.page-about {
  --about-rail: 108px;
  --about-gap: clamp(16px, 2vw, 24px);
  color: var(--white);
  font-family: var(--font-body);
  padding-block: clamp(16px, 2.4vw, 32px) clamp(48px, 6vw, 96px);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .mono {
  font-family: var(--font-mono);
}

.page-about .serif {
  font-family: var(--font-editorial);
}

/* ---------- hero ---------- */
.page-about .story-hero {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(16px, 2vw, 28px);
}

.page-about .story-hero h1 {
  font-size: clamp(2.1rem, 8vw, 5rem);
  max-width: 18ch;
}

.page-about .hero-lede {
  margin-top: clamp(14px, 2vw, 20px);
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.2vw, 1.075rem);
  line-height: 1.85;
  color: var(--fog);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .story-facts {
  background: var(--sand);
  color: var(--deep);
  border: 2px solid var(--deep);
  box-shadow: var(--hard-shadow-orange);
  padding: clamp(16px, 2vw, 22px);
  align-self: start;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .facts-title {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(7, 20, 38, 0.62);
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(7, 20, 38, 0.28);
}

.page-about .fact-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding-block: 11px;
  border-bottom: 1px dashed rgba(7, 20, 38, 0.28);
}

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

.page-about .fact-label {
  font-size: 0.82rem;
  color: rgba(7, 20, 38, 0.72);
}

.page-about .fact-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
}

.page-about .about-hero-media {
  margin: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .about-hero-media img,
.page-about .team-media img,
.page-about .honor-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
}

/* ---------- section 公共 ---------- */
.page-about .about-section {
  margin-top: clamp(52px, 6.5vw, 96px);
}

.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 16px;
  border-left: 4px solid var(--orange);
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .section-number {
  font-family: var(--font-editorial);
  font-style: italic;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .section-head h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  max-width: 22ch;
}

.page-about .section-note {
  font-family: var(--font-editorial);
  font-style: italic;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--fog);
  max-width: 46ch;
}

/* ---------- 01 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .origin-main p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--fog);
  margin-bottom: 1em;
}

.page-about .origin-main p:last-child {
  margin-bottom: 0;
}

.page-about .side-note {
  background: var(--panel-2);
  border: 2px solid var(--line);
  box-shadow: var(--hard-shadow);
  padding: clamp(16px, 2.2vw, 24px);
  height: 100%;
}

.page-about .side-note__kicker {
  font-style: italic;
  font-size: 1.02rem;
  color: var(--cyan);
  margin-bottom: 14px;
}

.page-about .side-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .side-note__list li {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--fog);
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .side-note__list li strong {
  display: block;
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 3px;
}

/* ---------- 02 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 224, 0.12));
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 8px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 10px;
  width: 10px;
  height: 10px;
  background: var(--orange);
  border: 2px solid var(--deep);
}

.page-about .tl-year {
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .tl-body {
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--hard-shadow);
  padding: clamp(16px, 2.2vw, 22px);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .tl-body h3 {
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  margin-bottom: 8px;
}

.page-about .tl-body p {
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .tl-item--end .tl-body {
  border-color: rgba(255, 122, 47, 0.55);
}

.page-about .tl-item--end {
  background-image: repeating-linear-gradient(
    45deg,
    rgba(217, 198, 163, 0.09) 0 8px,
    transparent 8px 18px
  );
}

/* ---------- 03 团队 ---------- */
.page-about .team-roster {
  display: grid;
  gap: var(--about-gap);
}

.page-about .team-card {
  background: var(--panel-2);
  border: 2px solid var(--line);
  padding: clamp(16px, 2.2vw, 22px);
  box-shadow: 4px 4px 0 rgba(53, 242, 224, 0.1);
}

.page-about .team-card--lead {
  background: var(--panel);
  border-color: rgba(53, 242, 224, 0.45);
  box-shadow: var(--hard-shadow);
}

.page-about .team-count {
  font-size: clamp(2.2rem, 5vw, 3rem);
  line-height: 1;
  color: var(--cyan);
  display: block;
  margin-bottom: 6px;
}

.page-about .team-card h3 {
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  margin-bottom: 8px;
}

.page-about .team-card p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .team-flow {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .team-flow__copy h3 {
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  margin-bottom: 14px;
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .flow-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  background: var(--panel);
  border: 2px solid var(--line);
  padding: 12px 14px;
}

.page-about .step-no {
  font-size: 0.78rem;
  color: var(--orange);
  letter-spacing: 0.08em;
  grid-row: span 2;
  align-self: center;
}

