.page-about {
  background: var(--sea);
  color: var(--ink);
  font-family: var(--ff-body);
  line-height: 1.75;
  padding-bottom: 72px;
}

.page-about .about-shell {
  padding-top: 18px;
}

.page-about .crumbs {
  margin: 0 0 20px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  border: 2px solid var(--line);
  background: linear-gradient(158deg, var(--panel-1) 0%, var(--sea) 72%);
  box-shadow: var(--shadow-hard);
  margin-bottom: 44px;
}

.page-about .hero-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 2px solid var(--line);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

.page-about .hero-bar__line {
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}

.page-about .hero-grid {
  display: grid;
}

.page-about .hero-copy {
  padding: 24px 20px 28px;
}

.page-about .hero-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .hero-title {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(31px, 7.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  margin: 14px 0 18px;
  max-width: 16ch;
}

.page-about .hero-lead {
  margin: 0 0 12px;
  color: var(--ink-dim);
  font-size: 16px;
  max-width: 56ch;
}

.page-about .hero-lead--sub {
  color: var(--ink);
  font-size: 15px;
  border-left: 2px solid var(--heat);
  padding-left: 12px;
}

.page-about .hero-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .hero-facts li {
  background: var(--panel-1);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .hero-facts li:last-child {
  grid-column: span 2;
}

.page-about .hero-facts__num {
  font-family: var(--ff-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-facts__unit {
  font-size: 14px;
  margin-left: 2px;
  color: var(--mint);
}

.page-about .hero-facts__label {
  font-size: 12px;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
}

.page-about .hero-fig {
  margin: 0;
  position: relative;
  border-top: 2px solid var(--line);
  background: var(--panel-2);
}

.page-about .hero-fig__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .hero-fig__cap {
  display: block;
  padding: 8px 14px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  border-top: 1px solid var(--line-soft);
  text-transform: uppercase;
}

/* ---------- 双栏文档骨架 ---------- */
.page-about .doc-layout {
  display: grid;
  gap: 6px;
}

.page-about .doc-index {
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  padding: 10px 0;
  margin-bottom: 10px;
}

.page-about .doc-index__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--heat);
}

.page-about .doc-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .doc-index__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 10px;
  min-height: 40px;
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  border-left: 2px solid transparent;
  transition: color 0.18s, background 0.18s, border-color 0.18s;
}

.page-about .doc-index__link:hover,
.page-about .doc-index__link.is-current {
  color: var(--ink);
  background: var(--panel-2);
  border-left-color: var(--cyan);
}

.page-about .doc-index__num {
  font-size: 11px;
  color: var(--heat);
  letter-spacing: 0.1em;
}

/* ---------- 章节 ---------- */
.page-about .zone {
  padding: 30px 0 34px;
}

.page-about .zone + .zone {
  border-top: 1px solid var(--line-soft);
}

.page-about .zone__head {
  margin-bottom: 24px;
}

.page-about .zone__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--heat);
  border: 1px solid var(--heat);
  padding: 1px 7px;
  margin-bottom: 12px;
}

.page-about .zone__title {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(23px, 4.6vw, 37px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  max-width: 22ch;
}

.page-about .zone__note {
  margin: 0;
  color: var(--ink-dim);
  font-size: 14px;
  max-width: 58ch;
  border-left: 2px solid var(--mint);
  padding-left: 12px;
}

/* ---------- 01 矩阵结构 ---------- */
.page-about .matrix-wrap {
  border: 2px solid var(--line);
  background: var(--panel-1);
  box-shadow: var(--shadow-hard);
  padding: 6px;
  margin-bottom: 22px;
}

.page-about .matrix-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .m-links {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.4;
  opacity: 0.55;
}

.page-about .m-node__box {
  fill: var(--panel-2);
  stroke: var(--steel);
  stroke-width: 2;
  transition: fill 0.18s, stroke 0.18s;
}

.page-about .m-node__label {
  fill: var(--ink);
  font-family: var(--ff-body);
  font-size: 19px;
  font-weight: 700;
  text-anchor: middle;
}

.page-about .m-node__idx {
  fill: var(--ink-dim);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-anchor: middle;
}

.page-about .m-node--hub .m-node__box {
  fill: var(--cyan);
  stroke: var(--cyan);
}

.page-about .m-node--hub .m-node__label {
  fill: var(--sea);
  font-family: var(--ff-display);
  font-size: 26px;
  font-weight: 900;
}

