.page-about {
  --about-rail: 26px;
  --about-gap: 16px;
  color: var(--silver);
  background: var(--ink);
  overflow-x: clip;
}

@media (min-width: 768px) {
  .page-about {
    --about-rail: 60px;
    --about-gap: 28px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-rail: 104px;
    --about-gap: 48px;
  }
}

/* ---------- 面包屑与首屏 ---------- */

.page-about .breadcrumbs {
  padding: 26px 0 6px;
}

.page-about .hero {
  padding: 18px 0 0;
}

.page-about .hero__inner {
  display: grid;
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
  }
}

.page-about .hero__kicker {
  color: var(--gold);
  margin: 0;
}

.page-about .hero__title {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(46px, 9vw, 104px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 16px 0 0;
}

.page-about .hero__title span {
  display: block;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.28em;
  line-height: 1.6;
  color: var(--gold);
  margin-top: 20px;
}

@media (min-width: 768px) {
  .page-about .hero__title span {
    font-size: 14px;
    letter-spacing: 0.32em;
  }
}

.page-about .hero__lead-text {
  margin: 24px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

@media (min-width: 768px) {
  .page-about .hero__lead-text {
    font-size: 16px;
    line-height: 1.9;
  }
}

.page-about .hero__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

@media (min-width: 768px) {
  .page-about .hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 24px;
  }
}

.page-about .hero__facts strong {
  display: block;
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--gold-hi);
}

@media (min-width: 768px) {
  .page-about .hero__facts strong {
    font-size: 26px;
  }
}

.page-about .hero__facts span {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .hero__figure {
  margin: 0;
  position: relative;
}

.page-about .hero__figure .media-frame {
  border: 1px solid var(--line);
}

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

.page-about .hero__note {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .hero__note {
    display: block;
    position: absolute;
    right: -42px;
    top: 2px;
    color: var(--mist);
  }
}

/* ---------- 章节索引条 ---------- */

.page-about .stage-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  margin-top: 44px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .stage-jump__key {
  color: var(--mist);
}

.page-about .stage-jump__link {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--silver);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .stage-jump__link:hover,
.page-about .stage-jump__link:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold);
}

/* ---------- 纵向刻度主线 ---------- */

.page-about .ledger {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: var(--about-gap);
  margin-top: 10px;
}

.page-about .stage {
  display: contents;
}

.page-about .stage__rail {
  position: relative;
}

.page-about .stage__rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--line);
}

.page-about .stage__dot {
  position: absolute;
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 75, 0.16);
  animation: about-pulse 2.4s ease-in-out infinite;
}

@media (min-width: 768px) {
  .page-about .stage__dot {
    width: 9px;
    height: 9px;
    top: 24px;
  }
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(201, 162, 75, 0.16); }
  50% { box-shadow: 0 0 0 6px rgba(201, 162, 75, 0.06); }
}

.page-about .stage__body {
  padding: 4px 0 54px;
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .stage__body {
    padding-bottom: 68px;
  }
}

/* ---------- 章节文字 ---------- */

.page-about .stage__index {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .stage__year {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(38px, 8vw, 68px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--gold-hi);
  margin: 0 0 10px;
}

@supports (-webkit-text-stroke: 1px currentColor) {
  .page-about .stage__year {
    color: transparent;
    -webkit-text-stroke: 1px var(--gold-hi);
  }
}

.page-about .stage__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(23px, 4.2vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about .stage__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 68ch;
  margin: 0 0 16px;
}

.page-about .stage__text--closing {
  color: var(--mist);
  padding-left: 16px;
  border-left: 1px solid var(--gold);
  margin-top: 22px;
}

.page-about .stage__figure {
  margin: 26px 0 0;
}

.page-about .stage__figure .media-frame {
  border: 1px solid var(--line);
}

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

.page-about .stage__figure-cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 三段子块 ---------- */

.page-about .trio {
  display: grid;
  gap: 20px;
  margin-top: 26px;
}

@media (min-width: 768px) {
  .page-about .trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

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

@media (min-width: 768px) {
  .page-about .trio__item {
    border-top-color: var(--line);
    padding-top: 16px;
  }
}

.page-about .trio__item h3 {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--paper);
  margin: 0 0 9px;
}

.page-about .trio__item p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

/* ---------- 深炭色板 ---------- */

.page-about .band {
  background: var(--panel);
  border-left: 2px solid var(--gold);
  padding: 26px 20px 28px;
}

