.page-about {
  --about-rail-w: 288px;
  --about-hair: rgba(242, 245, 242, 0.14);
  --about-gold-hair: rgba(227, 184, 92, 0.34);
  background: var(--ink);
  color: var(--paper);
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--chip);
  font-variant-numeric: tabular-nums;
}

.page-about .unit {
  font-size: 0.56em;
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .crumb-sep {
  color: var(--mist);
  margin: 0 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 44px) 0 52px;
  background:
    radial-gradient(120% 96% at 10% -10%, rgba(31, 122, 84, 0.62), transparent 62%),
    radial-gradient(72% 58% at 92% 4%, rgba(79, 209, 197, 0.14), transparent 62%),
    var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), 0 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(242, 245, 242, 0.035) 0 1px, transparent 1px 3px);
  pointer-events: none;
}

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

.page-about .hero-grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .display-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 7.4vw, 52px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-hero .eyebrow {
  color: var(--neon);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(242, 245, 242, 0.88);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 2px solid var(--about-gold-hair);
  background: rgba(10, 31, 24, 0.78);
  box-shadow: var(--shadow-hard);
}

.page-about .hero-facts li {
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-right: 2px solid var(--about-hair);
}

.page-about .hero-facts li:last-child {
  border-right: 0;
}

.page-about .hf-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--chip);
}

.page-about .hf-label {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 44px;
  padding: 26px 0 88px;
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 72px;
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  min-width: 0;
}

.page-about .sec-index {
  position: absolute;
  top: -22px;
  right: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(64px, 14vw, 118px);
  line-height: 1;
  color: rgba(242, 245, 242, 0.05);
  pointer-events: none;
  user-select: none;
}

.page-about .section-head {
  position: relative;
  max-width: 42em;
}

.page-about .section-head .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--chip);
}

.page-about .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(242, 245, 242, 0.78);
}

.page-about .card-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-section p {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 245, 242, 0.8);
}

.page-about .about-link {
  display: inline-block;
  color: var(--neon);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid rgba(79, 209, 197, 0.45);
  padding-bottom: 2px;
  transition: color 180ms ease, border-color 180ms ease;
}

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

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 40px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--chip) 0%, rgba(227, 184, 92, 0.2) 72%, rgba(227, 184, 92, 0) 100%);
}

.page-about .tl-node {
  position: relative;
  padding-bottom: 38px;
}

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

.page-about .tl-marker {
  position: absolute;
  left: -40px;
  top: 4px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--chip);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .tl-node-current .tl-marker {
  background: var(--chip);
  box-shadow: 0 0 0 4px rgba(227, 184, 92, 0.18);
}

.page-about .tl-year {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--chip);
  background: rgba(227, 184, 92, 0.09);
  border: 2px solid var(--about-gold-hair);
}

.page-about .tl-body p {
  margin: 0 0 10px;
  max-width: 38em;
}

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

.page-about .tl-media {
  margin: 18px 0 0;
  max-width: 560px;
  border: 2px solid var(--about-hair);
  box-shadow: var(--shadow-hard);
}

.page-about .media-frame {
  display: block;
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  display: block;
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  background: var(--carbon);
  border-top: 2px solid var(--about-hair);
}

/* ---------- 房间分区 ---------- */
.page-about .split-grid {
  display: grid;
  gap: 22px;
  margin-top: 32px;
}

.page-about .split-panel {
  position: relative;
  padding: 26px 24px 28px;
  border: 2px solid var(--about-hair);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(158deg, rgba(31, 122, 84, 0.34), rgba(10, 31, 24, 0.94) 68%);
}

.page-about .split-fresh {
  border-top: 6px solid var(--felt-bright);
}

.page-about .split-advanced {
  border-top: 6px solid var(--neon);
  background: linear-gradient(158deg, rgba(79, 209, 197, 0.16), rgba(17, 21, 26, 0.96) 68%);
}

.page-about .split-count {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 12px;
}

.page-about .split-count .num {
  font-size: clamp(32px, 8vw, 46px);
  line-height: 1;
}

.page-about .split-panel p {
  margin: 0 0 12px;
}

.page-about .split-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .split-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(242, 245, 242, 0.78);
}

.page-about .split-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--chip);
  transform: rotate(45deg);
}

/* ---------- 团队 ---------- */
.page-about .team-media {
  margin: 30px 0 26px;
  border: 2px solid var(--about-hair);
  box-shadow: var(--shadow-hard);
}

