.page-about {
  --about-year-size: clamp(44px, 9vw, 96px);
  --about-radius: 14px;
}

/* 面包屑区域 */
.page-about .about-crumb {
  padding-top: clamp(84px, 13vw, 120px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: .06em;
  font-family: var(--font-mono);
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .breadcrumb-sep {
  color: var(--line);
}

.page-about .breadcrumb-current {
  color: var(--cream);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -110px;
  right: -70px;
  width: min(560px, 78vw);
  height: 340px;
  background: linear-gradient(135deg, rgba(200, 255, 61, .16), rgba(200, 255, 61, 0) 66%);
  transform: rotate(-12deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(260px, 42vw);
  height: 1px;
  background: linear-gradient(90deg, var(--lime), rgba(200, 255, 61, 0));
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  margin-top: clamp(16px, 3vw, 26px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(30px, 6.6vw, 64px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3.5vw, 30px);
}

/* 首屏右侧索引 */
.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--lime-dim);
}

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

.page-about .index-link {
  display: grid;
  gap: 3px;
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px var(--about-radius) 2px 2px;
  text-decoration: none;
  transition: border-color .2s var(--ease), transform .2s var(--ease), background-color .2s var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  border-color: var(--lime-dim);
  background: var(--panel-2);
  transform: translateX(4px);
}

.page-about .index-link-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .index-link-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* 章节头 */
.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-bottom: 14px;
  margin-bottom: clamp(22px, 4vw, 36px);
  border-bottom: 1px solid var(--line);
}

.page-about .section-head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .head-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 30em;
}

/* 三件事 */
.page-about .doing-grid {
  display: grid;
  gap: 16px;
}

.page-about .doing-card {
  position: relative;
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px 24px 2px 2px;
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .doing-card:hover {
  border-color: var(--lime-dim);
  transform: translateY(-4px);
}

.page-about .doing-card--cream {
  background: var(--cream);
  border-color: var(--cream);
  color: var(--char);
}

.page-about .doing-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .doing-card--cream .doing-index {
  color: var(--brick);
}

.page-about .doing-card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .doing-card--cream h3 {
  color: var(--char);
}

.page-about .doing-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .doing-card--cream p {
  color: #3a453f;
}

.page-about .doing-metric {
  margin-top: 16px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px !important;
  color: var(--sand) !important;
}

.page-about .doing-card--cream .doing-metric {
  border-top-color: rgba(16, 22, 19, .16);
  color: #4d5a52 !important;
}

.page-about .doing-card--cream .doing-metric .stat-num {
  color: var(--brick);
}

/* 时间线 */
.page-about .about-timeline-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .timeline {
  display: grid;
  gap: clamp(20px, 3.5vw, 36px);
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .rail-link {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .timeline-cards {
  display: grid;
  gap: 14px;
}

.page-about .tl-card {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: 2px 20px 2px 2px;
  scroll-margin-top: 130px;
  transition: border-left-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .tl-card:hover {
  border-left-color: var(--lime);
  background: var(--panel-2);
}

.page-about .tl-year {
  position: absolute;
  top: 2px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: var(--about-year-size);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.05em;
  color: var(--lime);
  opacity: .15;
  transform: rotate(-3deg);
  transform-origin: left top;
  pointer-events: none;
  user-select: none;
}

.page-about .tl-body {
  position: relative;
  padding-top: clamp(26px, 6vw, 48px);
}

.page-about .tl-body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3.5vw, 32px);
}

.page-about .team-lead {
  padding: clamp(20px, 3.4vw, 30px);
  background: linear-gradient(155deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: 2px 24px 2px 2px;
}

.page-about .team-lead-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(56px, 11vw, 88px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.04em;
  color: var(--lime);
}

.page-about .team-lead-key {
  margin: 6px 0 16px;
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  color: var(--sand);
}

.page-about .team-lead-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .team-lead-text strong {
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 17px;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-item {
  padding: 16px clamp(16px, 2.6vw, 22px);
  background: var(--ink);
}

.page-about .team-role {
  display: inline-block;
  margin-bottom: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--sand);
  border-radius: var(--radius-pill);
}

.page-about .team-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 数据来源 */
.page-about .data-grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
}

.page-about .data-figure {
  margin: 0;
}

.page-about .data-lede {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--cream);
}

.page-about .point-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .point {
  padding: 14px 16px;
  background: var(--panel);
  transition: background-color .2s var(--ease);
}

.page-about .point:hover {
  background: var(--panel-2);
}

.page-about .point dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--lime-dim);
  margin-bottom: 5px;
}

.page-about .point dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .point dd .stat-num {
  color: var(--sand);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .data-more {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-dim);
  padding-bottom: 1px;
}

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

/* 覆盖 */
.page-about .reach-grid {
  display: grid;
  gap: 16px;
}

.page-about .reach-stat,
.page-about .reach-regions,
.page-about .reach-service {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: 2px 20px 2px 2px;
  background: var(--panel);
}

.page-about .reach-stat {
  background: linear-gradient(160deg, #123F32, #08231C 78%);
  border-color: var(--lime-dim);
}

