.page-about {
  --about-rail: 236px;
  --about-shadow: 0 26px 60px -40px rgba(0, 0, 0, .95);
  background: var(--ink-deep);
  color: var(--paper-white);
  font-family: var(--font-body);
  padding-bottom: 80px;
}

/* ---------- 首屏 ---------- */
.page-about .breadcrumb {
  margin: 26px 0 0;
}

.page-about .about-hero {
  padding: 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--pulse-cyan);
  margin: 0;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.8vw, 58px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper-white);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 250, 255, .82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-fact {
  border-top: 1px solid var(--navy-line);
  padding-top: 12px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--pulse-cyan);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-mute);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-l);
  overflow: hidden;
  background: var(--panel-navy);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* ---------- 章节节奏 ---------- */
.page-about .section {
  margin-top: 72px;
}

.page-about .section__title {
  font-family: var(--font-display);
  letter-spacing: -.02em;
}

.page-about .lede {
  color: rgba(247, 250, 255, .76);
}

/* ---------- 版本演进分段切换 ---------- */
.page-about .about-gen__tabs {
  position: relative;
  margin-top: 32px;
  display: grid;
  gap: 18px;
}

.page-about .about-gen__tabs .tabs__indicator {
  display: none;
}

.page-about .about-gen__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding-bottom: 8px;
}

.page-about .about-gen__tab {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--panel-navy);
  border: 1px solid var(--navy-line);
  border-radius: var(--r-s);
  color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.3;
  text-align: left;
  cursor: pointer;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .about-gen__tab:hover {
  transform: translateY(-2px);
  border-color: var(--slate-mute);
}

.page-about .about-gen__tab:focus-visible {
  outline: 2px solid var(--pulse-cyan);
  outline-offset: 2px;
}

.page-about .about-gen__tab[aria-selected="true"] {
  border-color: var(--pulse-cyan);
  background: linear-gradient(180deg, rgba(52, 245, 197, .16), rgba(15, 26, 43, .98) 76%);
}

.page-about .about-gen__no {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--signal-amber);
}

.page-about .about-gen__name {
  flex: 1 1 auto;
  white-space: nowrap;
}

.page-about .about-gen__ver {
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--slate-mute);
  border: 1px solid var(--navy-line);
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}

.page-about .about-gen__panels {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-about .about-gen__panel {
  background: var(--cream);
  color: var(--brown-ink);
  border-radius: var(--r-l);
  padding: 26px 22px;
  box-shadow: var(--about-shadow);
}

.page-about .about-gen__panel[hidden] {
  display: none;
}

.page-about .about-gen__panel h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.4vw, 29px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--brown-ink);
}

.page-about .about-gen__panel p {
  margin: 14px 0 0;
  max-width: 40ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--brown-ink);
}

.page-about .about-gen__panel ul {
  margin: 14px 0 0;
  padding-left: 18px;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-gen__panel li + li {
  margin-top: 6px;
}

.page-about .about-note {
  margin-top: 20px;
  padding: 14px 16px;
  background: var(--panel-navy);
  border-left: 2px solid var(--pulse-cyan);
  border-radius: 0 var(--r-s) var(--r-s) 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(247, 250, 255, .86);
  transition: transform .22s ease, box-shadow .22s ease;
}

.page-about .about-note:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px -26px rgba(0, 0, 0, .95);
}

/* ---------- 三类模块 ---------- */
.page-about .about-modules__grid {
  margin-top: 32px;
  display: grid;
  gap: 16px;
}

.page-about .about-mod {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 24px 22px;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-l);
  background: var(--panel-navy);
}

.page-about .about-mod > * {
  position: relative;
  z-index: 1;
}

.page-about .about-mod::before {
  content: "";
  position: absolute;
  z-index: 0;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  filter: blur(72px);
  opacity: .38;
  pointer-events: none;
}

.page-about .about-mod--result::before {
  top: -150px;
  left: -120px;
  background: var(--pulse-cyan);
}

.page-about .about-mod--replay::before {
  right: -130px;
  bottom: -170px;
  background: var(--track-orange);
}

.page-about .about-mod--cross {
  background:
    linear-gradient(118deg, rgba(52, 245, 197, .16), rgba(255, 107, 44, .16)),
    var(--panel-navy);
}

.page-about .about-mod--cross::before {
  display: none;
}

.page-about .about-mod__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate-mute);
}

.page-about .about-mod--result .about-mod__code {
  color: var(--pulse-cyan);
}

.page-about .about-mod--replay .about-mod__code {
  color: var(--track-orange);
}

