.page-about {
  --ab-shell-gap: 22px;
  --ab-card-bg: #161B22;
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(1000px 560px at 84% -6%, rgba(226, 35, 26, 0.16), transparent 62%),
    radial-gradient(820px 480px at -6% 30%, rgba(36, 224, 200, 0.08), transparent 60%);
  background-repeat: no-repeat;
}

.page-about [id] {
  scroll-margin-top: calc(var(--yb-header-h) + 26px);
}

/* ---------- 侧边章节轨道 ---------- */
.page-about .ab-rail {
  display: none;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumbs {
  margin-bottom: 26px;
}

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

.page-about .ab-hero__top {
  display: grid;
  gap: 30px;
  align-items: end;
}

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

.page-about .ab-hero__title {
  margin: 12px 0 18px;
  font-family: var(--yb-font-display);
  font-size: clamp(34px, 9.5vw, 66px);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--yb-ink);
  text-wrap: balance;
}

.page-about .ab-hero__title em {
  font-style: normal;
  font-size: 1.14em;
  color: var(--yb-red);
  letter-spacing: -0.01em;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.95;
  color: #C6D0DD;
}

/* 比分牌式数据板 */
.page-about .ab-board {
  position: relative;
  padding: 20px 20px 8px;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-r-lg);
  background: linear-gradient(158deg, #1A212B 0%, #10151C 72%);
  box-shadow: 0 22px 48px -30px rgba(0, 0, 0, 0.9);
}

.page-about .ab-board::before {
  content: "";
  position: absolute;
  left: -1px;
  right: -1px;
  top: -1px;
  height: 4px;
  border-radius: var(--yb-r-lg) var(--yb-r-lg) 0 0;
  background: linear-gradient(90deg, var(--yb-red), var(--yb-gold) 52%, var(--yb-cyan));
}

.page-about .ab-board__row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(138, 148, 166, 0.28);
}

.page-about .ab-board__row--last {
  border-bottom: 0;
}

.page-about .ab-board__num {
  flex: 0 0 auto;
  font-family: var(--yb-font-mono);
  font-size: clamp(30px, 8.5vw, 44px);
  font-weight: 700;
  line-height: 0.92;
  color: var(--yb-gold);
  letter-spacing: -0.02em;
}

.page-about .ab-board__num--cyan { color: var(--yb-cyan); }
.page-about .ab-board__num--red { color: var(--yb-red); }

.page-about .ab-board__num sup {
  font-size: 0.5em;
  vertical-align: super;
}

.page-about .ab-board__cap {
  font-size: 13px;
  line-height: 1.6;
  color: var(--yb-muted);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-section {
  position: relative;
}

.page-about .ab-section--panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(22, 27, 34, 0) 0%, rgba(22, 27, 34, 0.72) 18%, rgba(22, 27, 34, 0.72) 82%, rgba(22, 27, 34, 0) 100%);
  pointer-events: none;
}

.page-about .ab-section--panel > .yb-shell {
  position: relative;
}

.page-about .ab-head {
  position: relative;
  padding-left: 20px;
  margin-bottom: 26px;
}

.page-about .ab-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--yb-red), rgba(226, 35, 26, 0));
}

.page-about .ab-head--center {
  padding-left: 0;
  padding-top: 18px;
}

.page-about .ab-head--center::before {
  left: 0;
  right: auto;
  top: 0;
  bottom: auto;
  width: 72px;
  height: 3px;
  background: linear-gradient(90deg, var(--yb-red), var(--yb-cyan));
}

.page-about .ab-head__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--yb-font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--yb-cyan);
}

.page-about .ab-head__title {
  margin: 0;
  font-family: var(--yb-font-display);
  font-size: clamp(26px, 7vw, 42px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--yb-ink);
}

.page-about .ab-head__sub {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--yb-muted);
}

.page-about .ab-head .yb-rule {
  display: block;
  margin-top: 14px;
}

/* ---------- 正文叙事 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 30px;
  align-items: start;
}

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

.page-about .ab-copy p {
  margin: 0 0 18px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.95;
  color: #C6D0DD;
}

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

.page-about .ab-copy a {
  color: var(--yb-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 200, 0.4);
}

