.page-about {
  --ab-line-soft: rgba(46, 76, 64, 0.55);
  --ab-paper-line: rgba(19, 21, 25, 0.16);
  --ab-body: rgba(244, 242, 233, 0.84);
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gut);
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--dim);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(20px, 5vw, 40px) clamp(36px, 7vw, 76px);
  background-image:
    linear-gradient(to right, var(--ab-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-line-soft) 1px, transparent 1px);
  background-size: 88px 88px;
  background-position: center top;
  opacity: 1;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background-color: var(--line);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(18px, 4vw, 34px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.page-about .breadcrumbs a {
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 22px;
}

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

.page-about .ab-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(30px, 8.4vw, 62px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-body);
}

.page-about .ab-hero__figure {
  margin-top: 6px;
}

/* 章节通用 */
.page-about .ab-sec {
  padding-block: clamp(40px, 7vw, 86px);
  border-top: 1px solid var(--line);
}

.page-about .ab-sec__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .ab-sec h2 {
  margin: 0;
  max-width: 20em;
  font-size: clamp(22px, 4.6vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-sec__intro {
  margin: 4px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-prose p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-body);
}

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

/* 起点 */
.page-about .ab-origin__grid {
  display: grid;
  gap: 22px;
}

.page-about .ab-ticket-note {
  padding: 16px 18px;
  background-color: var(--ink-2);
  border-left: 4px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .ab-ticket-note__no {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.page-about .ab-ticket-note__txt {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-body);
}

/* 三条业务线 */
.page-about .ab-lines {
  display: grid;
  gap: 12px;
}

.page-about .ab-line {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 16px 18px;
  background-color: var(--ink-2);
  border-left: 3px solid var(--line);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-line:hover,
.page-about .ab-line:focus-within {
  border-left-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .ab-line__no {
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-about .ab-line h3 {
  margin: 0 0 6px;
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .ab-line p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ab-body);
}

/* 覆盖范围 */
.page-about .ab-sec--paper {
  background-color: var(--paper);
  color: var(--char);
  border-top-color: var(--char);
  border-bottom: 3px solid var(--brick);
}

.page-about .ab-sec--paper .eyebrow {
  color: var(--brick);
}

.page-about .ab-sec--paper .ab-prose p {
  color: var(--char);
  opacity: 0.86;
}

.page-about .ab-scope {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .ab-dial-box {
  position: relative;
  width: min(100%, 258px);
  margin-inline: auto;
}

.page-about .ab-dial {
  display: block;
  width: 100%;
  height: auto;
  color: var(--muted);
}

.page-about .ab-dial circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 1;
  opacity: 0.6;
}

.page-about .ab-dial circle:nth-child(2) {
  stroke-dasharray: 2 7;
  opacity: 0.85;
}

.page-about .ab-dial circle:nth-child(3) {
  stroke-dasharray: 1 5;
  opacity: 0.45;
}

.page-about .ab-dial-box__core {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 4px;
  margin: 0;
  text-align: center;
}

.page-about .ab-dial-box__v {
  font-family: var(--font-mono);
  font-size: clamp(34px, 8vw, 46px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--char);
}

.page-about .ab-dial-box__l {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .ab-cats {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-paper-line);
}

.page-about .ab-cat {
  display: grid;
  grid-template-columns: 5.4em minmax(40px, 1fr) 2.6em;
  align-items: center;
  gap: 12px;
  padding: 12px 8px;
  border-bottom: 1px solid var(--ab-paper-line);
  transition: background-color 0.16s var(--ease);
}

.page-about .ab-cat:hover {
  background-color: var(--accent-soft);
}

.page-about .ab-cat__name {
  font-size: 15px;
  font-weight: 700;
}

.page-about .ab-cat__bar {
  display: block;
  position: relative;
  height: 6px;
  background-color: rgba(19, 21, 25, 0.14);
}

.page-about .ab-cat__bar::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background-color: var(--brick);
  transition: width 0.24s var(--ease);
}

.page-about .ab-cat:nth-child(1) .ab-cat__bar::before { width: 100%; }
.page-about .ab-cat:nth-child(2) .ab-cat__bar::before { width: 75%; }
.page-about .ab-cat:nth-child(3) .ab-cat__bar::before { width: 50%; }
.page-about .ab-cat:nth-child(4) .ab-cat__bar::before { width: 37.5%; }
.page-about .ab-cat:nth-child(5) .ab-cat__bar::before { width: 37.5%; }
.page-about .ab-cat:nth-child(6) .ab-cat__bar::before { width: 50%; }

.page-about .ab-cat__n {
  font-family: var(--font-mono);
  font-size: 15px;
  text-align: right;
  color: var(--char);
}

.page-about .ab-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.page-about .ab-num {
  border-top: 2px solid var(--char);
  padding-top: 8px;
}

