.page-about {
  background: var(--df-ink);
  color: var(--df-white);
}

/* ---------- 面包屑 ---------- */
.page-about .df-crumbs {
  margin: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 36px;
  border-bottom: 1px solid var(--df-line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -120px;
  width: min(760px, 110%);
  height: 480px;
  background:
    radial-gradient(58% 58% at 68% 34%, rgba(224, 74, 63, 0.30), transparent 70%),
    radial-gradient(52% 52% at 28% 62%, rgba(79, 214, 196, 0.18), transparent 72%),
    radial-gradient(60% 60% at 84% 82%, rgba(233, 184, 92, 0.16), transparent 74%);
  filter: blur(8px);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .ab-hero__title {
  font-family: var(--df-font-head);
  font-weight: 800;
  font-size: clamp(40px, 11.5vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
}

.page-about .ab-hero__lede {
  max-width: 30em;
  color: var(--df-white);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--df-line);
  border: 1px solid var(--df-line);
}

.page-about .ab-stats li {
  background: var(--df-ink);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-stats__num {
  font-size: 24px;
  font-weight: 700;
  color: var(--df-gold);
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.page-about .ab-stats__label {
  font-size: 12.5px;
  color: var(--df-muted);
  line-height: 1.5;
}

/* ---------- 正文骨架 ---------- */
.page-about .ab-layout {
  padding-top: 0;
  padding-bottom: 56px;
}

.page-about .ab-index {
  position: sticky;
  top: 0;
  z-index: 6;
  margin: 0 calc(var(--df-pad) * -1) 8px;
  padding: 12px var(--df-pad) 10px;
  background: var(--df-ink);
  border-bottom: 1px solid var(--df-line);
}

.page-about .ab-index__head {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--df-muted);
}

.page-about .ab-index__list {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}

.page-about .ab-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-index__list a {
  display: inline-block;
  font-family: var(--df-font-mono);
  font-size: 13px;
  color: var(--df-muted);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--df-ease), border-color 0.2s var(--df-ease);
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  color: var(--df-gold);
  border-bottom-color: var(--df-gold);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding: 34px 0 10px;
  border-top: 1px solid var(--df-line);
  scroll-margin-top: 84px;
}

.page-about .ab-sec:first-child {
  border-top: 0;
}

.page-about .ab-text {
  color: var(--df-white);
  font-size: 16px;
  line-height: 1.8;
  max-width: 36em;
  margin: 0 0 16px;
}

.page-about .ab-lede {
  max-width: 36em;
  color: var(--df-muted);
}

.page-about .ab-sec .df-note {
  margin-top: 22px;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 24px 0 26px;
}

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

/* ---------- 团队卡片 ---------- */
.page-about .ab-team {
  display: flex;
  gap: 12px;
  margin: 0 calc(var(--df-pad) * -1);
  padding: 2px var(--df-pad) 10px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.page-about .ab-team::-webkit-scrollbar {
  display: none;
}

.page-about .ab-team__card {
  flex: 0 0 76%;
  scroll-snap-align: start;
  background: var(--df-panel);
  border-top: 2px solid var(--df-red);
  padding: 18px 16px 20px;
}

.page-about .ab-team__num {
  display: block;
  font-size: 30px;
  font-weight: 700;
  color: var(--df-red);
  line-height: 1;
  letter-spacing: 0.01em;
}

.page-about .ab-team__name {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .ab-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--df-muted);
}

/* ---------- 四个栏目色带 ---------- */
.page-about .ab-bands {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 22px;
}

.page-about .ab-band {
  position: relative;
  background: var(--df-panel);
  border: 1px solid var(--df-line);
  padding-left: 14px;
}

.page-about .ab-band::before {
  content: "";
  display: block;
  height: 5px;
  width: var(--band-w, 60%);
  background: linear-gradient(90deg, var(--df-red), var(--df-red-deep));
}

.page-about .ab-band:nth-of-type(1) { --band-w: 100%; }
.page-about .ab-band:nth-of-type(2) { --band-w: 78%; }
.page-about .ab-band:nth-of-type(3) { --band-w: 58%; }
.page-about .ab-band:nth-of-type(4) { --band-w: 44%; }

.page-about .ab-band:nth-of-type(2)::before {
  background: linear-gradient(90deg, var(--df-gold), #b98d38);
}

.page-about .ab-band:nth-of-type(3)::before {
  background: linear-gradient(90deg, var(--df-mint), #2c8e84);
}

