.page-about {
  --ab-pad: clamp(20px, 5vw, 64px);
  --ab-rail: 88px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: calc(var(--ab-pad) * 0.5) 0 calc(var(--ab-pad) * 0.8);
}

.page-about .ab-hero__shell {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .ab-hero__crumbs {
  margin-bottom: 2px;
}

.page-about .ab-hero__frame {
  position: relative;
  background:
    radial-gradient(circle at 86% 12%, rgba(0, 240, 200, 0.14), transparent 46%),
    radial-gradient(circle at 8% 92%, rgba(155, 107, 255, 0.12), transparent 42%),
    var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(140, 251, 224, 0.16) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
  opacity: 0.5;
}

.page-about .ab-hero__body {
  position: relative;
  z-index: 1;
  padding: clamp(24px, 5vw, 56px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.page-about .ab-hero__title {
  margin: 0;
  font-size: clamp(30px, 7vw, 76px);
  line-height: 1.02;
  letter-spacing: 0.02em;
  max-width: 18em;
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 34em;
  color: var(--text);
}

.page-about .ab-hero__stats {
  margin: 10px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  border-top: 2px solid var(--line);
  padding-top: 18px;
}

.page-about .ab-hero__stat {
  margin: 0;
  padding: 10px 12px 12px;
  border-left: 2px solid var(--line);
  background: rgba(8, 18, 15, 0.55);
}

.page-about .ab-hero__stat-k {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-hero__stat-v {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .ab-hero__unit {
  font-size: 0.42em;
  margin-left: 4px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

/* ---------- 点阵导线 ---------- */
.page-about .ab-wire {
  position: relative;
  height: 34px;
  margin: 0 auto;
  width: min(var(--shell), calc(100% - var(--ab-pad) * 2));
}

.page-about .ab-wire::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background-image: linear-gradient(90deg, var(--line) 0 6px, transparent 6px 14px);
  background-size: 14px 2px;
  transform: translateY(-50%);
}

.page-about .ab-wire::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 12px rgba(0, 240, 200, 0.7);
}

/* ---------- 章节头 ---------- */
.page-about .ab-sec-head {
  max-width: 42em;
  margin-bottom: 28px;
}

.page-about .ab-sec-head--wide {
  max-width: 48em;
}

.page-about .ab-sec-head__title {
  margin: 8px 0 12px;
  font-family: var(--disp);
  font-size: clamp(26px, 5vw, 48px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .ab-sec-head__lede {
  margin: 0;
  color: var(--muted);
  max-width: 36em;
  line-height: 1.75;
}

/* ---------- 版本时间线 ---------- */
.page-about .ab-ver__figure {
  margin: 0 0 32px;
  border: 2px solid var(--line);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .ab-tl__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .ab-tl__rail {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .ab-tl__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 240, 200, 0.8);
  flex: 0 0 auto;
}

.page-about .ab-tl__dot--now {
  background: var(--orange);
  box-shadow: 0 0 14px rgba(255, 122, 47, 0.9);
}

.page-about .ab-tl__ver {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

.page-about .ab-tl__fold {
  background: var(--panel);
  border: 2px solid var(--line);
  border-left: 3px solid var(--line);
  transition: border-color 240ms ease, background-color 240ms ease;
}

.page-about .ab-tl__fold:hover {
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
}

.page-about .ab-tl__fold[data-open] {
  background: var(--raise);
  border-left-color: var(--cyan);
}

.page-about .ab-tl__fold .fold__head {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  background: transparent;
  border: 0;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.page-about .ab-tl__fold .fold__index {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .ab-tl__label {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .ab-tl__fold .fold__state {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.page-about .ab-tl__fold .fold__sign {
  position: relative;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}

.page-about .ab-tl__fold .fold__sign::before,
.page-about .ab-tl__fold .fold__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 240ms ease, opacity 240ms ease;
}

.page-about .ab-tl__fold .fold__sign::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}

.page-about .ab-tl__fold .fold__sign::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about .ab-tl__fold[data-open] .fold__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-tl__fold .fold__body {
  overflow: hidden;
}

.page-about .ab-tl__fold .fold__inner {
  padding: 0 16px 16px;
}

.page-about .ab-tl__fold .fold__content p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
  max-width: 38em;
}

/* ---------- 每日条目 ---------- */
.page-about .ab-daily__grid {
  align-items: start;
  row-gap: 28px;
}

.page-about .ab-daily__title {
  margin: 8px 0 14px;
  font-family: var(--disp);
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.1;
  color: var(--text);
}

