.page-about {
  --about-line: 11px;
  --about-pad: clamp(1.4rem, 4vw, 2.2rem);
  background: var(--paper);
  color: var(--ink);
}

.page-about .section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--header-h) + 1.75rem);
  padding-bottom: 0;
  background:
    radial-gradient(90% 70% at 100% 0%, var(--orange-soft) 0%, rgba(255, 227, 209, 0) 62%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper) 58%, var(--orange-soft) 100%);
  overflow: hidden;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 1.6rem;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero__copy .eyebrow {
  margin: 0 0 .7rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7vw, 4.3rem);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  max-width: 15ch;
}

.page-about .about-hero .lede {
  max-width: 34rem;
  color: var(--ink-70);
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.75;
  margin: 0 0 1.6rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* 纸叠层视觉 */
.page-about .about-hero__art {
  position: relative;
  min-height: 250px;
  margin: 0.5rem 0 1rem;
}

.page-about .art-sheet {
  position: absolute;
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
}

.page-about .art-sheet--back {
  top: 26px;
  right: 0;
  bottom: 0;
  left: 26px;
  background: var(--blue);
}

.page-about .art-sheet--mid {
  top: 13px;
  right: 13px;
  bottom: 13px;
  left: 13px;
  background: var(--orange);
}

.page-about .art-sheet--front {
  top: 0;
  right: 26px;
  bottom: 26px;
  left: 0;
  background: var(--paper);
  box-shadow: var(--shadow-hard);
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: .25rem;
}

.page-about .art-sheet__label {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--blue);
}

.page-about .art-sheet__big {
  font-family: var(--font-num);
  font-size: clamp(2.8rem, 12vw, 4.6rem);
  font-weight: 900;
  line-height: .92;
  color: var(--ink);
}

.page-about .art-sheet__note {
  font-size: .82rem;
  font-weight: 700;
  color: var(--ink-70);
  margin-bottom: .6rem;
}

.page-about .art-sheet__bar {
  display: block;
  height: 6px;
  border-radius: 3px;
  background: var(--orange);
  margin-top: .3rem;
}

.page-about .art-sheet__bar--short {
  width: 58%;
  background: var(--mint);
}

/* 主视觉图 */
.page-about .about-figure {
  margin: 2.25rem 0 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
  overflow: hidden;
  background: var(--paper);
  box-shadow: var(--shadow-hard);
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.page-about .about-figure .media__caption {
  padding: .7rem 1rem;
  font-size: .78rem;
  color: var(--ink-70);
  border-top: 2px solid var(--ink);
}

/* 首屏数据 */
.page-about .hero-metrics {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 1.5rem 0 2.25rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem;
  border-top: 2px solid var(--ink);
}

.page-about .hero-metric__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 6vw, 2.5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--blue);
}

.page-about .hero-metric__label {
  display: block;
  margin-top: .3rem;
  font-size: .78rem;
  font-weight: 700;
  color: var(--ink-70);
}

/* ---------- 阶段导航 ---------- */
.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 30;
  background: var(--ink);
  border-block: 2px solid var(--ink);
}

.page-about .about-rail__inner {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding-block: .5rem;
}

.page-about .about-rail__hint {
  flex: 0 0 auto;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--mint);
  display: none;
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  gap: .3rem;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: block;
  white-space: nowrap;
  padding: .38rem .75rem;
  border-radius: 999px;
  border: 1.5px solid transparent;
  color: var(--paper-82);
  font-size: .8rem;
  font-weight: 800;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
}

/* ---------- 时间轴 ---------- */
.page-about .about-story {
  background: var(--paper);
}

.page-about .story-head {
  max-width: 40rem;
  margin-bottom: clamp(2rem, 5vw, 3rem);
}

.page-about .story-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.6vw, 2.5rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: .5rem 0 .8rem;
}

.page-about .story-head__text {
  margin: 0;
  color: var(--ink-70);
  line-height: 1.8;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2.35rem;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--orange), var(--blue));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 2.5rem;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--orange);
  border: 4px solid var(--paper);
  box-shadow: 0 0 0 3px var(--orange);
  z-index: 1;
}

