.page-about {
  --ba-line: rgba(255, 215, 0, 0.32);
  --ba-navy-soft: rgba(11, 31, 58, 0.06);
  display: block;
}

/* ===== Hero ===== */
.page-about .ba-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 107, 0, 0.18), transparent 42%),
    var(--color-navy);
  color: var(--color-white);
  padding: 28px 0 48px;
}
.page-about .ba-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -55deg,
    transparent 0 12px,
    rgba(255, 255, 255, 0.04) 12px 13px,
    transparent 13px 26px
  );
  pointer-events: none;
}
.page-about .ba-hero .container {
  position: relative;
  z-index: 1;
}
.page-about .ba-hero__stripe {
  position: absolute;
  top: 0;
  right: 0;
  width: 38%;
  height: 10px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-gold));
}
.page-about .breadcrumb {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.page-about .breadcrumb__link,
.page-about .breadcrumb__current {
  color: var(--color-white);
  font-size: 0.84rem;
}
.page-about .breadcrumb__link:hover {
  color: var(--color-gold);
}
.page-about .breadcrumb__sep {
  color: rgba(255, 255, 255, 0.5);
}
.page-about .ba-hero__layout {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-top: 28px;
}
.page-about .ba-hero__eyebrow {
  color: var(--color-orange);
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  margin: 0 0 8px;
}
.page-about .ba-hero__title {
  margin: 8px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 10vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
}
.page-about .ba-hero__title span {
  display: block;
  color: var(--color-gold);
  font-size: 0.55em;
  letter-spacing: 0.04em;
  margin-top: 8px;
}
.page-about .ba-hero__lead {
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
  max-width: 58ch;
}
.page-about .ba-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-about .ba-hero .btn--ghost {
  border: 2px solid rgba(255, 255, 255, 0.85);
  color: var(--color-white);
  background: transparent;
}
.page-about .ba-hero .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: var(--color-gold);
  color: var(--color-gold);
}
.page-about .ba-hero__seal {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto;
  border: 1px solid rgba(255, 215, 0, 0.35);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: radial-gradient(circle, rgba(255, 215, 0, 0.09), transparent 70%);
}
.page-about .ba-hero__ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}
.page-about .ba-hero__ring span {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-white);
}
.page-about .ba-hero__ring i {
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-gold));
  display: block;
}
.page-about .ba-hero__seal-note {
  position: absolute;
  bottom: 32px;
  margin: 0;
  font-size: 0.76rem;
  color: rgba(255, 255, 255, 0.7);
}

/* ===== 品牌故事 ===== */
.page-about .ba-story {
  background: var(--color-white);
  scroll-margin-top: 24px;
}
.page-about .ba-story__grid {
  display: grid;
  gap: 28px;
}
.page-about .ba-story__content h2,
.page-about .ba-journey__head h2,
.page-about .ba-partners__head h2,
.page-about .ba-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  line-height: 1.12;
  margin: 10px 0 14px;
}
.page-about .ba-story__content p,
.page-about .ba-journey__sub,
.page-about .ba-partners__lead {
  color: var(--color-ink);
  line-height: 1.75;
}
.page-about .ba-story__content p + p {
  margin-top: 14px;
}
.page-about .ba-story__aside {
  background: var(--color-light);
  border-radius: var(--radius);
  padding: 26px 22px;
  border: 1px solid var(--color-gray);
}
.page-about .ba-story__aside-title {
  font-size: 1.1rem;
  margin: 0 0 14px;
  color: var(--color-navy);
}
.page-about .ba-story__facts {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ba-story__facts li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(11, 31, 58, 0.08);
}
.page-about .ba-story__facts li:last-child {
  border-bottom: none;
}
.page-about .ba-story__facts strong {
  display: block;
  color: var(--color-navy);
  font-size: 0.94rem;
  margin-bottom: 4px;
}
.page-about .ba-story__facts span {
  color: var(--color-ink);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ===== 发展里程碑 ===== */
.page-about .ba-journey {
  background: var(--color-light);
}
.page-about .ba-journey__head {
  max-width: 640px;
  margin-bottom: 32px;
}
.page-about .ba-journey__sub {
  margin: 0;
}
.page-about .ba-journey__layout {
  display: grid;
  gap: 32px;
}
.page-about .ba-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .ba-timeline__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-orange), var(--color-gold));
  opacity: 0.45;
}
.page-about .ba-timeline__item {
  position: relative;
  padding-left: 48px;
  padding-bottom: 26px;
}
.page-about .ba-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .ba-timeline__node {
  position: absolute;
  left: -1px;
  top: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-navy);
  color: var(--color-gold);
  border: 2px solid var(--color-gold);
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 0.7rem;
  line-height: 1;
  white-space: nowrap;
  text-align: center;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
  cursor: default;
}
.page-about .ba-timeline__node:hover,
.page-about .ba-timeline__item:focus-within .ba-timeline__node {
  transform: scale(1.1);
  background: var(--color-gold);
  color: var(--color-navy);
}
.page-about .ba-timeline__card {
  background: var(--color-white);
  border: 1px solid rgba(11, 31, 58, 0.1);
  border-radius: 18px;
  padding: 18px 18px 16px;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about .ba-timeline__item:hover .ba-timeline__card,
.page-about .ba-timeline__item:focus-within .ba-timeline__card {
  border-color: var(--color-orange);
  transform: translateY(-2px);
}
.page-about .ba-timeline__card h3 {
  margin: 0 0 6px;
  font-size: 1.08rem;
  color: var(--color-navy);
}
.page-about .ba-timeline__card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-ink);
  line-height: 1.65;
}
.page-about .ba-timeline__fold {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.3s ease;
}
.page-about .ba-timeline__item:hover .ba-timeline__fold,
.page-about .ba-timeline__item:focus-within .ba-timeline__fold {
  max-height: 300px;
  opacity: 1;
  margin-top: 10px;
}
.page-about .ba-timeline__fold p {
  padding-top: 10px;
  border-top: 1px dashed rgba(11, 31, 58, 0.14);
  color: var(--color-navy);
  font-size: 0.86rem;
}
.page-about .ba-journey__media {
  margin: 0;
}
.page-about .ba-journey__frame {
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid rgba(11, 31, 58, 0.1);
}
.page-about .ba-journey__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ba-journey__media figcaption {
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--color-ink);
  text-align: center;
  font-family: var(--font-data);
}

