.page-about {
  --about-grid-line: rgba(199, 207, 203, .14);
  --about-panel: rgba(28, 58, 44, .55);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--verdigris);
}
.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--mist);
}

/* 首屏 */
.page-about .about-hero {
  padding-top: 28px;
}
.page-about .about-hero-grid {
  display: grid;
  gap: 36px;
}
.page-about .label-tag {
  display: inline-block;
  writing-mode: horizontal-tb;
}
.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 8vw, 58px);
  line-height: 1.06;
  letter-spacing: -.025em;
  color: var(--mist);
}
.page-about .about-lede {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--silver);
}
.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}
.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .about-fact .stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.01em;
}
.page-about .about-fact .stat-label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--verdigris);
}
.page-about .about-unit {
  margin-left: 3px;
  font-size: 13px;
  color: var(--silver);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.page-about .about-hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .tactics-svg {
  width: min(100%, 340px);
  height: auto;
  transform: rotate(-2deg);
  filter: drop-shadow(0 22px 46px rgba(0, 0, 0, .55));
}

/* 通用章节头 */
.page-about .about-head {
  max-width: 720px;
  margin-bottom: 26px;
}
.page-about .about-head .h-title {
  color: var(--mist);
  letter-spacing: -.015em;
}
.page-about .about-head .h-sub {
  color: var(--silver);
  line-height: 1.7;
}

/* 起点 */
.page-about .about-origin-grid {
  display: grid;
  gap: 26px;
}
.page-about .about-origin-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver);
}
.page-about .about-origin-copy p:last-child {
  margin-bottom: 0;
}
.page-about .about-origin-note {
  position: relative;
  padding: 22px 22px 22px 26px;
  background: var(--cream);
  color: var(--brown);
  transform: rotate(-1.2deg);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .45);
}
.page-about .about-origin-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--orange);
}
.page-about .note-kicker {
  display: block;
  font-size: 11px;
  letter-spacing: .22em;
  color: rgba(26, 20, 16, .62);
}
.page-about .about-origin-note strong {
  display: block;
  margin: 6px 0 8px;
  font-family: var(--font-mono);
  font-size: 44px;
  line-height: 1;
  letter-spacing: -.03em;
}
.page-about .about-origin-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(26, 20, 16, .82);
}

/* 版本时间带 */
.page-about .about-versions-figure {
  margin: 0 0 26px;
}
.page-about .about-versions-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.page-about .version-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}
.page-about .version-chip {
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--silver);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}
.page-about .version-chip:hover,
.page-about .version-chip:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(200, 255, 61, .08);
}
.page-about .version-list {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 26px;
  list-style: none;
}
.page-about .version-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 61, .12));
}
.page-about .version-item {
  position: relative;
  padding: 22px 0;
  scroll-margin-top: 120px;
}
.page-about .version-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 30px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, .14);
}
.page-about .version-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 11vw, 60px);
  line-height: .92;
  letter-spacing: -.04em;
  color: var(--lime);
}
.page-about .version-meta {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--verdigris);
}
.page-about .version-title {
  margin: 8px 0 8px;
  font-size: 19px;
  line-height: 1.35;
  color: var(--mist);
}
.page-about .version-body p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver);
}

/* 数据链路 */
.page-about .about-data-grid {
  display: grid;
  gap: 30px;
}
.page-about .about-data-media {
  margin: 0;
}
.page-about .about-data-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.page-about .about-data-lede {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
}
.page-about .pipeline-steps {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .pipeline-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}
.page-about .step-num {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--orange);
}
.page-about .pipeline-step h3 {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 16px;
  color: var(--mist);
}
.page-about .pipeline-step p {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--silver);
}
.page-about .about-data-foot {
  margin: 24px 0 0;
  padding: 12px 0 12px 16px;
  border-left: 3px solid var(--lime);
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
  background: rgba(200, 255, 61, .05);
}

