.page-about {
  background: var(--ink-950);
  color: var(--paper);
  padding-bottom: clamp(48px, 7vw, 110px);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: calc(var(--header-h) + 20px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

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

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(24px, 4vw, 56px) 0 clamp(32px, 5vw, 72px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.28;
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: var(--gap);
  grid-template-columns: 1fr;
}

.page-about .ab-hero__lead .eyebrow {
  margin: 0;
}

.page-about .ab-hero__lead .h-page {
  margin: 14px 0 0;
  font-size: clamp(29px, 5.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.page-about .ab-hero__lead .lede {
  margin-top: 18px;
  max-width: 62ch;
  color: var(--cyan-soft);
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.75;
}

.page-about .ab-hero__aside {
  display: grid;
  gap: 10px;
}

.page-about .ab-stat {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .ab-stat__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .ab-stat .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .ab-stat__u {
  font-size: 13px;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .ab-hero__strip {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr;
  padding-top: 6px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-hero__chip {
  margin: 0;
  padding: 8px 0;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .ab-hero__chip .mono {
  color: var(--cyan);
  font-weight: 700;
  margin-right: 6px;
}

/* ---------- 正文骨架 ---------- */
.page-about .ab-body {
  position: relative;
  padding-top: clamp(16px, 2vw, 28px);
}

.page-about .rail__sticky {
  position: sticky;
  top: calc(var(--header-h) + 16px);
}

.page-about .ab-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .toc {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 10px;
}

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

.page-about .toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.page-about .toc__link:hover {
  color: var(--paper);
  border-color: var(--line);
}

.page-about .toc__link[aria-current="true"] {
  color: var(--ink-950);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.8;
}

.page-about .ab-rail__notes {
  display: none;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-rail__notes-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange-soft);
  letter-spacing: 0.04em;
}

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

.page-about .ab-gloss dt {
  font-size: 13px;
  font-weight: 700;
  color: var(--paper);
  margin-top: 12px;
}

.page-about .ab-gloss dd {
  margin: 4px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding: clamp(30px, 4.5vw, 60px) 0 0;
  margin-bottom: clamp(30px, 4.5vw, 58px);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .sec-head {
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .sec-head__row {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 2vw, 20px);
}

.page-about .sec-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  flex: 0 0 auto;
}

.page-about .sec-head .h-2 {
  margin: 0;
  font-size: clamp(21px, 3.2vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.8;
  color: var(--paper);
  max-width: 68ch;
}

.page-about .prose a,
.page-about .ab-aside-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
}

.page-about .prose a:hover,
.page-about .ab-aside-note a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .ab-aside-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 01 四行速览 ---------- */
.page-about .ab-answer {
  margin-top: clamp(18px, 2.4vw, 28px);
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--ink-900);
  border: 1px solid var(--line);
}

.page-about .ab-answer__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .ab-answer__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-answer__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .ab-answer__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-answer__n {
  color: var(--orange);
  font-size: 12px;
  flex: 0 0 auto;
}

/* ---------- 02 三条线 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  grid-template-columns: 1fr;
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-team__list {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .ab-process {
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .ab-process > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
}

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

.page-about .ab-process__idx {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--ink-950);
  background: var(--cyan);
}

.page-about .ab-process__title {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-process__hint {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-about .ab-process__hint::after {
  content: "展开";
}

.page-about .ab-process[open] .ab-process__hint::after {
  content: "收起";
}

.page-about .ab-process[open] > summary {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-process__body {
  padding: 14px 16px 16px;
}

.page-about .ab-process__body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-flow li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .ab-flow li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

.page-about .ab-team__fig {
  align-self: start;
}

/* ---------- 03 量级 ---------- */
.page-about .ab-scale {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-scale__hero {
  grid-column: 1 / -1;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--ink-800);
  border-left: 3px solid var(--cyan);
}

.page-about .ab-scale__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .ab-scale__big {
  margin: 0;
  line-height: 1;
}

.page-about .ab-scale__plus {
  font-size: 0.5em;
  color: var(--orange);
  vertical-align: super;
}

.page-about .ab-scale__u {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-scale__sm {
  padding: 14px 16px;
  background: var(--ink-900);
  border: 1px solid var(--line);
}

.page-about .ab-scale__sm .num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-scale__unit {
  font-size: 0.5em;
  margin-left: 3px;
  color: var(--cyan-soft);
}

.page-about .ab-scale__sm-t {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 04 名额 ---------- */
.page-about .ab-users {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-users__card {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
}

.page-about .ab-users__card:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .ab-users__card .h-3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.page-about .ab-users__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 05 合作生态 ---------- */
.page-about .ab-coop {
  display: grid;
  gap: clamp(14px, 2vw, 24px);
  grid-template-columns: 1fr;
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-map {
  position: relative;
  aspect-ratio: 16 / 9;
  min-height: 230px;
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 100% 33.33%,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 25% 100%,
    var(--ink-900);
  border: 1px solid var(--line);
  border-radius: 0;
}

