.page-about {
  background: var(--ink-night);
  color: var(--white);
  overflow-x: hidden;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 4vw, 36px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  color: var(--mist);
}
.page-about .crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .crumbs li + li::before {
  content: "/";
  color: rgba(143, 169, 162, 0.6);
}
.page-about .crumbs a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(18px, 4vw, 32px) 0 0;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% auto -20%;
  height: 70%;
  z-index: -1;
  background:
    radial-gradient(circle at 22% 0%, rgba(0, 240, 200, 0.16), transparent 58%),
    radial-gradient(circle at 82% 16%, rgba(255, 176, 32, 0.11), transparent 52%);
  pointer-events: none;
}
.page-about .hero-core {
  max-width: 940px;
  margin: 0 auto;
  text-align: center;
}
.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  letter-spacing: 0.24em;
  color: var(--cyan);
}
.page-about .display-1 {
  margin: 0 0 clamp(16px, 3vw, 24px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-1);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}
.page-about .lede {
  margin: 0 auto;
  max-width: 720px;
  font-size: var(--fs-4);
  line-height: 1.8;
  color: var(--mist);
}

/* 纵向注释带 */
.page-about .about-annotations {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .ann {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 10px;
  padding: 14px 12px;
  border-left: 1px solid var(--line-soft);
}
.page-about .ann:first-child {
  border-left: none;
}
.page-about .ann-num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}
.page-about .ann-label {
  font-size: var(--fs-5);
  color: var(--mist);
  letter-spacing: 0.04em;
}

@media (min-width: 720px) {
  .page-about .about-annotations {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .ann {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    min-height: 158px;
    padding: 18px 16px;
  }
  .page-about .ann-label {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.16em;
    line-height: 1.2;
  }
}

/* 首屏图 */
.page-about .hero-figure {
  margin: clamp(28px, 5vw, 52px) 0 0;
}
.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-index {
  display: flex;
  gap: 10px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-bottom: 12px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}
.page-about .chapter-index a {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  letter-spacing: 0.05em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: color 140ms var(--ease), background 140ms var(--ease), border-color 140ms var(--ease);
}
.page-about .chapter-index a:hover,
.page-about .chapter-index a:focus-visible {
  color: var(--ink-night);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(38px, 6vw, 76px) 0;
  scroll-margin-top: 96px;
}
.page-about .about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: -4%;
  right: -4%;
  height: 2px;
  background: linear-gradient(
    90deg,
    rgba(0, 240, 200, 0) 0%,
    var(--cyan) 20%,
    rgba(0, 240, 200, 0.18) 64%,
    rgba(0, 240, 200, 0) 100%
  );
  transform: rotate(-0.9deg);
  transform-origin: left center;
}
.page-about .chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 3vw, 22px);
}
.page-about .chapter-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}
.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  letter-spacing: 0.12em;
  color: var(--amber);
}
.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-3);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--white);
}

@media (min-width: 900px) {
  .page-about .chapter-grid {
    grid-template-columns: 78px minmax(0, 1fr);
    column-gap: clamp(28px, 5vw, 64px);
    align-items: start;
  }
  .page-about .chapter-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-left: 14px;
    border-left: 1px solid var(--line-strong);
  }
  .page-about .chapter-title {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: clamp(19px, 1.5vw, 23px);
    line-height: 1.2;
    letter-spacing: 0.14em;
  }
  .page-about .chapter-body {
    padding-top: clamp(4px, 1.4vw, 18px);
    padding-left: clamp(0px, 2vw, 28px);
  }
}

.page-about .chapter-body {
  max-width: 70ch;
}
.page-about .chapter-body--wide {
  max-width: none;
}

/* ---------- 正文 ---------- */
.page-about .prose {
  margin: 0 0 1.1em;
  font-size: var(--fs-4);
  line-height: 1.8;
  color: var(--white);
}
.page-about .prose:last-child {
  margin-bottom: 0;
}
.page-about .prose a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 255, 228, 0.4);
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}
.page-about .prose a:hover,
.page-about .prose a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}
.page-about .stat {
  font-family: var(--font-mono);
  font-size: 1.08em;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ---------- 同步时段 ---------- */
.page-about .sync {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .sync li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  font-size: var(--fs-5);
  color: var(--mist);
  background: var(--board-deep);
  border-left: 2px solid var(--line-strong);
}
.page-about .sync-time {
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  color: var(--cyan);
  letter-spacing: 0.04em;
}
@media (min-width: 720px) {
  .page-about .sync {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .sync li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 14px 16px;
  }
}

