.page-about {
  --about-cut: 28px;
  --about-rail-w: 168px;
  background: var(--stand-white);
  color: var(--night-ink);
  overflow-x: clip;
}

.page-about .about-topline {
  padding-top: clamp(16px, 3vw, 32px);
}

.page-about .about-hero {
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero-lead .display {
  margin: 14px 0 0;
}

.page-about .about-lede {
  margin: clamp(20px, 2.5vw, 32px) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.3vw, 1.1875rem);
  line-height: 1.8;
  color: var(--concrete-700);
}

.page-about .about-hero-side {
  border-top: 2px solid var(--lemon);
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--concrete-300);
}

.page-about .about-stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2vw, 1.625rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.page-about .about-stat-label {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--concrete-500);
  text-align: right;
}

.page-about .about-hero-note {
  margin: 16px 0 0;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--concrete-500);
}

/* 分区骨架：左索引 右正文 */
.page-about .about-sec {
  border-top: 1px solid var(--concrete-100);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-top: 2px solid var(--night-ink);
  padding-top: 10px;
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-rail-label {
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--concrete-500);
}

.page-about .about-body > .h-section {
  margin: 0 0 clamp(20px, 2.5vw, 32px);
}

.page-about .prose {
  max-width: 38em;
}

.page-about .prose p {
  margin: 0 0 1.15em;
  color: var(--concrete-700);
}

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

/* 引语框景 */
.page-about .about-quote {
  margin: clamp(26px, 3.5vw, 44px) 0 0;
  padding: clamp(22px, 3vw, 34px) clamp(20px, 3vw, 36px);
  background: var(--concrete-100);
}

.page-about .about-quote-text {
  margin: 0;
  font-size: clamp(1.125rem, 1.9vw, 1.5rem);
  line-height: 1.6;
  font-weight: 600;
  color: var(--night-ink);
}

.page-about .about-quote-sign {
  display: block;
  margin: 14px 0 0;
  color: var(--concrete-500);
}

/* 图片与说明牌 */
.page-about .about-figure {
  margin: 0 0 clamp(24px, 3vw, 40px);
}

.page-about .about-figure--mid {
  margin: clamp(24px, 3vw, 40px) 0;
}

.page-about .about-figure--end {
  margin: clamp(32px, 4vw, 56px) 0 0;
  max-width: 900px;
}

.page-about .about-shot {
  background: var(--concrete-100);
  border: 1px solid var(--concrete-300);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  overflow: hidden;
}

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

.page-about .about-figure .placard {
  margin-top: 14px;
}

/* 团队分工 */
.page-about .about-crew {
  list-style: none;
  margin: clamp(26px, 3.5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--concrete-300);
}

.page-about .crew-item {
  background: var(--stand-white);
  padding: clamp(20px, 2.5vw, 28px) clamp(18px, 2.5vw, 30px);
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .crew-item:hover {
  background: var(--concrete-100);
  transform: translateY(-2px);
}

.page-about .crew-tag {
  display: inline-block;
  min-width: 26px;
  padding: 2px 6px;
  background: var(--night-ink);
  color: var(--lemon);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-align: center;
}

.page-about .crew-title {
  margin: 12px 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .crew-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--concrete-700);
}

/* 发展历程时间轴 */
.page-about .about-history {
  background: var(--concrete-100);
  border-top: 1px solid var(--concrete-300);
  border-bottom: 1px solid var(--concrete-300);
}

.page-about .about-history-head {
  max-width: 46em;
  margin-bottom: clamp(30px, 4vw, 52px);
}

.page-about .about-history-head .about-rail-num {
  display: inline-block;
  color: var(--concrete-500);
}

.page-about .about-history-head .h-section {
  margin: 10px 0 0;
}

.page-about .about-history-intro {
  margin: 16px 0 0;
  max-width: 34em;
  color: var(--concrete-700);
  line-height: 1.8;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--lemon) 0%, var(--concrete-300) 34%, var(--concrete-300) 100%);
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 clamp(26px, 3.5vw, 42px);
  max-width: 40em;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--lemon);
  transform: translateX(-4.5px);
  transition: transform 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before {
  background: var(--ember);
  transform: translateX(-4.5px) scale(1.35);
}

.page-about .tl-year {
  display: block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--concrete-500);
}

.page-about .tl-title {
  margin: 6px 0 8px;
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .tl-text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--concrete-700);
}

