.page-about {
  --about-grid-line: rgba(169, 199, 189, .12);
  --about-panel-bg: rgba(7, 16, 13, .34);
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

/* 首屏框景 */
.page-about .about-hero {
  padding-top: clamp(16px, 2.5vw, 28px);
}

.page-about .about-frame {
  position: relative;
  border: 1px solid var(--hair);
  background:
    linear-gradient(155deg, rgba(28, 68, 55, .88) 0%, rgba(11, 43, 34, .94) 58%, rgba(7, 16, 13, .96) 100%);
  box-shadow: var(--shadow);
  padding: clamp(26px, 4.5vw, 56px) clamp(20px, 4vw, 56px) clamp(30px, 5vw, 60px);
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  left: -1px;
  right: -1px;
  height: 10px;
  background-image: repeating-linear-gradient(90deg, var(--mint) 0 1px, transparent 1px 22px);
  opacity: .45;
  pointer-events: none;
}

.page-about .about-frame::before {
  top: -11px;
}

.page-about .about-frame::after {
  bottom: -11px;
}

.page-about .about-frame__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(16px, 2.5vw, 26px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mono-gray);
  text-transform: uppercase;
}

.page-about .about-frame__dot {
  width: 8px;
  height: 8px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.page-about .about-hero__body {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 54px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--bone);
  max-width: 22ch;
}

.page-about .about-hero__lead {
  margin: 0 0 14px;
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.78;
  color: rgba(242, 239, 230, .88);
  max-width: 62ch;
}

.page-about .about-hero__lead--sub {
  color: var(--mint);
  font-size: 16px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

/* 首屏事实条 */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--hair-soft);
  border: 1px solid var(--hair);
}

.page-about .about-facts__item {
  background: var(--about-panel-bg);
  padding: 14px 16px 16px;
}

.page-about .about-facts__item dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mono-gray);
}

.page-about .about-facts__item dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

/* 章节筛选条 */
.page-about .about-index {
  margin-top: clamp(28px, 4vw, 44px);
  padding-bottom: clamp(18px, 2.4vw, 26px);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-index__hint {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--mono-gray);
  font-family: var(--font-mono);
}

/* 起点章节 */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(242, 239, 230, .86);
  max-width: 66ch;
}

.page-about .about-origin__figure {
  margin: 0;
  border: 1px solid var(--hair);
  background: var(--about-panel-bg);
  padding: 10px;
}

.page-about .about-origin__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92);
}

/* 三层结构 */
.page-about .about-layers__grid {
  grid-auto-rows: minmax(0, auto);
}

.page-about .about-layers__note {
  align-self: start;
}

.page-about .about-layers__note .panel__body p {
  margin: 0;
}

/* 校验流程 */
.page-about .verify-flow__scroll {
  overflow-x: auto;
  margin-bottom: clamp(24px, 3vw, 36px);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--hair-soft);
}

.page-about .verify-flow {
  display: block;
  width: 100%;
  min-width: 600px;
  height: auto;
}

.page-about .verify-flow rect {
  fill: rgba(7, 16, 13, .55);
  stroke: var(--mint);
  stroke-width: 1;
  transition: stroke .18s var(--ease), fill .18s var(--ease);
}

.page-about .verify-flow text {
  fill: var(--bone);
  font-family: var(--font-body);
  font-size: 15px;
  text-anchor: middle;
  dominant-baseline: middle;
}

.page-about .verify-flow .vf-b rect {
  stroke: var(--cyan);
}

.page-about .verify-flow .vf-c rect {
  stroke: var(--orange);
}

.page-about .verify-flow g:hover rect {
  fill: rgba(255, 122, 47, .1);
  stroke: var(--orange);
}

.page-about .verify-flow .vf-arrow {
  stroke: var(--mono-gray);
  stroke-width: 1.5;
}

.page-about .about-verify__grid {
  align-items: start;
}

.page-about .about-verify__grid .panel__body p {
  margin: 0 0 12px;
}

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

/* 发布时间清单 */
.page-about .about-timing {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-timing li {
  display: grid;
  gap: 2px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-timing__k {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timing__v {
  font-size: 15px;
  color: rgba(242, 239, 230, .86);
}

/* 覆盖范围带 */
.page-about .about-bandwrap {
  margin: clamp(36px, 6vw, 76px) 0;
}

.page-about .about-bandwrap__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 30px);
  letter-spacing: -.01em;
  color: var(--bone);
}

