.page-about {
  --ab-rail: 216px;
  --ab-gap: clamp(24px, 3.5vw, 48px);
  --ab-ink: #cddae4;
  --ab-line-soft: rgba(31, 74, 99, .9);
  background-color: var(--jn-night);
  color: var(--jn-paper);
  padding-bottom: clamp(48px, 7vw, 96px);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-crumb {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  padding-bottom: clamp(20px, 3vw, 32px);
}
.page-about .ab-crumb__link {
  color: var(--jn-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.page-about .ab-crumb__link:hover,
.page-about .ab-crumb__link:focus-visible {
  color: var(--jn-green);
  border-bottom-color: var(--jn-green);
}
.page-about .ab-crumb__sep { color: var(--jn-line); }
.page-about .ab-crumb__now { color: var(--jn-mint); }

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 36px) 0 clamp(36px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 84% 8%, rgba(53, 214, 164, .22), transparent 58%),
    radial-gradient(90% 70% at 4% 98%, rgba(255, 92, 56, .14), transparent 62%),
    var(--jn-night);
  border-bottom: 1px solid var(--jn-line);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--jn-grid-lines);
  opacity: .3;
  pointer-events: none;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -28%;
  width: 60%;
  height: 158%;
  background: linear-gradient(115deg, rgba(182, 245, 226, .16), rgba(53, 214, 164, .03) 58%, transparent);
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--ab-gap);
  align-items: center;
}
@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

.page-about .ab-hero__kicker {
  display: inline-block;
  margin: 0;
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--jn-green);
  padding: 6px 12px;
  border: 1px solid rgba(53, 214, 164, .45);
  border-radius: 999px;
  background: rgba(53, 214, 164, .08);
}

.page-about .ab-hero h1 {
  margin: 18px 0 0;
  font-family: var(--jn-font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: #fff;
  transform: skew(-3deg);
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(0.98rem, 1.35vw, 1.08rem);
  line-height: 1.85;
  color: var(--ab-ink);
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(20px, 3vw, 36px);
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px dashed rgba(157, 178, 194, .32);
}
.page-about .ab-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}
.page-about .ab-hero__fact dt {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--jn-mist);
}
.page-about .ab-hero__fact dd {
  margin: 0;
  font-family: var(--jn-font-mono);
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--jn-green);
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  border-radius: var(--jn-radius-lg);
  overflow: hidden;
  border: 1px solid rgba(53, 214, 164, .32);
  box-shadow: 0 28px 60px rgba(0, 0, 0, .5);
  background: linear-gradient(140deg, rgba(53, 214, 164, .3), rgba(10, 26, 41, .92));
  transform: rotate(-1.2deg);
}
.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .ab-hero__media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px 12px;
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--jn-mint);
  background: linear-gradient(to top, rgba(10, 26, 41, .94), transparent);
}

/* ---------- 主栅格 + 粘性索引 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: var(--ab-gap);
  padding-top: clamp(32px, 5vw, 64px);
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
  .page-about .ab-index {
    position: sticky;
    top: 100px;
  }
}

.page-about .ab-index {
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--jn-radius);
  background: linear-gradient(180deg, rgba(18, 46, 69, .92), rgba(10, 26, 41, .92));
  padding: 16px 14px;
  min-width: 0;
}
.page-about .ab-index__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--jn-line);
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--jn-mist);
}
.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}
@media (min-width: 1024px) {
  .page-about .ab-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
}
.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 10px;
  border-radius: 4px;
  border-left: 2px solid transparent;
  text-decoration: none;
  font-size: 13px;
  color: var(--jn-mist);
  transition: color .2s, background-color .2s, border-color .2s;
}
.page-about .ab-index__num {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  color: var(--jn-line);
  transition: color .2s;
}
.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible,
.page-about .ab-index__link[aria-current="true"] {
  color: #fff;
  background: rgba(53, 214, 164, .1);
  border-left-color: var(--jn-green);
}
.page-about .ab-index__link:hover .ab-index__num,
.page-about .ab-index__link[aria-current="true"] .ab-index__num {
  color: var(--jn-green);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-body { min-width: 0; }

