.page-about {
  background: var(--void);
  color: var(--text);
  padding-bottom: clamp(40px, 6vw, 80px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0 6px;
  font-size: 0.8125rem;
  color: var(--mist);
}
.page-about .crumbs__link {
  color: var(--mist);
  text-decoration: none;
}
.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  color: var(--cyan);
}
.page-about .crumbs__sep {
  color: var(--line);
}
.page-about .crumbs__now {
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(14px, 2.4vw, 28px) 0 clamp(18px, 3vw, 34px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.28;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(120% 80% at 12% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(120% 80% at 12% 0%, #000 0%, transparent 78%);
}
.page-about .hero-frame {
  position: relative;
  padding: clamp(26px, 4.4vw, 58px) clamp(18px, 3.4vw, 52px);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(15, 26, 46, 0.92), rgba(7, 11, 20, 0.86));
  border-left: 3px solid var(--cyan);
}
.page-about .hero-kicker {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .hero-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--text);
  max-width: 20ch;
}
.page-about .hero-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.75;
  color: var(--mist);
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 值班台式信息带 ---------- */
.page-about .metric-strip {
  list-style: none;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.page-about .metric-strip > li {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 18px 14px 20px;
  text-decoration: none;
  color: inherit;
  position: relative;
  background: linear-gradient(180deg, rgba(15, 26, 46, 0.5), rgba(7, 11, 20, 0.2));
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.page-about .metric:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}
.page-about .metric:hover {
  background: linear-gradient(180deg, rgba(28, 44, 70, 0.66), rgba(11, 19, 34, 0.6));
}
.page-about .metric::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.24s var(--ease);
}
.page-about .metric:hover::after,
.page-about .metric:focus-visible::after {
  transform: scaleX(1);
}
.page-about .metric__val {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .metric__unit {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--mist);
  line-height: 1.4;
}
.page-about .metric__key {
  margin-top: 6px;
  font-size: 0.9375rem;
  color: var(--text);
  letter-spacing: 0.02em;
}
.page-about .metric__go {
  margin-top: 4px;
  font-size: 0.8125rem;
  color: var(--cyan);
  opacity: 0;
  transform: translateY(3px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.page-about .metric:hover .metric__go,
.page-about .metric:focus-visible .metric__go {
  opacity: 1;
  transform: translateY(0);
}
.page-about .metric-strip > li:nth-child(2) .metric__val { color: var(--lime); }
.page-about .metric-strip > li:nth-child(2) .metric::after { background: var(--lime); }
.page-about .metric-strip > li:nth-child(2) .metric__go { color: var(--lime); }
.page-about .metric-strip > li:nth-child(3) .metric__val { color: var(--violet); }
.page-about .metric-strip > li:nth-child(3) .metric::after { background: var(--violet); }
.page-about .metric-strip > li:nth-child(3) .metric__go { color: var(--violet); }
.page-about .metric-strip > li:nth-child(4) .metric__val { color: var(--amber); }
.page-about .metric-strip > li:nth-child(4) .metric::after { background: var(--amber); }
.page-about .metric-strip > li:nth-child(4) .metric__go { color: var(--amber); }

/* ---------- 左轨 + 正文流 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: clamp(30px, 5vw, 56px);
}
.page-about .chapter-rail {
  display: none;
}
.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 6vw, 88px);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 132px;
  min-width: 0;
}
.page-about .about-sec .band {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}
.page-about .band__title {
  margin: 0;
}
.page-about .sec-lede {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 64ch;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 奶油纸面长文 ---------- */
.page-about .about-paper {
  position: relative;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--paper-line);
  border-left: 4px solid var(--coral);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 40px) clamp(18px, 2.8vw, 40px);
  max-width: 70ch;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.page-about .about-paper:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}
.page-about .about-paper p {
  margin: 0 0 1.2em;
  font-size: 1rem;
  line-height: 1.8;
}
.page-about .about-paper p:last-child {
  margin-bottom: 0;
}
.page-about .about-paper blockquote {
  margin: 1.4em 0;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--coral);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}
.page-about .about-paper--tight {
  margin-top: clamp(18px, 2.6vw, 30px);
}
.page-about .about-paper a {
  color: var(--coral);
}

/* ---------- 四类客群 ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .role-card {
  background: var(--panel-2);
  padding: clamp(18px, 2.4vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background 0.2s var(--ease);
}
.page-about .role-card:hover {
  background: var(--panel);
}
.page-about .role-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text);
}
.page-about .role-card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .role-card__note {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--cyan) !important;
}

/* ---------- 团队 ---------- */
.page-about .team-media {
  margin-bottom: clamp(20px, 3vw, 34px);
}
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}
.page-about .team-copy p {
  margin: 0 0 1.1em;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .team-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-content: start;
}
.page-about .team-facts .stat {
  background: var(--panel-2);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 44px;
}
.page-about .team-facts .stat__val {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}
.page-about .team-facts .stat__key {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--mist);
}
.page-about .team-facts .stat--cyan .stat__val { color: var(--cyan); }
.page-about .team-facts .stat--violet .stat__val { color: var(--violet); }
.page-about .team-facts .stat--lime .stat__val { color: var(--lime); }
.page-about .team-facts .stat--orange .stat__val { color: var(--orange); }

