.page-about {
  --ab-gap: clamp(20px, 3.2vw, 40px);
  --ab-wash: rgba(242, 247, 251, .74);
}

/* ---------- 首屏 ---------- */
.page-about .mb-breadcrumb {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-head__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-head__lead .mb-lede {
  margin-top: 18px;
  max-width: 62ch;
}

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

.page-about .ab-head__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ice-300);
  border: 1px solid var(--ice-300);
}

.page-about .ab-head__facts li {
  background: var(--paper);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .ab-head__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink-900);
  letter-spacing: -0.01em;
}

.page-about .ab-head__key {
  font-size: 13px;
  line-height: 1.5;
  color: var(--frost-700);
  letter-spacing: .03em;
}

/* ---------- 使命 ---------- */
.page-about .ab-mission__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .mb-section--ink .mb-eyebrow {
  color: var(--cyan);
}

.page-about .ab-mission__body {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-wash);
  max-width: 56ch;
}

.page-about .ab-mission__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-mission__list li {
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--cyan);
}

.page-about .ab-mission__list h3 {
  margin: 0 0 6px;
  color: var(--paper);
}

.page-about .ab-mission__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-wash);
}

/* ---------- 愿景轨道 ---------- */
.page-about .ab-vision__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-700);
  max-width: 66ch;
}

.page-about .ab-track {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--ice-300);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-track__node {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--ice-300);
  box-shadow: var(--shadow-paper);
  padding: 24px 20px 24px;
  min-width: 0;
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .ab-track__node:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-paper-hover);
}

.page-about .ab-track__node::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 20px;
  width: 12px;
  height: 12px;
  background: var(--cyan);
  border: 2px solid var(--paper);
  transform: rotate(45deg);
}

.page-about .ab-track__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--paper);
  background: var(--ink-900);
  padding: 3px 8px;
  margin-bottom: 14px;
}

.page-about .ab-track__node h3 {
  margin: 0 0 8px;
}

.page-about .ab-track__node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 版本台阶 ---------- */
.page-about .ab-steps__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-700);
  max-width: 62ch;
}

.page-about .ab-steps__list {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-steps__item {
  background: var(--paper);
  border: 1px solid var(--ice-300);
  padding: 20px 18px 22px;
  min-width: 0;
}

.page-about .ab-steps__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--ice-300);
}

.page-about .ab-steps__v {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-900);
}

.page-about .ab-steps__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--frost-700);
}

.page-about .ab-steps__item h3 {
  margin: 0 0 8px;
}

.page-about .ab-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 宽幅视觉带 ---------- */
.page-about .ab-band {
  margin-block: clamp(28px, 4.5vw, 60px);
}

/* ---------- 六道关 ---------- */
.page-about .ab-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

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

.page-about .ab-flow__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-700);
  max-width: 60ch;
}

.page-about .ab-flow__steps {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ice-300);
  border: 1px solid var(--ice-300);
}

.page-about .ab-flow__steps li {
  background: var(--paper);
  padding: 16px 18px 18px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  min-width: 0;
}

.page-about .ab-flow__n {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan-read);
  padding-top: 4px;
}

.page-about .ab-flow__steps h3 {
  margin: 0 0 4px;
}

.page-about .ab-flow__steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 团队面板 ---------- */
.page-about .ab-team__panel {
  padding: clamp(24px, 4vw, 52px);
}

.page-about .ab-team__head {
  max-width: 46ch;
}

.page-about .ab-team__head .mb-h2 {
  color: var(--paper);
}

.page-about .ab-team__metrics {
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .ab-team__note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(169, 196, 214, .28);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-wash);
  max-width: 68ch;
}

/* ---------- 协作生态 ---------- */
.page-about .ab-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-eco__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-700);
  max-width: 58ch;
}

.page-about .ab-eco__list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-eco__list li {
  padding-left: 16px;
  border-left: 2px solid var(--ice-300);
}

.page-about .ab-eco__list h3 {
  margin: 0 0 4px;
}

.page-about .ab-eco__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .ab-eco__box {
  background: var(--ice-100);
  border: 1px solid var(--ice-300);
  box-shadow: var(--shadow-paper);
  padding: 24px 20px;
}

.page-about .ab-eco__box h3 {
  margin: 0;
}

.page-about .ab-eco__facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-eco__facts li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
  padding-left: 2px;
}

.page-about .ab-eco__facts .mb-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan-read);
  margin-right: 6px;
}

.page-about .ab-eco__award {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ice-300);
  font-size: 14px;
  line-height: 1.75;
  color: var(--amber-deep);
}

/* ---------- 行动区 ---------- */
.page-about .ab-cta__box {
  background: var(--ink-900);
  border: 1px solid var(--ink-700);
  padding: clamp(24px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

.page-about .ab-cta__box h2 {
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .ab-cta__box p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-wash);
  max-width: 56ch;
}

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

/* ---------- 图片基础 ---------- */
.page-about .mb-figure__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .mb-figure__frame {
  overflow: hidden;
}

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

  .page-about .ab-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-steps__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-head__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ab-mission__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .mb-actions.ab-cta__actions {
    justify-content: flex-end;
  }
}

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

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

  .page-about .ab-track__node:hover {
    transform: none;
  }
}