.page-about {
  background: var(--ink);
  color: var(--text);
  --about-edge: rgba(30, 70, 87, 0.72);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 22px 0 48px;
  border-bottom: 1px solid rgba(30, 70, 87, 0.5);
}

.page-about .hero-wave {
  position: absolute;
  left: -12%;
  right: -12%;
  bottom: -140px;
  height: 340px;
  pointer-events: none;
  background:
    radial-gradient(56% 100% at 26% 100%, rgba(53, 214, 176, 0.16), transparent 72%),
    radial-gradient(48% 100% at 78% 92%, rgba(255, 122, 47, 0.13), transparent 70%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(30, 70, 87, 0.32) 1px, transparent 1px),
    linear-gradient(0deg, rgba(30, 70, 87, 0.24) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: radial-gradient(70% 60% at 70% 30%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(70% 60% at 70% 30%, #000 0%, transparent 78%);
  opacity: 0.55;
}

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

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .crumbs-link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .crumbs-link:hover,
.page-about .crumbs-link:focus-visible {
  color: var(--orange-soft);
  border-color: var(--orange-soft);
  outline: none;
}

.page-about .crumbs-sep {
  color: rgba(156, 180, 190, 0.55);
}

.page-about .crumbs-current {
  color: var(--text);
}

.page-about .hero-grid {
  display: grid;
  gap: 32px;
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-size: var(--fs-13);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .hero-title {
  margin: 0;
  max-width: 16em;
  font-size: var(--fs-64);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .hero-lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-figs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  border: 1px solid var(--about-edge);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--line);
  align-self: start;
}

.page-about .hero-fig {
  padding: 18px 16px 20px;
  background: linear-gradient(170deg, rgba(18, 50, 67, 0.96), rgba(11, 36, 49, 0.96));
}

.page-about .hero-fig-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .hero-fig-unit {
  margin-left: 4px;
  font-size: var(--fs-13);
  letter-spacing: 0.02em;
  color: var(--orange-soft);
}

.page-about .hero-fig-label {
  margin: 8px 0 0;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节索引 ---------- */
.page-about .toc {
  display: none;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  position: relative;
  padding: 52px 0;
}

.page-about .section-head {
  max-width: 44em;
  margin-bottom: 30px;
}

.page-about .section-index {
  margin: 0 0 10px;
  font-size: var(--fs-13);
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .section-title {
  margin: 0;
  font-size: var(--fs-44);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.018em;
  color: var(--text);
}

.page-about .section-lede {
  margin: 14px 0 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .prose p {
  margin: 0 0 18px;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- 起点 ---------- */
.page-about .origin-split {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .origin-figure {
  margin: 0;
}

.page-about .media-frame {
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--about-edge);
  background: var(--deck);
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 编校分工 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 18px;
}

.page-about .team-card {
  padding: 24px 22px 22px;
  border: 1px solid var(--about-edge);
  border-radius: var(--r-card);
  background: linear-gradient(180deg, rgba(18, 50, 67, 0.92), rgba(11, 36, 49, 0.94));
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .team-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 122, 47, 0.5);
  box-shadow: 0 22px 40px -26px rgba(0, 0, 0, 0.95);
}

.page-about .team-kicker {
  margin: 0 0 12px;
  font-size: var(--fs-13);
  letter-spacing: 0.16em;
  color: rgba(156, 180, 190, 0.75);
}

.page-about .team-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--text);
}

.page-about .team-count {
  font-size: var(--fs-28);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .team-desc {
  margin: 12px 0 0;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .team-rhythm {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(30, 70, 87, 0.7);
  font-size: var(--fs-13);
  letter-spacing: 0.03em;
  color: var(--orange-soft);
}

.page-about .team-strip {
  margin-top: 18px;
  padding: 22px 22px;
  border: 1px dashed rgba(53, 214, 176, 0.38);
  border-radius: var(--r-card);
  background: rgba(6, 22, 31, 0.55);
}

.page-about .team-strip-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--text);
}

.page-about .team-strip-text {
  margin: 10px 0 0;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 版本路径 ---------- */
.page-about .version-illustration {
  margin: 0 0 34px;
}

.page-about .timeline {
  position: relative;
  padding-left: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(53, 214, 176, 0.8) 46%, rgba(30, 70, 87, 0.35) 100%);
}

.page-about .tl-node {
  position: relative;
  margin-bottom: 14px;
  border: 1px solid var(--about-edge);
  border-radius: var(--r-card);
  background: rgba(11, 36, 49, 0.78);
  transition: border-color 0.2s ease;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(6, 22, 31, 0.95);
}

.page-about .tl-node:hover {
  border-color: rgba(53, 214, 176, 0.42);
}

.page-about .tl-node--current {
  border-color: rgba(255, 122, 47, 0.55);
  background: linear-gradient(120deg, rgba(255, 122, 47, 0.09), rgba(11, 36, 49, 0.92) 46%);
}

