.page-about {
  --ab-teal-deep: #0B302E;
  --ab-ink-text: #3A434F;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 1.4rem 0 3.2rem;
  background:
    radial-gradient(120% 95% at 88% 0%, rgba(245, 183, 0, 0.16), transparent 58%),
    var(--ink);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: 7%;
  top: -8%;
  width: 1px;
  height: 122%;
  transform: rotate(15deg);
  background: linear-gradient(180deg, transparent, var(--line-gold), transparent);
  pointer-events: none;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -16%;
  top: -34%;
  width: 54%;
  height: 172%;
  transform: rotate(15deg);
  background: linear-gradient(180deg, rgba(245, 183, 0, 0.2), rgba(245, 183, 0, 0) 72%);
  pointer-events: none;
}
.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}
.page-about .ab-hero__title {
  margin: 0.85rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.9rem, 6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.03em;
  color: var(--mist);
}
.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--gold);
}
.page-about .ab-hero__text {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .ab-dossier {
  align-self: end;
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(27, 32, 41, 0.82);
  box-shadow: var(--shadow-plate);
  backdrop-filter: blur(3px);
}
.page-about .ab-dossier__head {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .ab-dossier__list {
  margin: 0;
}
.page-about .ab-dossier__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.9rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-dossier__row:last-child {
  border-bottom: 0;
}
.page-about .ab-dossier__row dt {
  font-size: 0.8rem;
  color: var(--gray);
  white-space: nowrap;
}
.page-about .ab-dossier__row dd {
  margin: 0;
  font-size: 0.82rem;
  color: var(--mist);
  letter-spacing: 0.04em;
  text-align: right;
}

/* 主体骨架 */
.page-about .ab-body {
  padding: 3rem 0 4rem;
}
.page-about .wk-shell {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 2.6rem;
  align-items: start;
}
.page-about .wk-shell__side {
  position: sticky;
  top: 5.5rem;
  align-self: start;
}
.page-about .ab-side__plate {
  margin: 0 0 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-soft);
}
.page-about .ab-side__plate img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.page-about .ab-side__plate figcaption {
  padding: 0.55rem 0.8rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--gray);
}

.page-about .wk-rail__link {
  display: block;
  padding: 0.45rem 0 0.45rem 0.9rem;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--silver);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .wk-rail__link:hover {
  color: var(--gold-hi);
}
.page-about .wk-rail__link[data-active="true"] {
  color: var(--gold);
  border-left-color: var(--gold);
}

/* 章节通用 */
.page-about .ab-section {
  padding-bottom: 3.2rem;
}
.page-about .wk-section__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--mist);
  margin-top: 0.5rem;
}
.page-about .ab-intro {
  margin: 0.9rem 0 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--silver);
}
.page-about .ab-note {
  margin: 1.1rem 0 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--line-gold);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--gray);
}

/* 时间线 */
.page-about .ab-tl__track {
  position: relative;
  margin-top: 1.7rem;
  padding-left: 1.6rem;
}
.page-about .ab-tl__track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--line-gold), var(--line-soft));
}
.page-about .ab-node {
  position: relative;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.05rem;
  width: 11px;
  height: 11px;
  border: 1px solid var(--line-gold);
  border-radius: 2px;
  background: var(--ink);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}
.page-about .ab-node[open]::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 183, 0, 0.14);
}
.page-about .ab-node__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.95rem;
  padding: 0.95rem 0;
  cursor: pointer;
  list-style: none;
}
.page-about .ab-node__head::-webkit-details-marker {
  display: none;
}
.page-about .ab-node__year {
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  font-weight: 600;
  letter-spacing: 0.07em;
  color: var(--gold);
}
.page-about .ab-node__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-about .ab-node__head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--gray);
}
.page-about .ab-node[open] .ab-node__head::after {
  content: "–";
  color: var(--gold);
}
.page-about .ab-node__body p {
  margin: 0 0 1rem;
  max-width: 64ch;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--silver);
}

/* 团队分工 */
.page-about .ab-split {
  display: grid;
  gap: 1.6rem;
  margin-top: 1.5rem;
}
.page-about .ab-crew {
  display: grid;
  gap: 0.85rem;
}
.page-about .ab-crew__item {
  position: relative;
  padding: 1rem 1.05rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-soft);
  box-shadow: var(--shadow-plate);
}
.page-about .ab-crew__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 15px;
  height: 15px;
  border-left: 1px solid var(--gold);
  border-top: 1px solid var(--gold);
  border-top-left-radius: var(--radius);
}
.page-about .ab-crew__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  line-height: 1;
  color: var(--gold);
}
.page-about .ab-crew__num .wk-num {
  font-size: clamp(1.7rem, 4.4vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.page-about .ab-crew__unit {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold-deep);
}
.page-about .ab-crew__title {
  margin: 0.45rem 0 0.3rem;
  font-family: var(--font-head);
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--mist);
}
.page-about .ab-crew__text {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .ab-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-soft);
}
.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}
.page-about .ab-media figcaption {
  padding: 0.6rem 0.9rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--gray);
}

