.page-about {
  background: var(--cream-50);
  color: var(--charcoal-900);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

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

/* ---------- 首屏视觉带 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--pitch-950);
  color: var(--cream-50);
  isolation: isolate;
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .36;
  filter: saturate(.6) contrast(1.05);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(104deg, rgba(6, 26, 18, .96) 0%, rgba(6, 26, 18, .82) 48%, rgba(12, 43, 31, .46) 100%),
    repeating-linear-gradient(90deg, transparent 0 118px, rgba(200, 255, 61, .055) 118px 119px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(38px, 7vw, 92px) clamp(36px, 6vw, 80px);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 24px;
  font-size: 13px;
  letter-spacing: .02em;
  color: rgba(251, 248, 239, .62);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(251, 248, 239, .84);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--lime-400);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 64px);
  line-height: 1.05;
  letter-spacing: -.025em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(28px, 4vw, 40px);
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: rgba(251, 248, 239, .8);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 18px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid rgba(251, 248, 239, .18);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 6px 0;
}

.page-about .about-stats .num {
  font-family: var(--font-data);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--lime-400);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats .lbl {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(251, 248, 239, .58);
}

/* ---------- 正文画布 ---------- */
.page-about .about-body {
  padding-block: clamp(34px, 5.6vw, 72px) clamp(44px, 6.5vw, 88px);
  background: var(--cream-50);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 52px);
}

/* 章节索引 */
.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: 12.5px;
  letter-spacing: .22em;
  color: var(--ink-brown);
  opacity: .72;
}

.page-about .about-index ol {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  border-bottom: 1px solid var(--line);
}

.page-about .about-index a {
  display: flex;
  gap: 7px;
  align-items: baseline;
  padding: 7px 11px;
  white-space: nowrap;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--charcoal-900);
  text-decoration: none;
  border-radius: 2px;
  transition: background .2s var(--ease), color .2s var(--ease);
}

.page-about .about-index a i {
  font-style: normal;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--pitch-600);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  background: var(--cream-100);
  color: var(--signal-orange-deep);
}

/* 章节 */
.page-about .about-chapter {
  padding-block: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.85;
  color: #2f2d28;
}

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

.page-about .about-chapter .chapter-label {
  margin: 0 0 8px;
  font-family: var(--font-editorial);
  font-size: 12.5px;
  letter-spacing: .22em;
  color: var(--pitch-600);
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--charcoal-900);
}

/* 四步流程 */
.page-about .step-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .step-num {
  padding-top: 2px;
  font-family: var(--font-editorial);
  font-size: 23px;
  line-height: 1;
  color: var(--pitch-600);
}

.page-about .step-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--charcoal-900);
}

.page-about .step-list p {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: #3b3830;
}

/* 配图 */
.page-about .about-figure {
  margin: clamp(22px, 3.6vw, 34px) 0 0;
}

.page-about .about-figure .media-frame {
  overflow: hidden;
  border-radius: 2px;
}

.page-about .about-figure .media-frame__cap {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  line-height: 1.6;
  color: #6f6a5f;
}

/* 覆盖范围数据带 */
.page-about .range-band {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin: clamp(20px, 3vw, 28px) 0;
  padding: clamp(22px, 3.4vw, 34px);
  background: var(--pitch-800);
  color: var(--cream-50);
  overflow: hidden;
}

.page-about .range-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(114deg, transparent 0 22px, rgba(200, 255, 61, .055) 22px 23px);
  pointer-events: none;
}

.page-about .range-band__cell {
  position: relative;
  z-index: 1;
}

.page-about .range-band__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--lime-400);
  font-variant-numeric: tabular-nums;
}

.page-about .range-band__txt {
  margin: 6px 0 0;
  max-width: 26ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(251, 248, 239, .74);
}

/* 团队分工 */
.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .crew__cell {
  padding: 22px 20px;
  background: var(--cream-100);
  border-top: 2px solid var(--pitch-600);
}

.page-about .crew__cell--lead {
  background: var(--pitch-800);
  color: var(--cream-50);
  border-top-color: var(--lime-400);
}

.page-about .crew__num {
  display: block;
  font-family: var(--font-data);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--pitch-800);
  font-variant-numeric: tabular-nums;
}

.page-about .crew__cell--lead .crew__num {
  color: var(--lime-400);
}

.page-about .crew__role {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -.01em;
  color: inherit;
}

.page-about .crew__txt {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #3b3830;
}

.page-about .crew__cell--lead .crew__txt {
  color: rgba(251, 248, 239, .8);
}

/* 版本时间线 */
.page-about .timeline {
  position: relative;
  margin-top: clamp(20px, 3vw, 28px);
  padding-left: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--pitch-600), var(--lime-400));
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 2px var(--cream-50), 0 0 0 3px var(--pitch-600);
}

.page-about .tl-item > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 11px 0;
  list-style: none;
  cursor: pointer;
}

.page-about .tl-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-item > summary::marker {
  content: "";
}

.page-about .tl-year {
  font-family: var(--font-data);
  font-size: 14.5px;
  letter-spacing: .02em;
  color: var(--signal-orange-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--charcoal-900);
  transition: color .2s var(--ease);
}

.page-about .tl-item > summary:hover .tl-title,
.page-about .tl-item > summary:focus-visible .tl-title,
.page-about .tl-item[open] > summary .tl-title {
  color: var(--pitch-600);
}

.page-about .tl-body {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: #3b3830;
}

/* 原则引文 */
.page-about .creed {
  margin: clamp(20px, 3vw, 28px) 0;
  padding: clamp(22px, 3.6vw, 34px) clamp(20px, 3.2vw, 32px);
  background: var(--cream-100);
  border-left: 3px solid var(--signal-orange);
}

.page-about .creed p {
  margin: 0 0 14px;
  max-width: none;
  font-family: var(--font-editorial);
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--ink-brown);
}

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

/* 结尾入口 */
.page-about .about-cta {
  padding-block: clamp(38px, 6vw, 72px);
  background: var(--pitch-950);
  color: var(--cream-50);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(251, 248, 239, .78);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-stats li + li {
    padding-left: 18px;
    border-left: 1px solid rgba(251, 248, 239, .14);
  }

  .page-about .range-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .crew {
    grid-template-columns: 1.5fr 1fr 1fr;
    align-items: stretch;
  }

  .page-about .step-list {
    grid-template-columns: 1fr 1fr;
    column-gap: 34px;
  }
}

@media (min-width: 940px) {
  .page-about .about-layout {
    grid-template-columns: 212px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--frame) + 86px);
    align-self: start;
  }

  .page-about .about-index ol {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
    border-bottom: 0;
  }

  .page-about .about-index__title {
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
  }

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

  .page-about .about-chapter h2 {
    max-width: 22em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .tl-title {
    transition: none;
  }
}
<<<PAGE_CSS_DONE>>>