.page-about {
  background: var(--c-navy);
  color: var(--c-text);
  overflow-x: hidden;
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding-block: 1.15rem 0.2rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
}

.page-about .breadcrumb__link {
  color: var(--c-text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--c-signal-hi);
  border-bottom-color: var(--c-signal-hi);
}

.page-about .breadcrumb__sep {
  color: var(--c-line-strong);
}

.page-about .breadcrumb__current {
  color: var(--c-sand);
}

/* ---------- 章标题组 ---------- */
.page-about .chapter-head {
  display: grid;
  gap: 0.35rem;
  margin-bottom: clamp(1.3rem, 3vw, 2.1rem);
}

.page-about .chapter-head__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-signal);
}

.page-about .chapter-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: inherit;
}

.page-about .chapter-head__desc {
  margin: 0.4rem 0 0;
  max-width: 60ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: inherit;
  opacity: 0.78;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(2.6rem, 6vw, 4.8rem);
  background:
    radial-gradient(115% 88% at 88% 2%, rgba(255, 107, 53, 0.2), rgba(255, 107, 53, 0) 58%),
    radial-gradient(90% 72% at 2% 98%, rgba(46, 196, 182, 0.15), rgba(46, 196, 182, 0) 62%),
    linear-gradient(168deg, var(--c-void) 0%, var(--c-navy) 56%, var(--c-navy-2) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(169, 180, 194, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 180, 194, 0.09) 1px, transparent 1px);
  background-size: 86px 86px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
  align-items: start;
  padding-top: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-hero__kicker {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  color: var(--c-mint);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(1rem, 2.4vw, 1.5rem);
  font-family: var(--font-display);
  font-size: var(--fs-display);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--c-paper);
  background: linear-gradient(98deg, var(--c-paper) 38%, var(--c-sand) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero__intro {
  margin: 0 0 clamp(1.2rem, 3vw, 1.8rem);
  max-width: 46ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--c-paper);
  opacity: 0.84;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-hero__dossier {
  position: relative;
  padding: clamp(1.05rem, 2.8vw, 1.6rem);
  border: 1px solid var(--c-line-strong);
  border-radius: var(--radius-l);
  background: linear-gradient(180deg, rgba(19, 43, 77, 0.94), rgba(11, 31, 58, 0.94));
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__dossier::before {
  content: "";
  position: absolute;
  top: -1px;
  left: clamp(1.05rem, 2.8vw, 1.6rem);
  width: 46px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--c-signal);
}

.page-about .about-hero__dossier-title {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

.page-about .dossier-list {
  display: grid;
  gap: 0.85rem 1.2rem;
  margin: 0;
}

.page-about .dossier-item {
  padding-top: 0.6rem;
  border-top: 1px solid var(--c-line);
}

.page-about .dossier-item dt {
  font-size: var(--fs-micro);
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

.page-about .dossier-item dd {
  margin: 0.2rem 0 0;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.page-about .dossier-num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.2vw, 1.85rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-signal);
}

.page-about .dossier-unit {
  font-size: var(--fs-small);
  color: var(--c-sand);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding-block: clamp(2.4rem, 6vw, 4rem) clamp(1.6rem, 4vw, 2.6rem);
  background: var(--c-navy);
}

.page-about .about-origin__body {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-origin__lead {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  line-height: 1.6;
  letter-spacing: -0.01em;
  color: var(--c-sand);
}

.page-about .about-origin__notes {
  display: grid;
  gap: 1rem;
  padding-left: clamp(0.9rem, 2vw, 1.3rem);
  border-left: 1px solid var(--c-line-strong);
}

.page-about .about-origin__note {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--c-text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-arc {
  padding-block: clamp(2rem, 5vw, 3.4rem) clamp(2.6rem, 6vw, 4.4rem);
  background: var(--c-navy);
}

.page-about .arc-banner {
  position: relative;
  margin: 0 0 clamp(1.6rem, 4vw, 2.4rem);
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-navy-2);
}

.page-about .arc-banner img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .arc-banner figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.6rem 1rem 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
  color: var(--c-sand);
  background: linear-gradient(180deg, rgba(7, 19, 34, 0), rgba(7, 19, 34, 0.88));
}

.page-about .arc-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(0.9rem, 2.4vw, 1.1rem);
}

.page-about .arc-list::before {
  content: "";
  position: absolute;
  top: 1.4rem;
  bottom: 1.4rem;
  left: 1.125rem;
  width: 1px;
  background: linear-gradient(180deg, var(--c-line-strong), rgba(169, 180, 194, 0.12));
}

.page-about .arc-step {
  position: relative;
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  column-gap: 0.9rem;
  align-items: start;
}

.page-about .arc-step__index {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  border: 1px solid var(--c-signal);
  background: var(--c-navy);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--c-signal);
}

.page-about .arc-step__body {
  padding: clamp(0.85rem, 2.2vw, 1.15rem) clamp(0.9rem, 2.4vw, 1.25rem);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, var(--c-navy-2), rgba(11, 31, 58, 0.9));
}

.page-about .arc-step__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .arc-step__value {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--c-mint);
}

.page-about .arc-step__more {
  margin-top: 0.55rem;
  border-top: 1px dashed var(--c-line);
  padding-top: 0.5rem;
}

.page-about .arc-step__more > summary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.05em;
  color: var(--c-signal-hi);
}

.page-about .arc-step__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .arc-step__more > summary::before {
  content: "+";
  display: inline-block;
  width: 0.95rem;
  text-align: center;
  color: var(--c-signal);
}

.page-about .arc-step__more[open] > summary::before {
  content: "−";
}

.page-about .arc-step__more > p {
  margin: 0.55rem 0 0;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--c-text-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: clamp(2.6rem, 6vw, 4.5rem);
  background: var(--c-paper);
  color: var(--c-ink);
}