/* ---------- 四步方法 ---------- */
.page-about .flow-media {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}
.page-about .fold-stack {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .fold-stack .fold {
  background: var(--panel);
  border: 0;
}
.page-about .fold-stack .fold__sum {
  cursor: pointer;
  padding: 16px 18px;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--text);
  list-style: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.page-about .fold-stack .fold__sum::-webkit-details-marker {
  display: none;
}
.page-about .fold-stack .fold__sum:hover {
  background: rgba(33, 243, 208, 0.06);
  color: var(--cyan);
}
.page-about .fold-stack .fold__sum:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}
.page-about .fold-stack .fold__mark {
  color: var(--lime);
  font-size: 0.875rem;
}
.page-about .fold-stack .fold__body {
  padding: 0 18px 20px 46px;
}
.page-about .fold-stack .fold__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--mist);
}
.page-about .fold-stack .fold[open] .fold__sum {
  color: var(--cyan);
}

/* ---------- 合作与认可 ---------- */
.page-about .recog-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .recog-item {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  padding: clamp(16px, 2.4vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}
.page-about .recog-item__val {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}
.page-about .recog-item:nth-child(2) .recog-item__val { color: var(--orange); }
.page-about .recog-item:nth-child(3) .recog-item__val { color: var(--cyan); }
.page-about .recog-item:nth-child(4) .recog-item__val { color: var(--violet); }
.page-about .recog-item__key {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 发展节点 ---------- */
.page-about .timeline-media {
  margin-bottom: clamp(20px, 3vw, 34px);
}
.page-about .evt-line {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
}
.page-about .evt-line::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--cyan) 45%, var(--violet));
}
.page-about .evt {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
}
.page-about .evt:last-child {
  padding-bottom: 0;
}
.page-about .evt::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--cyan);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .evt:hover::before,
.page-about .evt:focus-within::before {
  transform: scale(1.34);
  border-color: var(--lime);
  box-shadow: 0 0 0 5px rgba(33, 243, 208, 0.16);
}
.page-about .evt__year {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  line-height: 1.1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}
.page-about .evt__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text);
}
.page-about .evt__text p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 收尾联系带 ---------- */
.page-about .about-sec--last {
  padding-bottom: 8px;
}
.page-about .cta-band {
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(255, 92, 43, 0.14), transparent 60%),
    linear-gradient(180deg, var(--panel), var(--panel-2));
  padding: clamp(22px, 3.4vw, 44px);
}
.page-about .cta-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
}
.page-about .path-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: rgba(7, 11, 20, 0.55);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.page-about .path-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.4);
}
.page-about .path-card--ghost {
  border-left-color: var(--cyan);
}
.page-about .path-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--text);
}
.page-about .path-card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .path-card__meta {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--amber) !important;
}
.page-about .path-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

.page-about .contact-line {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .contact-line__row {
  background: rgba(7, 11, 20, 0.6);
  padding: 12px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  min-height: 44px;
}
.page-about .contact-line__key {
  flex: 0 0 auto;
  min-width: 76px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.page-about .contact-line__val {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text);
  overflow-wrap: anywhere;
}
.page-about .contact-line__val a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 243, 208, 0.4);
}
.page-about .contact-line__val a:hover,
.page-about .contact-line__val a:focus-visible {
  color: var(--cyan-deep);
  border-bottom-color: var(--cyan-deep);
}
.page-about .cta-foot {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .cta-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 243, 208, 0.4);
  margin: 0 2px;
}
.page-about .cta-foot a:hover,
.page-about .cta-foot a:focus-visible {
  color: var(--cyan-deep);
}

/* ---------- 图片容器兜底 ---------- */
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.03);
}
.page-about .media-frame--4x3 img {
  aspect-ratio: 4 / 3;
}
.page-about .media-frame--16x9 img {
  aspect-ratio: 16 / 9;
}
.page-about .media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--void);
  background: var(--amber);
}

/* ---------- 焦点环 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--void), 0 0 0 4px var(--cyan);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .team-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .recog-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .cta-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .contact-line {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 72px);
  }
  .page-about .chapter-rail {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: sticky;
    top: 136px;
    align-self: start;
    border-left: 1px solid var(--line);
    padding-left: 14px;
  }
  .page-about .chapter-link {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding: 6px 8px;
    font-size: 0.9375rem;
    color: var(--mist);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -15px;
    padding-left: 16px;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
  }
  .page-about .chapter-link .data-num {
    font-family: var(--font-data);
    font-size: 0.75rem;
    color: var(--line);
  }
  .page-about .chapter-link:hover,
  .page-about .chapter-link:focus-visible {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: rgba(33, 243, 208, 0.05);
  }
  .page-about .chapter-link:hover .data-num {
    color: var(--cyan);
  }
  .page-about .chapter-link[aria-current="true"] {
    color: var(--cyan);
    border-left-color: var(--cyan);
  }
  .page-about .chapter-link[aria-current="true"] .data-num {
    color: var(--cyan);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .team-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .metric-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .role-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .metric,
  .page-about .metric::after,
  .page-about .metric__go,
  .page-about .about-paper,
  .page-about .role-card,
  .page-about .evt::before,
  .page-about .path-card,
  .page-about .fold-stack .fold__sum,
  .page-about .chapter-link {
    transition: none !important;
  }
  .page-about .about-paper:hover,
  .page-about .path-card:hover {
    transform: none;
  }
}
<<<END>>>