.page-about {
  --about-flow-gap: clamp(40px, 6vw, 76px);
  --about-line: rgba(30, 58, 90, 0.55);
  display: block;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-hero .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

.page-about .about-hero .breadcrumb a {
  color: var(--c-steel);
  text-decoration: none;
  transition: color 240ms var(--ease-out);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--c-cyan);
}

.page-about .about-hero .breadcrumb .sep {
  margin: 0 9px;
  opacity: 0.55;
}

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

.page-about .about-hero__main {
  position: relative;
  overflow: hidden;
  min-width: 0;
  padding: clamp(22px, 3.2vw, 40px);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  background:
    radial-gradient(120% 150% at 0% 0%, rgba(22, 224, 212, 0.14), transparent 58%),
    radial-gradient(90% 120% at 100% 100%, rgba(90, 99, 255, 0.14), transparent 62%),
    linear-gradient(158deg, var(--c-ink) 0%, var(--c-ink-2) 100%);
}

.page-about .about-hero__main::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(22, 224, 212, 0.07) 0 1px,
    transparent 1px 7px
  );
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 72%);
}

.page-about .about-hero__main > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__main h1 {
  margin: 12px 0 16px;
  font-size: clamp(29px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-hero__main .lede {
  max-width: 40rem;
  margin: 0;
  color: var(--c-mist);
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.8;
}

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

.page-about .about-hero__side {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  align-content: start;
  min-width: 0;
}

.page-about .hero-chip {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  min-width: 0;
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 36, 64, 0.95), rgba(10, 29, 51, 0.95));
}

.page-about .hero-chip::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-cyan), transparent);
}

.page-about .hero-chip:nth-child(2)::before {
  background: linear-gradient(180deg, var(--c-violet), transparent);
}

.page-about .hero-chip:nth-child(3)::before {
  background: linear-gradient(180deg, var(--c-green), transparent);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  word-break: break-word;
}

.page-about .stat-label {
  display: block;
  font-size: 13px;
  line-height: 1.45;
  letter-spacing: 0.04em;
  color: var(--c-steel);
}

.page-about .hero-chip .stat-num {
  font-size: clamp(26px, 3vw, 34px);
}

.page-about .hero-chip:nth-child(2) .stat-num {
  color: var(--c-mist);
}

.page-about .hero-chip:nth-child(3) .stat-num {
  color: var(--c-green);
}

/* ---------- 侧边轨道 + 正文流 ---------- */

.page-about .about-body-wrap {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

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

.page-about .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-steel);
}

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

.page-about .rail-list li {
  flex: none;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--c-steel);
  text-decoration: none;
  transition: color 240ms var(--ease-out), border-color 240ms var(--ease-out),
    background-color 240ms var(--ease-out);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--c-mist);
  border-color: rgba(30, 58, 90, 0.78);
  background: var(--c-ink);
}

.page-about .rail-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  opacity: 0.9;
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-flow-gap);
  min-width: 0;
}

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 116px;
}

.page-about .about-section .section-title {
  margin: 8px 0 0;
  font-size: clamp(23px, 3.1vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-about .about-section .lede {
  max-width: 40rem;
  margin: 14px 0 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .about-prose {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.page-about .about-prose p {
  max-width: 42rem;
  margin: 0;
  font-size: 17px;
  line-height: 1.88;
  color: var(--c-mist);
}

/* ---------- 通用数据带 ---------- */

.page-about .metric-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--about-line);
  overflow: hidden;
}

.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 16px 18px;
  background: var(--c-ink);
}

.page-about .metric .stat-num {
  font-size: clamp(21px, 2.2vw, 27px);
}

.page-about .metric:nth-child(3n) .stat-num {
  color: var(--c-green);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--c-cyan) 0%,
    rgba(90, 99, 255, 0.7) 48%,
    rgba(30, 58, 90, 0.9) 78%,
    transparent 100%
  );
}

.page-about .timeline__item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 16px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 2px;
  top: 15px;
  width: 13px;
  height: 13px;
  border: 2px solid var(--c-cyan);
  border-radius: 50%;
  background: var(--c-deep);
  box-shadow: 0 0 0 4px rgba(22, 224, 212, 0.12);
}

.page-about .timeline__item--v2 .timeline__dot {
  border-color: var(--c-violet);
  box-shadow: 0 0 0 4px rgba(90, 99, 255, 0.14);
}

.page-about .timeline__item--v3 .timeline__dot {
  border-color: var(--c-green);
  box-shadow: 0 0 0 4px rgba(125, 240, 106, 0.14);
}

.page-about .timeline__summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 13px 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 36, 64, 0.95), rgba(10, 29, 51, 0.95));
  cursor: pointer;
  list-style: none;
  transition: border-color 240ms var(--ease-out);
}

.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__summary:hover {
  border-color: rgba(30, 58, 90, 0.85);
}

.page-about .timeline__summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-about .timeline__panel[open] > .timeline__summary {
  border-color: rgba(22, 224, 212, 0.5);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.page-about .timeline__title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .timeline__mark {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  margin-left: auto;
  border: 1px solid rgba(30, 58, 90, 0.78);
  border-radius: 6px;
}

.page-about .timeline__mark::before,
.page-about .timeline__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--c-cyan);
  transform: translate(-50%, -50%);
}

