.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  overflow-x: clip;
}

.page-about .ab-h2 {
  margin: 0 0 14px;
  font-size: clamp(26px, 4.2vw, 44px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-lede {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 16px);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(18px, 3vw, 32px) 0 clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  left: 0;
  right: 0;
  height: 560px;
  background:
    radial-gradient(45% 58% at 26% 42%, rgba(139, 92, 246, 0.34), transparent 72%),
    radial-gradient(38% 50% at 76% 18%, rgba(255, 77, 141, 0.18), transparent 72%),
    radial-gradient(34% 44% at 54% 6%, rgba(59, 130, 246, 0.2), transparent 70%);
  pointer-events: none;
}

.page-about .ab-hero .dw-breadcrumb {
  position: relative;
  margin-bottom: clamp(24px, 5vw, 48px);
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.6vw, 66px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--paper);
  text-shadow: 0 0 34px rgba(139, 92, 246, 0.45);
}

.page-about .ab-hero__num {
  display: inline-block;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--orange);
  text-shadow: 0 0 22px rgba(255, 138, 43, 0.55);
}

.page-about .ab-hero__body p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .ab-hero__body p + p {
  color: var(--muted);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .ab-hero__stat dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .ab-hero__stat dd {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 600;
  color: var(--orange);
  line-height: 1.1;
}

.page-about .ab-unit {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  margin-left: 3px;
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 5fr 7fr;
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }
}

/* ---------- 时间线 ---------- */

.page-about .ab-road__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .ab-road__rail {
  display: none;
}

.page-about .ab-road__railnum {
  display: block;
  font-family: var(--mono);
  font-size: clamp(64px, 9vw, 116px);
  font-weight: 600;
  line-height: 0.88;
  color: var(--purple);
}

@supports (-webkit-text-stroke: 1px black) {
  .page-about .ab-road__railnum {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--purple);
  }
}

.page-about .ab-road__railtxt {
  display: block;
  margin-top: 16px;
  writing-mode: vertical-rl;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--lime);
}

@media (min-width: 900px) {
  .page-about .ab-road__grid {
    grid-template-columns: 4fr 8fr;
    align-items: start;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-road__rail {
    display: block;
    position: sticky;
    top: 100px;
    padding-top: 6px;
  }
}

.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(26px, 4vw, 40px);
}

.page-about .ab-jump a {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(163, 230, 53, 0.45) 55%, rgba(163, 230, 53, 0.06) 100%);
}

.page-about .ab-tl {
  position: relative;
  padding-bottom: clamp(32px, 5vw, 56px);
  scroll-margin-top: 96px;
}

.page-about .ab-tl:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 4px rgba(11, 8, 19, 0.95), 0 0 16px rgba(163, 230, 53, 0.55);
}

.page-about .ab-tl__year {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .ab-tl__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-tl__body {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 图片框 ---------- */

.page-about .ab-shot {
  margin: clamp(18px, 3vw, 26px) 0 0;
  border: var(--bw) solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: 8px 8px 0 0 rgba(23, 17, 40, 0.9);
}

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

.page-about .ab-shot figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .ab-shot--old img {
  filter: sepia(0.5) hue-rotate(212deg) saturate(1.15) contrast(1.02);
}

.page-about .ab-shot--tall {
  margin: 0;
  border-color: var(--purple);
}

/* ---------- 团队 ---------- */

.page-about .ab-crew__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .ab-crew__grid {
    grid-template-columns: 7fr 5fr;
    gap: clamp(32px, 5vw, 64px);
  }
}

.page-about .ab-folds {
  margin-top: clamp(6px, 2vw, 16px);
}

.page-about .ab-fold {
  margin-bottom: 12px;
  border: var(--bw) solid var(--line);
  border-radius: 8px;
  background: var(--ink-2);
  transition: border-color 0.24s var(--ease);
}

.page-about .ab-fold:hover,
.page-about .ab-fold[open] {
  border-color: var(--purple);
}

.page-about .ab-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

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

.page-about .ab-fold summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-fold[open] summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .ab-fold[open] summary {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-fold p {
  margin: 0;
  padding: 14px 16px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-crew__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--pink);
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
}

