.page-about {
  --about-line: rgba(246, 239, 226, 0.12);
  background-color: var(--ink-deep);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 3rem) 0 3rem;
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(47, 232, 206, 0.15) 0%, rgba(27, 18, 54, 0) 58%),
    radial-gradient(95% 70% at 0% 100%, rgba(30, 127, 191, 0.22) 0%, rgba(13, 10, 28, 0) 62%),
    linear-gradient(162deg, var(--ink-night) 0%, var(--ink-deep) 82%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: 8%;
  width: 48%;
  height: 82%;
  background: linear-gradient(150deg, rgba(47, 232, 206, 0.12), rgba(233, 179, 106, 0.06));
  clip-path: polygon(20% 0, 100% 0, 80% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  list-style: none;
  margin: 0 0 2.25rem;
  padding: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--sand-gold);
  border-bottom-color: var(--sand-gold);
}

.page-about .breadcrumb-sep {
  color: rgba(168, 182, 198, 0.45);
}

.page-about .breadcrumb-current {
  color: var(--sand-gold);
}

.page-about .about-hero-eyebrow,
.page-about .section--stage .eyebrow {
  color: var(--cyber-cyan);
}

.page-about .about-hero-title {
  margin: 1rem 0 0;
  max-width: 20em;
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: clamp(2.1rem, 7.2vw, 4.6rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .about-hero-title span {
  display: inline-block;
  font-weight: 700;
  color: var(--sand-gold);
  letter-spacing: -0.01em;
}

.page-about .about-hero-lede {
  margin: 1.5rem 0 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.35rem 1rem;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-hero-facts > li {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-fact-num {
  font-size: clamp(1.35rem, 4.4vw, 1.9rem);
  line-height: 1;
  color: var(--sand-gold);
  letter-spacing: 0.04em;
}

.page-about .about-fact-label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* ---------- 通用栏头 ---------- */
.page-about .about-head {
  max-width: 46rem;
}

.page-about .about-head-title {
  margin: 0.8rem 0 0;
  font-size: clamp(1.55rem, 4.4vw, 2.55rem);
  line-height: 1.26;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-head--paper .about-head-title {
  color: var(--paper-ink);
}

.page-about .about-head-lede {
  margin: 1rem 0 0;
  max-width: 34em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-head--paper .about-head-lede {
  color: rgba(36, 26, 18, 0.74);
}

.page-about .about-link-row {
  margin: 2.25rem 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
}

.page-about .about-timeline-veil {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 0;
  opacity: 0.2;
  pointer-events: none;
}

.page-about .about-timeline-veil img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-timeline > .container {
  position: relative;
  z-index: 1;
}

.page-about .tl-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0 2.75rem;
}

.page-about .tl-index-link {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tl-index-link:hover,
.page-about .tl-index-link:focus-visible {
  color: var(--ink-deep);
  background: var(--cyber-cyan);
  border-color: var(--cyber-cyan);
}

.page-about .tl-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyber-cyan) 0%, rgba(47, 232, 206, 0.4) 55%, rgba(47, 232, 206, 0) 100%);
  pointer-events: none;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 2.75rem 2.25rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sand-gold);
  box-shadow: 0 0 0 4px rgba(233, 179, 106, 0.16);
}

.page-about .tl-body h3 {
  margin: 0.5rem 0 0.8rem;
  font-size: clamp(1.12rem, 3vw, 1.5rem);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl-body > p {
  margin: 0 0 0.95rem;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .tl-body > p.tl-result {
  margin-bottom: 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--cyber-cyan);
  color: var(--paper);
  font-size: 0.94rem;
}

.page-about .tl-result .mono {
  margin-right: 0.55rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--sand-gold);
}

/* ---------- 版本记录 ---------- */
.page-about .record-list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.85rem;
}

.page-about .record-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.55rem 1rem;
  align-items: baseline;
}

.page-about .record-phase {
  grid-column: 1;
  grid-row: 1;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper-ink);
}

.page-about .record-count {
  grid-column: 2;
  grid-row: 1;
  text-align: right;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--lake-blue);
}

.page-about .record-bar {
  grid-column: 1 / -1;
  grid-row: 2;
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(36, 26, 18, 0.1);
  overflow: hidden;
}

.page-about .record-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--lake-blue), var(--lake-light));
}

.page-about .record-fill--1 { width: 19%; }
.page-about .record-fill--2 { width: 30%; }
.page-about .record-fill--3 { width: 34%; }
.page-about .record-fill--4 { width: 17%; }

.page-about .record-text {
  grid-column: 1 / -1;
  grid-row: 3;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: rgba(36, 26, 18, 0.72);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 2.75rem;
}

