.page-about {
  background: var(--paper);
  color: var(--near-black);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
  font-family: var(--font-mono);
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: clamp(18px, 3vw, 30px);
  padding: clamp(44px, 8vw, 104px) 0 clamp(52px, 8vw, 112px);
  background: var(--deep);
  color: var(--paper);
}

.page-about .about-hero__slab {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--ink);
  clip-path: polygon(64% 0, 100% 0, 100% 100%, 40% 100%);
}

.page-about .about-hero__slab::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 2px 2px, rgba(0, 229, 195, 0.34) 2px, transparent 0);
  background-size: 26px 26px;
  opacity: 0.55;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0;
  padding: 5px 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  border: 1px solid rgba(224, 169, 59, 0.5);
  border-radius: var(--radius);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 5.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(245, 242, 233, 0.86);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
  max-width: 700px;
}

.page-about .about-hero__stats > li {
  padding-top: 12px;
  border-top: 2px solid var(--gold);
}

.page-about .about-hero__num {
  display: block;
  font-size: clamp(25px, 3.3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--electric);
}

.page-about .about-hero__lab {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(245, 242, 233, 0.68);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(48px, 7vw, 92px) 0;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line-light);
}

.page-about .about-sec--dark {
  background: var(--ink);
  color: var(--paper);
  border-top-color: var(--line-dark);
}

.page-about .about-sec--panel {
  background: var(--paper);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px 18px;
  align-items: start;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(42px, 8vw, 70px);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: var(--gold);
}

.page-about .about-sec--dark .about-sec__num {
  color: var(--gold-light);
}

.page-about .about-sec__headtext .eyebrow {
  margin: 0 0 6px;
}

.page-about .about-sec__headtext .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.28;
  letter-spacing: -0.005em;
}

.page-about .about-sec__head .v-note {
  grid-column: 1 / -1;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--neutral);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  padding: 5px 10px;
}

.page-about .about-sec--dark .about-sec__head .v-note {
  color: rgba(245, 242, 233, 0.6);
  border-color: var(--line-dark);
}

/* ---------- 01 定位 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-split__body p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted-ink);
}

.page-about .about-lead {
  font-size: clamp(16px, 1.8vw, 18px) !important;
  line-height: 1.8 !important;
  color: var(--near-black) !important;
}

.page-about .about-lead--wide {
  max-width: 72ch;
  margin: 0 0 clamp(26px, 4vw, 42px);
}

.page-about .about-taxa {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-taxa > li {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-taxa__text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted-ink);
}

.page-about .about-aside-link {
  margin-top: 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted-ink);
}

.page-about .about-aside-link a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-facts {
  padding: clamp(20px, 3vw, 28px);
  background: var(--deep);
  color: var(--paper);
  border: 2px solid var(--near-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.page-about .about-facts__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--electric);
}

.page-about .about-facts__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-facts__list > li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-dark);
  font-size: 14px;
}

.page-about .about-facts__list > li > span:first-child {
  color: rgba(245, 242, 233, 0.66);
}

.page-about .about-facts__list > li > span:last-child {
  color: var(--gold-light);
  font-weight: 700;
}

.page-about .about-facts__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(245, 242, 233, 0.62);
}

/* ---------- 02 历程 ---------- */
.page-about .about-history__figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
  border: 2px solid rgba(245, 242, 233, 0.4);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
}

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-stage {
  display: grid;
  gap: 8px;
  padding: 20px 0 20px 18px;
  border-top: 1px solid var(--line-dark);
  border-left: 2px solid rgba(0, 229, 195, 0.35);
}

.page-about .about-stage:last-child {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-stage--current {
  border-left-color: var(--gold);
  background: linear-gradient(90deg, rgba(224, 169, 59, 0.1), transparent 70%);
}

.page-about .about-stage__year {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-stage__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-stage__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 242, 233, 0.74);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 clamp(26px, 4vw, 40px);
  border: 2px solid var(--near-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink);
}

