.page-about {
  --about-side: 186px;
  background: var(--bb-surface);
  color: var(--bb-ink);
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  width: min(calc(100% - var(--bb-gutter) * 2), var(--bb-max));
  margin: 0 auto;
  padding-top: 18px;
}
.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--bb-stone);
}
.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(11, 42, 69, .28);
}
.page-about .about-crumbs a {
  color: var(--bb-teal-dark);
  text-decoration: none;
}
.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  width: min(calc(100% - var(--bb-gutter) * 2), var(--bb-max));
  margin: 20px auto 0;
  padding: clamp(32px, 5vw, 66px) clamp(22px, 4.4vw, 58px) clamp(30px, 4.2vw, 54px);
  border-radius: 36px 10px 36px 10px;
  background: linear-gradient(148deg, var(--bb-deep) 0%, var(--bb-deep-2) 52%, #10556b 100%);
  color: var(--bb-cream);
  overflow: hidden;
  isolation: isolate;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  left: -8%;
  top: 24%;
  width: 54%;
  height: 2px;
  background: linear-gradient(90deg, rgba(224, 169, 75, 0), var(--bb-gold), rgba(224, 169, 75, 0));
  transform: rotate(-16deg);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -20%;
  bottom: -54%;
  width: 80%;
  height: 112%;
  border-radius: 50% 40% 46% 52%;
  background: radial-gradient(circle at 42% 42%, rgba(23, 163, 152, .45), rgba(23, 163, 152, 0) 68%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--bb-teal-soft);
  border-bottom: 2px solid rgba(127, 209, 193, .5);
  padding-bottom: 4px;
}
.page-about .about-hero h1 {
  margin: 18px 0 0;
  max-width: 19ch;
  font-size: clamp(32px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.01em;
  color: #fff;
}
.page-about .about-hero .bb-lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: rgba(246, 242, 236, .86);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin-top: clamp(28px, 3.6vw, 44px);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid rgba(127, 209, 193, .34);
}
.page-about .about-stat .bb-num {
  font-family: var(--bb-font-mono);
  font-size: clamp(21px, 2.5vw, 29px);
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--bb-gold-soft);
}
.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(246, 242, 236, .72);
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-layout {
  width: min(calc(100% - var(--bb-gutter) * 2), var(--bb-max));
  margin-inline: auto;
}
.page-about .about-index {
  display: none;
}
.page-about .about-index--ghost {
  display: none;
}
.page-about .about-stream {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-layout {
    display: flex;
    align-items: flex-start;
    gap: clamp(30px, 4vw, 62px);
  }
  .page-about .about-index {
    display: block;
    flex: 0 0 var(--about-side);
    position: sticky;
    top: 104px;
    align-self: flex-start;
    padding-top: clamp(38px, 5vw, 68px);
  }
  .page-about .about-index--ghost {
    display: block;
    padding-top: 0;
  }
  .page-about .about-stream {
    flex: 1 1 auto;
  }
}

.page-about .about-index__label {
  margin: 0 0 14px;
  font-family: var(--bb-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--bb-stone);
}
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 14px;
  margin-left: -2px;
  border-left: 2px solid rgba(11, 42, 69, .12);
  font-size: 14px;
  line-height: 1.4;
  color: var(--bb-stone);
  text-decoration: none;
  transition: color .2s var(--bb-ease), border-color .2s var(--bb-ease);
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--bb-deep);
  border-left-color: var(--bb-gold);
}
.page-about .about-index__list .bb-num {
  font-family: var(--bb-font-mono);
  font-size: 11px;
  color: var(--bb-teal);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(36px, 5vw, 66px);
  border-top: 1px solid rgba(11, 42, 69, .07);
}
.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(30px, 4vw, 52px);
}
.page-about .about-chapter__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--bb-teal-dark);
}
.page-about .about-chapter__kicker .bb-num {
  font-family: var(--bb-font-mono);
  font-size: 12px;
  color: var(--bb-gold);
}
.page-about .about-chapter h2 {
  margin: 0 0 18px;
  font-size: clamp(25px, 3.1vw, 38px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--bb-deep);
}
.page-about .about-chapter p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--bb-ink);
}
.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}
.page-about .about-chapter .bb-figure__caption {
  margin: 10px 0 0;
  max-width: 60ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--bb-stone);
}

.page-about .about-media {
  margin: clamp(24px, 3vw, 36px) 0 0;
  border-radius: var(--bb-radius);
  overflow: hidden;
}

