.page-about {
  --ab-shift: 0;
  --ab-gold-line: linear-gradient(180deg, rgba(201, 162, 39, 0), var(--cg-gold) 10%, var(--cg-gold) 90%, rgba(201, 162, 39, 0));
  color: var(--cg-ink);
}

.page-about .cg-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cg-mute);
}

.page-about .cg-breadcrumb__item + .cg-breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--cg-edge);
}

.page-about .cg-breadcrumb__link {
  color: var(--cg-gold-deep);
  text-decoration: none;
}

.page-about .cg-breadcrumb__link:hover,
.page-about .cg-breadcrumb__link:focus-visible {
  color: var(--cg-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding: 26px 0 52px;
  border-bottom: 1px solid var(--cg-edge);
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(201, 162, 39, .16), transparent 62%),
    repeating-linear-gradient(90deg, rgba(216, 203, 174, .34) 0 1px, transparent 1px 120px),
    var(--cg-sand);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-family: var(--cg-serif);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.24;
  letter-spacing: .05em;
}

.page-about .ab-hero__lead {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: #33322c;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-hero__plate {
  padding: 26px 22px;
  border-top: 3px solid var(--cg-gold);
  background: var(--cg-ink-green);
  color: var(--cg-sand);
  box-shadow: var(--cg-sheet-shadow);
}

.page-about .ab-hero__plate-label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--cg-gold-pale);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  margin: 0;
}

.page-about .ab-hero__stat dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cg-gold-pale);
}

.page-about .ab-hero__stat dd {
  margin: 6px 0 0;
  font-family: var(--cg-mono);
  font-size: 26px;
  line-height: 1.1;
  color: #fff;
}

.page-about .ab-hero__plate-note {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(232, 217, 166, .28);
  font-size: 13px;
  line-height: 1.7;
  color: var(--cg-gold-pale);
}

/* 双栏骨架 */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-top: 36px;
  padding-bottom: 72px;
}

.page-about .ab-bookmarks {
  border-top: 2px solid var(--cg-gold);
  padding-top: 12px;
}

.page-about .ab-bookmarks__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--cg-mute);
}

.page-about .ab-bookmarks__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-bookmarks__item {
  flex: 0 0 auto;
}

.page-about .ab-bookmarks__link {
  display: block;
  padding: 7px 12px;
  border: 1px solid var(--cg-edge);
  background: var(--cg-paper);
  color: var(--cg-green);
  font-size: 13px;
  letter-spacing: .06em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .16s ease, color .16s ease, background-color .16s ease;
}

.page-about .ab-bookmarks__link:hover,
.page-about .ab-bookmarks__link:focus-visible {
  border-color: var(--cg-gold);
  background: var(--cg-gold-pale);
  color: var(--cg-ink);
  outline: none;
}

.page-about .ab-flow {
  display: grid;
  gap: 52px;
  min-width: 0;
}

.page-about .ab-sec {
  min-width: 0;
}

.page-about .ab-sec__title {
  margin: 8px 0 0;
  font-family: var(--cg-serif);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.3;
  letter-spacing: .06em;
}

.page-about .ab-sec__lead {
  max-width: 36em;
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: #33322c;
}

/* 时间线 */
.page-about .ab-path {
  background: var(--cg-ink-green);
  color: var(--cg-sand);
  padding: 30px 22px;
  border-top: 3px solid var(--cg-gold);
  box-shadow: var(--cg-sheet-shadow);
}

.page-about .ab-path .cg-section__eyebrow,
.page-about .ab-path .ab-sec__lead {
  color: var(--cg-gold-pale);
}

.page-about .ab-path .ab-sec__title {
  color: #fff;
}

.page-about .ab-path__inner {
  display: grid;
  gap: 26px;
}

.page-about .ab-path__visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(201, 162, 39, .38);
  background: var(--cg-green);
}

.page-about .ab-path__visual img {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: cover;
  opacity: .62;
  filter: saturate(.85);
}

.page-about .ab-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 36px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 14px;
  width: 2px;
  background: var(--ab-gold-line);
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 26px;
  cursor: default;
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 4px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cg-gold);
  border-radius: 50%;
  background: var(--cg-ink-green);
  transition: background-color .16s ease, transform .16s ease;
}

.page-about .ab-node:hover::before,
.page-about .ab-node:focus-visible::before,
.page-about .ab-node:focus-within::before {
  background: var(--cg-gold);
  transform: scale(1.15);
}

