.page-about {
  background: var(--rice-white);
  color: var(--ink-900);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 24px;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--stone-500);
  opacity: .5;
}

.page-about .crumb {
  color: var(--stone-500);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .crumb:hover,
.page-about .crumb:focus-visible {
  color: var(--turf-600);
}

.page-about .crumb[aria-current="page"] {
  color: var(--ink-900);
  font-weight: 600;
}

/* ---------- 章节跳转胶囊 ---------- */
.page-about .about-jump {
  display: none;
}

/* ---------- 通用章节文本 ---------- */
.page-about .section__head {
  max-width: 62ch;
  margin-bottom: 44px;
}

.page-about .section__title {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.page-about .section__lede {
  margin: 0;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--stone-500);
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .3em;
  color: var(--turf-600);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 36px 0 72px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 4%;
  left: -34%;
  width: 124%;
  height: 62%;
  background: linear-gradient(118deg, var(--sea-800), var(--turf-900) 58%, rgba(16, 58, 87, 0) 100%);
  clip-path: polygon(0 20%, 100% 0, 100% 76%, 0 100%);
  opacity: .075;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-size: clamp(2rem, 8vw, 4.1rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0 0 30px;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-900);
  opacity: .78;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__aside {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 20px;
  padding: 28px 24px;
  border-radius: var(--r-lg);
  background: var(--turf-900);
  color: var(--rice-white);
}

.page-about .about-hero__aside::after {
  content: "档案";
  position: absolute;
  right: 14px;
  bottom: -14px;
  font-size: 4.2rem;
  font-weight: 900;
  letter-spacing: .08em;
  color: rgba(245, 242, 233, .06);
  pointer-events: none;
}

.page-about .about-hero__aside-title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .28em;
  color: var(--referee-yellow);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 18px;
}

.page-about .about-hero__stats .stat {
  display: grid;
  gap: 5px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(245, 242, 233, .14);
}

.page-about .about-hero__stats .stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.05;
  color: var(--referee-yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stats .stat__label {
  font-size: .86rem;
  line-height: 1.65;
  color: rgba(245, 242, 233, .74);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-timeline__figure {
  margin: 0;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .about-timeline__list {
  position: relative;
  display: grid;
  gap: 24px;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 30px;
  width: 7px;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--turf-600) 0%, var(--turf-400) 58%, rgba(72, 161, 119, .12) 100%);
  clip-path: polygon(0 0, 100% 0, 64% 100%, 36% 100%);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 30px;
  width: 15px;
  height: 15px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--rice-white);
  border: 3px solid var(--turf-600);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--referee-yellow);
  background: var(--turf-900);
  transform: scale(1.12);
}

.page-about .about-node {
  padding: 22px 24px 20px;
  border: 1px solid var(--mist-200);
  border-radius: var(--r-md);
  background: #fff;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  transform: translateY(-4px);
  border-color: rgba(46, 125, 87, .3);
  box-shadow: var(--shadow-2);
}

.page-about .about-node__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--terracotta);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-node__text {
  margin: 0 0 16px;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--stone-500);
}

.page-about .about-node__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--mist-200);
}

.page-about .about-node__metric {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: .84rem;
  color: var(--ink-900);
}

.page-about .about-node__metric .num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--turf-600);
  font-variant-numeric: tabular-nums;
}

/* ---------- 四类内容 ---------- */
.page-about .about-lines-section {
  background: var(--mist-200);
}

.page-about .about-lines {
  display: grid;
  gap: 18px;
}

.page-about .about-line {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 24px 24px 22px;
  border-radius: var(--r-md);
  border-left: 5px solid var(--turf-600);
  background: #fff;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-line:nth-child(2) {
  border-left-color: var(--sea-500);
}

.page-about .about-line:nth-child(3) {
  border-left-color: var(--terracotta);
}

.page-about .about-line:nth-child(4) {
  border-left-color: var(--turf-900);
}

.page-about .about-line:hover,
.page-about .about-line:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .about-line__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--stone-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-line__title {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-line__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.82;
  color: var(--stone-500);
}

/* ---------- 青训 ---------- */
.page-about .about-youth__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-youth__figure {
  margin: 0;
}

.page-about .about-youth__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-youth__content {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .about-age-nav {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 2px 2px 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-age-nav .chip {
  flex: none;
  font-family: var(--font-mono);
  font-size: .86rem;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-age-nav .chip:hover,
.page-about .about-age-nav .chip:focus-visible {
  border-color: var(--turf-600);
  color: var(--turf-600);
}

.page-about .about-age-list {
  display: grid;
  gap: 14px;
}

.page-about .about-age {
  padding: 20px 22px;
  border: 1px solid var(--mist-200);
  border-radius: var(--r-sm);
  background: #fff;
  scroll-margin-top: 96px;
  transition: border-color .26s var(--ease), box-shadow .26s var(--ease), transform .26s var(--ease);
}

.page-about .about-age:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-1);
}

.page-about .about-age:target {
  border-color: var(--turf-600);
  box-shadow: var(--shadow-1);
}

.page-about .about-age__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .about-age__code {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1;
  color: var(--turf-600);
  font-variant-numeric: tabular-nums;
}

.page-about .about-age__title {
  margin: 0;
  font-size: .96rem;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-age__text {
  margin: 0 0 10px;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--stone-500);
}

