.page-about {
  --about-rail: 148px;
  --about-hair: var(--bb-line);
  --about-glass-line: rgba(255, 255, 255, 0.1);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(1.2rem, 3vw, 2rem);
  margin-bottom: clamp(1rem, 2.5vw, 1.6rem);
}
.page-about .about-crumb .bb-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--bb-steel);
}
.page-about .about-crumb .bb-breadcrumb__item + .bb-breadcrumb__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--about-hair);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(2.2rem, 5vw, 3.4rem);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--bb-lime), rgba(183, 245, 66, 0) 55%);
  opacity: 0.55;
}
.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1.1rem;
}
.page-about .about-hero__meta {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--bb-steel);
  text-transform: uppercase;
}
.page-about .about-hero__title {
  font-family: var(--bb-serif);
  font-weight: 900;
  font-size: clamp(1.9rem, 6.2vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--bb-paper);
  margin: 0 0 1.15rem;
  max-width: 17em;
}
.page-about .about-hero__intro {
  font-size: 16px;
  line-height: 1.72;
  color: var(--bb-steel);
  margin: 0 0 1.6rem;
  max-width: 46em;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(2rem, 5vw, 4.2rem);
    align-items: end;
  }
}

/* ---------- 首屏数据块 ---------- */
.page-about .about-hero__stats {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--bb-radius);
  overflow: hidden;
}
@media (min-width: 900px) {
  .page-about .about-hero__stats { margin-top: 0; }
}
.page-about .about-hero__stat {
  background: var(--bb-carbon);
  padding: 0.95rem 1rem 1.05rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.page-about .about-hero__statnum {
  font-family: var(--bb-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 3.4vw, 1.65rem);
  line-height: 1.05;
  color: var(--bb-lime);
  font-variant-numeric: tabular-nums;
}
.page-about .about-hero__statnum em {
  font-style: normal;
  font-size: 0.62em;
  margin-left: 0.12em;
  color: var(--bb-steel);
}
.page-about .about-hero__statlabel {
  font-size: 12.5px;
  color: var(--bb-steel);
  letter-spacing: 0.02em;
}

/* ---------- 正文双栏骨架 ---------- */
.page-about .about-body {
  padding-top: clamp(2.4rem, 5vw, 3.6rem);
}
.page-about .about-flow {
  min-width: 0;
}
.page-about .about-rail { display: none; }

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }
  .page-about .about-rail { display: block; }
  .page-about .about-rail__list {
    position: sticky;
    top: 7rem;
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.7rem;
  }
  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.15rem 0 0.15rem 0.75rem;
    border-left: 1px solid var(--about-hair);
    text-decoration: none;
    color: var(--bb-steel);
    font-size: 12.5px;
    line-height: 1.4;
    transition: color var(--bb-dur) ease, border-color var(--bb-dur) ease;
  }
  .page-about .about-rail__num {
    font-family: var(--bb-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--bb-steel);
    opacity: 0.75;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--bb-lime);
    border-left-color: var(--bb-lime);
    outline: none;
  }
  .page-about .about-rail__link:hover .about-rail__num,
  .page-about .about-rail__link:focus-visible .about-rail__num {
    color: var(--bb-lime);
    opacity: 1;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 6.5rem;
  padding-bottom: clamp(3rem, 7vw, 5.2rem);
  position: relative;
}
.page-about .about-sec + .about-sec {
  border-top: 1px solid rgba(124, 147, 168, 0.14);
  padding-top: clamp(2.4rem, 5vw, 3.6rem);
}
.page-about .about-sec__head {
  max-width: 44em;
  margin-bottom: clamp(1.6rem, 3.5vw, 2.4rem);
}
.page-about .about-sec__num {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--bb-lime);
  margin-bottom: 0.65rem;
}
.page-about .about-sec__title {
  font-family: var(--bb-serif);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.2vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--bb-paper);
  margin: 0 0 0.7rem;
}
.page-about .about-sec__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--bb-steel);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}
@media (min-width: 860px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}
.page-about .about-origin__text p {
  margin: 0 0 1.05rem;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bb-paper);
}
.page-about .about-quote {
  margin: 1.6rem 0;
  padding: 1.1rem 1.2rem 1.2rem;
  background: var(--bb-glass);
  border-left: 2px solid var(--bb-lime);
  border-radius: 0 var(--bb-radius-sm) var(--bb-radius-sm) 0;
  backdrop-filter: blur(6px);
}
.page-about .about-quote p {
  margin: 0 0 0.45rem;
  font-family: var(--bb-serif);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.35rem);
  color: var(--bb-paper);
  letter-spacing: 0.01em;
}
.page-about .about-quote cite {
  display: block;
  font-style: normal;
  font-size: 13px;
  line-height: 1.6;
  color: var(--bb-steel);
}
.page-about .about-scenes {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.page-about .about-scenes li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 14px;
  line-height: 1.65;
  color: var(--bb-steel);
}
.page-about .about-scenes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 2px;
  background: var(--bb-lime);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  position: relative;
  border-radius: var(--bb-radius);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: linear-gradient(150deg, #171D22 0%, #0A0D0F 60%, rgba(255, 90, 43, 0.16) 100%);
}
.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}
.page-about .about-figure--wide .about-figure__img { aspect-ratio: 14 / 9; }
.page-about .about-figure--bleed .about-figure__img { aspect-ratio: 16 / 10; }
.page-about .about-figure__cap {
  padding: 0.7rem 0.9rem 0.8rem;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--bb-steel);
  background: var(--bb-carbon);
  border-top: 1px solid var(--about-hair);
}
.page-about .about-figure--wide { margin-top: clamp(1.6rem, 3.5vw, 2.4rem); }