.page-about .team-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.6rem;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 0.35rem 1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-dark);
}

.page-about .team-num {
  grid-column: 1;
  grid-row: 1;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--sand-gold);
  letter-spacing: 0.03em;
}

.page-about .team-name {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .team-item p {
  grid-column: 2;
  margin: 0.4rem 0 0;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .img-frame {
  margin: 0;
}

.page-about .img-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team-figure {
  position: relative;
}

/* ---------- 覆盖与规模 ---------- */
.page-about .scale-grid {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.25rem;
}

.page-about .scale-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 1.25rem;
}

.page-about .scale-item {
  padding-top: 0.85rem;
  border-top: 1px solid var(--line-paper);
}

.page-about .scale-num {
  display: block;
  font-size: clamp(1.5rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lake-blue);
}

.page-about .scale-label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.82rem;
  line-height: 1.62;
  color: rgba(36, 26, 18, 0.72);
}

/* ---------- 维护节奏 ---------- */
.page-about .upkeep-list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.75rem;
}

.page-about .upkeep-item {
  padding-left: 1.1rem;
  border-left: 2px solid rgba(47, 232, 206, 0.4);
}

.page-about .upkeep-cycle {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--sand-gold);
}

.page-about .upkeep-item h3 {
  margin: 0.55rem 0 0.6rem;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .upkeep-item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .upkeep-note {
  margin: 2.25rem 0 0;
  max-width: 40em;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line-dark);
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  padding: 3.5rem 0 4rem;
  background:
    radial-gradient(100% 90% at 100% 0%, rgba(47, 232, 206, 0.18) 0%, rgba(27, 18, 54, 0) 60%),
    linear-gradient(140deg, var(--ink-night) 0%, #2b1b52 58%, #17324d 100%);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyber-cyan), var(--sand-gold), rgba(226, 84, 44, 0.7));
}

.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
  max-width: 44rem;
}

.page-about .about-cta .eyebrow {
  color: var(--cyber-cyan);
}

.page-about .about-cta-title {
  margin: 0.85rem 0 0;
  font-size: clamp(1.5rem, 4.6vw, 2.4rem);
  line-height: 1.3;
  letter-spacing: -0.025em;
  font-weight: 300;
  color: var(--paper);
}

.page-about .about-cta-lede {
  margin: 1rem 0 0;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 721px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 4rem) 0 3.75rem;
  }

  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-hero-lede {
    font-size: 1.05rem;
  }

  .page-about .about-timeline-veil {
    opacity: 0.26;
  }

  .page-about .upkeep-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .scale-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta {
    padding: 4.5rem 0 5rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 901px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 5rem) 0 5rem;
  }

  .page-about .about-hero-lede {
    max-width: 36em;
    font-size: 1.08rem;
  }

  .page-about .about-hero-facts {
    max-width: 52rem;
  }

  .page-about .tl-index {
    position: sticky;
    top: calc(var(--header-h-compact) + 0.75rem);
    z-index: 3;
    margin: 2.25rem 0 3rem;
    padding: 0.6rem 0;
    background: linear-gradient(180deg, rgba(27, 18, 54, 0.94), rgba(27, 18, 54, 0.72));
    backdrop-filter: blur(4px);
  }

  .page-about .tl-list::before {
    left: 7px;
  }

  .page-about .tl-item {
    padding: 0 0 4rem 3.5rem;
  }

  .page-about .tl-item::before {
    left: 1px;
    top: 0.62rem;
    width: 14px;
    height: 14px;
  }

  .page-about .tl-item:nth-child(1) .tl-body { max-width: 42rem; }
  .page-about .tl-item:nth-child(2) .tl-body { max-width: 36rem; margin-left: 9%; }
  .page-about .tl-item:nth-child(3) .tl-body { max-width: 40rem; margin-left: 3%; }
  .page-about .tl-item:nth-child(4) .tl-body { max-width: 34rem; margin-left: 13%; }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-team-figure {
    position: sticky;
    top: calc(var(--header-h-compact) + 2rem);
  }

  .page-about .scale-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 3.5rem;
    align-items: center;
    margin-top: 2.75rem;
  }

  .page-about .scale-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem 1.5rem;
  }

  .page-about .record-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.25rem 3rem;
  }

  .page-about .upkeep-list {
    gap: 2.25rem;
    margin-top: 2.75rem;
  }

  .page-about .about-cta {
    padding: 5.5rem 0 6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb-link,
  .page-about .tl-index-link {
    transition: none;
  }
}
<<<END>>>