.page-about .tl-node--current::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(6, 22, 31, 0.95), 0 0 18px rgba(255, 122, 47, 0.55);
}

.page-about .tl-node > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--r-card);
}

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

.page-about .tl-node > summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .tl-node > summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  color: var(--orange-soft);
}

.page-about .tl-node[open] > summary::after {
  content: "－";
}

.page-about .tl-mark {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .tl-title {
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

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

.page-about .tl-body p {
  margin: 0 0 12px;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- 覆盖与节奏 ---------- */
.page-about .cover-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .cover-item {
  display: grid;
  gap: 6px;
  padding: 22px 0;
  border-top: 1px solid rgba(30, 70, 87, 0.66);
}

.page-about .cover-item:last-child {
  border-bottom: 1px solid rgba(30, 70, 87, 0.66);
}

.page-about .cover-num {
  font-family: var(--font-mono);
  font-size: clamp(36px, 9vw, 52px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .cover-copy h3 {
  margin: 0 0 8px;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--text);
}

.page-about .cover-copy p {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 读者与场景 ---------- */
.page-about .scene-table {
  border: 1px solid var(--about-edge);
  border-radius: var(--r-card);
  overflow: hidden;
  background: rgba(11, 36, 49, 0.6);
}

.page-about .scene-head {
  display: none;
}

.page-about .scene-row {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border-top: 1px solid rgba(30, 70, 87, 0.55);
}

.page-about .scene-row:nth-child(2) {
  border-top: none;
}

.page-about .scene-when {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .scene-need {
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--text);
}

.page-about .scene-tool {
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--cyan);
}

.page-about .reader-illustration {
  margin: 30px 0 0;
}

/* ---------- 下一段 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 30px;
}

.page-about .next-copy .section-index {
  margin-bottom: 10px;
}

.page-about .next-text {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--about-edge);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--line);
  align-self: start;
}

.page-about .next-list li {
  padding: 16px 18px;
  background: rgba(18, 50, 67, 0.9);
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .next-list .mono {
  display: inline-block;
  min-width: 52px;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--orange-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 26px 0 62px;
  }

  .page-about .hero-figs {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .hero-fig {
    padding: 20px 16px 22px;
  }

  .page-about .section {
    padding: 64px 0;
  }

  .page-about .origin-split {
    grid-template-columns: 5fr 7fr;
    gap: 40px;
  }

  .page-about .team-grid {
    grid-template-columns: 1.18fr 1fr 0.86fr;
    gap: 22px;
  }

  .page-about .team-strip {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 26px;
    align-items: baseline;
    padding: 24px 26px;
  }

  .page-about .team-strip-text {
    margin: 0;
  }

  .page-about .cover-item {
    grid-template-columns: 210px 1fr;
    align-items: baseline;
    gap: 28px;
    padding: 26px 0;
  }

  .page-about .scene-head {
    display: grid;
    grid-template-columns: 150px 1.1fr 1fr;
    gap: 20px;
    padding: 14px 22px;
    background: rgba(30, 70, 87, 0.32);
    font-family: var(--font-mono);
    font-size: var(--fs-13);
    letter-spacing: 0.06em;
    color: var(--muted);
  }

  .page-about .scene-row {
    grid-template-columns: 150px 1.1fr 1fr;
    gap: 20px;
    align-items: baseline;
    padding: 20px 22px;
  }

  .page-about .next-grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: end;
  }

  .page-about .hero-title {
    font-size: var(--fs-88);
  }

  .page-about .hero-figs {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .origin-split {
    gap: 56px;
  }

  .page-about .team-grid {
    gap: 34px;
  }
}

@media (min-width: 1180px) {
  .page-about .toc {
    display: block;
    position: fixed;
    right: 22px;
    top: 50%;
    width: 132px;
    transform: translateY(-50%);
    z-index: 30;
  }

  .page-about .toc-title {
    margin: 0 0 10px;
    font-size: var(--fs-13);
    letter-spacing: 0.14em;
    color: rgba(156, 180, 190, 0.55);
  }

  .page-about .toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
    border-left: 1px solid rgba(30, 70, 87, 0.75);
  }

  .page-about .toc-link {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 6px 0 6px 12px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    font-size: var(--fs-13);
    line-height: 1.5;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.16s ease, border-color 0.16s ease;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible {
    color: var(--text);
    border-color: rgba(255, 178, 122, 0.6);
    outline: none;
  }

  .page-about .toc-link.is-active {
    color: var(--orange);
    border-color: var(--orange);
  }

  .page-about .toc-num {
    font-family: var(--font-mono);
    font-size: var(--fs-13);
    letter-spacing: 0.06em;
    color: rgba(156, 180, 190, 0.6);
  }

  .page-about .toc-link.is-active .toc-num {
    color: var(--orange-soft);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .tl-node,
  .page-about .toc-link,
  .page-about .crumbs-link {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>