.page-about {
  background: var(--xh-ink);
  color: var(--xh-paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(116px, 17vh, 186px) 0 0;
  background:
    radial-gradient(110% 70% at 84% -6%, rgba(200, 169, 106, .12), transparent 62%),
    radial-gradient(80% 60% at 6% 8%, rgba(184, 122, 75, .07), transparent 58%),
    linear-gradient(180deg, #12130F 0%, var(--xh-ink) 72%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
}

.page-about h1 {
  margin: 16px 0 0;
  font-family: var(--xh-font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  line-height: 1.12;
  letter-spacing: .008em;
  color: var(--xh-paper);
}

.page-about .about-lead {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.85;
  color: var(--xh-paper-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* 导读卡 */
.page-about .about-hero__aside {
  border-radius: 2px;
  padding: 24px 22px 20px;
}

.page-about .about-aside__title {
  margin: 0;
  font-family: var(--xh-font-mono);
  font-size: .6875rem;
  letter-spacing: .32em;
  color: var(--xh-gold);
  text-transform: uppercase;
}

.page-about .about-toc {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-toc a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--xh-gold-line);
  color: var(--xh-paper-dim);
  text-decoration: none;
  font-size: .9375rem;
  line-height: 1.5;
  transition: color .18s var(--xh-ease), border-color .18s var(--xh-ease);
}

.page-about .about-toc li:last-child a {
  border-bottom-color: transparent;
}

.page-about .about-toc a span {
  font-family: var(--xh-font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
  color: var(--xh-gold);
  opacity: .8;
}

.page-about .about-toc a:hover,
.page-about .about-toc a[aria-current="true"] {
  color: var(--xh-gold-l);
  border-color: var(--xh-gold);
}

/* 首屏数据条 */
.page-about .about-stats {
  list-style: none;
  margin: clamp(38px, 5.5vw, 68px) 0 0;
  padding: clamp(26px, 3vw, 34px) 0 clamp(46px, 7vw, 84px);
  border-top: 1px solid var(--xh-gold-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 18px;
}

.page-about .about-stats li {
  animation: about-rise .55s var(--xh-ease) both;
}

.page-about .about-stats li:nth-child(2) { animation-delay: .06s; }
.page-about .about-stats li:nth-child(3) { animation-delay: .12s; }
.page-about .about-stats li:nth-child(4) { animation-delay: .18s; }

.page-about .about-stats b {
  display: block;
  font-family: var(--xh-font-mono);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.1vw, 2.2rem);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--xh-gold);
}

.page-about .about-stats span {
  display: block;
  margin-top: 10px;
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--xh-stone);
}

@keyframes about-rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 分区基础 ---------- */
.page-about .section {
  padding: clamp(52px, 7.5vw, 100px) 0;
}

.page-about .about-secno {
  margin: 0 0 14px;
  font-family: var(--xh-font-mono);
  font-size: .75rem;
  letter-spacing: .34em;
  color: var(--xh-gold);
}

.page-about h2 {
  margin: 0;
  font-family: var(--xh-font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.1vw, 2.25rem);
  line-height: 1.28;
  letter-spacing: .008em;
  color: var(--xh-paper);
}

.page-about .about-head {
  max-width: 62ch;
}

.page-about .about-lede {
  margin: 18px 0 0;
  font-size: clamp(.9375rem, 1.15vw, 1.0625rem);
  line-height: 1.85;
  color: var(--xh-stone);
}

.page-about .about-inline-link {
  color: var(--xh-gold-l);
  text-decoration: none;
  border-bottom: 1px solid var(--xh-gold-dim);
  transition: border-color .18s var(--xh-ease), color .18s var(--xh-ease);
}

.page-about .about-inline-link:hover {
  color: var(--xh-gold);
  border-bottom-color: var(--xh-gold);
}

/* ---------- 非对称图文 ---------- */
.page-about .about-split {
  display: grid;
  gap: 32px;
}

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

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--xh-gold-line);
  filter: saturate(.86) contrast(1.03);
  transition: filter .3s var(--xh-ease);
}

.page-about .about-split__media:hover img {
  filter: saturate(1) contrast(1.05);
}

.page-about .about-split__media figcaption {
  margin-top: 14px;
  padding-left: 13px;
  border-left: 1px solid var(--xh-gold-dim);
  font-size: .8125rem;
  line-height: 1.72;
  color: var(--xh-stone);
}

.page-about .about-split__body p {
  margin: 0 0 18px;
  font-size: clamp(.9375rem, 1.1vw, 1.0625rem);
  line-height: 1.88;
  color: var(--xh-paper-dim);
}

