.page-about {
  --about-rail: 196px;
  --about-gap: clamp(28px, 4vw, 56px);
  color: var(--slate-100);
  background:
    radial-gradient(1100px 560px at 86% -8%, rgba(200, 242, 79, .09), transparent 68%),
    radial-gradient(820px 460px at 2% 38%, rgba(73, 214, 232, .07), transparent 72%);
  padding-bottom: clamp(56px, 8vw, 112px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: 1px solid var(--line-600);
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 5vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__text .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero__text h1 {
  margin: 0 0 20px;
}

.page-about .about-hero__lead {
  max-width: 54ch;
  margin: 0 0 30px;
  color: var(--slate-400);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  border-left: 1px solid var(--line-600);
  padding-left: 12px;
}

.page-about .about-fact__num {
  display: block;
  color: var(--lime-400);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.01em;
}

.page-about .about-fact__unit {
  font-size: .58em;
  margin-left: 2px;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  color: var(--slate-400);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .about-hero__figure {
  margin: 0;
  align-self: end;
}

.page-about .about-hero__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  object-fit: cover;
  border: 1px solid var(--line-600);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding-top: clamp(36px, 5vw, 68px);
}

.page-about .about-index {
  display: none;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  color: var(--slate-400);
  font-size: 11px;
  letter-spacing: .18em;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-600);
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px 9px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--slate-400);
  font-size: 13.5px;
  line-height: 1.5;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index-list a .mono {
  color: var(--slate-400);
  font-size: 11px;
  opacity: .8;
}

.page-about .about-index-list a:hover {
  color: var(--lime-200);
  background: rgba(200, 242, 79, .05);
}

.page-about .about-index-list a.is-active {
  color: var(--lime-400);
  border-left-color: var(--lime-400);
  background: rgba(200, 242, 79, .06);
}

.page-about .about-index-list a.is-active .mono {
  color: var(--lime-400);
  opacity: 1;
}

.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 96px);
  min-width: 0;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section__head {
  max-width: 68ch;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-section__head .eyebrow {
  margin: 0 0 12px;
  color: var(--lime-400);
}

.page-about .about-section__head h2 {
  margin: 0 0 14px;
}

.page-about .about-section__intro {
  margin: 0;
  color: var(--slate-400);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-subhead {
  margin: 0 0 10px;
  color: var(--white);
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: .01em;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 46px);
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lime-400), rgba(73, 214, 232, .45) 58%, rgba(28, 48, 89, .2));
  opacity: .55;
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 38px;
  margin-bottom: 18px;
}

.page-about .about-tl-item:last-child {
  margin-bottom: 0;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--line-600);
  box-shadow: 0 0 0 4px rgba(28, 48, 89, .35);
  transition: border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-tl-item--now::before,
.page-about .about-tl-item:hover::before {
  border-color: var(--lime-400);
  box-shadow: 0 0 0 5px rgba(200, 242, 79, .12);
}

.page-about .about-tl-year {
  display: block;
  margin-bottom: 8px;
  color: var(--lime-400);
  font-size: 12.5px;
  letter-spacing: .16em;
}

.page-about .about-tl-card {
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(14, 30, 60, .74), rgba(8, 18, 39, .74));
  box-shadow: var(--shadow-panel);
  overflow: hidden;
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-tl-card:hover {
  border-color: rgba(200, 242, 79, .45);
  transform: translateY(-2px);
}

.page-about .about-tl-card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-card summary::after {
  content: "";
  margin-left: auto;
  align-self: center;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--lime-400);
  border-bottom: 1.5px solid var(--lime-400);
  transform: rotate(45deg);
  transition: transform .24s var(--ease);
}

.page-about .about-tl-card[open] summary::after {
  transform: rotate(-135deg);
}

.page-about .about-tl-badge {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid rgba(200, 242, 79, .38);
  border-radius: 999px;
  color: var(--lime-200);
  font-size: 11px;
  letter-spacing: .08em;
  white-space: nowrap;
}

.page-about .about-tl-title {
  color: var(--white);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .about-tl-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line-600);
  margin-top: 2px;
}

.page-about .about-tl-body p {
  margin: 14px 0 0;
  color: var(--slate-400);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .about-tl-body a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(73, 214, 232, .38);
}