.page-about .ab-node:focus-visible {
  outline: 2px solid var(--cg-gold);
  outline-offset: 6px;
}

.page-about .ab-node__year {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cg-gold);
}

.page-about .ab-node__title {
  margin: 4px 0 0;
  font-family: var(--cg-serif);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .05em;
  color: #fff;
}

.page-about .ab-node__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cg-sand);
}

.page-about .ab-node__extra {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cg-gold-pale);
  transition: max-height .24s ease, opacity .24s ease, margin-top .24s ease;
}

.page-about .ab-node:hover .ab-node__extra,
.page-about .ab-node:focus-within .ab-node__extra,
.page-about .ab-node:focus-visible .ab-node__extra {
  max-height: 140px;
  margin-top: 10px;
  opacity: 1;
}

/* 归档四要素 */
.page-about .ab-archive {
  border-top: 1px solid var(--cg-gold-pale);
  padding-top: 26px;
}

.page-about .ab-factors__hint {
  margin: 22px 0 12px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cg-mute);
}

.page-about .ab-factors {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-factor {
  border: 1px solid var(--cg-edge);
  border-left: 3px solid var(--cg-gold);
  background: var(--cg-paper);
  box-shadow: var(--cg-sheet-shadow);
}

.page-about .ab-factor__sum {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-factor__sum:focus-visible {
  outline: 2px solid var(--cg-gold);
  outline-offset: -2px;
}

.page-about .ab-factor__num {
  font-size: 12px;
  color: var(--cg-gold-deep);
}

.page-about .ab-factor__name {
  font-family: var(--cg-serif);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--cg-ink-green);
}

.page-about .ab-factor[open] .ab-factor__name {
  color: var(--cg-copper);
}

.page-about .ab-factor__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: #3a3931;
}

.page-about .ab-archive__figure {
  margin: 26px 0 0;
}

.page-about .ab-archive__figure img,
.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--cg-edge);
  background: var(--cg-gold-pale);
}

/* 团队 */
.page-about .ab-team-wrap {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__item {
  padding: 16px 18px;
  border-top: 2px solid var(--cg-green);
  background: var(--cg-paper);
  box-shadow: var(--cg-sheet-shadow);
}

.page-about .ab-team__count {
  display: block;
  font-size: 24px;
  line-height: 1;
  color: var(--cg-gold-deep);
}

.page-about .ab-team__name {
  margin: 8px 0 0;
  font-family: var(--cg-serif);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .ab-team__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3a3931;
}

.page-about .ab-team__figure {
  margin: 0;
}

.page-about .ab-team__note {
  margin-top: 22px;
}

.page-about .ab-team__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
}

/* 省事原则 */
.page-about .ab-principles-sec {
  padding: 26px 20px;
  background: var(--cg-gold-pale);
  border-top: 2px solid var(--cg-gold);
}

.page-about .ab-principles {
  display: grid;
  gap: 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .ab-principle {
  padding: 4px 0 4px 16px;
  border-left: 4px solid var(--cg-gold-deep);
}

.page-about .ab-principle__index {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cg-gold-deep);
}

.page-about .ab-principle__title {
  margin: 6px 0 0;
  font-family: var(--cg-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--cg-ink-green);
}

.page-about .ab-principle__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: #35342c;
}

/* 问答 */
.page-about .ab-qa {
  border-top: 1px solid var(--cg-gold-pale);
  padding-top: 26px;
}

.page-about .ab-q {
  border-bottom: 1px solid var(--cg-edge);
  background: var(--cg-paper);
}

.page-about .ab-q:first-of-type {
  margin-top: 20px;
  border-top: 1px solid var(--cg-edge);
}

.page-about .ab-q__q {
  position: relative;
  padding: 16px 40px 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--cg-serif);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--cg-ink-green);
}

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

.page-about .ab-q__q::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--cg-mono);
  font-size: 18px;
  color: var(--cg-gold-deep);
}

.page-about .ab-q[open] .ab-q__q::after {
  content: "−";
}

.page-about .ab-q__q:focus-visible {
  outline: 2px solid var(--cg-gold);
  outline-offset: -2px;
}

.page-about .ab-q__a {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.85;
  color: #3a3931;
}