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

.page-about .about-split__body strong {
  color: var(--xh-gold-l);
  font-weight: 600;
}

.page-about .about-inline-note {
  margin-top: 20px !important;
  font-size: .875rem !important;
  color: var(--xh-stone) !important;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 32px 28px;
  border-left: 1px solid var(--xh-gold-line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--xh-ink);
  border: 1px solid var(--xh-gold);
  transition: background .2s var(--xh-ease), box-shadow .2s var(--xh-ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--xh-gold);
  box-shadow: 0 0 0 5px var(--xh-gold-dim);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--xh-font-mono);
  font-size: .8125rem;
  letter-spacing: .2em;
  color: var(--xh-gold);
}

.page-about .about-timeline__body h3 {
  margin: 8px 0 10px;
  font-family: var(--xh-font-display);
  font-weight: 600;
  font-size: clamp(1.0625rem, 1.7vw, 1.25rem);
  line-height: 1.45;
  color: var(--xh-paper);
}

.page-about .about-timeline__body h3 .tag {
  margin-left: 8px;
  vertical-align: middle;
  font-family: var(--xh-font-body);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--xh-stone);
}

/* ---------- 六类栏目 ---------- */
.page-about .about-cats {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--xh-gold-line);
  border: 1px solid var(--xh-gold-line);
}

.page-about .about-cat {
  position: relative;
  padding: 26px 24px 28px;
  background: var(--xh-ink-2);
  transition: background .2s var(--xh-ease);
}

.page-about .about-cat::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 0;
  background: var(--xh-gold);
  transition: width .26s var(--xh-ease);
}

.page-about .about-cat:hover {
  background: var(--xh-ink-3);
}

.page-about .about-cat:hover::after {
  width: 100%;
}

.page-about .about-cat__num {
  margin: 0;
  font-family: var(--xh-font-mono);
  font-size: .6875rem;
  letter-spacing: .26em;
  color: var(--xh-gold);
  opacity: .55;
}

.page-about .about-cat__name {
  display: block;
  margin: 12px 0 10px;
  font-family: var(--xh-font-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--xh-paper);
}

.page-about .about-cat__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.82;
  color: var(--xh-stone);
}

.page-about .about-cat__desc .about-inline-link {
  display: inline-block;
  margin-left: 4px;
  font-size: .8125rem;
}

/* ---------- 团队指标 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 26px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--xh-gold-line);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 20px 18px;
}

.page-about .about-metrics b {
  display: block;
  font-family: var(--xh-font-mono);
  font-weight: 600;
  font-size: clamp(1.2rem, 2.1vw, 1.5rem);
  line-height: 1;
  color: var(--xh-copper);
}

.page-about .about-metrics span {
  display: block;
  margin-top: 9px;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--xh-stone);
}

/* ---------- 协作面板 ---------- */
.page-about .about-panel {
  position: relative;
  padding: clamp(28px, 4vw, 48px) clamp(22px, 4vw, 52px);
  background: linear-gradient(150deg, var(--xh-ink-2) 0%, #141510 60%, #101109 100%);
  border: 1px solid var(--xh-gold-line);
  border-left: 2px solid var(--xh-gold);
}

.page-about .about-panel__text {
  margin: 20px 0 0;
  max-width: 68ch;
  font-size: clamp(.9375rem, 1.1vw, 1.0625rem);
  line-height: 1.88;
  color: var(--xh-paper-dim);
}

.page-about .about-facts {
  margin-top: clamp(28px, 3.5vw, 40px);
  padding-top: clamp(24px, 3vw, 32px);
  border-top: 1px solid var(--xh-gold-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
}

.page-about .about-fact b {
  display: block;
  font-family: var(--xh-font-mono);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--xh-gold);
}

.page-about .about-fact span {
  display: block;
  margin-top: 10px;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--xh-stone);
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  padding: clamp(36px, 5vw, 60px) 0 clamp(56px, 8vw, 96px);
}

.page-about .about-cta__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: clamp(28px, 3.5vw, 40px);
  border-top: 1px solid var(--xh-gold-line);
}

.page-about .about-cta__inner p {
  margin: 0;
  max-width: 52ch;
  font-family: var(--xh-font-display);
  font-size: clamp(1.0625rem, 1.8vw, 1.3125rem);
  line-height: 1.6;
  color: var(--xh-paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 0 32px;
    padding-left: 38px;
  }

  .page-about .about-timeline__year {
    padding-top: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(250px, .72fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stats li {
    animation: none;
  }

  .page-about .about-cat::after,
  .page-about .about-toc a,
  .page-about .about-split__media img {
    transition: none;
  }
}