.page-about {
  --about-gap: clamp(18px, 4vw, 40px);
  --about-accent: var(--flame);
  background: var(--char);
  color: var(--paper);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-block: 14px 0;
}

.page-about .breadcrumbs {
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumbs a {
  color: var(--paper-mute);
  text-decoration: none;
}

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

.page-about .breadcrumbs li[aria-current] {
  color: var(--paper-faint);
}

/* ---------- 首屏档案封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(26px, 5vw, 58px) clamp(38px, 6vw, 78px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto 30%;
  height: 130%;
  background: radial-gradient(circle at 62% 18%, rgba(255, 90, 42, 0.22), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7vw, 4.2rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  text-wrap: balance;
}

.page-about .about-hero__mark {
  color: var(--flame);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin-top: 18px;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.78;
  color: var(--paper-mute);
}

.page-about .about-hero__figures {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-hero__fig {
  border-top: 1px solid var(--hair-dark);
  padding-top: 8px;
}

.page-about .about-hero__fig b {
  display: block;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  color: var(--cyan);
  line-height: 1.2;
}

.page-about .about-hero__fig span {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--paper-faint);
}

.page-about .about-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

/* ---------- 发展历程 ---------- */
.page-about .about-track {
  background: var(--paper);
  color: var(--ink);
  border-top: 6px solid var(--flame);
  padding-block: clamp(38px, 6vw, 84px) clamp(40px, 6vw, 90px);
}

.page-about .about-track__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-track__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.6vw, 2.9rem);
  line-height: 1.04;
  margin: 12px 0 0;
}

.page-about .about-track__note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-mute);
}

.page-about .about-years {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-years a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 12px;
  border-left: 2px solid var(--hair-light);
  color: var(--ink-mute);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-years a .mono {
  font-weight: 700;
  color: var(--flame-deep);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  color: var(--ink);
  border-left-color: var(--flame);
  background: rgba(255, 90, 42, 0.1);
}

.page-about .track-item {
  position: relative;
  scroll-margin-top: 110px;
  margin-bottom: 14px;
  padding: 18px 20px 20px;
  border: 1px solid var(--hair-light);
  border-left: 3px solid var(--flame);
  background: linear-gradient(180deg, rgba(231, 216, 191, 0.5), rgba(245, 242, 234, 0));
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease), border-left-color 0.24s var(--ease);
}

.page-about .track-item:hover,
.page-about .track-item:focus-within,
.page-about .track-item:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(18, 19, 22, 0.14);
  border-left-color: var(--amber);
}

.page-about .track-item__year {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .track-item__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  line-height: 1.16;
}

.page-about .track-item__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-mute);
}

.page-about .about-stats {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair-light);
  border: 1px solid var(--hair-light);
}

.page-about .about-stats__cell {
  background: var(--paper);
  padding: 16px 14px;
}

.page-about .about-stats__cell b {
  display: block;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  color: var(--char);
}

.page-about .about-stats__cell span {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-about .about-banner {
  margin-top: clamp(28px, 4vw, 52px);
}

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

/* ---------- 内容体系 ---------- */
.page-about .about-scope {
  position: relative;
  overflow: hidden;
  background: var(--pitch);
  padding-block: clamp(38px, 6vw, 86px);
}

.page-about .about-scope::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(36, 240, 200, 0.05) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(36, 240, 200, 0.04) 0 1px, transparent 1px 64px);
  mask-image: radial-gradient(circle at 70% 30%, #000 0%, transparent 78%);
}

.page-about .about-scope__grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-scope__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.6vw, 2.9rem);
  line-height: 1.04;
  margin: 12px 0 0;
}

.page-about .about-scope__text {
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper-mute);
}

.page-about .about-scope__tags {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .scope-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .scope-card {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--hair-dark);
  background: rgba(245, 242, 234, 0.045);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .scope-card:hover,
.page-about .scope-card:focus-within {
  transform: translateY(-3px);
  background: rgba(36, 240, 200, 0.08);
  border-color: rgba(36, 240, 200, 0.4);
}

.page-about .scope-card__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .scope-card__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 1.24rem;
  letter-spacing: 0.01em;
}

.page-about .scope-card__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-mute);
}

/* ---------- 数据编辑部 ---------- */
.page-about .about-desk {
  background: var(--pulp);
  color: var(--ink);
  padding-block: clamp(38px, 6vw, 86px);
}

.page-about .about-desk__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-desk__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.6vw, 2.9rem);
  line-height: 1.05;
  margin: 12px 0 0;
}

.page-about .about-desk__text {
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-mute);
}

.page-about .desk-ring {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 26px;
}

.page-about .desk-ring__chart {
  width: 132px;
  height: 132px;
  flex: none;
}

.page-about .desk-ring__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 168px;
  flex: 1 1 168px;
}

