.page-about {
  --about-rail-w: 196px;
  display: block;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 38px) 0 clamp(34px, 6vw, 68px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 100% at 6% -16%, rgba(139, 92, 246, 0.24), transparent 58%),
    radial-gradient(92% 88% at 104% 2%, rgba(43, 245, 208, 0.14), transparent 56%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -18%;
  width: 66%;
  height: 460px;
  background: linear-gradient(112deg, rgba(43, 245, 208, 0.16), rgba(139, 92, 246, 0.08) 58%, transparent 82%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(90deg, rgba(233, 241, 255, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(233, 241, 255, 0.035) 1px, transparent 1px);
  background-size: 130px 130px;
  -webkit-mask-image: radial-gradient(78% 72% at 72% 8%, #000 0%, transparent 76%);
  mask-image: radial-gradient(78% 72% at 72% 8%, #000 0%, transparent 76%);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 clamp(20px, 4vw, 34px);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(43, 245, 208, 0.5);
}

.page-about .about-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-hero .eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--grad-pulse);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 42em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 32px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 500;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--fog);
}

.page-about .about-hero__facts li:first-child .about-num {
  color: var(--cyan);
}

.page-about .about-num__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ---------- 版式骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: clamp(26px, 4vw, 48px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

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

/* ---------- 章节索引 ---------- */

.page-about .about-rail {
  position: relative;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .rail-title {
  display: none;
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .rail-link:hover {
  color: var(--fog);
  border-color: rgba(43, 245, 208, 0.5);
}

.page-about .rail-num {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 68px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    padding: 22px 0;
    overflow: visible;
  }

  .page-about .rail-title {
    display: block;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    white-space: normal;
  }

  .page-about .rail-item {
    position: relative;
    padding: 11px 0 11px 20px;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-item::after {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    width: 5px;
    height: 5px;
    margin-top: -2.5px;
    border-radius: 50%;
    background: var(--line);
    transition: background 0.24s ease, box-shadow 0.24s ease;
  }

  .page-about .rail-item:hover::after,
  .page-about .rail-item.is-active::after {
    background: var(--cyan);
    box-shadow: 0 0 0 4px rgba(43, 245, 208, 0.14);
  }

  .page-about .rail-link {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 0;
    border: 0;
    border-radius: 0;
    font-size: 13.5px;
  }

  .page-about .rail-link:hover {
    color: var(--fog);
  }
}

/* ---------- 章节通用 ---------- */

.page-about .about-block {
  padding-top: clamp(34px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-block + .about-block {
  margin-top: clamp(34px, 5vw, 56px);
}

.page-about .about-block__head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-block .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .section-title {
  position: relative;
  margin: 0;
  padding-left: 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 2px;
  background: var(--cyan);
  transition: width 0.24s ease;
}

.page-about .about-block:hover .section-title::before {
  width: 6px;
}

.page-about .about-prose p {
  margin: 16px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 245, 208, 0.35);
  transition: border-color 0.2s ease;
}

.page-about .about-prose a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 场景卡 ---------- */

.page-about .scene-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .scene {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-1);
}

.page-about .scene::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--grad-pulse);
  opacity: 0.85;
}

.page-about .scene h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fog);
}

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

@media (min-width: 720px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 图版 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 24px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-1);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 52%, rgba(5, 10, 24, 0.6));
}

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

/* ---------- 版本时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(43, 245, 208, 0.6), rgba(139, 92, 246, 0.55), rgba(28, 43, 71, 0.9));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30.5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .timeline__item--now::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(43, 245, 208, 0.14);
}

.page-about .timeline__ver {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .timeline__item--now .timeline__ver {
  color: var(--orange);
}

.page-about .timeline__title {
  margin: 7px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 字段筛选与表格 ---------- */

.page-about .map-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .chip {
  appearance: none;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .chip:hover {
  color: var(--fog);
  border-color: rgba(43, 245, 208, 0.55);
}

.page-about .chip.is-active,
.page-about .chip[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .map-scroll {
  margin-top: 16px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-1);
  -webkit-overflow-scrolling: touch;
}

.page-about .map-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .map-table caption {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-about .map-table th,
.page-about .map-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .map-table thead th {
  background: var(--ink-2);
  font-family: var(--font-data);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .map-table td {
  line-height: 1.68;
  color: var(--mist);
}

.page-about .map-table td:first-child {
  width: 26%;
}

.page-about .map-table td strong {
  display: block;
  font-family: var(--font-data);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--fog);
}

.page-about .map-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .map-table tbody tr:hover td {
  background: rgba(16, 30, 60, 0.55);
}

.page-about .map-table tr[hidden] {
  display: none;
}

.page-about .map-note {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 4px;
}

.page-about .team-lede {
  margin: 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .team-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .team-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .team-count {
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  line-height: 1.25;
  color: var(--cyan);
}

.page-about .team-role {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

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

.page-about .team-note {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--violet);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(16, 30, 60, 0.6);
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
    gap: clamp(24px, 3vw, 46px);
    align-items: start;
  }

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

/* ---------- 规模 ---------- */

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
}

.page-about .scale-cell {
  padding: 22px 18px;
  background: var(--ink-1);
}

.page-about .scale-value {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 500;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--fog);
}

.page-about .scale-value--accent {
  color: var(--cyan);
}

.page-about .scale-label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 主体信息 ---------- */

.page-about .record-list {
  margin: 4px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .record-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .record-row dt {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .record-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .record-row dd.data {
  font-family: var(--font-data);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

@media (min-width: 720px) {
  .page-about .record-row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  margin-top: clamp(38px, 5vw, 64px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(92% 130% at 100% 0%, rgba(139, 92, 246, 0.24), transparent 62%),
    radial-gradient(70% 100% at 0% 100%, rgba(43, 245, 208, 0.1), transparent 60%),
    var(--ink-1);
}

.page-about .about-cta .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

@media (max-width: 420px) {
  .page-about .about-cta__actions .btn {
    width: 100%;
    justify-content: center;
  }
}