.page-about {
  background: var(--bg-abyss);
  color: var(--ink);
  position: relative;
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(118deg, rgba(58, 237, 212, .028) 0 1px, transparent 1px 18px);
}

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

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: clamp(500px, 78svh, 780px);
  padding: clamp(88px, 16vw, 140px) 0 clamp(36px, 6vw, 70px);
  border-bottom: 1px solid var(--edge);
}

.page-about .ab-hero__img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
  opacity: .42;
  filter: saturate(.85) contrast(1.05);
}

.page-about .ab-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, rgba(5, 19, 15, .74) 0%, rgba(5, 19, 15, .34) 36%, rgba(5, 19, 15, .97) 100%),
    radial-gradient(130% 82% at 8% 104%, rgba(58, 237, 212, .16), transparent 62%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
}

.page-about .ab-hero__crumb {
  margin-bottom: clamp(22px, 5vw, 40px);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--neon);
}

.page-about .ab-hero__title {
  margin: 0 0 clamp(16px, 3vw, 26px);
  font-size: clamp(30px, 7.2vw, 60px);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -.012em;
  max-width: 19ch;
}

.page-about .ab-hero__lead {
  max-width: 60ch;
  margin: 0 0 clamp(24px, 4.5vw, 38px);
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.85;
  color: rgba(234, 244, 241, .78);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 规模数据条 ---------- */
.page-about .ab-scale {
  padding: clamp(30px, 6vw, 56px) 0;
  border-bottom: 1px solid var(--edge);
  background: linear-gradient(180deg, rgba(10, 26, 43, .92), rgba(5, 19, 15, .55));
}

.page-about .ab-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-scale__item {
  background: var(--panel);
  padding: clamp(18px, 3vw, 26px) clamp(14px, 2.6vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-scale__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--neon);
}

.page-about .ab-scale__k {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节定位条 ---------- */
.page-about .ab-jump {
  background: var(--bg-night);
  border-bottom: 1px solid var(--edge);
}

.page-about .ab-jump__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 14px 0;
  scrollbar-width: none;
}

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

.page-about .ab-jump__link {
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .ab-jump__link:hover,
.page-about .ab-jump__link:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
  outline: none;
}

.page-about .ab-jump__link[data-active] {
  color: var(--neon);
  border-color: var(--neon);
  background: rgba(58, 237, 212, .08);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: clamp(52px, 10vw, 118px) 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .ab-chapter--last {
  border-bottom: none;
  padding-bottom: clamp(60px, 11vw, 130px);
}

.page-about .ab-chapter--band {
  background: linear-gradient(180deg, rgba(10, 26, 43, .8), rgba(5, 19, 15, .2));
}

.page-about .ab-chapter__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 4vw, 32px);
}

.page-about .ab-chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .ab-chapter__num {
  display: block;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(66px, 19vw, 144px);
  line-height: .8;
  letter-spacing: -.055em;
  font-variant-numeric: tabular-nums;
  color: var(--panel);
  -webkit-text-stroke: 1px rgba(58, 237, 212, .24);
}

.page-about .ab-chapter__num--inline {
  margin-bottom: 4px;
}

.page-about .ab-chapter__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .ab-chapter__title {
  margin: 0 0 clamp(16px, 3vw, 24px);
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: -.01em;
  max-width: 22ch;
}

.page-about .ab-chapter__title--wide {
  max-width: 30ch;
}

.page-about .ab-chapter__lede {
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 62ch;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-chapter__main p {
  margin: 0 0 1.1em;
  max-width: 66ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: rgba(234, 244, 241, .82);
}

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

/* ---------- 数据卡 ---------- */
.page-about .ab-card {
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: clamp(18px, 3vw, 26px);
  max-width: 360px;
  background: var(--panel);
  border: 1px solid var(--neon);
  border-radius: var(--radius);
  box-shadow: 8px 8px 0 rgba(3, 10, 8, .55);
  transition: transform 240ms var(--ease);
}

.page-about .ab-card:hover {
  transform: translateY(-4px);
}

.page-about .ab-card__k {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .ab-card__v {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 8vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--neon);
}

.page-about .ab-card__d {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0 0 clamp(26px, 5vw, 40px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-flow__step {
  background: var(--panel);
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
}