.page-about .about-age__facts {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--mist-200);
  font-size: .82rem;
  color: var(--stone-500);
}

.page-about .about-age__facts .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

/* ---------- 编辑部 ---------- */
.page-about .about-editorial {
  padding: 40px 24px;
  border-radius: var(--r-lg);
  background: var(--sea-800);
  color: var(--rice-white);
}

.page-about .about-editorial .eyebrow {
  color: var(--referee-yellow);
}

.page-about .about-editorial__title {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 4.2vw, 2.25rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.page-about .about-editorial__lede {
  margin: 0;
  max-width: 60ch;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(245, 242, 233, .78);
}

.page-about .about-editorial__grid {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-editorial__card {
  display: grid;
  gap: 8px;
  padding: 20px 22px;
  border: 1px solid rgba(245, 242, 233, .14);
  border-radius: var(--r-sm);
  background: rgba(245, 242, 233, .06);
  transition: background .26s var(--ease), transform .26s var(--ease);
}

.page-about .about-editorial__card:hover {
  transform: translateY(-4px);
  background: rgba(245, 242, 233, .12);
}

.page-about .about-editorial__card-no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--referee-yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-editorial__card-title {
  margin: 0;
  font-size: 1.04rem;
  font-weight: 700;
}

.page-about .about-editorial__card-text {
  margin: 0;
  font-size: .89rem;
  line-height: 1.78;
  color: rgba(245, 242, 233, .76);
}

.page-about .about-editorial__foot {
  margin: 26px 0 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(245, 242, 233, .74);
}

.page-about .about-editorial__foot a {
  color: var(--referee-yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-editorial__foot a:hover,
.page-about .about-editorial__foot a:focus-visible {
  color: #fff;
}

/* ---------- 资料来源 ---------- */
.page-about .about-sources {
  display: grid;
  gap: 32px;
}

.page-about .about-sources__text {
  margin: 0 0 14px;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--stone-500);
}

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

.page-about .about-source-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-source {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  padding: 20px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--mist-200);
  background: #fff;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease);
}

.page-about .about-source:hover {
  transform: translateY(-4px);
  border-color: rgba(46, 125, 87, .3);
  box-shadow: var(--shadow-1);
}

.page-about .about-source__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--terracotta);
  font-variant-numeric: tabular-nums;
}

.page-about .about-source__title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-source__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--stone-500);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 18px;
}

.page-about .about-next__card {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 26px 24px 24px;
  border-radius: var(--r-md);
  background: var(--mist-200);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-next__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .about-next__tag {
  justify-self: start;
}

.page-about .about-next__title {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.42;
}

.page-about .about-next__text {
  margin: 0;
  font-size: .91rem;
  line-height: 1.8;
  color: var(--stone-500);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ---------- 城市收束 ---------- */
.page-about .about-city {
  position: relative;
  isolation: isolate;
  margin-top: 24px;
  overflow: hidden;
  background: var(--turf-900);
}

.page-about .about-city__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  opacity: .45;
}

.page-about .about-city__panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: clamp(26px, 7vw, 80px);
  background: linear-gradient(100deg, rgba(23, 64, 47, .94) 0%, rgba(23, 64, 47, .7) 55%, rgba(23, 64, 47, .2) 100%);
  color: var(--rice-white);
}

.page-about .about-city__panel .eyebrow {
  margin: 0;
  color: var(--referee-yellow);
}

.page-about .about-city__panel h2 {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(1.45rem, 5.6vw, 2.4rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.page-about .about-city__panel p {
  margin: 0;
  max-width: 44ch;
  font-size: .92rem;
  line-height: 1.82;
  color: rgba(245, 242, 233, .84);
}

.page-about .about-city__panel .btn {
  align-self: flex-start;
  margin-top: 6px;
}

/* ---------- 进入视口的淡入 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .26s var(--ease), transform .26s var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-node,
  .page-about .about-line,
  .page-about .about-source,
  .page-about .about-next__card,
  .page-about .about-age,
  .page-about .about-editorial__card {
    transition: none;
  }
}

/* ---------- 平板起 ---------- */
@media (min-width: 720px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-editorial {
    padding: 56px 48px;
  }

  .page-about .about-editorial__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 52px 0 92px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 56px;
  }

  .page-about .about-hero__aside {
    padding: 34px 30px;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 4fr 7fr;
    gap: 58px;
    align-items: start;
  }

  .page-about .about-timeline__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-youth__grid {
    grid-template-columns: 5fr 7fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .about-youth__figure {
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-sources {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-city__media img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-city__panel {
    max-width: 46%;
  }

  .page-about .about-city__panel p {
    font-size: .95rem;
  }
}

@media (min-width: 1280px) {
  .page-about .about-jump {
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 4;
  }

  .page-about .about-jump .jump-pill {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    padding: 12px 6px;
    border-radius: var(--r-pill);
    font-size: 12px;
    letter-spacing: .2em;
    text-decoration: none;
    color: var(--stone-500);
    background: rgba(226, 228, 224, .55);
    transition: color .22s var(--ease), background .22s var(--ease);
  }

  .page-about .about-jump .jump-pill:hover,
  .page-about .about-jump .jump-pill:focus-visible {
    color: var(--turf-900);
    background: var(--referee-yellow);
  }

  .page-about .about-city__panel {
    max-width: 42%;
  }
}