.page-about {
  --about-line: 1px solid var(--grid);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--about-line);
  padding: clamp(24px, 4.5vw, 48px) 0 clamp(36px, 5.5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(128deg, rgba(79, 240, 208, 0.13) 0%, rgba(79, 240, 208, 0) 46%),
    linear-gradient(112deg, rgba(255, 138, 61, 0.12) 0%, rgba(255, 138, 61, 0) 28%);
  clip-path: polygon(0 0, 100% 0, 100% 56%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 128px 100%;
  opacity: 0.28;
  clip-path: polygon(0 0, 100% 0, 100% 40%, 0 74%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(30px, 5.6vw, 58px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0;
  max-width: 16em;
}

.page-about .about-lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(232, 244, 238, 0.86);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

/* 主体骨架 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: clamp(28px, 4.5vw, 56px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

/* 章节目录 */
.page-about .about-toc {
  margin: 0 0 26px;
  min-width: 0;
}

.page-about .about-toc-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
  margin: 0 0 10px;
}

.page-about .about-toc-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .toc-item {
  flex: 0 0 auto;
}

.page-about .toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .toc-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

/* 章节 */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding-bottom: clamp(44px, 6vw, 84px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter .chapter-band {
  margin-bottom: 20px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-chapter h2,
.page-about .about-collab h2 {
  font-family: var(--font-head);
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 18px;
  max-width: 20em;
}

.page-about .prose {
  max-width: 34em;
}

.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(232, 244, 238, 0.86);
}

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

/* 图文分栏 */
.page-about .about-split {
  display: grid;
  gap: 24px;
  align-items: start;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-figure .media-caption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--grid);
  background: var(--panel);
}

.page-about .about-figure--flow {
  margin-top: 30px;
}

.page-about .about-figure--wide {
  margin-top: 34px;
}

/* 四步流程 */
.page-about .flow {
  display: flex;
  flex-direction: column;
  margin-top: 26px;
}

.page-about .flow-step {
  position: relative;
  padding: 14px 0 14px 16px;
  border-left: 2px solid var(--grid);
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 6px;
}

.page-about .flow-step h3 {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(232, 244, 238, 0.8);
}

.page-about .flow-arrow {
  width: 38px;
  height: 18px;
  color: var(--grid);
  align-self: center;
  margin: 2px 0;
  transform: rotate(90deg);
}

/* 团队 */
.page-about .about-chapter--crew {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .crew {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .crew-card {
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  padding: 22px 20px;
}

.page-about .crew-avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  margin-bottom: 18px;
  background:
    linear-gradient(135deg, rgba(79, 240, 208, 0.42) 0%, rgba(18, 48, 40, 0.9) 62%),
    var(--band);
  position: relative;
  overflow: hidden;
}

.page-about .crew-avatar::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(135deg, transparent 48%, rgba(125, 247, 222, 0.5) 49%, transparent 50%);
}

.page-about .crew-card:nth-child(2) .crew-avatar {
  background:
    linear-gradient(135deg, rgba(255, 138, 61, 0.4) 0%, rgba(18, 48, 40, 0.9) 62%),
    var(--band);
}

.page-about .crew-card:nth-child(3) .crew-avatar {
  background:
    linear-gradient(135deg, rgba(255, 194, 77, 0.36) 0%, rgba(18, 48, 40, 0.9) 62%),
    var(--band);
}

.page-about .crew-num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 8px;
}

.page-about .crew-num .data-num {
  font-family: var(--font-mono);
  font-size: clamp(36px, 6vw, 46px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .crew-unit {
  font-size: 13px;
  color: var(--mist);
}

.page-about .crew-card h3 {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .crew-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(232, 244, 238, 0.8);
}

/* 档案规模 */
.page-about .stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  margin-top: 26px;
}

.page-about .stat {
  background: var(--panel);
  padding: 22px 20px;
}

.page-about .stat-num {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .stat-num .data-num {
  font-family: var(--font-mono);
  font-size: clamp(42px, 8vw, 62px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-unit {
  font-size: 13px;
  color: var(--mist);
}

.page-about .stat-label {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(232, 244, 238, 0.8);
}

.page-about .about-archive-note {
  margin-top: 24px;
}

/* 版本时间轴 */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--grid);
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-dot {
  position: absolute;
  left: -27px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tl-item--current .tl-dot {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  transform: scale(1.35);
  border-color: var(--cyan-hi);
}

.page-about .tl-ver {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
  margin: 0 0 4px;
}

.page-about .tl-item--current .tl-ver {
  color: var(--amber);
}

.page-about .tl-title {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-list li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 244, 238, 0.8);
}

.page-about .tl-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 5px;
  height: 1px;
  background: var(--grid);
}

/* 合作收尾 */
.page-about .about-collab {
  margin-top: 8px;
  padding: clamp(24px, 4vw, 44px) clamp(20px, 3.4vw, 40px);
  background: linear-gradient(135deg, rgba(18, 48, 40, 0.96) 0%, rgba(7, 19, 15, 0.96) 70%);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-collab h2 {
  margin-bottom: 14px;
}

.page-about .about-collab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  margin: 26px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-next a {
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

/* 断点 */
@media (min-width: 640px) {
  .page-about .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 780px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(24px, 3.6vw, 44px);
  }

  .page-about .flow {
    flex-direction: row;
    align-items: stretch;
    margin-top: 30px;
  }

  .page-about .flow-step {
    flex: 1 1 0;
    min-width: 0;
    border-left: none;
    border-top: 2px solid var(--grid);
    padding: 18px 14px 0 0;
  }

  .page-about .flow-arrow {
    flex: 0 0 40px;
    width: 40px;
    align-self: flex-start;
    margin-top: 22px;
    transform: none;
  }

  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin: 0;
    align-self: start;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--grid);
  }

  .page-about .toc-link {
    border: none;
    border-radius: 0;
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    border-left: 1px solid transparent;
    white-space: normal;
    font-size: 13.5px;
    line-height: 1.5;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible {
    border-left-color: var(--cyan);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }

  .page-about .timeline {
    padding: 34px 0 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .timeline::before {
    left: 0;
    right: 0;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .tl-item {
    padding: 0 22px 0 0;
  }

  .page-about .tl-dot {
    left: 0;
    top: -28px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 216px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link,
  .page-about .tl-dot,
  .page-about .about-next a {
    transition: none;
  }

  .page-about .tl-item:hover .tl-dot,
  .page-about .tl-item:focus-within .tl-dot {
    transform: none;
  }
}
<<<END>>>