/* ===== 平台总览 / page-about ===== */

.page-about {
  --ab-shadow: 6px 6px 0 rgba(4, 12, 24, .5);
  display: block;
}

/* ---------- 右侧固定章节索引 ---------- */
.page-about .ab-index {
  display: none;
}

.page-about .ab-index__title {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .ab-index__link {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 0 5px 9px;
  border-left: 1px solid var(--line);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .ab-index__link:hover {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* ---------- 面包屑 ---------- */
.page-about .ly-crumbs {
  margin-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  margin-top: 16px;
  padding: 26px 0 4px;
  border-top: 1px solid var(--line);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -30px;
  right: -10px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle at 65% 35%, rgba(43, 227, 210, .16), transparent 68%);
  pointer-events: none;
}

.page-about .ab-hero__title {
  margin: 10px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  letter-spacing: -.03em;
  font-size: clamp(34px, 9vw, 58px);
  line-height: 1.04;
  color: var(--text);
}

.page-about .ab-hero__sub {
  margin: 16px 0 0;
  max-width: 34ch;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(19px, 4.6vw, 26px);
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .ab-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-stats__item {
  background: var(--panel);
  padding: 15px 14px 17px;
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--mono);
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .ab-stats__num em {
  font-style: normal;
  font-size: 14px;
  color: var(--muted);
  margin-left: 2px;
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  margin-top: 54px;
  scroll-margin-top: 108px;
}

.page-about .ab-sec__head {
  max-width: 64ch;
}

.page-about .ab-sec__head h2 {
  margin: 9px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: -.02em;
  font-size: clamp(23px, 5.4vw, 33px);
  line-height: 1.28;
  color: var(--text);
}

.page-about .ab-sec__note {
  margin: 13px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-h3 {
  margin: 9px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .ab-text {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .ab-text strong {
  color: var(--text);
  font-weight: 700;
}

.page-about .ab-text--wide {
  max-width: 70ch;
}

.page-about .ab-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

.page-about .ab-inline-link:hover {
  color: var(--text);
  border-bottom-color: var(--coral);
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), rgba(43, 227, 210, .1));
}

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

.page-about .ab-tl__item + .ab-tl__item {
  margin-top: 10px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 19px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(43, 227, 210, .16);
}

.page-about .ab-tl__node {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--ab-shadow);
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-tl__node:hover {
  transform: translateY(-2px);
  border-color: var(--line-cyan);
}

.page-about .ab-tl__node[open] {
  border-color: var(--line-cyan);
}

.page-about .ab-tl__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-tl__year {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .05em;
  color: var(--cyan);
}

.page-about .ab-tl__name {
  flex: 1 1 auto;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .ab-tl__more {
  font-size: 12px;
  color: var(--muted);
  transition: color .16s var(--ease);
}

.page-about .ab-tl__node[open] .ab-tl__more {
  color: var(--coral);
}

.page-about .ab-tl__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
}

.page-about .ab-tl__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .ab-tl__body strong {
  color: var(--text);
  font-weight: 700;
}

.page-about .ab-arch {
  margin-top: 28px;
  border: 1px solid var(--line);
  box-shadow: var(--ab-shadow);
}

/* ---------- 图片通用 ---------- */
.page-about .ab-figure {
  margin: 0;
  border: 1px solid var(--line);
  box-shadow: var(--ab-shadow);
  overflow: hidden;
}

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

.page-about .ly-media__cap {
  padding: 10px 12px;
  background: var(--panel);
  border-top: 1px solid var(--line);
}

/* ---------- 栏目对照表 ---------- */
.page-about .ab-compare {
  margin-top: 30px;
}

.page-about .ab-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .ab-filters__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-filters__chip {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 15px;
  border: 1px solid var(--line-2);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .ab-filters__chip:hover {
  color: var(--text);
  border-color: var(--line-cyan);
}

.page-about .ab-filters__input:checked + .ab-filters__chip {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.page-about .ab-filters__input:focus-visible + .ab-filters__chip {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-about .ab-tablewrap {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow-x: auto;
  box-shadow: var(--ab-shadow);
}

.page-about .ab-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .ab-table__cap {
  text-align: left;
  padding: 12px 14px 0;
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .ab-table thead th {
  background: var(--paper);
  color: var(--ink);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: .03em;
  text-align: left;
  padding: 12px 14px;
  white-space: nowrap;
}

.page-about .ab-table tbody th,
.page-about .ab-table tbody td {
  text-align: left;
  vertical-align: top;
  padding: 14px;
  border-top: 1px solid var(--line);
}

.page-about .ab-table tbody th {
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.page-about .ab-table tbody td {
  color: var(--muted);
  line-height: 1.7;
}

.page-about .ab-table tbody tr:nth-child(even) th,
.page-about .ab-table tbody tr:nth-child(even) td {
  background: var(--panel-2);
}

.page-about .ab-table tbody tr {
  transition: opacity .18s var(--ease);
}

.page-about .ab-table .ly-mono {
  color: var(--text);
  font-size: 13.5px;
}

.page-about .ab-table__link {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

