.page-about {
  --about-hair: rgba(231, 180, 90, .22);
  --about-panel: rgba(18, 20, 28, .94);
  display: block;
}

.page-about .section {
  padding-top: clamp(48px, 6vw, 84px);
  padding-bottom: clamp(48px, 6vw, 84px);
}

.page-about .section-tight {
  padding-top: clamp(32px, 4vw, 56px);
  padding-bottom: clamp(48px, 6vw, 84px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 6px 0 clamp(48px, 6vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(115deg, rgba(231, 180, 90, .10) 0%, rgba(231, 180, 90, 0) 44%),
    linear-gradient(295deg, rgba(255, 61, 139, .14) 0%, rgba(7, 8, 12, 0) 56%),
    radial-gradient(120% 82% at 88% 0%, rgba(53, 230, 210, .13), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 60px;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(231, 180, 90, .16), rgba(7, 8, 12, 0));
  clip-path: polygon(0 46%, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--jade);
  text-shadow: 0 0 44px rgba(231, 180, 90, .22);
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero-rail {
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(27, 30, 40, .92), rgba(12, 14, 21, .68));
  padding: 20px 18px 14px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, .42);
}

.page-about .rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease;
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--jade);
  background: rgba(53, 230, 210, .10);
}

.page-about .rail-idx {
  min-width: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

/* ---------- 宽窄双栏 ---------- */
.page-about .about-spread {
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-aside {
  border-top: 2px solid var(--gold);
  padding-top: 16px;
  background: linear-gradient(180deg, rgba(231, 180, 90, .07), rgba(7, 8, 12, 0) 62%);
}

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

.page-about .prose p {
  margin: 0 0 18px;
  line-height: 1.8;
}

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

/* ---------- 关键切片 ---------- */
.page-about .slice-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .slice-item {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .slice-item:first-child {
  padding-top: 0;
}

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

.page-about .slice-num {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
  border-bottom: 3px solid var(--gold);
  padding-bottom: 6px;
}

.page-about .slice-label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-version-media {
  margin: 34px 0 10px;
}

.page-about .about-version-media img,
.page-about .about-team-media img,
.page-about .board-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.page-about .tl-list {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--cyan) 52%, var(--magenta));
  opacity: .55;
}

.page-about .tl-item {
  position: relative;
  padding-left: 54px;
}

.page-about .tl-marker {
  position: absolute;
  left: 0;
  top: 2px;
  display: grid;
  justify-items: center;
  gap: 5px;
}

.page-about .tl-idx {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--ink-900);
  background: var(--gold);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 0 0 1px var(--gold), 0 0 20px rgba(231, 180, 90, .35);
}

.page-about .tl-era {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .tl-panel {
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(6px);
  transition: border-color .2s ease, box-shadow .2s ease;
}

.page-about .tl-panel:hover {
  border-left-color: var(--gold);
}

.page-about .tl-panel[open] {
  border-left-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(53, 230, 210, .16), 0 18px 40px rgba(0, 0, 0, .45);
}

.page-about .tl-panel summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--jade);
}

.page-about .tl-panel summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-panel summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .tl-panel[open] summary::after {
  content: "–";
}

.page-about .tl-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--gold);
  letter-spacing: .08em;
}

.page-about .tl-body {
  padding: 0 16px 18px;
}

.page-about .tl-body p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tl-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .tl-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tl-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team-media {
  margin: 30px 0 0;
}

.page-about .glossary {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .glossary-row {
  border-left: 2px solid var(--line);
  padding-left: 12px;
}

.page-about .glossary dt {
  font-size: 14px;
  font-weight: 600;
  color: var(--jade);
}

.page-about .glossary dd {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 内容保障流程 ---------- */
.page-about .flow-list {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .flow-item {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(27, 30, 40, .88), rgba(12, 14, 21, .74));
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.page-about .flow-item::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  opacity: 0;
  transition: opacity .2s ease;
}

.page-about .flow-item:hover {
  transform: translateY(-4px);
  border-color: var(--line);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .5);
}

.page-about .flow-item:hover::before {
  opacity: 1;
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .flow-item h3 {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--jade);
}

.page-about .flow-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .inline-link-row {
  margin: 20px 0 0;
}

.page-about .link-cyan {
  color: var(--cyan);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 210, .42);
  padding-bottom: 2px;
  transition: border-color .18s ease, color .18s ease;
}

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

.page-about .coop-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .coop-item {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .coop-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .coop-val {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .coop-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 服务覆盖 ---------- */
.page-about .reach-grid {
  margin-top: 34px;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .reach-cell {
  padding: 24px 20px;
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--gold);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(231, 180, 90, .08), rgba(7, 8, 12, 0) 72%);
}

.page-about .reach-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--jade);
}

.page-about .reach-key {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .reach-cell p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .reach-note {
  margin: 26px 0 0;
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .reach-note .link-cyan {
  margin-left: 6px;
}

/* ---------- 事实速览板 ---------- */
.page-about .board-grid {
  margin-top: 30px;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .board-cell {
  display: grid;
  align-content: start;
  gap: 10px;
  min-height: 96px;
  padding: 18px 14px 20px;
  background: linear-gradient(170deg, rgba(18, 20, 28, .96), rgba(7, 8, 12, .96));
  transition: background-color .2s ease;
}

.page-about .board-cell:hover {
  background: linear-gradient(170deg, rgba(27, 30, 40, .96), rgba(12, 14, 21, .96));
}

.page-about .board-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .board-val {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--gold);
  overflow-wrap: anywhere;
}

.page-about .board-media {
  margin: 30px 0 0;
}

.page-about .board-media img {
  opacity: .5;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .18), #000 42%, #000 58%, rgba(0, 0, 0, .18));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .18), #000 42%, #000 58%, rgba(0, 0, 0, .18));
}

/* ---------- 收尾 ---------- */
.page-about .about-cta-box {
  padding: clamp(26px, 4vw, 52px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(231, 180, 90, .13), rgba(7, 8, 12, 0) 48%),
    linear-gradient(315deg, rgba(53, 230, 210, .15), rgba(7, 8, 12, 0) 54%),
    var(--ink-800);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta-box h2 {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.25;
  color: var(--jade);
}

.page-about .about-cta-box p {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero-rail {
    padding: 24px 20px 18px;
  }

  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .flow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .board-val {
    font-size: 22px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 56px;
    align-items: end;
  }

  .page-about .about-spread {
    grid-template-columns: minmax(0, 7.2fr) minmax(0, 3.4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 96px;
  }

  .page-about .tl-item {
    padding-left: 64px;
  }

  .page-about .tl-list::before {
    left: 23px;
  }

  .page-about .tl-idx {
    width: 48px;
    height: 48px;
    font-size: 14px;
  }
}

@media (min-width: 1080px) {
  .page-about .flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .board-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .board-cell {
    padding: 22px 18px 24px;
    min-height: 108px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-item,
  .page-about .board-cell,
  .page-about .rail-list a,
  .page-about .tl-panel {
    transition: none;
  }

  .page-about .flow-item:hover {
    transform: none;
  }
}