.page-about .ab-sec {
  padding-block: clamp(30px, 4.5vw, 56px);
  border-top: 1px solid rgba(31, 74, 99, .85);
  scroll-margin-top: 92px;
}
.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.page-about .ab-sec__no {
  flex: none;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--jn-green);
  border: 1px solid rgba(53, 214, 164, .5);
  border-radius: 3px;
  padding: 2px 7px;
}
.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--jn-font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  line-height: 1.25;
  color: #fff;
  min-width: 0;
}

.page-about .ab-sec__intro {
  margin: 0 0 20px;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ab-ink);
}

.page-about .ab-sec p {
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ab-ink);
}
.page-about .ab-sec p:last-child { margin-bottom: 0; }

/* ---------- 01 起台 ---------- */
.page-about .ab-origin {
  display: grid;
  gap: 14px;
}
@media (min-width: 720px) {
  .page-about .ab-origin {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}
.page-about .ab-origin__year {
  margin: 0;
  font-family: var(--jn-font-mono);
  font-size: clamp(2.1rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--jn-orange);
}
.page-about .ab-origin__text { min-width: 0; }

/* ---------- 02 三条内容线 ---------- */
.page-about .ab-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-line {
  min-width: 0;
  display: grid;
  gap: 10px;
  padding: 18px 18px 18px 16px;
  border-radius: var(--jn-radius);
  border: 1px solid var(--ab-line-soft);
  border-left: 3px solid var(--jn-green);
  background: linear-gradient(100deg, rgba(18, 46, 69, .94), rgba(10, 26, 41, .55));
  transition: border-color .25s, transform .25s;
}
.page-about .ab-line:hover { border-left-color: var(--jn-mint); transform: translateX(3px); }

@media (min-width: 780px) {
  .page-about .ab-line {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    padding: 22px 24px;
  }
  .page-about .ab-line:nth-child(2) { margin-inline-start: 22px; }
  .page-about .ab-line:nth-child(3) { margin-inline-start: 44px; }
}

.page-about .ab-line__meta {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}
@media (min-width: 780px) {
  .page-about .ab-line__meta { flex-direction: column; gap: 6px; }
}
.page-about .ab-line__no {
  font-family: var(--jn-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--jn-orange);
}
.page-about .ab-line__tag {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--jn-mint);
  padding: 2px 8px;
  border: 1px solid rgba(182, 245, 226, .3);
  border-radius: 3px;
  background: rgba(182, 245, 226, .07);
  white-space: nowrap;
}
.page-about .ab-line__body { min-width: 0; }
.page-about .ab-line__title {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  font-weight: 700;
  line-height: 1.45;
  color: #fff;
}
.page-about .ab-line__body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink);
  margin-bottom: 8px;
}

/* ---------- 图片块 ---------- */
.page-about .ab-figure {
  margin: 22px 0 0;
  border-radius: var(--jn-radius);
  overflow: hidden;
  border: 1px solid var(--ab-line-soft);
  background: var(--jn-stand);
}
.page-about .ab-figure--side { margin-top: 0; }
.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-figure figcaption {
  padding: 10px 14px;
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--jn-mist);
  background: rgba(18, 46, 69, .92);
  border-top: 1px solid var(--jn-line);
}

/* ---------- 03 场馆协作网 ---------- */
.page-about .ab-network {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 78%);
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
@media (min-width: 900px) {
  .page-about .ab-network {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .ab-node {
  min-width: 0;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  border-radius: var(--jn-radius);
  border: 1px solid var(--ab-line-soft);
  border-top: 2px solid var(--jn-green);
  background: linear-gradient(180deg, rgba(18, 46, 69, .95), rgba(10, 26, 41, .78));
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.page-about .ab-node:hover,
.page-about .ab-node:focus-within {
  transform: translateY(-4px);
  border-color: rgba(53, 214, 164, .6);
  border-top-color: var(--jn-orange);
  box-shadow: 0 18px 34px rgba(0, 0, 0, .38);
}
.page-about .ab-node__no {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--jn-line);
}
.page-about .ab-node__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--jn-mint);
}
.page-about .ab-node__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ab-ink);
}
.page-about .ab-node__tags {
  list-style: none;
  margin: auto 0 0;
  padding: 8px 0 0;
  border-top: 1px dashed rgba(157, 178, 194, .28);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.page-about .ab-node__tags li {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  color: var(--jn-mist);
  padding: 2px 7px;
  border-radius: 3px;
  background: rgba(31, 74, 99, .55);
}