.page-about .m-node--hub .m-node__idx {
  fill: rgba(4, 16, 26, 0.72);
}

.page-about .m-node:hover .m-node__box {
  stroke: var(--heat);
  fill: rgba(43, 232, 200, 0.14);
}

.page-about .m-node--hub:hover .m-node__box {
  fill: var(--mint);
  stroke: var(--mint);
}

.page-about .matrix-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .matrix-item {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 10px;
  background: var(--panel-1);
  padding: 14px 16px;
  border-left: 3px solid transparent;
  transition: border-color 0.18s, transform 0.18s, background 0.18s;
}

.page-about .matrix-item:hover {
  border-left-color: var(--cyan);
  background: var(--panel-2);
  transform: translateY(-2px);
}

.page-about .matrix-item__idx {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.1em;
  padding-top: 2px;
}

.page-about .matrix-item__name {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .matrix-item__text {
  margin: 0 0 8px;
  font-size: 13.5px;
  color: var(--ink-dim);
}

.page-about .matrix-item__go {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 255, 217, 0.4);
  padding-bottom: 1px;
}

.page-about .matrix-item__go:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .matrix-item__go--self {
  color: var(--ink-dim);
  border-bottom-color: transparent;
}

/* ---------- 02 生产流程 ---------- */
.page-about .flow-layout {
  display: grid;
  gap: 20px;
}

.page-about .flow-fig {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .flow-fig__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .flow-fig__cap {
  display: block;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  border-top: 1px solid var(--line-soft);
  text-transform: uppercase;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .flow__step {
  border-left: 2px solid var(--steel);
  padding: 2px 0 2px 16px;
  transition: border-color 0.18s;
}

.page-about .flow__step:hover {
  border-left-color: var(--cyan);
}

.page-about .flow__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--heat);
}

.page-about .flow__step h3 {
  margin: 3px 0 4px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-dim);
}

.page-about .flow-note {
  margin: 22px 0 0;
  padding: 12px 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 4px solid var(--heat);
  font-size: 14px;
  color: var(--ink);
}

/* ---------- 03 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--steel));
}

.page-about .tl__item {
  position: relative;
  margin-bottom: 10px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 16px;
  width: 9px;
  height: 9px;
  background: var(--sea);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .tl__details {
  background: var(--panel-1);
  border: 1px solid var(--line-soft);
}

.page-about .tl__details[open] {
  border-color: var(--line);
  background: var(--panel-2);
}

.page-about .tl__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  min-height: 48px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__year {
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  font-weight: 700;
}

.page-about .tl__label {
  flex: 1;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .tl__mark {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--heat);
  border-bottom: 2px solid var(--heat);
  transform: rotate(45deg);
  transition: transform 0.22s;
  flex: 0 0 auto;
}

.page-about .tl__details[open] .tl__mark {
  transform: rotate(-135deg);
}

.page-about .tl__body {
  padding: 12px 14px 14px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .tl__body p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-dim);
}

/* ---------- 04 团队 ---------- */
.page-about .team {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 2px solid var(--line);
  background: var(--panel-1);
  padding: 16px;
  box-shadow: var(--shadow-hard);
}

.page-about .team-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.page-about .team-card__idx {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint);
}

.page-about .team-card__num {
  font-size: 12px;
  color: var(--heat);
  border: 1px solid rgba(255, 90, 54, 0.5);
  padding: 0 6px;
}

.page-about .team-card__head {
  margin: 2px 0 0;
  font-family: var(--ff-display);
  font-size: 20px;
  font-weight: 700;
}

.page-about .team-card__text {
  margin: 0;
  font-size: 13.5px;
  color: var(--ink-dim);
}

.page-about .team-foot {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--ink-dim);
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
  max-width: 66ch;
}

/* ---------- 05 地域合作 ---------- */
.page-about .geo-layout {
  display: grid;
  gap: 22px;
}

.page-about .geo-copy > p {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--ink-dim);
}

.page-about .geo-points {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .geo-points li {
  font-size: 14px;
  color: var(--ink-dim);
  border-left: 2px solid var(--steel);
  padding-left: 12px;
}

.page-about .geo-points strong {
  display: block;
  color: var(--ink);
  font-size: 14.5px;
}

.page-about .geo-note {
  font-size: 14px;
  color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line);
  padding: 12px 14px;
  margin: 0;
}

.page-about .geo-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 200, 0.5);
}

