.page-about {
  --idx-w: 172px;
  --gap-sm: clamp(12px, 1.6vw, 20px);
  --gap-md: clamp(18px, 2.4vw, 32px);
  --sec-gap: clamp(40px, 6vw, 80px);
  background: var(--bg);
  color: var(--body-text);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(200, 255, 61, .09) 0%, rgba(200, 255, 61, 0) 58%),
    var(--bg);
}

.page-about .about-hero-inner {
  padding-top: clamp(26px, 4.5vw, 56px);
  padding-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .crumbs a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

.page-about .about-hero-inner .eyebrow {
  margin-top: clamp(18px, 3vw, 34px);
  color: var(--lime);
}

.page-about .hero-title {
  margin: 14px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7.4vw, 92px);
  line-height: .97;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .hero-lede {
  max-width: 60ch;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: clamp(17px, 1.5vw, 19px);
  color: var(--body-text);
}

.page-about .hero-lede::first-letter {
  color: var(--white);
}

.page-about .about-hero-inner .btn-row {
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .hero-media {
  margin: 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--bg-2);
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: clamp(200px, 34vw, 480px);
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

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

.page-about .hs-item {
  background: var(--bg-2);
  padding: clamp(14px, 1.8vw, 22px) clamp(14px, 2vw, 24px);
}

.page-about .hs-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

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

.page-about .hs-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* ---------- 骨架布局 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-md);
  padding-top: clamp(30px, 5vw, 68px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

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

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  position: relative;
  border-top: 2px solid var(--line);
  padding-top: clamp(24px, 3.4vw, 44px);
  margin-top: var(--sec-gap);
}

.page-about .about-body > .about-sec:first-child {
  margin-top: 0;
  border-top: none;
  padding-top: 0;
}

.page-about .sec-head {
  position: relative;
  z-index: 1;
}

.page-about .sec-head .eyebrow {
  color: var(--lime);
}

.page-about .sec-title {
  margin: 10px 0 0;
  color: var(--white);
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  max-width: 24ch;
}

.page-about .lede {
  max-width: 62ch;
  margin: clamp(16px, 2vw, 24px) 0 0;
  color: var(--body-text);
  font-size: clamp(16px, 1.35vw, 18px);
}

.page-about .sec-foot {
  max-width: 62ch;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  font-size: 15px;
  color: var(--steel);
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .link-inline {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-2);
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .link-inline:hover {
  background: var(--lime);
  color: var(--bg);
}

.page-about .sec-fig {
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: clamp(48px, 8vw, 112px);
  line-height: .8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

/* ---------- 四类服务 ---------- */
.page-about .serve-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin-top: clamp(20px, 2.8vw, 32px);
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .serve-item {
  background: var(--bg-2);
  padding: clamp(16px, 2.2vw, 26px);
  transition: background-color 180ms var(--ease);
}

.page-about .serve-item:hover {
  background: var(--bg-3);
}

.page-about .serve-item h3 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .serve-item p {
  margin: 8px 0 0;
  font-size: 15px;
  color: var(--body-text);
  max-width: 46ch;
}

/* ---------- 年份跳转 ---------- */
.page-about .tl-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-top: clamp(20px, 2.6vw, 30px);
  border-bottom: 2px solid var(--line);
}

.page-about .tl-jump a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--steel);
  text-decoration: none;
  padding: 8px 14px;
  border: 2px solid transparent;
  border-bottom: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

/* ---------- 时间轴 ---------- */
.page-about .tl-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-md);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 34px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--bg);
  border: 2px solid var(--lime-2);
}

.page-about .tl-item:last-child::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-body h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 1.9vw, 22px);
  font-weight: 700;
  color: var(--white);
}

.page-about .tl-body p {
  margin: 6px 0 0;
  max-width: 52ch;
  font-size: 15px;
  color: var(--body-text);
}

/* ---------- 媒体框 ---------- */
.page-about .about-media {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--bg-2);
  align-self: start;
}