.page-about .ab-copy a:hover {
  border-bottom-color: var(--yb-cyan);
}

/* ---------- 图片 ---------- */
.page-about .ab-shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-r-md);
  background: var(--yb-card-bg);
  box-shadow: 0 26px 54px -34px rgba(0, 0, 0, 0.95);
}

.page-about .ab-shot::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--yb-red), rgba(226, 35, 26, 0));
  pointer-events: none;
}

.page-about .ab-shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.08) brightness(0.92);
  transition: transform 600ms var(--yb-ease);
}

.page-about .ab-shot:hover img {
  transform: scale(1.03);
}

.page-about .ab-shot__cap {
  padding: 11px 14px;
  border-top: 1px solid var(--yb-line);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--yb-muted);
  background: rgba(11, 14, 18, 0.6);
}

.page-about .ab-shot--band {
  margin-bottom: 32px;
}

/* ---------- 三支团队 ---------- */
.page-about .ab-teams {
  display: grid;
  gap: 18px;
}

.page-about .ab-team {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-r-md);
  background: var(--yb-card-bg);
  box-shadow: 0 22px 46px -34px rgba(0, 0, 0, 0.95);
  transition: transform 300ms var(--yb-ease), box-shadow 300ms var(--yb-ease), border-color 300ms var(--yb-ease);
}

.page-about .ab-team::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 3px;
  border-radius: 0 0 3px 3px;
}

.page-about .ab-team--red::before { background: var(--yb-red); }
.page-about .ab-team--cyan::before { background: var(--yb-cyan); }
.page-about .ab-team--gold::before { background: var(--yb-gold); }

.page-about .ab-team:hover {
  transform: translateY(-4px);
  border-color: rgba(226, 35, 26, 0.45);
  box-shadow: 0 30px 58px -32px rgba(140, 20, 16, 0.75);
}

.page-about .ab-team__no {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 9px 4px;
  font-family: var(--yb-font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--yb-bg);
  background: var(--yb-paper);
  border-radius: 2px;
  box-shadow: 2px 2px 0 rgba(140, 20, 16, 0.9);
}

.page-about .ab-team__title {
  margin: 0 0 4px;
  font-size: 21px;
  line-height: 1.3;
  color: var(--yb-ink);
}

.page-about .ab-team__role {
  margin: 0 0 14px;
  font-family: var(--yb-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yb-cyan);
}

.page-about .ab-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-team__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: #B3BECB;
}

.page-about .ab-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 2px;
  background: var(--yb-red);
}

/* ---------- 数据来源要点 ---------- */
.page-about .ab-points {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--yb-line);
}

.page-about .ab-points li {
  padding: 13px 0;
  border-bottom: 1px solid var(--yb-line);
  font-size: 14.5px;
  line-height: 1.7;
  color: #B3BECB;
}

.page-about .ab-points strong {
  color: var(--yb-gold);
  font-family: var(--yb-font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
}

/* ---------- 内容把关步骤 ---------- */
.page-about .ab-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  counter-reset: abstep;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--yb-line);
}

.page-about .ab-step:first-child {
  border-top: 1px solid var(--yb-line);
}

.page-about .ab-step__no {
  font-family: var(--yb-font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--yb-red);
  letter-spacing: 0.02em;
}

.page-about .ab-step__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--yb-ink);
}

.page-about .ab-step__body p {
  margin: 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--yb-muted);
}

.page-about .ab-step__body a {
  color: var(--yb-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 200, 0.4);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 30px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--yb-red), var(--yb-cyan) 88%);
}

.page-about .ab-timeline__item {
  position: relative;
  margin-bottom: 12px;
}

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

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--yb-bg);
  border: 2px solid var(--yb-red);
  box-shadow: 0 0 0 4px rgba(226, 35, 26, 0.14);
}

.page-about .ab-node {
  border: 1px solid var(--yb-line);
  border-radius: var(--yb-r-sm);
  background: rgba(22, 27, 34, 0.86);
  transition: border-color 280ms var(--yb-ease), background 280ms var(--yb-ease);
}

.page-about .ab-node[open] {
  border-color: rgba(36, 224, 200, 0.42);
  background: rgba(22, 27, 34, 0.98);
}

.page-about .ab-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--yb-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--yb-cyan);
}