.page-about .geo-note a:hover {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about .geo-strip {
  list-style: none;
  margin: 18px 0 0;
  padding: 8px 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .geo-strip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .geo-strip li {
  flex: 0 0 auto;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 7px 14px;
  border: 1px solid var(--line-soft);
  color: var(--ink-dim);
}

.page-about .geo-strip li.is-active {
  color: var(--sea);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-about .geo-fig {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .geo-fig__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .geo-fig__cap {
  display: block;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  border-top: 1px solid var(--line-soft);
  text-transform: uppercase;
}

/* ---------- 06 成果 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .honor {
  background: var(--panel-1);
  padding: 20px;
}

.page-about .honor__num {
  display: block;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .honor__num small {
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-dim);
  margin-left: 4px;
  letter-spacing: 0.04em;
}

.page-about .honor__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  padding: 2px 8px;
  border: 1px solid var(--violet);
  color: var(--violet);
}

.page-about .honor__label {
  margin: 10px 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .honor__text {
  margin: 0;
  font-size: 13.5px;
  color: var(--ink-dim);
}

/* ---------- 07 内容标准 ---------- */
.page-about .std-grid {
  display: grid;
  gap: 14px;
}

.page-about .std {
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  background: var(--panel-1);
  padding: 16px;
}

.page-about .std:nth-child(2) {
  border-top-color: var(--mint);
}

.page-about .std:nth-child(3) {
  border-top-color: var(--heat);
}

.page-about .std:nth-child(4) {
  border-top-color: var(--violet);
}

.page-about .std__ruler {
  height: 16px;
  border-bottom: 1px solid var(--steel);
  background-image: repeating-linear-gradient(90deg, var(--steel) 0 1px, transparent 1px 9px);
  background-repeat: repeat-x;
  background-position: bottom left;
  background-size: 9px 8px;
  margin-bottom: 14px;
}

.page-about .std__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .std__text {
  margin: 0;
  font-size: 13.5px;
  color: var(--ink-dim);
}

/* ---------- 下一步 ---------- */
.page-about .next-panel {
  margin-top: 18px;
  border: 2px solid var(--line);
  background: linear-gradient(132deg, var(--panel-2) 0%, var(--panel-1) 60%, var(--sea) 100%);
  box-shadow: var(--shadow-cyan);
  padding: 24px 20px;
}

.page-about .next-panel__title {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(21px, 3.6vw, 28px);
  margin: 0 0 10px;
  line-height: 1.25;
}

.page-about .next-panel__text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-dim);
  max-width: 62ch;
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .next-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 2px solid var(--cyan);
  color: var(--cyan);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: var(--cyan);
  color: var(--sea);
}

.page-about .next-link--solid {
  background: var(--cyan);
  color: var(--sea);
}

.page-about .next-link--solid:hover,
.page-about .next-link--solid:focus-visible {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--sea);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .hero-copy {
    padding: 32px 30px 34px;
  }

  .page-about .hero-facts {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .hero-facts li:last-child {
    grid-column: auto;
  }

  .page-about .matrix-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .std-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .next-panel {
    padding: 30px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    padding-top: 26px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.14fr) minmax(0, 0.86fr);
  }

  .page-about .hero-fig {
    border-top: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .hero-fig__img {
    height: 100%;
    aspect-ratio: auto;
    min-height: 420px;
  }

  .page-about .doc-layout {
    grid-template-columns: 234px minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .doc-index {
    position: sticky;
    top: 88px;
    margin-bottom: 0;
    padding: 16px 14px;
    border: 2px solid var(--line);
    background: var(--panel-1);
    box-shadow: var(--shadow-hard);
  }

  .page-about .doc-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .doc-index__link {
    width: 100%;
    white-space: normal;
  }

  .page-about .zone {
    padding: 36px 0 44px;
  }

  .page-about .flow-layout {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .geo-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.88fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .team-card:nth-child(even) {
    transform: translateY(14px);
  }

  .page-about .std-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .next-panel {
    padding: 36px 34px;
    margin-top: 26px;
  }
}

@media (min-width: 1100px) {
  .page-about .hero-copy {
    padding: 42px 44px 46px;
  }

  .page-about .zone__title {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .matrix-item,
  .page-about .tl__mark,
  .page-about .next-link,
  .page-about .doc-index__link {
    transition: none;
  }

  .page-about .matrix-item:hover {
    transform: none;
  }
}
<<<END>>>