.page-about {
  --about-hair: rgba(185, 198, 210, 0.16);
  --about-panel: linear-gradient(160deg, rgba(23, 58, 82, 0.58), rgba(12, 34, 54, 0.88));
  --about-radius: 14px;
}

.page-about .about-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(18px, 4vw, 40px) var(--gutter) clamp(48px, 7vw, 96px);
}

/* 面包屑 */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  font-size: 13px;
  color: var(--paper-grey);
  margin-bottom: clamp(18px, 3vw, 30px);
}
.page-about .about-crumb a {
  color: var(--cyan-mist);
  text-decoration: none;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold);
}

/* 首屏拼贴 */
.page-about .about-hero {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  padding-bottom: clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--about-hair);
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(31px, 8.2vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--paper);
  margin: 0.3em 0 0;
  animation: about-rise 0.42s var(--ease) both;
}
.page-about .about-hero__lede {
  font-size: clamp(15px, 2.6vw, 17px);
  line-height: 1.85;
  color: var(--paper);
  margin: 0 0 14px;
}
.page-about .about-hero__note {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--paper-grey);
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--about-radius);
  overflow: hidden;
  animation: about-rise 0.5s var(--ease) 0.08s both;
}
.page-about .about-stats__item {
  background: var(--ink-800);
  padding: 14px 16px;
}
.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--paper-grey);
  margin-bottom: 6px;
}
.page-about .about-stats dd {
  margin: 0;
  font-size: 13px;
  color: var(--paper-grey);
}
.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 32px);
  color: var(--gold);
  margin-right: 4px;
}

/* 主体：索引 + 内容 */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(26px, 4.5vw, 52px);
}
.page-about .about-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 8px;
  overflow-x: auto;
}
.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.page-about .about-index__list a span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--gold);
  background: rgba(243, 182, 75, 0.1);
}
.page-about .about-index__meta {
  display: none;
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  letter-spacing: 0.06em;
  color: var(--paper-grey);
  padding-top: 14px;
  border-top: 1px solid var(--about-hair);
}
.page-about .about-index__meta strong {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 15px;
}

/* 章节 */
.page-about .about-sec {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
  padding-top: clamp(26px, 4.5vw, 52px);
  border-top: 1px solid var(--about-hair);
}
.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-sec__head {
  display: flex;
  gap: 14px;
  align-items: baseline;
  animation: about-rise 0.4s var(--ease) both;
}
.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 6.6vw, 50px);
  line-height: 0.86;
  color: var(--cyan);
  flex: none;
}
.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 4.4vw, 33px);
  line-height: 1.24;
  color: var(--paper);
  margin: 0;
}
.page-about .about-sec__body {
  display: grid;
  gap: 14px;
}
.page-about .about-sec__body > p {
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--paper);
  margin: 0;
}
.page-about .about-sub {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--gold-bright);
  margin: 0 0 12px;
}

/* 三条主线卡片 */
.page-about .about-lines {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}
.page-about .about-card {
  position: relative;
  padding: 18px 18px 18px 22px;
  border: 1px solid var(--about-hair);
  border-radius: var(--about-radius);
  background: var(--about-panel);
  box-shadow: var(--shadow);
}
.page-about .about-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: var(--cyan);
}
.page-about .about-card__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0 0 8px;
}
.page-about .about-card__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 8px;
}
.page-about .about-card p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-grey);
  margin: 0 0 10px;
}
.page-about .about-link {
  display: inline-block;
  font-size: 13.5px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold-bright);
  border-bottom-color: currentColor;
}

/* 图片 */
.page-about .about-figure {
  margin: 6px 0 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  border: 1px solid var(--about-hair);
  object-fit: cover;
  background: var(--ink-800);
}
.page-about .yg-media__caption {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--paper-grey);
}

/* 版本时间线 */
.page-about .about-scroll-hint {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-mist);
  margin: 0;
}
.page-about .about-tl {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 4px 2px 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}
.page-about .about-tl__node {
  flex: 0 0 158px;
  scroll-snap-align: start;
  position: relative;
  padding: 14px 12px 14px;
  border: 1px solid var(--about-hair);
  border-radius: 12px;
  background: var(--ink-800);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease),
    background 0.28s var(--ease);
}
.page-about .about-tl__node::after {
  content: "";
  position: absolute;
  top: 20px;
  right: 12px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.6;
  transition: opacity 0.28s var(--ease), box-shadow 0.28s var(--ease);
}
.page-about .about-tl__node:hover,
.page-about .about-tl__node:focus-visible {
  transform: translateY(-4px);
  border-color: var(--gold);
  background: var(--ink-700);
  outline: none;
}
.page-about .about-tl__node:hover::after,
.page-about .about-tl__node:focus-visible::after {
  opacity: 1;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(243, 182, 75, 0.18);
}
.page-about .about-tl__node--now {
  border-color: rgba(243, 182, 75, 0.55);
  background: linear-gradient(160deg, rgba(243, 182, 75, 0.14), rgba(12, 34, 54, 0.9));
}
.page-about .about-tl__ver {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--gold);
  letter-spacing: 0.02em;
}
.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan-mist);
  margin: 4px 0 8px;
}
.page-about .about-tl__text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-grey);
  margin: 0;
}

