.page-about {
  --about-body: rgba(232, 241, 248, 0.8);
  --about-panel: rgba(18, 40, 60, 0.72);
  --about-hair: rgba(44, 66, 87, 0.85);
  display: block;
  overflow-x: hidden;
  color: var(--text);
  font-family: var(--font-body);
  background-color: var(--ink);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .ax-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .ax-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ax-media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 26px 0 40px;
  border-bottom: var(--rule);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(38, 227, 210, 0.11), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 122, 41, 0.07), transparent 62%),
    var(--ink);
}

.page-about .ax-crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ax-crumbs__link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .ax-crumbs__link:hover {
  color: var(--cyan);
}

.page-about .ax-crumbs__sep {
  color: var(--line);
}

.page-about .ax-crumbs__here {
  color: var(--text);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 20px;
}

.page-about .about-hero h1 {
  margin: 10px 0 14px;
  max-width: 15em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(29px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-hero__intro {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-keys {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-keys__item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding-top: 10px;
  border-top: 1px solid var(--about-hair);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-keys__dot {
  width: 7px;
  height: 7px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(38, 227, 210, 0.14);
}

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

.page-about .about-hero__figure .ax-media {
  aspect-ratio: 14 / 9;
}

/* ---------- 首屏刻度带 ---------- */

.page-about .about-scale {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-scale__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-scale__track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-scale__node {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 14px 14px 16px;
  border: 1px solid var(--about-hair);
  background: linear-gradient(180deg, rgba(18, 40, 60, 0.85), rgba(11, 27, 43, 0.9));
}

.page-about .about-scale__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  opacity: 0.6;
}

.page-about .about-scale__node:last-child::before {
  background: var(--orange);
  opacity: 1;
}

.page-about .about-scale__dot {
  position: absolute;
  left: -4px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-scale__node:last-child .about-scale__dot {
  background: var(--orange);
}

.page-about .about-scale__year {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-scale__node:last-child .about-scale__year {
  color: var(--orange);
}

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

/* ---------- 双栏骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 40px;
  padding-bottom: 56px;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-sect {
  padding: 38px 0 10px;
  border-top: 1px solid var(--line);
}

.page-about .about-sect:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sect h2 {
  margin: 10px 0 16px;
  max-width: 20em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 4vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .about-sect h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-copy {
  max-width: 62ch;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-inline-link {
  margin: 20px 0 0;
}

/* ---------- 演进图 ---------- */

.page-about .about-figure {
  margin: 24px 0 8px;
}

.page-about .about-figure .ax-media--wide {
  aspect-ratio: 12 / 7;
}

/* ---------- 竖向时间线 ---------- */

.page-about .about-tl {
  position: relative;
  margin-top: 26px;
  padding-left: 26px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(38, 227, 210, 0.06));
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .about-tl__mark {
  position: absolute;
  left: -26px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-tl__item:last-child .about-tl__mark {
  border-color: var(--orange);
}

.page-about .about-tl__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-tl__text {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 22px;
}

.page-about .about-bars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .about-bar {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 6px;
  min-height: 128px;
  padding: 14px 14px 16px;
  border: 1px solid var(--about-hair);
  background: linear-gradient(180deg, rgba(30, 27, 69, 0.5), rgba(11, 27, 43, 0.92));
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--cyan);
}

.page-about .about-bar--eng::after {
  background: var(--ok);
}

.page-about .about-bar--cs::after {
  background: var(--orange);
}

.page-about .about-bar:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.page-about .about-bar__name {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

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

.page-about .about-team__figure .ax-media--square {
  aspect-ratio: 1 / 1;
}

/* ---------- 一天的时间点 ---------- */

.page-about .about-day {
  margin-top: 30px;
}

.page-about .about-day__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.page-about .about-day__list {
  margin: 0;
  padding: 0;
}

.page-about .about-day__row {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-day__row dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-day__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .ax-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 内容来源 ---------- */

.page-about .about-sources {
  margin: 22px 0 26px;
}

.page-about .about-sources__bar {
  display: flex;
  height: 14px;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-sources__seg {
  display: block;
  height: 100%;
}

.page-about .about-sources__seg--data {
  flex: 26;
  background: linear-gradient(90deg, rgba(38, 227, 210, 0.85), rgba(38, 227, 210, 0.42));
}

.page-about .about-sources__seg--media {
  flex: 14;
  background: linear-gradient(90deg, rgba(255, 122, 41, 0.8), rgba(255, 122, 41, 0.38));
}

.page-about .about-sources__legend {
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-sources__key {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-sources__swatch {
  width: 12px;
  height: 12px;
  flex: 0 0 12px;
  border: 1px solid var(--line);
}

.page-about .about-sources__swatch--data {
  background: rgba(38, 227, 210, 0.7);
}

.page-about .about-sources__swatch--media {
  background: rgba(255, 122, 41, 0.7);
}

.page-about .about-pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-pair__card {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  background: var(--about-panel);
}

.page-about .about-pair__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
}

.page-about .about-pair__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 资质 ---------- */

.page-about .about-creds {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 8px;
}

.page-about .about-cred {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid var(--about-hair);
  background: linear-gradient(160deg, rgba(30, 27, 69, 0.62), rgba(11, 27, 43, 0.9));
}

.page-about .about-cred::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-cred__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-cred h3 {
  font-size: 17px;
}

.page-about .about-cred p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0 24px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid var(--about-hair);
  background: linear-gradient(180deg, rgba(14, 59, 63, 0.75), rgba(11, 27, 43, 0.9));
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

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

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  margin-top: 36px;
  padding: 30px 22px 26px;
  border: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 122, 41, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(18, 40, 60, 0.9), rgba(6, 13, 22, 0.95));
}

.page-about .about-cta h2 {
  margin: 10px 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.2;
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--about-hair);
  list-style: none;
}

.page-about .about-cta__links a {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-cta__links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about .about-scale__track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .page-about .about-scale__node {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

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

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

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

  .page-about .about-hero__intro {
    font-size: 17px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 34px 0 48px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 46px;
    align-items: start;
    margin-top: 26px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 20px;
    align-items: stretch;
  }

  .page-about .about-bars {
    grid-template-columns: 32fr 24fr 12fr;
    align-items: stretch;
  }

  .page-about .about-bar {
    min-height: 210px;
  }

  .page-about .about-day__row {
    grid-template-columns: 108px minmax(0, 1fr);
  }

  .page-about .about-cta {
    padding: 40px 34px 34px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    padding-top: 52px;
    padding-bottom: 72px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-sect {
    padding: 52px 0 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar,
  .page-about .about-cta__links a {
    transition: none;
  }

  .page-about .about-bar:hover {
    transform: none;
  }
}