.page-about {
  --about-rail: 136px;
  --about-line: rgba(242, 245, 251, .14);
  --about-muted: rgba(242, 245, 251, .78);
  display: block;
  background: var(--c-ink-900);
  color: var(--c-paper);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: clamp(32px, 6vw, 76px) 0 clamp(48px, 7vw, 96px);
  background:
    repeating-linear-gradient(112deg, rgba(245, 154, 24, .09) 0 2px, transparent 2px 26px),
    radial-gradient(120% 95% at 84% -12%, rgba(58, 42, 110, .92) 0%, rgba(58, 42, 110, 0) 62%),
    var(--c-ink-900);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-cover__crumbs {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-cover__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-cover__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 82px);
  line-height: 1.06;
  letter-spacing: -.02em;
  transform: skewX(-3deg);
  transform-origin: left center;
  color: var(--c-paper);
}

.page-about .about-cover__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 56ch;
  color: var(--about-muted);
}

.page-about .about-cover__actions {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-cover__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .fact {
  margin: 0;
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  background: rgba(20, 28, 54, .74);
}

.page-about .fact__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
}

.page-about .fact__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-tiger);
  font-variant-numeric: tabular-nums;
}

/* ---------- 通用图 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(34px, 5vw, 64px);
}

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

/* ---------- 八年历程 ---------- */
.page-about .journey {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .journey__index {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 0 0 10px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--c-line);
  scrollbar-width: none;
}

.page-about .journey__index::-webkit-scrollbar {
  display: none;
}

.page-about .journey__year {
  flex: 0 0 auto;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-mist);
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .journey__year:hover,
.page-about .journey__year:focus-visible {
  color: var(--c-tiger-lit);
  border-color: var(--c-tiger);
}

.page-about .journey__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(44px, 7vw, 92px);
}

.page-about .journey__stage {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--c-line);
}

.page-about .journey__stage::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--c-tiger);
  transform: translateX(-50%) rotate(45deg);
}

.page-about .journey__mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-signal);
}

.page-about .journey__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.28;
  color: var(--c-paper);
}

.page-about .journey__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .section--indigo {
  background-image:
    linear-gradient(rgba(242, 245, 251, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 245, 251, .045) 1px, transparent 1px),
    linear-gradient(180deg, #3A2A6E 0%, #291E50 100%);
  background-size: 44px 44px, 44px 44px, 100% 100%;
}

.page-about .version-rail {
  border-top: 1px solid var(--about-line);
}

.page-about .vnode {
  border-bottom: 1px solid var(--about-line);
  transition: background var(--t-base);
}

.page-about .vnode__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "no chev"
    "title chev";
  gap: 6px 14px;
  align-items: center;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .vnode__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-tiger);
}

.page-about .vnode__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.4;
  color: var(--c-paper);
}

.page-about .vnode__chev {
  grid-area: chev;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--c-tiger);
  border-bottom: 1px solid var(--c-tiger);
  transform: rotate(45deg);
  transition: transform var(--t-base);
}

.page-about .vnode[open] .vnode__chev {
  transform: rotate(225deg);
}

.page-about .vnode[open] .vnode__head {
  padding-bottom: 8px;
}

.page-about .vnode__body {
  padding: 0 4px 22px;
}

.page-about .vnode__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .vnode__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .vnode__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: 1px;
  background: var(--c-tiger-lit);
}

.page-about .vnode--now {
  background: linear-gradient(90deg, rgba(37, 224, 176, .14), rgba(37, 224, 176, 0) 72%);
  box-shadow: inset 2px 0 0 var(--c-signal);
}

.page-about .vnode--now .vnode__no {
  color: var(--c-signal);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
  align-items: start;
}

.page-about .team__dots {
  display: grid;
  gap: clamp(26px, 3.6vw, 40px);
}

.page-about .dotset__label {
  margin: 0 0 14px;
  font-size: 15px;
  color: var(--c-paper);
}

.page-about .dotset__count {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--c-tiger);
  margin: 0 2px;
}

.page-about .dotgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 12px);
  gap: 8px;
  max-width: 300px;
}

.page-about .dotgrid i {
  display: block;
  width: 12px;
  height: 12px;
  background: var(--c-tiger);
  opacity: .9;
}

.page-about .dotgrid--creators i {
  background: var(--c-signal);
  opacity: .82;
}

