.page-about {
  --about-pad: clamp(44px, 7vw, 88px);
  --about-card: #16203a;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(36px, 6vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  font-size: clamp(34px, 8vw, 62px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.025em;
  color: var(--text);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lead {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-hero__lead:last-of-type {
  margin-bottom: 26px;
}

/* ---------- 首屏展板 ---------- */
.page-about .about-board {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(158deg, #18243f 0%, #101a33 68%);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel), 9px 9px 0 -2px rgba(36, 48, 77, 0.6);
}

.page-about .about-board::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 62%;
  height: 3px;
  background: linear-gradient(90deg, var(--sun), var(--flare));
  border-radius: var(--radius) 0 0 0;
}

.page-about .about-board__head {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10px;
}

.page-about .about-facts {
  margin: 0;
  display: grid;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-facts__row dt {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-facts__row dd {
  margin: 0;
  flex: none;
  font-size: 17px;
  font-weight: 800;
  color: var(--sun);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-facts__num {
  font-size: 30px;
  font-weight: 900;
  letter-spacing: -0.02em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .about-intro {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .about-split__text p {
  margin: 0 0 15px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-split__text .section-title {
  margin-bottom: 18px;
}

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

.page-about .about-split__figure .figure__frame {
  box-shadow: var(--shadow-panel), -8px 8px 0 -2px rgba(36, 48, 77, 0.55);
}

/* ---------- 要点列表 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--sun);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-about .about-points strong {
  color: var(--text);
  font-weight: 800;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: clamp(24px, 4vw, 36px);
  display: grid;
  gap: 16px;
}

.page-about .about-team__row {
  padding: 18px 20px;
  background: var(--about-card);
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 0.35s var(--ease-out), background 0.35s var(--ease-out);
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  border-color: rgba(255, 176, 32, 0.65);
  background: #1b2744;
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-team__count {
  flex: none;
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-team__count .num {
  font-size: 20px;
  font-weight: 900;
  color: var(--sun);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__bar {
  margin: 12px 0 11px;
  height: 8px;
  border-radius: 4px;
  background: #0e1730;
  overflow: hidden;
}

.page-about .about-team__bar span {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--amber), var(--sun));
  transition: filter 0.35s var(--ease-out);
}

.page-about .about-team__row:hover .about-team__bar span {
  filter: brightness(1.15);
}

.page-about .about-team__row:nth-child(1) .about-team__bar span { width: 28%; }
.page-about .about-team__row:nth-child(2) .about-team__bar span { width: 21%; }
.page-about .about-team__row:nth-child(3) .about-team__bar span { width: 15%; }
.page-about .about-team__row:nth-child(4) .about-team__bar span { width: 36%; }

.page-about .about-team__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  transition: color 0.35s var(--ease-out);
}

.page-about .about-team__row:hover .about-team__note,
.page-about .about-team__row:focus-within .about-team__note {
  color: var(--text-dim);
}

/* ---------- 流程链 ---------- */
.page-about .about-flow {
  margin-top: clamp(26px, 4vw, 38px);
  border-left: 2px solid var(--line);
}

.page-about .about-flow__step {
  position: relative;
  padding-left: 28px;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 30px;
  width: 16px;
  height: 16px;
  background: var(--space);
  border: 2px solid var(--sun);
  border-radius: 3px;
  transform: rotate(45deg);
  transition: background 0.3s var(--ease-out);
}

.page-about .about-flow__step[open]::before {
  background: var(--sun);
}

.page-about .about-flow__step > summary {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  color: var(--text);
}

.page-about .about-flow__step > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow__idx {
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--about-card);
  border: 2px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--sun);
  transition: background 0.3s var(--ease-out), color 0.3s var(--ease-out);
}

.page-about .about-flow__step[open] .about-flow__idx {
  background: var(--sun);
  border-color: var(--sun);
  color: var(--text-on-sun);
}

.page-about .about-flow__title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-flow__step > summary:hover .about-flow__title {
  color: var(--sun);
}

.page-about .about-flow__body {
  padding: 0 0 20px 54px;
}

.page-about .about-flow__body p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-flow__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .about-flow__figure .figure__frame {
  box-shadow: var(--shadow-panel);
}

/* ---------- 版本刻度尺 ---------- */
.page-about .about-ruler {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-ruler__tick {
  position: relative;
  padding-left: 22px;
  border-left: 2px solid var(--line);
}

.page-about .about-ruler__tick::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--amber);
  transform: rotate(45deg);
}

.page-about .about-ruler__ver {
  display: block;
  margin-bottom: 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-dim);
}

.page-about .about-ruler__desc {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-ruler__tick--current {
  border-left-color: var(--sun);
}

.page-about .about-ruler__tick--current::before {
  width: 14px;
  height: 14px;
  left: -8px;
  top: 4px;
  background: var(--sun);
}

.page-about .about-ruler__tick--current .about-ruler__ver {
  font-size: 30px;
  font-weight: 900;
  color: var(--sun);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ruler__tick--current .about-ruler__desc {
  color: var(--text-dim);
}

.page-about .about-ruler__foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-credits {
  margin-top: clamp(24px, 4vw, 36px);
  display: grid;
  gap: 18px;
}

.page-about .about-credit {
  padding: clamp(20px, 3vw, 26px);
  background: linear-gradient(165deg, #17223c 0%, #111a30 100%);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .about-credit .plate {
  margin-bottom: 16px;
}

.page-about .about-credit__figure {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 800;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

.page-about .about-credit__num {
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--sun);
  font-variant-numeric: tabular-nums;
}

.page-about .about-credit__desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-top: clamp(16px, 3vw, 32px);
  padding-bottom: clamp(56px, 9vw, 108px);
}

.page-about .about-next__box {
  padding: clamp(26px, 4vw, 44px);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(255, 75, 43, 0.18) 0%, rgba(255, 75, 43, 0) 58%),
    linear-gradient(150deg, #1a2540 0%, #0d1529 100%);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-next__text {
  margin: 0 0 22px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-next__foot {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-next__foot a {
  color: var(--sun);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-split--reverse .about-split__figure {
    order: -1;
  }

  .page-about .about-ruler {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin-top: 46px;
    border-top: 3px solid var(--line);
  }

  .page-about .about-ruler__tick {
    padding: 32px 22px 0 0;
    border-left: 0;
    border-right: 1px dashed var(--line);
  }

  .page-about .about-ruler__tick:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-ruler__tick::before {
    left: 0;
    top: -8px;
    width: 12px;
    height: 12px;
  }

  .page-about .about-ruler__tick--current {
    background: linear-gradient(180deg, rgba(255, 176, 32, 0.12) 0%, rgba(255, 176, 32, 0) 62%);
    padding-left: 22px;
    margin-left: -22px;
    padding-right: 22px;
    border-right: 0;
  }

  .page-about .about-ruler__tick--current::before {
    left: 22px;
    top: -10px;
    width: 16px;
    height: 16px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__row,
  .page-about .about-team__bar span,
  .page-about .about-team__note,
  .page-about .about-flow__idx,
  .page-about .about-flow__step::before {
    transition: none;
  }

  .page-about .about-hero__title,
  .page-about .about-next__title {
    transform: none;
  }
}