.page-about .about-band {
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  background:
    linear-gradient(90deg, rgba(28, 68, 55, .78), rgba(7, 16, 13, .6)),
    repeating-linear-gradient(90deg, var(--about-grid-line) 0 1px, transparent 1px 48px);
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 176px;
  padding: clamp(18px, 2.6vw, 30px) 0;
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-band__item:nth-child(4) .about-band__num {
  color: var(--orange);
}

.page-about .about-band__lbl {
  font-size: 14px;
  color: var(--bone);
}

.page-about .about-band__sub {
  font-size: 12px;
  color: var(--mono-gray);
}

.page-about .about-band__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mono-gray);
  max-width: 68ch;
}

/* 纵向时间线 */
.page-about .mission-line {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 34px;
}

.page-about .mission-line::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 224, 200, .16));
}

.page-about .mission-line__item {
  position: relative;
  padding-left: 34px;
}

.page-about .mission-line__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  background: var(--green-900);
  border: 2px solid var(--cyan);
}

.page-about .mission-line__item--current::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 47, .18);
}

.page-about .mission-line__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .mission-line__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .mission-line__item--current .mission-line__year {
  color: var(--orange);
}

.page-about .mission-line__note {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mono-gray);
}

.page-about .mission-line__panel .panel__body p {
  margin: 0;
}

/* 团队排班 */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--hair);
  background: var(--about-panel-bg);
  padding: 10px;
}

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

.page-about .about-team__text p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(242, 239, 230, .86);
  max-width: 66ch;
}

.page-about .about-table-wrap {
  overflow-x: auto;
  margin-top: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--hair);
  background: var(--about-panel-bg);
}

.page-about .about-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
}

.page-about .about-table caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px 10px;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--mono-gray);
}

.page-about .about-table th {
  font-size: 13px;
  font-weight: 600;
  color: var(--mint);
  text-align: left;
}

.page-about .about-table td {
  font-size: 14px;
  color: rgba(242, 239, 230, .88);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:nth-child(even) {
  background: rgba(7, 16, 13, .3);
}

/* 边界区块 */
.page-about .about-boundary__frame {
  position: relative;
  border: 1px solid rgba(255, 122, 47, .38);
  background: linear-gradient(180deg, rgba(28, 68, 55, .5), rgba(7, 16, 13, .55));
  padding: clamp(24px, 3.6vw, 44px);
}

.page-about .about-boundary__frame::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 48px;
  height: 4px;
  background: var(--orange);
}

.page-about .about-boundary__list {
  list-style: none;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-boundary__list li {
  position: relative;
  padding-left: 26px;
  font-size: 16px;
  line-height: 1.72;
  color: rgba(242, 239, 230, .88);
  max-width: 70ch;
}

.page-about .about-boundary__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 12px;
  height: 2px;
  background: var(--clay);
}

/* 结尾 */
.page-about .about-close__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-close__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 239, 230, .86);
  max-width: 66ch;
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding-top: 6px;
}

.page-about .about-close__links a {
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, .4);
  padding-bottom: 2px;
}

.page-about .about-close__links a:hover,
.page-about .about-close__links a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-close__figure {
  margin: 0;
  border: 1px solid var(--hair);
  background: var(--about-panel-bg);
  padding: 10px;
}

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

/* 图片与链接基础行为 */
.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about a {
  color: var(--cyan);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-close__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* 桌面端：非对称分栏与居中的纵向时间线 */
@media (min-width: 1024px) {
  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }
}

@media (min-width: 960px) {
  .page-about .mission-line::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .mission-line__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: clamp(40px, 5vw, 72px);
    padding-left: 0;
  }

  .page-about .mission-line__item::before {
    left: 50%;
    top: 24px;
    margin-left: -8px;
  }

  .page-about .mission-line__item:nth-child(odd) .mission-line__panel {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .mission-line__item:nth-child(odd) .mission-line__meta {
    grid-column: 2;
    grid-row: 1;
    justify-content: flex-start;
    padding-left: clamp(24px, 3vw, 40px);
    margin-top: 14px;
    margin-bottom: 0;
  }

  .page-about .mission-line__item:nth-child(even) .mission-line__panel {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .mission-line__item:nth-child(even) .mission-line__meta {
    grid-column: 1;
    grid-row: 1;
    justify-content: flex-end;
    padding-right: clamp(24px, 3vw, 40px);
    margin-top: 14px;
    margin-bottom: 0;
  }
}

/* 降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .verify-flow rect,
  .page-about .about-close__links a {
    transition: none;
  }
}
<<<END>>>
</main>