.page-about {
  --ab-pad: clamp(18px, 4vw, 44px);
  --ab-soft: rgba(234, 246, 240, 0.78);
  --ab-cut: 12px;
  background: var(--dt-bg);
  color: var(--dt-paper);
  font-family: var(--dt-font-body);
}

/* ---------- 首屏 ---------- */
.page-about .ab-top {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) var(--ab-pad) clamp(32px, 5vw, 62px);
  border-bottom: 1px solid var(--dt-line);
  background-image:
    linear-gradient(to right, var(--dt-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--dt-line-soft) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: -1px -1px;
}

.page-about .ab-top::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: 62%;
  height: 180%;
  background: linear-gradient(152deg, rgba(53, 240, 200, 0.13), rgba(127, 227, 255, 0.04) 52%, transparent 72%);
  transform: skewX(-16deg);
  pointer-events: none;
}

.page-about .ab-top__inner {
  position: relative;
  z-index: 1;
  max-width: 1180px;
  margin-inline: auto;
}

.page-about .ab-kicker {
  margin: 20px 0 0;
  font-family: var(--dt-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dt-cyan);
}

.page-about .ab-top h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--dt-font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--dt-paper);
}

.page-about .ab-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.7vw, 1.1rem);
  line-height: 1.76;
  color: var(--ab-soft);
}

.page-about .ab-figures {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--dt-line);
}

.page-about .ab-figures li {
  padding: 14px 10px 12px 0;
  border-bottom: 1px solid var(--dt-line-soft);
}

.page-about .ab-figures li:nth-child(even) {
  padding-left: 14px;
  border-left: 1px solid var(--dt-line-soft);
}

.page-about .ab-figures__n {
  display: block;
  font-family: var(--dt-font-mono);
  font-weight: 600;
  font-size: clamp(1.32rem, 3.4vw, 1.85rem);
  line-height: 1;
  color: var(--dt-cyan);
}

.page-about .ab-figures__l {
  display: block;
  margin-top: 7px;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--dt-muted);
}

/* ---------- 画布与章节轨 ---------- */
.page-about .ab-canvas {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--ab-pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-rail {
  border-bottom: 1px solid var(--dt-line-soft);
}

.page-about .ab-rail__sticky {
  padding: 16px 0 14px;
}

.page-about .ab-rail__title {
  margin: 0 0 10px;
  font-family: var(--dt-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dt-muted);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 0.8rem;
  color: var(--dt-muted);
  text-decoration: none;
  background: var(--dt-panel);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: color 0.2s var(--dt-ease), background 0.2s var(--dt-ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--dt-paper);
  background: var(--dt-raise);
}

.page-about .ab-rail__link:focus-visible {
  outline: 2px solid var(--dt-cyan);
  outline-offset: 2px;
}

.page-about .ab-rail__no {
  font-family: var(--dt-font-mono);
  font-size: 0.68rem;
  color: var(--dt-cyan);
}

.page-about .ab-rail__scale {
  display: none;
}

/* ---------- 正文流 ---------- */
.page-about .ab-flow {
  font-size: clamp(0.96rem, 1.5vw, 1.02rem);
  padding-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-chapter {
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--dt-line-soft);
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: clamp(26px, 4vw, 48px);
}

.page-about .ab-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .ab-chapter__no {
  font-family: var(--dt-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--dt-cyan);
}

.page-about .ab-chapter h2 {
  margin: 8px 0 0;
  flex: 1 1 260px;
  max-width: 24ch;
  font-family: var(--dt-font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.2vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--dt-paper);
}

.page-about .ab-flow p {
  margin: 16px 0 0;
  max-width: 64ch;
  line-height: 1.78;
  color: var(--ab-soft);
}

.page-about .ab-flow strong {
  color: var(--dt-paper);
  font-weight: 600;
}

/* ---------- 时间刻度 ---------- */
.page-about .ab-ticks {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--dt-line);
}

.page-about .ab-ticks__item {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--dt-line-soft);
}

.page-about .ab-ticks__t {
  font-family: var(--dt-font-mono);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  color: var(--dt-amber);
}

.page-about .ab-ticks__t::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 9px;
  vertical-align: 1px;
  background: var(--dt-amber);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .ab-ticks__d {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--dt-muted);
}

/* ---------- 编辑小组 ---------- */
.page-about .ab-desk {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-about .ab-desk__item {
  padding: 18px 18px 20px;
  background: var(--dt-panel);
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
}

.page-about .ab-desk__item h3 {
  margin: 0;
  font-family: var(--dt-font-display);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--dt-cyan);
}

.page-about .ab-desk__item p {
  margin: 9px 0 0;
  max-width: none;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--dt-muted);
}

/* ---------- 三审步骤 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  counter-reset: abstep;
}

.page-about .ab-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--dt-line-soft);
}

.page-about .ab-steps__no {
  font-family: var(--dt-font-mono);
  font-size: 0.78rem;
  line-height: 1.9;
  color: var(--dt-cyan);
  letter-spacing: 0.08em;
}

.page-about .ab-flow .ab-steps__txt {
  margin: 0;
  max-width: 60ch;
  font-size: 0.92rem;
  line-height: 1.72;
}

/* ---------- 编辑台旁注 ---------- */
.page-about .ab-note {
  margin: 26px 0 0;
  padding: 20px 22px;
  background: linear-gradient(135deg, rgba(255, 178, 74, 0.14), rgba(255, 178, 74, 0.03) 70%);
  border-left: 2px solid var(--dt-amber);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}

.page-about .ab-note__t {
  margin: 0;
  max-width: none;
  font-family: var(--dt-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dt-amber);
}

