.page-about {
  display: block;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: 30px 0;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(0, 229, 255, 0.08) 0%, transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(18, 53, 40, 0.42) 0%, transparent 62%);
}

.page-about .about-hero__ghost {
  position: absolute;
  right: -2vw;
  top: -0.16em;
  font-family: var(--font-mono);
  font-size: clamp(120px, 26vw, 300px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: var(--paper);
  opacity: 0.035;
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-bottom: 52px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 8vw, 66px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  max-width: 540px;
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__facts div {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  display: flex;
  align-items: baseline;
  gap: 3px;
}

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

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
  aspect-ratio: 16 / 10;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.06);
}

/* ---------- 长文叙事行 ---------- */
.page-about .about-rows {
  position: relative;
}

.page-about .about-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding-block: 46px;
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
}

.page-about .about-rail__dot {
  width: 10px;
  height: 10px;
  flex: none;
  border-radius: 50%;
  background: var(--ink-950);
  border: 1px solid var(--cyan);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-row:hover .about-rail__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 5px var(--cyan-soft);
}

.page-about .about-rail__num {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-rail__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

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

.page-about .about-body h2 {
  margin: 0 0 18px;
  max-width: 20em;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-body p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-body > p:last-of-type {
  margin-bottom: 0;
}

/* ---------- 三道流程 ---------- */
.page-about .about-flow {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-flow__item {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

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

.page-about .about-flow__step {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-flow__item h3 {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 34px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure__cap {
  padding: 11px 15px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 团队参数 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 16px;
  background: var(--ink-900);
}

.page-about .about-stat--accent {
  grid-column: 1 / -1;
  background: var(--ink-800);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 62px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__num em {
  margin-left: 4px;
  font-style: normal;
  font-size: 0.3em;
  letter-spacing: 0;
  color: var(--mist);
}

.page-about .about-stat--accent .about-stat__num {
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 22px;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 1px solid var(--line);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-timeline__body h3 {
  margin: 6px 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 0 0 12px;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-quote {
  margin: 0;
  max-width: 30em;
  padding: 8px 0 8px 14px;
  border-left: 3px solid var(--rose);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-quote__tag {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--rose);
}

/* ---------- 正文内链 ---------- */
.page-about .about-body__link {
  margin-top: 22px;
  margin-bottom: 0;
}

.page-about .about-inline-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 24px;
  padding-block: 56px 72px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 900;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-cta__sub {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 章节指示点（仅宽屏） ---------- */
.page-about .about-dots {
  display: none;
}

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

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

  .page-about .about-stat--accent {
    grid-column: auto;
  }

  .page-about .about-figure--wide img {
    aspect-ratio: 2.2 / 1;
  }
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px;
  }

  .page-about .about-flow__item:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -34px;
    width: 34px;
    height: 1px;
    background: repeating-linear-gradient(90deg, var(--line) 0 5px, transparent 5px 10px);
    transition: background 0.2s var(--ease);
  }

  .page-about .about-flow__item:not(:last-child):hover::after {
    background: repeating-linear-gradient(90deg, var(--cyan) 0 5px, transparent 5px 10px);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-block: 40px 0;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 56px;
    padding-bottom: 68px;
  }

  .page-about .about-hero__figure {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 64px;
    padding-block: 64px;
  }

  .page-about .about-row::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(
      180deg,
      transparent 0,
      var(--line-soft) 64px,
      var(--line-soft) calc(100% - 64px),
      transparent 100%
    );
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    align-self: start;
    gap: 12px;
    position: sticky;
    top: 112px;
  }

  .page-about .about-rail__label {
    font-size: 12.5px;
    letter-spacing: 0.1em;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 48px;
    padding-block: 72px 96px;
  }
}

@media (min-width: 1440px) {
  .page-about .about-dots {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 14px;
    position: fixed;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
  }

  .page-about .about-dots__link {
    display: flex;
    align-items: center;
    gap: 9px;
    text-decoration: none;
  }

  .page-about .about-dots__label {
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.08em;
    white-space: nowrap;
    color: var(--mist);
    opacity: 0;
    transform: translateX(6px);
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  }

  .page-about .about-dots__link::after {
    content: "";
    width: 8px;
    height: 8px;
    flex: none;
    border-radius: 50%;
    border: 1px solid var(--line);
    background: var(--ink-900);
    transition: background 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  }

  .page-about .about-dots__link:hover .about-dots__label,
  .page-about .about-dots__link:focus-visible .about-dots__label {
    opacity: 1;
    transform: translateX(0);
  }

  .page-about .about-dots__link:hover::after,
  .page-about .about-dots__link:focus-visible::after {
    background: var(--cyan);
    border-color: var(--cyan);
    box-shadow: 0 0 0 4px var(--cyan-soft);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__item,
  .page-about .about-rail__dot,
  .page-about .about-timeline__item::before,
  .page-about .about-inline-link,
  .page-about .about-dots__label {
    transition: none;
  }
}