.page-about {
  --about-rule: rgba(228, 218, 203, .2);
  --about-sec: var(--yb-text-dim);
  --about-strong: var(--yb-sand);
  --about-glow: rgba(46, 93, 76, .55);
  --about-hair: rgba(228, 218, 203, .16);
  --about-hair-strong: rgba(228, 218, 203, .32);
  background: var(--yb-deep);
  color: var(--yb-sand);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: 116px 0 56px;
  background:
    radial-gradient(130% 90% at 84% 4%, var(--about-glow), transparent 62%),
    linear-gradient(180deg, #0C2B25 0%, #09201D 100%);
  overflow: hidden;
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-hair) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .34;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(120% 100% at 72% 0%, #000 18%, transparent 76%);
  mask-image: radial-gradient(120% 100% at 72% 0%, #000 18%, transparent 76%);
}

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

.page-about .about-cover__crumb {
  margin-bottom: 44px;
}

.page-about .about-cover__eyebrow {
  color: var(--yb-copper-lt);
  margin: 0 0 14px;
  letter-spacing: .18em;
}

.page-about .about-cover__title {
  font-family: var(--yb-font-display);
  font-weight: 900;
  font-size: clamp(2.125rem, 7.6vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--yb-paper);
  margin: 0 0 30px;
  max-width: 15em;
}

.page-about .about-cover__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-cover__lede {
  margin: 0;
  font-family: var(--yb-font-body);
  font-size: var(--yb-fs-16);
  line-height: 1.78;
  color: var(--yb-text-soft);
  max-width: 38em;
  border-left: 2px solid var(--yb-copper);
  padding-left: 18px;
}

.page-about .about-cover__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--yb-r-card);
}

.page-about .about-stat {
  margin: 0;
  padding: 16px 18px;
  background: rgba(9, 32, 29, .82);
  border-radius: 4px;
}

.page-about .about-stat__label {
  margin: 0 0 8px;
  font-size: var(--yb-fs-12);
  letter-spacing: .1em;
  color: var(--yb-text-dim);
}

.page-about .about-stat__value {
  margin: 0;
  font-family: var(--yb-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--yb-fs-32);
  line-height: 1;
  color: var(--yb-lime);
}

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  padding-top: 8px;
  padding-bottom: 72px;
}

.page-about .about-rail__title {
  margin: 0 0 16px;
  font-family: var(--yb-font-data);
  font-size: var(--yb-fs-12);
  letter-spacing: .18em;
  color: var(--yb-text-dim);
}

.page-about .yb-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
}

.page-about .yb-rail__num {
  font-family: var(--yb-font-data);
  font-size: var(--yb-fs-12);
  color: var(--yb-copper-lt);
}

.page-about .yb-rail__label {
  font-size: var(--yb-fs-14);
}

.page-about .yb-rail__link[data-current] .yb-rail__dot,
.page-about .yb-rail__link[aria-current] .yb-rail__dot {
  background: var(--yb-lime);
}

/* ---------- 面板 ---------- */
.page-about .about-panel {
  border-radius: var(--yb-r-card);
  padding: 28px 22px;
  margin: 0 0 26px;
  scroll-margin-top: 96px;
}

.page-about .about-panel--light {
  --about-rule: rgba(19, 23, 22, .16);
  --about-sec: rgba(19, 23, 22, .66);
  --about-strong: var(--yb-charcoal);
  background: var(--yb-sand);
  color: var(--yb-charcoal);
}

.page-about .about-panel--dark {
  --about-rule: rgba(228, 218, 203, .18);
  --about-sec: var(--yb-text-dim);
  --about-strong: var(--yb-sand);
  background: var(--yb-charcoal);
  color: var(--yb-sand);
}

.page-about .about-panel--moss {
  --about-rule: rgba(246, 242, 234, .24);
  --about-sec: rgba(238, 242, 234, .78);
  --about-strong: var(--yb-paper);
  background: var(--yb-moss);
  color: var(--yb-paper);
}

.page-about .about-panel__head {
  position: relative;
  padding-bottom: 18px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-panel__num {
  display: block;
  font-family: var(--yb-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--yb-fs-14);
  letter-spacing: .16em;
  color: var(--yb-copper);
  margin-bottom: 8px;
}

.page-about .about-panel--dark .about-panel__num,
.page-about .about-panel--moss .about-panel__num {
  color: var(--yb-copper-lt);
}

.page-about .about-panel__title {
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: clamp(1.375rem, 3.6vw, 2rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--about-strong);
  margin: 0;
}

