.page-about {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(82px, 13vh, 158px) 0 clamp(30px, 6vh, 70px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -14% -28% auto -28%;
  height: 84%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 64% at 76% 8%, rgba(198, 255, 61, 0.13), transparent 64%),
    radial-gradient(46% 58% at 8% 0%, rgba(255, 122, 47, 0.1), transparent 68%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 6vh, 54px);
}

.page-about .crumb-item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .crumb-list > .crumb-item + .crumb-item {
  margin-left: 10px;
}

.page-about .crumb-list > .crumb-item + .crumb-item::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(30px, 7vw, 64px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.4vw, 68px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 16ch;
}

.page-about .about-hero .lede {
  margin: clamp(20px, 3.4vw, 28px) 0 0;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.78;
  color: rgba(242, 247, 244, 0.88);
  max-width: 54ch;
}

.page-about .hero-meta {
  margin: clamp(18px, 3vw, 26px) 0 0;
  color: var(--mist);
}

/* 章节目录 */
.page-about .hero-index {
  align-self: end;
}

.page-about .index-heading {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

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

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

.page-about .index-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 2px;
  color: rgba(242, 247, 244, 0.9);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.5;
  transition: color var(--fast) var(--ease), padding-left var(--fast) var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--lime);
  padding-left: 10px;
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  flex: none;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: clamp(58px, 11vh, 122px) 0;
  position: relative;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 10px, transparent 10px 22px);
}

.page-about .chapter-grid {
  display: grid;
  gap: clamp(20px, 4.6vw, 48px);
}

.page-about .chapter-side {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .chapter-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-about .chapter-rule {
  display: block;
  width: 96px;
  height: 1px;
  background: var(--steel);
  opacity: 0.5;
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.3vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 22ch;
}

.page-about .chapter-body {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 64ch;
}

.page-about .chapter-body p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.82);
}

.page-about .pull-quote {
  margin: clamp(12px, 2.6vw, 22px) 0;
  padding: 16px 0 16px 22px;
  border-left: 2px solid var(--lime);
  font-family: var(--font-editorial);
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.62;
  color: var(--paper);
}

/* 数据条 */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 10px;
}

.page-about .stat {
  background: var(--field);
  padding: 18px 16px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.2;
  color: var(--lime);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .stat-row--team {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(34px, 6vw, 64px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--line) 24%, var(--line) 100%);
  opacity: 0.75;
}

.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: clamp(34px, 6vw, 62px);
}

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

.page-about .tl-marker {
  grid-column: 1;
  grid-row: 1;
  width: 15px;
  height: 15px;
  margin-top: 7px;
  border: 1px solid var(--line);
  background: var(--ink);
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
}

.page-about .tl-marker::after {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--steel);
  transition: background var(--fast) var(--ease);
}

.page-about .tl-node--lead .tl-marker::after,
.page-about .tl-node:hover .tl-marker::after {
  background: var(--lime);
}

.page-about .tl-body {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.page-about .tl-stage {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .tl-title {
  font-family: var(--font-editorial);
  font-weight: 400;
  font-size: clamp(18px, 2.5vw, 25px);
  line-height: 1.42;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(242, 247, 244, 0.78);
  max-width: 52ch;
}

.page-about .tl-more {
  margin-top: 14px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  max-width: 52ch;
}

.page-about .tl-more summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
  padding: 2px 0;
}

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

.page-about .tl-more summary::after {
  content: " ＋";
}

.page-about .tl-more[open] summary::after {
  content: " －";
}

.page-about .tl-more summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .tl-more p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .tl-media {
  grid-column: 2;
  grid-row: 2;
  margin: 4px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .team-cell {
  background: var(--field);
  padding: clamp(22px, 3.4vw, 34px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--mid) var(--ease);
}

.page-about .team-cell:hover {
  background: var(--layer);
}

.page-about .team-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .team-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .team-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(242, 247, 244, 0.76);
}

.page-about .team-figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

/* ---------- 江苏本地化 ---------- */
.page-about .local-banner {
  margin: clamp(30px, 5.4vw, 58px) 0 0;
}

.page-about .local-points {
  display: grid;
  gap: clamp(20px, 3.4vw, 30px);
  margin-top: clamp(28px, 5vw, 46px);
}

.page-about .local-point {
  border-top: 2px solid var(--orange);
  padding-top: 16px;
}

.page-about .local-num {
  margin: 0 0 8px;
  color: var(--mist);
}

.page-about .local-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .local-text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.76;
  color: rgba(242, 247, 244, 0.76);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-item {
  display: grid;
  grid-template-columns: minmax(58px, auto) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-num {
  color: var(--lime);
  font-size: 15px;
}

.page-about .partner-text {
  font-size: 15.2px;
  line-height: 1.72;
  color: rgba(242, 247, 244, 0.82);
}

/* ---------- 长期运营 ---------- */
.page-about .commit-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .commit-item {
  background: var(--field);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .commit-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .commit-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(242, 247, 244, 0.78);
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  padding: clamp(56px, 10vh, 110px) 0 clamp(64px, 12vh, 128px);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(70% 100% at 82% 0%, rgba(198, 255, 61, 0.08), transparent 62%),
    var(--layer);
}

.page-about .outro-inner {
  max-width: 62ch;
}

.page-about .outro-eyebrow {
  margin: 0 0 14px;
  color: var(--orange);
}

.page-about .outro-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

.page-about .outro-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 247, 244, 0.8);
}

.page-about .outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .outro-foot {
  margin: clamp(22px, 4vw, 32px) 0 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .outro-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
}

.page-about .outro-link:hover,
.page-about .outro-link:focus-visible {
  border-bottom-color: var(--lime);
}

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

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

@media (min-width: 920px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(44px, 6vw, 90px);
    align-items: end;
  }

  .page-about .chapter-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    column-gap: clamp(40px, 6vw, 92px);
    align-items: start;
  }

  .page-about .chapter-side {
    position: sticky;
    top: 108px;
  }

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

  .page-about .tl-node--lead {
    grid-template-columns: 30px minmax(0, 1fr) minmax(0, 0.92fr);
    column-gap: 28px;
  }

  .page-about .tl-node--lead .tl-media {
    grid-column: 3;
    grid-row: 1;
    margin-top: 2px;
  }

  .page-about .local-points {
    gap: clamp(26px, 3.4vw, 44px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: clamp(120px, 16vh, 190px);
  }
}

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