.page-about {
  --about-max: 1240px;
  --about-rail-w: 104px;
  background: var(--ink-green);
  color: var(--cream-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(84px, 12vw, 148px) 0 clamp(36px, 5vw, 60px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(660px, 78vw);
  height: min(660px, 78vw);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(198, 242, 78, 0.15), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -150px;
  bottom: -220px;
  width: 430px;
  height: 430px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-hero .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.8125rem;
  color: var(--rock);
}

.page-about .about-hero .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 12px;
  color: var(--line-strong);
}

.page-about .about-hero .breadcrumb-list a {
  color: var(--steel);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb-list a:hover {
  color: var(--lime);
}

.page-about .breadcrumb-current {
  color: var(--cream);
}

.page-about .about-hero__kicker {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 5.4vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--cream);
  max-width: 20ch;
}

.page-about .about-hero__accent {
  color: var(--lime);
}

.page-about .about-hero__lead {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.15vw, 1.125rem);
  line-height: 1.8;
  color: var(--cream-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(36px, 5vw, 60px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  background: var(--ink-green);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--ice);
}

.page-about .about-stats__label {
  font-size: 0.8125rem;
  color: var(--steel);
}

/* ---------- 骨架轨 ---------- */
.page-about .about-body {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(40px, 6vw, 72px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: none;
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-chapter__head {
  max-width: 62ch;
}

.page-about .about-chapter__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ice);
}

.page-about .about-chapter__kicker .index-num {
  color: var(--lime);
  margin-right: 6px;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 2.6vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-chapter__dek {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-chapter__body {
  margin-top: clamp(24px, 3.5vw, 40px);
  max-width: 74ch;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.1em;
  line-height: 1.8;
  color: var(--cream-soft);
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__body a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-chapter__body a:hover {
  color: var(--lime);
}

.page-about .about-inline-link {
  margin-top: clamp(24px, 3vw, 32px) !important;
  padding-top: 20px;
  border-top: 1px dashed var(--line-strong);
  font-size: 0.9375rem;
  color: var(--steel) !important;
}

/* ---------- 团队条形图 ---------- */
.page-about .squad {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .squad-row {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .squad-row:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .squad-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .squad-row__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--cream);
}

.page-about .squad-row__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .squad-row__track {
  margin-top: 12px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: rgba(245, 242, 233, 0.08);
  overflow: hidden;
}

.page-about .squad-row__fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--ice), var(--lime));
  transition: filter 0.24s ease, opacity 0.24s ease;
  opacity: 0.85;
}

.page-about .squad-row:nth-child(1) .squad-row__fill { width: 39%; }
.page-about .squad-row:nth-child(2) .squad-row__fill { width: 30%; }
.page-about .squad-row:nth-child(3) .squad-row__fill { width: 20%; }
.page-about .squad-row:nth-child(4) .squad-row__fill { width: 11%; }

.page-about .squad-row__note {
  margin: 12px 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--rock);
  transition: color 0.24s ease;
}

.page-about .squad-row:hover .squad-row__fill,
.page-about .squad-row:focus-within .squad-row__fill {
  opacity: 1;
  filter: brightness(1.12);
}

.page-about .squad-row:hover .squad-row__note,
.page-about .squad-row:focus-within .squad-row__note {
  color: var(--cream-soft);
}

/* ---------- 数据流程 ---------- */
.page-about .flow {
  position: relative;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding-left: 22px;
  display: grid;
  gap: 12px;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 18px;
  bottom: 18px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--ice) 0 6px, transparent 6px 13px);
  background-size: 1px 13px;
  background-repeat: repeat-y;
  opacity: 0.55;
}

.page-about .flow-step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--moss-deep);
  overflow: hidden;
  transition: border-color 0.24s ease;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-green);
  border: 1.5px solid var(--ice);
}

.page-about .flow-step[open] {
  border-color: rgba(198, 242, 78, 0.35);
}

.page-about .flow-step[open]::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .flow-step__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
}

.page-about .flow-step__head::-webkit-details-marker {
  display: none;
}

.page-about .flow-step__idx {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--ice);
  flex: none;
}

