.page-about {
  --about-width: 1240px;
  --about-gap: clamp(20px, 3vw, 40px);
  background-color: var(--c-night);
  background-image:
    linear-gradient(rgba(169, 183, 198, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 183, 198, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--c-white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .container {
  width: 100%;
  max-width: var(--about-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 40px) clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(46%, 520px);
  height: 6px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-gold) 60%, var(--c-sky));
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb__link {
  color: var(--c-mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--c-sky);
}

.page-about .breadcrumb__item [aria-current="page"] {
  color: var(--c-gold);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero .display-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-white);
  transform: skewX(-2.5deg);
}

.page-about .about-hero .lead {
  max-width: 56ch;
  margin: 0 0 26px;
  color: var(--c-mist);
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.8;
}

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

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-mid);
  background: var(--c-lift);
  transform: skewX(-6deg);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transform: skewX(6deg) scale(1.04);
}

.page-about .about-hero__figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.page-about .hero-facts {
  display: grid;
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--c-night);
}

.page-about .hero-fact__num {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 600;
  color: var(--c-gold);
  line-height: 1.1;
}

.page-about .hero-fact__label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--c-mist);
}

/* ---------- 通用文案 ---------- */
.page-about .about-text {
  margin: 0 0 16px;
  color: var(--c-mist);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .section-head {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.2;
  color: var(--c-white);
}

.page-about .section-head .lead {
  max-width: 62ch;
  margin: 12px 0 0;
  color: var(--c-mist);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--c-gold);
}

.page-about .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--c-orange);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .origin-points {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .origin-points li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.9rem;
  color: var(--c-white);
}

.page-about .origin-points .mono {
  min-width: 68px;
  color: var(--c-orange);
  font-size: 0.82rem;
}

.page-about .origin-note {
  padding: 22px;
  border: 1px solid var(--line-mid);
  background: var(--c-lift);
  align-self: start;
}

.page-about .origin-note__kicker {
  margin: 0 0 10px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-sky);
}

.page-about .origin-note__text {
  margin: 0 0 18px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-white);
}

.page-about .origin-note .link-arrow {
  color: var(--c-gold);
  text-decoration: none;
  font-size: 0.86rem;
  border-bottom: 1px solid var(--c-gold);
  padding-bottom: 2px;
}

/* ---------- 分类树 ---------- */
.page-about .about-taxonomy {
  background: linear-gradient(180deg, rgba(16, 42, 67, 0.55), rgba(8, 28, 44, 0));
  border-bottom: 1px solid var(--line-soft);
}

.page-about .taxonomy-count {
  align-self: end;
  margin: 0;
  padding: 10px 14px;
  border: 1px solid var(--line-mid);
  color: var(--c-gold);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.page-about .tree {
  position: relative;
  display: grid;
  gap: 10px;
  padding-left: 22px;
  border-left: 1px solid var(--line-mid);
}

.page-about .tree__node {
  position: relative;
  border: 1px solid var(--line-soft);
  background: var(--c-lift);
}

.page-about .tree__node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 26px;
  width: 10px;
  height: 10px;
  background: var(--c-orange);
}

.page-about .tree__node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  border-left: 3px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .tree__node summary::-webkit-details-marker {
  display: none;
}

.page-about .tree__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--c-gold);
}

.page-about .tree__node[open] summary {
  border-left-color: var(--c-orange);
  background: rgba(255, 107, 53, 0.07);
}

.page-about .tree__node[open] summary::after {
  content: "—";
}

.page-about .tree__idx {
  font-size: 0.76rem;
  color: var(--c-sky);
}

.page-about .tree__name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .tree__count {
  margin-left: auto;
  font-size: 0.74rem;
  color: var(--c-mist);
}

.page-about .tree__node summary::after {
  order: 9;
}

.page-about .tree__node p {
  margin: 0;
  padding: 0 18px 18px;
  color: var(--c-mist);
  font-size: 0.92rem;
  line-height: 1.8;
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

.page-about .taxonomy-foot {
  margin: 24px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--c-gold);
  background: rgba(217, 164, 65, 0.08);
  color: var(--c-mist);
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-about .taxonomy-foot .link-arrow {
  color: var(--c-gold);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line-mid);
  background: var(--c-lift);
}

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

.page-about .about-team__figure figcaption {
  padding: 9px 12px;
  border-top: 1px solid var(--line-soft);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.page-about .bars {
  display: grid;
  gap: 14px;
  margin: 24px 0;
  padding: 0;
  list-style: none;
}

.page-about .bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  align-items: center;
}

.page-about .bar__label {
  font-size: 0.86rem;
  color: var(--c-white);
}

.page-about .bar__num {
  font-size: 0.86rem;
  color: var(--c-gold);
}

.page-about .bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 8px;
  background: rgba(169, 183, 198, 0.16);
}

.page-about .bar__fill {
  display: block;
  height: 100%;
}

.page-about .bar__fill--orange {
  background: var(--c-orange);
}

.page-about .bar__fill--gold {
  background: var(--c-gold);
}

.page-about .bar__fill--sky {
  background: var(--c-sky);
}

.page-about .team-facts {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .team-fact {
  padding: 14px 16px;
  background: var(--c-night);
}