/* ---------- 分组矩阵 ---------- */
.page-about .team-matrix {
  margin: clamp(22px, 4vw, 34px) 0 0;
}
.page-about .team-matrix svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 660px;
  overflow: visible;
}
.page-about .tm-group {
  transform-box: fill-box;
  transform-origin: center;
  transition: transform 200ms var(--ease);
  cursor: default;
}
.page-about .tm-group rect {
  fill: var(--board-deep);
  stroke: var(--line-strong);
  stroke-width: 1;
  transition: fill 160ms var(--ease), stroke 160ms var(--ease), stroke-width 160ms var(--ease);
}
.page-about .tm-group:hover rect {
  fill: var(--board-lift);
  stroke: var(--amber);
  stroke-width: 2;
}
.page-about .tm-name {
  fill: var(--white);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}
.page-about .tm-count {
  fill: var(--cyan);
  font-family: var(--font-mono);
  font-size: 19px;
}
.page-about .tm-group:hover .tm-count {
  fill: var(--amber);
}
@media (min-width: 900px) {
  .page-about .tm-group:hover {
    transform: scale(1.035);
  }
}
.page-about .media-caption {
  margin: 12px 0 0;
  font-size: var(--fs-5);
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .teams-figure {
  display: flex;
  justify-content: flex-end;
  margin: clamp(20px, 4vw, 32px) 0 0;
}
.page-about .teams-figure img {
  display: block;
  width: min(100%, 560px);
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
}
.page-about .flow-figure {
  display: flex;
  justify-content: flex-end;
  margin: clamp(24px, 4vw, 36px) 0 0;
}
.page-about .flow-figure img {
  display: block;
  width: min(100%, 380px);
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

/* ---------- 链路步骤 ---------- */
.page-about .flow {
  margin: clamp(20px, 4vw, 30px) 0 0;
  padding: 0 0 0 56px;
  list-style: none;
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  border-left: 1px solid var(--line-strong);
}
.page-about .flow li {
  position: relative;
}
.page-about .flow-num {
  position: absolute;
  left: -56px;
  top: -2px;
  width: 48px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--amber);
}
.page-about .flow-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--cyan-soft);
}
.page-about .flow p {
  margin: 0;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 规则折叠 ---------- */
.page-about .rule-book {
  margin: clamp(20px, 3vw, 28px) 0 0;
  background: var(--board-deep);
  border: 1px solid var(--line);
  border-left: 2px solid var(--amber);
}
.page-about .rule-book summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 44px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  letter-spacing: 0.05em;
  color: var(--cyan-soft);
  transition: background 140ms var(--ease), color 140ms var(--ease);
}
.page-about .rule-book summary::-webkit-details-marker {
  display: none;
}
.page-about .rule-book summary::after {
  content: "+";
  font-size: 18px;
  line-height: 1;
  color: var(--amber);
}
.page-about .rule-book[open] summary::after {
  content: "–";
}
.page-about .rule-book summary:hover,
.page-about .rule-book summary:focus-visible {
  background: var(--board-lift);
  color: var(--white);
  outline: none;
}
.page-about .rule-book summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan);
}
.page-about .rule-list {
  margin: 0;
  padding: 4px 18px 18px;
  list-style: none;
  display: grid;
  gap: 14px;
}
.page-about .rule-list li {
  padding-top: 12px;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}
.page-about .rule-stage {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  letter-spacing: 0.06em;
  color: var(--amber);
}

/* ---------- 信任数据 ---------- */
.page-about .trust-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(22px, 4vw, 32px) 0 0;
}
.page-about .trust-item {
  padding: 16px 16px 16px 18px;
  background: linear-gradient(90deg, rgba(18, 63, 53, 0.9), rgba(18, 63, 53, 0) 78%);
  border-left: 2px solid var(--line-strong);
}
.page-about .trust-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.05;
  color: var(--cyan);
  letter-spacing: -0.01em;
}
.page-about .trust-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-5);
  line-height: 1.7;
  color: var(--mist);
}
@media (min-width: 640px) {
  .page-about .trust-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 结尾色带 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 6vw, 72px);
  padding: clamp(28px, 5vw, 52px) 0;
  background: var(--amber);
  color: var(--ink-night);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}
.page-about .cta-inner {
  max-width: 900px;
}
.page-about .cta-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-3);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-night);
}
.page-about .cta-copy {
  margin: 0;
  font-size: var(--fs-4);
  line-height: 1.8;
  color: rgba(6, 17, 15, 0.86);
}
.page-about .cta-copy a {
  color: var(--ink-night);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(6, 17, 15, 0.45);
  transition: border-color 120ms var(--ease), color 120ms var(--ease);
}
.page-about .cta-copy a:hover,
.page-about .cta-copy a:focus-visible {
  color: #06110f;
  border-bottom-color: var(--board-lift);
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tm-group,
  .page-about .tm-group rect,
  .page-about .chapter-index a,
  .page-about .rule-book summary,
  .page-about .prose a,
  .page-about .crumbs a,
  .page-about .cta-copy a {
    transition: none;
  }
  .page-about .tm-group:hover {
    transform: none;
  }
}
<<<END>>>