.page-about {
  background: var(--ink-900);
  color: var(--sand);
}

.page-about .section {
  padding: clamp(40px, 6vw, 84px) 0;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 36px) 0 clamp(30px, 5vw, 58px);
  background:
    radial-gradient(760px 380px at 84% -14%, rgba(92, 242, 208, 0.16), transparent 68%),
    radial-gradient(520px 320px at 2% 108%, rgba(255, 180, 84, 0.1), transparent 72%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 82%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(44, 74, 64, 0.55) 1px, transparent 1px);
  background-size: 96px 100%;
  opacity: 0.35;
  pointer-events: none;
}

.page-about .about-hero__inner,
.page-about .about-stats {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.2vw, 66px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
  display: inline-block;
  border-bottom: 2px solid rgba(92, 242, 208, 0.4);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  color: var(--mist);
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.75;
  margin: 0 0 clamp(20px, 3vw, 28px);
}

.page-about .about-hero__actions {
  gap: 10px;
}

.page-about .chapters__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .chapter-list__item {
  border-bottom: 1px solid var(--line);
}

.page-about .chapter-list__link {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 12px 2px;
  color: var(--sand);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .chapter-list__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .chapter-list__label {
  font-size: 14px;
  letter-spacing: 0.01em;
}

.page-about .chapter-list__link:hover,
.page-about .chapter-list__link:focus-visible {
  color: var(--cyan);
  transform: translateX(4px);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-900);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* 品牌起点 */
.page-about .about-origin {
  background: var(--ink-900);
}

.page-about .about-origin__media {
  margin: 0 0 clamp(28px, 4vw, 52px);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-origin__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-origin__media .media__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-about .about-split__rail {
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

.page-about .rail-nav {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .rail-nav__title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .rail-nav__link {
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .rail-nav__link:hover,
.page-about .rail-nav__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sand);
  max-width: 68ch;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-points {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--ink-800);
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-points__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* 三类内容 */
.page-about .about-principles {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-principles__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(22px, 3vw, 34px);
  align-items: start;
}

.page-about .about-tabs__panel {
  padding: 20px 0 0;
}

.page-about .about-tabs__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--sand);
}

.page-about .about-tabs__panel p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .tabs__tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .tabs__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.75;
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sand);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-principles__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .about-principles__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-about .about-principles__media .media__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* 发展历程 */
.page-about .about-timeline {
  border-bottom: 1px solid rgba(44, 74, 64, 0.7);
}

.page-about .about-timeline .section-title {
  color: var(--sand);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(10px, 2vw, 16px) 14px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(92, 242, 208, 0.14);
}

.page-about .stage {
  border-bottom: 1px solid rgba(44, 74, 64, 0.75);
}

.page-about .stage__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  transition: color var(--dur) var(--ease);
}

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

.page-about .stage__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
  min-width: 46px;
}

.page-about .stage__label {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(16px, 2.6vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--sand);
}

.page-about .stage__mark {
  position: relative;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  align-self: center;
}

.page-about .stage__mark::before,
.page-about .stage__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .stage__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .stage__mark::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-about .stage[open] .stage__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .stage__summary:hover .stage__label,
.page-about .stage__summary:focus-visible .stage__label {
  color: var(--cyan);
}

.page-about .stage__body {
  padding: 0 0 18px;
}

.page-about .stage__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 66ch;
}

/* 团队 */
.page-about .about-team {
  background: var(--ink-900);
}

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

.page-about .about-team__flow {
  border-top: 1px solid var(--line);
  padding-top: clamp(18px, 3vw, 26px);
}

.page-about .flow {
  display: block;
  width: 100%;
  height: auto;
  max-width: 560px;
}

.page-about .flow-labels {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .flow-labels__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
}

.page-about .flow-labels__name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--sand);
}

.page-about .flow-labels__desc {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* 校验流程 */
.page-about .about-verify {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-verify__grid {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  margin-top: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-verify__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .about-verify__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-verify__media .media__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

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

.page-about .steps__item {
  background: var(--ink-900);
  padding: 16px 16px 18px;
}

.page-about .steps__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .steps__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--sand);
}

.page-about .steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 覆盖与合作 */
.page-about .about-coverage {
  background: var(--ink-900);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 32px) 0 clamp(28px, 4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-coverage__block {
  background: var(--ink-800);
  padding: 18px 16px 20px;
}

.page-about .about-coverage__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-coverage__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 34ch;
}

.page-about .eco__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .eco-tag {
  display: inline-flex;
  flex-direction: column;
  gap: 0;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: rgba(12, 43, 33, 0.6);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .eco-tag__name {
  font-size: 13px;
  line-height: 1.5;
  color: var(--sand);
  letter-spacing: 0.02em;
}

.page-about .eco-tag__meta {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--cyan);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

.page-about .eco-tag:hover,
.page-about .eco-tag:focus-visible,
.page-about .eco-tag:focus-within {
  border-color: var(--cyan);
  background: rgba(92, 242, 208, 0.08);
  outline: none;
}

.page-about .eco-tag:hover .eco-tag__meta,
.page-about .eco-tag:focus-visible .eco-tag__meta,
.page-about .eco-tag:focus-within .eco-tag__meta {
  max-height: 40px;
  opacity: 1;
  margin-top: 6px;
}

/* 荣誉与承诺 */
.page-about .about-honor {
  background: var(--sand);
  color: var(--ink-900);
  border-top: 1px solid var(--line);
}

.page-about .about-honor .chapter-index,
.page-about .about-honor .section-title {
  color: var(--ink-900);
}

.page-about .about-honor .about-prose p {
  color: var(--ink-800);
}

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

.page-about .about-honor__aside {
  display: grid;
  gap: 1px;
  background: rgba(6, 26, 20, 0.16);
  border: 1px solid rgba(6, 26, 20, 0.16);
}

.page-about .honor-card {
  background: var(--sand);
  padding: 18px 16px 20px;
}

.page-about .honor-card__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--wine);
}

.page-about .honor-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(16px, 2.6vw, 19px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .honor-card__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-700);
}

.page-about .honor-card--cyan {
  background: var(--ink-900);
}

.page-about .honor-card--cyan .honor-card__label {
  color: var(--cyan);
}

.page-about .honor-card--cyan .honor-card__title {
  color: var(--sand);
}

.page-about .honor-card--cyan .honor-card__note {
  color: var(--mist);
}

.page-about .about-closing {
  margin-top: clamp(30px, 5vw, 52px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid rgba(6, 26, 20, 0.22);
  display: grid;
  gap: 16px;
}

.page-about .about-closing__text {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 3vw, 22px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .about-closing__actions {
  gap: 10px;
}

.page-about .about-closing .btn--quiet {
  color: var(--ink-900);
  border-color: rgba(6, 26, 20, 0.35);
}

.page-about .about-closing .btn--quiet:hover,
.page-about .about-closing .btn--quiet:focus-visible {
  color: var(--ink-900);
  border-color: var(--ink-900);
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-split {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(26px, 4vw, 48px);
  }

  .page-about .about-split__rail {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }

  .page-about .about-principles__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(26px, 4vw, 48px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }

  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(26px, 4vw, 44px);
  }

  .page-about .about-honor__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-closing {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.95fr);
  }

  .page-about .timeline__item {
    padding-left: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-list__link,
  .page-about .stage__mark::before,
  .page-about .stage__mark::after,
  .page-about .eco-tag,
  .page-about .eco-tag__meta {
    transition: none;
  }
}
<<<END>>>