.page-about {
  --about-rule: rgba(201, 207, 203, .24);
  display: block;
  background: var(--c-ink);
  color: var(--c-cream);
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  position: relative;
  padding: 26px 0 38px;
  overflow: hidden;
  border-bottom: 1px solid var(--about-rule);
  background:
    radial-gradient(120% 90% at 80% 0%, rgba(53, 242, 208, .14), transparent 62%),
    linear-gradient(180deg, var(--c-night) 0%, var(--c-ink) 100%);
}
.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, var(--hair) 0 1px, transparent 1px 72px);
}
.page-about .breadcrumb {
  position: relative;
  margin-bottom: 26px;
}

.page-about__hero-grid {
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about__kicker {
  display: inline-block;
  margin-bottom: 14px;
  padding-left: 10px;
  border-left: 3px solid var(--c-orange);
  font-family: var(--f-data);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--c-amber);
}

.page-about__h1 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(38px, 9.5vw, 82px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--c-cream);
}
.page-about__h1-sub {
  display: block;
  margin-top: 12px;
  font-size: clamp(17px, 4.3vw, 26px);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.3;
  color: var(--c-cyan);
}

.page-about__lede {
  max-width: 34em;
  margin: 20px 0 0;
  font-family: var(--f-body);
  font-size: clamp(15px, 3.9vw, 18px);
  line-height: 1.78;
  color: var(--c-moss);
}

.page-about__hero-figure {
  position: relative;
  margin: 0;
  border: 3px solid var(--c-cyan);
  background: var(--c-night);
  box-shadow: var(--shadow-hard);
}
.page-about__hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.page-about__hero-figure::after {
  content: "";
  position: absolute;
  right: -3px;
  bottom: -3px;
  width: 32px;
  height: 32px;
  background: var(--c-orange);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

/* ---------- 目录条 ---------- */
.page-about__toc {
  position: relative;
  display: flex;
  gap: 8px;
  margin-top: 32px;
  padding-bottom: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-about__toc-link {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--about-rule);
  font-family: var(--f-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-moss);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.page-about__toc-link:hover,
.page-about__toc-link:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  outline: none;
}

/* ---------- 正文与右侧信息面板 ---------- */
.page-about__body {
  display: grid;
  gap: 42px;
  padding: 50px 0 8px;
}

.page-about__flow {
  display: grid;
  gap: 54px;
  min-width: 0;
}

.page-about__block {
  scroll-margin-top: 24px;
  min-width: 0;
}

.page-about__index {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 9px;
  background: var(--c-amber);
  font-family: var(--f-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--c-ink);
}

.page-about__title {
  margin: 0 0 18px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(23px, 5.6vw, 33px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--c-cream);
}

.page-about__text {
  max-width: 38em;
  margin: 0 0 16px;
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-silver);
}
.page-about__text:last-child {
  margin-bottom: 0;
}

/* ---------- 分组条形图 ---------- */
.page-about__bars {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}
.page-about__bar {
  padding: 10px 0 10px 12px;
  border-left: 3px solid transparent;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}
.page-about__bar:hover,
.page-about__bar:focus-within {
  border-left-color: var(--c-orange);
  background: rgba(53, 242, 208, .05);
}
.page-about__bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 7px;
}
.page-about__bar-name {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 15px;
  color: var(--c-cream);
}
.page-about__bar-count {
  font-family: var(--f-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--c-cyan);
}
.page-about__bar-track {
  height: 12px;
  border: 1px solid var(--about-rule);
  background: rgba(201, 207, 203, .08);
}
.page-about__bar-fill {
  display: block;
  height: 100%;
  background: var(--c-cyan);
}
.page-about__bar:nth-child(1) .page-about__bar-fill { width: 46.7%; }
.page-about__bar:nth-child(2) .page-about__bar-fill { width: 33.3%; }
.page-about__bar:nth-child(3) .page-about__bar-fill { width: 20%; }
.page-about__bar-fill--moss { background: var(--c-moss); }
.page-about__bar-fill--amber { background: var(--c-amber); }
.page-about__bar-desc {
  margin: 8px 0 0;
  font-family: var(--f-body);
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--c-moss);
}

/* ---------- 信息面板 ---------- */
.page-about__rail {
  min-width: 0;
}
.page-about__plate {
  padding: 24px 20px;
  border: 3px solid var(--c-silver);
  background: linear-gradient(160deg, rgba(59, 35, 80, .55), rgba(14, 59, 46, .68));
  box-shadow: var(--shadow-hard);
}
.page-about__plate-title {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: .02em;
  color: var(--c-cream);
}
.page-about__plate-note {
  margin: 0 0 16px;
  font-family: var(--f-body);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-moss);
}
.page-about__plate-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}
.page-about__plate-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-rule);
  font-family: var(--f-body);
  font-size: 14px;
  color: var(--c-moss);
}
.page-about__plate-value {
  font-family: var(--f-data);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 16px;
  color: var(--c-cyan);
  white-space: nowrap;
}
.page-about__plate-link {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--c-orange);
  font-family: var(--f-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-amber);
  text-decoration: none;
}
.page-about__plate-link:hover,
.page-about__plate-link:focus-visible {
  color: var(--c-cyan);
  outline: none;
}

