.page-about {
  --ab-axis: 11px;
  --ab-indent: 32px;
  background: var(--stone);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 20px 0 0;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 26px 0 0;
  isolation: isolate;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 100%;
  background-image: repeating-linear-gradient(114deg, rgba(14, 78, 118, 0.06) 0 1px, transparent 1px 27px);
  pointer-events: none;
  z-index: -1;
}

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

.page-about .ab-hero__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 8.2vw, 64px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  max-width: 16em;
}

.page-about .ab-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  margin-top: 20px;
  background: var(--lava);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .ab-hero__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 60ch;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--mist);
  border: 1px solid var(--mist);
}

.page-about .ab-fact {
  background: var(--stone);
  padding: 14px 12px 16px;
  min-width: 0;
}

.page-about .ab-fact__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 6px;
}

.page-about .ab-fact__v {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--lake);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__media {
  margin: 32px 0 0;
  border-top: 3px solid var(--qk-green);
  display: block;
}

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

/* ---------- 章节主轨 ---------- */
.page-about .ab-ledger {
  position: relative;
  padding: 56px 0 8px var(--ab-indent);
}

.page-about .ab-ledger::before {
  content: "";
  position: absolute;
  left: var(--ab-axis);
  top: 74px;
  bottom: 28px;
  width: 1px;
  background: linear-gradient(180deg, var(--lake) 0%, var(--lake-l) 42%, rgba(14, 78, 118, 0.14) 100%);
}

.page-about .ab-chapter {
  position: relative;
  padding-bottom: 62px;
}

.page-about .ab-chapter:last-of-type {
  padding-bottom: 34px;
}

.page-about .ab-chapter::before {
  content: "";
  position: absolute;
  left: calc(-1 * (var(--ab-indent) - var(--ab-axis) + 5px));
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--qk-green);
  box-shadow: 0 0 0 3px var(--stone);
}

.page-about .ab-chapter--flip::before,
.page-about .ab-chapter:nth-of-type(2n)::before {
  background: var(--lake);
}

.page-about .ab-chapter--dark::before {
  background: var(--lava);
}

.page-about .ab-chapter__no {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .ab-chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--lava);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-chapter__tag {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .ab-chapter__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 23px;
  line-height: 1.32;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  padding-bottom: 13px;
  border-bottom: 2px solid var(--qk-green);
  max-width: 22em;
}

.page-about .ab-chapter__lede {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 60ch;
}

.page-about .ab-chapter__foot {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-chapter__body {
  max-width: 66ch;
}

.page-about .ab-chapter__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
}

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

.page-about .ab-link {
  color: var(--lake-l);
  border-bottom: 1px solid rgba(44, 134, 181, 0.42);
  text-decoration: none;
}

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

/* ---------- 三条数据线 ---------- */
.page-about .ab-lines {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
}

.page-about .ab-line {
  background: var(--stone);
  padding: 20px 18px 22px;
}

.page-about .ab-line__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
  background: var(--lake);
  padding: 3px 9px;
  margin-bottom: 12px;
}

.page-about .ab-line__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 9px;
  color: var(--ink);
}

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

/* ---------- 换新深色块 ---------- */
.page-about .ab-chapter--dark {
  background: linear-gradient(140deg, var(--lake-ink) 0%, var(--lake) 58%, var(--lake-l) 100%);
  color: #fff;
  padding: 30px 20px 26px;
  margin-bottom: 62px;
  padding-bottom: 30px;
}

.page-about .ab-chapter--dark .ab-chapter__no {
  margin-bottom: 10px;
}

.page-about .ab-chapter__no--onDark .ab-chapter__num {
  color: var(--lava-warm);
}

.page-about .ab-chapter__no--onDark .ab-chapter__tag {
  color: rgba(255, 255, 255, 0.62);
}

.page-about .ab-chapter--dark .ab-chapter__title {
  color: #fff;
  border-bottom-color: var(--lava);
}

.page-about .ab-chapter--dark .ab-chapter__body p {
  color: rgba(255, 255, 255, 0.86);
}

.page-about .ab-chapter--dark .ab-link--onDark {
  color: var(--lava-warm);
  border-bottom-color: rgba(255, 162, 75, 0.5);
}

.page-about .ab-chapter--dark .ab-link--onDark:hover,
.page-about .ab-chapter--dark .ab-link--onDark:focus-visible {
  color: #fff;
  border-bottom-color: #fff;
}

.page-about .ab-shifts {
  list-style: none;
  margin: 22px 0 4px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(255, 255, 255, 0.22);
}

.page-about .ab-shift {
  background: rgba(8, 43, 65, 0.42);
  padding: 18px 16px 20px;
  border-left: 3px solid var(--lava);
}

.page-about .ab-shift__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.page-about .ab-shift__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 24px;
  margin-top: 6px;
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--mist);
  border: 1px solid var(--mist);
}

.page-about .ab-role {
  background: var(--stone);
  padding: 16px 16px 18px;
  border-left: 3px solid var(--qk-green-l);
}

.page-about .ab-role__title {
  margin: 0 0 7px;
  font-size: 15px;
  font-weight: 700;
  color: var(--lake);
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ab-team__media {
  margin: 0;
  display: block;
  border-bottom: 3px solid var(--qk-green);
}

