.page-about {
  --about-index-w: 220px;
  --about-gap: 40px;
  background: var(--space);
  color: var(--ink);
  padding: 32px 0 96px;
  position: relative;
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 520px;
  background:
    radial-gradient(ellipse 60% 45% at 78% 8%, rgba(0, 229, 255, 0.14), transparent 62%),
    radial-gradient(ellipse 45% 40% at 12% 0%, rgba(255, 45, 120, 0.10), transparent 68%);
  pointer-events: none;
}

.page-about .about-wrap {
  position: relative;
  z-index: 1;
}

/* 面包屑 */
.page-about .about-crumb {
  margin-bottom: 28px;
}
.page-about .about-crumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--cyan);
}
.page-about .about-crumb li + li::before {
  content: "/";
  color: var(--line);
  margin-right: 8px;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 12px 0 48px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-hero .kicker {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  margin: 0 0 18px;
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.04;
  letter-spacing: 0.02em;
  margin: 0 0 24px;
  color: var(--ink);
  max-width: 18ch;
  text-wrap: balance;
}
.page-about .about-hero__lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 42em;
  margin: 0 0 36px;
}
.page-about .about-hero__lede::first-letter {
  color: var(--gold);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.page-about .about-stat {
  background: var(--deep-ink);
  padding: 20px 22px 22px;
  position: relative;
}
.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.page-about .about-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  color: var(--ink);
}
.page-about .about-stat__num {
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}
.page-about .about-stat__unit {
  font-size: 14px;
  color: var(--muted);
}
.page-about .about-stat--cyan .about-stat__num {
  color: var(--cyan);
}
.page-about .about-stat--gold .about-stat__num {
  color: var(--gold);
}

/* 主栅格 */
.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: 48px;
}

/* 章节索引 */
.page-about .about-index {
  display: none;
}
.page-about .about-index__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin: 0 0 16px;
  padding-left: 14px;
  border-left: 2px solid var(--magenta);
}
.page-about .about-index__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-index__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  border-left-color: var(--cyan);
  background: rgba(0, 229, 255, 0.06);
}
.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line);
  letter-spacing: 0.06em;
}

/* 正文流 */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding: 0 0 64px;
  scroll-margin-top: 24px;
}
.page-about .about-sec + .about-sec {
  padding-top: 56px;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-sec__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--magenta);
  text-transform: uppercase;
  margin: 0 0 14px;
}
.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin: 0 0 16px;
  max-width: 22ch;
  text-wrap: balance;
}
.page-about .about-sec__lede {
  font-size: 17px;
  line-height: 1.75;
  color: var(--cyan);
  margin: 0 0 22px;
  max-width: 38em;
}
.page-about .about-sec p {
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink);
  margin: 0 0 18px;
  max-width: 40em;
}
.page-about .about-sec__tail {
  margin-top: 26px !important;
  padding-left: 18px;
  border-left: 3px solid var(--gold);
  color: var(--muted) !important;
}
.page-about .about-sec__pull {
  margin: 30px 0 0 !important;
  padding: 22px 24px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.4vw, 26px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--gold);
  background: linear-gradient(100deg, rgba(255, 200, 87, 0.10), rgba(0, 229, 255, 0.05) 60%, transparent);
  border-left: 4px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
  max-width: none !important;
}

/* 图 */
.page-about .about-figure {
  margin: 28px 0 0;
}
.page-about .about-figure__img,
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--panel);
}
.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
}
.page-about .about-figure--tall img {
  aspect-ratio: 14 / 9;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%);
}
.page-about .about-figure--orbit img {
  aspect-ratio: 2 / 1;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.92;
}
.page-about .about-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* 图文并排 */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 8px;
}
.page-about .about-split__text p:last-child {
  margin-bottom: 0;
}

/* 指标卡 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 12px;
}
.page-about .about-metric {
  background: var(--deep-ink);
  border: 1px solid var(--line-soft);
  padding: 22px 22px 24px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-metric--accent {
  background: linear-gradient(155deg, rgba(255, 45, 120, 0.16), var(--deep-ink) 55%);
  border-color: rgba(255, 45, 120, 0.45);
}
.page-about .about-metric__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 10px !important;
  text-transform: uppercase;
  max-width: none !important;
}
.page-about .about-metric h3 {
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 12px;
}
.page-about .about-metric p {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0 !important;
  max-width: none !important;
}

