.page-about {
  --pa-paper-ink: #12161D;
  --pa-index-w: 208px;
  display: block;
  background: var(--void);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(38px, 6.5vw, 92px) 0 clamp(42px, 6vw, 86px);
  background:
    radial-gradient(78% 62% at 86% 4%, rgba(244, 85, 43, .24), transparent 64%),
    radial-gradient(62% 58% at 4% 98%, rgba(46, 123, 224, .20), transparent 68%),
    linear-gradient(158deg, #0B0E14 0%, #131A26 56%, #0B0E14 100%);
}

.page-about .about-hero-slash {
  position: absolute;
  z-index: 0;
  top: -20%;
  right: -16%;
  width: 56%;
  height: 142%;
  background: linear-gradient(140deg, rgba(244, 85, 43, .28), rgba(169, 201, 242, .10) 52%, transparent 78%);
  transform: skewX(-16deg);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 24px);
}

.page-about .about-hero-title {
  margin: 0;
  max-width: 19ch;
  font-size: clamp(34px, 6.4vw, 80px);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -.022em;
  color: var(--lamp);
}

.page-about .about-hero-lede {
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.88;
  color: var(--ink-dim);
}

.page-about .about-hero-marks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: clamp(16px, 2.4vw, 30px);
  margin-top: clamp(8px, 1.6vw, 18px);
  padding-top: clamp(18px, 2.6vw, 30px);
  border-top: 1px solid var(--line);
  max-width: 680px;
}

.page-about .about-mark {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-mark-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--ember);
}

.page-about .about-mark-cap {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--ink-faint);
}

/* ---------- 编年主体 ---------- */

.page-about .about-chronicle {
  position: relative;
  padding: clamp(30px, 5vw, 68px) 0 clamp(58px, 9vw, 128px);
  background:
    radial-gradient(64% 26% at 94% 2%, rgba(244, 85, 43, .12), transparent 62%),
    linear-gradient(180deg, #0B0E14 0%, #111722 48%, #0B0E14 100%);
}

.page-about .about-chronicle-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 60px);
  align-items: start;
}

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

.page-about .about-index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--ink-faint);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 13px;
  border-left: 2px solid var(--line);
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: color .26s var(--ease), border-color .26s var(--ease), padding-left .26s var(--ease);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--lamp);
  border-left-color: var(--flame);
  padding-left: 17px;
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-faint);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(52px, 8vw, 124px);
  min-width: 0;
}

/* ---------- 单个阶段 ---------- */

.page-about .about-stage {
  position: relative;
  min-width: 0;
  scroll-margin-top: calc(var(--header-h, 72px) + 26px);
}

.page-about .about-stage-title {
  margin: 10px 0 0;
  font-size: clamp(25px, 3.5vw, 44px);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--lamp);
}

.page-about .about-stage-lede {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.88;
  color: var(--ink-dim);
}

.page-about .about-stage-text {
  min-width: 0;
}

.page-about .about-stage-text > p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.9;
  color: var(--ink-dim);
}

.page-about .about-stage-text > p:last-child {
  margin-bottom: 0;
}

.page-about .about-stage-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(20px, 3vw, 36px);
  align-items: center;
}

.page-about .about-stage-media {
  position: relative;
  margin: 0;
}

.page-about .about-stage-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 3px;
  box-shadow: 0 34px 74px -40px rgba(0, 0, 0, .95);
}

.page-about .about-stage-media--cut img {
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
}

.page-about .about-stage-cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-faint);
}

/* ---------- 纸张叠层 ---------- */

.page-about .about-stage--paper {
  --ink: #12161D;
  --ink-dim: rgba(18, 22, 29, .72);
  --ink-faint: rgba(18, 22, 29, .46);
  --line: rgba(18, 22, 29, .14);
  --line-strong: rgba(18, 22, 29, .30);
  --lamp: #12161D;
  padding: clamp(26px, 3.6vw, 54px);
  border-radius: 4px;
  background: linear-gradient(178deg, #F7F5F2 0%, #EDE6DC 100%);
  color: var(--ink);
  box-shadow:
    14px 14px 0 -3px rgba(11, 14, 20, .6),
    0 34px 74px -42px rgba(0, 0, 0, .92);
}

.page-about .about-stage--paper .about-stage-title {
  color: var(--pa-paper-ink);
}

/* ---------- 日常四条线 ---------- */

.page-about .about-daily {
  list-style: none;
  margin: clamp(18px, 2.6vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 1.8vw, 22px);
}

.page-about .about-daily-item {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: linear-gradient(158deg, rgba(27, 34, 48, .82), rgba(11, 14, 20, .58));
  transition: border-color .26s var(--ease), transform .26s var(--ease);
}

.page-about .about-daily-item:hover {
  border-color: rgba(244, 85, 43, .5);
  transform: translateY(-3px);
}

.page-about .about-daily-idx {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--flame);
}

.page-about .about-daily-item h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -.005em;
  color: var(--lamp);
}

.page-about .about-daily-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

/* ---------- 体量数据 ---------- */

.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
  margin: clamp(22px, 3vw, 36px) 0 clamp(22px, 3.2vw, 40px);
}

