.page-about {
  --about-rail: 148px;
  --about-gap: clamp(24px, 4vw, 56px);
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: var(--sp-8);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: var(--sp-5) 0 var(--sp-7);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 68% at 84% 8%, rgba(242, 183, 5, 0.16), transparent 66%),
    radial-gradient(52% 62% at 4% 96%, rgba(61, 220, 151, 0.11), transparent 70%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-6);
}

.page-about .about-hero__copy h1 {
  margin: var(--sp-3) 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: var(--sp-4) 0 0;
  font-size: var(--fs-lead);
  line-height: 1.75;
  color: var(--paper);
  max-width: 40em;
}

.page-about .about-hero__text {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--steel);
  max-width: 40em;
}

.page-about .about-stats {
  list-style: none;
  margin: var(--sp-6) 0 0;
  padding: var(--sp-4) 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-3);
  border-top: 1px solid var(--line);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 32px);
  color: var(--platform);
  line-height: 1.1;
}

.page-about .about-stats__label {
  display: block;
  margin-top: var(--sp-1);
  font-size: var(--fs-tiny);
  line-height: 1.5;
  color: var(--steel);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .about-hero__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 编辑栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-6);
  padding-top: var(--sp-7);
}

.page-about .about-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--sp-2) var(--sp-5);
  padding-bottom: var(--sp-5);
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__title {
  margin: 0;
  font-size: var(--fs-tiny);
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-rail__years,
.page-about .about-rail__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
}

.page-about .about-rail__years a {
  position: relative;
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-lead);
  color: var(--steel);
  text-decoration: none;
  padding: var(--sp-1) 0;
  transition: color var(--dur-1) var(--ease);
}

.page-about .about-rail__years a:hover,
.page-about .about-rail__years a:focus-visible {
  color: var(--platform);
}

.page-about .about-rail__tags a {
  display: block;
  padding: 4px 10px;
  font-size: var(--fs-small);
  color: var(--paper-dim);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease),
    background-color var(--dur-1) var(--ease);
}

.page-about .about-rail__tags a:hover,
.page-about .about-rail__tags a:focus-visible {
  color: var(--ink);
  background: var(--lamp);
  border-color: var(--lamp);
}

.page-about .about-side {
  padding-bottom: var(--sp-5);
  border-bottom: 1px solid var(--line);
}

.page-about .about-side__note {
  margin: 0 0 var(--sp-3);
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--steel);
  padding-left: var(--sp-3);
  border-left: 2px solid var(--line);
}

.page-about .about-side__link {
  display: inline-block;
  margin-top: var(--sp-1);
  font-size: var(--fs-small);
  color: var(--platform);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 183, 5, 0.4);
  padding-bottom: 2px;
}

.page-about .about-side__link:hover,
.page-about .about-side__link:focus-visible {
  color: var(--lamp);
  border-bottom-color: var(--lamp);
}

/* ---------- 叙事段 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  margin-bottom: var(--sp-8);
}

.page-about .about-sec:last-child {
  margin-bottom: 0;
}

.page-about .about-sec h2 {
  margin: var(--sp-2) 0 var(--sp-4);
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-sec h3 {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-lead);
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-sec p {
  margin: 0 0 var(--sp-4);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-dim);
  max-width: 44em;
}

.page-about .about-quote {
  margin: var(--sp-6) 0 0;
  padding: var(--sp-2) 0 var(--sp-2) var(--sp-5);
  border-left: 3px solid var(--platform);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.6vw, 26px);
  line-height: 1.5;
  font-weight: 700;
  color: var(--lamp);
}

.page-about .about-quote cite {
  display: block;
  margin-top: var(--sp-2);
  font-size: var(--fs-tiny);
  font-style: normal;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: var(--sp-7);
  padding: var(--sp-7) 0 var(--sp-6);
  background: linear-gradient(180deg, var(--ink-deep) 0%, #101F30 62%, var(--ink) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--platform), var(--lamp) 42%, var(--signal) 100%);
  opacity: 0.85;
}

.page-about .about-timeline__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-timeline h2 {
  margin: var(--sp-2) 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-timeline__lede {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-timeline__scene {
  position: relative;
  margin: var(--sp-5) 0 0;
  aspect-ratio: 16 / 7;
  overflow: hidden;
}

.page-about .about-timeline__scene::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 27, 42, 0.5) 0%, rgba(9, 19, 32, 0.82) 100%);
}

.page-about .about-timeline__scene img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-track {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: var(--sp-2) max(var(--gutter), calc((100vw - var(--wrap)) / 2)) var(--sp-4);
  display: flex;
  gap: var(--sp-4);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .about-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-track::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 3px;
}

.page-about .about-card {
  position: relative;
  flex: 0 0 min(80vw, 342px);
  scroll-snap-align: start;
  background: var(--ink-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: var(--sp-5) var(--sp-4) var(--sp-5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  transition: border-color var(--dur-2) var(--ease), transform var(--dur-2) var(--ease);
}

.page-about .about-card:hover {
  border-color: rgba(242, 183, 5, 0.5);
  transform: translateY(-3px);
}