/* 继续往下走 */
.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .ab-next__card {
  display: block;
  padding: 20px 18px;
  border: 1px solid var(--cg-edge);
  border-bottom: 3px solid var(--cg-gold);
  background: var(--cg-sand);
  color: inherit;
  text-decoration: none;
  transition: border-color .16s ease, transform .16s ease, background-color .16s ease;
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: var(--cg-gold-deep);
  background: var(--cg-paper);
  transform: translateY(-2px);
  outline: none;
}

.page-about .ab-next__num {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cg-gold-deep);
}

.page-about .ab-next__card-title {
  margin: 8px 0 0;
  font-family: var(--cg-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--cg-ink-green);
}

.page-about .ab-next__card-text {
  margin: 8px 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: #3a3931;
}

.page-about .ab-next__more {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cg-gold-deep);
  border-bottom: 1px solid var(--cg-gold);
  padding-bottom: 2px;
}

/* 中等屏 */
@media (min-width: 640px) {
  .page-about .ab-factors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-factor:nth-child(2) {
    margin-top: 18px;
  }

  .page-about .ab-factor:nth-child(3) {
    margin-top: -4px;
  }

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

  .page-about .ab-team__item:nth-child(even) {
    margin-top: 16px;
  }

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

  .page-about .ab-path__visual img {
    height: 240px;
  }
}

/* 桌面双栏错位 */
@media (min-width: 960px) {
  .page-about .ab-hero {
    padding: 34px 0 66px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: 1.18fr .82fr;
    align-items: start;
    gap: 52px;
  }

  .page-about .ab-hero__plate {
    padding: 32px 28px;
  }

  .page-about .ab-layout {
    grid-template-columns: 22% minmax(0, 1fr);
    gap: 44px;
    padding-top: 52px;
  }

  .page-about .ab-bookmarks {
    position: sticky;
    top: 88px;
    align-self: start;
    border-top: none;
    padding-top: 0;
  }

  .page-about .ab-bookmarks__label {
    padding-bottom: 8px;
    border-bottom: 1px solid var(--cg-gold);
  }

  .page-about .ab-bookmarks__list {
    flex-direction: row;
    align-items: flex-start;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }

  .page-about .ab-bookmarks__link {
    writing-mode: vertical-rl;
    padding: 14px 9px;
    border: 1px solid var(--cg-edge);
    border-top: 2px solid var(--cg-green);
    background: var(--cg-paper);
    font-size: 13px;
    letter-spacing: .16em;
    line-height: 1.1;
    white-space: normal;
  }

  .page-about .ab-bookmarks__link:hover,
  .page-about .ab-bookmarks__link:focus-visible {
    border-top-color: var(--cg-gold);
    background: var(--cg-gold-pale);
  }

  .page-about .ab-flow > .ab-sec:nth-child(1) { margin-left: 0; }
  .page-about .ab-flow > .ab-sec:nth-child(2) { margin-left: 24px; }
  .page-about .ab-flow > .ab-sec:nth-child(3) { margin-left: 48px; }
  .page-about .ab-flow > .ab-sec:nth-child(4) { margin-left: 72px; }
  .page-about .ab-flow > .ab-sec:nth-child(5) { margin-left: 48px; }
  .page-about .ab-flow > .ab-sec:nth-child(6) { margin-left: 24px; }

  .page-about .ab-path {
    padding: 40px 34px;
  }

  .page-about .ab-path__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .55fr);
    gap: 34px;
    align-items: stretch;
  }

  .page-about .ab-path__visual {
    align-self: stretch;
    display: flex;
  }

  .page-about .ab-path__visual img {
    height: 100%;
    min-height: 320px;
  }

  .page-about .ab-factors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 20px;
  }

  .page-about .ab-factor:nth-child(2) { margin-top: 22px; }
  .page-about .ab-factor:nth-child(3) { margin-top: -6px; }
  .page-about .ab-factor:nth-child(4) { margin-top: 16px; }

  .page-about .ab-team-wrap {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .ab-team__figure {
    margin-top: 16px;
  }

  .page-about .ab-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .ab-principle:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .ab-principle:nth-child(3) {
    margin-top: 40px;
  }

  .page-about .ab-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-next__card:nth-child(even) {
    margin-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node__extra,
  .page-about .ab-next__card,
  .page-about .ab-bookmarks__link,
  .page-about .ab-factor__sum {
    transition: none;
  }

  .page-about .ab-node__extra {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}
<<<END>>>