.page-about {
  --ab-line: rgba(238, 242, 245, .12);
  --ab-line-strong: rgba(238, 242, 245, .26);
  --ab-paper-text: #17110E;
  --ab-paper-dim: rgba(23, 17, 14, .68);
  --ab-radius: 22px;
}

/* ---------- 面包屑 ---------- */
.page-about .oa-breadcrumb {
  padding-top: 12px;
  padding-bottom: 4px;
}
.page-about .oa-breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--dim-2);
}
.page-about .oa-breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--gray);
}
.page-about .oa-breadcrumb a {
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .oa-breadcrumb a:hover,
.page-about .oa-breadcrumb a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}
.page-about .oa-breadcrumb [aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏分屏 ---------- */
.page-about .ab-hero {
  padding-top: 28px;
  position: relative;
}
.page-about .ab-hero__grid {
  display: grid;
  gap: 36px;
}
.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-size: clamp(34px, 8.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -.03em;
  font-weight: 900;
  color: var(--white);
}
.page-about .ab-hero__lead {
  margin-top: 20px;
  max-width: 34em;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.75;
}
.page-about .ab-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .ab-hero__note {
  margin-top: 22px;
  font-size: 12px;
  color: var(--dim-2);
  letter-spacing: .04em;
}

.page-about .ab-hero__visual {
  position: relative;
  padding: 24px 20px 18px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(47, 224, 208, .1), transparent 60%),
    linear-gradient(180deg, #12262B, #0d1a1e);
  border: 1px solid rgba(47, 224, 208, .22);
  overflow: hidden;
}
.page-about .ab-hero__visual::after {
  content: "";
  position: absolute;
  inset: auto -30% -60% auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 58, 46, .3), transparent 68%);
  pointer-events: none;
}
.page-about .ab-hero__visual-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--cyan);
}
.page-about .ab-hero__visual-cap {
  margin: 18px 0 0;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--dim-2);
}

.page-about .ab-bars {
  display: grid;
  gap: 14px;
}
.page-about .ab-bars__row {
  display: grid;
  grid-template-columns: 5.6rem 1fr 2.6rem;
  align-items: center;
  gap: 10px;
}
.page-about .ab-bars__label {
  font-size: 13px;
  color: var(--dim);
  white-space: nowrap;
}
.page-about .ab-bars__track {
  display: block;
  height: 9px;
  border-radius: 999px;
  background: rgba(238, 242, 245, .09);
  overflow: hidden;
}
.page-about .ab-bars__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transform-origin: left center;
  animation: ab-grow .7s var(--ease) both;
}
.page-about .ab-bars__row:nth-child(1) .ab-bars__fill { width: 38%; background: var(--red); animation-delay: .05s; }
.page-about .ab-bars__row:nth-child(2) .ab-bars__fill { width: 26%; background: var(--cyan); animation-delay: .12s; }
.page-about .ab-bars__row:nth-child(3) .ab-bars__fill { width: 19%; background: var(--amber); animation-delay: .19s; }
.page-about .ab-bars__row:nth-child(4) .ab-bars__fill { width: 10%; background: var(--brick); animation-delay: .26s; }
.page-about .ab-bars__row:nth-child(5) .ab-bars__fill { width: 7%; background: var(--gray); animation-delay: .33s; }
.page-about .ab-bars__num {
  font-size: 12.5px;
  color: var(--white);
  text-align: right;
}

@keyframes ab-grow {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* ---------- 通用区块头 ---------- */
.page-about .ab-sechead {
  max-width: 46em;
  margin-bottom: 34px;
}
.page-about .ab-sechead .oa-h2 {
  margin: 10px 0 0;
}
.page-about .ab-sechead .oa-lead {
  margin-top: 16px;
}
.page-about .ab-sechead--split {
  display: grid;
  gap: 18px;
  max-width: none;
}
.page-about .ab-story__lead {
  margin-top: 0;
}