.page-about .about-scale-cell {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-top: 16px;
  border-top: 2px solid var(--flame);
}

.page-about .about-scale-cell:nth-child(2) { border-top-color: var(--data-blue); }
.page-about .about-scale-cell:nth-child(3) { border-top-color: var(--ember); }
.page-about .about-scale-cell:nth-child(4) { border-top-color: var(--mist); }

.page-about .about-scale-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--flame-deep);
}

.page-about .about-scale-cap {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-dim);
}

.page-about .about-topic-groups {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-topic-groups li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-topic-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--pa-paper-ink);
}

.page-about .about-topic-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-dim);
}

/* ---------- 改版时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 clamp(24px, 3.2vw, 38px) clamp(20px, 2.6vw, 34px);
  border-left: 1px solid var(--line);
}

.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 4px rgba(244, 85, 43, .18);
}

.page-about .about-timeline-item:nth-child(2)::before {
  background: var(--ember);
  box-shadow: 0 0 0 4px rgba(255, 154, 92, .22);
}

.page-about .about-timeline-item:nth-child(3)::before {
  background: var(--data-blue);
  box-shadow: 0 0 0 4px rgba(46, 123, 224, .2);
}

.page-about .about-timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--flame-deep);
}

.page-about .about-timeline-item h3 {
  margin: 4px 0 0;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 500;
  color: var(--pa-paper-ink);
}

.page-about .about-timeline-item p {
  margin: 9px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

/* ---------- 校对流程 ---------- */

.page-about .about-review {
  list-style: none;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-review-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 15px 18px;
  border-left: 2px solid var(--flame);
  border-radius: 2px;
  background: rgba(11, 14, 20, .06);
}

.page-about .about-review-item:nth-child(2) { border-left-color: var(--ember); }
.page-about .about-review-item:nth-child(3) { border-left-color: var(--data-blue); }

.page-about .about-review-step {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  white-space: nowrap;
  color: var(--flame-deep);
}

.page-about .about-review-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 合作生态 ---------- */

.page-about .about-wide {
  margin: clamp(22px, 3vw, 38px) 0 0;
}

.page-about .about-wide img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 3px;
  box-shadow: 0 30px 66px -40px rgba(0, 0, 0, .85);
}

.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-partner-cell {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(11, 14, 20, .05);
}

.page-about .about-partner-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--flame-deep);
}

.page-about .about-partner-cell p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-dim);
}

/* ---------- 后续入口 ---------- */

.page-about .about-onward {
  --ink: #12161D;
  --ink-dim: rgba(18, 22, 29, .72);
  --ink-faint: rgba(18, 22, 29, .46);
  --line: rgba(18, 22, 29, .14);
  padding: clamp(56px, 8vw, 112px) 0 clamp(60px, 8vw, 118px);
  background: linear-gradient(180deg, #EDE6DC 0%, #F7F5F2 100%);
  color: var(--ink);
}

.page-about .about-onward-title {
  margin: 12px 0 0;
  max-width: 22ch;
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -.015em;
  color: #12161D;
}

.page-about .about-onward-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(24px, 3vw, 40px);
}

.page-about .about-onward-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 24px;
  border: 1px solid rgba(18, 22, 29, .14);
  border-radius: 3px;
  background: #FFFFFF;
  color: #12161D;
  text-decoration: none;
  transition: transform .26s var(--ease), border-color .26s var(--ease), box-shadow .26s var(--ease);
}

.page-about .about-onward-card:hover,
.page-about .about-onward-card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(244, 85, 43, .55);
  box-shadow: 0 22px 44px -28px rgba(18, 22, 29, .5);
}

.page-about .about-onward-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--flame-deep);
}

.page-about .about-onward-card h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -.005em;
}

.page-about .about-onward-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(18, 22, 29, .68);
}

/* ---------- 响应式 ---------- */

@media (max-width: 979px) {
  .page-about .about-index-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: none;
  }

  .page-about .about-index-list::-webkit-scrollbar {
    display: none;
  }

  .page-about .about-index-link {
    border-left: 0;
    border-bottom: 2px solid var(--line);
    padding: 8px 4px;
    white-space: nowrap;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    padding-left: 4px;
    border-left-color: transparent;
    border-bottom-color: var(--flame);
  }
}

@media (min-width: 620px) {
  .page-about .about-topic-groups li {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 680px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .about-daily {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-stage-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
  }

  .page-about .about-stage-split--rev {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
  }

  .page-about .about-stage-split--rev .about-stage-media {
    order: 2;
  }

  .page-about .about-stage-split--rev .about-stage-text {
    order: 1;
  }
}

@media (min-width: 980px) {
  .page-about .about-chronicle-grid {
    grid-template-columns: var(--pa-index-w) minmax(0, 1fr);
    gap: clamp(44px, 5.5vw, 92px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h, 72px) + 26px);
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-daily-item,
  .page-about .about-onward-card,
  .page-about .about-index-link {
    transition: none;
  }

  .page-about .about-daily-item:hover,
  .page-about .about-onward-card:hover,
  .page-about .about-onward-card:focus-visible {
    transform: none;
  }
}
<<<END>>>