.page-about {
  --ab-line: var(--hairline);
  --ab-line-strong: var(--hairline-strong);
  --ab-gold-line: var(--gold-line);
  --ab-rail-w: 200px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(24px, 4vw, 44px) 0 clamp(48px, 8vw, 96px);
  background:
    linear-gradient(165deg, rgba(92, 21, 38, 0.07), rgba(92, 21, 38, 0) 52%),
    var(--paper);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3.5vw, 38px);
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--slate-soft);
}
.page-about .breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease) 0.2s, border-color var(--ease) 0.2s;
}
.page-about .breadcrumb a:hover {
  color: var(--wine);
  border-bottom-color: var(--wine);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 32px);
}
.page-about .ab-hero__aside {
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-about .ab-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--slate);
  text-transform: uppercase;
}
.page-about .ab-kicker--gold {
  color: var(--gold-soft);
  margin-top: 0;
}

.page-about .ab-hero__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(31px, 5.4vw, 62px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(18px, 2.5vw, 26px);
  color: var(--ink);
}

.page-about .ab-lede {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--ink-2);
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 64ch;
}

.page-about .ab-num {
  display: inline-block;
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.12em;
  line-height: 1.3;
  color: var(--ivory);
  background: var(--wine);
  padding: 5px 11px;
}
.page-about .ab-hero__aside .ab-num {
  font-size: 20px;
  padding: 7px 14px;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
.page-about .ab-facts > li {
  background: var(--ivory);
  padding: 16px 14px 15px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}
.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.15;
  color: var(--wine);
  letter-spacing: -0.01em;
}
.page-about .ab-facts__num em {
  font-style: normal;
  color: var(--gold);
  font-size: 0.7em;
}
.page-about .ab-facts__label {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-section {
  padding: clamp(44px, 7vw, 92px) 0;
  border-top: 1px solid var(--ab-line);
}
.page-about .ab-section--ivory {
  background: var(--ivory);
}
.page-about .ab-section--price {
  background:
    linear-gradient(180deg, rgba(92, 21, 38, 0.07), rgba(92, 21, 38, 0) 46%),
    var(--paper);
}

.page-about .ab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}
.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-rail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.page-about .ab-rail__title {
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.1vw, 24px);
  font-weight: 700;
  line-height: 1.3;
  margin: 0;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.page-about .ab-rail__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 图 ---------- */
.page-about .ab-figure {
  margin: 0 0 clamp(26px, 4vw, 40px);
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-line);
  background: var(--slate-soft);
}
.page-about .ab-figure__cap {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--gold);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-tl {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 22px 0 22px 28px;
  border-top: 1px solid var(--ab-line);
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transition: background var(--ease) 0.2s, transform var(--ease) 0.2s;
}
.page-about .ab-tl::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 39px;
  bottom: -30px;
  width: 1px;
  background: var(--ab-gold-line);
}
.page-about .ab-tl:last-child::after {
  content: none;
}
.page-about .ab-tl:hover::before {
  background: var(--wine);
  transform: scale(1.25);
}
.page-about .ab-tl__ver {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.08em;
  color: var(--wine);
  background: rgba(199, 154, 59, 0.16);
  padding: 2px 9px;
  line-height: 1.5;
}
.page-about .ab-tl__body {
  min-width: 0;
}
.page-about .ab-tl__title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: 0.01em;
}
.page-about .ab-tl__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 40px);
}
.page-about .ab-roles {
  display: grid;
  gap: 14px;
  min-width: 0;
}
.page-about .ab-role {
  background: var(--ivory);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--wine);
  padding: 20px 20px 22px;
  transition: border-left-color var(--ease) 0.2s, transform var(--ease) 0.25s;
}
.page-about .ab-role:nth-child(2) {
  border-left-color: var(--gold);
}
.page-about .ab-role:nth-child(3) {
  border-left-color: var(--slate);
}
.page-about .ab-role:hover {
  transform: translateY(-3px);
}
.page-about .ab-role__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--slate);
  margin-bottom: 8px;
}
.page-about .ab-role__title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}
.page-about .ab-role__title span {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--wine);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}
.page-about .ab-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-2);
}
.page-about .ab-team__figure {
  margin-bottom: 0;
}