.page-about .step-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.page-about .step-desc {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .team-media {
  margin: 0;
}

/* ---------- 04 版本治理 ---------- */
.page-about .version-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .version-diagram {
  background: var(--panel);
  border: 2px solid var(--line);
  padding: clamp(12px, 2vw, 20px);
  box-shadow: var(--hard-shadow);
}

.page-about .vtree {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .vtree__box {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
}

.page-about .vtree__box--focus {
  stroke: var(--cyan);
}

.page-about .vtree__line {
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-dasharray: 5 5;
}

.page-about .vtree__text {
  font-family: var(--font-mono);
  font-size: 14px;
  fill: var(--fog);
}

.page-about .vtree__text--focus {
  fill: var(--white);
}

.page-about .vtree__code {
  font-family: var(--font-mono);
  font-size: 15px;
  fill: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .version-copy p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--fog);
  margin-bottom: 1em;
}

.page-about .version-copy p .mono {
  color: var(--cyan);
  font-size: 0.9rem;
}

.page-about .version-demo {
  border: 2px solid var(--line);
  background: var(--panel-2);
  margin-bottom: 1em;
}

.page-about .version-demo summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 12px 16px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  list-style: none;
}

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

.page-about .version-demo[open] summary {
  border-bottom: 2px solid var(--line);
}

.page-about .version-demo ol {
  margin: 0;
  padding: 14px 18px 16px 34px;
  display: grid;
  gap: 8px;
  color: var(--fog);
  font-size: 0.87rem;
  line-height: 1.75;
}

.page-about .version-filter {
  border-left: 3px solid var(--sand);
  padding-left: 14px;
  color: var(--white) !important;
  font-size: 0.9rem !important;
}

/* ---------- 05 覆盖 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .coverage-cell {
  display: grid;
  gap: 8px;
  background: var(--panel);
  border: 2px solid var(--line);
  padding: clamp(14px, 2vw, 20px);
}

.page-about .coverage-cell--focus {
  background: var(--panel-2);
  border-color: rgba(255, 122, 47, 0.6);
  box-shadow: var(--hard-shadow-orange);
}

.page-about .cov-num {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--white);
  letter-spacing: 0.02em;
}

.page-about .coverage-cell--focus .cov-num {
  color: var(--orange);
}

.page-about .cov-unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--fog);
}

.page-about .cov-label {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .coverage-foot {
  margin-top: clamp(18px, 2.4vw, 26px);
  max-width: 68ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--fog);
}

.page-about .inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 224, 0.5);
  margin-left: 6px;
  white-space: nowrap;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 06 荣誉 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .honor-media {
  margin: 0;
}

.page-about .honor-badge {
  display: inline-block;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--deep);
  background: var(--sand);
  padding: 7px 12px;
  margin-bottom: 16px;
}

.page-about .honor-copy p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--fog);
  margin-bottom: 1em;
}

.page-about .honor-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .honor-list li {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--white);
  padding-left: 20px;
  position: relative;
}

.page-about .honor-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .honor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .section-head {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 22px;
    align-items: center;
    row-gap: 4px;
  }

  .page-about .section-number {
    grid-row: 1 / span 2;
    align-self: center;
  }

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

  .page-about .team-flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .story-hero {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .story-hero__copy {
    grid-column: 1 / span 8;
  }

  .page-about .story-facts {
    grid-column: 9 / span 4;
  }

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

  .page-about .tl-item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 30px;
    align-items: start;
  }

  .page-about .timeline {
    padding-left: 0;
  }

  .page-about .timeline::before {
    left: calc(var(--about-rail) + 13px);
    top: 18px;
    bottom: 18px;
  }

  .page-about .tl-item::before {
    left: calc(var(--about-rail) + 9px);
    top: 20px;
  }

  .page-about .tl-year {
    display: block;
    text-align: right;
    padding-top: 14px;
    font-size: 1.35rem;
  }

  .page-about .tl-body:hover {
    border-color: var(--cyan);
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 rgba(53, 242, 224, 0.2);
  }

  .page-about .team-roster {
    grid-template-columns: minmax(0, 9fr) minmax(0, 5fr) minmax(0, 4fr);
    align-items: stretch;
  }

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

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

  .page-about .honor-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }
}

@media (min-width: 1200px) {
  .page-about .team-roster {
    grid-template-columns: minmax(0, 9fr) minmax(0, 5fr) minmax(0, 4fr);
  }

  .page-about .coverage-cell--focus {
    grid-column: span 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-body {
    transition: none;
  }

  .page-about .tl-body:hover {
    transform: none;
  }
}
<<<END>>>