/* ---------- 更新时段 ---------- */
.page-about__rhythm {
  padding: 52px 0 58px;
  background: var(--c-cream);
  color: var(--c-brown);
  border-top: 4px solid var(--c-amber);
  border-bottom: 4px solid var(--c-brown);
}
.page-about__rhythm .page-about__title {
  color: var(--c-brown);
}
.page-about__rhythm .page-about__text {
  color: rgba(34, 26, 20, .76);
}
.page-about__rhythm-grid {
  display: grid;
  margin-top: 28px;
  border-top: 2px solid rgba(34, 26, 20, .18);
}
.page-about__slot {
  padding: 22px 0;
  border-bottom: 2px solid rgba(34, 26, 20, .18);
}
.page-about__slot-time {
  display: block;
  font-family: var(--f-data);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(26px, 6vw, 36px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-brown);
}
.page-about__slot-mark {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 8px;
  background: var(--c-amber);
  font-family: var(--f-data);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-ink);
}
.page-about__slot-text {
  margin: 12px 0 0;
  font-family: var(--f-body);
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(34, 26, 20, .78);
}

/* ---------- 版本时间轴 ---------- */
.page-about__versions {
  position: relative;
  overflow: hidden;
  padding: 54px 0 58px;
  border-bottom: 1px solid var(--about-rule);
  background: linear-gradient(180deg, #0B2C23 0%, var(--c-ink) 100%);
}
.page-about__versions-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .22;
  z-index: 0;
  pointer-events: none;
}
.page-about__versions > .wrap {
  position: relative;
  z-index: 1;
}

.page-about__track {
  display: flex;
  margin: 34px 0 0;
  padding: 0 0 16px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-about__node {
  position: relative;
  flex: 0 0 232px;
  padding: 40px 22px 0 0;
  scroll-snap-align: start;
  box-sizing: border-box;
}
.page-about__node::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(53, 242, 208, .3);
}
.page-about__node:last-child::before {
  background: linear-gradient(90deg, rgba(53, 242, 208, .3), rgba(53, 242, 208, 0));
}
.page-about__dot {
  position: absolute;
  left: 0;
  display: block;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 208, .16);
}
.page-about__node:nth-child(1) .page-about__dot { width: 12px; height: 12px; top: 9px; }
.page-about__node:nth-child(2) .page-about__dot { width: 15px; height: 15px; top: 7px; }
.page-about__node:nth-child(3) .page-about__dot { width: 18px; height: 18px; top: 6px; }
.page-about__node:nth-child(4) .page-about__dot { width: 21px; height: 21px; top: 5px; }
.page-about__node:nth-child(5) .page-about__dot { width: 24px; height: 24px; top: 3px; }
.page-about__node:nth-child(6) .page-about__dot { width: 28px; height: 28px; top: 1px; }

.page-about__node-summary {
  display: block;
  cursor: pointer;
  list-style: none;
}
.page-about__node-summary::-webkit-details-marker {
  display: none;
}
.page-about__node-era {
  display: block;
  margin-bottom: 6px;
  font-family: var(--f-data);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-amber);
}
.page-about__node-head {
  display: block;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--c-cream);
  transition: color .18s var(--ease);
}
.page-about__node[open] .page-about__node-head {
  color: var(--c-cyan);
}
.page-about__node-body {
  margin: 10px 0 0;
  font-family: var(--f-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-moss);
}

/* ---------- 分区版图 ---------- */
.page-about__zones {
  padding: 54px 0 58px;
  background: var(--c-ink);
}
.page-about__zones-grid {
  display: grid;
  gap: 32px;
}
.page-about__zones-figure {
  margin: 0;
  border: 3px solid var(--c-silver);
  background: var(--c-night);
  box-shadow: var(--shadow-hard);
}
.page-about__zones-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.page-about__zone-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about__zone-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 12px 11px 0;
  border-bottom: 1px solid var(--about-rule);
  font-family: var(--f-body);
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--c-silver);
}
.page-about__zone-num {
  flex: 0 0 auto;
  font-family: var(--f-data);
  font-size: 11px;
  color: var(--c-amber);
}

/* ---------- 合作与开放 ---------- */
.page-about__open {
  padding: 52px 0 62px;
  border-top: 1px solid var(--about-rule);
  background: linear-gradient(180deg, var(--c-ink), #06211A);
}
.page-about__open-grid {
  display: grid;
  gap: 30px;
}
.page-about__open-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}
.page-about__open-note {
  padding: 22px 20px;
  border: 3px solid var(--c-cyan);
  background: rgba(59, 35, 80, .42);
  box-shadow: var(--shadow-hard);
}
.page-about__open-mark {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 9px;
  background: var(--c-purple);
  font-family: var(--f-data);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-cream);
}
.page-about__open-list {
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
}
.page-about__open-list li {
  position: relative;
  padding: 9px 0;
  border-bottom: 1px solid var(--about-rule);
  font-family: var(--f-body);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-silver);
}
.page-about__open-list li::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 18px;
  width: 7px;
  height: 7px;
  background: var(--c-orange);
}
.page-about__open-foot {
  margin: 16px 0 0;
  font-family: var(--f-body);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-moss);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about__zone-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about__rhythm-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about__slot {
    padding: 24px 24px 24px 0;
    border-bottom: 0;
    border-right: 2px solid rgba(34, 26, 20, .18);
  }
  .page-about__slot + .page-about__slot {
    padding-left: 24px;
  }
  .page-about__slot:last-child {
    border-right: 0;
  }
  .page-about__node {
    flex: 0 0 252px;
  }
}

@media (min-width: 860px) {
  .page-about__zones-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
    gap: 52px;
    align-items: start;
  }
  .page-about__open-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about__hero {
    padding: 32px 0 44px;
  }
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about__body {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 60px;
    padding: 70px 0 16px;
  }
  .page-about__rail {
    position: sticky;
    top: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}
</style>