@media (min-width: 768px) {
  .page-about .band {
    padding: 34px 32px 36px;
  }
}

@media (min-width: 1024px) {
  .page-about .band--offset {
    margin-left: -30px;
  }
}

.page-about .band .stage__text--closing {
  border-left-color: var(--cyan);
}

/* ---------- 团队环形图 ---------- */

.page-about .team-flex {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

@media (min-width: 768px) {
  .page-about .team-flex {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: center;
    gap: 34px;
  }
}

.page-about .team-ring {
  max-width: 240px;
  width: 100%;
}

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

.page-about .ring__base {
  fill: none;
  stroke: var(--line);
  stroke-width: 16;
}

.page-about .ring__seg {
  fill: none;
  stroke-width: 16;
  transform: rotate(-90deg);
  transform-origin: 90px 90px;
  transition: stroke-width 0.22s ease;
}

.page-about .ring__seg--a { stroke: var(--gold); }
.page-about .ring__seg--b { stroke: var(--cyan); }
.page-about .ring__seg--c { stroke: var(--silver); }
.page-about .ring__seg--d { stroke: var(--mist); }

.page-about .ring__seg:hover {
  stroke-width: 22;
}

.page-about .ring__num {
  font-family: var(--mono);
  font-size: 26px;
  fill: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .ring__cap {
  font-family: var(--mono);
  font-size: 9px;
  fill: var(--mist);
  letter-spacing: 0.18em;
}

.page-about .legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-about .legend__swatch {
  display: block;
  width: 10px;
  height: 10px;
  margin-top: 6px;
}

.page-about .legend__swatch--a { background: var(--gold); }
.page-about .legend__swatch--b { background: var(--cyan); }
.page-about .legend__swatch--c { background: var(--silver); }
.page-about .legend__swatch--d { background: var(--mist); }

.page-about .legend b {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
  line-height: 1.5;
}

.page-about .legend em {
  display: block;
  font-style: normal;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  margin-top: 4px;
}

/* ---------- 行业版图三段 ---------- */

.page-about .map-grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

@media (min-width: 900px) {
  .page-about .map-grid {
    grid-template-columns: 1.45fr 1.1fr 0.85fr;
    gap: 30px;
    align-items: start;
  }
}

.page-about .map-col {
  border-top: 2px solid var(--line);
  padding-top: 16px;
}

.page-about .map-col--mfg { border-top-color: var(--gold); }
.page-about .map-col--trade { border-top-color: var(--cyan); }
.page-about .map-col--pro { border-top-color: var(--mist); }

.page-about .map-col h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .map-col > p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
  margin: 0;
}

.page-about details {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
  transition: color 0.2s ease;
}

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

.page-about summary::after {
  content: " +";
}

.page-about details[open] summary::after {
  content: " –";
}

.page-about summary:hover,
.page-about summary:focus-visible {
  color: var(--gold-hi);
}

.page-about details ul {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about details li {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  padding-left: 14px;
  position: relative;
}

.page-about details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 生态面板 ---------- */

.page-about .eco-flex {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

@media (min-width: 900px) {
  .page-about .eco-flex {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
    gap: 32px;
  }
}

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

.page-about .eco-figure .media-frame {
  border: 1px solid var(--line);
}

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

/* ---------- 承诺清单 ---------- */

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

.page-about .pledge li {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 768px) {
  .page-about .pledge li {
    grid-template-columns: 90px minmax(0, 1fr);
    gap: 22px;
  }
}

.page-about .pledge b {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--gold);
  padding-top: 2px;
}

.page-about .pledge span {
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 下一步条 ---------- */

.page-about .next-step {
  margin-top: 8px;
  padding: 34px 0 64px;
  border-top: 1px solid var(--line);
}

.page-about .next-step__title {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
}

@media (min-width: 768px) {
  .page-about .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .next-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .next-list a {
  display: block;
  height: 100%;
  background: var(--ink);
  padding: 18px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  background: var(--panel-lift);
  color: var(--gold-hi);
}

.page-about .next-list__key {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 8px;
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .stage__dot {
    animation: none;
  }

  .page-about .ring__seg,
  .page-about .stage-jump__link,
  .page-about .next-list a,
  .page-about summary {
    transition: none;
  }
}
<<<END>>>