.page-about {
  --ab-rail: 236px;
  color: var(--text);
  overflow-x: clip;
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(20px, 4vw, 48px) 0 clamp(26px, 4vw, 52px);
  isolation: isolate;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 78%;
  background:
    radial-gradient(58% 60% at 18% 28%, rgba(51, 235, 214, .16), transparent 72%),
    radial-gradient(52% 56% at 84% 6%, rgba(138, 92, 255, .22), transparent 72%),
    radial-gradient(40% 44% at 62% 78%, rgba(255, 138, 61, .10), transparent 76%);
  filter: blur(8px);
  pointer-events: none;
  z-index: -1;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .ab-hero__visual {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: var(--night);
  box-shadow: 0 24px 70px rgba(7, 11, 28, .7), 0 0 60px rgba(51, 235, 214, .10);
}

.page-about .ab-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-hero__stamp {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--text);
  background: rgba(7, 11, 28, .62);
  border: 1px solid var(--glass-line);
  border-radius: 999px;
  padding: 5px 12px;
  backdrop-filter: blur(6px);
}

.page-about .ab-hero__copy h1 {
  font-size: clamp(1.9rem, 5vw, 3.3rem);
  font-weight: 250;
  line-height: 1.18;
  letter-spacing: .02em;
  margin: 14px 0 0;
  text-shadow: 0 0 34px rgba(51, 235, 214, .22);
}

.page-about .ab-hero__copy .lede {
  margin: 16px 0 0;
  max-width: 34ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .ab-stats {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .ab-stats__item {
  border-top: 1px solid var(--grid-line);
  padding-top: 10px;
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .ab-stats__key {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-faint);
}

.page-about .breadcrumbs {
  margin: clamp(6px, 1.5vw, 14px) auto clamp(20px, 3vw, 34px);
  font-size: 13px;
  color: var(--text-faint);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}

/* ---------- 分屏：索引 + 叙事 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-index {
  padding: 14px 16px;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  background: var(--glass);
}

.page-about .ab-index__list {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-bottom: 2px solid var(--grid-line);
  color: var(--text-dim);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--violet);
}

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

.page-about .ab-sec {
  scroll-margin-top: 96px;
}

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .prose {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 团队与覆盖 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 18px;
}

.page-about .ab-split__media {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: var(--night);
}

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

.page-about .ab-split__cap {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--text-faint);
  border-top: 1px solid var(--grid-line);
}

.page-about .ab-tags {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 横向频道带 ---------- */
.page-about .ab-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 78%;
  gap: 14px;
  margin-top: 22px;
  padding: 4px 4px 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .ab-rail:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--r-md);
}

.page-about .ab-channel {
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(138, 92, 255, .14), rgba(255, 255, 255, .05) 58%);
  transition: transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .ab-channel:hover {
  transform: translateY(-4px);
  border-color: rgba(51, 235, 214, .5);
  box-shadow: 0 0 26px rgba(51, 235, 214, .16);
}

.page-about .ab-channel__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--violet);
}

.page-about .ab-channel__name {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .ab-channel__desc {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 厂商对照矩阵 ---------- */
.page-about .ab-matrix {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 13px;
}

.page-about .ab-matrix__cap {
  caption-side: top;
  text-align: left;
  padding: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-faint);
}

.page-about .ab-matrix th,
.page-about .ab-matrix td {
  padding: 11px 13px;
  text-align: left;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .ab-matrix thead th {
  background: var(--night);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .1em;
  white-space: nowrap;
}

.page-about .ab-matrix tbody th {
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
}

.page-about .ab-matrix tbody td {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
}

.page-about .ab-matrix tbody tr:hover td,
.page-about .ab-matrix tbody tr:hover th {
  background: rgba(51, 235, 214, .06);
  color: var(--text);
}

/* ---------- 暖纸时间轴 ---------- */
.page-about .ab-history {
  margin-top: 20px;
  padding: clamp(20px, 3.4vw, 36px);
  border-radius: var(--r-lg);
  background: var(--paper);
  color: var(--deep-text);
  box-shadow: 0 20px 60px rgba(7, 11, 28, .55);
}

.page-about .ab-history__banner {
  margin: 0 0 clamp(20px, 3vw, 32px);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink);
}

.page-about .ab-history__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .ab-stage {
  position: relative;
  padding-left: 26px;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  bottom: -22px;
  width: 1px;
  background: linear-gradient(180deg, rgba(20, 26, 46, .45), rgba(20, 26, 46, .12));
}

.page-about .ab-stage:last-child::before {
  display: none;
}

.page-about .ab-stage__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(51, 235, 214, .8);
}

.page-about .ab-stage:nth-child(2) .ab-stage__dot {
  background: var(--violet);
  box-shadow: 0 0 14px rgba(138, 92, 255, .8);
}

.page-about .ab-stage:nth-child(3) .ab-stage__dot {
  background: var(--cyan);
}

.page-about .ab-stage:nth-child(4) .ab-stage__dot {
  background: var(--orange);
  box-shadow: 0 0 14px rgba(255, 138, 61, .8);
}

.page-about .ab-history .coord {
  color: var(--deep-muted);
  font-size: 11px;
  letter-spacing: .16em;
}

.page-about .ab-stage h3 {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--deep-text);
}

.page-about .ab-stage p {
  margin: 6px 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--deep-muted);
}

/* ---------- 会员等级 ---------- */
.page-about .ab-levels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-level {
  padding: 16px;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  background: var(--glass);
  transition: transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .ab-level:hover,
.page-about .ab-level:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(138, 92, 255, .55);
  box-shadow: 0 0 26px rgba(138, 92, 255, .18);
  outline: none;
}

.page-about .ab-level__name {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
}

.page-about .ab-level__brief {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--text-faint);
}

.page-about .ab-level__rights {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .ab-level__rights li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .ab-level__rights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

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

  .page-about .ab-rail {
    grid-auto-columns: 240px;
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .ab-split__media {
    position: sticky;
    top: 100px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .ab-index {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-index__list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    overflow: visible;
  }

  .page-about .ab-index__link {
    border-bottom: 0;
    border-left: 2px solid var(--grid-line);
    border-radius: 0;
    white-space: normal;
  }

  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(51, 235, 214, .07);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-levels {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-level__rights {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .36s var(--ease), opacity .28s var(--ease), margin-top .36s var(--ease);
    margin-top: 0;
  }

  .page-about .ab-level:hover .ab-level__rights,
  .page-about .ab-level:focus-within .ab-level__rights,
  .page-about .ab-level:focus-visible .ab-level__rights {
    max-height: 180px;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-channel,
  .page-about .ab-level,
  .page-about .ab-level__rights {
    transition: none;
  }
}