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

.page-about .about-team__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-member {
  padding: 22px 20px 24px;
  background: var(--deep);
  color: var(--paper);
  border: 2px solid var(--near-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-member:hover,
.page-about .about-member:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard);
  border-color: var(--electric);
}

.page-about .about-member__count {
  display: block;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--electric);
}

.page-about .about-member__unit {
  margin-left: 4px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(245, 242, 233, 0.6);
}

.page-about .about-member__role {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-member__text {
  margin: 12px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 242, 233, 0.74);
}

.page-about .about-team__foot {
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-light);
  max-width: 72ch;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted-ink);
}

/* ---------- 04 发布机制 ---------- */
.page-about .about-pipeline {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-pipeline__figure {
  margin: 0;
  border: 2px solid var(--near-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink);
}

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

.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-steps > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-steps__idx {
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-steps > li p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted-ink);
}

.page-about .about-versions {
  margin-top: clamp(28px, 4vw, 46px);
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-version {
  flex: 0 0 78%;
  max-width: 330px;
  scroll-snap-align: start;
  padding: 18px 20px 20px;
  background: var(--gold-light);
  color: var(--near-black);
  border: 2px solid var(--near-black);
  border-left-width: 8px;
  border-left-color: var(--teal);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.page-about .about-version--now {
  border-left-color: var(--gold);
}

.page-about .about-version__tag {
  display: block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about .about-version__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-version__text {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: #3A3A32;
}

/* ---------- 05 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 18px;
}

.page-about .about-partner {
  padding: 22px 20px 24px;
  background: var(--paper);
  border: 2px solid var(--near-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-partner:hover,
.page-about .about-partner:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard);
  border-color: var(--electric);
}

.page-about .about-partner--accent {
  background: var(--panel);
  color: var(--paper);
}

.page-about .about-partner__num {
  display: block;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
}

.page-about .about-partner--accent .about-partner__num {
  color: var(--gold-light);
}

.page-about .about-partner__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-partner--accent .about-partner__title {
  border-bottom-color: var(--line-dark);
}

.page-about .about-partner__text {
  margin: 12px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-ink);
}

.page-about .about-partner--accent .about-partner__text {
  color: rgba(245, 242, 233, 0.76);
}

.page-about .about-invite {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(22px, 3vw, 32px);
  display: grid;
  gap: 20px;
  background: var(--deep);
  color: var(--paper);
  border: 2px solid var(--near-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.page-about .about-invite p {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 242, 233, 0.84);
}

.page-about .about-invite .btn {
  justify-self: start;
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  background: var(--panel);
  color: var(--paper);
  border-top: 2px solid var(--near-black);
  padding: clamp(40px, 6vw, 72px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 242, 233, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 640px) {
  .page-about .about-taxa > li {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

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

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-invite {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-sec__head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 16px 34px;
  }

  .page-about .about-sec__head .v-note {
    grid-column: 3;
    justify-self: end;
    border: none;
    border-inline-start: 3px solid var(--gold);
    border-radius: 0;
    padding: 0 0 0 12px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 12px;
    letter-spacing: 0.22em;
    align-self: start;
  }

  .page-about .about-sec--dark .about-sec__head .v-note {
    border-inline-start-color: var(--gold-light);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-facts {
    position: sticky;
    top: 104px;
  }

  .page-about .about-stage {
    grid-template-columns: 116px minmax(0, 200px) minmax(0, 1fr);
    align-items: baseline;
    gap: 8px 30px;
    padding: 22px 0 22px 22px;
  }

  .page-about .about-versions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
    scroll-snap-type: none;
  }

  .page-about .about-version {
    flex: initial;
    max-width: none;
  }
}

@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-member,
  .page-about .about-partner {
    transition: none;
  }

  .page-about .about-member:hover,
  .page-about .about-member:focus-within,
  .page-about .about-partner:hover,
  .page-about .about-partner:focus-within {
    transform: none;
  }
}