/* ---------- 三条主张 ---------- */
.page-about .about-claims {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 26px;
}
.page-about .about-claim {
  position: relative;
  padding: 24px 22px;
  border-radius: var(--bb-radius);
  background: var(--bb-cream);
  border-bottom: 2px solid transparent;
  transition: transform .26s var(--bb-ease), background-color .26s var(--bb-ease), border-color .26s var(--bb-ease);
}
.page-about .about-claim:hover,
.page-about .about-claim:focus-within {
  transform: translateY(-4px);
  background: #EAF4F0;
  border-bottom-color: var(--bb-gold);
}
.page-about .about-claim__num {
  display: inline-block;
  font-family: var(--bb-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--bb-gold);
}
.page-about .about-claim h3 {
  margin: 10px 0 10px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.005em;
  color: var(--bb-deep);
}
.page-about .about-chapter .about-claim p {
  margin: 0 0 14px;
  max-width: none;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bb-stone);
}
.page-about .about-claim__list {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px dashed rgba(11, 42, 69, .16);
}
.page-about .about-claim__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--bb-teal-dark);
}
.page-about .about-claim__list li + li {
  margin-top: 6px;
}
.page-about .about-claim__list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--bb-teal);
}

@media (min-width: 860px) {
  .page-about .about-claims {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 18px;
  }
  .page-about .about-claim:nth-child(2) {
    margin-top: 26px;
  }
  .page-about .about-claim:nth-child(3) {
    margin-top: 52px;
  }
}

/* ---------- 引述块 ---------- */
.page-about .about-quote {
  position: relative;
  margin: clamp(30px, 4vw, 50px) 0 0;
  padding: clamp(24px, 3vw, 38px) clamp(22px, 3.2vw, 42px);
  border-radius: 40px 12px 40px 12px;
  border-left: 4px solid var(--bb-teal);
  background: linear-gradient(118deg, #E6F2EE 0%, #F6F2EC 72%);
}
.page-about .about-chapter .about-quote p {
  margin: 0 0 18px;
  max-width: 30em;
  font-size: clamp(17px, 2.05vw, 23px);
  font-weight: 700;
  line-height: 1.62;
  color: var(--bb-deep);
}
.page-about .about-quote .copy-btn {
  padding: 8px 18px;
  border: 1px solid var(--bb-teal);
  border-radius: 999px;
  background: transparent;
  color: var(--bb-teal-dark);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color .2s var(--bb-ease), color .2s var(--bb-ease), border-color .2s var(--bb-ease);
}
.page-about .about-quote .copy-btn:hover,
.page-about .about-quote .copy-btn:focus-visible {
  background: var(--bb-teal);
  color: #fff;
}
.page-about .about-quote .copy-btn[data-copied] {
  background: var(--bb-gold);
  border-color: var(--bb-gold);
  color: var(--bb-deep);
}

/* ---------- 改版流程（横向通栏） ---------- */
.page-about .about-flow {
  position: relative;
  margin: clamp(34px, 4.6vw, 62px) 0;
  padding: clamp(30px, 4.4vw, 60px) clamp(22px, 4vw, 54px);
  border-radius: var(--bb-radius-lg);
  background: linear-gradient(160deg, var(--bb-deep) 0%, #0D3A56 100%);
  color: var(--bb-cream);
  overflow: hidden;
}
.page-about .about-flow::before {
  content: "";
  position: absolute;
  right: -14%;
  top: -40%;
  width: 52%;
  height: 190%;
  background: linear-gradient(90deg, rgba(224, 169, 75, 0), rgba(224, 169, 75, .16), rgba(224, 169, 75, 0));
  transform: rotate(18deg);
  pointer-events: none;
}
.page-about .about-flow__kicker {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--bb-teal-soft);
}
.page-about .about-flow__kicker .bb-num {
  font-family: var(--bb-font-mono);
  color: var(--bb-gold);
}
.page-about .about-flow h2 {
  position: relative;
  margin: 14px 0 14px;
  font-size: clamp(25px, 3.1vw, 38px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: #fff;
}
.page-about .about-flow__lede {
  position: relative;
  margin: 0 0 clamp(26px, 3.2vw, 40px);
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 242, 236, .78);
}
.page-about .about-flow__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 3.4vw, 46px);
}
@media (min-width: 820px) {
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: start;
  }
}
.page-about .about-flow__figure {
  border-radius: var(--bb-radius);
  overflow: hidden;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .about-step {
  position: relative;
  display: flex;
  gap: 16px;
  padding-bottom: 26px;
  transition: transform .24s var(--bb-ease);
}
.page-about .about-step:last-child {
  padding-bottom: 0;
}
.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 36px;
  bottom: 2px;
  width: 1px;
  background: linear-gradient(180deg, rgba(23, 163, 152, .6), rgba(23, 163, 152, .1));
}
.page-about .about-step:last-child::before {
  display: none;
}
.page-about .about-step__num {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(23, 163, 152, .55);
  background: rgba(23, 163, 152, .14);
  color: var(--bb-teal-soft);
  font-family: var(--bb-font-mono);
  font-size: 12px;
  font-weight: 600;
  transition: background-color .24s var(--bb-ease), border-color .24s var(--bb-ease), color .24s var(--bb-ease);
}
.page-about .about-step__body {
  min-width: 0;
  padding-top: 3px;
}
.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.005em;
  color: var(--bb-cream);
}
.page-about .about-step__note {
  margin: 0;
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(246, 242, 236, .72);
  transition: color .24s var(--bb-ease), max-height .34s var(--bb-ease), opacity .34s var(--bb-ease);
}
.page-about .about-step:hover .about-step__num,
.page-about .about-step:focus-within .about-step__num {
  background: var(--bb-gold);
  border-color: var(--bb-gold);
  color: var(--bb-deep);
}
.page-about .about-step:hover .about-step__note,
.page-about .about-step:focus-within .about-step__note {
  color: rgba(246, 242, 236, .95);
}

