/* ===== 品牌档案 · 页面专属样式 ===== */
.page-about {
  --about-ink: var(--jh-cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(104px, 16vw, 186px) 0 clamp(46px, 6vw, 78px);
}

.page-about .about-hero__shard {
  position: absolute;
  inset: -12% -8% 0 -8%;
  z-index: -1;
  background:
    radial-gradient(72% 56% at 88% 4%, rgba(123, 92, 255, .34), transparent 64%),
    radial-gradient(58% 48% at 4% 96%, rgba(79, 107, 74, .42), transparent 70%),
    linear-gradient(115deg, transparent 41%, rgba(184, 255, 60, .085) 41.4%, rgba(184, 255, 60, .085) 52%, transparent 52.4%);
}

.page-about .about-hero__shard::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(58deg, rgba(242, 237, 227, .05) 0 1px, transparent 1px 46px);
  -webkit-mask-image: linear-gradient(180deg, #000 0 60%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0 60%, transparent 100%);
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 24ch;
  font-size: clamp(1.95rem, 6.2vw, 4.2rem);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 22px 0 0;
  color: var(--jh-mist);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 44px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-hero__facts strong {
  font-family: var(--jh-font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--jh-green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__facts span {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--jh-mist);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-top: clamp(18px, 3.4vw, 42px);
  padding-bottom: clamp(64px, 9vw, 124px);
}

.page-about .about-rail {
  align-self: start;
  padding-bottom: 22px;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  color: var(--jh-mist);
}

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

.page-about .about-rail .jh-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 12px;
  border-radius: var(--jh-radius-sm);
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--jh-mist);
  text-decoration: none;
  transition: color .18s var(--jh-ease), background-color .18s var(--jh-ease), border-color .18s var(--jh-ease);
}

.page-about .about-rail .jh-index__link:hover {
  color: var(--jh-cream);
  background: var(--jh-graphite);
}

.page-about .about-rail .jh-index__link.is-active {
  color: var(--jh-green);
  border-left-color: var(--jh-green);
  background: var(--jh-graphite);
}

.page-about .about-rail .jh-index__num {
  font-family: var(--jh-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--jh-clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail .jh-index__link.is-active .jh-index__num {
  color: var(--jh-green);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(52px, 7.6vw, 100px);
  min-width: 0;
}

/* ---------- 章节标题 ---------- */
.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--jh-rock);
}

.page-about .about-sec__no {
  flex: none;
  font-family: var(--jh-font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--jh-green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.32rem, 3.3vw, 2.05rem);
  line-height: 1.24;
}

.page-about .about-sec__lead {
  max-width: 60ch;
  margin: 0 0 26px;
  color: var(--jh-mist);
}

.page-about .about-note {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--jh-mist);
}

.page-about .about-note a {
  color: var(--jh-cream);
  text-decoration: underline;
  text-decoration-color: var(--jh-green);
  text-underline-offset: 3px;
}

/* ---------- 01 团队分工 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--jh-rock);
  border: 1px solid var(--jh-rock);
  border-radius: var(--jh-radius);
  overflow: hidden;
}

.page-about .about-crew__item {
  padding: 22px 20px 26px;
  background: var(--jh-graphite);
  border-top: 2px solid transparent;
}

.page-about .about-crew__item:nth-child(1) { border-top-color: var(--jh-green); }
.page-about .about-crew__item:nth-child(2) { border-top-color: var(--jh-violet); }
.page-about .about-crew__item:nth-child(3) { border-top-color: var(--jh-clay); }
.page-about .about-crew__item:nth-child(4) { border-top-color: var(--jh-orange); }

.page-about .about-crew__num {
  display: block;
  font-family: var(--jh-font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--jh-cream);
}

.page-about .about-crew__item:nth-child(1) .about-crew__num { color: var(--jh-green); }
.page-about .about-crew__item:nth-child(2) .about-crew__num { color: var(--jh-violet); }
.page-about .about-crew__item:nth-child(3) .about-crew__num { color: var(--jh-clay); }
.page-about .about-crew__item:nth-child(4) .about-crew__num { color: var(--jh-orange); }

.page-about .about-crew__role {
  margin: 8px 0 9px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--jh-cream);
}

.page-about .about-crew__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--jh-mist);
}

/* ---------- 02 三道流程 ---------- */
.page-about .about-proof {
  display: grid;
  gap: 30px;
}

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

.page-about .about-proof__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 0 0 26px 42px;
}

.page-about .about-steps__item:last-child {
  padding-bottom: 0;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 24px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--jh-rock), rgba(42, 49, 56, .18));
}

