.page-about {
  --about-ink: #0A1A2F;
  --about-space: 64px;
  padding-bottom: 104px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin-top: 20px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.12em;
  color: var(--l-yellow);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 0 0 32px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-hero__facts > li {
  background: var(--panel);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--l-yellow);
}

.page-about .about-hero__flabel {
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 32px 0 0;
}

.page-about .about-figure .figure__media,
.page-about .verify-figure .figure__media {
  border: 1px solid var(--rule);
  background: var(--night);
  overflow: hidden;
}

.page-about .about-figure .figure__media img,
.page-about .verify-figure .figure__media img,
.page-about .crew-figure .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: var(--about-space);
}

.page-about .about-section__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--l-yellow);
}

.page-about .about-section__line {
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.page-about .about-section__body {
  padding: 24px 20px 28px;
}

.page-about .about-section__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.3;
  font-weight: 900;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-about .about-section__lede {
  margin: 0 0 24px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 事实行 ---------- */
.page-about .facts-row {
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.page-about .facts-row__cell {
  background: var(--panel);
  padding: 14px 14px 16px;
}

.page-about .facts-row dt {
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .facts-row dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .facts-row .num,
.page-about .verify-steps__idx,
.page-about .review-cell__num,
.page-about .cadence__when,
.page-about .timeline__era,
.page-about .paper-stack__idx,
.page-about .crew__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 人员分工 ---------- */
.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .crew__group {
  background: var(--night);
  padding: 18px 16px 20px;
  border-left: 3px solid var(--rule);
}

.page-about .crew__group--blue { border-left-color: var(--l-blue); }
.page-about .crew__group--yellow { border-left-color: var(--l-yellow); }
.page-about .crew__group--green { border-left-color: var(--l-green); }
.page-about .crew__group--red { border-left-color: var(--l-red); }

.page-about .crew__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .crew__count {
  font-size: 20px;
  line-height: 1;
  color: var(--paper);
}

.page-about .crew__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .crew__desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .crew__out {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.04em;
  color: var(--l-blue);
}

.page-about .crew-figure {
  margin: 28px 0 0;
}

.page-about .crew-figure .figure__media {
  border: 1px solid var(--rule);
  background: var(--night);
  overflow: hidden;
}

/* ---------- 核对流程 ---------- */
.page-about .verify-figure {
  margin: 0 0 28px;
}

.page-about .verify-map {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 0 0 24px;
}

.page-about .verify-map__line {
  fill: none;
  stroke: var(--l-blue);
  stroke-width: 2;
  stroke-dasharray: 6 6;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .verify-map__node circle {
  fill: var(--night);
  stroke: var(--l-yellow);
  stroke-width: 2;
}

.page-about .verify-map__node text {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--l-yellow);
  letter-spacing: 0.04em;
}

.page-about .verify-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .verify-steps__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--rule);
}

.page-about .verify-steps__idx {
  font-size: 14px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--l-green);
}

.page-about .verify-steps__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--paper);
}

.page-about .verify-steps__desc {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .verify-steps__out {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.04em;
  color: var(--l-yellow);
}

.page-about .verify-note {
  margin: 24px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--l-blue);
  background: var(--panel-raise);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 证据等级 ---------- */
.page-about .evidence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .evidence__card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--night);
  border: 1px solid var(--rule);
  border-top-width: 3px;
}

.page-about .evidence__card--a { border-top-color: var(--l-green); }
.page-about .evidence__card--b { border-top-color: var(--l-yellow); }
.page-about .evidence__card--c { border-top-color: var(--red-bright); }

.page-about .evidence__name {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.3;
  font-weight: 900;
  color: var(--paper);
}

.page-about .evidence__desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .evidence__ex {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper);
  opacity: 0.82;
}

.page-about .evidence-foot {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 12px;
}

.page-about .evidence-foot__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .evidence-foot__link {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .cadence__when {
  font-size: 13px;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--l-blue);
}

.page-about .cadence__what {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .cadence__sub {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--paper);
}

/* ---------- 外部审读 ---------- */
.page-about .review-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .review-cell {
  background: var(--panel-raise);
  padding: 18px 16px 20px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.page-about .review-cell__num {
  font-size: 26px;
  line-height: 1;
  color: var(--l-green);
  flex: 0 0 auto;
}

.page-about .review-cell__txt {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin-top: 8px;
}

.page-about .timeline__track {
  list-style: none;
  margin: 0;
  padding: 4px 0 18px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .timeline__stop {
  flex: 0 0 84%;
  scroll-snap-align: start;
  background: var(--night);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--l-blue);
  padding: 18px 16px 20px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
}

