.page-about {
  --about-year-size: clamp(2.6rem, 8vw, 5.6rem);
  --about-hairline: 1px solid var(--rock);
  --about-soft-line: 1px solid rgba(42, 49, 64, 0.7);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 3vw, 2rem);
}

/* ---------- 品牌声明 ---------- */
.page-about .about-declare {
  padding-top: clamp(1.4rem, 3.5vw, 2.6rem);
}

.page-about .about-declare-grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-declare-copy h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1.1rem;
  max-width: 18ch;
}

.page-about .about-declare-copy .lead {
  max-width: 46ch;
}

.page-about .about-declare-copy p {
  max-width: 62ch;
  line-height: 1.75;
  color: var(--bone);
}

.page-about .about-declare-copy p + p {
  margin-top: 1rem;
}

.page-about .about-declare-copy a,
.page-about .about-network-notes a,
.page-about .about-cadence-copy a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 181, 169, 0.5);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-declare-copy a:hover,
.page-about .about-network-notes a:hover,
.page-about .about-cadence-copy a:hover,
.page-about .about-declare-copy a:focus-visible,
.page-about .about-network-notes a:focus-visible,
.page-about .about-cadence-copy a:focus-visible {
  color: var(--flare);
  border-color: var(--flare);
}

.page-about figure {
  margin: 0;
}

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

.page-about .about-declare-figure {
  position: relative;
  border: var(--about-hairline);
  background: var(--night-800);
  overflow: hidden;
}

.page-about .about-declare-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(31, 181, 169, 0.14) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(31, 181, 169, 0.1) 0 1px, transparent 1px 34px);
  mix-blend-mode: screen;
}

.page-about .about-declare-figure img {
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .media-caption {
  display: block;
  padding: 0.65rem 0.9rem;
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  border-top: var(--about-hairline);
  background: var(--night-900);
}

/* ---------- 历程时间轴 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-hairline);
}

.page-about .about-track-item {
  display: grid;
  gap: 0.5rem;
  padding: clamp(1.4rem, 3.4vw, 2.3rem) 0;
  border-bottom: var(--about-hairline);
  position: relative;
}

.page-about .about-track-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 2px;
  background: var(--lake);
  transition: width 0.28s ease, background-color 0.28s ease;
}

.page-about .about-track-item:hover::before,
.page-about .about-track-item:focus-within::before {
  width: 90px;
  background: var(--barley);
}

.page-about .about-year {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: var(--about-year-size);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: var(--bone);
  transition: color 0.25s ease;
}

.page-about .about-track-item:hover .about-year,
.page-about .about-track-item:focus-within .about-year {
  color: var(--lake);
}

.page-about .about-track-body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  letter-spacing: 0.01em;
  margin: 0 0 0.5rem;
  color: var(--bone);
}

.page-about .about-track-body p {
  margin: 0;
  max-width: 64ch;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-principle {
  padding: 1.5rem 1.2rem 1.7rem;
  border-top: 3px solid var(--rock);
  background: linear-gradient(180deg, rgba(18, 32, 58, 0.9), rgba(11, 20, 36, 0.35));
}

.page-about .about-principle--lake {
  border-top-color: var(--lake);
}

.page-about .about-principle--barley {
  border-top-color: var(--barley);
}

.page-about .about-principle--moss {
  border-top-color: var(--moss);
}

.page-about .about-principle-num {
  display: block;
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--mist);
  margin-bottom: 0.9rem;
}

.page-about .about-principle h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.2rem, 2.6vw, 1.55rem);
  margin: 0 0 0.7rem;
  color: var(--bone);
}

.page-about .about-principle p {
  margin: 0;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队与校验 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-team-figure {
  border: var(--about-hairline);
  background: var(--night-800);
}

.page-about .about-team-figure img {
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-team-copy h2 {
  margin-top: 0.5rem;
}

.page-about .about-team-copy > p {
  max-width: 62ch;
  line-height: 1.75;
  color: var(--bone);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2.4rem);
  border-top: var(--about-hairline);
  border-bottom: var(--about-hairline);
  padding-top: clamp(0.9rem, 2vw, 1.2rem);
  padding-bottom: clamp(0.9rem, 2vw, 1.2rem);
}

.page-about .about-role {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-role-num {
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 4.5vw, 2.5rem);
  line-height: 1;
  color: var(--flare);
}

.page-about .about-role-label {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-checks {
  list-style: none;
  counter-reset: check;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-checks li {
  counter-increment: check;
  position: relative;
  padding-left: 2.4rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-checks li::before {
  content: counter(check, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.1rem;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--barley);
}

.page-about .about-checks strong {
  display: block;
  color: var(--bone);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

/* ---------- 合作生态 ---------- */
.page-about .about-network-figure {
  border: var(--about-hairline);
  background: var(--night-900);
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-net {
  display: block;
  width: 100%;
  height: auto;
  background:
    repeating-linear-gradient(90deg, rgba(42, 49, 64, 0.55) 0 1px, transparent 1px 60px),
    var(--night-900);
}

.page-about .about-net-lines line {
  stroke: var(--rock);
  stroke-width: 1;
  transition: stroke 0.25s ease, stroke-opacity 0.25s ease;
}

.page-about .about-net:hover .about-net-lines line {
  stroke: var(--lake);
  stroke-opacity: 0.6;
}

.page-about .about-net-nodes circle {
  fill: var(--lake);
  transition: fill 0.25s ease, r 0.25s ease;
}

.page-about .about-net-nodes circle:nth-child(n + 5) {
  fill: var(--barley);
}

.page-about .about-net-label {
  fill: var(--mist);
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.1em;
}

.page-about .about-network-notes {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-network-notes p {
  margin: 0;
  max-width: 68ch;
  line-height: 1.75;
  color: var(--bone);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .about-cadence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rock);
  border: 1px solid var(--rock);
}

.page-about .about-metric {
  margin: 0;
  padding: clamp(0.9rem, 2.6vw, 1.5rem);
  background: var(--night-900);
}

.page-about .about-metric dt {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--mist);
  margin-bottom: 0.6rem;
}

.page-about .about-metric dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.page-about .about-metric-num {
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 5.4vw, 2.6rem);
  line-height: 1;
  color: var(--flare);
}

.page-about .about-metric-unit {
  font-size: 0.82rem;
  color: var(--mist);
}

.page-about .about-cadence-copy {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.3rem, 3.4vw, 2rem);
}

.page-about .about-cadence-copy p {
  margin: 0;
  max-width: 68ch;
  line-height: 1.75;
  color: var(--bone);
}

.page-about .about-cadence .note {
  margin-top: 1.2rem;
  padding-top: 0.9rem;
  border-top: var(--about-soft-line);
  font-size: 0.86rem;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-track-item {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    gap: clamp(1.5rem, 5vw, 4rem);
    align-items: start;
    padding-left: 1.6rem;
  }

  .page-about .about-track-body {
    padding-top: 0.4rem;
  }

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

@media (min-width: 960px) {
  .page-about .about-declare-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(2rem, 4vw, 3.6rem);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

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

  .page-about .about-track-item {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    padding-left: 2.2rem;
  }

  .page-about .about-network-notes {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(1.4rem, 3vw, 2.6rem);
  }

  .page-about .about-cadence-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track-item::before,
  .page-about .about-year,
  .page-about .about-net-lines line,
  .page-about .about-net-nodes circle {
    transition: none;
  }
}
<<<END>>>