/* 团队 */
.page-about .about-team-grid {
  display: grid;
  gap: 32px;
}
.page-about .team-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .team-row {
  display: grid;
  gap: 7px;
}
.page-about .team-list > .team-row:nth-child(1) { --w: 43%; }
.page-about .team-list > .team-row:nth-child(2) { --w: 25%; }
.page-about .team-list > .team-row:nth-child(3) { --w: 21%; }
.page-about .team-list > .team-row:nth-child(4) { --w: 11%; }
.page-about .team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.page-about .team-name {
  font-size: 16px;
  color: var(--mist);
}
.page-about .team-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--lime);
}
.page-about .team-bar {
  height: 6px;
  background: rgba(199, 207, 203, .14);
  overflow: hidden;
}
.page-about .team-bar-fill {
  display: block;
  width: var(--w, 0);
  height: 100%;
  background: linear-gradient(90deg, var(--lime), rgba(110, 139, 132, .9));
  transform-origin: left center;
  animation: aboutBarGrow .6s var(--ease) both;
}
.page-about .team-duty {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--silver);
}
.page-about .about-team-media {
  margin: 0;
}
.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
@keyframes aboutBarGrow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* 标准与荣誉 */
.page-about .standard-grid {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}
.page-about .standard-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .standard-num {
  grid-column: 1;
  grid-row: 1;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--orange);
}
.page-about .standard-card h3 {
  grid-column: 2;
  margin: 0;
  font-size: 18px;
  color: var(--mist);
}
.page-about .standard-card p {
  grid-column: 2;
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver);
}
.page-about .honor-wrap {
  margin-top: 36px;
}
.page-about .honor-intro {
  margin: 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--verdigris);
}
.page-about .honor-grid {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .honor-card {
  position: relative;
  padding: 20px 18px;
  background: var(--about-panel);
  border: 1px solid var(--line-strong);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}
.page-about .honor-card:hover,
.page-about .honor-card:focus-within {
  border-color: var(--lime);
  transform: translateY(-2px);
}
.page-about .honor-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--lime);
}
.page-about .honor-front h3 {
  margin: 10px 0 0;
  font-size: 17px;
  color: var(--mist);
}
.page-about .honor-back p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--silver);
}

/* 合作 */
.page-about .partner-grid {
  display: grid;
  gap: 14px;
}
.page-about .partner-card {
  padding: 22px 20px;
  background: var(--about-panel);
  border: 1px solid var(--line);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}
.page-about .partner-card:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
}
.page-about .partner-card h3 {
  margin: 14px 0 10px;
  font-size: 18px;
  color: var(--mist);
}
.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--silver);
}
.page-about .partner-fit {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
  font-size: 13px !important;
  color: var(--verdigris) !important;
}
.page-about .partner-note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}
.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: 34px;
  padding: 28px 22px;
  background: var(--brown);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--lime);
}
.page-about .cta-copy h2 {
  margin: 0;
  font-size: clamp(21px, 5vw, 28px);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--mist);
}
.page-about .cta-copy p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 平板及以上 */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding-top: 44px;
  }
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: center;
    gap: 48px;
  }
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 40px;
  }
  .page-about .about-origin-note {
    margin-top: 42px;
  }
  .page-about .version-list {
    padding-left: 34px;
  }
  .page-about .version-item {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 26px 0;
  }
  .page-about .version-item::before {
    left: -34px;
    top: 36px;
  }
  .page-about .version-year {
    font-size: 58px;
  }
  .page-about .version-meta {
    margin-top: 4px;
  }
  .page-about .about-data-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 44px;
  }
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 44px;
  }
  .page-about .honor-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .honor-card {
    min-height: 138px;
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 32px 30px;
  }
  .page-about .cta-actions {
    justify-content: flex-end;
  }
}

/* 桌面：荣誉卡片翻转 */
@media (hover: hover) and (min-width: 760px) {
  .page-about .honor-card {
    display: grid;
  }
  .page-about .honor-front,
  .page-about .honor-back {
    grid-area: 1 / 1;
    transition: opacity .35s var(--ease), transform .35s var(--ease);
  }
  .page-about .honor-back {
    opacity: 0;
    transform: translateY(8px);
    pointer-events: none;
  }
  .page-about .honor-card:hover .honor-front,
  .page-about .honor-card:focus-within .honor-front {
    opacity: 0;
    transform: translateY(-8px);
  }
  .page-about .honor-card:hover .honor-back,
  .page-about .honor-card:focus-within .honor-back {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 大屏 */
@media (min-width: 1080px) {
  .page-about .about-hero-grid {
    gap: 64px;
  }
  .page-about .tactics-svg {
    width: 380px;
  }
  .page-about .version-item {
    grid-template-columns: 210px minmax(0, 1fr);
  }
  .page-about .version-year {
    font-size: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-bar-fill {
    animation: none;
  }
  .page-about .honor-card,
  .page-about .partner-card,
  .page-about .version-chip {
    transition: none;
  }
}