.page-about {
  --ab-line-soft: rgba(43, 67, 90, 0.6);
  --ab-track: clamp(28px, 5vw, 72px);
  display: block;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 4vw, 44px) 0 clamp(44px, 6vw, 76px);
  background:
    radial-gradient(120% 92% at 84% -6%, rgba(215, 169, 75, 0.16), transparent 58%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--ab-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 67, 90, 0.32) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  pointer-events: none;
}

.page-about .ab-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 6.2vw, 58px);
  line-height: 1.14;
  letter-spacing: 0.02em;
  margin: 14px 0 16px;
  color: var(--paper);
}

.page-about .ab-hero__intro {
  max-width: 56ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(245, 239, 227, 0.78);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* 认证标识 */
.page-about .ab-seal {
  position: relative;
  border: 1px solid var(--gold);
  background: rgba(13, 34, 56, 0.78);
  padding: clamp(22px, 3vw, 32px);
  text-align: left;
}

.page-about .ab-seal::before,
.page-about .ab-seal::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--gold);
  pointer-events: none;
}

.page-about .ab-seal::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-seal::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .ab-seal__mark {
  display: block;
  width: 52px;
  height: 62px;
  margin-bottom: 16px;
}

.page-about .ab-seal__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .ab-seal__meta {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .ab-seal__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(245, 239, 227, 0.7);
}

/* 首屏数字 */
.page-about .ab-figures {
  display: grid;
  gap: 20px;
  margin: clamp(34px, 5vw, 54px) 0 0;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .ab-figures__item {
  border-top: 2px solid var(--gold);
  padding-top: 12px;
  min-width: 0;
}

.page-about .ab-figures dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .ab-figures dd {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(245, 239, 227, 0.82);
}

.page-about .ab-figures__num {
  display: inline-block;
  margin-right: 4px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
}

/* ---------- 主体长卷 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: 32px;
  padding-top: clamp(36px, 5vw, 72px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* 章节目录 */
.page-about .ab-toc {
  min-width: 0;
}

.page-about .ab-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .ab-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .ab-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  font-size: 13px;
  color: rgba(245, 239, 227, 0.72);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-toc__list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--stone);
}

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

.page-about .ab-toc__list a[aria-current="true"] {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(215, 169, 75, 0.08);
}

.page-about .ab-toc__list a[aria-current="true"] span {
  color: var(--gold);
}

/* 章节 */
.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-chapter {
  padding: clamp(34px, 5vw, 60px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 18px;
  align-items: end;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .ab-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 84px);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(215, 169, 75, 0.55);
}

.page-about .ab-chapter h2 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-copy p {
  max-width: 66ch;
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(245, 239, 227, 0.8);
}

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

.page-about .ab-chapter a {
  color: var(--gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-chapter a:hover,
.page-about .ab-chapter a:focus-visible {
  color: var(--gold);
}

/* 图片 */
.page-about .ab-figure {
  margin: 0 0 clamp(24px, 3vw, 34px);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--stone);
}

/* 时间轴 */
.page-about .ab-timeline {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 20px 0 0;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .ab-timeline__item::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .ab-timeline__item:has(.ab-timeline__state--jade)::after {
  background: var(--jade);
}

.page-about .ab-timeline__node {
  padding: 0 0 18px;
}

.page-about .ab-timeline__node summary {
  display: block;
  cursor: pointer;
  list-style: none;
  padding: 2px 0;
  outline-offset: 4px;
}

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

.page-about .ab-timeline__node summary::marker {
  content: "";
}

.page-about .ab-timeline__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .ab-timeline__name {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-timeline__state {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  padding: 2px 7px;
  border: 1px solid currentColor;
}

.page-about .ab-timeline__state--done {
  color: var(--stone);
}

.page-about .ab-timeline__state--jade {
  color: var(--jade);
}

.page-about .ab-timeline__node p {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 239, 227, 0.72);
}

.page-about .ab-timeline__node[open] .ab-timeline__name {
  color: var(--gold-soft);
}

.page-about .ab-aside {
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--jade);
  background: rgba(13, 34, 56, 0.6);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 239, 227, 0.78);
}

/* 团队 */
.page-about .ab-teams {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(30px, 4vw, 46px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-team {
  position: relative;
  padding: 20px 18px 20px 22px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .ab-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 2px;
  background: var(--gold);
}

.page-about .ab-team:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .ab-team__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .ab-team h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--paper);
}