.page-about .flow-step__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--cream);
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .flow-step__chev {
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 1.75px solid var(--rock);
  border-bottom: 1.75px solid var(--rock);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.24s ease;
}

.page-about .flow-step[open] .flow-step__chev {
  transform: rotate(225deg) translate(-2px, -2px);
  border-color: var(--lime);
}

.page-about .flow-step__body {
  padding: 0 20px 18px;
}

.page-about .flow-step__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cream-soft);
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
}

.page-about .about-split__text p {
  margin: 0 0 1em;
  line-height: 1.8;
  color: var(--cream-soft);
}

.page-about .about-split__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .img-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--moss-deep);
}

.page-about .about-figure .img-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .img-caption {
  margin: 12px 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 版本时间轴 ---------- */
.page-about .milestones {
  list-style: none;
  margin: 0 0 clamp(32px, 4.5vw, 52px);
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .milestone {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-left: 20px;
  border-left: 2px solid rgba(127, 214, 232, 0.35);
  position: relative;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-green);
  border: 2px solid var(--ice);
}

.page-about .milestone:last-child {
  border-left-color: rgba(198, 242, 78, 0.5);
}

.page-about .milestone:last-child::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .milestone__year {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .milestone:last-child .milestone__year {
  color: var(--lime);
}

.page-about .milestone__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .milestone__text {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cream-soft);
}

/* ---------- 内容主线 ---------- */
.page-about .lines {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .line-item {
  background: var(--night-blue);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .line-item__badge {
  display: inline-block;
  margin-bottom: 14px;
}

.page-about .line-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .line-item__text {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cream-soft);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
}

.page-about .partner-cell {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--moss-deep);
}

.page-about .partner-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-cell__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--cream);
}

.page-about .partner-cell__text {
  margin: 12px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .partner-cell--note {
  background: linear-gradient(150deg, rgba(180, 98, 47, 0.22), rgba(23, 48, 42, 0.9) 60%);
  border-color: rgba(180, 98, 47, 0.4);
}

.page-about .partner-cell__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--cream);
}

.page-about .partner-cell--note .btn {
  margin-top: 18px;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(72px, 10vw, 120px);
}

.page-about .about-cta__box {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
  align-items: center;
  padding: clamp(28px, 4.5vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(198, 242, 78, 0.28);
  background: linear-gradient(140deg, rgba(23, 48, 42, 0.95), rgba(16, 28, 46, 0.95));
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-cta__dek {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .partner-cell--note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-split--reverse {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-split--reverse .about-figure {
    order: 1;
  }

  .page-about .milestone {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 20px;
    align-items: start;
    padding-left: 26px;
  }

  .page-about .milestone::before {
    top: 4px;
  }

  .page-about .milestone__title {
    margin-top: 0;
  }

  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1.4fr) auto;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1080px) {
  .page-about .about-track {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(24px, 3.5vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 22px;
    bottom: 22px;
    width: 1px;
    background: linear-gradient(180deg, var(--ice), var(--lime) 68%, var(--warm));
    opacity: 0.32;
  }

  .page-about .about-rail__list a {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--steel);
    text-decoration: none;
    font-variant-numeric: tabular-nums;
    transition: color 0.2s ease;
  }

  .page-about .about-rail__list a::before {
    content: "";
    flex: none;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1.5px solid var(--rock);
    background: var(--ink-green);
    transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    color: var(--cream);
  }

  .page-about .about-rail__list a:hover::before,
  .page-about .about-rail__list a:focus-visible::before {
    border-color: var(--lime);
    background: var(--lime);
    box-shadow: 0 0 0 4px var(--lime-soft);
  }

  .page-about .partner-cell--note {
    grid-column: auto;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .lines {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .squad-row__fill,
  .page-about .squad-row__note,
  .page-about .flow-step,
  .page-about .flow-step__chev,
  .page-about .about-rail__list a,
  .page-about .about-rail__list a::before {
    transition: none;
  }
}
</PAGE_CSS>>>>>