.page-about {
  --about-rail: 190px;
  --about-paper-shadow: 0 18px 34px rgba(6, 13, 30, .45);
  background: var(--ink-900);
  color: var(--rock);
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about .about-hero {
  padding: clamp(16px, 3vw, 28px) 0 clamp(40px, 6vw, 88px);
  background:
    radial-gradient(120% 90% at 8% 0%, var(--cyan-12), transparent 62%),
    radial-gradient(90% 80% at 100% 6%, var(--violet-12), transparent 58%);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 30px);
  padding: 0;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: .04em;
  color: rgba(195, 202, 214, .7);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(62, 242, 214, .5);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .hero-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  background:
    linear-gradient(160deg, rgba(13, 24, 48, .92), rgba(6, 13, 30, .96));
}

.page-about .hero-frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(23, 39, 74, .9);
  pointer-events: none;
}

.page-about .frame-sweep {
  position: absolute;
  top: 0;
  left: -40%;
  width: 40%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-45), transparent);
  animation: about-sweep 8s linear infinite;
}

@keyframes about-sweep {
  0% { left: -40%; }
  100% { left: 110%; }
}

.page-about .hero-grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  padding: clamp(26px, 4vw, 56px) clamp(20px, 4vw, 52px);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .hero-copy h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 66px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .lede {
  margin: 0 0 26px;
  max-width: 46ch;
  font-family: var(--font-serif);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.75;
  color: rgba(195, 202, 214, .92);
}

.page-about .hero-tickets {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ticket-sm {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--ink-900);
  background: var(--cream);
  border: 1px solid rgba(201, 123, 90, .7);
  box-shadow: 3px 3px 0 rgba(201, 123, 90, .35);
}

.page-about .ticket-sm:nth-child(2) { transform: rotate(-1.2deg); }
.page-about .ticket-sm:nth-child(3) { transform: rotate(.9deg); }

.page-about .ticket-sm .mono {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--terracotta);
}

.page-about .hero-panel {
  align-self: start;
  padding: 22px 20px;
  border: 1px solid var(--ink-700);
  background: linear-gradient(180deg, rgba(23, 39, 74, .55), rgba(13, 24, 48, .35));
  backdrop-filter: blur(6px);
}

.page-about .panel-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--violet);
}

.page-about .panel-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
  margin: 0;
}

.page-about .panel-stats dt {
  font-size: 12.5px;
  color: rgba(195, 202, 214, .75);
  margin-bottom: 6px;
}

.page-about .panel-stats dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
  color: var(--cyan);
}

.page-about .stat-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
}

.page-about .stat-unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--rock);
}

.page-about .panel-foot {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(23, 39, 74, .9);
  font-size: 11.5px;
  color: rgba(195, 202, 214, .6);
}

.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .chapter-rail {
  order: -1;
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .18em;
  color: rgba(195, 202, 214, .55);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: rgba(195, 202, 214, .82);
  text-decoration: none;
  border: 1px solid var(--ink-700);
  border-left: 2px solid transparent;
  background: rgba(13, 24, 48, .5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cream);
  border-left-color: var(--cyan);
  background: rgba(23, 39, 74, .8);
}

.page-about .rail-num {
  font-size: 11px;
  color: var(--violet);
}

.page-about .about-sections {
  display: grid;
  gap: clamp(56px, 9vw, 120px);
  min-width: 0;
}

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

.page-about .section-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .section-sub {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(195, 202, 214, .82);
}

.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

/* 主张 */
.page-about .stance {
  padding: clamp(28px, 5vw, 56px) 0 clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--ink-700);
}

.page-about .stance-title {
  max-width: 20ch;
}

.page-about .stance-copy {
  max-width: 62ch;
  padding-left: clamp(0px, 3vw, 32px);
  border-left: 1px solid transparent;
}

.page-about .stance-copy p {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.85;
  color: rgba(195, 202, 214, .9);
}

.page-about .stance-lead {
  font-size: clamp(19px, 2.4vw, 23px) !important;
  line-height: 1.7 !important;
  color: var(--cream) !important;
}

.page-about .pull-quote {
  margin: clamp(32px, 6vw, 72px) 0 0;
  padding: clamp(24px, 4vw, 40px) clamp(20px, 4vw, 44px);
  font-family: var(--font-serif);
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.5;
  color: var(--cream);
  background: linear-gradient(120deg, rgba(164, 124, 255, .16), rgba(62, 242, 214, .08));
  border-left: 3px solid var(--amber);
}

.page-about .pull-quote cite {
  display: block;
  margin-top: 16px;
  font-size: 11.5px;
  font-style: normal;
  letter-spacing: .12em;
  color: rgba(244, 239, 228, .65);
}

/* 时间轴 */
.page-about .timeline-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1400 / 600;
}

.page-about .timeline-figure figcaption {
  padding: 10px 14px;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: rgba(195, 202, 214, .6);
  border-top: 1px solid var(--ink-700);
}

.page-about .timeline-scroll {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 82%);
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 12px;
  scroll-snap-type: x mandatory;
}

.page-about .tl-node {
  scroll-snap-align: start;
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--ink-700);
  background: linear-gradient(180deg, rgba(13, 24, 48, .8), rgba(6, 13, 30, .7));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan-28);
  box-shadow: 0 16px 30px rgba(6, 13, 30, .55);
}