/* ---------- 版本 ---------- */

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

.page-about .ab-ver::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(58% 45% at 12% 0%, rgba(59, 130, 246, 0.16), transparent 70%);
  pointer-events: none;
}

.page-about .ab-ver .dw-container {
  position: relative;
}

.page-about .ab-ver__head {
  max-width: 76ch;
}

.page-about .ab-ver__cols {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .page-about .ab-ver__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .ab-vercard {
  padding: clamp(18px, 3vw, 26px);
  border: var(--bw) solid var(--line);
  border-radius: 10px;
  background: var(--ink-2);
}

.page-about .ab-vercard--act {
  border-color: var(--orange);
  background: linear-gradient(160deg, rgba(255, 138, 43, 0.14), rgba(23, 17, 40, 0.95) 60%);
}

.page-about .ab-vercard__title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 900;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ab-vercard p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .ab-vercard__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 9px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-vercard__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}

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

.page-about .ab-vercard__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 原则 ---------- */

.page-about .ab-rules__head {
  max-width: 72ch;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .ab-rulelist {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 680px) {
  .page-about .ab-rulelist {
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }
}

.page-about .ab-rule {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  border: var(--bw) solid var(--purple);
  border-radius: 10px;
  background: rgba(139, 92, 246, 0.05);
  transition: background 0.26s var(--ease), transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-about .ab-rule:hover,
.page-about .ab-rule:focus-visible {
  background: var(--purple);
  border-color: var(--purple);
  transform: translate(-3px, -3px);
  outline: none;
}

.page-about .ab-rule__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--orange);
  transition: color 0.24s var(--ease);
}

.page-about .ab-rule:hover .ab-rule__num,
.page-about .ab-rule:focus-visible .ab-rule__num {
  color: var(--ink);
}

.page-about .ab-rule__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--paper);
  transition: color 0.24s var(--ease);
}

.page-about .ab-rule__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  transition: color 0.24s var(--ease);
}

.page-about .ab-rule:hover .ab-rule__title,
.page-about .ab-rule:focus-visible .ab-rule__title,
.page-about .ab-rule:hover .ab-rule__body,
.page-about .ab-rule:focus-visible .ab-rule__body {
  color: var(--ink);
}

/* ---------- 合作 ---------- */

.page-about .ab-map {
  margin: 0 0 clamp(28px, 5vw, 48px);
  padding: clamp(14px, 3vw, 26px);
  border: var(--bw) solid var(--line);
  border-radius: 12px;
  background:
    radial-gradient(68% 90% at 50% 8%, rgba(59, 130, 246, 0.18), transparent 72%),
    var(--ink-2);
}

.page-about .ab-map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
}

.page-about .ab-map figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .ab-partner__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .ab-partner__grid {
    grid-template-columns: 7fr 5fr;
    gap: clamp(32px, 5vw, 64px);
  }
}

.page-about .ab-partner__body {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

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

.page-about .ab-partner__facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-fact {
  padding: 16px;
  border: var(--bw) solid var(--line);
  border-radius: 8px;
  background: var(--ink-2);
}

.page-about .ab-fact__k {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .ab-fact__v {
  display: block;
  font-family: var(--mono);
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 600;
  color: var(--orange);
  line-height: 1.1;
}

/* ---------- 收尾 ---------- */

.page-about .ab-close {
  position: relative;
  padding: clamp(44px, 7vw, 84px) 0;
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .ab-close::before {
  content: "";
  position: absolute;
  top: -40%;
  left: 50%;
  width: min(760px, 120%);
  height: 320px;
  transform: translateX(-50%);
  background: radial-gradient(50% 60% at 50% 50%, rgba(139, 92, 246, 0.32), transparent 72%);
  pointer-events: none;
}

.page-about .ab-close .dw-container {
  position: relative;
}

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

.page-about .ab-close__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-close__body {
  margin: 0 0 clamp(22px, 3vw, 30px);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rule,
  .page-about .ab-fold,
  .page-about .ab-jump a {
    transition: none;
  }

  .page-about .ab-rule:hover,
  .page-about .ab-rule:focus-visible {
    transform: none;
  }
}