.page-about .about-card__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 7vw, 44px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--platform);
}

.page-about .about-card h3 {
  margin: var(--sp-3) 0 var(--sp-2);
  font-size: var(--fs-lead);
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-card p {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-card__fix {
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px dashed var(--line);
  color: var(--signal);
  font-size: var(--fs-tiny);
  line-height: 1.7;
}

.page-about .about-timeline__status {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--sp-2) var(--sp-3);
  margin: var(--sp-4) 0 0;
  padding: var(--sp-4);
  background: rgba(22, 40, 60, 0.72);
  border-radius: var(--radius-s);
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 流程线 ---------- */
.page-about .flowline {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
}

.page-about .flowline__item {
  position: relative;
  padding: var(--sp-4) 0 0;
  border-top: 2px solid var(--line);
  transition: border-color var(--dur-2) var(--ease);
}

.page-about .flowline__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--steel);
  box-shadow: 0 0 0 4px rgba(143, 163, 184, 0.12);
  transition: background-color var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
}

.page-about .flowline__item:hover,
.page-about .flowline__item:focus-within {
  border-top-color: var(--platform);
}

.page-about .flowline__item:hover::before,
.page-about .flowline__item:focus-within::before {
  background: var(--platform);
  box-shadow: 0 0 0 5px rgba(242, 183, 5, 0.2);
}

.page-about .flowline__step {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .flowline__title {
  margin: var(--sp-1) 0 var(--sp-2);
  font-size: var(--fs-body);
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flowline__note {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--steel);
  transition: color var(--dur-2) var(--ease);
}

.page-about .flowline__item:hover .flowline__note,
.page-about .flowline__item:focus-within .flowline__note {
  color: var(--paper-dim);
}

/* ---------- 校对 ---------- */
.page-about .about-proof {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-6);
  align-items: start;
}

.page-about .about-proof__copy p {
  max-width: 40em;
}

.page-about .about-proof__contact {
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--brick);
  background: rgba(209, 73, 91, 0.08);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-proof__figure {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-proof__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 四条主线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
}

.page-about .about-lines__card {
  display: block;
  height: 100%;
  padding: var(--sp-5) var(--sp-4);
  background: var(--ink-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  text-decoration: none;
  transition: border-color var(--dur-2) var(--ease), background-color var(--dur-2) var(--ease),
    transform var(--dur-2) var(--ease);
}

.page-about .about-lines__card:hover,
.page-about .about-lines__card:focus-visible {
  border-color: var(--platform);
  background: #1A2E44;
  transform: translateY(-3px);
}

.page-about .about-lines__card h3 {
  margin: var(--sp-3) 0 var(--sp-2);
  font-size: var(--fs-body);
  line-height: 1.5;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-lines__card p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: var(--sp-8);
  padding: var(--sp-7) 0;
  background: linear-gradient(115deg, #0A1624 0%, #16283C 58%, #12293B 100%);
  border-top: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), 0 100%);
}

.page-about .about-cta__inner {
  position: relative;
}

.page-about .about-cta h2 {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0 0 var(--sp-5);
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 620px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-stats {
    gap: var(--sp-5);
  }
}

@media (min-width: 760px) {
  .page-about .flowline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--sp-3);
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .flowline__note {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
    overflow: hidden;
  }

  .page-about .flowline__item:hover .flowline__note,
  .page-about .flowline__item:focus-within .flowline__note {
    -webkit-line-clamp: 8;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-top: var(--sp-6);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: clamp(28px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: var(--sp-5);
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding: 0 0 0 var(--sp-4);
    border-bottom: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .about-rail__title {
    margin: 0 0 var(--sp-3);
  }

  .page-about .about-rail__years,
  .page-about .about-rail__tags {
    display: block;
    margin-bottom: var(--sp-5);
  }

  .page-about .about-rail__years li + li {
    margin-top: var(--sp-2);
  }

  .page-about .about-rail__years a {
    font-size: var(--fs-h3);
  }

  .page-about .about-rail__years a::before {
    content: "";
    position: absolute;
    left: -25px;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -4.5px;
    border-radius: 50%;
    background: var(--line);
    transition: background-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
  }

  .page-about .about-rail__years a:hover::before,
  .page-about .about-rail__years a:focus-visible::before {
    background: var(--platform);
    transform: scale(1.35);
  }

  .page-about .about-rail__tags li + li {
    margin-top: var(--sp-2);
  }

  .page-about .about-rail__tags a {
    display: inline-block;
  }

  .page-about .about-side {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: 0;
  }

  .page-about .about-proof {
    grid-template-columns: minmax(0, 1fr) minmax(0, 280px);
    gap: var(--sp-7);
  }

  .page-about .about-proof__figure {
    margin-top: var(--sp-6);
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  }

  .page-about .about-card {
    flex: 0 0 360px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-lines__card,
  .page-about .flowline__item,
  .page-about .flowline__item::before {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-lines__card:hover {
    transform: none;
  }
}
<<<END>>>