.page-about {
  overflow-x: hidden;
  position: relative;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -18% -12% 34% -12%;
  background:
    radial-gradient(58% 54% at 16% 22%, rgba(34, 224, 214, .16), transparent 72%),
    radial-gradient(46% 46% at 90% 2%, rgba(255, 90, 54, .14), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  padding-top: clamp(22px, 4vw, 40px);
}

.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 5.4vw, 64px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .ab-hl {
  color: var(--cyan);
  position: relative;
}

.page-about .ab-hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .06em;
  height: .12em;
  border-radius: 999px;
  background: var(--flare);
  opacity: .58;
}

.page-about .ab-hero .section-lead {
  margin-top: 18px;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.82;
  color: var(--cyan-soft);
  max-width: 60ch;
}

.page-about .ab-hero__actions {
  margin-top: clamp(22px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__figure,
.page-about .ab-versions__figure,
.page-about .ab-team__figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 0;
  box-shadow: var(--shadow-lift);
}

/* ---------- 规模条 ---------- */
.page-about .ab-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(34px, 5vw, 58px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .ab-scale__cell {
  background: var(--panel-2);
  padding: 18px clamp(16px, 2vw, 24px);
}

.page-about .ab-scale__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .ab-scale__num em {
  font-style: normal;
  color: var(--flare);
}

.page-about .ab-scale__label {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--steel);
}

/* ---------- 叙事主流程 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: clamp(52px, 9vw, 108px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .ab-sect {
  position: relative;
}

.page-about .ab-sect .section-title {
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .ab-sect .section-lead {
  margin-top: 16px;
  max-width: 66ch;
  color: var(--cyan-soft);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.82;
}

.page-about .ab-cols {
  margin-top: 22px;
  max-width: 78ch;
}

.page-about .ab-cols p {
  margin: 0 0 16px;
  line-height: 1.85;
  color: rgba(244, 251, 255, .78);
}

.page-about .ab-note {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .ab-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .ab-note a:hover,
.page-about .ab-note a:focus-visible {
  color: var(--flare);
  border-color: var(--flare);
}

/* ---------- 版本演进 ---------- */
.page-about .ab-versions__tags {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-versions {
  margin-top: clamp(20px, 3vw, 28px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .ab-versions__cards {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 232px), 1fr));
}

.page-about .ab-ver {
  position: relative;
  padding: 22px 20px 20px;
  border-radius: var(--radius-md);
  background: var(--panel-2);
  border: 1px solid var(--line);
  transition: transform .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
}

.page-about .ab-ver:hover {
  transform: translateY(-3px);
  background: var(--panel);
  border-color: var(--line-strong);
}

.page-about .ab-ver__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 11px;
  border-radius: var(--radius-pill);
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--ink);
  background: var(--cyan);
}

.page-about .ab-ver:last-child .ab-ver__tag {
  background: var(--flare);
  color: var(--white);
}

.page-about .ab-ver .card__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-ver p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 251, 255, .74);
}

.page-about .ab-versions__aside {
  display: grid;
  gap: 16px;
}

.page-about .ab-spark {
  margin: 0;
  padding: 18px 18px 12px;
  border-radius: var(--radius-md);
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
}

.page-about .ab-spark svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-spark__cap {
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .ab-team__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

.page-about .ab-role {
  padding: 20px;
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line-soft);
  transition: border-color .3s var(--ease);
}

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

.page-about .ab-role__no {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .ab-role .card__title {
  margin: 0 0 8px;
  font-size: 17.5px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 251, 255, .74);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  margin-top: clamp(24px, 4vw, 36px);
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 258px), 1fr));
}

.page-about .ab-partner {
  position: relative;
  padding: 20px 20px 20px 26px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line-soft);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 3px;
  background: var(--cyan);
  transition: background .3s var(--ease);
}

.page-about .ab-partner:hover {
  border-color: var(--line-strong);
  background: linear-gradient(180deg, var(--panel), rgba(34, 224, 214, .07));
}

.page-about .ab-partner:hover::before {
  background: var(--flare);
}

.page-about .ab-partner .card__title {
  margin: 0 0 8px;
  font-size: 17.5px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 251, 255, .74);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-rhythm {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .ab-rhythm__row {
  display: grid;
  gap: 6px;
  padding: 16px clamp(16px, 2.4vw, 26px);
  background: var(--panel-2);
  transition: background .3s var(--ease);
}

.page-about .ab-rhythm__row:hover {
  background: var(--panel);
}

.page-about .ab-rhythm__label {
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .ab-rhythm__value {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 251, 255, .82);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  padding-bottom: clamp(52px, 8vw, 100px);
}

.page-about .ab-cta__box {
  position: relative;
  padding: clamp(28px, 5vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  background:
    radial-gradient(72% 120% at 102% 0%, rgba(255, 90, 54, .20), transparent 66%),
    linear-gradient(140deg, var(--panel), var(--panel-2));
}

.page-about .ab-cta__box h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 900;
  line-height: 1.14;
  color: var(--white);
  max-width: 20ch;
}

.page-about .ab-cta__box p {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.82;
  color: var(--cyan-soft);
}

.page-about .ab-cta__actions {
  margin-top: clamp(22px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-rhythm__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-cols {
    columns: 2;
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .ab-cols p {
    break-inside: avoid;
  }

  .page-about .ab-sect {
    padding-left: clamp(30px, 4vw, 54px);
  }

  .page-about .ab-sect::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--cyan), rgba(34, 224, 214, 0));
  }
}

@media (min-width: 1000px) {
  .page-about .ab-versions {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
    align-items: start;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-ver:hover {
    transform: none;
  }

  .page-about .ab-ver,
  .page-about .ab-role,
  .page-about .ab-partner,
  .page-about .ab-rhythm__row {
    transition: none;
  }
}