.page-about {
  --about-rail-w: 244px;
  --about-cell: #0E2B33;
  background: var(--bg);
  color: var(--text);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  opacity: .42;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(20, 11, 38, .52) 0%, rgba(20, 11, 38, .84) 46%, var(--bg) 100%),
    radial-gradient(110% 70% at 84% 4%, rgba(255, 46, 136, .26), transparent 62%),
    radial-gradient(90% 70% at 6% 96%, rgba(43, 227, 224, .22), transparent 60%);
}

.page-about .about-hero__veil::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43, 227, 224, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 227, 224, .07) 1px, transparent 1px);
  background-size: 74px 74px;
}

.page-about .about-hero__inner {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(38px, 7vw, 86px));
  padding-bottom: clamp(42px, 6vw, 78px);
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 6px 12px;
  border: 1px solid var(--line-cy);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .12em;
  color: var(--cy);
}

.page-about .about-hero__tag::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--mg);
}

.page-about .about-hero h1 {
  margin: clamp(16px, 2.4vw, 30px) 0 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: var(--fs-88);
  line-height: .96;
  letter-spacing: -.02em;
  text-shadow: 0 0 26px rgba(43, 227, 224, .3);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 62ch;
  font-size: var(--fs-17);
  line-height: 1.8;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: rgba(30, 18, 54, .66);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-hero__facts b {
  font-weight: 700;
  color: var(--hi);
}

/* ---------- 主栅格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 44px);
  padding-top: clamp(34px, 5vw, 70px);
  padding-bottom: clamp(56px, 7vw, 96px);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(42px, 6vw, 86px);
  min-width: 0;
}

/* ---------- 左侧档案栏 ---------- */
.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-mg);
}

.page-about .about-rail__cap {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-13);
  letter-spacing: .22em;
  color: var(--mg);
}

.page-about .rail-nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-about .rail-nav::-webkit-scrollbar {
  display: none;
}

.page-about .rail-nav a {
  display: flex;
  flex: 0 0 auto;
  align-items: baseline;
  gap: 10px;
  padding: 6px 10px;
  border-left: 2px solid transparent;
  font-size: var(--fs-14);
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .rail-nav a i {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: var(--fs-13);
  color: var(--cy);
}

.page-about .rail-nav a:hover {
  color: var(--text);
  border-left-color: var(--cy);
  background: rgba(43, 227, 224, .08);
}

.page-about .rail-scale {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .rail-scale a {
  padding: 2px 7px;
  border: 1px solid transparent;
  color: var(--muted);
  text-decoration: none;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .rail-scale a:hover {
  color: var(--hi);
  border-color: rgba(233, 255, 90, .45);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section + .about-section {
  padding-top: clamp(36px, 5vw, 64px);
  border-top: 1px solid var(--line);
}

.page-about .about-section__eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: var(--fs-24);
  letter-spacing: .04em;
  color: var(--cy);
}

.page-about .about-section__eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-cy), transparent);
}

.page-about .about-section h2 {
  margin: 0 0 clamp(16px, 2vw, 26px);
  font-family: var(--font-display);
  font-size: var(--fs-34);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-body > p {
  max-width: 72ch;
  margin: 0 0 1.1em;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--text);
}

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

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

.page-about .about-body a:hover {
  color: var(--hi);
  border-bottom-color: rgba(233, 255, 90, .6);
}

/* ---------- 三条动作线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-line {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background: var(--tier);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 3px;
  height: 56px;
  background: var(--cy);
}

.page-about .about-line:nth-child(2)::before {
  background: var(--mg);
}

.page-about .about-line:nth-child(3)::before {
  background: var(--hi);
}

.page-about .about-line:hover {
  border-color: var(--line-cy);
  transform: translateY(-3px);
}

.page-about .about-line__no {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .16em;
  color: var(--mg);
}

.page-about .about-line__when {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-line h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-24);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
}

.page-about .about-line > p:last-child {
  max-width: none;
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin: 0;
  padding: 4px 0 4px 22px;
  list-style: none;
  border-left: 1px solid var(--line-mg);
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-timeline__item {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--mg);
  box-shadow: 0 0 14px rgba(255, 46, 136, .75);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .18em;
  color: var(--cy);
}

.page-about .about-timeline__item h3 {
  margin: 6px 0 8px;
  font-family: var(--font-body);
  font-size: var(--fs-24);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .about-timeline__item p {
  max-width: 66ch;
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 团队四格 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-team__cell {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line);
  background: var(--tier);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-team__cell:hover {
  border-color: var(--line-cy);
  background: rgba(43, 227, 224, .07);
}

.page-about .about-team__no {
  position: absolute;
  right: 14px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .1em;
  color: var(--mg);
}

.page-about .about-team__cell h3 {
  margin: 0 0 10px;
  font-family: var(--font-body);
  font-size: var(--fs-24);
  font-weight: 800;
}

.page-about .about-team__cell p {
  max-width: none;
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.72;
  color: var(--text);
}

/* ---------- 数据块 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  background: var(--line);
  transition: border-color .2s var(--ease);
}

.page-about .about-stats:hover {
  border-color: var(--line-cy);
}

.page-about .about-stat {
  padding: clamp(18px, 2.2vw, 26px) clamp(16px, 2vw, 22px);
  background: var(--about-cell);
  transition: background-color .2s var(--ease);
}

.page-about .about-stat:hover {
  background: rgba(43, 227, 224, .1);
}

.page-about .about-stat__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-34);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cy);
}

.page-about .about-stat:nth-child(2n) .about-stat__num {
  color: var(--mg);
}

.page-about .about-stat:nth-child(4n) .about-stat__num {
  color: var(--hi);
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-stat__cap {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 折叠块与配图 ---------- */
.page-about .accordion {
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-figure {
  margin: clamp(24px, 3.2vw, 38px) 0 0;
}

.page-about .about-figure .frame {
  border: 1px solid var(--line);
  background: var(--tier);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
}

.page-about .about-figure .frame-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 入口卡片 ---------- */
.page-about .about-routes {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-route {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cy);
  background: rgba(30, 18, 54, .62);
  color: var(--text);
  text-decoration: none;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-route:nth-child(2) {
  border-top-color: var(--mg);
}

.page-about .about-route:nth-child(3) {
  border-top-color: var(--hi);
}

.page-about .about-route:hover {
  border-color: var(--line-cy);
  background: rgba(43, 227, 224, .09);
  transform: translateY(-3px);
}

.page-about .about-route__key {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-route h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-24);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .about-route p {
  max-width: none;
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-route__go {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .06em;
  color: var(--cy);
}

.page-about .about-route:hover .about-route__go {
  color: var(--hi);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.4vw, 74px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 16px);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 40px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .page-about .rail-nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-nav a {
    padding: 7px 12px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-routes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-team__cell,
  .page-about .about-stat,
  .page-about .about-route,
  .page-about .rail-nav a,
  .page-about .rail-scale a,
  .page-about .about-body a,
  .page-about .about-stats {
    transition: none;
  }

  .page-about .about-line:hover,
  .page-about .about-route:hover {
    transform: none;
  }
}