.page-about .about-mod--cross .about-mod__code {
  color: var(--signal-amber);
}

.page-about .about-mod__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--paper-white);
}

.page-about .about-mod__text {
  margin: 12px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(247, 250, 255, .8);
}

.page-about .about-spine {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-spine__chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(52, 245, 197, .5);
  color: var(--pulse-cyan);
}

.page-about .about-spine__chip:last-child {
  border-color: rgba(255, 107, 44, .5);
  color: var(--track-orange);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow__grid {
  margin-top: 32px;
  display: grid;
  gap: 26px;
}

.page-about .about-flow__media {
  margin: 0;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-l);
  overflow: hidden;
  background: var(--panel-navy);
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-flow__media figcaption {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-mute);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--navy-line);
}

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

.page-about .about-flow__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  padding-top: 4px;
  color: var(--pulse-cyan);
}

.page-about .about-flow__step:nth-child(2) .about-flow__idx {
  color: var(--signal-amber);
}

.page-about .about-flow__step:nth-child(3) .about-flow__idx {
  color: var(--track-orange);
}

.page-about .about-flow__step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper-white);
}

.page-about .about-flow__step p {
  margin: 8px 0 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 250, 255, .78);
}

.page-about .about-windows {
  margin-top: 26px;
  padding: 18px;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-m);
  background: var(--panel-navy);
}

.page-about .about-windows__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal-amber);
}

.page-about .about-windows__row {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--navy-line);
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(247, 250, 255, .78);
}

.page-about .about-windows__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--pulse-cyan);
}

.page-about .about-windows__row--extra .about-windows__time {
  color: var(--track-orange);
}

/* ---------- 团队 ---------- */
.page-about .about-table-wrap {
  margin-top: 30px;
  overflow-x: auto;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-m);
  background: var(--panel-navy);
}

.page-about .about-team {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-team__caption {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-about .about-team th,
.page-about .about-team td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--navy-line);
}

.page-about .about-team thead th {
  background: rgba(7, 12, 22, .6);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate-mute);
}

.page-about .about-team tbody th {
  font-weight: 600;
  color: var(--paper-white);
  white-space: nowrap;
}

.page-about .about-team tbody td {
  color: rgba(247, 250, 255, .78);
  line-height: 1.72;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  color: var(--pulse-cyan);
  white-space: nowrap;
}

.page-about .about-team tbody tr:last-child th,
.page-about .about-team tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-team__note {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-mute);
  border-left: 2px solid var(--navy-line);
  padding-left: 16px;
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-scope {
  margin-top: 30px;
  display: grid;
  gap: 1px;
  background: var(--navy-line);
  border: 1px solid var(--navy-line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-scope__item {
  background: var(--panel-navy);
  padding: 20px 18px;
}

.page-about .about-scope__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--pulse-cyan);
}

.page-about .about-scope__num--orange {
  color: var(--track-orange);
}

.page-about .about-scope__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-mute);
}

.page-about .about-filing {
  margin: 22px 0 0;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--signal-amber);
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.82;
  color: rgba(247, 250, 255, .74);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  margin-top: 30px;
  padding: 28px 22px;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-l);
  background:
    radial-gradient(120% 150% at 0% 0%, rgba(52, 245, 197, .14), transparent 62%),
    radial-gradient(120% 150% at 100% 100%, rgba(255, 107, 44, .14), transparent 62%),
    var(--panel-navy);
}

.page-about .about-next__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--paper-white);
}

.page-about .about-next__text {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 250, 255, .78);
}

.page-about .about-next__actions {
  margin-top: 22px;
}

/* ---------- 刻度图 ---------- */
.page-about .about-tick {
  margin: 72px 0 0;
}

.page-about .about-tick img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--navy-line);
  border-radius: var(--r-l);
}

.page-about .about-tick figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate-mute);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-gen__tabs {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

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

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

  .page-about .about-gen__name {
    white-space: normal;
  }

  .page-about .about-gen__panel {
    padding: 34px 34px 30px;
  }

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

  .page-about .about-mod--result {
    grid-column: span 7;
  }

  .page-about .about-mod--replay {
    grid-column: span 5;
  }

  .page-about .about-mod--cross {
    grid-column: span 12;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-next__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
    align-items: center;
    padding: 36px 38px;
  }

  .page-about .about-next__actions {
    margin-top: 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-scope {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-gen__tab,
  .page-about .about-note {
    transition: none;
  }

  .page-about .about-gen__tab:hover,
  .page-about .about-note:hover {
    transform: none;
  }
}