.page-about {
  --ab-idx-w: 178px;
  --ab-num-op: 0.28;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin: 4px 0 clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-hero h1 {
  font-size: clamp(32px, 5.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  font-weight: 800;
  margin: 0.32em 0 0.55em;
}

.page-about .ab-hero__lead {
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--fg-2);
  margin: 0;
  max-width: 44em;
}

.page-about .ab-stats {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .ab-stats li {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 16px 18px;
}

.page-about .ab-stats b {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--cy-soft);
}

.page-about .ab-stats b em {
  font-style: normal;
  font-size: 0.6em;
  margin-left: 2px;
  color: var(--cy);
}

.page-about .ab-stats span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-2);
}

/* ---------- 分类标签水平索引条 ---------- */
.page-about .ab-tagstrip {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow-x: auto;
  padding: 14px 0;
  margin-bottom: clamp(28px, 4vw, 52px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-tagstrip::-webkit-scrollbar {
  height: 4px;
}

.page-about .ab-tagstrip::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 4px;
}

.page-about .ab-tagstrip a {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  text-decoration: none;
  padding: 8px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--fg-2);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .ab-tagstrip a:hover,
.page-about .ab-tagstrip a:focus-visible {
  color: var(--ink-0);
  background: var(--cy);
  border-color: var(--cy);
}

/* ---------- 主体布局：左侧章节索引 + 右侧长文 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-idx-w) minmax(0, 1fr);
    gap: 56px;
  }
}

.page-about .ab-index {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .ab-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 16px;
  }
}

.page-about .ab-index__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--fg-2);
  margin: 0 0 14px;
}

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

.page-about .ab-index__list li {
  margin: 0;
}

.page-about .ab-index__list a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 9px 4px 9px 0;
  text-decoration: none;
  font-size: 13.5px;
  color: var(--fg-2);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease);
}

.page-about .ab-index__list i {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11.5px;
  color: #2c3c5a;
  transition: color 0.2s var(--ease);
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  color: var(--cy-soft);
}

.page-about .ab-index__list a:hover i,
.page-about .ab-index__list a:focus-visible i {
  color: var(--cy);
}

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  padding-top: clamp(34px, 5vw, 62px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .ab-body > .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: clamp(14px, 2.4vw, 26px);
  align-items: start;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .ab-chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(44px, 8vw, 86px);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: var(--cy);
  opacity: var(--ab-num-op);
  user-select: none;
}

.page-about .ab-chapter__head .section-title {
  margin: 0;
  line-height: 1.2;
}

.page-about .ab-chapter__head .eyebrow {
  margin: 0 0 10px;
}

.page-about .ab-chapter .prose + .prose,
.page-about .ab-chapter .ab-figure + .prose,
.page-about .ab-chapter .ab-cats + .prose {
  margin-top: clamp(18px, 2.4vw, 26px);
}

/* ---------- 配图 ---------- */
.page-about .ab-figure {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-1);
}

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

.page-about .ab-figure figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-2);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cy) 0%, var(--vi) 55%, rgba(240, 71, 154, 0.45) 100%);
  opacity: 0.6;
}

.page-about .ab-timeline > li {
  position: relative;
  margin-bottom: 12px;
}

.page-about .ab-timeline > li:last-child {
  margin-bottom: 0;
}

.page-about .ab-timeline > li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 20px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--cy);
  background: var(--ink-0);
  box-shadow: 0 0 0 4px rgba(63, 224, 208, 0.08);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .ab-timeline > li:hover::before,
.page-about .ab-timeline > li:focus-within::before {
  background: var(--cy);
  box-shadow: 0 0 0 7px rgba(63, 224, 208, 0.16);
}

.page-about .ab-stage details {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .ab-stage details:hover {
  border-color: rgba(63, 224, 208, 0.34);
}

.page-about .ab-stage details[open] {
  border-color: rgba(63, 224, 208, 0.48);
  background: rgba(20, 32, 52, 0.78);
}

.page-about .ab-stage summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--fg);
  font-size: 15.5px;
}

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

.page-about .ab-stage summary:focus-visible {
  outline: 2px solid var(--cy);
  outline-offset: -3px;
  border-radius: var(--r-md);
}

.page-about .ab-stage__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cy);
  white-space: nowrap;
}

.page-about .ab-stage__title {
  font-weight: 600;
}

.page-about .ab-stage__mark {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
}

.page-about .ab-stage__mark::before,
.page-about .ab-stage__mark::after {
  content: "";
  position: absolute;
  background: var(--fg-2);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .ab-stage__mark::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .ab-stage__mark::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about .ab-stage details[open] .ab-stage__mark::after {
  transform: scaleY(0);
}

.page-about .ab-stage details[open] .ab-stage__mark::before {
  background: var(--cy);
}

.page-about .ab-stage__body {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--fg-2);
}

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

/* ---------- 分类卡片 ---------- */
.page-about .ab-cats {
  list-style: none;
  margin: clamp(20px, 2.8vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

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

@media (min-width: 1180px) {
  .page-about .ab-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .ab-cat {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-1);
  padding: 18px 18px 16px;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease), transform 0.24s var(--ease);
}

.page-about .ab-cat:hover,
.page-about .ab-cat:focus-within {
  border-color: var(--cy);
  background: var(--ink-2);
  transform: translateY(-2px);
}

.page-about .ab-cat h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.page-about .ab-cat p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-2);
  flex: 1 1 auto;
}

.page-about .ab-cat__link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--fg-2);
  opacity: 0.6;
  transition: opacity 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .ab-cat:hover .ab-cat__link,
.page-about .ab-cat:focus-within .ab-cat__link {
  opacity: 1;
  color: var(--cy-soft);
}

.page-about .ab-cat__link:focus-visible {
  outline: 2px solid var(--cy);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 覆盖与终端 ---------- */
.page-about .ab-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .ab-reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

.page-about .ab-reach__visual {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--ink-1);
  padding: 20px;
}

.page-about .ab-dots {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 0 auto;
}

.page-about .ab-terminals {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .ab-terminals li {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--fg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  text-align: center;
  white-space: nowrap;
}

/* ---------- 资质信息表 ---------- */
.page-about .ab-facts {
  margin: clamp(20px, 2.8vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 700px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-facts > div {
  background: var(--ink-1);
  padding: 16px 18px;
}

.page-about .ab-facts dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--fg-2);
  margin-bottom: 7px;
}

.page-about .ab-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg);
  overflow-wrap: anywhere;
}

.page-about .ab-facts dd.ab-facts__wide {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--cy-soft);
}

/* ---------- 章末跳转 ---------- */
.page-about .ab-next {
  margin-top: clamp(38px, 5vw, 66px);
  padding-top: clamp(30px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .ab-next .section-title {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 700px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .ab-next__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  row-gap: 4px;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-1);
  padding: 16px 18px;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .ab-next__item:hover,
.page-about .ab-next__item:focus-visible {
  border-color: var(--cy);
  background: var(--ink-2);
}

.page-about .ab-next__item:focus-visible {
  outline: 2px solid var(--cy);
  outline-offset: 3px;
}

.page-about .ab-next__idx {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cy);
  opacity: 0.75;
  padding-top: 3px;
}

.page-about .ab-next__item b {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--fg);
}

.page-about .ab-next__item > span:last-child {
  font-size: 13px;
  line-height: 1.65;
  color: var(--fg-2);
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}
</｜｜DSML｜｜ parameter>
</invoke>
</｜｜DSML｜｜ parameter>