.page-about .about-panel__kicker {
  margin: 10px 0 0;
  font-size: var(--yb-fs-14);
  letter-spacing: .06em;
  color: var(--yb-copper);
}

.page-about .about-panel--dark .about-panel__kicker,
.page-about .about-panel--moss .about-panel__kicker {
  color: var(--yb-lime);
}

.page-about .about-panel__foot {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule);
  font-size: var(--yb-fs-14);
  line-height: 1.7;
  color: var(--about-sec);
}

.page-about .about-prose {
  max-width: 36em;
  font-family: var(--yb-font-body);
  font-size: var(--yb-fs-16);
  line-height: 1.78;
  color: var(--about-strong);
}

.page-about .about-prose p {
  margin: 0 0 16px;
}

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

/* ---------- 要点三条 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-point {
  padding: 18px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-point__title {
  margin: 0 0 6px;
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: var(--yb-fs-16);
  color: var(--about-strong);
}

.page-about .about-point p {
  margin: 0;
  font-size: var(--yb-fs-14);
  line-height: 1.72;
  color: var(--about-sec);
}

/* ---------- 时间刻度 ---------- */
.page-about .about-journey__lede {
  margin: 0 0 8px;
  max-width: 36em;
  font-size: var(--yb-fs-16);
  line-height: 1.78;
  color: var(--about-strong);
}

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

.page-about .about-tl__axis {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 12px;
  pointer-events: none;
}

.page-about .about-tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 24px;
}

.page-about .about-tl__dot {
  position: absolute;
  top: 6px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--yb-copper);
  box-shadow: 0 0 0 3px rgba(180, 118, 58, .2);
}

.page-about .about-tl__item.is-current .about-tl__dot {
  background: var(--yb-lime);
  box-shadow: 0 0 0 4px rgba(200, 240, 75, .2);
}

.page-about .about-tl__year {
  margin: 0 0 4px;
  font-family: var(--yb-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--yb-fs-24);
  line-height: 1;
  color: var(--yb-copper-lt);
}

.page-about .about-tl__item.is-current .about-tl__year {
  color: var(--yb-lime);
}

.page-about .about-tl__title {
  margin: 0 0 6px;
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: var(--yb-fs-16);
  color: var(--yb-paper);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: var(--yb-fs-14);
  line-height: 1.7;
  color: var(--yb-text-dim);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0 0 24px;
}

.page-about .about-figure .yb-figure__media {
  border-radius: var(--yb-r-img);
  overflow: hidden;
}

.page-about .about-figure .yb-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .yb-figure__cap {
  margin-top: 10px;
  font-size: var(--yb-fs-12);
  line-height: 1.65;
  color: var(--about-sec);
}

/* ---------- 团队 ---------- */
.page-about .about-team__lede {
  margin-bottom: 22px;
}

.page-about .about-team-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-team-card {
  border: 1px solid var(--about-rule);
  border-radius: var(--yb-r-card);
  padding: 20px 18px 22px;
  background: rgba(246, 242, 234, .55);
  transition: border-color .24s ease, background-color .24s ease, transform .24s ease;
  outline: none;
}

.page-about .about-panel--light .about-team-card {
  background: rgba(246, 242, 234, .6);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-visible,
.page-about .about-team-card:focus-within {
  border-color: var(--yb-copper);
  background: rgba(180, 118, 58, .12);
  transform: translateY(-4px);
}

.page-about .about-team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--yb-lime);
}

.page-about .about-team-card__num {
  margin: 0 0 6px;
  font-family: var(--yb-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--yb-fs-48);
  line-height: 1;
  color: var(--yb-copper);
}

.page-about .about-team-card__title {
  margin: 0 0 8px;
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: var(--yb-fs-18);
  color: var(--about-strong);
}

.page-about .about-team-card__text {
  margin: 0;
  font-size: var(--yb-fs-14);
  line-height: 1.72;
  color: var(--about-sec);
}

.page-about .about-team-card__detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  transition: max-height .3s ease, opacity .24s ease, margin-top .24s ease;
}

.page-about .about-team-card:hover .about-team-card__detail,
.page-about .about-team-card:focus-visible .about-team-card__detail,
.page-about .about-team-card:focus-within .about-team-card__detail {
  max-height: 260px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .about-team-card__detail p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-rule);
  font-size: var(--yb-fs-14);
  line-height: 1.72;
  color: var(--about-strong);
}

/* ---------- 流程阶梯 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 8px 0 0 8px;
  padding: 0;
  border-left: 1px solid var(--about-rule);
}

