.page-about {
  --about-radius: 6px;
  --about-lane: var(--cyan);
  display: block;
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 28px;
}

/* ---------- 小节标签 ---------- */
.page-about .about-eyebrow {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  padding-top: 8px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-lede__title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--sans);
  font-size: clamp(30px, 7.4vw, 54px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.02em;
}

.page-about .about-lede__sub {
  margin: 0 0 34px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .about-stat {
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-stat__label {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-stat__value {
  margin: 0;
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-size: 13px;
  color: var(--cyan);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 30px;
  padding-top: 56px;
  padding-bottom: 56px;
}

.page-about .about-origin__copy h2 {
  margin: 0 0 16px;
  max-width: 22ch;
  font-size: clamp(23px, 5vw, 34px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.02em;
}

.page-about .about-origin__copy p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-facts {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__k {
  flex: 0 0 58px;
  color: var(--cyan);
}

.page-about .about-facts__v {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-origin__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  overflow: hidden;
}

/* ---------- 通用小节标头 ---------- */
.page-about .about-head {
  padding-top: 52px;
  padding-bottom: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-head h2 {
  margin: 0 0 12px;
  max-width: 26ch;
  font-size: clamp(23px, 5.2vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.02em;
}

.page-about .about-head__note {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__chart {
  margin: 0 0 32px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-timeline__body {
  display: grid;
  gap: 24px;
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  color: var(--muted);
  text-decoration: none;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-rail__num {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
  transition: color .18s var(--ease);
}

.page-about .about-rail__item:hover .about-rail__num,
.page-about .about-rail__item:focus-visible .about-rail__num {
  color: var(--cyan);
}

.page-about .about-rail__year {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
}

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

.page-about .about-tl__node {
  position: relative;
  padding: 0 0 34px 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-tl__node:last-child {
  padding-bottom: 4px;
}

.page-about .about-tl__dot {
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .about-tl__meta {
  margin: 0 0 6px;
  color: var(--cyan);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.38;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tag {
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-800);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-tl__node:hover .about-tag,
.page-about .about-tl__node:focus-within .about-tag {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  padding-bottom: 52px;
}

.page-about .about-lane {
  --about-lane: var(--cyan);
  position: relative;
  padding: 20px 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-lane--edit {
  --about-lane: var(--orange);
}

.page-about .about-lane--tech {
  --about-lane: var(--sand);
}

.page-about .about-lane::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--about-lane);
}

.page-about .about-lane__head {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 10px;
}

.page-about .about-lane__idx {
  color: var(--muted);
}

.page-about .about-lane__title {
  flex: 1 1 auto;
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-lane__count {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-lane);
  font-variant-numeric: tabular-nums;
}

.page-about .about-lane__desc {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-lane__list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-lane__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-lane__list li:last-child {
  margin-bottom: 0;
}

.page-about .about-lane__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--about-lane);
}

/* ---------- 上架流程 ---------- */
.page-about .about-flow__body {
  display: grid;
  gap: 26px;
  padding-bottom: 52px;
}

.page-about .about-flow__figure {
  margin: 0;
  width: 100%;
  max-width: 340px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .about-flow__step {
  position: relative;
  padding: 0 0 24px 22px;
  border-left: 1px solid var(--line);
}

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

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .about-flow__num {
  display: block;
  margin-bottom: 6px;
  color: var(--cyan);
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources__grid {
  display: grid;
  gap: 14px;
  padding-bottom: 52px;
}

.page-about .about-src {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-src:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-src__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-src__unit {
  margin-left: 3px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-src h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-src p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 里程碑 ---------- */
.page-about .about-miles__list {
  margin: 0;
  padding: 0 0 52px;
  list-style: none;
}

.page-about .about-miles__item {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: 4px 18px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-miles__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-miles__year {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-miles__body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-miles__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  position: relative;
  margin-top: 8px;
  padding: 72px 0 60px;
  background: linear-gradient(135deg, rgba(34, 224, 214, .18), rgba(255, 122, 41, .14) 62%, rgba(255, 61, 127, .12));
  clip-path: polygon(0 12%, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-outro__k {
  margin: 0 0 12px;
  color: var(--paper);
  opacity: .78;
}

.page-about .about-outro__lead {
  margin: 0 0 26px;
  max-width: 34ch;
  font-size: clamp(21px, 4.6vw, 32px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-lede__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 768px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: 44px;
  }

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

  .page-about .about-flow__body {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-miles__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 6px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__body {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 6px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-rail__item {
    width: 100%;
  }

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