/* 五步方法 */
.page-about .ab-steps {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.page-about .ab-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.3rem 1rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(90deg, rgba(245, 183, 0, 0.055), transparent 46%);
}
.page-about .ab-step__no {
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 0.15rem;
}
.page-about .ab-step__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-head);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-about .ab-step__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--silver);
}
.page-about .ab-step__meta {
  grid-column: 2;
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  color: var(--blue-soft);
  white-space: nowrap;
}

/* 资质与协作 */
.page-about .ab-trust {
  background: linear-gradient(150deg, var(--teal), var(--ab-teal-deep) 68%);
  border: 1px solid rgba(201, 206, 214, 0.14);
  border-radius: var(--radius);
  padding: 1.6rem 1.25rem 1.8rem;
}
.page-about .ab-trust .wk-eyebrow {
  color: var(--gold-hi);
}
.page-about .ab-trust .wk-section__title {
  color: var(--mist);
}
.page-about .ab-trust__layout {
  display: grid;
  gap: 1.35rem;
  margin-top: 1.5rem;
}
.page-about .ab-trust__cards {
  display: grid;
  gap: 0.8rem;
}
.page-about .ab-trust__card {
  padding: 0.95rem 1rem 1.05rem;
  border-radius: var(--radius);
  background: var(--mist);
  box-shadow: var(--shadow-plate);
}
.page-about .ab-trust__card h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .ab-trust__card p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--ab-ink-text);
}

.page-about .ab-trust__media {
  margin: 0;
  border: 1px solid rgba(201, 206, 214, 0.2);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(12, 14, 18, 0.5);
}
.page-about .ab-trust__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .ab-trust__media figcaption {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid rgba(201, 206, 214, 0.16);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  color: var(--silver);
}

/* 服务规模 */
.page-about .ab-scale {
  display: grid;
  gap: 1px;
  margin-top: 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}
.page-about .ab-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.2rem 1.05rem 1.3rem;
  background: var(--ink-soft);
}
.page-about .ab-scale__num {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}
.page-about .ab-scale__lab {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--silver);
}
.page-about .ab-scale__note {
  margin: 1.1rem 0 0;
  max-width: 66ch;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--gray);
}

/* 下一步 */
.page-about .ab-next {
  position: relative;
  padding: 1.8rem 1.25rem 1.9rem;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background:
    radial-gradient(110% 140% at 100% 0%, rgba(47, 107, 255, 0.16), transparent 62%),
    var(--ink-soft);
}
.page-about .ab-next::before {
  content: "";
  position: absolute;
  left: 1.25rem;
  right: 1.25rem;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}
.page-about .ab-next__title {
  margin: 0.5rem 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.025em;
  color: var(--mist);
}
.page-about .ab-next__text {
  margin: 0.8rem 0 0;
  max-width: 56ch;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--silver);
}
.page-about .ab-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.3rem;
}
.page-about .ab-next__meta {
  margin: 1.15rem 0 0;
  font-size: 0.8rem;
  line-height: 1.85;
  color: var(--gray);
}
.page-about .ab-next__meta a {
  color: var(--blue-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 168, 255, 0.4);
}
.page-about .ab-next__meta a:hover {
  color: var(--gold-hi);
  border-bottom-color: var(--line-gold);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .ab-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-trust__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-step {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: start;
    gap: 0.2rem 1.1rem;
  }
  .page-about .ab-step__meta {
    grid-column: auto;
    grid-row: 1;
    align-self: center;
  }
  .page-about .ab-next {
    padding: 2.2rem 2rem 2.3rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 1.8rem 0 4rem;
  }
  .page-about .ab-hero__grid {
    grid-template-columns: 1.35fr 0.65fr;
    gap: 2.8rem;
  }
  .page-about .ab-split {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 1.8rem;
  }
  .page-about .ab-trust {
    padding: 2rem 1.9rem 2.1rem;
  }
  .page-about .ab-trust__layout {
    grid-template-columns: 1.25fr 0.75fr;
    align-items: start;
    gap: 1.6rem;
  }
  .page-about .ab-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .page-about .wk-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.6rem;
  }
  .page-about .wk-shell__side {
    position: static;
  }
  .page-about .ab-side__plate {
    max-width: 220px;
  }
  .page-about .wk-rail {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
  }
  .page-about .wk-rail__head {
    width: 100%;
    margin-bottom: 0.2rem;
  }
  .page-about .wk-rail__link {
    border-left: 0;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    padding: 0.32rem 0.7rem;
    font-size: 0.72rem;
  }
  .page-about .wk-rail__link[data-active="true"] {
    border-color: var(--gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .wk-rail__link,
  .page-about .ab-node::before {
    transition: none;
  }
}
<<<END>>>