.page-about .ab-daily__text {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .ab-daily__links {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-daily__nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-daily__num-card {
  padding: 18px 16px;
  background: var(--panel);
  border: 2px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}

.page-about .ab-daily__num-card--cyan {
  background: var(--raise);
  border-color: var(--cyan);
  box-shadow: 6px 6px 0 rgba(0, 240, 200, 0.16);
}

.page-about .ab-daily__num-k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .ab-daily__num-v {
  font-family: var(--mono);
  font-size: clamp(28px, 6vw, 46px);
  line-height: 1;
  font-weight: 600;
  color: var(--orange);
  letter-spacing: -0.01em;
}

.page-about .ab-daily__num-card--cyan .ab-daily__num-v {
  color: var(--cyan);
}

.page-about .ab-daily__num-note {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.1em;
}

/* ---------- 数据节点 ---------- */
.page-about .ab-nodes__grid {
  row-gap: 24px;
  align-items: start;
}

.page-about .ab-nodes__figure {
  margin: 0;
  border: 2px solid var(--line);
}

.page-about .ab-nodes__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-nodes__item {
  display: flex;
  gap: 12px;
  padding: 14px;
  background: var(--panel);
  border: 2px solid var(--line);
}

.page-about .ab-nodes__idx {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font-size: 14px;
  color: var(--ink);
  background: var(--cyan);
  font-weight: 700;
}

.page-about .ab-nodes__name {
  margin: 0 0 4px;
  font-size: 15px;
  color: var(--text);
  font-weight: 600;
}

.page-about .ab-nodes__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-partners {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-partners__card {
  padding: 20px 18px;
  background: var(--panel);
  border: 2px solid var(--line);
  border-top: 3px solid var(--violet);
}

.page-about .ab-partners__num {
  font-family: var(--mono);
  font-size: 42px;
  line-height: 1;
  color: var(--cyan);
  display: block;
}

.page-about .ab-partners__title {
  margin: 8px 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

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

/* ---------- 团队 ---------- */
.page-about .ab-team__chart {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-team__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "role count"
    "track track"
    "duty duty";
  gap: 8px 12px;
  align-items: center;
  padding: 14px 16px;
  background: var(--panel);
  border: 2px solid var(--line);
  transition: border-color 220ms ease, background-color 220ms ease;
}

.page-about .ab-team__row:hover {
  border-color: var(--line-strong);
  background: var(--raise);
}

.page-about .ab-team__role {
  grid-area: role;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .ab-team__count {
  grid-area: count;
  font-family: var(--mono);
  font-size: 24px;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .ab-team__track {
  grid-area: track;
  display: block;
  height: 8px;
  background: rgba(44, 76, 65, 0.5);
  position: relative;
  overflow: hidden;
}

.page-about .ab-team__bar {
  display: block;
  height: 100%;
  width: var(--fill, 0%);
  transition: width 320ms ease;
}

.page-about .ab-team__bar--cyan { background: var(--cyan); }
.page-about .ab-team__bar--violet { background: var(--violet); }
.page-about .ab-team__bar--soft { background: var(--cyan-soft); }
.page-about .ab-team__bar--orange { background: var(--orange); }

.page-about .ab-team__duty {
  grid-area: duty;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .ab-team__foot {
  margin: 20px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 云南 ---------- */
.page-about .ab-yunnan__grid {
  row-gap: 24px;
  align-items: center;
}

.page-about .ab-yunnan__title {
  margin: 8px 0 14px;
  font-family: var(--disp);
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.1;
  color: var(--text);
}

.page-about .ab-yunnan__text {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .ab-yunnan__cta {
  margin: 20px 0 0;
}

.page-about .ab-yunnan__figure {
  margin: 0;
  border: 2px solid var(--line);
}

/* ---------- 合作与积累 ---------- */
.page-about .ab-eco__grid {
  row-gap: 22px;
  align-items: start;
}

.page-about .ab-eco__quote {
  margin: 0;
  padding: 22px 20px;
  background: var(--panel);
  border: 2px solid var(--line);
  border-left: 6px solid var(--violet);
}

.page-about .ab-eco__quote p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .ab-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-eco__item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 12px 14px;
  background: var(--panel);
  border: 2px solid var(--line);
}

.page-about .ab-eco__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
  grid-column: 1 / 2;
}

.page-about .ab-eco__v {
  font-family: var(--mono);
  font-size: 20px;
  color: var(--cyan);
  font-weight: 600;
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  align-self: center;
}

