.page-about {
  --about-text: #D6E2DD;
  --about-dim: #93A7A0;
  --about-rail: 168px;
  --hex: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: clamp(20px, 3vw, 34px);
  font-size: 13px;
  letter-spacing: 0.04em;
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--about-dim);
}
.page-about .breadcrumbs a {
  color: var(--teal-soft);
  text-decoration: none;
}
.page-about .breadcrumbs a:hover {
  color: var(--amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 38px) 0 clamp(4px, 1vw, 12px);
}

.page-about .hero-collage {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 30px);
}

.page-about .hero-main {
  background: var(--paper);
  color: var(--brown);
  border: var(--print);
  box-shadow: inset 8px 0 0 var(--red), var(--lift);
  padding: clamp(22px, 3vw, 42px) clamp(20px, 2.8vw, 38px);
  padding-left: clamp(30px, 4vw, 56px);
}

.page-about .hero-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
  border-bottom: 2px solid var(--red);
  padding-bottom: 4px;
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .hero-main h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 4.4vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(14px, 1.8vw, 22px);
  max-width: 20ch;
}

.page-about .hero-lede {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  margin: 0;
  color: var(--brown);
  max-width: 46ch;
}

.page-about .hero-stats {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .stat-block {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 16px 20px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  flex: 0 0 auto;
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--about-dim);
}

@media (min-width: 900px) {
  .page-about .hero-collage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .stat-block:nth-child(1) { margin-left: 0; }
  .page-about .stat-block:nth-child(2) { margin-left: 26px; }
  .page-about .stat-block:nth-child(3) { margin-left: 10px; }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  margin-top: clamp(52px, 7vw, 104px);
}

.page-about .about-text {
  font-size: clamp(15px, 1.4vw, 16.5px);
  line-height: 1.85;
  color: var(--about-text);
  margin: 0 0 16px;
  max-width: 62ch;
}
.page-about .about-text:last-child {
  margin-bottom: 0;
}

/* ---------- 立场 ---------- */
.page-about .stance-block {
  border-top: 1px solid var(--line);
  padding-top: clamp(24px, 3.5vw, 44px);
}

.page-about .stance-block h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 12px 0 clamp(18px, 2.4vw, 30px);
  max-width: 22ch;
}

.page-about .stance-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.2vw, 32px);
}

@media (min-width: 820px) {
  .page-about .stance-cols {
    grid-template-columns: 1fr 1fr;
    gap: clamp(24px, 4vw, 72px);
  }
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-note {
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .cover-deck {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
  margin: clamp(20px, 3vw, 34px) 0;
}

.page-about .cover-card {
  background: var(--paper);
  color: var(--brown);
  border: var(--print);
  box-shadow: var(--lift);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .cover-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 10px;
  color: var(--brown);
}

.page-about .cover-card p {
  font-size: 14.5px;
  line-height: 1.78;
  margin: 0;
  color: var(--brown);
}

.page-about .cover-count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  margin-bottom: 12px;
}

@media (min-width: 760px) {
  .page-about .cover-deck {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .cover-card:nth-child(1) { margin-top: 0; }
  .page-about .cover-card:nth-child(2) { margin-top: 26px; }
  .page-about .cover-card:nth-child(3) { margin-top: 13px; }
}

.page-about .cover-card--basket {
  border-left: 5px solid var(--teal);
}
.page-about .cover-card--misc {
  border-left: 5px solid var(--amber);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(20px, 3vw, 30px);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

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

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

.page-about .team-chart {
  margin-top: clamp(24px, 3vw, 40px);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .chart-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-dim);
  margin: 0 0 16px;
}

.page-about .team-bar {
  display: block;
  width: 100%;
  height: 44px;
}

.page-about .team-legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .team-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--about-text);
}

.page-about .team-legend b {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--paper);
  margin-left: 2px;
}

.page-about .legend-swatch {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}
.page-about .legend-swatch--editor { background: var(--red); }
.page-about .legend-swatch--tech { background: var(--teal); }
.page-about .legend-swatch--service { background: var(--amber); }
.page-about .legend-swatch--ops { background: var(--teal-soft); }

/* ---------- 版本演进 ---------- */
.page-about .version-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

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

.page-about .version-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(24px, 3vw, 40px);
}

.page-about .version-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.page-about .version-rail::-webkit-scrollbar {
  display: none;
}

.page-about .version-stop {
  position: relative;
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 9px;
  padding: 11px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--about-dim);
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-about .stop-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  background: var(--line);
  transition: background-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .stop-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.page-about .stop-name {
  font-size: 13px;
  letter-spacing: 0.02em;
}

.page-about .version-stop:hover,
.page-about .version-stop:focus-visible,
.page-about .version-stop.is-active,
.page-about .version-stop[aria-current="true"] {
  color: var(--paper);
  border-color: var(--red);
}