.page-about .timeline__stop:last-child {
  border-top-color: var(--l-yellow);
}

.page-about .timeline__era {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 12px;
  padding: 4px 8px;
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.1em;
  color: var(--night);
  background: var(--l-blue);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .timeline__stop:last-child .timeline__era {
  background: var(--l-yellow);
}

.page-about .timeline__label {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .timeline__aside {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 纸张叠层小结 ---------- */
.page-about .paper-stack {
  position: relative;
  margin-top: var(--about-space);
  padding-top: 20px;
}

.page-about .paper-stack__sheet {
  background: var(--cream);
  color: var(--about-ink);
}

.page-about .paper-stack__sheet--back,
.page-about .paper-stack__sheet--mid {
  position: absolute;
  left: 0;
  right: 0;
  height: 40px;
  border: 1px solid var(--rule);
}

.page-about .paper-stack__sheet--back {
  top: 0;
  transform: translate(16px, 0);
  opacity: 0.32;
}

.page-about .paper-stack__sheet--mid {
  top: 10px;
  transform: translate(8px, 0);
  opacity: 0.55;
}

.page-about .paper-stack__sheet--front {
  position: relative;
  padding: 26px 20px 28px;
  border: 1px solid rgba(10, 26, 47, 0.35);
}

.page-about .paper-stack__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.12em;
  color: #1F5F9E;
}

.page-about .paper-stack__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.32;
  font-weight: 900;
  color: var(--about-ink);
}

.page-about .paper-stack__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.page-about .paper-stack__list > li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid rgba(10, 26, 47, 0.18);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(10, 26, 47, 0.86);
}

.page-about .paper-stack__idx {
  font-size: 13px;
  line-height: 1.7;
  color: #1F5F9E;
}

.page-about .paper-stack__foot {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid rgba(10, 26, 47, 0.18);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(10, 26, 47, 0.8);
}

.page-about .paper-stack a {
  color: #14487C;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 正文与链接 ---------- */
.page-about .prose p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .prose p + p {
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.page-about .about-section__body a,
.page-about .paper-stack__foot a {
  color: var(--l-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-section__body a:hover {
  color: var(--l-yellow);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .facts-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .evidence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .review-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .timeline__stop {
    flex-basis: 46%;
  }
  .page-about .cadence__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about {
    --about-space: 96px;
  }
  .page-about .about-hero {
    margin-top: 32px;
    padding-bottom: 40px;
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "kicker kicker"
      "title  facts"
      "lede   facts";
    column-gap: 48px;
    row-gap: 0;
    align-items: start;
  }
  .page-about .about-hero__kicker { grid-area: kicker; }
  .page-about .about-hero__title {
    grid-area: title;
    font-size: 46px;
    line-height: 1.1;
    max-width: 18ch;
    margin-bottom: 22px;
  }
  .page-about .about-hero__lede {
    grid-area: lede;
    margin-bottom: 0;
  }
  .page-about .about-hero__facts {
    grid-area: facts;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-self: start;
  }
  .page-about .about-hero__num { font-size: 26px; }

  .page-about .about-section {
    grid-template-columns: 60px minmax(0, 1fr);
    column-gap: 36px;
    gap: 0;
    align-items: start;
  }
  .page-about .about-section__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding-top: 24px;
    position: sticky;
    top: 96px;
  }
  .page-about .about-section__num {
    font-size: 30px;
    margin-bottom: 14px;
  }
  .page-about .about-section__line {
    flex: 0 0 auto;
    width: 1px;
    height: 96px;
    background: var(--rule);
  }
  .page-about .about-section__body {
    padding: 32px 34px 36px;
  }
  .page-about .about-section__title {
    font-size: 28px;
    line-height: 1.28;
  }

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

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

  .page-about .verify-steps__item {
    grid-template-columns: 64px minmax(0, 1fr);
    column-gap: 22px;
    align-items: start;
  }
  .page-about .verify-steps__idx {
    font-size: 16px;
    padding-top: 3px;
  }

  .page-about .crew-figure {
    max-width: 620px;
  }

  .page-about .timeline__stop {
    flex-basis: 300px;
    min-height: 220px;
  }

  .page-about .paper-stack {
    margin-left: 96px;
    max-width: 780px;
  }
  .page-about .paper-stack__sheet--front {
    padding: 34px 38px 36px;
  }
  .page-about .paper-stack__title { font-size: 26px; }
}

@media (min-width: 1120px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
  .page-about .about-hero__title { font-size: 54px; }
  .page-about .evidence__card,
  .page-about .about-section__body {
    padding-left: 40px;
    padding-right: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-section__rail { position: static; }
}
<<<END>>>