.page-about .ab-flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--coral);
}

.page-about .ab-flow__name {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-flow__desc {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .ab-media {
  margin: clamp(24px, 5vw, 40px) 0;
}

.page-about .ab-media img {
  display: block;
  width: 100%;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .ab-media--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .ab-media__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队数字 ---------- */
.page-about .ab-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.5vw, 20px);
  margin: 0 0 clamp(24px, 4vw, 36px);
}

.page-about .ab-crew__item {
  padding: clamp(18px, 3vw, 24px);
  background: var(--panel);
  border: 1px solid var(--edge);
  border-left: 2px solid var(--neon);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-crew__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--neon);
}

.page-about .ab-crew__k {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-crew__d {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  overflow-x: auto;
  padding-bottom: 14px;
  scrollbar-width: thin;
  scrollbar-color: var(--edge) transparent;
}

.page-about .ab-timeline__track {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  display: flex;
  gap: clamp(18px, 3.5vw, 36px);
  min-width: max-content;
}

.page-about .ab-tl {
  position: relative;
  flex: 0 0 auto;
  width: clamp(196px, 60vw, 268px);
  padding-top: 52px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  top: 36px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(58, 237, 212, .55), rgba(28, 59, 54, .9));
}

.page-about .ab-tl__year {
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--neon);
}

.page-about .ab-tl__dot {
  position: absolute;
  top: 31px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 5px rgba(58, 237, 212, .13);
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(234, 244, 241, .78);
}

/* ---------- 合作区 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
}

.page-about .ab-split__media {
  margin: 0;
  order: -1;
}

.page-about .ab-split__media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
}

.page-about .ab-split__text p {
  margin: 0 0 1.1em;
  max-width: 66ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: rgba(234, 244, 241, .82);
}

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

/* ---------- 会员档位 ---------- */
.page-about .ab-tiers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.5vw, 20px);
  margin: clamp(24px, 4.5vw, 38px) 0 clamp(40px, 7vw, 72px);
}

.page-about .ab-tier {
  padding: clamp(20px, 3.2vw, 28px);
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-tier--feature {
  border-color: var(--neon);
  box-shadow: 8px 8px 0 rgba(3, 10, 8, .55);
  background: linear-gradient(180deg, rgba(58, 237, 212, .07), rgba(14, 38, 32, 1) 46%);
}

.page-about .ab-tier__name {
  margin: 0;
  font-size: clamp(20px, 3vw, 24px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-tier--feature .ab-tier__name {
  color: var(--neon);
}

.page-about .ab-tier__tag {
  margin: -6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--coral);
}

.page-about .ab-tier__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-tier__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(234, 244, 241, .78);
}

.page-about .ab-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 1px;
  background: var(--neon);
}

/* ---------- 联系 ---------- */
.page-about .ab-contact {
  padding-top: clamp(28px, 5vw, 44px);
  border-top: 1px solid var(--edge);
}

.page-about .ab-contact__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.4vw, 28px);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .ab-contact__lede {
  margin: 0 0 clamp(22px, 4vw, 32px);
  max-width: 62ch;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-contact__item {
  background: var(--bg-night);
  padding: clamp(18px, 3vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-contact__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .ab-contact__v {
  margin: 0;
  font-size: clamp(15px, 2.2vw, 18px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  word-break: break-word;
}

.page-about .ab-contact__d {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 34px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-tier--feature {
    grid-column: span 2;
  }

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

@media (min-width: 900px) {
  .page-about .ab-chapter__inner {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-about .ab-chapter__aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .page-about .ab-chapter__num {
    font-size: clamp(96px, 11vw, 148px);
  }

  .page-about .ab-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: clamp(36px, 4vw, 56px);
    align-items: start;
  }

  .page-about .ab-split__media {
    order: 0;
  }

  .page-about .ab-split__media img {
    aspect-ratio: 5 / 7;
  }

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

  .page-about .ab-tier--feature {
    grid-column: span 1;
    transform: translateY(-14px);
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 17ch;
  }

  .page-about .ab-chapter__inner {
    grid-template-columns: minmax(0, 228px) minmax(0, 1fr);
  }
}

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

  .page-about .ab-card:hover {
    transform: none;
  }

  .page-about .ab-tier--feature {
    transform: none;
  }
}