.page-about {
  --about-text: #C3CCE2;
  padding-bottom: clamp(40px, 6vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 2.4vw, 28px);
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .about-lede-inner {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

@media (min-width: 980px) {
  .page-about .about-lede-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }
}

.page-about .lede-main .eyebrow {
  margin: 0 0 16px;
}

.page-about .about-lede h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5.2vw, 62px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0;
  max-width: 16em;
}

.page-about .head-stamp {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .head-stamp li {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 6px 12px;
  white-space: nowrap;
}

.page-about .head-stamp li:first-child {
  color: var(--cyan);
  border-color: rgba(36, 224, 210, 0.45);
}

.page-about .lede-side .lead {
  color: var(--about-text);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  margin: 0;
}

.page-about .lede-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 开篇整宽图带 ---------- */
.page-about .about-band {
  margin: clamp(36px, 5vw, 72px) auto 0;
  max-width: var(--maxw);
  padding-inline: var(--pad-x);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* ---------- 左侧目录 + 正文骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(40px, 6vw, 80px);
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
  }
}

.page-about .toc-rail {
  align-self: start;
}

@media (min-width: 1024px) {
  .page-about .toc-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

.page-about .toc-rail ol {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 1024px) {
  .page-about .toc-rail ol {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }
}

.page-about .toc-link {
  display: block;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  outline: none;
}

@media (min-width: 1024px) {
  .page-about .toc-link {
    position: relative;
    padding: 7px 0 7px 14px;
    border: 0;
    white-space: normal;
  }
  .page-about .toc-link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 2px;
    bottom: 2px;
    width: 2px;
    background: transparent;
    transition: background 0.18s var(--ease);
  }
  .page-about .toc-link:hover::before,
  .page-about .toc-link:focus-visible::before {
    background: var(--cyan);
  }
}

.page-about .about-body {
  min-width: 0;
  max-width: 920px;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(34px, 5vw, 72px);
  border-top: 1px solid var(--line);
}

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

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .sec-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0;
}

.page-about .about-sec > p {
  max-width: 62ch;
  margin: 0 0 18px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-text);
}

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

.page-about .about-sec strong {
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 版本号拆解 ---------- */
.page-about .ver__segs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .ver__segs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ver__seg {
  position: relative;
  background: var(--panel);
  padding: 22px 22px 24px;
}

.page-about .ver__seg::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--line);
}

.page-about .ver__seg--active::before {
  background: var(--cyan);
}

.page-about .ver__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--muted);
}

.page-about .ver__seg--active .ver__num {
  color: var(--cyan);
}

.page-about .ver__key {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--paper);
}

.page-about .ver__desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 通用图注图 ---------- */
.page-about .about-fig {
  margin: clamp(24px, 3vw, 38px) 0 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.page-about .about-fig figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 四步流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .flow__item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .flow__item::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 46px;
  bottom: -1px;
  width: 1px;
  background: var(--line);
}

.page-about .flow__item:last-child::after {
  display: none;
}

.page-about .flow__no {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--cyan);
  border: 1px solid rgba(36, 224, 210, 0.5);
  background: var(--ink);
}

.page-about .flow__body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 4px 0 8px;
}

.page-about .flow__body p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 团队岗位 ---------- */
.page-about .roles {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .roles li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .roles li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .roles__k {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .roles__v {
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 时间线 ---------- */
.page-about .epoch {
  list-style: none;
  margin: 0;
  padding: 6px 0 0 clamp(20px, 3vw, 34px);
  border-left: 1px solid var(--line);
  display: grid;
  gap: 26px;
}

.page-about .epoch__item {
  position: relative;
}

.page-about .epoch__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(20px, 3vw, 34px) - 4px);
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-about .epoch__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .epoch__text {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 入库检查清单 ---------- */
.page-about .checks {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 clamp(22px, 3vw, 32px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .checks__item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  background: var(--panel);
}

.page-about .checks__dot {
  width: 8px;
  height: 8px;
  margin-top: 7px;
  background: var(--moss);
  box-shadow: 0 0 0 3px rgba(63, 163, 122, 0.18);
}

.page-about .checks__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .checks__item p {
  margin: 6px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(36px, 5vw, 68px);
  padding: clamp(26px, 4vw, 52px);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, #141C46 0%, #0A1030 78%);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--violet), var(--cyan));
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 700;
  line-height: 1.16;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 16px);
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

@media (max-width: 620px) {
  .page-about .head-stamp li {
    font-size: 11px;
    padding: 5px 10px;
  }
  .page-about .flow__item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
  }
  .page-about .checks__item {
    padding: 16px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link,
  .page-about .toc-link::before {
    transition: none;
  }
}
<<<END>>>