.page-about {
  --about-max: 1120px;
  --about-gutter: 20px;
  display: block;
  width: 100%;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 24px var(--about-gutter) 72px;
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

@media (min-width: 768px) {
  .page-about {
    --about-gutter: 40px;
    padding: 40px var(--about-gutter) 96px;
  }
}

@media (min-width: 1100px) {
  .page-about {
    padding: 56px var(--about-gutter) 120px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  font-size: var(--step-2);
  color: var(--muted);
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--steel);
}

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

.page-about .breadcrumbs a:hover {
  color: var(--whistle);
  border-bottom-color: var(--whistle);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 4px 0 36px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -60px -30% auto -30%;
  height: 420px;
  background:
    radial-gradient(58% 100% at 18% 0%, rgba(232, 255, 58, .10), transparent 70%),
    radial-gradient(48% 88% at 82% 12%, rgba(55, 224, 200, .09), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--whistle);
  margin: 0 0 18px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 8.4vw, 90px);
  font-weight: 800;
  line-height: .96;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 22px;
  max-width: 13ch;
}

.page-about .about-hero .lede {
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.76;
  color: var(--muted);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 40px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: 20px 22px 22px;
  background: var(--ink-2);
}

.page-about .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

.page-about .stat__unit {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  color: var(--mist);
}

.page-about .stat__label {
  flex: 0 0 100%;
  margin: 8px 0 0;
  font-size: var(--step-2);
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  margin: 20px 0 0;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-toc .toc {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (min-width: 680px) {
  .page-about .about-toc .toc {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }
}

@media (min-width: 1020px) {
  .page-about .about-toc .toc {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .toc__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 4px 11px 0;
  font-size: var(--step-2);
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .toc__link:hover {
  color: var(--white);
  border-bottom-color: var(--line-strong);
  transform: translateX(3px);
}

.page-about .toc__link[aria-current="true"] {
  color: var(--whistle);
  border-bottom-color: var(--whistle);
}

.page-about .about-toc__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .toc__link:hover .about-toc__num,
.page-about .toc__link[aria-current="true"] .about-toc__num {
  color: var(--amber);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 46px 0 6px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 46px;
    padding-top: 88px;
  }
}

.page-about .about-chapter__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.6vw, 62px);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.03em;
  color: var(--ink-2);
  -webkit-text-stroke: 1px rgba(169, 178, 204, .34);
}

@media (min-width: 900px) {
  .page-about .about-chapter__num {
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

.page-about .about-chapter__body h2 {
  font-family: var(--font-display);
  font-size: clamp(25px, 4.2vw, 42px);
  font-weight: 700;
  line-height: 1.14;
  color: var(--white);
  margin: 0 0 22px;
  max-width: 20ch;
}

.page-about .about-chapter__body p {
  font-size: var(--step-3);
  line-height: 1.78;
  color: var(--muted);
  margin: 0 0 18px;
  max-width: 64ch;
}

.page-about .about-quote {
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 34px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--white);
  margin: 0 0 26px;
  padding-left: 20px;
  border-left: 2px solid var(--whistle);
  max-width: 24ch;
}

.page-about .about-more {
  margin-top: 26px;
}

/* ---------- 图文交错 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin: 10px 0 0;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.14fr);
    gap: 58px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.14fr) minmax(0, 1fr);
  }

  .page-about .about-split--reverse .about-shot {
    order: -1;
  }
}

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

.page-about .about-shot__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color .3s var(--ease);
}

.page-about .about-shot__frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(169, 178, 204, .13);
  pointer-events: none;
}

.page-about .about-shot__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform .6s var(--ease);
}

.page-about .about-shot:hover .about-shot__frame {
  border-color: var(--line-strong);
}

.page-about .about-shot:hover .about-shot__frame img {
  transform: scale(1.02);
}

.page-about .about-shot__cap {
  margin: 12px 0 0;
  font-size: var(--step-2);
  line-height: 1.62;
  color: var(--muted);
  max-width: 44ch;
  opacity: .74;
  transition: opacity .3s var(--ease);
}

.page-about .about-shot:hover .about-shot__cap {
  opacity: 1;
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__n {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: var(--step-5);
  font-weight: 700;
  line-height: 1;
  color: var(--whistle);
  font-variant-numeric: tabular-nums;
}

.page-about .about-roles__t {
  font-size: var(--step-3);
  font-weight: 600;
  color: var(--white);
  line-height: 1.3;
}

.page-about .about-roles__d {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.65;
  color: var(--muted);
  max-width: 46ch;
}

/* ---------- 四个环节 ---------- */
.page-about .about-flow {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 10px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-flow__step {
  position: relative;
  padding: 24px 20px 28px;
  background: var(--ink-2);
  transition: background .25s var(--ease);
}

.page-about .about-flow__step:hover {
  background: #1a2657;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  width: 18px;
  height: 2px;
  background: var(--whistle);
}

.page-about .about-flow__k {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .22em;
  color: var(--whistle);
}

.page-about .about-flow h3 {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .about-flow__step p:last-child {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-flow__note {
  margin-top: 22px;
  padding-left: 16px;
  border-left: 1px solid var(--line-strong);
  font-size: var(--step-2) !important;
  color: var(--mist) !important;
  max-width: 54ch;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin: 12px 0 0;
}

@media (min-width: 760px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
    gap: 48px;
  }
}

.page-about .about-coverage__col h3 {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-tags .badge {
  font-size: var(--step-2);
  padding: 5px 12px;
  letter-spacing: .02em;
}

.page-about .about-facts {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-facts li {
  background: var(--ink-2);
  padding: 22px 20px 24px;
}

.page-about .about-facts__v {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-facts__l {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 4px 0 0;
  padding: 0 0 0 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-timeline__node {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line-strong);
  transition: background .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__node,
.page-about .about-timeline__item:focus-within .about-timeline__node {
  background: var(--whistle);
  border-color: var(--whistle);
  box-shadow: 0 0 0 5px rgba(232, 255, 58, .12);
}

.page-about .about-timeline__ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .2em;
  color: var(--mist);
  transition: color .25s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__ver {
  color: var(--whistle);
}

.page-about .about-timeline h3 {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.72;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  margin-top: 72px;
  padding: 36px 24px 28px;
  border: 1px solid var(--line);
  background:
    radial-gradient(70% 120% at 8% 0%, rgba(232, 255, 58, .08), transparent 68%),
    var(--ink-2);
}

@media (min-width: 768px) {
  .page-about .about-outro {
    margin-top: 104px;
    padding: 52px 46px 34px;
  }
}

.page-about .about-outro__lead {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1.26;
  color: var(--white);
  margin: 0 0 26px;
  max-width: 22ch;
}

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

.page-about .about-outro__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-outro__meta {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.6;
  color: var(--muted);
  max-width: 52ch;
}

.page-about .about-outro__meta a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-outro__meta a:hover {
  color: var(--whistle);
  border-bottom-color: var(--whistle);
}

.page-about .about-top {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--line);
  transition: color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-top:hover {
  color: var(--whistle);
  border-color: var(--whistle);
  transform: translateY(-2px);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-shot__frame img,
  .page-about .about-shot__frame,
  .page-about .about-shot__cap,
  .page-about .toc__link,
  .page-about .about-timeline__node,
  .page-about .about-timeline__ver,
  .page-about .about-top,
  .page-about .about-flow__step {
    transition: none !important;
  }

  .page-about .about-shot:hover .about-shot__frame img,
  .page-about .about-shot:hover .about-shot__frame,
  .page-about .toc__link:hover,
  .page-about .about-top:hover {
    transform: none !important;
  }
}