.page-about {
  background: var(--ink-950);
  color: var(--chalk-050);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(88px, 12vw, 148px) 0 clamp(48px, 7vw, 88px);
  border-bottom: 1px solid var(--ink-600);
}

.page-about .about-hero__body {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(34px, 6.2vw, 68px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-hero__sub {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--chalk-050);
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--turf-500);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--turf-300);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin: 40px 0 0;
  padding-top: 30px;
  border-top: 1px dashed var(--ink-600);
}

.page-about .about-hero__facts dt {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mute-400);
}

.page-about .about-hero__facts dd {
  margin: 8px 0 0;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--turf-300);
  font-variant-numeric: tabular-nums;
}

/* ---------- 品牌定位 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-origin__copy p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--chalk-050);
}

.page-about .about-origin__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

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

.page-about .about-origin__figure .figure__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-origin__figure .figure__caption {
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute-400);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline__visual {
  margin: 44px 0 36px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-timeline__visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.85;
}

.page-about .about-timeline__accordion {
  border-top: 1px solid var(--ink-600);
}

.page-about .about-timeline__item {
  border-bottom: 1px solid var(--ink-600);
}

.page-about .about-timeline__trigger {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto 20px;
  gap: 14px;
  align-items: center;
  width: 100%;
  padding: 22px 0;
  background: transparent;
  border: 0;
  color: inherit;
  text-align: left;
  cursor: pointer;
  font: inherit;
  transition: color 220ms var(--ease);
}

.page-about .about-timeline__node {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-pill);
  border: 2px solid var(--turf-500);
  background: transparent;
  transition: background 260ms var(--ease);
}

.page-about .about-timeline__trigger[aria-expanded="true"] .about-timeline__node {
  background: var(--turf-500);
  box-shadow: 0 0 0 5px rgba(22, 193, 114, 0.16);
}

.page-about .about-timeline__label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-timeline__stage {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__hint {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute-400);
}

.page-about .about-timeline__ver {
  font-size: 15px;
  color: var(--signal-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__trigger:hover .about-timeline__stage {
  color: var(--turf-300);
}

.page-about .about-timeline__item .accordion__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute-400);
}

/* ---------- 栏目体系（浅底） ---------- */
.page-about .about-structure {
  background: var(--chalk-050);
  color: var(--chalk-900);
}

.page-about .about-structure .eyebrow {
  color: var(--ink-800);
}

.page-about .about-structure .section-title {
  color: var(--chalk-900);
}

.page-about .about-structure .lede {
  color: var(--ink-800);
}

.page-about .about-structure__scale {
  display: grid;
  gap: 34px;
  margin-top: 48px;
}

.page-about .about-scale {
  position: relative;
  padding-top: 26px;
  border-top: 2px dashed rgba(11, 26, 36, 0.28);
}

.page-about .about-scale__num {
  display: block;
  font-size: clamp(52px, 8.5vw, 92px);
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--ink-950);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__label {
  margin: 16px 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--chalk-900);
}

.page-about .about-scale__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-800);
}

.page-about .about-scale__tip {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(11, 26, 36, 0.45);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}

.page-about .about-scale:hover .about-scale__tip,
.page-about .about-scale:focus-within .about-scale__tip {
  opacity: 1;
  transform: translateY(0);
}

.page-about .about-structure__link-line {
  margin: 48px 0 0;
  padding-top: 24px;
  border-top: 1px solid rgba(11, 26, 36, 0.16);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about .about-structure__link-line a {
  color: var(--chalk-900);
  text-decoration: underline;
  text-decoration-color: var(--turf-500);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-about .about-structure__link-line a:hover {
  color: var(--turf-500);
}

/* ---------- 团队与服务 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-team__copy p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--chalk-050);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-team__figure .figure__caption {
  padding: 14px 18px 18px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute-400);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
  margin-top: 52px;
  padding-top: 32px;
  border-top: 1px dashed var(--ink-600);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  color: var(--signal-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute-400);
}

/* ---------- 区域覆盖 ---------- */
.page-about .about-coverage {
  background: var(--ink-800);
}

.page-about .about-coverage__bands {
  display: grid;
  gap: 22px;
  margin-top: 44px;
}

.page-about .about-band {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--ink-950);
  border: 1px solid var(--ink-600);
}

.page-about .about-band--accent {
  border-color: var(--turf-500);
  background: linear-gradient(160deg, rgba(22, 193, 114, 0.14), rgba(7, 19, 28, 0.9) 62%);
}

.page-about .about-band__num {
  display: block;
  font-size: clamp(40px, 6vw, 60px);
  line-height: 1;
  color: var(--turf-300);
  font-variant-numeric: tabular-nums;
}

.page-about .about-band__title {
  margin: 14px 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk-050);
}

.page-about .about-band p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mute-400);
}

.page-about .about-partners {
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px dashed var(--ink-600);
}

.page-about .about-partners__title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--turf-300);
}

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

.page-about .about-partners__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.7;
  color: var(--chalk-050);
}

.page-about .about-partners__list .mono {
  font-size: 20px;
  color: var(--signal-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute-400);
}

.page-about .about-partners__note a {
  color: var(--turf-300);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 更新与归档（浅底） ---------- */
.page-about .about-cadence {
  background: var(--chalk-050);
  color: var(--chalk-900);
}

.page-about .about-cadence .eyebrow {
  color: var(--ink-800);
}

.page-about .about-cadence .section-title {
  color: var(--chalk-900);
}

.page-about .about-cadence__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-cadence__copy p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about .about-cadence__tail {
  margin-bottom: 0;
}

.page-about .about-cadence__tail a {
  color: var(--chalk-900);
  text-decoration: underline;
  text-decoration-color: var(--turf-500);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-about .about-cadence__tail a:hover {
  color: var(--turf-500);
}

.page-about .about-cadence__meta {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 6px 8px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(11, 26, 36, 0.045);
  border-left: 3px solid var(--turf-500);
}

.page-about .about-meta__num {
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--ink-950);
  font-variant-numeric: tabular-nums;
}

.page-about .about-meta__unit {
  font-size: 14px;
  color: var(--ink-800);
}

.page-about .about-meta__label {
  grid-column: 1 / -1;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(11, 26, 36, 0.55);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px 28px;
  }

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

  .page-about .about-coverage__bands {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .about-structure__scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 42px;
    align-items: start;
  }

  .page-about .about-cadence__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 72px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.56fr) minmax(0, 0.44fr);
    gap: 76px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 72px;
  }
}

@media (max-width: 520px) {
  .page-about .about-timeline__trigger {
    grid-template-columns: 14px minmax(0, 1fr) auto;
    row-gap: 10px;
  }

  .page-about .about-timeline__ver {
    grid-column: 2;
  }

  .page-about .about-timeline__trigger .accordion__icon {
    grid-column: 3;
    grid-row: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale__tip,
  .page-about .about-timeline__node,
  .page-about .about-timeline__trigger {
    transition: none;
  }

  .page-about .about-scale__tip {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>