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

.page-about .about-media-cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 团队筛选 ---------- */
.page-about .filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  padding: 8px 14px;
  background: transparent;
  color: var(--body-text);
  border: 2px solid var(--line);
  cursor: pointer;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .filter-btn.is-current {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--bg);
}

.page-about .filter-item.is-hidden {
  display: none;
}

/* ---------- 团队三块 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-sm);
  margin-top: clamp(20px, 2.8vw, 32px);
}

.page-about .team-block {
  border: 2px solid var(--line);
  background: var(--bg-2);
  padding: clamp(18px, 2.4vw, 28px);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .team-block:hover {
  border-color: var(--lime);
  background: var(--bg-3);
}

.page-about .tb-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 5.6vw, 64px);
  line-height: .85;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .tb-role {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 1.9vw, 22px);
  font-weight: 700;
  color: var(--white);
}

.page-about .tb-text {
  margin: 8px 0 0;
  font-size: 15px;
}

.page-about .tb-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .tb-list li {
  position: relative;
  padding: 8px 0 8px 16px;
  font-size: 14px;
  color: var(--steel);
  border-bottom: 1px solid var(--line);
}

.page-about .tb-list li:last-child {
  border-bottom: none;
}

.page-about .tb-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 6px;
  background: var(--lime-2);
}

/* ---------- 数据能力 ---------- */
.page-about .cap-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-md);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .cap-text {
  min-width: 0;
}

.page-about .cap-text .lede {
  margin-top: 0;
}

.page-about .cap-list {
  list-style: none;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .cap-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cap-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--lime);
}

.page-about .cap-val {
  font-size: 15px;
  color: var(--body-text);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  list-style: none;
  margin: clamp(20px, 2.8vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .eco-cell {
  background: var(--bg-2);
  padding: clamp(18px, 2.2vw, 26px);
  min-height: 178px;
  display: flex;
  flex-direction: column;
  transition: background-color 180ms var(--ease);
}

.page-about .eco-cell:hover {
  background: var(--bg-3);
}

.page-about .eco-cell--accent {
  background: var(--bg-3);
}

.page-about .eco-count {
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .eco-cell--accent .eco-count {
  color: var(--orange);
}

.page-about .eco-name {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .eco-text {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--steel);
}

/* ---------- 服务与支持 ---------- */
.page-about .support-list {
  margin-top: clamp(20px, 2.8vw, 30px);
  border-top: 2px solid var(--line);
}

.page-about .support-list .data-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .support-list .data-val {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--white);
  word-break: break-word;
}

.page-about .support-notes {
  margin-top: clamp(20px, 2.6vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-sm);
}

.page-about .support-notes p {
  margin: 0;
  padding: clamp(14px, 1.8vw, 20px);
  background: var(--bg-2);
  border-left: 2px solid var(--lime-2);
  font-size: 15px;
  color: var(--body-text);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 700px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .cap-item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-block:nth-child(1) {
    grid-column: 1 / 5;
  }

  .page-about .team-block:nth-child(2) {
    grid-column: 5 / 10;
    margin-top: 44px;
  }

  .page-about .team-block:nth-child(3) {
    grid-column: 9 / 13;
    margin-top: 88px;
  }

  .page-about .tl-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .cap-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--idx-w) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 56px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 20px);
    align-self: start;
    border-left: 2px solid var(--line);
    padding-left: 16px;
  }

  .page-about .idx-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--steel);
  }

  .page-about .idx-list {
    list-style: none;
    margin: 12px 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .page-about .idx-link {
    display: block;
    font-size: 14px;
    line-height: 1.4;
    padding: 6px 0;
    color: var(--body-text);
    text-decoration: none;
    transition: color 160ms var(--ease), transform 160ms var(--ease);
  }

  .page-about .idx-link:hover,
  .page-about .idx-link:focus-visible {
    color: var(--lime);
    transform: translateX(4px);
  }

  .page-about .idx-note {
    display: block;
    margin-top: 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.6;
    color: var(--line);
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .sec-fig {
    display: none;
  }

  .page-about .hero-title {
    font-size: clamp(34px, 10vw, 44px);
  }

  .page-about .tl-jump a {
    padding: 6px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}