.page-about .version-stop:hover .stop-dot,
.page-about .version-stop:focus-visible .stop-dot,
.page-about .version-stop.is-active .stop-dot,
.page-about .version-stop[aria-current="true"] .stop-dot {
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(192, 73, 43, 0.24);
}

.page-about .version-flow {
  display: grid;
  gap: clamp(22px, 3.2vw, 40px);
}

.page-about .version-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  padding: clamp(20px, 2.8vw, 34px);
  scroll-margin-top: 150px;
  transition: border-left-color 0.25s ease;
}

.page-about .version-item.is-active {
  border-left-color: var(--red);
}

.page-about .version-era {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-dim);
  margin: 0 0 9px;
}

.page-about .version-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.3vw, 26px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about .version-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .version-cell {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .version-cell p {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .version-cell--fix p {
  color: var(--paper);
}

.page-about .version-outcome {
  margin-top: clamp(22px, 3vw, 34px);
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 3px solid var(--amber);
}

@media (min-width: 640px) {
  .page-about .version-body {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }
}

@media (min-width: 880px) {
  .page-about .version-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
  .page-about .version-rail {
    position: sticky;
    top: clamp(118px, 15vh, 164px);
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 2px solid var(--line);
  }
  .page-about .version-stop {
    background: transparent;
    border: 0;
    border-radius: 0;
    padding: 15px 0 15px 20px;
    margin-left: -2px;
    width: 100%;
  }
  .page-about .version-stop:hover,
  .page-about .version-stop:focus-visible,
  .page-about .version-stop.is-active,
  .page-about .version-stop[aria-current="true"] {
    border-color: transparent;
  }
  .page-about .stop-dot {
    position: absolute;
    left: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 11px;
    height: 11px;
  }
}

/* ---------- 云南 ---------- */
.page-about .yunnan-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(20px, 3vw, 30px);
}

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

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

.page-about .yunnan-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .fact {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
  padding: 16px 18px;
}

.page-about .fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--teal-soft);
  margin-bottom: 6px;
}

.page-about .fact-icp {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  color: var(--teal-soft);
  margin-bottom: 6px;
  word-break: break-all;
}

.page-about .fact-label {
  display: block;
  font-size: 13px;
  line-height: 1.55;
  color: var(--about-dim);
}

@media (min-width: 900px) {
  .page-about .yunnan-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .eco-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .eco-node {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 16px 18px;
}

.page-about .eco-hex {
  width: 24px;
  height: 28px;
  flex: 0 0 auto;
  clip-path: var(--hex);
  display: block;
}
.page-about .eco-hex--data { background: var(--teal); }
.page-about .eco-hex--visual { background: var(--amber); }
.page-about .eco-hex--writer { background: var(--teal-soft); }
.page-about .eco-hex--local { background: var(--red-soft); }

.page-about .eco-node h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
  margin: 0;
}

.page-about .eco-node h3 b {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
  margin-left: 4px;
}

.page-about .eco-node p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
  margin: 0;
}

.page-about .eco-core {
  clip-path: var(--hex);
  background: var(--red);
  color: var(--paper);
  min-height: 196px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-align: center;
  padding: 26px 40px;
}

.page-about .eco-core-brand {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.06em;
  margin: 0;
  color: var(--paper);
}

.page-about .eco-core-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  margin: 4px 0 0;
  color: var(--paper);
}

.page-about .eco-core-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  margin: 0;
  color: rgba(244, 237, 225, 0.82);
}

.page-about .eco-note {
  margin-top: clamp(20px, 2.8vw, 32px);
}

@media (min-width: 900px) {
  .page-about .eco-map {
    grid-template-columns: minmax(0, 1fr) minmax(210px, 0.85fr) minmax(0, 1fr);
    grid-template-areas:
      ". a ."
      "b core c"
      ". d .";
    gap: 18px;
    align-items: center;
  }
  .page-about .eco-node--a { grid-area: a; }
  .page-about .eco-node--b { grid-area: b; }
  .page-about .eco-node--c { grid-area: c; }
  .page-about .eco-node--d { grid-area: d; }
  .page-about .eco-core { grid-area: core; }
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .next-card {
  display: block;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--line);
  padding: 20px 18px;
  transition: transform 0.18s ease, border-bottom-color 0.18s ease;
}

.page-about .next-card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .next-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-dim);
  margin: 0;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-4px);
  border-bottom-color: var(--red);
}

.page-about .next-card:hover h3,
.page-about .next-card:focus-visible h3 {
  color: var(--amber);
}

@media (min-width: 680px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .version-stop,
  .page-about .stop-dot,
  .page-about .version-item,
  .page-about .next-card {
    transition: none;
  }
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
</final>