.page-about .about-team .chapter-head__index {
  color: var(--c-mint-deep);
}

.page-about .about-team .chapter-head__desc {
  color: var(--c-ink-soft);
  opacity: 1;
}

.page-about .about-team__layout {
  display: grid;
  gap: clamp(1.3rem, 3vw, 2.2rem);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--c-navy);
  box-shadow: var(--shadow-card);
}

.page-about .about-team__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__figure figcaption {
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.03em;
  color: var(--c-sand);
  background: var(--c-navy);
}

.page-about .about-team__cards {
  display: grid;
  gap: 0.85rem;
}

.page-about .team-card {
  padding: clamp(0.9rem, 2.2vw, 1.2rem);
  border: 1px solid rgba(7, 19, 34, 0.14);
  border-radius: var(--radius-m);
  background: #ffffff;
}

.page-about .team-card__name {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: 1.25;
  color: var(--c-ink);
}

.page-about .team-card__name::before {
  content: "";
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--c-signal);
}

.page-about .team-card__duty {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--c-ink-soft);
}

.page-about .team-card__more {
  margin-top: 0.55rem;
  padding-top: 0.5rem;
  border-top: 1px dashed rgba(7, 19, 34, 0.16);
}

.page-about .team-card__more > summary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.05em;
  color: var(--c-mint-deep);
}

.page-about .team-card__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card__more > summary::before {
  content: "+";
  display: inline-block;
  width: 0.95rem;
  text-align: center;
  color: var(--c-signal);
}

.page-about .team-card__more[open] > summary::before {
  content: "−";
}

.page-about .team-card__more > p {
  margin: 0.5rem 0 0;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--c-ink-soft);
}

/* ---------- 质量流程 ---------- */
.page-about .about-quality {
  padding-block: clamp(2.6rem, 6vw, 4.5rem);
  background: var(--c-sand);
  color: var(--c-ink);
}

.page-about .about-quality .chapter-head__index {
  color: var(--c-mint-deep);
}

.page-about .about-quality .chapter-head__desc {
  color: var(--c-ink-soft);
  opacity: 1;
}

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .flow-step {
  position: relative;
  padding-top: 1rem;
  border-top: 2px solid var(--c-navy);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-navy);
}

.page-about .flow-step__num {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  color: var(--c-mint-deep);
}

.page-about .flow-step__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: 1.28;
  color: var(--c-ink);
}

.page-about .flow-step__text {
  margin: 0 0 0.7rem;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--c-ink-soft);
}

.page-about .about-quality .data-tag {
  background: var(--c-mint-deep);
  color: var(--c-paper);
}

.page-about .quality-cadence {
  margin: clamp(1.4rem, 3.4vw, 2rem) 0 0;
  padding-left: clamp(0.9rem, 2vw, 1.3rem);
  border-left: 3px solid var(--c-signal);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--c-ink-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding-block: clamp(2.6rem, 6vw, 4.5rem);
  background:
    radial-gradient(80% 60% at 92% 6%, rgba(255, 107, 53, 0.14), rgba(255, 107, 53, 0) 60%),
    var(--c-navy);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.4rem);
}

.page-about .about-partners__intro {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.5rem);
  align-content: start;
}

.page-about .about-partners__intro .chapter-head {
  margin-bottom: 0;
}

.page-about .about-partners__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--c-line);
}

.page-about .about-partners__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-partners__figure figcaption {
  padding: 0.7rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.03em;
  color: var(--c-text-dim);
  background: var(--c-navy-2);
}

.page-about .scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.page-about .scene-item {
  padding: 0.85rem 0 0.85rem clamp(0.9rem, 2vw, 1.15rem);
  border-left: 2px solid var(--c-signal);
  border-top: 1px solid var(--c-line);
}

.page-about .scene-item__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: 1.3;
  color: var(--c-paper);
}

.page-about .scene-item__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--c-text-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(2.4rem, 6vw, 4.2rem) clamp(3rem, 7vw, 5rem);
  background: linear-gradient(180deg, var(--c-navy-2), var(--c-void));
}

.page-about .next-grid {
  display: grid;
  gap: 0.85rem;
}

.page-about .next-card {
  position: relative;
  display: grid;
  gap: 0.3rem;
  padding: clamp(1rem, 2.6vw, 1.4rem) clamp(2.8rem, 6vw, 3.4rem) clamp(1rem, 2.6vw, 1.4rem) clamp(1rem, 2.6vw, 1.4rem);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  background: rgba(11, 31, 58, 0.72);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--c-signal);
  background: rgba(27, 58, 99, 0.7);
  transform: translateY(-2px);
}

.page-about .next-card__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  color: var(--c-mint);
}

.page-about .next-card__title {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  line-height: 1.45;
  color: var(--c-paper);
}

.page-about .next-card__arrow {
  position: absolute;
  right: clamp(0.9rem, 2.4vw, 1.3rem);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.15rem;
  color: var(--c-signal);
  transition: transform 0.2s ease;
}

.page-about .next-card:hover .next-card__arrow,
.page-about .next-card:focus-visible .next-card__arrow {
  transform: translate(4px, -50%);
}

/* ---------- 响应式 ---------- */
@media (min-width: 480px) {
  .page-about .dossier-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .about-origin__body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .arc-step {
    grid-template-columns: 2.75rem minmax(0, 1fr);
    column-gap: 1.25rem;
  }

  .page-about .arc-step__index {
    width: 2.75rem;
    height: 2.75rem;
    font-size: var(--fs-small);
  }

  .page-about .arc-list::before {
    left: 1.375rem;
  }
}

@media (min-width: 980px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .next-card__arrow,
  .page-about .breadcrumb__link {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}