.page-about {
  --ab-maxw: 1200px;
  --ab-pad: 20px;
  display: block;
  background: var(--ink);
  color: var(--text);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumbs {
  max-width: var(--ab-maxw);
  margin: 0 auto;
  padding: 20px var(--ab-pad) 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 26px var(--ab-pad) 46px;
  background:
    radial-gradient(92% 82% at 88% 6%, rgba(61, 240, 138, .15), transparent 62%),
    radial-gradient(72% 68% at 6% 100%, rgba(53, 214, 196, .1), transparent 60%),
    linear-gradient(180deg, var(--stand), var(--ink));
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 74, 66, .34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 74, 66, .34) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .5;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 82%);
  mask-image: linear-gradient(180deg, #000, transparent 82%);
}

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

.page-about .ab-hero__grid {
  max-width: var(--ab-maxw);
  margin: 0 auto;
  display: grid;
  gap: 30px;
}

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

.page-about .ab-hero__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--hi);
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: clamp(15px, 2.1vw, 18px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__index {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(10, 38, 34, .62);
  padding: 18px 18px 14px;
}

.page-about .ab-hero__indextitle {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .ab-hero__indexlist {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: abidx;
  display: grid;
  gap: 2px;
}

.page-about .ab-hero__indexlist li {
  counter-increment: abidx;
}

.page-about .ab-hero__indexlist a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 8px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  color: var(--text);
  font-size: 14.5px;
  text-decoration: none;
  transition: background .18s ease, border-color .18s ease, color .18s ease;
}

.page-about .ab-hero__indexlist a::before {
  content: "0" counter(abidx);
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(61, 240, 138, .68);
}

.page-about .ab-hero__indexlist a:hover,
.page-about .ab-hero__indexlist a:focus-visible {
  background: rgba(30, 74, 66, .55);
  border-left-color: var(--accent);
  color: var(--hi);
}

.page-about .ab-hero__stats {
  max-width: var(--ab-maxw);
  margin: 40px auto 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-hero__stats .stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px;
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(16, 54, 47, .9), rgba(4, 18, 17, .68));
}

.page-about .ab-hero__stats .stat__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--accent);
}

.page-about .ab-hero__stats .stat__unit {
  font-size: 13px;
  color: var(--muted);
}

.page-about .ab-hero__stats .stat__label {
  flex: 0 0 100%;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  padding: 52px var(--ab-pad);
  border-bottom: 1px solid rgba(30, 74, 66, .55);
}

.page-about .ab-sec__inner {
  max-width: var(--ab-maxw);
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

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

.page-about .ab-sec__vert {
  display: none;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .22em;
  color: rgba(147, 180, 173, .5);
}

.page-about .ab-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 26px;
}

.page-about .chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -.04em;
  color: rgba(61, 240, 138, .45);
  transition: opacity .5s ease;
}

.page-about .ab-sec[data-reveal] .chapter__num {
  opacity: .45;
}

.page-about .ab-sec[data-reveal].is-inview .chapter__num {
  opacity: 1;
}

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

.page-about .chapter__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .ab-head__note {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .media {
  margin: 0 0 32px;
}

.page-about .media__frame {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel);
}

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

.page-about .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  display: grid;
  gap: 24px;
}

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

.page-about .ab-tl__tick {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: rgba(147, 180, 173, .5);
  padding-left: 12px;
  border-left: 2px solid rgba(30, 74, 66, .9);
}

.page-about .ab-tl__tick.is-current {
  color: var(--accent);
  border-left-color: var(--accent);
}

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

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 34px 24px;
  border-left: 1px solid var(--line);
}

.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--data);
  box-shadow: 0 0 0 4px rgba(53, 214, 196, .13);
}

.page-about .ab-tl__item:last-child::before {
  background: var(--warn);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, .17);
}

.page-about .ab-tl__when {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--accent);
}

.page-about .ab-tl__item:last-child .ab-tl__when {
  color: var(--warn);
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.6vw, 21px);
  line-height: 1.35;
  color: var(--hi);
}

.page-about .ab-tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-tl__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 14px 0 0;
  font-size: 13.5px;
  color: var(--text);
}

.page-about .ab-tl__num {
  font-family: var(--font-data);
  font-size: 24px;
  letter-spacing: -.02em;
  color: var(--hi);
}

/* ---------- 覆盖分布 ---------- */
.page-about .ab-cov {
  display: grid;
  gap: 26px;
}

.page-about .ab-cov__map {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--panel), rgba(4, 18, 17, .86));
  padding: 18px;
}

.page-about .ab-map {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 900 / 480;
}

.page-about .ab-dot--hi {
  fill: var(--accent);
  filter: drop-shadow(0 0 6px rgba(61, 240, 138, .6));
}