.page-about .timeline__mark::before {
  width: 10px;
  height: 1.5px;
}

.page-about .timeline__mark::after {
  width: 1.5px;
  height: 10px;
  transition: transform 180ms var(--ease-out);
}

.page-about .timeline__panel[open] .timeline__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .timeline__body {
  padding: 15px 17px 17px;
  border: 1px solid rgba(22, 224, 212, 0.4);
  border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  background: linear-gradient(180deg, rgba(13, 36, 64, 0.72), rgba(6, 21, 39, 0.78));
  animation: about-reveal 200ms var(--ease-out);
}

.page-about .timeline__body p {
  margin: 0 0 13px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--c-mist);
}

.page-about .about-points {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-points li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-steel);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 8px;
  height: 1.5px;
  background: var(--c-cyan);
}

@keyframes about-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 26px 0 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-figure--cover {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--team {
  aspect-ratio: 10 / 7;
}

.page-about .about-figure .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 26px 16px 11px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--c-mist);
  background: linear-gradient(180deg, transparent, rgba(6, 21, 39, 0.92));
}

/* ---------- 可查范围对比 ---------- */

.page-about .range-chart {
  display: grid;
  gap: 16px;
  margin: 22px 0 0;
  padding: 18px;
  list-style: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(13, 36, 64, 0.6);
}

.page-about .range-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  align-items: center;
  gap: 9px 14px;
}

.page-about .range-row__label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

.page-about .range-row__track {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(30, 58, 90, 0.7);
  overflow: hidden;
}

.page-about .range-row__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .range-row__fill--free {
  width: 46%;
  background: linear-gradient(90deg, var(--c-steel), rgba(138, 164, 192, 0.35));
}

.page-about .range-row__fill--member {
  width: 100%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-violet));
}

.page-about .range-row__note {
  grid-column: 1 / -1;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--c-steel);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .team-card {
  min-width: 0;
  padding: 20px 20px 22px;
  border: 1px solid var(--about-line);
  border-top-width: 2px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 36, 64, 0.92), rgba(10, 29, 51, 0.92));
  transition: border-color 240ms var(--ease-out), transform 240ms var(--ease-out);
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: rgba(30, 58, 90, 0.85);
}

.page-about .team-card:nth-child(1) {
  border-top-color: var(--c-cyan);
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--c-violet);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--c-orange);
}

.page-about .team-card h3 {
  margin: 13px 0 9px;
  font-size: 19px;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .team-card p {
  margin: 0 0 13px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- 覆盖分布 ---------- */

.page-about .reach-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(146px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.page-about .reach-item {
  min-width: 0;
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--c-cyan);
}

.page-about .reach-item:nth-child(2) {
  border-left-color: var(--c-green);
}

.page-about .reach-item:nth-child(3) {
  border-left-color: var(--c-orange);
}

.page-about .reach-item:nth-child(4) {
  border-left-color: var(--c-violet);
}

.page-about .reach-item .stat-num {
  font-size: clamp(20px, 2.1vw, 25px);
}

.page-about .reach-item:nth-child(2) .stat-num {
  color: var(--c-green);
}

.page-about .reach-item:nth-child(3) .stat-num {
  color: var(--c-orange);
}

.page-about .reach-item:nth-child(4) .stat-num {
  color: var(--c-mist);
}

/* ---------- 合作 ---------- */

.page-about .partner-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-item {
  display: grid;
  gap: 7px;
  min-width: 0;
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(13, 36, 64, 0.5);
  transition: border-color 240ms var(--ease-out);
}

.page-about .partner-item:hover {
  border-color: rgba(30, 58, 90, 0.85);
}

.page-about .partner-item__role {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .partner-item__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .honor-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px dashed rgba(125, 240, 106, 0.35);
  border-radius: var(--radius);
  background: rgba(125, 240, 106, 0.05);
}

.page-about .honor-strip p {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-steel);
}

/* ---------- 结尾 ---------- */

.page-about .about-outro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  overflow: hidden;
  background:
    radial-gradient(120% 170% at 100% 0%, rgba(90, 99, 255, 0.18), transparent 62%),
    linear-gradient(160deg, var(--c-ink), var(--c-deep));
}

.page-about .about-outro__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 2 / 1;
  overflow: hidden;
}

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

.page-about .about-outro__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: clamp(22px, 3.4vw, 38px);
}

.page-about .about-outro__body h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.7vw, 31px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-about .about-outro__body p {
  margin: 0;
  max-width: 34rem;
  font-size: 16px;
  line-height: 1.82;
  color: var(--c-mist);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .metric-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .range-row {
    grid-template-columns: 88px minmax(0, 1fr) minmax(0, 1.5fr);
  }

  .page-about .range-row__note {
    grid-column: auto;
  }
}

@media (min-width: 800px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .partner-item {
    grid-template-columns: 156px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    align-items: stretch;
    gap: 16px;
  }

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

  .page-about .about-outro {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .about-outro__figure {
    aspect-ratio: auto;
    height: 100%;
    min-height: 300px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .rail {
    position: sticky;
    top: 108px;
    padding-right: 6px;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-link {
    width: 100%;
    padding: 9px 12px;
    border-radius: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__body {
    animation: none;
  }

  .page-about .team-card,
  .page-about .timeline__mark::after {
    transition: none;
  }
}