.page-about .tl-item--blue::before {
  background: var(--blue);
  box-shadow: 0 0 0 3px var(--blue);
}

.page-about .tl-item--mint::before {
  background: var(--mint);
  box-shadow: 0 0 0 3px var(--mint);
}

.page-about .tl-stage {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  margin-bottom: .7rem;
}

.page-about .tl-stage__tag {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-about .tl-stage__no {
  font-family: var(--font-num);
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 900;
  line-height: 1;
  color: var(--orange);
}

.page-about .tl-item--blue .tl-stage__no { color: var(--blue); }
.page-about .tl-item--mint .tl-stage__no { color: var(--mint); }

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3.4vw, 1.75rem);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.01em;
  margin: 0 0 .65rem;
}

.page-about .tl-text {
  margin: 0;
  max-width: 40rem;
  color: var(--ink-70);
  line-height: 1.8;
}

.page-about .tl-card {
  margin-top: 1rem;
  max-width: 30rem;
  padding: .9rem 1.1rem;
  background: var(--orange-soft);
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
}

.page-about .tl-card--blue { background: var(--blue-soft); }
.page-about .tl-card--lemon { background: var(--lemon); }
.page-about .tl-card--mint { background: #E4FAF0; }

.page-about .tl-card__label {
  display: flex;
  align-items: center;
  gap: .45rem;
  margin: 0 0 .35rem;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--ink-70);
}

.page-about .tl-card__text {
  margin: 0;
  font-weight: 700;
  line-height: 1.65;
}

/* ---------- 额度清单 ---------- */
.page-about .about-ledger {
  background: var(--blue-soft);
  border-block: 2px solid var(--ink);
}

.page-about .ledger-grid {
  display: grid;
  gap: 2rem;
}

.page-about .ledger-copy__title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: .5rem 0 .9rem;
}

.page-about .ledger-copy__text {
  margin: 0 0 1.2rem;
  max-width: 34rem;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .ledger-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .ledger-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  padding: .95rem 1.05rem;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
  box-shadow: 4px 4px 0 var(--ink);
}

.page-about .ledger-item__no {
  font-family: var(--font-num);
  font-weight: 900;
  font-size: 1.05rem;
  color: var(--orange);
  line-height: 1.4;
}

.page-about .ledger-item__title {
  margin: 0 0 .25rem;
  font-size: 1rem;
  font-weight: 900;
}

.page-about .ledger-item__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.65;
  color: var(--ink-70);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--paper);
}

.page-about .team-grid {
  display: grid;
  gap: 2rem;
}

.page-about .team-copy__title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: .5rem 0 .9rem;
}

.page-about .team-copy__text {
  margin: 0;
  max-width: 34rem;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .team-figure {
  margin: 1.5rem 0 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
  overflow: hidden;
  background: var(--orange-soft);
}

.page-about .team-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  display: block;
}

.page-about .team-figure .media__caption {
  padding: .65rem 1rem;
  font-size: .76rem;
  color: var(--ink-70);
  border-top: 2px solid var(--ink);
  background: var(--paper);
}

.page-about .team-groups {
  display: grid;
  gap: .7rem;
  align-content: start;
}

.page-about .disclosure {
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
  background: var(--paper);
  transition: box-shadow .25s var(--ease);
}

.page-about .disclosure[data-open="true"] {
  box-shadow: inset 5px 0 0 var(--mint);
}

.page-about .disclosure__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .9rem 1.05rem;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 900;
  color: var(--ink);
}

.page-about .disclosure__trigger:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .tg-label {
  display: flex;
  align-items: center;
  gap: .55rem;
}

.page-about .tg-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--ink);
  background: var(--orange);
  flex: 0 0 auto;
}

.page-about .tg-dot--blue { background: var(--blue); }
.page-about .tg-dot--mint { background: var(--mint); }
.page-about .tg-dot--lemon { background: var(--lemon); }

.page-about .disclosure__sign {
  position: relative;
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.page-about .disclosure__sign::before,
.page-about .disclosure__sign::after {
  content: "";
  position: absolute;
  background: var(--blue);
  border-radius: 2px;
}

