/* ===== 品牌概况 · 页面专属样式 ===== */
.page-about {
  background: var(--night);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about figure {
  margin: 0;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.65rem, 4.2vw, 2.7rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  color: var(--paper);
  max-width: 17em;
}

.page-about .about-copy {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(244, 241, 230, 0.82);
  max-width: 34em;
  margin: 18px 0 0;
}

.page-about .about-note {
  margin: 24px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--line);
  max-width: 40em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 56px;
  border-bottom: 1px solid rgba(200, 250, 75, 0.14);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at center, rgba(200, 250, 75, 0.18) 1px, transparent 1.3px);
  background-size: 24px 24px;
  -webkit-mask-image: radial-gradient(120% 95% at 88% 0%, #000 0%, transparent 64%);
  mask-image: radial-gradient(120% 95% at 88% 0%, #000 0%, transparent 64%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  line-height: 1.07;
  letter-spacing: -0.01em;
  margin: 16px 0 0;
  max-width: 16em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: rgba(244, 241, 230, 0.84);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-top: 40px;
  max-width: 640px;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: rgba(11, 58, 46, 0.72);
  border: 1px solid rgba(200, 250, 75, 0.2);
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .about-metric__label {
  font-family: var(--font-label);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(244, 241, 230, 0.72);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: 56px 0 8px;
}

.page-about .about-origin__panel {
  display: grid;
  gap: 20px;
  padding: 30px 22px;
  border-radius: var(--radius-lg);
  background: var(--pitch);
  border: 1px solid rgba(200, 250, 75, 0.16);
}

.page-about .about-origin__body {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-origin__body .about-copy {
  margin: 18px 0 0;
}

.page-about .about-origin__body .about-copy:first-child {
  margin-top: 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-versions {
  padding: 72px 0 64px;
  background: linear-gradient(180deg, var(--night) 0%, var(--pitch) 45%, var(--night) 100%);
}

.page-about .about-versions__head .about-copy {
  margin-top: 16px;
}

.page-about .version-rail {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  position: relative;
}

.page-about .version-rail::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 25px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(200, 250, 75, 0.55), rgba(155, 211, 47, 0.16));
}

.page-about .version-item {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 0 16px;
  padding-bottom: 28px;
}

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

.page-about .version-pill {
  grid-column: 1;
  align-self: start;
  justify-self: center;
  position: relative;
  z-index: 1;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  text-decoration: none;
  background: var(--moss);
  border: 2px solid rgba(200, 250, 75, 0.5);
  color: var(--paper);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .version-pill__year {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.02em;
  line-height: 1;
}

.page-about .version-pill__tag {
  font-family: var(--font-label);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--lime);
  line-height: 1;
}

.page-about .version-pill:hover,
.page-about .version-pill:focus-visible {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--night);
  transform: translateY(-2px);
}

.page-about .version-pill:hover .version-pill__tag,
.page-about .version-pill:focus-visible .version-pill__tag {
  color: var(--night);
}

.page-about .version-card {
  grid-column: 2;
  padding: 22px 20px;
  border-radius: var(--radius-md);
  background: rgba(5, 35, 28, 0.82);
  border: 1px solid rgba(200, 250, 75, 0.16);
  border-left: 4px solid var(--line);
  box-shadow: 0 22px 46px -38px rgba(0, 0, 0, 0.95);
}

.page-about .version-card--v1 { border-left-color: var(--line); }
.page-about .version-card--v2 { border-left-color: var(--moss); }
.page-about .version-card--v3 { border-left-color: var(--indigo); }
.page-about .version-card--v4 { border-left-color: var(--lime); }

.page-about .version-card__title {
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.03em;
  margin: 0 0 10px;
  color: var(--lime-2);
}

.page-about .version-card p {
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, 0.8);
  max-width: 34em;
}

/* ---------- 数据来源 ---------- */
.page-about .about-data {
  padding: 64px 0 72px;
}

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

.page-about .data-steps {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .data-steps__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid rgba(200, 250, 75, 0.14);
}

.page-about .data-steps__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  color: var(--lime);
  padding-top: 2px;
}

.page-about .data-steps__title {
  margin: 0 0 6px;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .data-steps__item p {
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, 0.78);
  max-width: 32em;
}