/* 时间线 */
.page-about .about-sec--timeline {
  position: relative;
}
.page-about .about-timeline {
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--magenta) 48%, var(--gold));
  opacity: 0.55;
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 0 0 30px 34px;
  position: relative;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__mark {
  display: flex;
  align-items: center;
  gap: 10px;
  position: absolute;
  left: 0;
  top: 0;
}
.page-about .about-timeline__dot {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 200, 87, 0.16), 0 0 18px rgba(255, 200, 87, 0.55);
  flex: none;
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--gold);
  padding-left: 26px;
  display: block;
}
.page-about .about-timeline__body {
  padding-top: 24px;
}
.page-about .about-timeline__body h3 {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 8px;
}
.page-about .about-timeline__body p {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
  max-width: 40em;
}

/* 内容四线 */
.page-about .about-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-top: 16px;
}
.page-about .about-line {
  background: var(--space);
  padding: 22px 20px 24px;
  position: relative;
}
.page-about .about-line__tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--space);
  background: var(--cyan);
  margin-bottom: 14px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 8px 100%);
}
.page-about .about-line:nth-child(2) .about-line__tag { background: var(--magenta); color: var(--ink); }
.page-about .about-line:nth-child(3) .about-line__tag { background: var(--gold); }
.page-about .about-line:nth-child(4) .about-line__tag { background: var(--green); }
.page-about .about-line h3 {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 10px;
}
.page-about .about-line p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
}

/* 理由 */
.page-about .about-sec--why {
  background: linear-gradient(180deg, transparent, rgba(6, 16, 35, 0.65));
  padding: 56px 22px 64px;
  margin: 0 -22px;
  clip-path: polygon(0 18px, 100% 0, 100% 100%, 0 100%);
}
.page-about .about-reasons {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  gap: 22px;
}
.page-about .about-reasons li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--line-soft);
}
.page-about .about-reasons li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-reasons__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  min-width: 3.4em;
  letter-spacing: -0.02em;
}
.page-about .about-reasons__unit {
  font-size: 13px;
  color: var(--muted);
  margin-left: 2px;
  font-weight: 400;
}
.page-about .about-reasons h3 {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 8px;
}
.page-about .about-reasons p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
  max-width: 40em;
}

/* 公开信息 */
.page-about .about-sec--info {
  border-top: 1px solid var(--line-soft);
}
.page-about .about-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 20px;
}
.page-about .about-info__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .about-info__list > div {
  background: var(--deep-ink);
  padding: 16px 20px;
  display: grid;
  gap: 6px;
}
.page-about .about-info__list dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-about .about-info__list dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ink);
  word-break: break-word;
  font-family: var(--font-mono);
}
.page-about .about-info__note p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 14px;
  max-width: 38em;
}
.page-about .about-info__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-info__tail {
  margin-top: 40px !important;
  font-size: 15px !important;
  color: var(--muted) !important;
  max-width: 40em !important;
}
.page-about .about-info__tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: border-color 0.2s ease;
}
.page-about .about-info__tail a:hover,
.page-about .about-info__tail a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 中屏 */
@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-metric--accent {
    grid-column: 1 / -1;
  }
  .page-about .about-lines {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-reasons {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 32px;
  }
  .page-about .about-reasons li {
    border-bottom: 0;
    padding-bottom: 0;
  }
  .page-about .about-info {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .page-about .about-sec--why {
    margin: 0 -32px;
    padding-left: 32px;
    padding-right: 32px;
  }
}

/* 桌面 */
@media (min-width: 960px) {
  .page-about {
    padding-top: 48px;
    padding-bottom: 128px;
  }
  .page-about .about-grid {
    grid-template-columns: var(--about-index-w) 1fr;
    gap: 64px;
    margin-top: 64px;
  }
  .page-about .about-index {
    display: block;
    position: sticky;
    top: 32px;
    align-self: start;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    padding-right: 4px;
  }
  .page-about .about-split {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
  }
  .page-about .about-figure--tall {
    margin-top: 6px;
  }
  .page-about .about-metrics {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-metric--accent {
    grid-column: auto;
  }
  .page-about .about-sec {
    padding-bottom: 80px;
  }
  .page-about .about-sec + .about-sec {
    padding-top: 72px;
  }
  .page-about .about-timeline__item {
    padding-left: 44px;
    grid-template-columns: 1fr;
  }
  .page-about .about-timeline::before {
    left: 8px;
  }
  .page-about .about-sec--why {
    margin: 0 -56px;
    padding: 72px 56px 80px;
  }
  .page-about .about-lines {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 动效收敛 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-crumb a,
  .page-about .about-info__tail a {
    transition: none;
  }
}