.page-about {
  --about-axis: rgba(233, 185, 73, 0.42);
  --about-axis-soft: rgba(233, 185, 73, 0.1);
  --about-glow: rgba(233, 185, 73, 0.14);
  --about-card: rgba(18, 34, 74, 0.72);
  --about-deep: rgba(10, 22, 51, 0.92);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 52px) 0 clamp(56px, 8vw, 104px);
  background:
    radial-gradient(120% 88% at 86% -12%, rgba(30, 49, 99, 0.92), transparent 62%),
    radial-gradient(70% 60% at 8% 110%, rgba(127, 216, 192, 0.09), transparent 60%),
    var(--ink-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(142, 155, 181, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(142, 155, 181, 0.07) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 78%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__grid {
  margin-top: clamp(28px, 5vw, 56px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(40px, 8.4vw, 94px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--cloud);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--ash);
}

.page-about .about-hero__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .fact {
  padding: 16px 14px;
  background: var(--about-card);
}

.page-about .fact__label {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ash);
}

.page-about .fact__value {
  margin: 6px 0 0;
  font-size: clamp(17px, 2.2vw, 22px);
  color: var(--cloud);
}

.page-about .fact__value .num {
  color: var(--gold);
  font-size: 1.28em;
}

.page-about .about-hero__slant {
  position: absolute;
  right: -8%;
  bottom: -34px;
  width: 52%;
  height: 90px;
  background: linear-gradient(90deg, transparent, rgba(233, 185, 73, 0.16));
  z-index: 1;
  pointer-events: none;
}

/* ---------- 通用区块头 ---------- */

.page-about .about-head {
  max-width: 68ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-head .h-section {
  margin: 12px 0 0;
}

.page-about .about-head .lede {
  margin-top: 14px;
}

.page-about .about-prose p {
  color: var(--ash);
}

.page-about .about-prose p:first-child {
  color: var(--cloud);
}

/* ---------- 起点区块 ---------- */

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

.page-about .about-origin__aside {
  margin-top: 8px;
}

.page-about .about-aside-card {
  background: var(--about-card);
}

.page-about .about-mini {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-mini__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  justify-content: space-between;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-mini__row:last-child {
  border-bottom: 0;
}

.page-about .about-mini__key {
  font-size: 13px;
  color: var(--ash);
}

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

.page-about .about-mini__val.num {
  color: var(--gold);
}

/* ---------- 版本演进 ---------- */

.page-about .about-versions__figure {
  margin: 0 0 clamp(32px, 6vw, 64px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-axis) 0%, var(--about-axis-soft) 55%, rgba(127, 216, 192, 0.36) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-left: 56px;
  padding-bottom: 26px;
  outline: none;
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__dot {
  position: absolute;
  left: 15px;
  top: 21px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--ink-900);
  box-shadow: 0 0 0 4px var(--about-axis-soft);
  transition: background 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .tl__card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-card);
  padding: 18px 18px 16px;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .tl__item:hover .tl__card,
.page-about .tl__item:focus-within .tl__card,
.page-about .tl__item:focus .tl__card {
  transform: translateY(-2px);
  border-color: rgba(233, 185, 73, 0.6);
  box-shadow: 0 10px 26px rgba(4, 10, 26, 0.5);
}

.page-about .tl__item:hover .tl__dot,
.page-about .tl__item:focus .tl__dot {
  background: var(--gold);
  box-shadow: 0 0 0 5px var(--about-glow);
}

.page-about .tl__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.35;
  color: var(--cloud);
}

.page-about .tl__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ash);
}

.page-about .tl__more {
  margin: 0;
  max-height: 8em;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(142, 155, 181, 0.78);
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
  margin-top: 12px;
  opacity: 1;
  transition: opacity 160ms var(--ease), margin-top 160ms var(--ease), padding-top 160ms var(--ease);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  align-items: start;
  margin-bottom: clamp(26px, 4vw, 46px);
}

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

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .team-card {
  background: var(--about-card);
  display: flex;
  flex-direction: column;
}

.page-about .team-card__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--cloud);
}

.page-about .team-card .panel__body {
  flex: 1 1 auto;
}

.page-about .team-card .panel__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .team-card__note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .team-card:hover .team-card__note,
.page-about .team-card:focus-within .team-card__note {
  transform: translateY(-4px);
  border-color: rgba(233, 185, 73, 0.34);
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .coverage-map__figure {
  margin: 0;
}

.page-about .coverage-cities .kicker {
  display: block;
  margin: 0 0 14px;
}

.page-about .cities {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 10px;
}

.page-about .city {
  position: relative;
  padding: 11px 12px 11px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-card);
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .city__dot {
  position: absolute;
  left: 12px;
  top: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 0 4px rgba(127, 216, 192, 0.12);
  transition: box-shadow 160ms var(--ease), background 160ms var(--ease);
}