/* 覆盖网格 */
.page-about .about-map__wrap {
  margin-top: 4px;
}
.page-about .about-map__note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--paper-grey);
  margin: 0 0 12px;
}
.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(86px, 1fr));
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-map__cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 8px;
  border: 1px solid var(--about-hair);
  border-radius: 10px;
  background: rgba(23, 58, 82, 0.48);
  text-align: center;
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease),
    transform 0.24s var(--ease);
}
.page-about .about-map__name {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--paper);
}
.page-about .about-map__tag {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--cyan-mist);
}
.page-about .about-map__cell:hover,
.page-about .about-map__cell:focus-visible {
  transform: translateY(-3px);
  border-color: var(--gold);
  background: rgba(243, 182, 75, 0.14);
  outline: none;
}
.page-about .about-map__cell:hover .about-map__name,
.page-about .about-map__cell:focus-visible .about-map__name {
  color: var(--gold-bright);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 10px;
}
.page-about .about-team__card {
  padding: 16px 18px;
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--cyan);
  border-radius: 12px;
  background: rgba(12, 34, 54, 0.72);
}
.page-about .about-team__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
  margin: 0 0 8px;
}
.page-about .about-team__card p:last-child {
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--paper-grey);
  margin: 0;
}
.page-about .about-team__body {
  display: grid;
  gap: 18px;
}
.page-about .about-layer {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-layer__item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 10px 0 10px 0;
  border-bottom: 1px dashed var(--about-hair);
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-grey);
}
.page-about .about-layer__item:last-child {
  border-bottom: 0;
}
.page-about .about-layer__item strong {
  color: var(--paper);
}
.page-about .about-layer__idx {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 6px;
}

/* 适用人群 */
.page-about .about-cases {
  display: grid;
  gap: 12px;
}
.page-about .about-case {
  padding: 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--about-radius);
  background: rgba(23, 58, 82, 0.4);
}
.page-about .about-case h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 8px;
}
.page-about .about-case p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-grey);
  margin: 0;
}

/* 备案与联系 */
.page-about .about-records {
  display: grid;
  gap: 12px;
}
.page-about .about-records__card {
  padding: 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(23, 58, 82, 0.5), rgba(12, 34, 54, 0.86));
}
.page-about .about-records__card--ink {
  border-left: 2px solid var(--gold);
}
.page-about .about-records__card p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-grey);
  margin: 0 0 10px;
}
.page-about .about-records__icp {
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--gold);
}

/* 行动按钮 */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}
.page-about .about-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

/* 入场动效 */
@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title,
  .page-about .about-stats,
  .page-about .about-sec__head {
    animation: none;
  }
  .page-about .about-tl__node,
  .page-about .about-map__cell,
  .page-about .about-link,
  .page-about .about-index__list a {
    transition: none;
  }
  .page-about .about-tl__node:hover,
  .page-about .about-tl__node:focus-visible,
  .page-about .about-map__cell:hover,
  .page-about .about-map__cell:focus-visible {
    transform: none;
  }
}

/* 中等屏幕 */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-lines .about-card:first-child {
    grid-column: 1 / -1;
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-case--wide {
    grid-column: 1 / -1;
  }
  .page-about .about-records {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-records__card:first-child {
    grid-column: 1 / -1;
  }
}

/* 桌面：非对称编辑部版式 */
@media (min-width: 980px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 0.78fr);
    align-items: end;
    column-gap: clamp(26px, 3.6vw, 56px);
  }
  .page-about .about-stats {
    grid-column: 1 / -1;
  }
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
    column-gap: clamp(28px, 3.4vw, 52px);
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--adapt-h) + 20px);
  }
  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 2px;
  }
  .page-about .about-index__list a {
    display: flex;
    width: 100%;
    border: 0;
    border-radius: 0;
    padding: 9px 0 9px 12px;
    border-left: 1px solid var(--about-hair);
    background: none;
    font-size: 13.5px;
    color: var(--paper-grey);
  }
  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--cyan);
    background: none;
    color: var(--paper);
  }
  .page-about .about-index__meta {
    display: block;
  }
  .page-about .about-lines {
    grid-template-columns: 1.16fr 0.94fr 1fr;
  }
  .page-about .about-lines .about-card:first-child {
    grid-column: auto;
  }
  .page-about .about-card:first-child {
    margin-top: -6px;
  }
  .page-about .about-card:nth-child(2) {
    margin-top: 10px;
  }
  .page-about .about-team__body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    column-gap: clamp(20px, 2.6vw, 36px);
  }
  .page-about .about-figure--team {
    margin-top: 4px;
  }
  .page-about .about-cases {
    grid-template-columns: 1.15fr 0.92fr 0.93fr;
    align-items: start;
  }
  .page-about .about-case--wide {
    grid-column: auto;
  }
  .page-about .about-case:nth-child(2) {
    margin-top: 14px;
  }
  .page-about .about-records {
    grid-template-columns: 1fr 1fr 0.95fr;
  }
  .page-about .about-records__card:first-child {
    grid-column: auto;
  }
  .page-about .about-scroll-hint {
    display: none;
  }
}
<<<END>>>