.page-about .ab-eco__d {
  grid-column: 1 / 2;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 接下来 ---------- */
.page-about .ab-next__panel {
  padding: clamp(22px, 4vw, 44px);
  background:
    linear-gradient(140deg, rgba(0, 240, 200, 0.08), transparent 55%),
    var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-next__head {
  max-width: 40em;
  margin-bottom: 24px;
}

.page-about .ab-next__title {
  margin: 8px 0 12px;
  font-family: var(--disp);
  font-size: clamp(26px, 5vw, 46px);
  line-height: 1.08;
  color: var(--text);
}

.page-about .ab-next__lede {
  margin: 0;
  color: var(--muted);
  line-height: 1.78;
}

.page-about .ab-next__folds {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-next__folds .fold {
  background: var(--ink);
  border: 2px solid var(--line);
  border-left: 3px solid var(--line);
  transition: border-color 220ms ease;
}

.page-about .ab-next__folds .fold:hover {
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
}

.page-about .ab-next__folds .fold[data-open] {
  background: var(--raise);
  border-left-color: var(--cyan);
}

.page-about .ab-next__folds .fold__head {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  background: transparent;
  border: 0;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.page-about .ab-next__folds .fold__index {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--violet);
  letter-spacing: 0.1em;
}

.page-about .ab-next__folds .fold__label {
  font-size: 15px;
  font-weight: 600;
}

.page-about .ab-next__folds .fold__state {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.page-about .ab-next__folds .fold__sign {
  position: relative;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}

.page-about .ab-next__folds .fold__sign::before,
.page-about .ab-next__folds .fold__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 240ms ease, opacity 240ms ease;
}

.page-about .ab-next__folds .fold__sign::before {
  top: 6px; left: 0; width: 14px; height: 2px;
}

.page-about .ab-next__folds .fold__sign::after {
  top: 0; left: 6px; width: 2px; height: 14px;
}

.page-about .ab-next__folds .fold[data-open] .fold__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-next__folds .fold__body {
  overflow: hidden;
}

.page-about .ab-next__folds .fold__inner {
  padding: 0 16px 16px;
}

.page-about .ab-next__folds .fold__content p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
  max-width: 38em;
}

.page-about .ab-next__cta {
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 2px solid var(--line);
  color: var(--muted);
  line-height: 1.8;
}

.page-about .ab-next__link {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-next__link:hover {
  color: var(--cyan-soft);
}

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

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

  .page-about .ab-tl__item {
    grid-template-columns: var(--ab-rail) 1fr;
    align-items: start;
    gap: 16px;
  }

  .page-about .ab-tl__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-top: 14px;
    position: relative;
  }

  .page-about .ab-tl__rail::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: -14px;
    left: 4px;
    width: 2px;
    background-image: linear-gradient(180deg, var(--line) 0 6px, transparent 6px 14px);
    background-size: 2px 14px;
  }

  .page-about .ab-tl__item:last-child .ab-tl__rail::before {
    bottom: 50%;
  }

  .page-about .ab-tl__dot {
    position: relative;
    z-index: 1;
  }

  .page-about .ab-team__row {
    grid-template-columns: 160px 64px 1fr 1fr;
    grid-template-areas: "role count track duty";
    gap: 16px;
  }

  .page-about .ab-team__duty {
    text-align: right;
  }
}

/* ---------- 响应式：≥1040px ---------- */
@media (min-width: 1040px) {
  .page-about .ab-hero__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-hero__stats {
    margin-top: 14px;
  }

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

  .page-about .ab-nodes__grid {
    align-items: stretch;
  }

  .page-about .ab-yunnan__grid {
    align-items: center;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 420px) {
  .page-about .ab-hero__stat-v {
    font-size: 22px;
  }

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

  .page-about .ab-tl__fold .fold__head,
  .page-about .ab-next__folds .fold__head {
    grid-template-columns: auto 1fr auto;
    grid-template-areas:
      "index label sign"
      "index state sign";
  }

  .page-about .ab-tl__fold .fold__index,
  .page-about .ab-next__folds .fold__index { grid-area: index; }
  .page-about .ab-tl__label,
  .page-about .ab-next__folds .fold__label { grid-area: label; }
  .page-about .ab-tl__fold .fold__state,
  .page-about .ab-next__folds .fold__state { grid-area: state; }
  .page-about .ab-tl__fold .fold__sign,
  .page-about .ab-next__folds .fold__sign { grid-area: sign; }
}
<<<END>>>

.page-about {
  --fill: currentColor;
}