.page-about .disclosure__sign::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 3px;
}

.page-about .disclosure__sign::after {
  top: 0;
  left: 7px;
  width: 3px;
  height: 16px;
  transition: transform .25s var(--ease), opacity .25s var(--ease);
}

.page-about .disclosure[data-open="true"] .disclosure__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .disclosure__inner {
  padding: 0 1.05rem 1rem;
}

.page-about .disclosure__inner p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink-70);
  border-top: 1px dashed var(--ink-14);
  padding-top: .75rem;
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  background: var(--paper);
}

.page-about .network-head {
  max-width: 42rem;
  margin-bottom: 1.75rem;
}

.page-about .network-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: .5rem 0 .9rem;
}

.page-about .network-head__text {
  margin: 0;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .network-figure {
  margin: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
  overflow: hidden;
  background: var(--blue-soft);
  box-shadow: var(--shadow-hard);
}

.page-about .network-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  display: block;
}

.page-about .network-figure .media__caption {
  padding: .65rem 1rem;
  font-size: .76rem;
  color: var(--ink-70);
  border-top: 2px solid var(--ink);
  background: var(--paper);
}

.page-about .network-facts {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .network-fact {
  border-top: 3px solid var(--ink);
  padding-top: .7rem;
}

.page-about .network-fact__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  font-weight: 900;
  line-height: 1;
  color: var(--blue);
}

.page-about .network-fact__label {
  display: block;
  margin-top: .3rem;
  font-size: .8rem;
  font-weight: 700;
  color: var(--ink-70);
}

/* ---------- 数字区 ---------- */
.page-about .about-trust {
  background: var(--ink);
  color: var(--paper);
}

.page-about .eyebrow--light {
  color: var(--mint);
}

.page-about .trust-head {
  max-width: 38rem;
}

.page-about .trust-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: .5rem 0 0;
  color: var(--paper);
}

.page-about .trust-grid {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .trust-card {
  padding: 1.15rem 1.2rem;
  border: 2px solid var(--paper-16);
  border-radius: var(--radius-s);
  background: rgba(255, 249, 240, .05);
}

.page-about .trust-card--hi {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .trust-card--hi-blue {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--paper);
}

.page-about .trust-card__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 5.5vw, 2.4rem);
  font-weight: 900;
  line-height: 1;
  margin-bottom: .45rem;
}

.page-about .trust-card__label {
  display: block;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--paper-82);
}

.page-about .trust-card--hi .trust-card__label {
  color: rgba(16, 24, 40, .8);
}

.page-about .trust-card--hi-blue .trust-card__label {
  color: var(--paper-82);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--blue);
  color: var(--paper);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.35rem;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.3rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 .7rem;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 34rem;
  line-height: 1.8;
  color: var(--paper-82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-cta .btn--ghost {
  color: var(--paper);
  border-color: var(--paper-55);
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero__art {
    min-height: 210px;
  }

  .page-about .about-figure,
  .page-about .network-figure {
    box-shadow: 5px 5px 0 var(--ink);
  }

  .page-about .ledger-item {
    box-shadow: 3px 3px 0 var(--ink);
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-rail__hint {
    display: block;
  }

  .page-about .hero-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .network-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .ledger-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.12fr .88fr;
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-hero__art {
    min-height: 320px;
    margin: 0;
  }

  .page-about .timeline {
    padding-left: 0;
  }

  .page-about .timeline::before {
    left: 159px;
    top: 14px;
    bottom: 14px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 2.75rem;
    padding-bottom: 3.5rem;
  }

  .page-about .tl-item::before {
    left: 152px;
    top: 12px;
  }

  .page-about .tl-stage {
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    gap: .3rem;
    margin-bottom: 0;
    padding-top: .2rem;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .ledger-item--shift {
    margin-left: 1.75rem;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2.5rem;
  }
}

@media (min-width: 1040px) {
  .page-about .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .trust-card:nth-child(2) {
    margin-top: 1.25rem;
  }

  .page-about .trust-card:nth-child(5) {
    margin-top: 1.25rem;
  }
}