.page-about {
  --about-pad: 20px;
  --about-soft: rgba(242, 247, 236, 0.78);
  --about-dim: rgba(242, 247, 236, 0.62);
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  padding-bottom: 56px;
  overflow-wrap: break-word;
}

.page-about .u-container {
  padding-inline: var(--about-pad);
}

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

.page-about .about-sec {
  padding-block: 44px;
}

.page-about .sec-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 640px;
  margin-bottom: 26px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 5.4vw, 40px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .sec-lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-soft);
  max-width: 56ch;
}

.page-about .breadcrumb {
  padding-top: 14px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-block: 18px 8px;
}

.page-about .hero-grid {
  display: grid;
  gap: 22px;
  align-items: end;
}

.page-about .hero-grid > * {
  min-width: 0;
}

.page-about .hero-frame {
  position: relative;
  border: 1px solid var(--line);
  padding: 24px 20px 26px;
  background:
    linear-gradient(158deg, rgba(14, 90, 58, 0.62), rgba(6, 35, 27, 0.28) 58%, rgba(7, 20, 38, 0.55));
}

.page-about .hero-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--volt);
  text-transform: uppercase;
}

.page-about .hero-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 8.6vw, 68px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 16px 0 0;
  color: var(--mist);
}

.page-about .hero-lead {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  margin: 24px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 96px;
}

.page-about .hero-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

.page-about .hero-fact-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--metal);
}

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

.page-about .hero-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  border-top: 1px solid var(--line-soft);
  padding-top: 40px;
}

.page-about .tl-layout {
  display: grid;
  gap: 26px;
}

.page-about .tl-index {
  border: 1px solid var(--line-soft);
  padding: 16px;
  background: rgba(7, 20, 38, 0.6);
}

.page-about .tl-index-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--metal);
  text-transform: uppercase;
}

.page-about .tl-index-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-about .tl-index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--about-soft);
  font-size: 12.5px;
  text-decoration: none;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.page-about .tl-index-link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--volt);
}

.page-about .tl-index-link:hover,
.page-about .tl-index-link:focus-visible {
  color: var(--mist);
  border-color: var(--line-volt);
}

.page-about .tl-figure {
  display: none;
  margin: 18px 0 0;
  border: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .tl-figure img {
  width: 100%;
  aspect-ratio: 1 / 1;
}

.page-about .tl-list {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .tl-node {
  border-top: 1px solid var(--line);
  scroll-margin-top: 84px;
}

.page-about .tl-node:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .tl-heading {
  margin: 0;
  font-weight: inherit;
}

.page-about .tl-trigger {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  padding: 18px 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .tl-ver {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--volt);
}

.page-about .tl-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 400;
  line-height: 1.3;
}

.page-about .tl-hint {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--moss);
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  white-space: nowrap;
}

.page-about .tl-trigger[aria-expanded="true"] .tl-hint {
  color: var(--volt);
  border-bottom-color: var(--line-volt);
}

.page-about .tl-trigger:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 4px;
}

.page-about .tl-inner {
  padding: 0 0 20px;
  max-width: 62ch;
}

.page-about .tl-inner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

/* ---------- 旧版资料 ---------- */
.page-about .about-legacy {
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(27, 42, 36, 0.55), rgba(6, 35, 27, 0));
}

.page-about .legacy-grid {
  display: grid;
  gap: 24px;
}

.page-about .legacy-grid > * {
  min-width: 0;
}

.page-about .legacy-lead {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .legacy-text {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .archive-label {
  margin: 22px 0 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--metal);
  text-transform: uppercase;
}

.page-about .archive-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

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

.page-about .legacy-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
}

.page-about .versus {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .vs-col {
  padding: 22px 20px;
  background: var(--graphite);
}

.page-about .vs-col--legacy {
  background: linear-gradient(170deg, rgba(255, 90, 60, 0.14), rgba(27, 42, 36, 0.95) 70%);
}

.page-about .vs-tag {
  margin: 0;
  display: inline-block;
}

.page-about .vs-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .vs-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .vs-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--volt);
}

.page-about .vs-col--legacy .vs-list li::before {
  background: var(--ember);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--line-soft);
}

.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  padding: 22px 20px;
  background: var(--graphite);
  min-width: 0;
}

.page-about .team-id {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--volt);
}

.page-about .team-name {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
}

.page-about .team-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  border-top: 1px solid var(--line-soft);
}

.page-about .stat-strip {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-cell {
  padding: 22px 20px;
  background: var(--night);
  min-width: 0;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 8vw, 50px);
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

.page-about .stat-label {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--metal);
}

/* ---------- 地域 ---------- */
.page-about .about-region {
  border-top: 1px solid var(--line-soft);
}

.page-about .region-panel {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .region-main {
  padding: 26px 20px;
  background: var(--pitch);
  min-width: 0;
}

.page-about .region-main .section-title {
  margin-top: 10px;
  color: var(--mist);
}

.page-about .eyebrow--on-pitch {
  color: var(--volt);
}

.page-about .region-text {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(242, 247, 236, 0.9);
  max-width: 52ch;
}

.page-about .region-text--small {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(242, 247, 236, 0.7);
}

.page-about .region-side {
  padding: 24px 20px;
  background: var(--graphite);
  min-width: 0;
}

.page-about .region-key {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--moss);
  text-transform: uppercase;
}

.page-about .region-value {
  margin: 6px 0 18px;
  font-size: 16px;
  color: var(--mist);
}

.page-about .region-value.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .region-side .btn {
  margin-top: 2px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-block: 32px 8px;
}

.page-about .cta-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-soft);
  max-width: 46ch;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about [id] {
  scroll-margin-top: 84px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-pad: 32px;
  }

  .page-about .about-sec {
    padding-block: 56px;
  }

  .page-about .hero-frame {
    padding: 30px 28px 32px;
  }

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

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

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

  .page-about .legacy-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 28px;
  }

  .page-about .tl-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .tl-index-list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .tl-index-link {
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    padding: 10px 0;
    background: none;
  }

  .page-about .tl-index-link:hover,
  .page-about .tl-index-link:focus-visible {
    border-bottom-color: var(--line-volt);
  }

  .page-about .tl-figure {
    display: block;
  }

  .page-about .region-panel {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

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

@media (min-width: 1080px) {
  .page-about .about-sec {
    padding-block: 68px;
  }

  .page-about .hero-title {
    font-size: 72px;
  }

  .page-about .tl-name {
    font-size: 21px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-index-link {
    transition: none;
  }
}