.page-about .team-fact dt {
  margin-bottom: 4px;
  font-size: 0.82rem;
  color: var(--c-orange);
  letter-spacing: 0.02em;
}

.page-about .team-fact dd {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, rgba(8, 28, 44, 0), rgba(16, 42, 67, 0.5));
  border-bottom: 1px solid var(--line-soft);
}

.page-about .timeline-hint {
  margin: 0;
  align-self: end;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--c-gold);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 35px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-mid);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  padding: 16px 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 31px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--c-gold);
}

.page-about .timeline__item--current::before {
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.page-about .timeline__year {
  font-size: 0.95rem;
  color: var(--c-gold);
  padding-top: 2px;
}

.page-about .timeline__item--current .timeline__year {
  color: var(--c-orange);
}

.page-about .timeline__body {
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  background: rgba(16, 42, 67, 0.72);
  margin-left: 6px;
}

.page-about .timeline__body h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .timeline__body p {
  margin: 0;
  color: var(--c-mist);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .timeline__body .tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  background: var(--c-orange);
  color: var(--c-ink);
}

.page-about .about-timeline__figure {
  margin: 28px 0 0;
  border: 1px solid var(--line-mid);
  background: var(--c-lift);
}

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

.page-about .about-timeline__figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .filter-btn {
  padding: 8px 14px;
  border: 1px solid var(--line-mid);
  background: transparent;
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .filter-btn:hover {
  color: var(--c-white);
  border-color: var(--c-sky);
}

.page-about .filter-btn.is-active,
.page-about .filter-btn[aria-pressed="true"] {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: var(--c-ink);
}

.page-about .eco-grid {
  display: grid;
  gap: 14px;
}

.page-about .eco-card {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--c-sky);
  background: var(--c-lift);
}

.page-about .eco-card:nth-child(2) {
  border-top-color: var(--c-orange);
}

.page-about .eco-card:nth-child(3) {
  border-top-color: var(--c-gold);
}

.page-about .eco-card__num {
  margin: 0 0 10px;
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--c-white);
  line-height: 1;
}

.page-about .eco-card__num span {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--c-mist);
  margin-left: 4px;
}

.page-about .eco-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--c-gold);
}

.page-about .eco-card > p {
  margin: 0 0 14px;
  color: var(--c-mist);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .eco-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .eco-card__list li {
  padding: 7px 0 7px 14px;
  position: relative;
  font-size: 0.84rem;
  color: var(--c-white);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .eco-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 6px;
  height: 1px;
  background: var(--c-orange);
}

.page-about .honor {
  display: grid;
  gap: 1px;
  margin-top: 24px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .honor__item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--c-night);
}

.page-about .honor__year {
  font-size: 0.82rem;
  color: var(--c-orange);
  min-width: 44px;
}

.page-about .honor__name {
  margin: 0;
  font-size: 0.92rem;
  color: var(--c-white);
}

.page-about .honor__note {
  margin: 0;
  padding: 16px 18px;
  background: var(--c-night);
  color: var(--c-mist);
  font-size: 0.86rem;
  line-height: 1.75;
}

/* ---------- 覆盖数据 ---------- */
.page-about .about-reach {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .reach-list {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .reach-item {
  display: grid;
  gap: 4px;
  padding: 20px 18px;
  background: var(--c-night);
  border-left: 3px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .reach-item:hover {
  border-left-color: var(--c-orange);
  background: var(--c-lift);
}

.page-about .reach-item__num {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--c-gold);
  line-height: 1;
}

.page-about .reach-item__unit {
  font-size: 0.86rem;
  color: var(--c-white);
}

.page-about .reach-item__desc {
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--c-mist);
}

/* ---------- 合作 CTA ---------- */
.page-about .about-cta {
  position: relative;
  padding-block: clamp(40px, 6vw, 72px);
  background: linear-gradient(115deg, rgba(255, 107, 53, 0.16), rgba(217, 164, 65, 0.1) 55%, rgba(63, 167, 214, 0.12));
  border-top: 1px solid var(--line-mid);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-gold) 55%, var(--c-sky));
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .about-cta .lead {
  max-width: 58ch;
  margin: 12px 0 0;
  color: var(--c-white);
  font-size: 0.96rem;
  line-height: 1.8;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .page-about .reach-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .team-facts {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .honor__note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
  }

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

  .page-about .about-origin__grid {
    grid-template-columns: 1.6fr 1fr;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.85fr 1.15fr;
  }

  .page-about .section-head {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .page-about .timeline__item {
    grid-template-columns: 120px 1fr;
    gap: 28px;
    padding: 18px 0;
  }

  .page-about .timeline::before {
    left: 59px;
  }

  .page-about .timeline__item::before {
    left: 55px;
  }

  .page-about .timeline__body {
    margin-left: 14px;
  }

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

  .page-about .reach-list {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1.5fr auto;
  }
}
<<<PAGE_CSS_END>>>