.page-about .ab-node[open] > summary::after {
  content: "–";
}

.page-about .ab-node__year {
  font-family: var(--yb-font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--yb-gold);
}

.page-about .ab-node__title {
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--yb-ink);
}

.page-about .ab-node > p {
  margin: 0;
  padding: 0 16px 16px;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--yb-muted);
}

/* ---------- 读者画像 ---------- */
.page-about .ab-audience {
  display: grid;
  gap: 16px;
}

.page-about .ab-person {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  border: 1px solid var(--yb-line);
  border-left: 3px solid var(--yb-red);
  border-radius: var(--yb-r-sm);
  background: rgba(22, 27, 34, 0.78);
  transition: transform 300ms var(--yb-ease), border-left-color 300ms var(--yb-ease);
}

.page-about .ab-person:nth-child(even) {
  border-left-color: var(--yb-cyan);
}

.page-about .ab-person:hover {
  transform: translateY(-3px);
}

.page-about .ab-person__title {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--yb-ink);
}

.page-about .ab-person__desc {
  margin: 0 0 16px;
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.85;
  color: var(--yb-muted);
}

.page-about .ab-person__link {
  align-self: flex-start;
  font-family: var(--yb-font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--yb-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 200, 0.36);
  padding-bottom: 2px;
}

.page-about .ab-person__link span {
  margin-left: 6px;
}

.page-about .ab-person__link:hover {
  border-bottom-color: var(--yb-cyan);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta__box {
  display: grid;
  gap: 24px;
  padding: 28px 22px;
  border: 1px solid rgba(226, 35, 26, 0.35);
  border-radius: var(--yb-r-lg);
  background:
    linear-gradient(140deg, rgba(226, 35, 26, 0.16) 0%, rgba(11, 14, 18, 0.9) 46%, rgba(36, 224, 200, 0.1) 100%);
  box-shadow: 0 30px 60px -40px rgba(226, 35, 26, 0.9);
}

.page-about .ab-cta__title {
  margin: 10px 0 12px;
  font-family: var(--yb-font-display);
  font-size: clamp(24px, 6.5vw, 38px);
  line-height: 1.1;
  color: var(--yb-ink);
}

.page-about .ab-cta__desc {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.9;
  color: #BFC9D6;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .ab-teams,
  .page-about .ab-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cta__actions {
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 44px;
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    align-items: center;
    padding: 36px 34px;
  }

  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: 50px;
  }

  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 4fr) minmax(0, 5fr);
  }

  .page-about .ab-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    position: relative;
  }

  .page-about .ab-teams::before {
    content: "";
    position: absolute;
    left: 8%;
    right: 8%;
    top: 56px;
    height: 1px;
    background: repeating-linear-gradient(90deg, rgba(36, 224, 200, 0.4) 0 8px, transparent 8px 18px);
    pointer-events: none;
  }

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

  .page-about .ab-team:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .ab-team:nth-child(3) {
    margin-top: 68px;
  }

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

  .page-about .ab-step {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .ab-timeline {
    padding-left: 40px;
  }

  .page-about .ab-timeline::before {
    left: 8px;
  }

  .page-about .ab-timeline__item::before {
    left: -40px;
    top: 20px;
  }
}

@media (min-width: 1280px) {
  .page-about .ab-rail {
    display: block;
    position: fixed;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    width: 84px;
  }

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

  .page-about .ab-rail a {
    display: block;
    padding: 8px 10px;
    text-align: right;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--yb-muted);
    text-decoration: none;
    border-right: 2px solid rgba(138, 148, 166, 0.28);
    transition: color 300ms var(--yb-ease), border-color 300ms var(--yb-ease);
  }

  .page-about .ab-rail a:hover {
    color: var(--yb-ink);
    border-right-color: rgba(138, 148, 166, 0.7);
  }

  .page-about .ab-rail a[data-active="true"] {
    color: var(--yb-cyan);
    border-right-color: var(--yb-cyan);
  }

  .page-about .ab-rail__no {
    display: block;
    font-family: var(--yb-font-mono);
    font-size: 10.5px;
    letter-spacing: 0.2em;
    color: var(--yb-red);
  }

  .page-about .ab-rail a[data-active="true"] .ab-rail__no {
    color: var(--yb-gold);
  }
}

.page-about {
  --yb-card-bg: var(--ab-card-bg);
}