/* ---------- 团队角色比例条 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}
@media (min-width: 760px) {
  .page-about .about-roles { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.3rem 2rem; }
}
.page-about .about-role {
  background: var(--bb-carbon);
  border: 1px solid var(--about-hair);
  border-radius: var(--bb-radius-sm);
  padding: 1rem 1.05rem 1.1rem;
}
.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.7rem;
}
.page-about .about-role__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--bb-paper);
  letter-spacing: 0.01em;
}
.page-about .about-role__count {
  font-size: 13px;
  color: var(--bb-steel);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.page-about .about-role__track {
  height: 6px;
  border-radius: 3px;
  background: rgba(124, 147, 168, 0.16);
  overflow: hidden;
  margin-bottom: 0.8rem;
}
.page-about .about-role__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  min-width: 6px;
}
.page-about .about-role__fill--lime { background: var(--bb-lime); }
.page-about .about-role__fill--cyan { background: var(--bb-cyan); }
.page-about .about-role__fill--melt { background: var(--bb-melt); }
.page-about .about-role__fill--amber { background: var(--bb-amber); }
.page-about .about-role__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--bb-steel);
}

/* ---------- 数据链路 ---------- */
.page-about .about-chain {
  display: grid;
  gap: 1.1rem;
}
@media (min-width: 900px) {
  .page-about .about-chain {
    grid-template-columns: minmax(0, 1.15fr) 54px minmax(0, 1fr);
    align-items: center;
    gap: 1rem;
  }
}
.page-about .about-chain__sources {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}
.page-about .about-chain__src {
  background: var(--bb-carbon);
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--bb-cyan);
  border-radius: var(--bb-radius-sm);
  padding: 0.85rem 1rem 0.95rem;
}
.page-about .about-chain__src:nth-child(2) { border-left-color: var(--bb-lime); }
.page-about .about-chain__src:nth-child(3) { border-left-color: var(--bb-score); }
.page-about .about-chain__badge {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--bb-steel);
  margin-bottom: 0.3rem;
}
.page-about .about-chain__name {
  margin: 0 0 0.35rem;
  font-size: 15px;
  font-weight: 700;
  color: var(--bb-paper);
  letter-spacing: 0.01em;
}
.page-about .about-chain__src p,
.page-about .about-chain__target p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--bb-steel);
}
.page-about .about-chain__flow {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 34px;
}
.page-about .about-chain__flow span {
  position: relative;
  display: block;
  width: 2px;
  height: 100%;
  border-radius: 2px;
  background: var(--bb-melt);
}
.page-about .about-chain__flow span::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid var(--bb-score);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
}
@media (min-width: 900px) {
  .page-about .about-chain__flow { height: auto; }
  .page-about .about-chain__flow span { width: 100%; height: 2px; }
  .page-about .about-chain__flow span::after {
    left: auto;
    right: -1px;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 8px solid var(--bb-score);
    border-right: 0;
  }
}
.page-about .about-chain__target {
  background: var(--bb-glass);
  border: 1px solid var(--bb-glass-2);
  border-radius: var(--bb-radius);
  padding: 1.05rem 1.1rem 1.15rem;
  backdrop-filter: blur(8px);
}
.page-about .about-chain__target .bb-tag { margin-bottom: 0.6rem; }

.page-about .about-note {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.75rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
  padding: 1rem 1.1rem 1.05rem;
  border: 1px dashed rgba(255, 194, 77, 0.45);
  border-radius: var(--bb-radius-sm);
  background: rgba(255, 194, 77, 0.05);
}
.page-about .about-note p {
  margin: 0;
  flex: 1 1 18rem;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bb-steel);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-tl {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 0.9rem;
  position: relative;
  padding-bottom: 1.7rem;
}
@media (min-width: 700px) {
  .page-about .about-tl { grid-template-columns: 76px minmax(0, 1fr); gap: 1.4rem; }
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 27px;
  top: 2.2rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(124, 147, 168, 0.5), rgba(124, 147, 168, 0.08));
}
@media (min-width: 700px) {
  .page-about .about-tl::before { left: 37px; }
}
.page-about .about-tl:last-child { padding-bottom: 0; }
.page-about .about-tl:last-child::before { display: none; }
.page-about .about-tl__season {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 26px;
  border-radius: 13px;
  background: var(--bb-carbon);
  border: 1px solid var(--about-hair);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--bb-steel);
  font-variant-numeric: tabular-nums;
}
@media (min-width: 700px) {
  .page-about .about-tl__season { width: 74px; }
}
.page-about .about-tl__body {
  padding-top: 0.05rem;
  min-width: 0;
}
.page-about .about-tl__title {
  margin: 0 0 0.35rem;
  font-size: 16px;
  font-weight: 700;
  color: var(--bb-paper);
  letter-spacing: 0.01em;
}
.page-about .about-tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bb-steel);
  max-width: 52em;
}