@media (min-width: 960px) and (hover: hover) {
  .page-about .about-step:hover {
    transform: translateX(4px);
  }
  .page-about .about-step__note {
    max-height: 2.68em;
    overflow: hidden;
  }
  .page-about .about-step:hover .about-step__note,
  .page-about .about-step:focus-within .about-step__note {
    max-height: 8em;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
}
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}
.page-about .about-team__col {
  padding: 24px 22px 22px;
  border-radius: var(--bb-radius);
  background: var(--bb-cream);
  border-top: 3px solid var(--bb-teal);
}
.page-about .about-team__col--tech {
  background: #EFEDE4;
  border-top-color: var(--bb-clay);
}
.page-about .about-team__col h3 {
  margin: 0 0 14px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.005em;
  color: var(--bb-deep);
}
.page-about .about-team__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .about-team__col li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--bb-stone);
}
.page-about .about-team__col li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: 1px 3px 1px 3px;
  background: var(--bb-teal);
  transform: rotate(45deg);
}
.page-about .about-team__col--tech li::before {
  background: var(--bb-clay);
}

/* ---------- 协作伙伴 ---------- */
.page-about .about-partners {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid rgba(11, 42, 69, .12);
}
.page-about .about-partners__item {
  padding: 22px 0;
  border-bottom: 1px solid rgba(11, 42, 69, .12);
}
.page-about .about-partners dt {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.005em;
  color: var(--bb-deep);
}
.page-about .about-partners dd {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bb-stone);
}
@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partners__item {
    padding: 26px 26px 26px 0;
    border-right: 1px solid rgba(11, 42, 69, .12);
  }
  .page-about .about-partners__item + .about-partners__item {
    padding-left: 26px;
  }
  .page-about .about-partners__item:last-child {
    padding-right: 0;
    border-right: 0;
  }
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  position: relative;
  width: min(calc(100% - var(--bb-gutter) * 2), var(--bb-max));
  margin: 0 auto clamp(48px, 6vw, 86px);
  padding: clamp(30px, 4.2vw, 56px) clamp(22px, 4vw, 56px);
  border-radius: var(--bb-radius-lg);
  background: linear-gradient(128deg, var(--bb-deep) 0%, #10405F 100%);
  color: var(--bb-cream);
  overflow: hidden;
}
.page-about .about-next::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -40%;
  width: 48%;
  height: 200%;
  background: linear-gradient(90deg, rgba(224, 169, 75, 0), rgba(224, 169, 75, .22), rgba(224, 169, 75, 0));
  transform: rotate(18deg);
  pointer-events: none;
}
.page-about .about-next .bb-callout__title {
  position: relative;
  margin: 0 0 12px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: #fff;
}
.page-about .about-next .bb-callout__text {
  position: relative;
  margin: 0 0 24px;
  max-width: 32em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(246, 242, 236, .8);
}
.page-about .about-next .bb-callout__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.page-about .about-next .action-link {
  color: var(--bb-teal-soft);
  font-size: 14px;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.page-about .about-next .action-link:hover,
.page-about .about-next .action-link:focus-visible {
  color: var(--bb-gold-soft);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-claim,
  .page-about .about-step,
  .page-about .about-quote .copy-btn,
  .page-about .about-index__list a {
    transition-duration: .01ms;
  }
  .page-about .about-claim:hover,
  .page-about .about-claim:focus-within,
  .page-about .about-step:hover {
    transform: none;
  }
  .page-about .about-step__note {
    max-height: none;
  }
}