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

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .breadcrumbs a {
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .breadcrumbs span[aria-current="page"] {
  color: var(--paper);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -12%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle at center, rgba(53, 224, 208, 0.16), rgba(7, 26, 47, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--amber) 46%, var(--aurora));
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(250, 247, 239, 0.78);
}

.page-about .about-hero__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 72px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.82fr);
    grid-template-areas:
      "eyebrow eyebrow"
      "title lead"
      "meta lead";
    column-gap: 56px;
    row-gap: 14px;
    align-items: end;
  }

  .page-about .about-hero__inner > .eyebrow { grid-area: eyebrow; }
  .page-about .about-hero__title { grid-area: title; }
  .page-about .about-hero__lead { grid-area: lead; }
  .page-about .about-hero__meta { grid-area: meta; }
}

/* 主体骨架 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 34px;
  padding-bottom: 72px;
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 198px minmax(0, 1fr);
    gap: 60px;
    padding-top: 48px;
    padding-bottom: 96px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    align-self: start;
  }
}

.page-about .about-flow {
  display: grid;
  gap: 0;
  min-width: 0;
}

/* 左侧章节索引 */
.page-about .about-index__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gray);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-index__list li {
  border-bottom: 2px solid var(--line);
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 4px;
  font-size: 14px;
  color: rgba(250, 247, 239, 0.82);
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--aurora);
  padding-left: 10px;
}

.page-about .about-index__num {
  font-size: 11px;
  color: var(--amber);
}

/* 章节 */
.page-about .about-chapter {
  padding: 34px 0 50px;
  border-top: 2px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .about-num {
  flex: none;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--orange);
  background: var(--ink);
  color: var(--orange);
  font-size: 14px;
  font-weight: 600;
}

.page-about .about-chapter__title {
  margin: 3px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 4.2vw, 2.05rem);
  line-height: 1.22;
  color: var(--paper);
}

.page-about .about-text {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(250, 247, 239, 0.78);
}

.page-about .about-split {
  display: grid;
  gap: 22px;
  align-items: start;
}

.page-about .about-split--reverse {
  margin-top: 26px;
}

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 34px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }
}

.page-about .media-frame {
  margin: 0;
}

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

.page-about .media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--gray);
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
  padding-left: 20px;
  border-left: 2px solid var(--line);
}

.page-about .about-wire {
  display: none;
}

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

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .about-node__year {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-node__card {
  border: 2px solid var(--line-strong);
  background: var(--ink-2);
  padding: 15px 17px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-node__card h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-node__card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: rgba(250, 247, 239, 0.72);
}

.page-about .about-node__card:hover {
  border-color: var(--aurora);
}

@media (min-width: 820px) {
  .page-about .about-timeline {
    padding-left: 72px;
    border-left: 0;
  }

  .page-about .about-wire {
    display: block;
    position: absolute;
    left: 4px;
    top: 8px;
    width: 40px;
    height: calc(100% - 16px);
  }

  .page-about .about-node {
    grid-template-columns: 78px minmax(0, 1fr);
    column-gap: 22px;
    align-items: start;
  }

  .page-about .about-node__year {
    padding-top: 17px;
    text-align: right;
  }

  .page-about .about-node::before {
    content: "";
    position: absolute;
    top: 20px;
    left: -64px;
    width: 14px;
    height: 14px;
    border: 2px solid var(--aurora);
    border-radius: 50%;
    background: var(--ink);
  }

  .page-about .about-node__card:hover {
    transform: translateX(4px);
  }
}

/* 服务覆盖数据 */
.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-stats li {
  padding: 16px 12px 18px 0;
  border-bottom: 2px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stats__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--gray);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-stats li {
    border-right: 2px solid var(--line);
    padding-right: 14px;
  }

  .page-about .about-stats li:last-child {
    border-right: 0;
  }
}

/* 纸面章节 */
.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--black);
  border: 2px solid var(--black);
  border-top: 2px solid var(--black);
  box-shadow: var(--shadow-hard-dark);
  padding: 28px 20px 32px;
  margin-bottom: 40px;
}

.page-about .about-chapter--paper .about-chapter__title {
  color: var(--black);
}

.page-about .about-chapter--paper .about-text {
  color: rgba(16, 24, 32, 0.8);
}

.page-about .about-chapter--paper .about-num {
  background: var(--paper);
  color: var(--orange);
}

.page-about .about-chapter--paper .media-frame__caption {
  color: rgba(16, 24, 32, 0.6);
}

@media (min-width: 820px) {
  .page-about .about-chapter--paper {
    padding: 34px 30px 38px;
  }
}

.page-about .about-tagwall {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 22px;
  padding: 0;
}

.page-about .about-tagwall li {
  padding: 7px 12px;
  font-size: 13px;
  line-height: 1.4;
  border: 1px solid rgba(16, 24, 32, 0.35);
  background: #FFFFFF;
  color: var(--black);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-tagwall li:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: #FFFFFF;
}

/* 团队与生态 */
.page-about .about-facts {
  margin: 22px 0 24px;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 2px solid var(--line);
}

.page-about .about-facts__row dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: rgba(250, 247, 239, 0.78);
}

@media (min-width: 700px) {
  .page-about .about-facts__row {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

.page-about .about-badges {
  display: grid;
  gap: 12px;
}

.page-about .about-badges__item {
  margin: 0;
  padding: 13px 16px;
  border: 2px solid var(--line);
  background: rgba(14, 42, 71, 0.6);
  font-size: 0.94rem;
  line-height: 1.7;
  color: rgba(250, 247, 239, 0.78);
}

.page-about .about-badges__item .mono {
  display: inline-block;
  margin-right: 8px;
  font-size: 12px;
  color: var(--aurora);
  letter-spacing: 0.06em;
}

/* 版本 */
.page-about .about-versions {
  display: grid;
  gap: 14px;
  margin: 22px 0 24px;
}

@media (min-width: 700px) {
  .page-about .about-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .about-version {
  border: 2px solid var(--line-strong);
  background: var(--ink-2);
  padding: 18px;
  display: grid;
  gap: 10px;
  justify-items: start;
}

.page-about .about-version__no {
  font-size: clamp(1.2rem, 3.4vw, 1.5rem);
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-version__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(250, 247, 239, 0.72);
}

.page-about .version-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border: 2px solid var(--line-strong);
  background: transparent;
  color: var(--amber);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .version-chip:hover,
.page-about .version-chip:focus-visible {
  border-color: var(--aurora);
  color: var(--aurora);
}

.page-about .version-chip[data-copied] {
  border-color: var(--aurora);
  color: var(--aurora);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* 后续入口 */
.page-about .about-next {
  margin-top: 10px;
  padding: 30px 0 8px;
  border-top: 2px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.6vw, 1.7rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .about-next__grid .quick-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  border: 2px solid var(--line-strong);
  background: rgba(14, 42, 71, 0.55);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.6;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next__grid .quick-link:hover,
.page-about .about-next__grid .quick-link:focus-visible {
  border-color: var(--aurora);
  background: rgba(20, 56, 92, 0.85);
  transform: translateY(-2px);
}

.page-about .about-next__grid .quick-num {
  flex: none;
  font-size: 12px;
  color: var(--amber);
}

.page-about .about-next__label {
  min-width: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-node__card,
  .page-about .about-next__grid .quick-link,
  .page-about .version-chip,
  .page-about .about-tagwall li {
    transition: none;
  }

  .page-about .about-node__card:hover,
  .page-about .about-next__grid .quick-link:hover {
    transform: none;
  }
}
<<<END>>>