.page-about .about-tl-body a:hover {
  color: var(--lime-200);
  border-bottom-color: var(--lime-200);
}

/* 越往下卡片越宽 */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line-600);
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  align-items: stretch;
}

.page-about .about-team-card {
  border: 1px solid var(--line-600);
  background: linear-gradient(180deg, rgba(14, 30, 60, .6), rgba(4, 7, 15, .6));
  padding: 20px;
}

.page-about .about-team-card .card-title {
  color: var(--white);
  font-size: 15px;
  margin: 0 0 10px;
}

.page-about .about-team-card p {
  margin: 0;
  color: var(--slate-400);
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-coverage__panel {
  border: 1px solid var(--line-600);
  background: linear-gradient(160deg, rgba(14, 30, 60, .78), rgba(4, 7, 15, .6));
  padding: 22px;
}

.page-about .about-coverage__text {
  margin: 0 0 12px;
  color: var(--slate-400);
  font-size: 14.5px;
  line-height: 1.82;
}

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

.page-about .about-coverage__text a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(73, 214, 232, .38);
}

.page-about .about-coverage__text a:hover {
  color: var(--lime-200);
  border-bottom-color: var(--lime-200);
}

.page-about .about-tags {
  margin-top: 16px;
  gap: 7px;
}

/* ---------- 内容互通 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  border-top: 1px solid var(--line-600);
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .about-partners__text p {
  margin: 0 0 14px;
  color: var(--slate-400);
  font-size: 15px;
  line-height: 1.85;
}

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

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-partners__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line-600);
  border-left: 2px solid var(--lime-400);
  border-radius: var(--radius-sm);
  background: rgba(8, 18, 39, .6);
  color: var(--slate-400);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-partners__list .mono {
  color: var(--lime-400);
  font-size: 17px;
  font-weight: 600;
}

/* ---------- 协作联络点 ---------- */
.page-about .about-regions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}

.page-about .about-regions__figure {
  margin: 0;
}

.page-about .about-regions__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line-600);
  object-fit: cover;
}

.page-about .about-regions__text p {
  margin: 0 0 14px;
  color: var(--slate-400);
  font-size: 15px;
  line-height: 1.85;
}

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

/* ---------- 取舍与偏好 ---------- */
.page-about .about-priorities {
  gap: 18px;
}

.page-about .about-priority {
  border-top: 2px solid var(--line-600);
  padding-top: 18px;
  transition: border-color .24s var(--ease);
}

.page-about .about-priority:hover {
  border-top-color: var(--lime-400);
}

.page-about .about-priority p {
  margin: 0;
  color: var(--slate-400);
  font-size: 14.5px;
  line-height: 1.82;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 54px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
  border: 1px solid rgba(255, 138, 43, .28);
  background:
    radial-gradient(520px 240px at 8% 0%, rgba(255, 138, 43, .14), transparent 70%),
    linear-gradient(160deg, rgba(14, 30, 60, .82), rgba(4, 7, 15, .72));
  padding: clamp(22px, 3vw, 30px);
}

.page-about .about-cta__text p {
  margin: 0;
  color: var(--slate-400);
  font-size: 14.5px;
  line-height: 1.8;
}

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

.page-about .about-cta__actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-coverage {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-regions {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-tl-item:nth-child(1) .about-tl-card { max-width: 74%; }
  .page-about .about-tl-item:nth-child(2) .about-tl-card { max-width: 79%; }
  .page-about .about-tl-item:nth-child(3) .about-tl-card { max-width: 84%; }
  .page-about .about-tl-item:nth-child(4) .about-tl-card { max-width: 89%; }
  .page-about .about-tl-item:nth-child(5) .about-tl-card { max-width: 94%; }
  .page-about .about-tl-item:nth-child(6) .about-tl-card { max-width: 100%; }

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

  .page-about .about-cta__actions {
    flex-wrap: nowrap;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (min-width: 1120px) {
  .page-about .about-figure {
    max-width: 78%;
    margin-left: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-card,
  .page-about .about-tl-card summary::after,
  .page-about .about-tl-item::before,
  .page-about .about-priority,
  .page-about .about-index-list a {
    transition: none;
  }

  .page-about .about-tl-card:hover {
    transform: none;
  }
}