/* ===== 规模与认证 ===== */
.page-about .ba-scale {
  background:
    radial-gradient(circle at 80% 15%, rgba(255, 107, 0, 0.15), transparent 33%),
    var(--color-navy);
  color: var(--color-white);
}
.page-about .ba-scale__head {
  margin-bottom: 26px;
}
.page-about .ba-scale__eyebrow {
  color: var(--color-orange);
}
.page-about .ba-scale__lead {
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.7;
  max-width: 60ch;
  margin: 0;
}
.page-about .ba-scale__stats {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about .ba-scale__stat {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 215, 0, 0.22);
  border-radius: 20px;
  padding: 18px 14px;
  text-align: center;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.page-about .ba-scale__stat:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--color-gold);
}
.page-about .ba-scale__num {
  margin: 0;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 2.1rem;
  line-height: 1.2;
  color: var(--color-gold);
  transition: color 0.2s ease;
}
.page-about .ba-scale__stat:hover .ba-scale__num {
  color: var(--color-orange);
}
.page-about .ba-scale__num span {
  font-size: 0.7em;
}
.page-about .ba-scale__label {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.5;
}
.page-about .ba-scale__grid {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}
.page-about .ba-scale__tech {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-navy);
}
.page-about .ba-scale__tech img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
  display: block;
}
.page-about .ba-scale__honor {
  position: relative;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.16), rgba(255, 107, 0, 0.1)), rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 215, 0, 0.4);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
}
.page-about .ba-scale__medal {
  display: inline-grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: var(--color-navy);
  color: var(--color-gold);
  border: 2px solid var(--color-gold);
  margin-bottom: 12px;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}
.page-about .ba-scale__medal:hover {
  transform: rotate(-6deg);
  background: var(--color-gold);
  color: var(--color-navy);
}
.page-about .ba-scale__honor-tag {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--color-orange);
  margin: 0 0 6px;
}
.page-about .ba-scale__honor h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}
.page-about .ba-scale__honor p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.86);
}
.page-about .ba-scale__note {
  border-left: 3px solid var(--color-orange);
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 0 14px 14px 0;
}
.page-about .ba-scale__note p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

