.page-about {
  --about-rail-x: 27px;
  --about-rail-pad: 76px;
  --about-dot: 9px;
  --about-body-color: #cfe4d6;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4vh, 46px) 0 clamp(44px, 7vh, 84px);
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(90% 130% at 92% -12%, rgba(198, 255, 61, .16), transparent 62%),
    radial-gradient(70% 100% at -6% 12%, rgba(255, 92, 54, .12), transparent 60%);
}

.page-about .hero-slash {
  position: absolute;
  left: -8%;
  bottom: 6%;
  width: 120%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(198, 255, 61, .34), transparent);
  transform: rotate(-6deg);
  transform-origin: left center;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero .crumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .hero-title {
  margin: 12px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .hero-title em {
  display: block;
  margin-top: 6px;
  font-style: normal;
  color: var(--neon);
}

.page-about .hero-lede {
  margin-top: clamp(18px, 3vw, 28px);
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--about-body-color);
}

.page-about .hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--rule);
}

.page-about .hero-stats .stat {
  display: flex;
  align-items: baseline;
  gap: 4px;
  flex-wrap: wrap;
  min-width: 120px;
}

.page-about .hero-stats .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.2vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .hero-stats .stat-unit {
  font-size: 14px;
  color: var(--neon);
}

.page-about .hero-stats .stat-label {
  flex-basis: 100%;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 纵向刻度骨架 ---------- */
.page-about .about-body {
  position: relative;
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-rail {
  display: none;
}

.page-about .chapter {
  position: relative;
  padding-bottom: clamp(40px, 6vw, 76px);
  margin-bottom: clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--rule);
}

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

.page-about .chapter-no {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 9px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--neon);
  border: 1px solid rgba(198, 255, 61, .36);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--chalk);
}

.page-about .chapter-quote {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid rgba(198, 255, 61, .5);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.72;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .chapter-body {
  margin-top: 18px;
  max-width: 68ch;
}

.page-about .chapter-body p {
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-color);
}

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

.page-about .chapter-body strong {
  color: var(--neon);
  font-weight: 700;
}

.page-about .chapter-body a {
  color: var(--neon);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color .2s var(--ease);
}

.page-about .chapter-body a:hover {
  color: var(--amber);
}

/* ---------- 章节配图 ---------- */
.page-about .chapter-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

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

/* ---------- 双栏章节 ---------- */
.page-about .chapter-grid {
  margin-top: 22px;
}

.page-about .chapter-grid .chapter-body {
  margin-top: 0;
}

.page-about .chapter-aside {
  margin-top: 26px;
  padding: 20px 20px 22px;
  background: var(--turf);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
}

.page-about .aside-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .aside-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--about-body-color);
  border-bottom: 1px solid var(--rule);
}

.page-about .aside-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .aside-list--boxed {
  counter-reset: about-step;
}

.page-about .aside-list--boxed li {
  counter-increment: about-step;
}

.page-about .aside-list--boxed li::before {
  content: counter(about-step, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  padding-top: 4px;
}

.page-about .dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 9px;
  border-radius: 50%;
}

.page-about .dot--neon { background: var(--neon); }
.page-about .dot--amber { background: var(--amber); }
.page-about .dot--ember { background: var(--ember); }

/* ---------- 班次分栏 ---------- */
.page-about .shifts {
  position: relative;
  margin-top: clamp(24px, 3.6vw, 36px);
}

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

.page-about .shift-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid var(--rule);
  border-bottom: 0;
  background: var(--turf);
}

.page-about .shift-tab {
  flex: 1 1 auto;
  min-width: 92px;
  padding: 12px 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--mist);
  cursor: pointer;
  border-right: 1px solid var(--rule);
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .shift-tab:last-child {
  border-right: 0;
}

.page-about .shift-tab:hover {
  color: var(--chalk);
}

.page-about .shift-panels {
  border: 1px solid var(--rule);
  background: var(--ink);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .shift-panel {
  display: none;
}

.page-about .shift-panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body-color);
}

.page-about .shift-panel .shift-lead {
  margin-bottom: 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--chalk);
}

.page-about #shift-early:checked ~ .shift-bar label[for="shift-early"],
.page-about #shift-late:checked ~ .shift-bar label[for="shift-late"],
.page-about #shift-match:checked ~ .shift-bar label[for="shift-match"] {
  color: var(--ink);
  background: var(--neon);
}

.page-about #shift-early:checked ~ .shift-panels .shift-panel[data-panel="early"],
.page-about #shift-late:checked ~ .shift-panels .shift-panel[data-panel="late"],
.page-about #shift-match:checked ~ .shift-panels .shift-panel[data-panel="match"] {
  display: block;
}