/* ---------- 价格表 ---------- */
.page-about .ab-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: clamp(24px, 3vw, 34px);
}
.page-about .ab-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: 14.5px;
}
.page-about .ab-table thead th {
  background: var(--wine);
  color: var(--ivory);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-align: left;
  padding: 11px 13px;
  white-space: nowrap;
}
.page-about .ab-table tbody th,
.page-about .ab-table tbody td {
  border-bottom: 1px solid var(--ab-line);
  padding: 15px 13px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}
.page-about .ab-table tbody th {
  font-weight: 500;
  white-space: nowrap;
  color: var(--ink);
}
.page-about .ab-table tbody td {
  color: var(--ink-2);
}
.page-about .ab-table tbody tr:hover td,
.page-about .ab-table tbody tr:hover th {
  background: rgba(199, 154, 59, 0.09);
}
.page-about .ab-price {
  font-family: var(--font-mono);
  color: var(--wine) !important;
  white-space: nowrap;
  font-size: 15px;
}
.page-about .ab-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  vertical-align: 1px;
}
.page-about .ab-dot--a {
  background: var(--gold);
}
.page-about .ab-dot--b {
  background: var(--slate);
}
.page-about .ab-dot--c {
  background: var(--slate-soft);
}

.page-about .ab-notes h3 {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 12px;
}
.page-about .ab-notes ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .ab-notes li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-2);
}
.page-about .ab-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--gold);
}

.page-about .ab-text-note {
  margin: clamp(18px, 2.5vw, 26px) 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--slate);
  background: rgba(110, 132, 133, 0.08);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 流程四步 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
.page-about .ab-step {
  position: relative;
  background: var(--ivory);
  padding: 20px 18px 16px;
  transition: background var(--ease) 0.2s, box-shadow var(--ease) 0.2s;
}
.page-about .ab-step:hover {
  background: #ffffff;
  box-shadow: inset 3px 0 0 var(--wine);
}
.page-about .ab-step__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 14px;
}
.page-about .ab-step__title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}
.page-about .ab-step p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}
.page-about .ab-step__time {
  display: block;
  width: 100%;
  padding-top: 9px;
  border-top: 1px solid var(--ab-line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 规模 ---------- */
.page-about .ab-scale {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
.page-about .ab-scale__item {
  background: var(--ivory);
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}
.page-about .ab-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.2vw, 44px);
  line-height: 1;
  color: var(--wine);
  letter-spacing: -0.02em;
}
.page-about .ab-scale__num em {
  font-style: normal;
  font-size: 0.55em;
  color: var(--gold);
}
.page-about .ab-scale__cap {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .ab-scale__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  background: var(--wine-deep);
  color: var(--ivory);
  border-top: 3px solid var(--gold);
  padding: clamp(46px, 7vw, 88px) 0 clamp(34px, 5vw, 60px);
}
.page-about .ab-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 36px);
}
.page-about .ab-cta h2 {
  font-family: var(--font-serif);
  font-size: clamp(23px, 3.3vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  margin: 12px 0 14px;
  color: var(--ivory);
}
.page-about .ab-cta p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(251, 247, 239, 0.78);
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .ab-cta .btn--ghost {
  border-color: rgba(231, 201, 126, 0.55);
  color: var(--gold-soft);
}
.page-about .ab-cta .btn--ghost:hover {
  border-color: var(--gold-soft);
  background: rgba(231, 201, 126, 0.12);
}
.page-about .ab-quick {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(231, 201, 126, 0.28);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
}
.page-about .ab-quick a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(251, 247, 239, 0.72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease) 0.2s, border-color var(--ease) 0.2s;
}
.page-about .ab-quick a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

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

@media (min-width: 760px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-tl {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 26px;
    gap: 0 26px;
    padding-left: 30px;
  }
  .page-about .ab-tl::before {
    left: 0;
    top: 32px;
  }
  .page-about .ab-tl::after {
    left: 4px;
    top: 41px;
    bottom: -32px;
  }
  .page-about .ab-tl__ver {
    margin-top: 2px;
  }
}

@media (min-width: 880px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 56px);
  }
  .page-about .ab-hero__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 10px;
  }
  .page-about .ab-grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
  .page-about .ab-rail {
    position: sticky;
    top: 118px;
    align-self: start;
    padding-left: 18px;
    border-left: 1px solid var(--ab-line-strong);
  }
  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    column-gap: 44px;
  }
  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
    column-gap: clamp(28px, 3.5vw, 44px);
  }
  .page-about .ab-role:nth-child(1) {
    margin-left: 0;
  }
  .page-about .ab-role:nth-child(2) {
    margin-left: 30px;
  }
  .page-about .ab-role:nth-child(3) {
    margin-left: 60px;
  }
  .page-about .ab-team__figure {
    position: sticky;
    top: 118px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-step,
  .page-about .ab-tl::before,
  .page-about .ab-quick a {
    transition: none;
  }
  .page-about .ab-role:hover {
    transform: none;
  }
}
<<<END>>>