.page-about {
  --ab-muted: #5B6764;
  --ab-hair: 1px solid var(--grey);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ff-body);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: 16px;
}

.page-about .ab-crumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--ab-muted);
}

.page-about .ab-crumb__list a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .ab-crumb__list a:hover,
.page-about .ab-crumb__list a:focus-visible {
  border-bottom-color: var(--lake);
}

.page-about .ab-crumb__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--grey);
}

/* 首屏 */
.page-about .ab-hero {
  margin-top: 12px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: linear-gradient(180deg, var(--paper) 0%, var(--white) 100%);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: 24px;
  padding-top: 26px;
  padding-bottom: 34px;
}

.page-about .ab-eyebrow {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange-deep);
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: clamp(34px, 8.4vw, 62px);
  line-height: 1.03;
  letter-spacing: 0.01em;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--lake);
}

.page-about .ab-hero__lede {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .ab-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
  margin: 22px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: var(--ab-hair);
}

.page-about .ab-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .ab-hero__num {
  font-family: var(--ff-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .ab-hero__lbl {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ab-muted);
}

.page-about .ab-hero__panel {
  background: var(--teal);
  color: var(--white);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-hero__panel-label {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .ab-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-hero__panel-foot {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid rgba(220, 235, 237, 0.28);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* 正文骨架 */
.page-about .ab-body {
  display: grid;
  gap: 30px;
  padding-top: 32px;
  padding-bottom: 54px;
}

.page-about .ab-toc {
  border-left: 2px solid var(--ink);
  padding-left: 14px;
}

.page-about .ab-toc__title {
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ab-muted);
}

.page-about .ab-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 4px 0;
  font-size: 13.5px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  color: var(--lake);
  border-bottom-color: var(--lake);
}

.page-about .ab-toc__no {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-about .ab-flow {
  display: grid;
  gap: 40px;
  min-width: 0;
}

/* 章节 */
.page-about .ab-sec {
  border-top: 1px solid var(--ink);
  padding-top: 16px;
  min-width: 0;
}

.page-about .ab-sec__no {
  margin: 0 0 8px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange-deep);
}

.page-about .ab-sec__title {
  margin: 0 0 12px;
  font-family: var(--ff-serif);
  font-weight: 700;
  font-size: clamp(23px, 5vw, 34px);
  line-height: 1.32;
  letter-spacing: 0.01em;
}

.page-about .ab-sec__lede {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-muted);
}

.page-about .ab-prose p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
}

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

.page-about .ab-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  background: var(--mist);
  border-left: 3px solid var(--lake);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* 图片 */
.page-about .ab-figure {
  margin: 18px 0 22px;
  border: var(--ab-hair);
  background: var(--white);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .ab-figure--side {
  margin: 0;
}

.page-about .ab-figure--side img {
  aspect-ratio: 4 / 3;
}

.page-about .ab-figure figcaption {
  padding: 9px 12px;
  border-top: var(--ab-hair);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--ab-muted);
}

/* 栏目分组 */
.page-about .ab-runway {
  display: grid;
  gap: 10px;
  margin: 4px 0 24px;
}

.page-about .ab-runway__item {
  background: var(--white);
  border: var(--ab-hair);
  border-left: 3px solid var(--lake);
  padding: 13px 15px;
}

.page-about .ab-runway__title {
  margin: 0 0 6px;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--teal);
}

.page-about .ab-runway__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink);
}

/* 机制编号列表 */
.page-about .ab-mech {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--ab-hair);
}

.page-about .ab-mech li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding: 13px 0;
  border-bottom: var(--ab-hair);
}

.page-about .ab-mech li > span {
  font-family: var(--ff-mono);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--orange-deep);
  padding-top: 3px;
}

.page-about .ab-mech p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .ab-mech strong {
  color: var(--teal);
}

/* 版本时间线 */
.page-about .ab-stages {
  display: grid;
  gap: 10px;
  margin-top: 18px;
  border-top: 2px solid var(--ink);
  padding-top: 16px;
}

.page-about .ab-stages .accordion__item {
  position: relative;
  background: var(--white);
  border: var(--ab-hair);
  border-top: 3px solid var(--gold);
  min-width: 0;
}

.page-about .ab-stages .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 13px 12px;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-stages .accordion__trigger:hover,
.page-about .ab-stages .accordion__trigger:focus-visible {
  background: var(--mist);
}

.page-about .ab-stage__no {
  font-family: var(--ff-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--lake);
  letter-spacing: 0.02em;
}

.page-about .ab-stage__name {
  font-family: var(--ff-display);
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .ab-stages .accordion__panel {
  padding: 0 12px 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ab-muted);
  border-top: 1px dashed var(--grey);
  margin-top: 0;
}

.page-about .ab-stages .accordion__panel p {
  margin: 10px 0 0;
}

.page-about .accordion__sign {
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--ff-mono);
  font-size: 14px;
  color: var(--orange);
}

