.page-about {
  --about-rail: 168px;
  --about-line: rgba(201, 194, 180, 0.22);
  --about-line-strong: rgba(201, 194, 180, 0.38);
  --about-raised: #101C1F;
  --about-raised-soft: #16262A;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--bone);
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 7vw, 96px);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
  opacity: 0.34;
  filter: saturate(0.82);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 20, 22, 0.82) 0%, rgba(11, 20, 22, 0.55) 42%, var(--night) 100%),
    linear-gradient(100deg, rgba(18, 64, 58, 0.6) 0%, rgba(11, 20, 22, 0) 62%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(28px, 6vw, 72px);
}

.page-about .breadcrumb__link {
  color: var(--ice);
}

.page-about .breadcrumb__list {
  color: var(--bone-dim);
}

.page-about .about-hero__eyebrow {
  color: var(--ice);
  letter-spacing: 0.18em;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 7.2vw, 92px);
  line-height: 1.0;
  letter-spacing: 0.01em;
  margin: 14px 0 0;
  max-width: 15em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 34px) 0 0;
  max-width: 44em;
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--bone-dim);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(36px, 6vw, 72px);
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-fact {
  background: rgba(11, 20, 22, 0.72);
  padding: 18px 16px;
  display: grid;
  gap: 6px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  color: var(--score);
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted-on-dark);
  letter-spacing: 0.02em;
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding: 22px 20px;
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: inherit;
  opacity: 0.6;
}

.page-about .section--night .about-chapter__kicker,
.page-about .about-chapter--last .about-chapter__kicker {
  color: var(--muted-on-dark);
  opacity: 1;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(27px, 4.4vw, 52px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  margin: 0 0 clamp(14px, 2vw, 24px);
}

.page-about .about-chapter__lead {
  margin: 0 0 clamp(22px, 3vw, 36px);
  max-width: 40em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  opacity: 0.86;
}

.page-about .about-prose {
  max-width: 34em;
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
  line-height: 1.85;
}

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

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4.5vw, 76px);
    align-items: start;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 132px;
    display: block;
  }

  .page-about .about-chapter__num {
    display: block;
    font-size: clamp(30px, 3.6vw, 46px);
    margin-bottom: 10px;
  }

  .page-about .about-chapter__kicker {
    display: block;
  }
}

/* ---------- 01 起点 ---------- */

.page-about .about-quote {
  margin-top: clamp(26px, 4vw, 44px);
  padding: 16px 0 16px 20px;
  border-left: 2px solid var(--score);
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(17px, 2vw, 24px);
  line-height: 1.5;
  color: var(--bone);
  max-width: 24em;
}

/* ---------- 02 时间线 ---------- */

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

.page-about .about-timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 6px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 11px;
  height: 11px;
  background: var(--clay);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 27px;
  bottom: -6px;
  width: 1px;
  background: var(--hairline);
  opacity: 0.5;
}

.page-about .about-timeline__item:last-child::after {
  display: none;
}

.page-about .about-node {
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 4px;
}

.page-about .about-node__summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 10px 0 14px;
  align-items: baseline;
  transition: color 0.18s var(--ease);
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__summary:hover {
  color: var(--clay);
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

.page-about .about-node__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--clay);
  text-transform: uppercase;
  white-space: nowrap;
  padding-top: 3px;
}

.page-about .about-node__name {
  font-size: clamp(15.5px, 1.6vw, 18px);
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-node__hint {
  grid-column: 2;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  opacity: 0.6;
}

.page-about .about-node__panel {
  padding: 0 0 16px;
}

.page-about .about-node__panel p {
  margin: 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.85;
  opacity: 0.85;
}

.page-about .about-node[open] .about-node__name {
  color: var(--clay);
}

/* ---------- 03 团队 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-split__figure {
  margin: 0;
}

.page-about .about-roles {
  margin: 1.6em 0;
  padding: 0;
}

.page-about .about-role {
  padding: 14px 0 16px;
  border-top: 1px solid var(--hairline);
}

