.page-about {
  --about-rail: 120px;
  color: var(--text);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
  outline: none;
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: clamp(26px, 5vw, 56px) 0 clamp(34px, 5vw, 64px);
}

.page-about .hero-copy {
  min-width: 0;
}

.page-about .about-hero .display {
  margin: 14px 0 18px;
  font-size: clamp(32px, 6vw, 72px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .lede {
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
  margin: 0 0 24px;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .hero-figure {
  margin: 0;
  min-width: 0;
}

.page-about .hero-figure img,
.page-about .field-figure img,
.page-about .partner-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.55) hue-rotate(-8deg) brightness(0.9);
}

.page-about .hero-figure figcaption,
.page-about .field-figure figcaption,
.page-about .partner-figure figcaption {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-band {
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
  background:
    linear-gradient(90deg, rgba(43, 245, 160, 0.07), rgba(6, 21, 18, 0) 62%),
    repeating-linear-gradient(90deg, rgba(30, 66, 56, 0.55) 0 1px, transparent 1px 24px);
}

.page-about .band-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 28px var(--pad);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
}

.page-about .band-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--grid-line);
  min-width: 0;
}

.page-about .band-item--accent {
  border-left-color: var(--amber);
}

.page-about .band-num {
  font-size: clamp(28px, 4.4vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .band-item--accent .band-num {
  color: var(--amber);
}

.page-about .band-plus {
  color: var(--signal);
  font-size: 0.6em;
  margin-left: 2px;
}

.page-about .band-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .ledger {
  display: block;
}

.page-about .ledger-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(36px, 5vw, 66px) 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .ledger-row:last-child {
  border-bottom: 0;
}

.page-about .rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.page-about .rail-idx {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .rail-name {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .col {
  min-width: 0;
}

.page-about .section-title {
  margin: 0 0 16px;
  font-size: clamp(23px, 3.4vw, 36px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .col-lede {
  max-width: 62ch;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .prose p,
.page-about .prose-para {
  max-width: 66ch;
  margin: 0 0 1.2em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .prose p:last-child,
.page-about .prose-para:last-child {
  margin-bottom: 0;
}

.page-about .prose-para {
  margin-top: 24px;
  padding-left: 16px;
  border-left: 2px solid var(--signal-deep);
}

.page-about .col-foot {
  margin: 22px 0 0;
}

.page-about .text-link {
  font-size: 14px;
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-deep);
  padding-bottom: 2px;
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--ink-void);
  background: var(--signal);
  border-bottom-color: var(--signal);
  outline: none;
}

/* 时间轴 */
.page-about .timeline {
  position: relative;
  margin-top: 6px;
  padding-left: 30px;
  border-left: 1px solid var(--grid-line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 8px;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--ink-void);
  border: 1px solid var(--signal);
}

.page-about .tl-item[open]::before {
  background: var(--signal);
}

.page-about .tl-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .tl-summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .tl-item[open] .tl-summary::after {
  content: "收起";
}

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

.page-about .tl-summary .tag--ver {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .tl-body {
  padding: 12px 0 0;
}

.page-about .tl-body p {
  max-width: 64ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* 采集流程 */
.page-about .field-figure {
  margin: 26px 0 8px;
}

.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-about .flow-step {
  min-width: 0;
  padding-top: 12px;
  border-top: 2px solid var(--signal-deep);
}

.page-about .flow-step .mono {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .flow-step strong {
  display: block;
  margin: 6px 0 6px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

/* 团队带状图 */
.page-about .team-bar {
  display: flex;
  height: 62px;
  margin: 26px 0 18px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  overflow: visible;
  background: var(--ink-deep);
}

.page-about .team-seg {
  position: relative;
  min-width: 0;
  border-right: 1px solid var(--grid-line);
  transition: background 220ms ease, filter 220ms ease;
}

.page-about .team-seg:last-child {
  border-right: 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .team-seg:first-child {
  border-radius: var(--radius) 0 0 var(--radius);
}

.page-about .team-seg::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 10px;
  border: 1px solid var(--grid-line);
  border-radius: 8px;
  background: var(--ink-raised);
  color: var(--text);
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
  z-index: 2;
}

.page-about .team-seg:hover::after,
.page-about .team-seg:focus-visible::after {
  opacity: 1;
}

.page-about .team-seg:hover,
.page-about .team-seg:focus-visible {
  filter: brightness(1.35);
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-about .seg-a {
  flex: 19 1 0;
  background: linear-gradient(180deg, rgba(43, 245, 160, 0.42), rgba(43, 245, 160, 0.14));
}

.page-about .seg-b {
  flex: 11 1 0;
  background: linear-gradient(180deg, rgba(43, 245, 160, 0.26), rgba(43, 245, 160, 0.08));
}

.page-about .seg-c {
  flex: 8 1 0;
  background: linear-gradient(180deg, rgba(255, 182, 61, 0.26), rgba(255, 182, 61, 0.08));
}

.page-about .seg-d {
  flex: 4 1 0;
  background: linear-gradient(180deg, rgba(157, 181, 172, 0.24), rgba(157, 181, 172, 0.08));
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}

.page-about .team-legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) 40px;
  align-items: baseline;
  gap: 6px 10px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .team-legend li:last-child {
  border-bottom: 0;
}

.page-about .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  align-self: center;
}

.page-about .dot-a { background: var(--signal); }
.page-about .dot-b { background: var(--signal-deep); }
.page-about .dot-c { background: var(--amber); }
.page-about .dot-d { background: var(--muted); }

.page-about .legend-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .legend-num {
  font-size: 18px;
  color: var(--amber);
  text-align: right;
}

.page-about .legend-note {
  grid-column: 2 / -1;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 合作生态 */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .partner-col {
  min-width: 0;
}

.page-about .partner-figure {
  margin: 0;
}

.page-about .partner-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .partner-list li {
  padding: 14px 0;
  border-top: 1px solid var(--grid-line);
}

.page-about .partner-list .mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .partner-list strong {
  display: block;
  font-size: 16px;
  color: var(--text);
  margin-bottom: 4px;
}

.page-about .partner-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* 更新节奏 */
.page-about .rhythm-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin-top: 26px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--grid-line);
}

.page-about .rhythm-cell {
  padding: 16px 18px;
  background: var(--ink-raised);
  min-width: 0;
}

.page-about .rhythm-cell .mono {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--signal);
}

.page-about .rhythm-cell p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .col-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

@media (min-width: 640px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .team-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
    border-bottom: 1px solid var(--grid-line);
  }

  .page-about .band-inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 34px var(--pad);
  }

  .page-about .ledger-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .rail {
    flex-direction: column;
    gap: 8px;
    position: sticky;
    top: 110px;
    align-self: start;
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .partner-col--offset {
    margin-top: 72px;
  }
}

@media (min-width: 1120px) {
  .page-about .team-bar {
    height: 72px;
  }

  .page-about .team-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-seg,
  .page-about .team-seg::after {
    transition: none;
  }
}
<<<END>>>