.page-about .reach-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(44px, 8.6vw, 68px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--lime);
}

.page-about .reach-unit {
  font-size: .4em;
  margin-left: 4px;
  color: var(--sand);
  letter-spacing: 0;
}

.page-about .reach-key {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--sand);
}

.page-about .reach-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .reach-note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .reach-note .stat-num {
  color: var(--sand);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .region-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .region-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .region-rank {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brick);
  letter-spacing: .08em;
}

.page-about .reach-big {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--sand);
}

.page-about .reach-service .btn {
  margin-top: 16px;
}

/* 资质与合作 */
.page-about .honor-grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 36px);
  align-items: start;
}

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

.page-about .honor-item {
  position: relative;
  padding: clamp(16px, 2.8vw, 22px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px 18px 2px 2px;
}

.page-about .honor-tag {
  display: inline-block;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--brick);
  border-radius: var(--radius-pill);
}

.page-about .honor-item h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .honor-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .honor-figure {
  margin: 0;
}

/* 结尾行动区 */
.page-about .about-cta {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(22px, 4vw, 40px);
  background: var(--cream);
  color: var(--char);
  display: grid;
  gap: 20px;
  align-items: center;
  border-radius: 2px 28px 2px 28px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 30px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--char);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: #3a453f;
}

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

.page-about .about-cta .btn--lime {
  background: var(--ink);
  color: var(--lime);
  border-color: var(--ink);
}

.page-about .about-cta .btn--lime:hover,
.page-about .about-cta .btn--lime:focus-visible {
  background: var(--panel-2);
  border-color: var(--panel-2);
  color: var(--lime);
}

.page-about .about-cta .btn--ghost {
  color: var(--char);
  border-color: rgba(16, 22, 19, .35);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  background: rgba(16, 22, 19, .08);
  border-color: var(--char);
}

/* 响应式：中屏起 */
@media (min-width: 720px) {
  .page-about .doing-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .doing-card:first-child {
    grid-column: 1 / -1;
  }
  .page-about .reach-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .reach-service {
    grid-column: 1 / -1;
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .page-about .cta-actions {
    justify-content: flex-end;
  }
}

/* 响应式：桌面 */
@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .82fr);
    align-items: start;
  }
  .page-about .about-index {
    border-top: 0;
    padding-top: 6px;
    border-left: 1px solid var(--line);
    padding-left: clamp(18px, 2.6vw, 28px);
  }
  .page-about .doing-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .doing-card:first-child {
    grid-column: auto;
  }
  .page-about .doing-card:nth-child(2) {
    transform: translateY(16px);
  }
  .page-about .doing-card:nth-child(2):hover {
    transform: translateY(12px);
  }
  .page-about .doing-card:nth-child(3) {
    transform: translateY(-10px);
  }
  .page-about .doing-card:nth-child(3):hover {
    transform: translateY(-14px);
  }
  .page-about .team-grid {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    align-items: start;
  }
  .page-about .data-grid {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
    align-items: center;
  }
  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }
  .page-about .reach-service {
    grid-column: auto;
    display: flex;
    flex-direction: column;
  }
  .page-about .reach-service .btn {
    margin-top: auto;
    align-self: flex-start;
  }
  .page-about .honor-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
  }
  .page-about .honor-figure {
    position: sticky;
    top: 120px;
  }
}

/* 响应式：宽屏，时间线左右分栏 */
@media (min-width: 960px) {
  .page-about .timeline {
    grid-template-columns: 118px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .timeline-rail {
    position: sticky;
    top: 118px;
  }
  .page-about .rail-list {
    flex-direction: column;
    gap: 16px;
    overflow: visible;
    padding: 0 0 0 16px;
    border-left: 1px solid var(--line);
  }
  .page-about .rail-title {
    padding-left: 16px;
  }
  .page-about .rail-link {
    position: relative;
    border: 0;
    padding: 0;
    background: none;
    border-radius: 0;
    color: var(--mist);
  }
  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -19px;
    top: 50%;
    width: 6px;
    height: 6px;
    margin-top: -3px;
    border-radius: 50%;
    background: var(--line);
    transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
  }
  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    color: var(--lime);
    background: none;
  }
  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--lime);
    box-shadow: 0 0 0 3px rgba(200, 255, 61, .22);
  }
  .page-about .tl-card:nth-child(odd) {
    margin-right: clamp(20px, 5vw, 56px);
  }
  .page-about .tl-card:nth-child(even) {
    margin-left: clamp(16px, 4vw, 44px);
  }
  .page-about .tl-card:nth-child(3n) {
    margin-left: clamp(28px, 7vw, 84px);
  }
}

/* 响应式：大桌面 */
@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    font-size: clamp(44px, 5.4vw, 68px);
  }
}

/* 动效退化 */
@media (prefers-reduced-motion: reduce) {
  .page-about .doing-card,
  .page-about .index-link,
  .page-about .tl-card,
  .page-about .rail-link::before {
    transition: none;
  }
  .page-about .tl-year {
    transform: none;
  }
}