/* ---------- 团队构成 ---------- */
.page-about .ab-team {
  position: relative;
}
.page-about .ab-roles {
  display: grid;
  gap: 14px;
}
.page-about .ab-role {
  position: relative;
  padding: 22px 22px 20px 26px;
  border-radius: var(--ab-radius);
  border: 1px solid var(--ab-line);
  background: linear-gradient(155deg, rgba(238, 242, 245, .04), rgba(238, 242, 245, .01));
  transition: transform .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
}
.page-about .ab-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: 3px;
  background: var(--gray);
  transition: background .24s var(--ease), transform .24s var(--ease);
}
.page-about .ab-role:hover,
.page-about .ab-role:focus-visible {
  transform: translateY(-3px);
  border-color: var(--ab-line-strong);
  background: linear-gradient(155deg, rgba(238, 242, 245, .07), rgba(238, 242, 245, .02));
  outline: none;
}
.page-about .ab-role:focus-visible {
  box-shadow: 0 0 0 2px var(--red);
}
.page-about .ab-role:nth-child(1):hover::before,
.page-about .ab-role:nth-child(1):focus-visible::before { background: var(--red); }
.page-about .ab-role:nth-child(2):hover::before,
.page-about .ab-role:nth-child(2):focus-visible::before { background: var(--brick); }
.page-about .ab-role:nth-child(3):hover::before,
.page-about .ab-role:nth-child(3):focus-visible::before { background: var(--amber); }
.page-about .ab-role:nth-child(4):hover::before,
.page-about .ab-role:nth-child(4):focus-visible::before { background: var(--cyan); }
.page-about .ab-role:nth-child(5):hover::before,
.page-about .ab-role:nth-child(5):focus-visible::before { background: var(--white); }

.page-about .ab-role__num {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--white);
  line-height: 1;
}
.page-about .ab-role__name {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: .01em;
}
.page-about .ab-role__desc {
  margin: 10px 0 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--dim);
}
.page-about .ab-role__tag {
  display: inline-block;
}

/* ---------- 沈阳基地 ---------- */
.page-about .ab-base__grid {
  display: grid;
  gap: 32px;
}
.page-about .ab-base__copy .oa-h2 {
  margin: 10px 0 0;
}
.page-about .ab-base__copy p {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--dim);
}
.page-about .ab-base__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-base__list li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(18, 38, 43, .5);
  border-left: 2px solid var(--brick);
  font-size: 14px;
  line-height: 1.65;
  color: var(--white);
}
.page-about .ab-base__list .oa-mono {
  color: var(--brick);
  font-size: 12.5px;
}

.page-about .ab-base__figure {
  margin: 0;
}
.page-about .ab-base__cap {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim-2);
}

/* ---------- 发展历程 ---------- */
.page-about .ab-story {
  position: relative;
}
.page-about .ab-filter {
  margin-bottom: 30px;
}
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  position: relative;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(209, 83, 31, .7), rgba(209, 83, 31, .05));
  pointer-events: none;
}
.page-about .ab-stage {
  position: relative;
  padding: 24px 22px 22px 52px;
  border-radius: var(--ab-radius);
  background: var(--paper);
  color: var(--ab-paper-text);
  overflow: hidden;
}
.page-about .ab-stage__bar {
  position: absolute;
  left: 14px;
  top: 26px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brick);
  box-shadow: 0 0 0 4px rgba(209, 83, 31, .18);
}
.page-about .ab-stage__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--brick);
}
.page-about .ab-stage__title {
  margin: 10px 0 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ab-paper-text);
}
.page-about .ab-stage p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-paper-dim);
}
.page-about .ab-stage__meta {
  display: inline-block;
  margin-top: 18px;
}
.page-about .ab-stage[hidden] {
  display: none;
}