.page-about .ab-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 239, 227, 0.72);
}

.page-about .ab-subhead {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--paper);
}

.page-about .ab-subhead__note {
  max-width: 66ch;
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
}

/* 审校路径 */
.page-about .ab-path {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  grid-template-columns: minmax(0, 1fr);
  counter-reset: abpath;
}

.page-about .ab-path__step {
  position: relative;
  padding: 22px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(13, 34, 56, 0.9), rgba(7, 22, 36, 0.9));
}

.page-about .ab-path__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--jade);
  border: 1px solid var(--jade);
  padding: 2px 6px;
}

.page-about .ab-path__step h4 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--paper);
}

.page-about .ab-path__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(245, 239, 227, 0.72);
}

/* ---------- 视觉语言章节（米白纸感） ---------- */
.page-about .ab-chapter--paper {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(30px, 4.5vw, 52px) clamp(18px, 3.4vw, 40px);
  background: var(--parchment);
  border-top: 1px solid var(--gold);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-chapter--paper h2 {
  color: var(--ink);
}

.page-about .ab-chapter--paper .ab-chapter__num {
  -webkit-text-stroke: 1px rgba(191, 107, 79, 0.6);
}

.page-about .ab-chapter--paper .ab-copy p {
  color: rgba(7, 22, 36, 0.82);
}

.page-about .ab-chapter--paper .ab-aside {
  border-left-color: var(--clay);
  background: rgba(7, 22, 36, 0.055);
  color: rgba(7, 22, 36, 0.78);
}

.page-about .ab-swatches {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(24px, 3vw, 34px);
  padding: 0;
  list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .ab-swatch {
  display: grid;
  gap: 8px;
  padding: 12px;
  background: rgba(245, 239, 227, 0.6);
  border: 1px solid rgba(7, 22, 36, 0.16);
}

.page-about .ab-swatch__chip {
  display: block;
  height: 40px;
  border: 1px solid rgba(7, 22, 36, 0.2);
}

.page-about .ab-swatch__name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-swatch__use {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(7, 22, 36, 0.6);
}

.page-about .ab-sw--ink { background: #071624; }
.page-about .ab-sw--blue { background: #0D2238; }
.page-about .ab-sw--gold { background: #D7A94B; }
.page-about .ab-sw--jade { background: #7FB7A3; }
.page-about .ab-sw--clay { background: #BF6B4F; }
.page-about .ab-sw--paper { background: #E8DFCF; }

.page-about .ab-type {
  display: grid;
  gap: 0;
  margin-bottom: clamp(22px, 3vw, 30px);
  border-top: 1px solid rgba(7, 22, 36, 0.2);
}

.page-about .ab-type__row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  margin: 0;
  padding: 14px 0;
  border-bottom: 1px solid rgba(7, 22, 36, 0.16);
}

.page-about .ab-type__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(7, 22, 36, 0.55);
}

.page-about .ab-type__demo {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .ab-type__demo--serif {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
}

.page-about .ab-type__demo--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---------- 收束 CTA ---------- */
.page-about .ab-cta {
  margin-top: clamp(26px, 3.5vw, 40px);
  padding: clamp(24px, 3.4vw, 36px);
  border: 1px solid var(--gold);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(127, 183, 163, 0.16), transparent 62%),
    var(--ink-2);
}

.page-about .ab-cta__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--jade);
}

.page-about .ab-cta__text {
  max-width: 52ch;
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.6;
  color: var(--paper);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }

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

  .page-about .ab-path__step + .ab-path__step::before {
    content: "";
    position: absolute;
    top: 50%;
    left: -14px;
    width: 14px;
    height: 1px;
    background: var(--gold);
  }
}

@media (min-width: 960px) {
  .page-about .ab-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 68px);
    align-items: start;
  }

  .page-about .ab-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .ab-toc__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-toc__list li {
    flex: none;
  }

  .page-about .ab-toc__list a {
    display: flex;
    width: 100%;
    padding: 10px 0 10px 14px;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    white-space: normal;
    font-size: 13.5px;
    line-height: 1.5;
  }

  .page-about .ab-toc__list a[aria-current="true"] {
    background: transparent;
    border-left-color: var(--gold);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .ab-chapter--paper .ab-copy p {
    max-width: 62ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team {
    transition: none;
  }

  .page-about .ab-team:hover {
    transform: none;
  }
}
<<<END>>>