 120, 0.08);
}

.page-about .ab-tree svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 660px;
  margin: 0 auto;
}

.page-about .ab-split {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

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

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

.page-about .ab-bars {
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3vw, 30px) 0 0;
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: minmax(96px, 128px) minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.page-about .ab-bar__label {
  font-size: 13px;
  color: #5C5347;
  line-height: 1.4;
}

.page-about .ab-bar__track {
  display: block;
  height: 14px;
  border-radius: var(--wd-radius-pill);
  background: rgba(192, 138, 62, 0.14);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--wd-radius-pill);
  background: linear-gradient(90deg, rgba(192, 138, 62, 0.55), var(--wd-copper));
}

.page-about .ab-bar__fill--hi {
  background: linear-gradient(90deg, var(--wd-copper), var(--wd-copper-hi));
}

.page-about .ab-bar__value {
  font-family: var(--wd-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--wd-ink);
  min-width: 2ch;
  text-align: right;
}

/* ---------- 变更说明 ---------- */
.page-about .ab-changes {
  padding-block: 0 var(--ab-pad);
  color: var(--wd-ink);
}

.page-about .ab-changes__grid {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--wd-line);
}

.page-about .ab-changes__body .wd-btn { margin-top: 10px; }

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

.page-about .ab-fold {
  border-radius: var(--wd-radius-md);
  border: 1px solid rgba(192, 138, 62, 0.34);
  background: rgba(255, 255, 255, 0.55);
  padding: 0 clamp(16px, 2.4vw, 22px);
  transition: border-color 0.24s var(--wd-ease), box-shadow 0.24s var(--wd-ease);
}

.page-about .ab-fold[open] {
  border-color: rgba(192, 138, 62, 0.62);
  box-shadow: 0 10px 24px -18px rgba(20, 16, 14, 0.8);
}

.page-about .ab-fold summary {
  cursor: pointer;
  padding: 16px 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--wd-ink);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

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

.page-about .ab-fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--wd-mono);
  font-size: 17px;
  color: var(--wd-copper);
  line-height: 1;
}

.page-about .ab-fold[open] summary::after { content: "–"; }

.page-about .ab-fold__body {
  padding: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: #4A4238;
}

.page-about .ab-fold__body p { margin: 0; }

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

.page-about .ab-pair__col {
  padding: 12px 14px;
  border-radius: var(--wd-radius-md);
  background: rgba(217, 125, 40, 0.09);
  border-left: 2px solid var(--wd-amber);
}

.page-about .ab-pair__col--after {
  background: rgba(78, 124, 106, 0.1);
  border-left-color: var(--wd-celadon);
}

.page-about .ab-pair__tag {
  display: inline-block;
  font-family: var(--wd-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #8A5518;
  margin-bottom: 6px;
}

.page-about .ab-pair__tag--after { color: #2C4A42; }

/* ---------- 团队与时间线 ---------- */
.page-about .ab-team {
  padding-block: var(--ab-pad);
}

.page-about .ab-team__banner {
  margin: 0 0 var(--ab-gap);
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-role {
  padding: clamp(20px, 2.6vw, 28px);
  border-radius: var(--wd-radius-lg);
  background: var(--wd-ink-2);
  border: 1px solid var(--wd-line);
  transition: transform 0.24s var(--wd-ease), border-color 0.24s var(--wd-ease);
}

.page-about .ab-role:hover {
  transform: translateY(-2px);
  border-color: var(--wd-line-strong);
}

.page-about .ab-role__num {
  display: block;
  font-family: var(--wd-mono);
  font-size: clamp(34px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--wd-copper-hi);
  letter-spacing: -0.02em;
}

.page-about .ab-role__unit {
  display: block;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--wd-celadon);
  margin: 8px 0 16px;
}

.page-about .ab-role__name {
  font-family: var(--wd-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--wd-paper);
  margin: 0 0 10px;
}

.page-about .ab-role__desc {
  font-size: 14px;
  line-height: 1.85;
  color: var(--wd-muted);
  margin: 0;
}

.page-about .ab-timeline {
  margin-top: clamp(40px, 5.5vw, 72px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--wd-line-soft);
}

.page-about .ab-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .ab-tabs__btn {
  font-family: var(--wd-sans);
  font-size: 14px;
  line-height: 1.4;
  padding: 9px 20px;
  border-radius: var(--wd-radius-pill);
  border: 1px solid var(--wd-line);
  background: transparent;
  color: var(--wd-muted);
  cursor: pointer;
  transition: background 0.2s var(--wd-ease), color 0.2s var(--wd-ease), border-color 0.2s var(--wd-ease);
}

.page-about .ab-tabs__btn:hover {
  color: var(--wd-copper-hi);
  border-color: var(--wd-line-strong);
}

.page-about .ab-tabs__btn[aria-selected="true"] {
  background: var(--wd-celadon);
  border-color: var(--wd-celadon);
  color: #10160F;
  font-weight: 600;
}

.page-about .ab-tabs__panel {
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--wd-line);
  position: relative;
}

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

.page-about .ab-tabs__panel::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 12px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--wd-copper);
  box-shadow: 0 0 0 4px rgba(192, 138, 62, 0.16);
}

.page-about .ab-stage__label {
  font-family: var(--wd-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--wd-copper-hi);
  margin: 0 0 10px;
}

.page-about .ab-stage__text {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--wd-muted);
  max-width: 44em;
  margin: 0;
}

/* ---------- 合规 ---------- */
.page-about .ab-compliance {
  padding-block: var(--ab-pad);
  color: var(--wd-ink);
}

/* ---------- 结尾导流 ---------- */
.page-about .ab-cta {
  padding-block: clamp(36px, 5vw, 64px);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 920px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }

  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }

  .page-about .ab-changes__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
}

@media (max-width: 419px) {
  .page-about .ab-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-bar {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px 10px;
  }

  .page-about .ab-bar__track {
    grid-column: 1 / -1;
    order: 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-fold,
  .page-about .ab-tabs__btn,
  .page-about .ab-index__list a {
    transition: none;
  }

  .page-about .ab-role:hover { transform: none; }
}
<<<END>>>