/* ---------- 工作节奏 ---------- */
.page-about .ab-rhythm__grid {
  display: grid;
  gap: 32px;
}
.page-about .ab-rhythm__copy .oa-h2 {
  margin: 10px 0 0;
}
.page-about .ab-rhythm__copy > p {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--dim);
}
.page-about .ab-cadence {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}
.page-about .ab-cadence__item {
  position: relative;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-line);
  background: linear-gradient(90deg, rgba(255, 180, 60, .07), transparent 70%);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}
.page-about .ab-cadence__item:hover {
  border-color: rgba(255, 180, 60, .45);
  transform: translateX(4px);
}
.page-about .ab-cadence__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
}
.page-about .ab-cadence__name {
  margin: 8px 0 0;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--white);
}
.page-about .ab-cadence__item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--dim);
}
.page-about .ab-rhythm__figure {
  margin: 0;
}
.page-about .ab-rhythm__cap {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim-2);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners__grid {
  display: grid;
  gap: 18px;
}
.page-about .ab-partner {
  padding: 26px 24px;
}
.page-about .ab-partner__num {
  margin: 0;
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1;
  color: var(--brick);
}
.page-about .ab-partner__name {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ab-paper-text);
}
.page-about .ab-partner p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-paper-dim);
}
.page-about .ab-partner__tag {
  display: inline-block;
  margin-top: 18px;
}

/* ---------- 加入与联系 ---------- */
.page-about .ab-join__grid {
  display: grid;
  gap: 32px;
  align-items: start;
}
.page-about .ab-join__copy .oa-h2 {
  margin: 10px 0 0;
}
.page-about .ab-join__copy > p {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--dim);
}
.page-about .ab-join__contact {
  margin-top: 22px !important;
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--cyan) !important;
  word-break: break-word;
}
.page-about .ab-join__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .ab-join__figure {
  margin: 0;
}
.page-about .ab-join__cap {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim-2);
}

/* ---------- 图片响应式基础 ---------- */
.page-about .oa-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 窄屏细节 ---------- */
@media (max-width: 420px) {
  .page-about .ab-bars__row {
    grid-template-columns: 4.6rem 1fr 2.2rem;
    gap: 8px;
  }
  .page-about .ab-bars__label { font-size: 12px; }
  .page-about .ab-role { padding: 20px 18px 18px 22px; }
  .page-about .ab-partner__num { font-size: 34px; }
}

/* ---------- 平板起 ---------- */
@media (min-width: 720px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-roles .ab-role:first-child {
    grid-column: span 2;
  }
  .page-about .ab-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .ab-timeline::before { display: none; }
  .page-about .ab-stage {
    padding: 76px 22px 24px;
  }
  .page-about .ab-stage__bar {
    left: auto;
    right: 22px;
    top: 26px;
    width: 26px;
    height: 3px;
    border-radius: 3px;
    box-shadow: none;
  }
  .page-about .ab-stage__idx { position: absolute; top: 26px; left: 22px; }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero {
    padding-top: 40px;
  }
  .page-about .ab-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    align-items: center;
  }
  .page-about .ab-base__grid {
    grid-template-columns: 6fr 6fr;
    gap: 48px;
    align-items: center;
  }
  .page-about .ab-rhythm__grid {
    grid-template-columns: 8fr 4fr;
    gap: 44px;
    align-items: start;
  }
  .page-about .ab-join__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: center;
  }
  .page-about .ab-sechead--split {
    grid-template-columns: 7fr 4fr;
    gap: 40px;
    align-items: end;
  }
  .page-about .ab-roles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .ab-roles .ab-role:first-child { grid-column: span 2; }
  .page-about .ab-roles .ab-role:nth-child(2) { grid-column: span 2; }
  .page-about .ab-roles .ab-role:nth-child(3) { grid-column: span 2; }
  .page-about .ab-roles .ab-role:nth-child(4) { grid-column: span 3; }
  .page-about .ab-roles .ab-role:nth-child(5) { grid-column: span 3; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bars__fill { animation: none; }
  .page-about .ab-role,
  .page-about .ab-cadence__item { transition: none; }
  .page-about .ab-role:hover,
  .page-about .ab-role:focus-visible { transform: none; }
  .page-about .ab-cadence__item:hover { transform: none; }
}