/* ===== 合作与生态 ===== */
.page-about .ba-partners {
  background: var(--color-white);
}
.page-about .ba-partners__head {
  max-width: 720px;
  margin-bottom: 26px;
}
.page-about .ba-partners__lead {
  margin: 0;
}
.page-about .ba-partners__map {
  margin: 0 0 24px;
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid rgba(11, 31, 58, 0.12);
}
.page-about .ba-partners__map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ba-partners__panel {
  background: var(--color-light);
  border: 1px solid rgba(11, 31, 58, 0.1);
  border-radius: var(--radius);
  padding: 24px 20px;
}
.page-about .ba-partners__panel h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  color: var(--color-navy);
}
.page-about .ba-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ba-partners__list li {
  display: grid;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(11, 31, 58, 0.1);
}
.page-about .ba-partners__list li:last-child {
  border-bottom: none;
}
.page-about .ba-partners__list strong {
  color: var(--color-navy);
}
.page-about .ba-partners__list span {
  color: var(--color-ink);
  font-size: 0.9rem;
  line-height: 1.65;
}
.page-about .ba-partners__note {
  margin: 18px 0 0;
  padding: 14px 16px 0;
  border-top: 1px dashed rgba(11, 31, 58, 0.18);
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--color-ink);
}

/* ===== CTA ===== */
.page-about .ba-cta {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 107, 0, 0.35), transparent 34%),
    var(--color-navy);
  color: var(--color-white);
  text-align: center;
}
.page-about .ba-cta::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -50px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 32px solid rgba(255, 215, 0, 0.14);
}
.page-about .ba-cta .container {
  position: relative;
  z-index: 1;
}
.page-about .ba-cta__eyebrow {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--color-gold);
  margin: 0;
}
.page-about .ba-cta h2 {
  margin: 10px 0 10px;
}
.page-about .ba-cta__lead {
  max-width: 52ch;
  margin: 0 auto;
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.7;
}
.page-about .ba-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
}
.page-about .ba-cta .btn--ghost {
  border: 2px solid rgba(255, 255, 255, 0.8);
  color: var(--color-white);
  background: transparent;
}
.page-about .ba-cta .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .page-about .ba-hero__seal {
    width: 240px;
    height: 240px;
  }
  .page-about .ba-hero__seal-note {
    bottom: 42px;
  }
  .page-about .ba-hero__ring span {
    font-size: 2.4rem;
  }
  .page-about .ba-story__aside {
    padding: 32px 30px;
  }
  .page-about .ba-scale__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .ba-scale__grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
  .page-about .ba-partners__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 0 28px;
  }
  .page-about .ba-partners__list li:nth-child(odd) {
    border-right: 1px solid rgba(11, 31, 58, 0.1);
    padding-right: 24px;
  }
  .page-about .ba-partners__list li:nth-child(even) {
    padding-left: 24px;
  }
  .page-about .ba-partners__panel {
    padding: 32px 36px;
  }
}

@media (min-width: 1024px) {
  .page-about .ba-hero {
    padding: 40px 0 72px;
  }
  .page-about .ba-hero__layout {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
    padding-top: 40px;
  }
  .page-about .ba-hero__copy {
    max-width: 680px;
  }
  .page-about .ba-story__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: start;
  }
  .page-about .ba-journey__head {
    margin-bottom: 44px;
  }
  .page-about .ba-journey__layout {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 40px;
    align-items: center;
  }
  .page-about .ba-timeline__list::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about .ba-timeline__item {
    width: 50%;
    padding-left: 0;
    padding-bottom: 44px;
  }
  .page-about .ba-timeline__item:nth-child(odd) {
    align-self: flex-start;
    margin-right: 0;
    text-align: right;
    padding-right: 38px;
  }
  .page-about .ba-timeline__item:nth-child(even) {
    align-self: flex-end;
    margin-left: 0;
    text-align: left;
    padding-left: 38px;
  }
  .page-about .ba-timeline__item:nth-child(odd) .ba-timeline__node {
    left: auto;
    right: -20px;
  }
  .page-about .ba-timeline__item:nth-child(even) .ba-timeline__node {
    left: -20px;
  }
  .page-about .ba-timeline__card {
    padding: 22px;
  }
  .page-about .ba-journey__media {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .page-about .ba-scale__head {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 30px;
    align-items: end;
    margin-bottom: 32px;
  }
  .page-about .ba-scale__stats {
    gap: 18px;
  }
  .page-about .ba-scale__grid {
    gap: 20px;
  }
  .page-about .ba-partners__head {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 30px;
    align-items: end;
    margin-bottom: 28px;
  }
  .page-about .ba-partners__map img {
    max-height: 400px;
  }
  .page-about .ba-partners__panel {
    padding: 36px 40px;
  }
}

@media (hover: none) {
  .page-about .ba-timeline__fold,
  .page-about .ba-timeline__item:hover .ba-timeline__fold,
  .page-about .ba-timeline__item:focus-within .ba-timeline__fold {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
  .page-about .ba-timeline__node:hover,
  .page-about .ba-timeline__node {
    transform: none;
  }
}