.page-about .city__name {
  display: block;
  font-size: 15px;
  color: var(--cloud);
}

.page-about .city__meta {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ash);
  opacity: 0.66;
  transition: opacity 160ms var(--ease), color 160ms var(--ease);
}

.page-about .city:hover,
.page-about .city:focus-within {
  transform: translateY(-2px);
  border-color: rgba(233, 185, 73, 0.55);
}

.page-about .city:hover .city__meta,
.page-about .city:focus-within .city__meta {
  opacity: 1;
  color: var(--cloud);
}

.page-about .city:hover .city__dot {
  background: var(--gold-soft);
  box-shadow: 0 0 0 5px var(--about-glow);
}

.page-about .coverage-stats {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .coverage-stat {
  padding: 14px;
  background: var(--about-card);
}

.page-about .coverage-stat__value {
  display: block;
  font-size: clamp(22px, 3.4vw, 30px);
  color: var(--gold);
}

.page-about .coverage-stat__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ash);
}

/* ---------- 社群与专题 ---------- */

.page-about .about-community__facts {
  margin: 0 0 clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .fact--inline {
  padding: 14px 16px;
  background: var(--about-card);
}

.page-about .fact--inline .fact__value {
  margin-top: 6px;
  font-size: 15px;
}

.page-about .fact--inline .fact__value .num {
  font-size: 1.5em;
}

.page-about .about-community__kicker {
  display: block;
  margin: 0 0 14px;
}

.page-about .year-strip {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-strip::-webkit-scrollbar {
  height: 6px;
}

.page-about .year-strip::-webkit-scrollbar-thumb {
  background: rgba(233, 185, 73, 0.35);
  border-radius: 3px;
}

.page-about .year-card {
  flex: 0 0 clamp(238px, 72vw, 292px);
  scroll-snap-align: start;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(30, 49, 99, 0.75), rgba(18, 34, 74, 0.55));
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .year-card:hover {
  transform: translateY(-3px);
  border-color: rgba(233, 185, 73, 0.6);
}

.page-about .year-card__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .year-card__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 21px;
  color: var(--cloud);
}

.page-about .year-card__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ash);
}

/* ---------- 下一步 ---------- */

.page-about .about-next__panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(233, 185, 73, 0.12), transparent 62%),
    var(--about-card);
  padding: clamp(22px, 4vw, 44px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-next__text {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
}

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

.page-about .about-next__link {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  background: rgba(10, 22, 51, 0.5);
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .about-next__link-title {
  display: block;
  font-size: 16px;
  color: var(--cloud);
}

.page-about .about-next__link-meta {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  color: var(--ash);
}

/* ---------- 中屏 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 14px;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 68px;
  }

  .page-about .about-community__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-next__links {
    grid-template-columns: 1fr;
  }
}

/* ---------- 桌面：轴线居中，面板左右交错 ---------- */

@media (min-width: 900px) {
  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-origin__aside {
    margin-top: 96px;
  }

  .page-about .tl::before {
    left: 50%;
  }

  .page-about .tl__item {
    width: 46%;
    padding-left: 0;
    padding-bottom: 34px;
  }

  .page-about .tl__item:nth-child(odd) {
    margin-left: 0;
    margin-right: auto;
    text-align: right;
  }

  .page-about .tl__item:nth-child(even) {
    margin-left: 54%;
    text-align: left;
  }

  .page-about .tl__item:nth-child(odd) .tl__dot {
    left: auto;
    right: -8.7%;
    transform: translateX(50%);
  }

  .page-about .tl__item:nth-child(even) .tl__dot {
    right: auto;
    left: -8.7%;
    transform: translateX(-50%);
  }

  .page-about .tl__item:nth-child(odd) .tl__more {
    text-align: right;
  }

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

/* ---------- 悬停可用的桌面：时间轴摘要收起，交互后展开 ---------- */

@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .page-about .tl__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 220ms var(--ease), opacity 180ms var(--ease), margin-top 220ms var(--ease), padding-top 220ms var(--ease);
  }

  .page-about .tl__item:hover .tl__more,
  .page-about .tl__item:focus .tl__more,
  .page-about .tl__item:focus-within .tl__more {
    max-height: 8em;
    opacity: 1;
    margin-top: 12px;
    padding-top: 10px;
    border-top-color: var(--line-soft);
  }
}

/* ---------- 窄屏收敛 ---------- */

@media (max-width: 480px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }

  .page-about .coverage-stats {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .cities {
    grid-template-columns: 1fr;
  }
}

/* ---------- 焦点可见 ---------- */

.page-about a:focus-visible,
.page-about .tl__item:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .tl__dot,
  .page-about .tl__more,
  .page-about .city,
  .page-about .year-card,
  .page-about .about-next__link,
  .page-about .team-card__note {
    transition: none;
  }
}
<<<END>>>