.page-about {
  --ab-edge: rgba(217, 230, 226, 0.16);
  --ab-edge-soft: rgba(217, 230, 226, 0.1);
  --ab-paper-line: rgba(11, 42, 34, 0.18);
  --ab-cut: 22px;
  background: var(--ink-deep);
  color: var(--frost);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: 0.01em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about ul,
.page-about ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .wrap {
  min-width: 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-deep);
  border-bottom: 1px solid var(--ab-edge);
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 32, 26, 0.35) 0%, rgba(8, 32, 26, 0.86) 58%, var(--ink-deep) 100%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: 26px;
  padding-bottom: 52px;
}

.page-about .ab-hero .eyebrow {
  margin-top: 22px;
  color: var(--lime);
}

.page-about .ab-hero h1 {
  margin-top: 12px;
  font-size: clamp(2.35rem, 8.4vw, 5.4rem);
  color: var(--white);
}

.page-about .ab-hero h1 br {
  display: none;
}

.page-about .ab-hero__lede {
  margin-top: 20px;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--frost);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
  border-top: 1px solid var(--ab-edge);
  padding-top: 20px;
}

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

.page-about .ab-stat__num {
  display: block;
  font-size: clamp(1.5rem, 5.4vw, 2.6rem);
  font-weight: 600;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.7rem;
  line-height: 1.45;
  color: var(--ice);
  letter-spacing: 0.02em;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__actions .btn {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-section {
  position: relative;
  padding: 52px 0;
}

.page-about .ab-section h2 {
  margin-top: 10px;
  font-size: clamp(1.7rem, 5vw, 3rem);
  color: var(--white);
}

.page-about .ab-more {
  display: inline-block;
  color: var(--lime);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(199, 255, 61, 0.45);
  padding-bottom: 2px;
}

.page-about .ab-more:hover,
.page-about .ab-more:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ---------- 轮次索引 ---------- */
.page-about .ab-round {
  background: var(--ink-deep);
}

.page-about .ab-round__grid {
  display: grid;
  gap: 34px;
}

.page-about .ab-round__copy p {
  margin-top: 16px;
  max-width: 58ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--frost);
}

.page-about .ab-check {
  display: grid;
  gap: 11px;
  margin-top: 22px;
}

.page-about .ab-check li {
  position: relative;
  padding-left: 22px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--frost);
}

.page-about .ab-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 10px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

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

.page-about .ab-ladder::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 26px;
  bottom: 88px;
  width: 2px;
  background: linear-gradient(180deg, var(--fir) 0%, var(--lime) 100%);
}

.page-about .ab-ladder__item {
  position: relative;
  padding: 14px 0 18px;
  border-bottom: 1px solid var(--ab-edge-soft);
}

.page-about .ab-ladder__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--fir);
}

.page-about .ab-ladder__item.is-now::before {
  left: -28px;
  width: 14px;
  height: 14px;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(199, 255, 61, 0.16);
}

.page-about .ab-ladder__no {
  display: block;
  font-size: 0.86rem;
  color: var(--ice);
  letter-spacing: 0.04em;
}

.page-about .ab-ladder__item.is-now .ab-ladder__no {
  color: var(--lime);
}

.page-about .ab-ladder__title {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-ladder__meta {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--ice);
}

.page-about .ab-ladder__more {
  padding-top: 18px;
}

/* ---------- 球队档案 ---------- */
.page-about .ab-squad {
  background: linear-gradient(158deg, var(--fir) 0%, var(--ink) 58%, var(--ink-deep) 100%);
  border-top: 1px solid var(--ab-edge);
  border-bottom: 1px solid var(--ab-edge);
}

.page-about .ab-squad__head {
  display: grid;
  gap: 26px;
}

.page-about .ab-squad__lede {
  margin-top: 16px;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--frost);
}