.page-about .ab-num__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 28px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.page-about .ab-num__l {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ab-wide {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .ab-sec--paper .ab-figure__cap {
  color: var(--muted);
}

/* 团队与术语 */
.page-about .ab-team {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .ab-terms {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .ab-term {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 10px 6px;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
  transition: background-color 0.16s var(--ease);
}

.page-about .ab-term:hover {
  background-color: var(--ink-2);
}

.page-about .ab-term__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dim);
}

.page-about .ab-term__zh {
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-term__en {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--dim);
}

/* 时间轴 */
.page-about .ab-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-phase {
  display: grid;
  grid-template-columns: 46px 16px minmax(0, 1fr);
  gap: 10px;
  padding-block: 20px;
  border-top: 1px solid var(--line);
}

.page-about .ab-phase:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-phase__year {
  font-family: var(--font-mono);
  font-size: clamp(16px, 3.4vw, 20px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.page-about .ab-phase__rail {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .ab-phase__rail::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: -24px;
  left: 50%;
  width: 1px;
  background-color: var(--line);
}

.page-about .ab-phase:last-child .ab-phase__rail::before {
  bottom: auto;
  height: 14px;
}

.page-about .ab-phase__dot {
  position: relative;
  z-index: 1;
  width: 10px;
  height: 10px;
  margin-top: 6px;
  background-color: var(--accent);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .ab-phase__body {
  outline: none;
}

.page-about .ab-phase__body:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 6px;
}

.page-about .ab-phase__body h3 {
  margin: 0 0 6px;
  font-size: clamp(16px, 2.6vw, 20px);
  font-weight: 700;
}

.page-about .ab-phase__body p {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ab-body);
}

.page-about .ab-phase__more {
  display: none;
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--accent);
  font-size: 14px;
  line-height: 1.7;
  color: var(--accent-soft);
}

.page-about .ab-phase__body:hover .ab-phase__more,
.page-about .ab-phase__body:focus .ab-phase__more,
.page-about .ab-phase__body:focus-within .ab-phase__more {
  display: block;
}

/* 审核流程 */
.page-about .ab-flow {
  display: grid;
  gap: 10px;
}

.page-about .ab-step {
  padding: 16px;
  background-color: var(--ink-2);
  border-top: 2px solid var(--line);
  transition: border-top-color 0.2s var(--ease);
}

.page-about .ab-step:hover {
  border-top-color: var(--accent-soft);
}

.page-about .ab-step--flag {
  border-top-color: var(--accent);
}

.page-about .ab-step__no {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--brick);
}

.page-about .ab-step--flag .ab-step__no {
  color: var(--accent);
}

.page-about .ab-step h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ab-body);
}

/* 收尾 */
.page-about .ab-cta {
  padding-block: clamp(40px, 7vw, 80px);
  background-color: var(--char);
  border-top: 3px solid var(--brick);
}

.page-about .ab-cta__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-cta h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 4.6vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .ab-cta__lead {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-body);
}

.page-about .ab-cta__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.page-about .ab-cta__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
  align-content: start;
}

.page-about .ab-cta__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 14px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--char-2);
}

.page-about .ab-cta__k {
  font-size: 14px;
  line-height: 1.6;
  color: var(--dim);
}

.page-about .ab-link {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--accent-soft);
  border-bottom-color: var(--accent-soft);
}

@media (min-width: 560px) {
  .page-about .ab-term {
    grid-template-columns: 34px minmax(0, 1fr) minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .ab-term__en {
    grid-column: auto;
    text-align: right;
  }
}

@media (min-width: 760px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: start;
    gap: clamp(24px, 4vw, 56px);
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 26px minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-hero__tag {
    display: block;
    margin: 6px 0 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.28em;
    color: var(--dim);
    white-space: nowrap;
  }

  .page-about .ab-lead {
    font-size: 17px;
  }

  .page-about .ab-line {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 22px 26px;
    gap: 18px;
  }

  .page-about .ab-line:nth-child(1) { margin-right: 12%; }
  .page-about .ab-line:nth-child(2) { margin-inline: 6%; }
  .page-about .ab-line:nth-child(3) { margin-left: 12%; }

  .page-about .ab-scope {
    grid-template-columns: 258px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-dial-box {
    margin-inline: 0;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-phase {
    grid-template-columns: 88px 20px minmax(0, 1fr);
    gap: 16px;
    padding-block: 24px;
  }

  .page-about .ab-phase__year {
    text-align: right;
  }

  .page-about .ab-cta__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-line,
  .page-about .ab-cat,
  .page-about .ab-term,
  .page-about .ab-step,
  .page-about .ab-link,
  .page-about .breadcrumbs a {
    transition: none;
  }

  .page-about .ab-line:hover,
  .page-about .ab-line:focus-within {
    transform: none;
  }
}
<<<END>>>