.page-about {
  background: var(--bg);
  color: var(--text);
  overflow-x: clip;
}

.page-about .inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, .4);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 48px) 0 44px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(920px 340px at 78% 0%, rgba(198, 255, 61, .07), transparent 62%),
    radial-gradient(720px 320px at 6% 100%, rgba(255, 165, 59, .06), transparent 66%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 74, 63, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 74, 63, .5) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 100% at 24% 0%, #000 6%, transparent 74%);
  mask-image: radial-gradient(120% 100% at 24% 0%, #000 6%, transparent 74%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--fog);
}

.page-about .breadcrumb__link {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .breadcrumb__current {
  color: var(--fog);
}

.page-about .about-hero__kicker {
  margin: 26px 0 14px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 820px;
  font-size: clamp(28px, 5vw, 50px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 760px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-hero__tape {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-hero__tape li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 104px;
}

.page-about .about-hero__tape .num {
  font-family: var(--mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
  text-decoration: none;
}

.page-about .about-hero__tape li:nth-child(2) .num {
  color: var(--amber);
}

.page-about .about-hero__tape-label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--fog);
}

/* ---------- 主体布局 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-top: 42px;
  padding-bottom: 76px;
}

.page-about .about-rail {
  align-self: start;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .about-rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line-soft);
  list-style: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  border-radius: 2px;
  color: var(--mute);
  font-size: 14px;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text);
  border-left-color: var(--lime);
  background: rgba(198, 255, 61, .06);
}

.page-about .about-rail__link[data-active="true"] {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(198, 255, 61, .09);
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--fog);
}

.page-about .about-rail__link[data-active="true"] .about-rail__num {
  color: var(--amber);
}

.page-about .about-rail__foot {
  margin: 16px 0 0;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--fog);
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  padding: 40px 0 44px;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .chapter:first-child {
  padding-top: 4px;
  border-top: 0;
}

.page-about .chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 22px;
}

.page-about .chapter__num {
  flex: 0 0 auto;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--lime);
  opacity: .82;
}

.page-about .chapter__head-text {
  min-width: 0;
  padding-top: 4px;
}

.page-about .chapter__title {
  margin: 0 0 6px;
  font-size: clamp(21px, 3.2vw, 29px);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .chapter__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .chapter p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

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

.page-about .chapter .chapter__lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .chapter__media {
  margin: 0 0 24px;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  overflow: hidden;
  background: var(--panel);
}

.page-about .chapter__media--tight {
  margin-top: 26px;
  margin-bottom: 0;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .chapter__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.page-about .chapter__split-main {
  min-width: 0;
}

.page-about .chapter__split-media {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  overflow: hidden;
  background: var(--panel);
}

.page-about .chapter__split--reverse .chapter__split-main {
  order: 1;
}

/* ---------- 引文板 ---------- */

.page-about .quote-board {
  position: relative;
  margin: 26px 0 0;
  padding: 20px 22px 20px 26px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--lime);
  border-radius: 2px;
  outline: none;
  box-shadow: var(--shadow-soft);
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease), transform .18s var(--ease);
}

.page-about .quote-board:hover {
  transform: translateX(2px);
}

.page-about .quote-board:focus,
.page-about .quote-board:focus-visible {
  border-color: var(--amber);
  border-left-color: var(--amber);
  box-shadow: 0 0 0 2px rgba(255, 165, 59, .38), var(--shadow-soft);
}

.page-about .quote-board__text {
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .quote-board__text .num {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--lime);
  text-decoration: underline;
  text-decoration-color: rgba(198, 255, 61, .45);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

/* ---------- 内容分类标签 ---------- */

.page-about .cat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cat-list__item {
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mute);
  background: rgba(20, 52, 43, .5);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .cat-list__item:hover {
  border-color: var(--lime);
  color: var(--lime);
}

/* ---------- 数据带 ---------- */

.page-about .stat-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 26px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .stat-band__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--panel);
  transition: background-color .18s var(--ease);
}

.page-about .stat-band__cell:hover {
  background: var(--panel-2);
}

.page-about .stat-band__num {
  font-family: var(--mono);
  font-size: 23px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--lime);
}

.page-about .stat-band__num--amber {
  color: var(--amber);
}

.page-about .stat-band__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--fog);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: 22px 0 0;
  padding: 4px 0 4px 28px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), var(--line) 55%, var(--line-soft));
}

.page-about .timeline__node {
  position: relative;
  margin-bottom: 8px;
  padding: 12px 14px 14px;
  border: 1px solid transparent;
  border-radius: 3px;
  outline: none;
  transition: border-color .18s var(--ease), background-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 18px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--line);
  transition: border-color .18s var(--ease), background-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .timeline__node:hover,
.page-about .timeline__node:focus,
.page-about .timeline__node:focus-visible {
  border-color: var(--line);
  background: var(--panel);
  transform: translateX(2px);
}

.page-about .timeline__node:hover::before,
.page-about .timeline__node:focus::before,
.page-about .timeline__node:focus-visible::before {
  border-color: var(--lime);
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, .14);
}

.page-about .timeline__tag {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .timeline__node:hover .timeline__tag,
.page-about .timeline__node:focus .timeline__tag {
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 社群点阵 ---------- */

.page-about .community-map {
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  box-shadow: var(--shadow-soft);
}

.page-about .community-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .community-map__dots circle {
  fill: var(--lime);
}

.page-about .community-map__dots circle:nth-child(2n) {
  fill: var(--amber);
}

.page-about .community-map__pulse circle {
  fill: none;
  stroke: var(--lime);
  stroke-width: 1;
  opacity: .35;
}

.page-about .community-map__caption {
  margin: 14px 0 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--fog);
}

/* ---------- 服务条目 ---------- */

.page-about .pledge-list {
  display: flex;
  flex-direction: column;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
  list-style: none;
}

.page-about .pledge-list__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .pledge-list__num {
  margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--lime);
}

.page-about .pledge-list__num--amber {
  color: var(--amber);
}

.page-about .pledge-list__body {
  min-width: 0;
}

.page-about .pledge-list__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .pledge-list__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  border-top: 1px solid var(--line);
  padding: 52px 0 68px;
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg-deep) 100%);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.32;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .stat-band {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .pledge-list__item {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 780px) {
  .page-about .chapter__split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .92fr);
    gap: 30px;
  }

  .page-about .chapter__split--reverse {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.35fr);
  }

  .page-about .chapter__split--reverse .chapter__split-main {
    order: 2;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 62px;
    align-items: start;
    padding-top: 52px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    max-height: calc(100vh - var(--header-h) - 56px);
    overflow-y: auto;
  }

  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 68px);
  }
}

@media (max-width: 430px) {
  .page-about .stat-band {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__tape {
    gap: 14px 22px;
  }

  .page-about .about-hero__tape li {
    min-width: 84px;
  }

  .page-about .chapter__num {
    font-size: 26px;
  }
}