.page-about .about-steps__item:last-child::before {
  display: none;
}

.page-about .about-steps__dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 23px;
  height: 23px;
  border-radius: 50%;
  border: 1px solid var(--jh-green);
  background: var(--jh-black);
  display: grid;
  place-items: center;
}

.page-about .about-steps__dot::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jh-green);
}

.page-about .about-steps__title {
  margin: 0 0 7px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--jh-cream);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--jh-mist);
}

/* ---------- 03 主题簇 ---------- */
.page-about .about-clusters__frame {
  margin: 0 0 26px;
}

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

.page-about .about-clusters {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cluster {
  padding: 18px 20px 20px;
  background: var(--jh-graphite);
  border-left: 3px solid var(--jh-moss);
  border-radius: 0 var(--jh-radius-sm) var(--jh-radius-sm) 0;
}

.page-about .about-cluster:nth-child(1) { border-left-color: var(--jh-green); }
.page-about .about-cluster:nth-child(2) { border-left-color: var(--jh-violet); }
.page-about .about-cluster:nth-child(3) { border-left-color: var(--jh-clay); }
.page-about .about-cluster:nth-child(4) { border-left-color: var(--jh-orange); }
.page-about .about-cluster:nth-child(5) { border-left-color: var(--jh-moss); }

.page-about .about-cluster__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--jh-cream);
}

.page-about .about-cluster p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--jh-mist);
}

/* ---------- 04 版本时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 78%);
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-node {
  position: relative;
  min-width: 0;
  padding: 34px 18px 22px;
  background: var(--jh-graphite);
  border: 1px solid var(--jh-rock);
  border-radius: var(--jh-radius-sm);
  scroll-snap-align: start;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: var(--jh-radius-sm) var(--jh-radius-sm) 0 0;
  background: linear-gradient(90deg, var(--jh-green), rgba(184, 255, 60, 0));
}

.page-about .about-node__year {
  display: block;
  font-family: var(--jh-font-mono);
  font-size: clamp(28px, 3.6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--jh-cream);
}

.page-about .about-node__title {
  margin: 12px 0 9px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--jh-green);
}

.page-about .about-node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--jh-mist);
}

/* ---------- 过渡带 ---------- */
.page-about .about-skyline {
  position: relative;
  margin: 0;
  border-radius: var(--jh-radius);
  overflow: hidden;
}

.page-about .about-skyline img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-skyline__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 40px 20px 16px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--jh-cream);
  background: linear-gradient(0deg, rgba(7, 9, 12, .92) 0%, rgba(7, 9, 12, 0) 100%);
}

/* ---------- 05 更新节奏 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 22px;
  margin-bottom: 28px;
}

.page-about .about-metric {
  padding-top: 14px;
  border-top: 2px solid var(--jh-rock);
}

.page-about .about-metric:nth-child(1) { border-top-color: var(--jh-green); }
.page-about .about-metric:nth-child(3) { border-top-color: var(--jh-orange); }

.page-about .about-metric__num {
  display: block;
  font-family: var(--jh-font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--jh-cream);
}

.page-about .about-metric__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--jh-mist);
}

/* ---------- 06 纠错通道 ---------- */
.page-about .about-fix {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 46px);
  border-radius: var(--jh-radius);
  background: linear-gradient(152deg, var(--jh-moss) 0%, #2E3B2B 60%, var(--jh-graphite) 100%);
}

.page-about .about-fix::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(122deg, rgba(242, 237, 227, .07) 0 1px, transparent 1px 38px);
}

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

.page-about .about-fix p {
  max-width: 58ch;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--jh-cream);
}

.page-about .about-fix__list {
  display: grid;
  gap: 13px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.page-about .about-fix__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--jh-cream);
}

.page-about .about-fix__k {
  flex: none;
  padding: 2px 10px;
  border: 1px solid rgba(184, 255, 60, .42);
  border-radius: 999px;
  font-family: var(--jh-font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--jh-green);
}

.page-about .about-fix__list a {
  color: var(--jh-cream);
  text-decoration: underline;
  text-decoration-color: var(--jh-green);
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-clusters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-metrics {
    gap: 28px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-proof {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 42px;
    align-items: start;
  }
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--jh-header-h) + 28px);
  }
  .page-about .about-rail .jh-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
  .page-about .about-rail .jh-index__link {
    font-size: 15px;
  }
  .page-about .about-timeline {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    overflow-x: visible;
    padding-bottom: 0;
  }
}

@media (min-width: 1180px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail .jh-index__link {
    transition: none;
  }
}