.page-about .ab-flow .ab-note p + p {
  margin-top: 10px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ab-soft);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 28px 0 0;
}

.page-about .ab-figure--tight {
  margin-top: 26px;
}

/* ---------- 发展历程 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .ab-tl__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl__year {
  position: relative;
  padding-right: 12px;
  text-align: right;
  border-right: 1px solid var(--dt-line);
  font-family: var(--dt-font-mono);
  font-weight: 600;
  font-size: clamp(1.05rem, 3vw, 1.5rem);
  line-height: 1.15;
  color: var(--dt-cyan);
}

.page-about .ab-tl__year::after {
  content: "";
  position: absolute;
  top: 0.48em;
  right: -4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dt-cyan);
  box-shadow: 0 0 0 3px rgba(53, 240, 200, 0.16);
}

.page-about .ab-tl__body h3 {
  margin: 0;
  font-family: var(--dt-font-display);
  font-weight: 600;
  font-size: clamp(1rem, 2.3vw, 1.2rem);
  letter-spacing: 0.01em;
  color: var(--dt-paper);
}

.page-about .ab-flow .ab-tl__body p {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--dt-muted);
}

/* ---------- 覆盖 ---------- */
.page-about .ab-cov {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--dt-line-soft);
}

.page-about .ab-cov li {
  background: var(--dt-bg);
  padding: 18px 14px 16px;
}

.page-about .ab-cov__n {
  display: block;
  font-family: var(--dt-font-mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 5vw, 2.35rem);
  line-height: 1;
  color: var(--dt-cool);
}

.page-about .ab-cov__l {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--dt-muted);
}

/* ---------- 服务标准 ---------- */
.page-about .ab-std-wrap {
  display: grid;
  gap: 8px;
  margin-top: 26px;
}

.page-about .ab-std {
  margin: 0;
  padding: 0;
}

.page-about .ab-std__row {
  display: grid;
  gap: 6px;
  padding: 15px 0;
  border-top: 1px solid var(--dt-line-soft);
}

.page-about .ab-std__row:last-child {
  border-bottom: 1px solid var(--dt-line-soft);
}

.page-about .ab-std dt {
  font-family: var(--dt-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--dt-cyan);
}

.page-about .ab-std dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ab-soft);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  max-width: 1180px;
  margin-inline: auto;
  padding: 0 var(--ab-pad) clamp(48px, 7vw, 88px);
}

.page-about .ab-cta__inner {
  position: relative;
  padding: clamp(26px, 4vw, 46px);
  background:
    linear-gradient(142deg, rgba(53, 240, 200, 0.16), rgba(13, 36, 28, 0.9) 46%, rgba(13, 36, 28, 0.96) 100%),
    var(--dt-panel);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .ab-cta__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 2px;
  background: linear-gradient(to right, var(--dt-cyan), var(--dt-amber));
}

.page-about .ab-cta__kicker {
  margin: 0;
  font-family: var(--dt-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dt-cyan);
}

.page-about .ab-cta h2 {
  margin: 12px 0 0;
  max-width: 22ch;
  font-family: var(--dt-font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  line-height: 1.16;
  color: var(--dt-paper);
}

.page-about .ab-cta p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.76;
  color: var(--ab-soft);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .ab-cta__links {
  margin-top: 18px;
  font-family: var(--dt-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--dt-muted);
}

.page-about .ab-cta__links a {
  color: var(--dt-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--dt-line);
  padding-bottom: 1px;
}

.page-about .ab-cta__links a:hover,
.page-about .ab-cta__links a:focus-visible {
  border-bottom-color: var(--dt-cyan);
}

.page-about .ab-cta__links span {
  margin: 0 8px;
  color: var(--dt-muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .ab-ticks__item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

  .page-about .ab-std__row {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .ab-top {
    background-size: 80px 80px;
  }

  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-figures li:nth-child(even) {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .ab-figures li + li {
    padding-left: 16px;
    border-left: 1px solid var(--dt-line-soft);
  }

  .page-about .ab-cov {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-tl__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-canvas {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(30px, 4.4vw, 68px);
  }

  .page-about .ab-rail {
    border-bottom: 0;
    border-right: 1px solid var(--dt-line-soft);
  }

  .page-about .ab-rail__sticky {
    position: sticky;
    top: 96px;
    padding: 54px 20px 28px 0;
  }

  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .ab-rail__list li + li {
    margin-top: 2px;
  }

  .page-about .ab-rail__link {
    display: flex;
    width: 100%;
    white-space: normal;
    padding: 9px 0 9px 12px;
    background: none;
    clip-path: none;
    border-left: 2px solid transparent;
    font-size: 0.82rem;
    line-height: 1.45;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    background: rgba(20, 54, 42, 0.6);
    border-left-color: var(--dt-cyan);
  }

  .page-about .ab-rail__scale {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 26px;
    padding-top: 20px;
    border-top: 1px solid var(--dt-line-soft);
  }

  .page-about .ab-rail__scale span {
    position: relative;
    padding-left: 16px;
    font-family: var(--dt-font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    color: var(--dt-muted);
  }

  .page-about .ab-rail__scale span::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 9px;
    height: 1px;
    background: var(--dt-cool);
  }

  .page-about .ab-chapter h2 {
    flex: 0 1 auto;
  }

  .page-about .ab-std-wrap {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    column-gap: clamp(26px, 3.4vw, 46px);
    align-items: start;
  }

  .page-about .ab-figure--tight {
    margin-top: 0;
  }
}
<<<END>>>