.page-about .about-role:last-child {
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-role dt {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: 8px;
}

.page-about .about-role dt .numeric {
  font-family: var(--font-mono);
  color: var(--clay);
  font-size: 17px;
}

.page-about .about-role dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  opacity: 0.85;
}

@media (min-width: 1000px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-split__figure {
    position: sticky;
    top: 140px;
  }
}

/* ---------- 04 类目地图 ---------- */

.page-about .about-map__figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

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

.page-about .about-cat {
  background: var(--about-raised);
  padding: 18px 18px 16px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 12px;
  transition: background 0.18s var(--ease);
}

.page-about .about-cat:hover {
  background: var(--grass-deep);
}

.page-about .about-cat__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ice);
  padding-top: 4px;
}

.page-about .about-cat__name {
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-cat__desc {
  grid-column: 1 / -1;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted-on-dark);
}

.page-about .about-cat__bar {
  grid-column: 1 / -1;
  display: block;
  height: 3px;
  background: rgba(201, 194, 180, 0.16);
  margin-top: 4px;
}

.page-about .about-cat__bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--ice) 0%, var(--score) 100%);
}

.page-about .about-cats > .about-cat:nth-child(1) .about-cat__bar i { width: 100%; }
.page-about .about-cats > .about-cat:nth-child(2) .about-cat__bar i { width: 88%; }
.page-about .about-cats > .about-cat:nth-child(3) .about-cat__bar i { width: 72%; }
.page-about .about-cats > .about-cat:nth-child(4) .about-cat__bar i { width: 58%; }
.page-about .about-cats > .about-cat:nth-child(5) .about-cat__bar i { width: 66%; }
.page-about .about-cats > .about-cat:nth-child(6) .about-cat__bar i { width: 44%; }

.page-about .about-map__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-on-dark);
  max-width: 38em;
}

@media (min-width: 640px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .about-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 05 作者网络 ---------- */

.page-about .about-authors {
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  margin-bottom: clamp(24px, 3.5vw, 40px);
}

.page-about .about-author-line {
  background: var(--bone-dim);
  padding: 20px 0 22px;
}

.page-about .about-author-line__title {
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: 0.04em;
}

.page-about .about-author-line__title::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  background: var(--moss);
  margin-right: 10px;
  vertical-align: 1px;
}

.page-about .about-author-line__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  max-width: 40em;
  opacity: 0.85;
}

.page-about .about-author-ledger {
  margin-bottom: clamp(24px, 3.5vw, 36px);
}

.page-about .about-authors__cta {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  max-width: 42em;
}

.page-about .about-link {
  color: var(--clay);
  text-decoration: none;
  border-bottom: 1px solid var(--clay);
  padding-bottom: 1px;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-link:hover {
  color: var(--grass-deep);
  border-color: var(--grass-deep);
}

.page-about .about-link:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
}

@media (min-width: 880px) {
  .page-about .about-authors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-author-line {
    padding: 22px 22px 24px;
  }
}

/* ---------- 06 荣誉 ---------- */

.page-about .about-honors {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .about-honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  padding: 15px 0 16px;
  border-bottom: 1px solid var(--about-line);
  transition: border-color 0.18s var(--ease);
}

.page-about .about-honor:hover {
  border-bottom-color: var(--score);
}

.page-about .about-honor__name {
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.6;
  max-width: 34em;
}

.page-about .about-honor__when {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ice);
  opacity: 0.5;
  transition: opacity 0.18s var(--ease);
  white-space: nowrap;
}

.page-about .about-honor:hover .about-honor__when {
  opacity: 1;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 滚动显现 ---------- */

.page-about .reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-about .reveal.is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 收尾按钮在窄屏铺满 ---------- */

@media (max-width: 520px) {
  .page-about .about-actions {
    flex-direction: column;
  }

  .page-about .about-actions .btn {
    width: 100%;
    text-align: center;
  }
}
<<<END>>>