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

.page-about .ab-team__main .ab-chapter__lede {
  margin-bottom: 18px;
}

/* ---------- 覆盖赛事 ---------- */
.page-about .ab-cover {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  border-top: 1px solid var(--mist);
}

.page-about .ab-cover__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--mist);
}

.page-about .ab-cover__name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.5;
  color: var(--lake);
  border-left: 3px solid var(--qk-green);
  padding-left: 10px;
}

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

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-partner {
  background: var(--ice);
  padding: 16px 16px 18px;
  border-top: 2px solid var(--lake-l);
}

.page-about .ab-partner__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16px;
  color: var(--lake);
}

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

.page-about .ab-partners__media {
  margin: 26px 0 0;
  display: block;
  border-left: 3px solid var(--wine);
}

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

/* ---------- 里程碑分段 ---------- */
.page-about .ab-miles {
  margin: 6px 0 0;
}

.page-about .ab-miles .tabs__list {
  position: relative;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--mist);
  scrollbar-width: thin;
}

.page-about .ab-miles .tabs__btn {
  flex: 0 0 auto;
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 11px 16px 12px;
  margin-bottom: -1px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-miles .tabs__btn:first-child {
  padding-left: 0;
}

.page-about .ab-miles .tabs__btn:hover {
  color: var(--lake);
}

.page-about .ab-miles .tabs__btn[aria-selected="true"] {
  color: var(--lake);
  border-bottom-color: var(--lava);
}

.page-about .ab-miles .tabs__btn:focus-visible {
  outline: 2px solid var(--lake-l);
  outline-offset: 2px;
}

.page-about .ab-miles .tabs__indicator {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  background: var(--lava);
  transition: transform 0.26s var(--ease), width 0.26s var(--ease);
}

.page-about .ab-miles__panel {
  padding-top: 22px;
}

.page-about .ab-miles__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-miles__item {
  position: relative;
  padding: 0 0 22px 24px;
  border-left: 1px solid var(--mist);
}

.page-about .ab-miles__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .ab-miles__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--qk-green-l);
}

.page-about .ab-miles__item:last-child::before {
  background: var(--lava);
}

.page-about .ab-miles__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lava);
  margin: 0 0 7px;
}

.page-about .ab-miles__title {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

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

/* ---------- 收尾入口 ---------- */
.page-about .ab-next {
  margin-top: 46px;
  background: var(--lake-ink);
  color: #fff;
  padding: 46px 0 54px;
}

.page-about .ab-next__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.3;
  margin: 0 0 12px;
  color: #fff;
}

.page-about .ab-next__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 16px;
  background: var(--lava);
}

.page-about .ab-next__lede {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.74);
  max-width: 52ch;
}

.page-about .ab-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .ab-next__link {
  display: block;
  background: var(--lake-ink);
  padding: 16px 16px 18px;
  text-decoration: none;
  color: #fff;
  transition: background 0.2s var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  background: var(--lake-deep);
}

.page-about .ab-next__k {
  display: block;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--lava-warm);
  margin-bottom: 7px;
}

.page-about .ab-next__v {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 平板及桌面 ---------- */
@media (min-width: 700px) {
  .page-about .ab-cover__item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 20px;
    padding: 18px 0;
  }

  .page-about .ab-cover__name {
    font-size: 18px;
  }

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

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

@media (min-width: 900px) {
  .page-about {
    --ab-axis: 19px;
    --ab-indent: 56px;
  }

  .page-about .breadcrumb {
    padding-top: 26px;
  }

  .page-about .ab-hero {
    padding-top: 38px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) 420px;
    gap: 48px;
    align-items: end;
    margin-top: 30px;
  }

  .page-about .ab-hero__lede {
    font-size: 17px;
  }

  .page-about .ab-fact__v {
    font-size: 34px;
  }

  .page-about .ab-hero__media {
    margin-top: 44px;
  }

  .page-about .ab-ledger {
    padding-top: 76px;
  }

  .page-about .ab-ledger::before {
    top: 96px;
  }

  .page-about .ab-chapter {
    padding-bottom: 84px;
  }

  .page-about .ab-chapter__title {
    font-size: 30px;
    margin-bottom: 22px;
  }

  .page-about .ab-chapter__lede,
  .page-about .ab-chapter__body p {
    font-size: 16px;
  }

  .page-about .ab-chapter--flip {
    margin-left: 8%;
  }

  .page-about .ab-chapter--dark {
    padding: 44px 40px 40px;
    margin-bottom: 84px;
    margin-left: 0;
  }

  .page-about .ab-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 28px;
  }

  .page-about .ab-line {
    padding: 24px 20px 26px;
  }

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

  .page-about .ab-shift {
    padding: 22px 20px 24px;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
    margin-top: 10px;
  }

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

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

  .page-about .ab-partners__media {
    margin-top: 34px;
  }

  .page-about .ab-next {
    margin-top: 60px;
    padding: 64px 0 72px;
  }

  .page-about .ab-next__title {
    font-size: 32px;
  }

  .page-about .ab-next__lede {
    font-size: 16px;
    margin-bottom: 32px;
  }

  .page-about .ab-next__link {
    padding: 22px 22px 24px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 13em;
  }

  .page-about .ab-chapter--flip {
    margin-left: 11%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-miles .tabs__btn,
  .page-about .ab-miles .tabs__indicator,
  .page-about .ab-next__link {
    transition: none;
  }
}