.page-about .tl-mark {
  display: block;
  width: 12px;
  height: 12px;
  margin-bottom: 14px;
  background: var(--terracotta);
  box-shadow: 0 0 0 4px rgba(201, 123, 90, .18);
}

.page-about .tl-year {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  line-height: 1.4;
}

.page-about .tl-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(195, 202, 214, .82);
}

/* 团队 */
.page-about .team-layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1200 / 800;
}

.page-about .team-figure figcaption {
  padding: 10px 14px;
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(195, 202, 214, .55);
  border-top: 1px solid var(--ink-700);
}

.page-about .paper-stack {
  display: grid;
  gap: 16px;
}

.page-about .paper-card {
  padding: 22px 22px 24px;
  color: var(--ink-900);
  background: var(--cream);
  border: 1px solid rgba(201, 123, 90, .55);
  box-shadow: var(--about-paper-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .paper-card:nth-child(1) { transform: rotate(-1deg); }
.page-about .paper-card:nth-child(2) { transform: rotate(.8deg); }
.page-about .paper-card:nth-child(3) { transform: rotate(-.6deg); }

.page-about .paper-card:hover,
.page-about .paper-card:focus-within {
  transform: rotate(0deg) translateY(-4px);
  box-shadow: 0 24px 42px rgba(6, 13, 30, .55);
}

.page-about .paper-num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--terracotta);
}

.page-about .paper-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .paper-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(6, 13, 30, .78);
}

/* 资质 */
.page-about .cred-grid {
  display: grid;
  gap: 16px;
}

.page-about .cred-card {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--ink-700);
  border-top: 2px solid var(--violet);
  background: rgba(13, 24, 48, .62);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .cred-card:hover,
.page-about .cred-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--violet-45);
  background: rgba(23, 39, 74, .8);
}

.page-about .cred-index {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .14em;
  color: rgba(164, 124, 255, .85);
}

.page-about .cred-num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(44px, 6vw, 58px);
  line-height: 1;
  color: var(--cream);
}

.page-about .cred-title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-about .cred-text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(195, 202, 214, .8);
}

.page-about .cred-more {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(23, 39, 74, 1);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: rgba(195, 202, 214, .55);
  opacity: .55;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .cred-card:hover .cred-more,
.page-about .cred-card:focus-within .cred-more {
  opacity: 1;
  color: var(--amber);
}

/* 覆盖 */
.page-about .reach-layout {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .reach-copy p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(195, 202, 214, .85);
  max-width: 54ch;
}

.page-about .reach-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .reach-tags .tag {
  padding: 7px 13px;
  font-size: 13px;
  border-radius: 2px;
}

.page-about .reach-figure {
  position: relative;
  padding: 16px;
  border: 1px solid var(--ink-700);
  background:
    radial-gradient(80% 70% at 50% 40%, var(--cyan-08), transparent 70%),
    var(--ink-800);
}

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

.page-about .reach-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 14px;
  object-fit: cover;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--ink-700);
  opacity: .92;
}

/* 收束 */
.page-about .closing-section {
  padding-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--ink-700);
}

.page-about .closing-inner {
  padding: clamp(26px, 4vw, 52px);
  border: 1px solid var(--cyan-28);
  background:
    linear-gradient(135deg, rgba(62, 242, 214, .09), rgba(164, 124, 255, .1) 55%, rgba(255, 180, 58, .07));
}

.page-about .closing-title {
  max-width: 24ch;
}

.page-about .closing-text {
  margin: 0 0 26px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(195, 202, 214, .88);
}

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

.page-about .link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(23, 39, 74, .95);
}

.page-about .link-row a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .link-row a:hover,
.page-about .link-row a:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cyan);
}

.page-about .link-row .mono {
  font-size: 12px;
  color: var(--amber);
}

@media (min-width: 720px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, .9fr);
    align-items: start;
  }

  .page-about .paper-stack {
    gap: 20px;
  }

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

  .page-about .timeline-scroll {
    grid-auto-columns: minmax(0, 1fr);
    overflow-x: visible;
    padding-bottom: 0;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .rail-list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }

  .page-about .rail-link {
    width: 100%;
    border: 1px solid transparent;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 9px 10px;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-color: var(--ink-700);
    border-left-color: var(--cyan);
    background: rgba(13, 24, 48, .6);
  }

  .page-about .stance-copy {
    border-left-color: var(--ink-700);
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .team-figure {
    position: sticky;
    top: 110px;
  }

  .page-about .reach-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .reach-img {
    margin-top: 18px;
  }
}

@media (min-width: 1200px) {
  .page-about .hero-grid {
    padding: clamp(40px, 4vw, 64px) clamp(36px, 4vw, 64px);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .pull-quote {
    margin-left: clamp(0px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .frame-sweep { animation: none; }
  .page-about .tl-node,
  .page-about .paper-card,
  .page-about .cred-card,
  .page-about .rail-link,
  .page-about .link-row a {
    transition: none;
  }
  .page-about .tl-node:hover,
  .page-about .tl-node:focus-within,
  .page-about .paper-card:hover,
  .page-about .paper-card:focus-within,
  .page-about .cred-card:hover,
  .page-about .cred-card:focus-within {
    transform: none;
  }
}
</main>