/* ---------- 城市合作 ---------- */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: clamp(1.3rem, 3vw, 1.9rem);
}
.page-about .about-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.42rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--about-hair);
  background: var(--bb-carbon);
  color: var(--bb-steel);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--bb-dur) ease, border-color var(--bb-dur) ease, background var(--bb-dur) ease;
}
.page-about .about-chip:hover,
.page-about .about-chip:focus-visible {
  color: var(--bb-void);
  background: var(--bb-lime);
  border-color: var(--bb-lime);
  outline: none;
}
.page-about .about-cities {
  display: grid;
  gap: 1rem;
}
@media (min-width: 760px) {
  .page-about .about-cities { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.page-about .about-city {
  scroll-margin-top: 7rem;
  background: var(--bb-carbon);
  border: 1px solid var(--about-hair);
  border-radius: var(--bb-radius-sm);
  padding: 1.05rem 1.1rem 1.15rem;
}
.page-about .about-city__name {
  margin: 0 0 0.4rem;
  font-family: var(--bb-serif);
  font-weight: 800;
  font-size: 17px;
  color: var(--bb-paper);
  letter-spacing: 0.01em;
}
.page-about .about-city__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bb-steel);
}
.page-about .about-partner-value {
  position: relative;
  margin-top: clamp(1.6rem, 3.5vw, 2.4rem);
  border-radius: var(--bb-radius);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}
.page-about .about-partner-value__panel {
  position: relative;
  margin-top: -3.5rem;
  padding: 1.2rem 1.1rem 1.3rem;
  background: rgba(18, 23, 27, 0.88);
  border-top: 1px solid var(--bb-glass-2);
  backdrop-filter: blur(10px);
}
@media (min-width: 900px) {
  .page-about .about-partner-value__panel {
    margin-top: -5rem;
    padding: 1.4rem clamp(1.4rem, 3vw, 2.2rem) 1.6rem;
  }
}
.page-about .about-partner-value__title {
  margin: 0 0 0.7rem;
  font-family: var(--bb-serif);
  font-weight: 800;
  font-size: 18px;
  color: var(--bb-paper);
}
.page-about .about-partner-value__list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}
@media (min-width: 760px) {
  .page-about .about-partner-value__list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem 1.6rem; }
}
.page-about .about-partner-value__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 14px;
  line-height: 1.65;
  color: var(--bb-steel);
}
.page-about .about-partner-value__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bb-lime);
  opacity: 0.85;
}

/* ---------- 下一步 ---------- */
.page-about .about-sec--tail {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-next {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}
@media (min-width: 940px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}
.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.2rem;
}
.page-about .about-next__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 0.9rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(124, 147, 168, 0.16);
}
.page-about .about-next__item:last-child { border-bottom: 0; padding-bottom: 0; }
.page-about .about-next__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--bb-score);
  padding-top: 0.28rem;
}
.page-about .about-next__title {
  margin: 0 0 0.35rem;
  font-size: 16px;
  font-weight: 700;
  color: var(--bb-paper);
}
.page-about .about-next__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bb-steel);
}
.page-about .about-cta {
  background: var(--bb-carbon);
  border: 1px solid var(--about-hair);
  border-top: 2px solid var(--bb-lime);
  border-radius: var(--bb-radius);
  padding: 1.25rem 1.2rem 1.35rem;
}
.page-about .about-cta__title {
  margin: 0 0 0.6rem;
  font-family: var(--bb-serif);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  color: var(--bb-paper);
}
.page-about .about-cta p {
  margin: 0 0 1.1rem;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bb-steel);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.1rem;
}
.page-about .about-cta__mini {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  border-top: 1px solid rgba(124, 147, 168, 0.16);
  padding-top: 0.9rem;
}
.page-about .about-cta__mini li {
  font-size: 13.5px;
  line-height: 1.6;
}

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--bb-dur) ease, transform var(--bb-dur) ease;
  transition-delay: var(--bb-delay, 0ms);
}
.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .about-rail__link,
  .page-about .about-chip {
    transition: none;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__stats { grid-template-columns: minmax(0, 1fr); }
  .page-about .about-tl { grid-template-columns: 50px minmax(0, 1fr); gap: 0.7rem; }
  .page-about .about-tl__season { width: 48px; font-size: 11px; }
  .page-about .about-tl::before { left: 24px; }
  .page-about .about-next__item { grid-template-columns: 34px minmax(0, 1fr); gap: 0.6rem; }
}
<<<END>>>

.page-about {
  --bb-delay: 0.3s;
}