/* 流程 */
.page-about .ab-work {
  display: grid;
  gap: 20px;
  margin-top: 6px;
}

.page-about .ab-steps {
  border-top: var(--ab-hair);
}

.page-about .ab-steps .accordion__item {
  border-bottom: var(--ab-hair);
}

.page-about .ab-steps .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 13px 0;
  background: none;
  border: 0;
  font: inherit;
  font-family: var(--ff-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-about .ab-steps .accordion__trigger:hover,
.page-about .ab-steps .accordion__trigger:focus-visible {
  color: var(--lake);
}

.page-about .ab-steps__no {
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--white);
  background: var(--lake);
  padding: 2px 6px;
  letter-spacing: 0.06em;
}

.page-about .ab-steps .accordion__panel {
  padding: 0 0 15px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .ab-steps .accordion__panel p {
  margin: 0;
}

/* 团队表 */
.page-about .ab-tablewrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: var(--ab-hair);
  background: var(--white);
  margin-top: 16px;
}

.page-about .ab-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 13.5px;
}

.page-about .ab-table th,
.page-about .ab-table td {
  text-align: left;
  padding: 11px 12px;
  vertical-align: top;
}

.page-about .ab-table thead th {
  background: var(--ink);
  color: var(--white);
  font-family: var(--ff-display);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.1em;
}

.page-about .ab-table tbody th {
  color: var(--teal);
  font-weight: 700;
  white-space: nowrap;
  border-top: var(--ab-hair);
}

.page-about .ab-table tbody td {
  border-top: var(--ab-hair);
  line-height: 1.68;
  color: var(--ink);
}

.page-about .ab-table tbody tr:hover th,
.page-about .ab-table tbody tr:hover td {
  background: var(--mist);
}

/* 色板 */
.page-about .ab-swatches {
  display: grid;
  gap: 8px;
  margin: 18px 0 4px;
  padding: 0;
  list-style: none;
}

.page-about .ab-swatch {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 10px;
  background: var(--white);
  border: var(--ab-hair);
}

.page-about .ab-swatch__chip {
  display: block;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(20, 32, 31, 0.16);
}

.page-about .ab-swatch--paper .ab-swatch__chip { background: var(--paper); }
.page-about .ab-swatch--ink .ab-swatch__chip { background: var(--ink); }
.page-about .ab-swatch--lake .ab-swatch__chip { background: var(--lake); }
.page-about .ab-swatch--teal .ab-swatch__chip { background: var(--teal); }
.page-about .ab-swatch--orange .ab-swatch__chip { background: var(--orange); }
.page-about .ab-swatch--gold .ab-swatch__chip { background: var(--gold); }

.page-about .ab-swatch__body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.page-about .ab-swatch__body strong {
  font-family: var(--ff-display);
  font-size: 15.5px;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .ab-swatch__hex {
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--lake);
}

.page-about .ab-swatch__use {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ab-muted);
}

/* 延伸入口 */
.page-about .ab-next {
  border-top: 1px solid var(--ink);
  padding-top: 16px;
}

.page-about .ab-next__links {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.page-about .ab-next__link {
  display: grid;
  gap: 3px;
  padding: 13px 14px;
  background: var(--white);
  border: var(--ab-hair);
  border-left: 3px solid var(--lake);
  text-decoration: none;
  color: var(--ink);
  transition: background var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  background: var(--mist);
  border-left-color: var(--orange);
}

.page-about .ab-next__no {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .ab-next__link strong {
  font-family: var(--ff-display);
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--teal);
}

.page-about .ab-next__link span:last-child {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ab-muted);
}

/* 平板与桌面 */
@media (min-width: 620px) {
  .page-about .ab-runway {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .page-about .ab-swatches {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .ab-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.82fr);
    align-items: end;
    gap: 38px;
    padding-top: 34px;
    padding-bottom: 44px;
  }

  .page-about .ab-hero__lede {
    font-size: 16.5px;
  }

  .page-about .ab-work {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .ab-stages {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
    align-items: start;
  }

  .page-about .ab-stages .accordion__trigger {
    flex-wrap: wrap;
    gap: 6px;
  }

  .page-about .ab-stage__name {
    flex: 1 1 100%;
    font-size: 14.5px;
  }

  .page-about .ab-stages .accordion__sign {
    margin-left: auto;
  }

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

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

@media (min-width: 1040px) {
  .page-about .ab-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
    padding-top: 38px;
    padding-bottom: 64px;
  }

  .page-about .ab-toc {
    position: sticky;
    top: calc(var(--top-h) + 18px);
  }

  .page-about .ab-toc__list {
    display: grid;
    gap: 2px;
  }

  .page-about .ab-flow {
    gap: 48px;
  }

  .page-about .ab-sec {
    padding-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .accordion__trigger,
  .page-about .ab-next__link {
    transition: none;
  }
}
<<<END>>>