.page-about .dotset__note {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .team__facts {
  margin-top: clamp(34px, 5vw, 60px);
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .team__fact {
  padding: 20px 18px;
  background: rgba(10, 15, 31, .55);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .team__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 600;
  line-height: 1;
  color: var(--c-paper);
  font-variant-numeric: tabular-nums;
}

.page-about .team__fact-label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-mist);
}

/* ---------- 四类栏目 ---------- */
.page-about .columns-grid {
  display: grid;
  gap: 16px;
}

.page-about .col-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 32px);
  background: rgba(20, 28, 54, .9);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-tiger);
}

.page-about .col-card--b {
  border-top-color: var(--c-signal);
}

.page-about .col-card--c {
  border-top-color: #6E5ACF;
}

.page-about .col-card--d {
  border-top-color: var(--c-wine);
}

.page-about .col-card__tag {
  align-self: flex-start;
  margin: 0;
}

.page-about .col-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.36;
  color: var(--c-paper);
}

.page-about .col-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .col-card__for {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--c-line);
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--c-mist);
}

/* ---------- 实际结果 ---------- */
.page-about .gains {
  border-top: 1px solid var(--c-line);
}

.page-about .gain {
  display: grid;
  gap: 10px;
  padding: clamp(24px, 3vw, 38px) 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .gain__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1;
  color: var(--c-tiger);
  font-variant-numeric: tabular-nums;
}

.page-about .gain__head {
  display: block;
}

.page-about .gain__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.34;
  color: var(--c-paper);
}

.page-about .gain__text {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-muted);
}

/* ---------- 认可 ---------- */
.page-about .honor {
  display: grid;
  gap: clamp(30px, 5vw, 64px);
  align-items: center;
}

.page-about .honor__figure {
  display: flex;
  align-items: flex-end;
  gap: 16px;
}

.page-about .honor__num {
  font-family: var(--font-mono);
  font-size: clamp(96px, 20vw, 196px);
  font-weight: 600;
  line-height: .8;
  letter-spacing: -.04em;
  color: var(--c-tiger-lit);
  font-variant-numeric: tabular-nums;
}

.page-about .honor__unit {
  padding-bottom: 12px;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--c-paper);
}

.page-about .honor__text {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .honor__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .honor__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .honor__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .8em;
  width: 12px;
  height: 1px;
  background: var(--c-signal);
}

/* ---------- 尾部延伸 ---------- */
.page-about .about-next {
  display: grid;
  border-top: 1px solid var(--c-line);
}

.page-about .about-next__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-line);
  text-decoration: none;
  color: inherit;
  transition: padding-left var(--t-fast), background var(--t-fast);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  padding-left: 14px;
  background: rgba(245, 154, 24, .07);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--c-paper);
}

.page-about .about-next__text {
  grid-column: 1 / 2;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-next__arrow {
  grid-row: 1 / 3;
  grid-column: 2 / 3;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--c-tiger);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .team__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .columns-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .col-card--a {
    grid-column: span 7;
  }

  .page-about .col-card--b {
    grid-column: span 5;
  }

  .page-about .col-card--c {
    grid-column: span 5;
  }

  .page-about .col-card--d {
    grid-column: span 7;
  }

  .page-about .vnode__head {
    grid-template-columns: 104px minmax(0, 1fr) auto;
    grid-template-areas: "no title chev";
    align-items: baseline;
    gap: 0 24px;
    padding: 20px 4px;
  }

  .page-about .vnode__chev {
    align-self: center;
  }

  .page-about .vnode__body {
    padding-left: 132px;
  }

  .page-about .gain {
    grid-template-columns: 92px minmax(0, .9fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 30px;
  }

  .page-about .gain__no {
    padding-top: 4px;
  }
}

@media (min-width: 940px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .journey {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 96px);
  }

  .page-about .journey__index {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 20px;
    margin-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .journey__year {
    padding: 10px 12px;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -22px;
    padding-left: 20px;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .honor {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 1px solid var(--c-line);
  }

  .page-about .about-next__item {
    padding: 26px 24px;
    border-bottom: 1px solid var(--c-line);
    border-right: 1px solid var(--c-line);
  }

  .page-about .about-next__item:nth-child(2n) {
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cover__title {
    transform: none;
  }

  .page-about .vnode__chev,
  .page-about .about-next__item,
  .page-about .journey__year {
    transition: none;
  }
}