.page-about .ab-squad__badge {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  align-self: start;
  padding: 16px 20px;
  background: rgba(17, 21, 23, 0.62);
  border: 1px solid var(--ab-edge);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .ab-squad__badge-num {
  font-size: 2.2rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-squad__badge-label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .ab-squad__list {
  display: grid;
  gap: 1px;
  margin-top: 32px;
  background: var(--ab-edge);
  border-top: 1px solid var(--ab-edge);
  border-left: 1px solid var(--ab-edge);
}

.page-about .ab-squad__item {
  min-width: 0;
  padding: 22px 20px;
  background: var(--ink);
  border-right: 1px solid var(--ab-edge);
  border-bottom: 1px solid var(--ab-edge);
}

.page-about .ab-squad__item h3 {
  font-size: 1.15rem;
  color: var(--lime);
}

.page-about .ab-squad__item p {
  margin-top: 9px;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(217, 230, 226, 0.86);
}

/* ---------- 标签手册（纸砂米阅读面板） ---------- */
.page-about .ab-tags {
  background: var(--ink-deep);
}

.page-about .ab-paper {
  padding: 26px 20px 30px;
  background: var(--paper);
  color: #1B2320;
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-about .ab-paper .eyebrow {
  color: var(--amber);
}

.page-about .ab-paper h2 {
  color: var(--ink);
}

.page-about .ab-paper__lede {
  margin-top: 16px;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: #26332D;
}

.page-about .ab-paper .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .ab-paper .filter-chip {
  padding: 8px 15px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  color: #24322C;
  background: transparent;
  border: 1px solid rgba(11, 42, 34, 0.28);
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.page-about .ab-paper .filter-chip[aria-pressed="true"],
.page-about .ab-paper .filter-chip.is-active {
  background: var(--ink);
  color: var(--lime);
  border-color: var(--ink);
}

.page-about .ab-taglist {
  margin-top: 22px;
  border-top: 1px solid var(--ab-paper-line);
}

.page-about .ab-tagitem {
  min-width: 0;
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--ab-paper-line);
}

.page-about .ab-tagitem.is-filtered-out {
  display: none;
}

.page-about .ab-tagitem__head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-paper .tag-plate {
  display: inline-block;
  padding: 3px 9px;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: rgba(11, 42, 34, 0.09);
  border: 1px solid rgba(11, 42, 34, 0.26);
}

.page-about .ab-paper .tag-plate--orange {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

.page-about .ab-paper .tag-plate--ice {
  background: rgba(30, 90, 70, 0.14);
  border-color: rgba(30, 90, 70, 0.32);
  color: var(--fir);
}

.page-about .ab-tagitem__title {
  margin-top: 12px;
  font-size: 1.14rem;
  color: var(--ink);
}

.page-about .ab-tagitem__text {
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: #2B3630;
}

/* ---------- 北方冬季 ---------- */
.page-about .ab-winter {
  background:
    radial-gradient(120% 78% at 88% 0%, rgba(217, 230, 226, 0.16), transparent 62%),
    var(--ink-deep);
  border-top: 1px solid rgba(217, 230, 226, 0.24);
  border-bottom: 1px solid rgba(217, 230, 226, 0.24);
}

.page-about .ab-winter__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-winter__copy p {
  margin-top: 16px;
  max-width: 56ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--frost);
}

.page-about .ab-winter__copy .ab-more {
  margin-top: 22px;
}

.page-about .ab-winter__media {
  margin: 0;
}

.page-about .ab-winter__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .ab-winter__media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ice);
}

/* ---------- 团队与协作 ---------- */
.page-about .ab-team {
  background: var(--coal);
  border-bottom: 1px solid var(--ab-edge);
}

.page-about .ab-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-team__copy p {
  margin-top: 16px;
  max-width: 58ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(217, 230, 226, 0.9);
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 26px 0 0;
}

.page-about .ab-team__stat {
  min-width: 0;
  padding-left: 12px;
  border-left: 2px solid var(--fir);
}

.page-about .ab-team__stat dt {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.page-about .ab-team__stat dd {
  margin: 6px 0 0;
  font-size: 1.28rem;
  font-weight: 600;
  color: var(--lime);
}

.page-about .ab-team__media {
  margin: 0;
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .ab-steps {
  display: grid;
  gap: 10px;
  margin-top: 38px;
}

