.page-about {
  background-color: var(--night);
  color: var(--paper);
  overflow-x: clip;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 20px;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--small);
  letter-spacing: 0.06em;
}
.page-about .breadcrumb__item a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
.page-about .breadcrumb__item a:hover {
  color: var(--orange);
}
.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--amber);
}
.page-about .breadcrumb__sep {
  color: rgba(138, 154, 172, 0.55);
}

/* ---------- 通用标题 ---------- */
.page-about .ab-h2 {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--h2);
  line-height: 1.16;
  letter-spacing: -0.035em;
  color: var(--paper);
}
.page-about .ab-sub {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.68);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 8px 0 64px;
  background:
    radial-gradient(980px 480px at 84% -12%, rgba(18, 58, 92, 0.95), transparent 68%),
    var(--night);
}
.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-top: 24px;
  align-items: start;
}
.page-about .ab-hero__title {
  margin: 18px 0 22px;
  max-width: 11em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--h1);
  line-height: 1.06;
  letter-spacing: -0.045em;
  color: var(--paper);
}
.page-about .ab-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.78);
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .ab-hero__aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 20px 22px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line-mid);
  border-radius: 2px;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.45);
  transition: transform var(--t-base) var(--ease);
}
.page-about .ab-fact:hover {
  transform: translate(-2px, -2px);
}
.page-about .ab-fact--alt {
  background: var(--indigo);
  color: var(--paper);
  border-color: var(--line-strong);
}
.page-about .ab-fact__label {
  color: var(--wine);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
}
.page-about .ab-fact--alt .ab-fact__label {
  color: var(--amber);
}
.page-about .ab-fact__value {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}
.page-about .ab-fact--alt .ab-fact__value {
  color: var(--lime);
}
.page-about .ab-fact__note {
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(16, 20, 24, 0.68);
}
.page-about .ab-fact--alt .ab-fact__note {
  color: rgba(244, 241, 232, 0.74);
}
.page-about .ab-hero__media {
  margin: 44px 0 0;
}

/* ---------- 起源 ---------- */
.page-about .ab-origin {
  padding: 64px 0 72px;
  background: var(--paper);
  color: var(--ink);
}
.page-about .ab-origin .tape {
  color: var(--wine);
}
.page-about .ab-origin .ab-h2 {
  color: var(--ink);
}
.page-about .ab-prose {
  max-width: 68ch;
}
.page-about .ab-prose p {
  margin: 0 0 18px;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(16, 20, 24, 0.82);
}
.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}
.page-about .ab-pull {
  margin: 30px 0 0;
  padding: 6px 0 6px 20px;
  border-left: 4px solid var(--orange);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  line-height: 1.7;
  letter-spacing: -0.015em;
  color: var(--wine);
}
.page-about .ab-origin__side {
  margin-top: 36px;
}
.page-about .ab-note {
  margin-top: 22px;
  padding: 24px 22px 26px;
  background: var(--night);
  color: var(--paper);
  border: 1px solid var(--night);
  border-radius: 2px;
  box-shadow: 6px 6px 0 rgba(110, 31, 46, 0.6);
}
.page-about .ab-note .tape {
  color: var(--amber);
}
.page-about .ab-note__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-about .ab-note__list li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(244, 241, 232, 0.84);
}
.page-about .ab-note__list .idx {
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  padding: 68px 0 72px;
  background: var(--night);
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-steps {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-step__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--lime);
  transition: color var(--t-fast) var(--ease);
}
.page-about .ab-step__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .ab-step__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 241, 232, 0.7);
}
.page-about .ab-step:hover .ab-step__year {
  color: var(--orange);
}

/* ---------- 服务对象 ---------- */
.page-about .ab-serve {
  position: relative;
  padding: 68px 0 76px;
  background: var(--archive);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-serve::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(244, 241, 232, 0.06) 0,
    rgba(244, 241, 232, 0.06) 1px,
    transparent 1px,
    transparent 32px
  );
  pointer-events: none;
}
.page-about .ab-serve .wrap {
  position: relative;
}
.page-about .ab-serve .tape {
  color: var(--lime);
}
.page-about .ab-serve__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 30px;
}
.page-about .ab-serve__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 30px;
  background: rgba(11, 30, 58, 0.62);
  border: 1px solid rgba(244, 241, 232, 0.2);
  border-radius: 2px;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.35);
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
.page-about .ab-serve__card::before {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  background: var(--orange);
}
.page-about .ab-serve__card--b::before {
  background: var(--lime);
}
.page-about .ab-serve__card--c::before {
  background: var(--amber);
}
.page-about .ab-serve__card:hover {
  transform: translate(-3px, -3px);
  border-color: var(--orange);
}
.page-about .ab-serve__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .ab-serve__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 241, 232, 0.76);
}

/* ---------- 做事方式 ---------- */
.page-about .ab-craft {
  padding: 68px 0 72px;
  background: var(--night);
}
.page-about .ab-craft__side {
  margin-bottom: 36px;
}
.page-about .ab-craft__side .media {
  margin: 24px 0 0;
}
.page-about .ab-rule-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-rule-list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-rule-list .idx {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 3px;
}
.page-about .ab-rule-list h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .ab-rule-list p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 241, 232, 0.7);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  padding: 0 0 80px;
  background: var(--night);
}
.page-about .ab-cta__box {
  position: relative;
  padding: 34px 24px 38px;
  background: linear-gradient(135deg, var(--indigo) 0%, var(--night) 72%);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  box-shadow: 7px 7px 0 rgba(0, 0, 0, 0.42);
}
.page-about .ab-cta__box .idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}
.page-about .ab-cta__box h2 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.035em;
  color: var(--paper);
}
.page-about .ab-cta__box p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.78);
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__aside {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .ab-serve__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-cta__box {
    padding: 46px 40px 50px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 12px 0 84px;
  }
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gap);
    padding-top: 40px;
  }
  .page-about .ab-hero__aside {
    grid-template-columns: 1fr;
    padding-top: 56px;
  }
  .page-about .ab-hero__media {
    margin-top: 56px;
  }
  .page-about .ab-origin {
    padding: 84px 0 92px;
  }
  .page-about .ab-origin__side {
    margin-top: 0;
  }
  .page-about .ab-step {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
    padding: 26px 0;
  }
  .page-about .ab-serve__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gap);
  }
  .page-about .ab-craft__side {
    margin-bottom: 0;
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1120px) {
  .page-about .ab-hero__aside {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-fact,
  .page-about .ab-serve__card,
  .page-about .ab-step__year {
    transition: none;
  }
  .page-about .ab-fact:hover,
  .page-about .ab-serve__card:hover {
    transform: none;
  }
}
<<<END>>>