/* ---------- 04 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 22px;
  align-items: start;
}
@media (min-width: 860px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 32px;
  }
}
.page-about .ab-team__text { min-width: 0; }

.page-about .ab-split {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed rgba(157, 178, 194, .32);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}
.page-about .ab-split li {
  display: flex;
  align-items: baseline;
  gap: 7px;
  min-width: 0;
}
.page-about .ab-split b {
  font-family: var(--jn-font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1;
  color: var(--jn-green);
}
.page-about .ab-split span {
  font-size: 13px;
  color: var(--jn-mist);
}

/* ---------- 05 时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-tl__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 12px;
}
.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--jn-orange);
  box-shadow: 0 0 0 4px rgba(255, 92, 56, .16);
  z-index: 1;
}
.page-about .ab-tl__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 30px;
  bottom: -2px;
  width: 2px;
  background: linear-gradient(180deg, rgba(53, 214, 164, .7), rgba(53, 214, 164, .12));
}
.page-about .ab-tl__item:last-child::after { display: none; }

.page-about .ab-tl__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  list-style: none;
  cursor: pointer;
  padding: 13px 16px;
  border-radius: var(--jn-radius);
  border: 1px solid var(--ab-line-soft);
  background: linear-gradient(100deg, rgba(18, 46, 69, .92), rgba(10, 26, 41, .5));
  transition: border-color .2s, background-color .2s;
}
.page-about .ab-tl__sum::-webkit-details-marker { display: none; }
.page-about .ab-tl__sum:hover,
.page-about .ab-tl__sum:focus-visible {
  border-color: rgba(53, 214, 164, .6);
  background: linear-gradient(100deg, rgba(18, 46, 69, 1), rgba(10, 26, 41, .65));
}
.page-about .ab-tl__year {
  font-family: var(--jn-font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--jn-green);
}
.page-about .ab-tl__name {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}
.page-about .ab-tl__cue {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--jn-mist);
}
.page-about .ab-tl__cue::before {
  content: "+";
  font-size: 15px;
  line-height: 1;
  color: var(--jn-green);
  transition: transform .22s;
}
.page-about .ab-tl details[open] .ab-tl__cue::before { transform: rotate(45deg); }

.page-about .ab-tl__body {
  padding: 12px 16px 2px;
  border-left: 2px solid rgba(53, 214, 164, .35);
  margin: 6px 0 0 4px;
}
.page-about .ab-tl__body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink);
}

/* ---------- 06 规模数据 ---------- */
.page-about .ab-results {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--jn-radius);
  overflow: hidden;
}
.page-about .ab-results li {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px 18px;
  background: linear-gradient(180deg, rgba(18, 46, 69, .96), rgba(12, 33, 50, .96));
}
.page-about .ab-results b {
  font-family: var(--jn-font-mono);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--jn-mint);
}
.page-about .ab-results span {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--jn-mist);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(22px, 4vw, 36px);
  border-radius: var(--jn-radius-lg);
  border: 1px solid rgba(53, 214, 164, .35);
  background:
    radial-gradient(120% 140% at 90% 0%, rgba(255, 92, 56, .18), transparent 55%),
    linear-gradient(115deg, rgba(53, 214, 164, .16), rgba(18, 46, 69, .5));
  display: grid;
  gap: 18px;
}
@media (min-width: 780px) {
  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}
.page-about .ab-cta__text { min-width: 0; }
.page-about .ab-cta__text h3 {
  margin: 0 0 8px;
  font-size: clamp(1.15rem, 2.4vw, 1.42rem);
  font-weight: 800;
  line-height: 1.35;
  color: #fff;
}
.page-about .ab-cta__text p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink);
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .ab-cta__actions .jn-btn { white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-line:hover,
  .page-about .ab-node:hover,
  .page-about .ab-node:focus-within {
    transform: none;
  }
  .page-about .ab-tl__cue::before { transition: none; }
}