.page-about .about-step {
  position: relative;
  padding: 0 0 24px 26px;
}

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

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--yb-copper);
}

.page-about .about-step__num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--yb-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--yb-fs-12);
  letter-spacing: .14em;
  color: var(--yb-lime);
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: var(--yb-fs-18);
  color: var(--yb-paper);
}

.page-about .about-step p {
  margin: 0;
  max-width: 34em;
  font-size: var(--yb-fs-14);
  line-height: 1.72;
  color: var(--about-sec);
}

.page-about .about-process__figure {
  margin: 28px 0 0;
  max-width: 420px;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 26px;
}

.page-about .about-coverage__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  padding: 1px;
  background: var(--about-rule);
  border-radius: var(--yb-r-card);
}

.page-about .about-cov-item {
  margin: 0;
  padding: 14px 16px;
  background: rgba(246, 242, 234, .82);
  border-radius: 4px;
}

.page-about .about-cov-item dt {
  font-size: var(--yb-fs-12);
  letter-spacing: .06em;
  color: rgba(19, 23, 22, .6);
  margin-bottom: 6px;
}

.page-about .about-cov-item dd {
  margin: 0;
  font-family: var(--yb-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--yb-fs-24);
  line-height: 1;
  color: #1F4B3D;
}

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

/* ---------- 合作 ---------- */
.page-about .about-partner-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-partner-card {
  border: 1px solid var(--about-rule);
  border-radius: var(--yb-r-card);
  padding: 20px 18px;
  background: rgba(46, 93, 76, .18);
  transition: border-color .24s ease, background-color .24s ease;
}

.page-about .about-partner-card:hover {
  border-color: var(--yb-copper-lt);
  background: rgba(46, 93, 76, .3);
}

.page-about .about-partner-card__title {
  margin: 0 0 10px;
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: var(--yb-fs-18);
  color: var(--yb-paper);
}

.page-about .about-partner-card p {
  margin: 0;
  font-size: var(--yb-fs-14);
  line-height: 1.74;
  color: var(--about-sec);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: 12px;
  padding: 40px 22px 44px;
  border-radius: var(--yb-r-card);
  border: 1px solid rgba(180, 118, 58, .38);
  background:
    radial-gradient(120% 130% at 88% 0%, rgba(46, 93, 76, .68), transparent 64%),
    linear-gradient(180deg, #0F322B 0%, #0A2320 100%);
}

.page-about .about-cta__title {
  margin: 12px 0 14px;
  font-family: var(--yb-font-headline);
  font-weight: 700;
  font-size: clamp(1.375rem, 4vw, 2rem);
  line-height: 1.28;
  color: var(--yb-paper);
  max-width: 22em;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 36em;
  font-size: var(--yb-fs-16);
  line-height: 1.78;
  color: var(--yb-text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  margin-top: 26px;
}

.page-about .about-cta__link {
  font-size: var(--yb-fs-14);
}

/* ---------- 焦点反馈 ---------- */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--yb-lime);
  outline-offset: 3px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-cover {
    padding: 136px 0 72px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .about-cover__lede {
    font-size: var(--yb-fs-18);
  }

  .page-about .about-panel {
    padding: 38px 34px;
    margin-bottom: 34px;
  }

  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 22px;
    border-top: 1px solid var(--about-rule);
    border-bottom: none;
  }

  .page-about .about-point {
    border-bottom: none;
    border-top: 2px solid var(--yb-copper);
  }

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

  .page-about .about-team-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-team-card:nth-child(3) {
    margin-top: 10px;
  }

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

  .page-about .about-cta {
    padding: 52px 42px 56px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    padding-bottom: 104px;
  }

  .page-about .yb-layout {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .yb-layout__aside {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-panel {
    padding: 48px 46px;
    margin-bottom: 44px;
  }

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

  .page-about .about-tl__axis {
    display: block;
  }

  .page-about .about-tl__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-tl__item {
    padding-left: 0;
    padding-top: 34px;
  }

  .page-about .about-tl__dot {
    top: 0;
    left: 0;
  }

  .page-about .about-tl__year {
    font-size: var(--yb-fs-24);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-coverage__figure {
    margin-top: 4px;
  }

  .page-about .about-steps {
    max-width: 44em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card,
  .page-about .about-partner-card,
  .page-about .about-team-card__detail {
    transition: none;
  }

  .page-about .about-team-card:hover,
  .page-about .about-team-card:focus-visible,
  .page-about .about-team-card:focus-within {
    transform: none;
  }
}