.page-about .ab-steps__item {
  padding-top: 12px;
  border-top: 2px solid var(--fir);
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .ab-steps__item.is-last {
  border-top-color: var(--orange);
}

.page-about .ab-steps__no {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--orange);
}

/* ---------- 版本演进 ---------- */
.page-about .ab-version {
  background: var(--ink-deep);
}

.page-about .ab-version__lede {
  margin-top: 16px;
  max-width: 62ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--frost);
}

.page-about .ab-axis {
  margin-top: 34px;
  border-top: 1px solid var(--ab-edge);
}

.page-about .ab-axis__node {
  position: relative;
  min-width: 0;
  padding: 18px 0 20px 26px;
  border-bottom: 1px solid var(--ab-edge-soft);
  transition: background-color 180ms ease;
}

.page-about .ab-axis__dot {
  position: absolute;
  left: 0;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--fir);
  clip-path: polygon(0 0, 100% 0, 100% 66%, 66% 100%, 0 100%);
  transition: background-color 180ms ease;
}

.page-about .ab-axis__node.is-now .ab-axis__dot {
  background: var(--lime);
}

.page-about .ab-axis__gen {
  display: block;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--white);
  transition: color 180ms ease;
}

.page-about .ab-axis__year {
  display: block;
  margin-top: 3px;
  font-size: 0.82rem;
  color: var(--lime);
}

.page-about .ab-axis__desc {
  display: block;
  margin-top: 8px;
  font-size: 0.85rem;
  line-height: 1.68;
  color: rgba(217, 230, 226, 0.82);
}

.page-about .ab-axis__node:hover .ab-axis__gen,
.page-about .ab-axis__node:focus-within .ab-axis__gen {
  color: var(--lime);
}

.page-about .ab-axis__node:hover .ab-axis__dot,
.page-about .ab-axis__node:focus-within .ab-axis__dot {
  background: var(--orange);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  padding: 46px 0 54px;
  background: var(--lime);
  color: var(--ink);
}

.page-about .ab-cta h2 {
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  color: var(--ink);
}

.page-about .ab-cta p {
  margin-top: 14px;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: #15332C;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-cta__links .btn {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
  background: var(--ink);
  color: var(--lime);
  border: 1px solid var(--ink);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-about .ab-cta__links .btn--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(11, 42, 34, 0.55);
}

.page-about .ab-cta__links .btn--ghost:hover,
.page-about .ab-cta__links .btn--ghost:focus-visible {
  background: rgba(11, 42, 34, 0.08);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero h1 br {
    display: block;
  }

  .page-about .ab-hero__lede {
    font-size: 1.06rem;
  }

  .page-about .ab-stat__label {
    font-size: 0.76rem;
  }

  .page-about .ab-paper {
    padding: 36px 34px 40px;
  }

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

  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-taglist {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 34px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    padding-top: 40px;
    padding-bottom: 76px;
  }

  .page-about .ab-hero__stats {
    max-width: 720px;
    gap: 26px;
  }

  .page-about .ab-section {
    padding: 88px 0;
  }

  .page-about .ab-round__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .ab-squad__head {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 40px;
  }

  .page-about .ab-squad__badge {
    align-self: center;
  }

  .page-about .ab-winter__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
    gap: 60px;
    align-items: center;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .ab-cta {
    padding: 72px 0 80px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-axis {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    border-top: 0;
    padding-top: 40px;
    position: relative;
  }

  .page-about .ab-axis::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 12px;
    height: 2px;
    background: linear-gradient(90deg, var(--fir) 0%, var(--lime) 76%, var(--orange) 100%);
  }

  .page-about .ab-axis__node {
    padding: 0 20px 0 0;
    border-bottom: 0;
  }

  .page-about .ab-axis__dot {
    left: 0;
    top: -34px;
  }

  .page-about .ab-axis__node.is-now .ab-axis__dot {
    box-shadow: 0 0 0 4px rgba(199, 255, 61, 0.16);
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}