.page-about .about-data__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(200, 250, 75, 0.18);
}

.page-about .about-data__figure figcaption {
  margin-top: 12px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 64px 0 72px;
  background: var(--pitch);
  border-radius: 40px 40px 0 0;
  overflow: hidden;
}

.page-about .about-team__banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(200, 250, 75, 0.18);
}

.page-about .about-team__head {
  margin-top: 36px;
}

.page-about .team-grid {
  margin-top: 34px;
  gap: 18px;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px;
  border-radius: var(--radius-md);
  background: rgba(5, 35, 28, 0.72);
  border: 1px solid rgba(200, 250, 75, 0.18);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease),
    background-color 0.24s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(200, 250, 75, 0.55);
  background: rgba(20, 81, 62, 0.8);
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: 2.35rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .team-card__unit {
  font-size: 0.875rem;
  margin-left: 6px;
  letter-spacing: 0.04em;
  color: rgba(200, 250, 75, 0.72);
}

.page-about .team-card__role {
  margin: 0;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, 0.78);
}

.page-about .team-card__duty {
  padding-top: 10px;
  border-top: 1px solid rgba(200, 250, 75, 0.16);
  font-size: 0.875rem;
  color: rgba(244, 241, 230, 0.62);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: 64px 0 56px;
}

.page-about .partner-strip {
  margin-top: 32px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  border-top: 1px solid rgba(200, 250, 75, 0.2);
  border-bottom: 1px solid rgba(200, 250, 75, 0.2);
}

.page-about .partner-strip:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .partner-strip__track {
  display: flex;
  min-width: max-content;
}

.page-about .partner-cell {
  flex: 0 0 auto;
  min-width: 200px;
  padding: 26px 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-right: 1px solid rgba(200, 250, 75, 0.14);
}

.page-about .partner-cell__num {
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .partner-cell__label {
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(244, 241, 230, 0.74);
}

/* ---------- 接下来 ---------- */
.page-about .about-next {
  padding: 56px 0 88px;
}

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

.page-about .next-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .next-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid rgba(200, 250, 75, 0.16);
}

.page-about .next-list li:last-child {
  border-bottom: 1px solid rgba(200, 250, 75, 0.16);
}

.page-about .next-list__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--lime);
  padding-top: 4px;
}

.page-about .next-list__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .next-list__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, 0.78);
  max-width: 32em;
}

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

.page-about .about-next__aside {
  margin: 18px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, 0.68);
  max-width: 38em;
}

.page-about .about-next__aside a {
  color: var(--lime-2);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 11 / 15;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(200, 250, 75, 0.18);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-shell {
    padding-inline: 32px;
  }

  .page-about .about-hero {
    padding: 64px 0 64px;
  }

  .page-about .about-origin__panel {
    padding: 36px 32px;
  }

  .page-about .about-team {
    border-radius: 48px 48px 0 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    padding-inline: 48px;
  }

  .page-about .about-hero {
    padding: 96px 0 80px;
  }

  .page-about .about-origin__panel {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    padding: 48px 44px;
    align-items: start;
  }

  .page-about .about-origin__body {
    padding-top: 42px;
  }

  /* 版本轨道切换为左右交错 */
  .page-about .version-rail::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .version-item {
    grid-template-columns: minmax(0, 1fr) 88px minmax(0, 1fr);
    gap: 0;
    padding-bottom: 40px;
  }

  .page-about .version-pill {
    grid-column: 2;
    grid-row: 1;
    width: 56px;
    height: 56px;
  }

  .page-about .version-item:nth-child(odd) .version-card {
    grid-column: 1;
    grid-row: 1;
    margin-right: 26px;
  }

  .page-about .version-item:nth-child(even) .version-card {
    grid-column: 3;
    grid-row: 1;
    margin-left: 26px;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-versions {
    padding: 88px 0 76px;
  }

  .page-about .about-team,
  .page-about .about-data,
  .page-about .about-partners {
    padding-top: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-pill,
  .page-about .team-card {
    transition: none;
  }

  .page-about .version-pill:hover,
  .page-about .version-pill:focus-visible,
  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}
<<<END>>>