.page-about .ab-dot--mid {
  fill: var(--data);
  opacity: .72;
}

.page-about .ab-dot--low {
  fill: var(--data);
  opacity: .3;
}

.page-about .ab-map__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .ab-map__legend li {
  display: flex;
  align-items: center;
  gap: 7px;
}

.page-about .ab-legend__dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.page-about .ab-legend__dot--hi {
  background: var(--accent);
}

.page-about .ab-legend__dot--mid {
  background: var(--data);
  opacity: .72;
}

.page-about .ab-legend__dot--low {
  background: var(--data);
  opacity: .3;
}

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

.page-about .ab-cov__side h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--hi);
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.page-about .ab-tags .tag {
  font-size: 13px;
  padding: 6px 11px;
  border-radius: 999px;
}

.page-about .ab-cov__side p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 数据流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-flow__step {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(10, 38, 34, .55);
  padding: 18px 16px;
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .ab-flow__step:hover {
  transform: translateY(-4px);
  border-color: rgba(61, 240, 138, .55);
}

.page-about .ab-flow__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: rgba(61, 240, 138, .72);
}

.page-about .ab-flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--text);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ab-modules {
  background: linear-gradient(135deg, rgba(16, 54, 47, .92), rgba(4, 18, 17, .62));
}

.page-about .ab-modules .panel__body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 24px;
  margin-bottom: 32px;
}

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

.page-about .ab-team__main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-team__facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-team__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(30, 74, 66, .9);
  font-size: 14.5px;
  color: var(--text);
}

.page-about .ab-fact__num {
  font-family: var(--font-data);
  font-size: 20px;
  letter-spacing: -.02em;
  color: var(--accent);
}

.page-about .ab-compose {
  display: grid;
  gap: 20px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .ab-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .ab-bar__label {
  font-size: 14.5px;
  color: var(--text);
}

.page-about .ab-bar__value {
  font-family: var(--font-data);
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--hi);
}

.page-about .ab-bar__duty {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .meter {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(30, 74, 66, .9);
  overflow: hidden;
}

.page-about .meter__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--data), var(--accent));
  transition: width .6s cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 16px;
  margin-bottom: 28px;
}

.page-about .ab-partner {
  padding: 20px 18px;
}

.page-about .ab-partner__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-data);
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--accent);
}

.page-about .ab-partner h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--hi);
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-figure--wide {
  margin-bottom: 26px;
}

.page-about .ab-eco__note {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 安全 ---------- */
.page-about .ab-safety {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-safety li {
  position: relative;
  padding-left: 22px;
}

.page-about .ab-safety li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--accent);
  transform: rotate(45deg);
}

.page-about .ab-safety h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--hi);
}

.page-about .ab-safety p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-safety__link {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-safety__link a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 240, 138, .38);
}

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

/* ---------- 收尾入口 ---------- */
.page-about .ab-cta {
  padding: 54px var(--ab-pad) 72px;
  background: linear-gradient(180deg, var(--ink), var(--stand));
}

.page-about .ab-cta__inner {
  max-width: var(--ab-maxw);
  margin: 0 auto;
}

.page-about .ab-cta h2 {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--hi);
}

.page-about .ab-cta__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-cta__list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(10, 38, 34, .55);
  color: var(--text);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.page-about .ab-cta__list a:hover,
.page-about .ab-cta__list a:focus-visible {
  transform: translateY(-4px);
  border-color: var(--accent);
  background: rgba(16, 54, 47, .85);
}

.page-about .ab-cta__list strong {
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--hi);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 800px) {
  .page-about .ab-safety {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }
}

@media (min-width: 820px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-partners {
    grid-template-columns: minmax(0, 4fr) minmax(0, 5fr) minmax(0, 3fr);
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-pad: 32px;
  }

  .page-about .ab-sec {
    padding: 84px var(--ab-pad);
  }

  .page-about .ab-tl {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .ab-tl__scale {
    display: flex;
    flex-direction: column;
    gap: 26px;
    position: sticky;
    top: 92px;
    align-self: start;
    padding-top: 6px;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-about .ab-compose {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

@media (min-width: 1000px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-cov {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1120px) {
  .page-about .ab-cta__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .ab-sec__inner {
    grid-template-columns: minmax(0, 1fr) 46px;
    gap: 32px;
  }

  .page-about .ab-sec__vert {
    display: block;
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .meter__fill,
  .page-about .ab-cta__list a,
  .page-about .ab-flow__step,
  .page-about .ab-hero__indexlist a {
    transition: none;
  }

  .page-about .ab-cta__list a:hover,
  .page-about .ab-flow__step:hover {
    transform: none;
  }
}