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

.page-about .ab-aud {
  display: inline-block;
  margin: 0 6px 5px 0;
  padding: 3px 9px;
  border: 1px solid var(--line-2);
  background: rgba(43, 227, 210, .07);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text);
  white-space: nowrap;
}

.page-about .ab-compare:has(#abf-media:checked) .ab-table tbody tr:not(.ab-row--media),
.page-about .ab-compare:has(#abf-fan:checked) .ab-table tbody tr:not(.ab-row--fan),
.page-about .ab-compare:has(#abf-study:checked) .ab-table tbody tr:not(.ab-row--study),
.page-about .ab-compare:has(#abf-org:checked) .ab-table tbody tr:not(.ab-row--org) {
  opacity: .2;
}

/* ---------- 团队与赛区 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .ab-split__col--rail {
  padding: 22px 18px 24px;
  border: 1px solid rgba(43, 227, 210, .22);
  background: linear-gradient(158deg, rgba(11, 59, 60, .9) 0%, rgba(16, 42, 68, .96) 66%);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-split__col--rail .ly-eyebrow {
  margin: 0;
}

.page-about .ab-bar {
  display: flex;
  height: 52px;
  margin-top: 24px;
  border: 1px solid var(--line-2);
  background: var(--panel-2);
}

.page-about .ab-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .ab-bar__seg--content {
  width: 42.857%;
  background: var(--cyan);
  color: var(--ink);
}

.page-about .ab-bar__seg--tech {
  width: 35.714%;
  background: var(--cold-2);
  color: var(--ink);
}

.page-about .ab-bar__seg--ops {
  width: 21.429%;
  background: var(--cold-3);
  color: var(--text);
}

.page-about .ab-bar__seg-num {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .ab-legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .ab-legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 11px;
  align-items: start;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .ab-legend b {
  color: var(--text);
  font-weight: 700;
}

.page-about .ab-dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
}

.page-about .ab-dot--a { background: var(--cyan); }
.page-about .ab-dot--b { background: var(--cold-2); }
.page-about .ab-dot--c { background: var(--cold-3); }

.page-about .ab-figure--map {
  margin-top: 20px;
}

/* ---------- 合作机构 ---------- */
.page-about .ab-coop {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-coop__card {
  position: relative;
  padding: 24px 18px 18px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(8, 25, 43, .18);
  box-shadow: 7px 7px 0 rgba(4, 12, 24, .5);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .ab-coop__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 5px;
  width: 34%;
  background: var(--coral);
  transition: width .22s var(--ease);
}

.page-about .ab-coop__card:hover {
  transform: translateY(-3px);
  box-shadow: 9px 9px 0 rgba(4, 12, 24, .58);
}

.page-about .ab-coop__card:hover::before {
  width: 100%;
}

.page-about .ab-coop__num {
  display: block;
  font-family: var(--mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--wine);
}

.page-about .ab-coop__title {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .ab-coop__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: #3B4A5C;
}

/* ---------- 交付节奏 ---------- */
.page-about .ab-cadence {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-cadence__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--panel);
  transition: background-color .16s var(--ease);
}

.page-about .ab-cadence__item:hover {
  background: var(--panel-2);
}

.page-about .ab-cadence__when {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .03em;
  color: var(--cyan);
}

.page-about .ab-cadence__what {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 结尾行动区 ---------- */
.page-about .ab-cta {
  margin-top: 34px;
  padding: 26px 20px 28px;
  border: 1px solid var(--line-2);
  background: linear-gradient(140deg, rgba(94, 28, 52, .78) 0%, rgba(16, 42, 68, .96) 62%);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-cta__text p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(233, 238, 244, .82);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-hero__sub {
    max-width: 40ch;
  }

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

  .page-about .ab-cadence__item {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }

  .page-about .ab-cta {
    padding: 32px 30px 34px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-hero {
    padding-top: 34px;
  }

  .page-about .ab-sec {
    margin-top: 72px;
  }

  .page-about .ab-timeline {
    padding-left: 44px;
  }

  .page-about .ab-timeline::before {
    left: 9px;
  }

  .page-about .ab-tl__item::before {
    left: -39px;
  }

  .page-about .ab-tl__sum {
    padding: 17px 20px;
  }

  .page-about .ab-tl__body {
    padding: 0 20px 20px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .ab-split__col--rail {
    padding: 26px 22px 28px;
  }

  .page-about .ab-cta {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 32px;
    padding: 34px 34px 36px;
  }

  .page-about .ab-cta__actions {
    margin-top: 0;
    flex: 0 0 auto;
  }
}

/* ---------- 宽屏固定索引 ---------- */
@media (min-width: 1440px) {
  .page-about .ab-index {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: fixed;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    width: 96px;
    padding: 14px 10px 14px 12px;
    border: 1px solid var(--line);
    background: rgba(8, 25, 43, .92);
  }

  .page-about .ab-index__title {
    margin-bottom: 8px;
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__node,
  .page-about .ab-tl__more,
  .page-about .ab-filters__chip,
  .page-about .ab-table tbody tr,
  .page-about .ab-table__link,
  .page-about .ab-inline-link,
  .page-about .ab-coop__card,
  .page-about .ab-coop__card::before,
  .page-about .ab-cadence__item,
  .page-about .ab-index__link {
    transition: none;
  }
}