.page-about .ab-band:nth-of-type(4)::before {
  background: linear-gradient(90deg, var(--df-muted), var(--df-line));
}

.page-about .ab-band__sum {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 14px 14px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-band__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-band__idx {
  font-size: 12px;
  color: var(--df-muted);
  letter-spacing: 0.1em;
}

.page-about .ab-band__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--df-white);
  flex: 1 1 auto;
}

.page-about .ab-band__body {
  padding: 0 14px 16px 0;
}

.page-about .ab-band__body p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--df-muted);
  max-width: 40em;
}

.page-about .ab-band__meta {
  font-size: 12px;
  color: var(--df-gold-soft);
  letter-spacing: 0.04em;
  margin-bottom: 0;
}

/* ---------- 版本时间线 ---------- */
.page-about .ab-tl {
  position: relative;
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 22px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--df-red), var(--df-gold), var(--df-mint));
  opacity: 0.7;
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 26px;
}

.page-about .ab-tl__item:last-child {
  padding-bottom: 8px;
}

.page-about .ab-tl__dot {
  position: absolute;
  left: -22px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--df-ink);
  border: 1px solid var(--df-mint);
  box-shadow: 0 0 0 3px rgba(79, 214, 196, 0.12);
}

.page-about .ab-tl__ver {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--df-gold);
}

.page-about .ab-tl__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--df-white);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--df-muted);
  max-width: 36em;
}

.page-about .ab-tl__pop {
  margin-top: 10px;
  padding: 12px 14px;
  background: var(--df-ink-deep);
  border-left: 2px solid var(--df-mint);
  font-size: 13px;
  line-height: 1.75;
  color: var(--df-muted);
  max-width: 36em;
}

.page-about .ab-tl__pop p {
  margin: 0;
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  margin-top: 22px;
}

.page-about .ab-cadence .df-panel__head h3 {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--df-white);
}

.page-about .ab-cadence .df-panel__body p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--df-muted);
}

/* ---------- 栏目共建 ---------- */
.page-about .ab-partners {
  margin-top: 24px;
}

.page-about .ab-partner {
  padding: 18px 16px 20px;
  background: var(--df-panel);
  border: 1px solid var(--df-line);
  border-left: 2px solid var(--df-gold);
}

.page-about .ab-partner__tag {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--df-gold-soft);
}

.page-about .ab-partner h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--df-white);
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--df-muted);
}

/* ---------- 结尾 ---------- */
.page-about .ab-next {
  padding-bottom: 20px;
}

.page-about .ab-next .df-actions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats__num {
    font-size: 26px;
  }

  .page-about .ab-team {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .ab-team__card {
    flex: none;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding: 56px 0 48px;
  }

  .page-about .ab-layout {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 40px;
    padding-bottom: 80px;
  }

  .page-about .ab-index {
    position: sticky;
    top: 96px;
    margin: 0;
    padding: 4px 0 4px 16px;
    background: transparent;
    border-bottom: 0;
    border-left: 1px solid var(--df-line);
    overflow: visible;
    z-index: 1;
  }

  .page-about .ab-index__head {
    margin-bottom: 12px;
  }

  .page-about .ab-index__list {
    display: block;
    overflow: visible;
    white-space: normal;
  }

  .page-about .ab-index__list li {
    margin-bottom: 12px;
  }

  .page-about .ab-index__list a {
    font-size: 13.5px;
  }

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

  .page-about .ab-sec {
    padding: 42px 0 14px;
    scroll-margin-top: 110px;
  }

  .page-about .ab-text {
    font-size: 16.5px;
  }

  /* 时间线：悬停显示版本要点 */
  .page-about .ab-tl__pop {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 6px;
    width: min(360px, 100%);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.24s var(--df-ease), transform 0.24s var(--df-ease), visibility 0.24s;
    z-index: 4;
    background: var(--df-ink-deep);
  }

  .page-about .ab-tl__item:hover .ab-tl__pop,
  .page-about .ab-tl__item:focus-within .ab-tl__pop,
  .page-about .ab-tl__item:focus .ab-tl__pop {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .page-about .ab-tl__item {
    padding-bottom: 30px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    font-size: clamp(72px, 8vw, 104px);
  }

  .page-about .ab-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__list a,
  .page-about .ab-tl__pop {
    transition: none;
  }

  .page-about .ab-tl__pop {
    transform: none;
  }
}