.page-about .team-grid {
  row-gap: 18px;
}

.page-about .team-card {
  padding: 22px 20px 24px;
  background: var(--carbon);
  border: 2px solid var(--about-hair);
  border-left: 6px solid var(--felt);
  box-shadow: var(--shadow-soft);
  transition: transform 180ms ease, box-shadow 180ms ease, border-left-color 180ms ease;
}

.page-about .team-card-wide {
  border-left-color: var(--chip-deep);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard);
  border-left-color: var(--chip);
}

.page-about .team-role {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(242, 245, 242, 0.76);
}

/* ---------- 合作展示带 ---------- */
.page-about .partner-band {
  display: grid;
  gap: 22px;
  margin-top: 32px;
}

.page-about .partner-media {
  border: 2px solid var(--about-gold-hair);
  box-shadow: var(--shadow-hard);
  background: var(--ink-deep);
}

.page-about .partner-track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 4px 4px 16px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .partner-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .partner-track::-webkit-scrollbar-thumb {
  background: var(--chip-deep);
}

.page-about .partner-track > * {
  flex: 0 0 clamp(214px, 64vw, 258px);
  scroll-snap-align: start;
}

.page-about .label-card {
  padding: 20px 18px;
  background: var(--carbon);
  border: 2px solid var(--about-gold-hair);
  box-shadow: var(--shadow-soft);
}

.page-about .label-key {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .label-value {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  line-height: 1.14;
  color: var(--chip);
}

.page-about .partner-note {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(242, 245, 242, 0.74);
}

/* ---------- 成果陈列 ---------- */
.page-about .award-grid {
  margin-top: 30px;
  row-gap: 18px;
}

.page-about .award-card {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(150deg, rgba(20, 82, 58, 0.42), rgba(10, 31, 24, 0.95) 72%);
  border: 2px solid var(--about-hair);
  box-shadow: var(--shadow-hard);
}

.page-about .award-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 4px;
  background: var(--chip);
}

.page-about .award-card .label-key {
  margin: 4px 0 10px;
}

.page-about .award-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 32px);
  line-height: 1.1;
  color: var(--chip);
}

.page-about .award-note {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(242, 245, 242, 0.76);
}

.page-about .award-card .about-link {
  margin-top: 14px;
  font-size: 14.5px;
}

/* ---------- 长期维护 ---------- */
.page-about #upkeep {
  padding: 34px 26px 36px;
  background: linear-gradient(140deg, rgba(31, 122, 84, 0.4), rgba(17, 21, 26, 0.94) 70%);
  border: 2px solid var(--about-gold-hair);
  box-shadow: var(--shadow-hard);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .upkeep-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 数据侧栏 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .rail-inner {
  padding: 22px 20px 24px;
  background: var(--carbon);
  border: 2px solid var(--about-gold-hair);
  box-shadow: var(--shadow-hard);
  border-top: 6px solid var(--chip);
}

.page-about .rail-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--chip);
}

.page-about .rail-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .rail-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 2px solid var(--about-hair);
}

.page-about .rail-item:last-child {
  border-bottom: 0;
}

.page-about .rail-label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .rail-value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 21px;
  line-height: 1;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .rail-value .num {
  color: var(--chip);
}

.page-about .rail-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 2px solid var(--about-hair);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-body {
    gap: 52px;
  }

  .page-about .split-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .partner-band {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .partner-media {
    height: 100%;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 66px) 0 72px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1fr) 272px;
    align-items: end;
    gap: 48px;
  }

  .page-about .hero-side {
    display: flex;
    flex-direction: column;
  }

  .page-about .hero-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .hero-facts li {
    border-right: 0;
    border-bottom: 2px solid var(--about-hair);
    padding: 16px 14px;
  }

  .page-about .hero-facts li:last-child {
    border-bottom: 0;
  }

  .page-about .hf-num {
    font-size: 27px;
  }

  .page-about .about-flow {
    gap: 88px;
  }

  .page-about .partner-band {
    grid-template-columns: 300px minmax(0, 1fr);
  }

  .page-about .partner-track > * {
    flex: 0 0 252px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    gap: 56px;
    align-items: start;
  }

  .page-about .rail-inner {
    position: sticky;
    top: calc(var(--header-h-scrolled) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}