.page-about .shift-radio:focus-visible ~ .shift-bar label {
  outline: none;
}

/* ---------- 团队区 ---------- */
.page-about .team-grid {
  margin-top: clamp(24px, 3.6vw, 38px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .team-figure {
  margin: 0;
}

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

.page-about .team-notes {
  padding: 20px 20px 22px;
  background: var(--turf);
  border: 1px solid var(--rule);
}

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

.page-about .team-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 10px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-body-color);
  border-bottom: 1px solid var(--rule);
}

.page-about .team-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .team-list .tag {
  flex: 0 0 auto;
  font-size: 12px;
  padding-top: 4px;
  color: var(--ember);
  letter-spacing: .08em;
}

/* ---------- 覆盖点阵 ---------- */
.page-about .reach-panel {
  margin-top: 26px;
  padding: 20px 18px 22px;
  background: var(--turf);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
}

.page-about .reach-map {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .reach-dot {
  fill: rgba(216, 242, 222, .28);
  transform-box: fill-box;
  transform-origin: center;
  transition: fill .18s var(--ease), transform .18s var(--ease);
  cursor: default;
}

.page-about .reach-dot--nation {
  fill: rgba(255, 194, 75, .42);
}

.page-about .reach-dot:hover {
  fill: var(--neon);
  transform: scale(1.55);
}

.page-about .reach-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  color: var(--mist);
}

.page-about .reach-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .reach-legend .dot {
  margin-top: 0;
}

.page-about .reach-legend b {
  color: var(--chalk);
  font-weight: 600;
}

/* ---------- 历程条带 ---------- */
.page-about .chapter--legacy {
  position: relative;
  padding: clamp(28px, 4vw, 44px) clamp(20px, 3.4vw, 40px) clamp(32px, 4.4vw, 48px);
  border: 1px solid var(--rule);
  border-bottom: 0;
  overflow: hidden;
  background: var(--turf);
  box-shadow: var(--shadow);
}

.page-about .chapter--legacy::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 26, 19, .88) 0%, rgba(7, 26, 19, .94) 60%, rgba(7, 26, 19, .98) 100%),
    linear-gradient(100deg, rgba(7, 26, 19, .9) 0%, rgba(14, 42, 31, .72) 100%);
  z-index: 0;
}

.page-about .legacy-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.7) brightness(.62);
  z-index: 0;
}

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

.page-about .legacy-list {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--rule);
}

.page-about .leg {
  border-bottom: 1px solid var(--rule);
}

.page-about .leg > summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 4px;
  list-style: none;
  cursor: pointer;
  transition: color .2s var(--ease);
}

.page-about .leg > summary::-webkit-details-marker {
  display: none;
}

.page-about .leg-year {
  flex: 0 0 auto;
  min-width: 76px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--neon);
}

.page-about .leg-name {
  flex: 1 1 auto;
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 600;
  color: var(--chalk);
}

.page-about .leg-mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  border: 1px solid var(--rule-strong);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .leg-mark::before,
.page-about .leg-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--mist);
  transform: translate(-50%, -50%);
  transition: background-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .leg-mark::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .leg[open] > summary .leg-mark {
  border-color: var(--neon);
  background: rgba(198, 255, 61, .12);
}

.page-about .leg[open] > summary .leg-mark::before,
.page-about .leg[open] > summary .leg-mark::after {
  background: var(--neon);
}

.page-about .leg[open] > summary .leg-mark::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-about .leg > summary:hover .leg-name {
  color: var(--neon);
}

.page-about .leg-body {
  padding: 0 4px 18px;
}

.page-about .leg-body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-body-color);
}

/* ---------- 收尾侧栏 ---------- */
.page-about .chapter-aside--tall {
  align-self: start;
}

@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .team-figure img {
    height: 100%;
  }
}

@media (min-width: 860px) {
  .page-about .chapter-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .chapter-grid .chapter-aside,
  .page-about .chapter-grid .reach-panel {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    padding-left: var(--about-rail-pad);
  }

  .page-about .about-rail {
    display: block;
    position: absolute;
    left: var(--about-rail-x);
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--rule-strong) 5%, var(--rule-strong) 92%, transparent);
  }

  .page-about .chapter::before {
    content: "";
    position: absolute;
    left: calc(var(--about-rail-x) - var(--about-rail-pad) - 4.5px);
    top: 8px;
    width: var(--about-dot);
    height: var(--about-dot);
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--neon);
    box-shadow: 0 0 0 4px rgba(198, 255, 61, .10);
  }

  .page-about .hero-lede {
    max-width: 58ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reach-dot,
  .page-about .leg-mark,
  .page-about .leg-mark::before,
  .page-about .leg-mark::after,
  .page-about .shift-tab {
    transition: none;
  }

  .page-about .hero-slash {
    transform: none;
  }
}