.page-about .ab-map__dot {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
}

.page-about .ab-map__dot--lg {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-dim);
}

.page-about .ab-map__dot--yg {
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--orange-dim);
}

.page-about .ab-map__dot:focus-visible {
  outline: 2px solid var(--paper);
  outline-offset: 4px;
}

.page-about .ab-map__p1 { left: 16%; top: 30%; }
.page-about .ab-map__p2 { left: 33%; top: 62%; }
.page-about .ab-map__p3 { left: 46%; top: 22%; }
.page-about .ab-map__p4 { left: 58%; top: 68%; }
.page-about .ab-map__p5 { left: 71%; top: 38%; }
.page-about .ab-map__p6 { left: 85%; top: 60%; }
.page-about .ab-map__p7 { left: 22%; top: 78%; }
.page-about .ab-map__p8 { left: 40%; top: 45%; }
.page-about .ab-map__p9 { left: 63%; top: 18%; }
.page-about .ab-map__p10 { left: 79%; top: 80%; }

.page-about .ab-map__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translate(-50%, 4px);
  white-space: nowrap;
  padding: 6px 10px;
  font-size: 12px;
  line-height: 1.3;
  background: var(--ink-800);
  color: var(--paper);
  border: 1px solid var(--line);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--speed) ease, transform var(--speed) ease;
  z-index: 3;
}

.page-about .ab-map__dot:hover .ab-map__tip,
.page-about .ab-map__dot:focus-visible .ab-map__tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .ab-coop__legend {
  align-self: start;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .ab-coop__legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--paper);
}

.page-about .ab-map__swatch {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .ab-map__swatch--lg {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-dim);
}

.page-about .ab-map__swatch--yg {
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--orange-dim);
}

.page-about .ab-coop__legend-hint {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-coop__way {
  margin-top: 12px;
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--ink-800);
  border-left: 3px solid var(--cyan);
}

.page-about .ab-coop__way .h-3 {
  margin: 0 0 14px;
  font-size: 18px;
}

.page-about .ab-coop__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-coop__steps li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-coop__steps .mono {
  color: var(--cyan);
  font-size: 12px;
  flex: 0 0 auto;
}

/* ---------- 06 时间线 ---------- */
.page-about .ab-track {
  margin-top: 12px;
}

.page-about .ab-tl {
  flex: 0 0 min(74vw, 300px);
  padding: 18px 16px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  position: relative;
  scroll-snap-align: start;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 16px;
  top: -5px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .ab-tl__year {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ab-tl .h-4 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .ab-tl p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-tl__fig {
  margin-top: clamp(20px, 3vw, 34px);
}

/* ---------- 07 合作入口 ---------- */
.page-about .ab-start {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-start__card {
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--ink-900);
  border: 1px solid var(--line);
}

.page-about .ab-start__card .h-3 {
  margin: 0 0 14px;
  font-size: 18px;
}

.page-about .ab-start__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-start__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-start__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 10px;
  height: 1px;
  background: var(--orange);
}

.page-about .ab-contact {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
}

.page-about .ab-contact__k {
  flex: 0 0 68px;
  color: var(--mist);
  font-size: 13px;
}

.page-about .ab-contact__v {
  color: var(--paper);
  word-break: break-word;
}

.page-about .ab-start__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .ab-city {
  margin-top: clamp(22px, 3vw, 36px);
}

/* ---------- 图片框微调 ---------- */
.page-about .media-frame {
  border-radius: 0;
}

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

.page-about .media-frame__cap {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 24px;
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .ab-scale {
    grid-template-columns: 1.5fr 1fr 1fr;
  }

  .page-about .ab-scale__hero {
    grid-column: 1 / 2;
    grid-row: 1 / 3;
  }

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

  .page-about .ab-coop {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .ab-tl {
    flex: 0 0 300px;
  }
}

@media (min-width: 1024px) {
  .page-about .rail-layout {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(28px, 3.4vw, 56px);
    align-items: start;
  }

  .page-about .rail {
    border-right: 1px solid var(--line-soft);
    padding-right: clamp(14px, 1.6vw, 24px);
  }

  .page-about .toc {
    flex-direction: column;
    gap: 2px;
    border-bottom: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .toc__link {
    width: 100%;
    justify-content: flex-start;
    padding: 7px 10px;
    border-left: 2px solid var(--line-soft);
  }

  .page-about .toc__link[aria-current="true"] {
    background: transparent;
    color: var(--cyan);
    border-color: var(--cyan);
    border-left-color: var(--orange);
  }

  .page-about .ab-rail__notes {
    display: block;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>