.page-about .desk-ring__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 0;
  border-bottom: 1px solid var(--hair-light);
  font-size: 13px;
  color: var(--ink-mute);
}

.page-about .desk-ring__legend b {
  margin-left: auto;
  color: var(--char);
  font-size: 14px;
}

.page-about .dot {
  width: 9px;
  height: 9px;
  flex: none;
  display: inline-block;
}

.page-about .dot--flame { background: var(--flame); }
.page-about .dot--deep { background: var(--flame-deep); }
.page-about .dot--slate { background: var(--slate); }

.page-about .flow-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-card {
  position: relative;
  padding: 18px 18px 20px 24px;
  background: var(--paper);
  border: 1px solid var(--hair-light);
  box-shadow: 0 10px 26px rgba(18, 19, 22, 0.1);
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .flow-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--slate);
  transition: background-color 0.24s var(--ease), width 0.24s var(--ease);
}

.page-about .flow-card:hover,
.page-about .flow-card:focus-within,
.page-about .flow-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px rgba(18, 19, 22, 0.18);
  outline: none;
}

.page-about .flow-card:hover::before,
.page-about .flow-card:focus-within::before,
.page-about .flow-card:focus-visible::before {
  background: var(--flame);
  width: 6px;
}

.page-about .flow-card__idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--flame-deep);
}

.page-about .flow-card__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 1.24rem;
}

.page-about .flow-card__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

.page-about .about-desk__figure {
  margin: 16px 0 0;
}

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

/* ---------- 产品演进 ---------- */
.page-about .about-steps {
  background: var(--indigo);
  padding-block: clamp(38px, 6vw, 86px);
}

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

.page-about .about-steps__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.6vw, 2.9rem);
  line-height: 1.05;
  margin: 12px 0 0;
}

.page-about .about-steps__text {
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper-mute);
}

.page-about .about-steps__grid {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .step-card {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--hair-dark);
  border-top: 3px solid var(--flame);
  background: rgba(18, 19, 22, 0.42);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .step-card:hover,
.page-about .step-card:focus-within {
  transform: translateY(-3px);
  background: rgba(18, 19, 22, 0.68);
}

.page-about .step-card__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .step-card__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 1.24rem;
}

.page-about .step-card__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-mute);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--wine);
  padding-block: clamp(38px, 6vw, 86px);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-partners__title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.4vw, 2.7rem);
  line-height: 1.06;
  margin: 12px 0 0;
}

.page-about .about-partners__text {
  margin: 14px 0 22px;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(245, 242, 234, 0.78);
}

.page-about .eyebrow--paper {
  color: var(--pulp);
}

.page-about .partner-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}

.page-about .partner-tag {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid rgba(245, 242, 234, 0.26);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 242, 234, 0.82);
  background: rgba(18, 19, 22, 0.16);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .partner-tag:hover,
.page-about .partner-tag:focus-visible {
  color: var(--char);
  background: var(--amber);
  border-color: var(--amber);
}

/* ---------- 服务与联系 ---------- */
.page-about .about-contact {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(38px, 6vw, 86px);
}

.page-about .about-contact__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-contact__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.6vw, 2.9rem);
  line-height: 1.05;
  margin: 12px 0 0;
}

.page-about .contact-block {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid var(--hair-light);
}

.page-about .contact-block__title {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.04em;
}

.page-about .contact-block__text {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

.page-about .about-contact__links {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .contact-card {
  align-self: start;
  padding: 22px 20px 24px;
  background: var(--paper);
  border: 1px solid var(--hair-light);
  border-top: 5px solid var(--flame);
  box-shadow: 0 16px 34px rgba(18, 19, 22, 0.14);
}

.page-about .contact-card__head {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--slate);
}

.page-about .contact-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--hair-light);
}

.page-about .contact-item__label {
  flex: 0 0 100%;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .contact-item__value {
  flex: 1 1 180px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--char);
  word-break: break-word;
}

.page-about .copy-btn {
  flex: none;
  padding: 5px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--char);
  background: var(--pulp);
  border: 1px solid var(--hair-light);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .copy-btn:hover,
.page-about .copy-btn:focus-visible {
  background: var(--flame);
  border-color: var(--flame);
  color: var(--char);
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .contact-card__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--slate);
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

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

@media (min-width: 980px) {
  .page-about .about-track__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .about-track__rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-years {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-years a {
    width: 100%;
  }

  .page-about .about-scope__grid,
  .page-about .about-desk__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(30px, 4.5vw, 58px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .track-item,
  .page-about .scope-card,
  .page-about .step-card,
  .page-about .flow-card,
  .page-about .partner-tag,
  .page-about .copy-btn {
    transition: none;
  }

  .page-about .track-item:hover,
  .page-about .track-item:focus-within,
  .page-about .scope-card:hover,
  .page-about .step-card:hover,
  .page-about .flow-card:hover,
  .page-about .flow-card:focus-within {
    transform: none;
  }
}