.page-about {
  --about-soft-line: color-mix(in srgb, var(--line) 72%, transparent);
  --about-text-soft: color-mix(in srgb, var(--bone) 82%, transparent);
  padding-block: 20px 72px;
  color: var(--bone);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .breadcrumb {
  margin-bottom: 8px;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  padding-block: 12px 8px;
}

.page-about .about-cover__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-cover__lead .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-cover__lead .display-title {
  margin: 0;
  max-width: 18em;
}

.page-about .about-cover__intro {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--about-text-soft);
}

.page-about .about-cover__stat {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 24px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-cover__stat .num {
  font-size: 20px;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-cover__divider {
  display: inline-block;
  width: 1px;
  height: 16px;
  background: var(--line);
  margin-inline: 6px;
}

.page-about .about-cover__index {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-cover__index-title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--violet);
}

.page-about .index-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-panel);
  color: var(--bone);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .index-card:hover,
.page-about .index-card:focus-visible {
  border-color: var(--cyan);
  background: color-mix(in srgb, var(--bg-panel) 90%, var(--cyan));
  transform: translateX(3px);
}

.page-about .index-card__no {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 2px;
}

.page-about .index-card__body {
  display: grid;
  gap: 4px;
  font-size: 15px;
  line-height: 1.6;
  min-width: 0;
}

.page-about .index-card__body strong {
  font-size: 16px;
  font-weight: 700;
}

.page-about .index-card__body span {
  color: var(--grey);
  font-size: 14px;
  line-height: 1.65;
}

/* ---------- 结论段 ---------- */
.page-about .about-thesis {
  margin-block: 56px 72px;
}

.page-about .about-thesis__lead {
  margin: 20px 0 0;
  max-width: 760px;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.2vw, 32px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--bone);
}

.page-about .about-thesis__cols {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  max-width: 900px;
}

.page-about .about-thesis__cols p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-block: 80px;
  padding-block: 48px;
  border-block: 1px solid var(--about-soft-line);
  overflow: hidden;
}

.page-about .about-timeline__backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .15;
  filter: grayscale(.35);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-timeline__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-text-soft);
  max-width: 32em;
}

.page-about .timeline {
  list-style: none;
  margin: 36px 0 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  padding-bottom: 22px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--line);
  box-sizing: content-box;
}

.page-about .timeline__item.is-done::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline__item.is-current::before {
  background: var(--orange);
  border-color: var(--orange);
  animation: about-pulse 2.4s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 122, 47, .38); }
  50% { box-shadow: 0 0 0 7px rgba(255, 122, 47, 0); }
}

.page-about .timeline__year {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .timeline__item.is-current .timeline__year {
  color: var(--orange);
}

.page-about .timeline__fold {
  flex: 1 1 260px;
  min-width: 0;
}

.page-about .timeline__fold summary {
  cursor: pointer;
  font-size: 16px;
  line-height: 1.6;
  color: var(--bone);
}

.page-about .timeline__fold .fold__body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text-soft);
  max-width: 46em;
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  margin-block: 72px;
  padding-block: 40px;
  border-block: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(53, 240, 208, .11), rgba(143, 123, 255, .10) 54%, rgba(11, 31, 25, 0) 92%),
    var(--bg-panel);
}

.page-about .about-band__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
}

.page-about .about-band__item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding-left: 14px;
  border-left: 2px solid color-mix(in srgb, var(--cyan) 55%, transparent);
}

.page-about .about-band__num {
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-band__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-block: 80px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-team__figure {
  margin: 0;
}

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

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--grey);
}

.page-about .about-team__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .source-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .source-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--bg-panel) 72%, transparent);
  font-size: 15px;
  line-height: 1.6;
}

.page-about .source-list strong {
  font-weight: 700;
  color: var(--bone);
}

.page-about .source-list li > span:last-child {
  color: var(--grey);
}

.page-about .split {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .split__col {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--violet);
  border-radius: var(--radius-md);
  background: var(--bg-panel);
}

.page-about .split__col + .split__col {
  border-left-color: var(--orange);
}

.page-about .split__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--grey);
}

.page-about .split__kicker .num {
  font-size: 18px;
  color: var(--bone);
}

.page-about .split__col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

/* ---------- 交付标准 ---------- */
.page-about .about-standard {
  margin-block: 80px;
}

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

.page-about .about-standard__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .standard-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .standard-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .standard-list li:first-child {
  border-top: 1px dashed var(--line);
}

.page-about .standard-list__num {
  flex: 0 0 auto;
  min-width: 74px;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--orange);
}

.page-about .standard-list__num small {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--grey);
}

.page-about .standard-list li > div {
  min-width: 0;
}

.page-about .standard-list strong {
  display: block;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-about .standard-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .about-standard__foot {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--yellow);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: color-mix(in srgb, var(--bg-panel) 74%, transparent);
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .about-standard__figure {
  margin: 0;
}

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

/* ---------- 协作网络 ---------- */
.page-about .about-network {
  margin-block: 80px;
}

.page-about .about-network__lede {
  margin: 16px 0 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .network-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .network-node {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .network-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .network-node__label {
  display: block;
  margin-top: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .network-node__desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 2026 计划 ---------- */
.page-about .about-plan {
  margin-block: 80px;
}

.page-about .plan-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .plan-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--bg-panel) 84%, var(--violet));
}

.page-about .plan-list__no {
  flex: 0 0 auto;
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--violet);
  padding-top: 3px;
}

.page-about .plan-list li > div {
  min-width: 0;
}

.page-about .plan-list strong {
  display: block;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-about .plan-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  margin-block: 80px 0;
}

.page-about .about-close__panel {
  padding: 28px 24px;
}

.page-about .about-close__text {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-close__actions .btn {
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-thesis__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-band__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-band {
    padding-block: 48px;
  }

  .page-about .about-close__panel {
    padding: 40px;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-block: 28px 96px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-standard__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-standard__figure {
    position: sticky;
    top: calc(var(--header-h) + 16px);
  }

  .page-about .timeline {
    padding-left: 32px;
  }

  .page-about .timeline__item::before {
    left: -40px;
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .network-node__desc {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
  }

  .page-about .network-node:hover,
  .page-about .network-node:focus {
    border-color: var(--violet);
  }

  .page-about .network-node:hover .network-node__desc,
  .page-about .network-node:focus .network-node__desc {
    max-height: 140px;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item.is-current::before {
    animation: none;
  }

  .page-about .index-card,
  .page-about .network-node,
  .page-about .network-node__desc {
    transition: none;
  }

  .page-about .index-card:hover,
  .page-about .index-card:focus-visible {
    transform: none;
  }
}
<<<END>>>