.page-about .tl-more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.3s var(--ease), opacity 0.24s var(--ease), margin 0.3s var(--ease);
  margin-top: 0;
}

.page-about .tl-more > p {
  margin: 0;
  overflow: hidden;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--concrete-500);
  border-left: 2px solid var(--lemon);
  padding-left: 0;
}

.page-about .tl-node:hover .tl-more,
.page-about .tl-node:focus-within .tl-more {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 12px;
}

.page-about .tl-node:hover .tl-more > p,
.page-about .tl-node:focus-within .tl-more > p {
  padding-left: 12px;
}

/* 合作生态 */
.page-about .about-intro {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 36em;
  line-height: 1.8;
  color: var(--concrete-700);
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .eco-item {
  --about-cut: 18px;
  background: var(--concrete-100);
  padding: 16px 20px 16px 18px;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  border-left: 3px solid var(--lemon);
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .eco-item:hover,
.page-about .eco-item:focus-within {
  background: var(--night-ink);
  transform: translateY(-2px);
}

.page-about .eco-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .eco-name {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: color 0.18s var(--ease);
}

.page-about .eco-item:hover .eco-name,
.page-about .eco-item:focus-within .eco-name {
  color: var(--lemon);
}

.page-about .eco-count {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--concrete-500);
  transition: color 0.18s var(--ease);
}

.page-about .eco-item:hover .eco-count,
.page-about .eco-item:focus-within .eco-count {
  color: var(--concrete-300);
}

.page-about .eco-desc {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.3s var(--ease), opacity 0.24s var(--ease), margin 0.3s var(--ease);
  margin-top: 0;
}

.page-about .eco-desc > span {
  overflow: hidden;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--concrete-500);
}

.page-about .eco-item:hover .eco-desc,
.page-about .eco-item:focus-within .eco-desc {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 10px;
}

.page-about .eco-item:hover .eco-desc > span,
.page-about .eco-item:focus-within .eco-desc > span {
  color: var(--concrete-300);
}

.page-about .about-links {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 38em;
  line-height: 1.8;
  color: var(--concrete-700);
}

.page-about .about-links a {
  color: var(--night-ink);
  text-decoration: none;
  box-shadow: inset 0 -0.55em 0 var(--lemon);
  transition: box-shadow 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  box-shadow: inset 0 -1.35em 0 var(--lemon);
}

/* 发布标准 */
.page-about .crit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--concrete-300);
}

.page-about .crit-item {
  background: var(--stand-white);
  padding: clamp(20px, 2.5vw, 30px) clamp(18px, 2.5vw, 32px);
  border-left: 3px solid transparent;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .crit-item:hover {
  border-left-color: var(--ember);
  background: var(--concrete-100);
}

.page-about .crit-num {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--concrete-500);
}

.page-about .crit-title {
  margin: 10px 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .crit-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--concrete-700);
  max-width: 36em;
}

/* 收尾 */
.page-about .about-cta-panel {
  background: var(--night-ink);
  color: var(--stand-white);
  padding: clamp(30px, 5vw, 64px) clamp(22px, 4vw, 60px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
}

.page-about .about-cta-panel .idx {
  color: var(--lemon);
}

.page-about .about-cta-panel .h-section {
  margin: 12px 0 0;
  color: var(--stand-white);
  max-width: 26em;
}

.page-about .about-cta-text {
  margin: 18px 0 0;
  max-width: 34em;
  line-height: 1.8;
  color: var(--concrete-300);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    border-top: 2px solid var(--lemon);
    position: sticky;
    top: calc(var(--header-space) + 12px);
    align-self: start;
  }

  .page-about .about-body {
    padding-bottom: clamp(8px, 2vw, 24px);
  }

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

  .page-about .eco-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .about-history .wrap {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-history-head {
    grid-column: 2;
    margin-bottom: clamp(24px, 3vw, 40px);
  }

  .page-about .about-timeline {
    grid-column: 2;
    padding-left: 34px;
  }

  .page-about .tl-node::before {
    left: -34px;
  }

  .page-about .about-figure--end {
    grid-column: 2;
  }
}

@media (min-width: 1240px) {
  .page-about .about-sec .about-body > .h-section {
    max-width: 22em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-item,
  .page-about .eco-item,
  .page-about .tl-node::before,
  .page-about .about-links a,
  .page-about .tl-more,
  .page-about .eco-desc {
    transition: none;
  }
}