.page-about {
  --ab-gap: clamp(22px, 3.2vw, 44px);
  --ab-soft: #3A3F44;
}

/* 面包屑行 */
.page-about .ab-crumb-wrap {
  padding-top: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(4px, 1vw, 10px);
}

/* 首屏 */
.page-about .ab-mast {
  padding: clamp(24px, 4vw, 52px) 0 clamp(34px, 5vw, 64px);
}

.page-about .ab-mast__grid {
  display: grid;
  gap: var(--ab-gap);
  align-items: end;
}

.page-about .ab-mast__lead .label {
  color: var(--gray);
  margin: 0 0 14px;
}

.page-about .ab-mast h1 {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(2.05rem, 6.4vw, 4.4rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .ab-mast__intro {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper);
}

/* 团队数据墙 */
.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-fact {
  background: var(--ink-2);
  padding: clamp(14px, 2vw, 22px);
  min-width: 0;
}

.page-about .ab-fact__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
}

.page-about .ab-fact__num {
  margin: 10px 0 0;
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .ab-fact:first-child .ab-fact__num { color: var(--orange); }
.page-about .ab-fact:nth-child(2) .ab-fact__num { color: var(--cyan); }
.page-about .ab-fact:nth-child(4) .ab-fact__num { color: var(--gold); }

.page-about .ab-fact__unit {
  margin-left: 6px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
}

/* 章节索引 */
.page-about .ab-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .ab-index__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-index__list > li {
  border-right: 1px solid var(--line);
}

.page-about .ab-index__link {
  display: inline-flex;
  gap: 10px;
  align-items: baseline;
  padding: 14px clamp(14px, 2vw, 22px);
  font-size: 13px;
  line-height: 1.4;
  color: var(--fg-dim);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .ab-index__link .mono {
  color: var(--gray);
  font-size: 12px;
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--paper);
  background: var(--ink);
}

.page-about .ab-index__link:hover .mono { color: var(--orange); }

/* 通用区块 */
.page-about .ab-sec {
  border-top: 1px solid var(--line);
  padding: clamp(46px, 7vw, 96px) 0;
}

.page-about .ab-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.page-about .sec__num {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .sec__title {
  margin: 0;
  font-size: clamp(1.55rem, 4.6vw, 2.7rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .sec__lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--fg-dim);
}

/* 正文 */
.page-about .ab-p {
  margin: 0 0 20px;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .ab-p--tight { margin-top: 22px; }
.page-about .ab-p--tail { margin: clamp(28px, 4vw, 48px) 0 0; max-width: 44em; }

.page-about .ab-link {
  color: var(--paper);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color var(--t-fast) var(--ease);
}

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

/* 分栏 */
.page-about .ab-split {
  display: grid;
  gap: var(--ab-gap);
}

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

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

.page-about .ab-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.88) contrast(1.04);
}

.page-about .ab-media__cap {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}

/* 清单 */
.page-about .ab-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .ab-list--plain { margin-top: 6px; }

.page-about .ab-list__item {
  display: flex;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-check {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 4px;
  border: 1px solid var(--cyan);
}

.page-about .ab-check::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 5px;
  height: 9px;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: rotate(40deg);
}

.page-about .ab-list__item > div { min-width: 0; }

.page-about .ab-list__title {
  display: block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-list__note {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-dim);
}

/* 区域表 */
.page-about .ab-network .ab-p { margin-bottom: clamp(24px, 3.4vw, 40px); }

.page-about .ab-table-cap {
  padding-bottom: 12px;
  text-align: left;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
}

.page-about .tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .tbl th,
.page-about .tbl td {
  padding: 14px 16px 14px 0;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .tbl th {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  border-bottom-color: var(--gray);
}

.page-about .tbl td:first-child {
  color: var(--paper);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .tbl td { color: var(--fg-dim); }

.page-about .tbl tbody tr {
  transition: background-color var(--t-fast) var(--ease);
}

.page-about .tbl tbody tr:hover { background: rgba(23, 224, 210, 0.07); }

/* 米白折叠引用块 */
.page-about .ab-pull {
  margin-top: clamp(30px, 4vw, 52px);
  background: var(--paper);
  color: var(--ink);
  padding: clamp(22px, 3.4vw, 42px);
}

.page-about .ab-pull summary {
  display: block;
  position: relative;
  padding-right: 34px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-pull summary::after {
  content: "−";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--clay);
}

.page-about .ab-pull:not([open]) summary::after { content: "+"; }

.page-about .ab-pull .label {
  display: block;
  color: var(--clay);
}

.page-about .ab-pull__text {
  display: block;
  margin-top: 12px;
  font-size: clamp(1.15rem, 3vw, 1.7rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.015em;
}

.page-about .ab-pull__more {
  margin: 16px 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-soft);
}

/* 时间轴 */
.page-about .ab-tl-wrap {
  position: relative;
  isolation: isolate;
}

.page-about .ab-tl__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  filter: grayscale(1);
  border: 0;
  margin: 0;
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-tl {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl__item {
  position: relative;
  min-width: 0;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--clay);
}

.page-about .ab-tl__node { display: block; }

.page-about .ab-tl__node summary {
  display: block;
  position: relative;
  padding-right: 26px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-tl__node summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-tl__node[open] summary::after { content: "−"; }

.page-about .ab-tl__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fg-dim);
}

.page-about .ab-tl__name {
  display: block;
  margin-top: 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-tl__node p {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* 经验沉淀 */
.page-about .ab-review { gap: clamp(28px, 4vw, 56px); }

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

.page-about .ab-review__h {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-review__col .ab-p { font-size: 16px; }

/* 行动区 */
.page-about .ab-cta {
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  padding: clamp(46px, 6vw, 88px) 0;
}

.page-about .ab-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: end;
}

.page-about .ab-cta__inner .label {
  margin: 0 0 12px;
  color: var(--gray);
}

.page-about .ab-cta__title {
  margin: 0;
  font-size: clamp(1.5rem, 4.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-cta__text {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg-dim);
}

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

/* 响应式 */
@media (min-width: 720px) {
  .page-about .ab-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .page-about .ab-mast__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 72px);
  }

  .page-about .ab-head {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--ab-gap);
    align-items: start;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .ab-split--flip .ab-split__text { order: 1; }
  .page-about .ab-split--flip .ab-media { order: 2; }

  .page-about .grid--split.ab-review {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(32px, 4vw, 64px);
  }

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

  .page-about .ab-tl__item { padding-right: clamp(16px, 2vw, 28px); }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 64px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-link,
  .page-about .tbl tbody tr {
    transition: none;
  }
}