.page-about {
  background: var(--c-ink);
  color: var(--c-paper);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  padding-top: clamp(18px, 2.8vw, 30px);
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

/* ---------- 封面首屏 ---------- */
.page-about .about-cover {
  position: relative;
  padding: clamp(20px, 3.4vw, 36px) 0 clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line-mid);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 124px;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--c-scale) 0 1px, transparent 1px 8px);
  opacity: 0.6;
}

.page-about .about-cover .eyebrow {
  color: var(--c-cyan);
  letter-spacing: 0.08em;
}

.page-about .about-cover h1 {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(27px, 5.6vw, 44px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  margin: clamp(12px, 2vw, 18px) 0 0;
  max-width: 24ch;
  color: var(--c-paper);
}

.page-about .about-lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 64ch;
  font-size: clamp(14.5px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .cover-facts {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .cover-facts li {
  background: var(--c-ink);
  padding: 14px clamp(12px, 2vw, 18px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .fact-code {
  font-size: clamp(16px, 2.2vw, 20px);
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-scale);
}

/* ---------- 左右分屏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 54px);
  padding-top: clamp(32px, 5.4vw, 68px);
}

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

.page-about .about-main {
  min-width: 0;
  display: grid;
  gap: clamp(44px, 6vw, 80px);
}

/* ---------- 左栏：阶段刻度 ---------- */
.page-about .rail-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-scale);
}

.page-about .stage-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-mid);
}

.page-about .stage-rail li {
  position: relative;
  min-width: 0;
}

.page-about .stage-rail a {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 11px 0 11px 18px;
  text-decoration: none;
  color: var(--c-silver);
}

.page-about .stage-rail a::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 17px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--c-scale);
  background: var(--c-ink);
  border-radius: 50%;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .stage-rail a:hover {
  color: var(--c-paper);
}

.page-about .stage-rail a.is-active {
  color: var(--c-cyan);
}

.page-about .stage-rail a.is-active::before {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .rail-code {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: inherit;
}

.page-about .rail-name {
  font-family: var(--font-head);
  font-size: 14.5px;
  line-height: 1.45;
  color: inherit;
}

.page-about .rail-metric {
  margin-top: clamp(22px, 3vw, 30px);
  padding: 16px 16px 18px;
  border: 1px solid var(--line-mid);
  border-left: 3px solid var(--c-cyan);
  background: var(--c-graphite);
}

.page-about .rail-metric-value {
  display: block;
  font-size: clamp(30px, 4vw, 38px);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: 0.02em;
}

.page-about .rail-metric-unit {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-silver);
}

.page-about .rail-metric-note {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-scale);
}

/* ---------- 右栏：分区通用 ---------- */
.page-about .about-section {
  min-width: 0;
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section .eyebrow {
  color: var(--c-cyan);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-section .section-note {
  max-width: 62ch;
}

.page-about .prose p,
.page-about .stage-item p,
.page-about .qual-split p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .prose p:last-child,
.page-about .stage-item p:last-child,
.page-about .qual-split p:last-child {
  margin-bottom: 0;
}

.page-about .prose a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

.page-about .prose a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 更新节奏 ---------- */
.page-about .update-grid {
  margin-top: clamp(18px, 2.8vw, 28px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .update-item {
  background: var(--c-graphite);
  padding: 16px 18px;
  min-width: 0;
}

.page-about .update-cycle {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .update-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-silver);
}

/* ---------- 发展阶段 ---------- */
.page-about .stage-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .stage-item {
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line-soft);
  min-width: 0;
}

.page-about .stage-name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .stage-result {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--c-scale);
}

/* ---------- 产能核定 ---------- */
.page-about .caliber-quote {
  margin: clamp(18px, 2.8vw, 28px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.4vw, 24px);
  background: var(--c-graphite);
  border: 1px solid var(--line-mid);
  border-left: 3px solid var(--c-cyan);
}

.page-about .caliber-quote p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-paper);
}

.page-about .caliber-quote cite {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-scale);
}

.page-about .cap-figs {
  margin-top: clamp(18px, 2.8vw, 28px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

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

.page-about .figure-frame {
  overflow: hidden;
  border: 1px solid var(--line-mid);
  background: var(--c-graphite);
}

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

.page-about .figure-caption {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--c-scale);
}

.page-about .line-bar {
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .line-bar-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-silver);
}

.page-about .line-bar svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .line-legend {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  font-size: 13px;
  color: var(--c-silver);
}

.page-about .line-legend .mono {
  color: var(--c-paper);
}

.page-about .dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 8px;
  vertical-align: middle;
}

.page-about .dot--silver {
  background: var(--c-silver);
}

.page-about .dot--cyan {
  background: var(--c-cyan);
}

/* ---------- 招商配额 ---------- */
.page-about .quota-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .quota-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 16px 20px;
  background: var(--c-graphite);
  border: 1px solid var(--line-mid);
  min-width: 0;
}

.page-about .quota-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-violet-a), var(--c-violet-b));
}

.page-about .quota-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.5;
  color: var(--c-paper);
}

.page-about .quota-num {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.page-about .quota-num span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-scale);
}

.page-about .quota-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .quota-total {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  padding: 13px 16px;
  background: var(--c-space);
  border-left: 3px solid var(--c-cyan);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .quota-total .mono {
  color: var(--c-paper);
}

.page-about .quota-grid + .quota-total + .prose {
  margin-top: clamp(16px, 2.4vw, 22px);
}

/* ---------- 资质与检测 ---------- */
.page-about .qual-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-about .qual-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .qual-list li {
  position: relative;
  padding: 11px 0 11px 22px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-paper);
}

.page-about .qual-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 1px;
  background: var(--c-cyan);
}

/* ---------- 相关口径 ---------- */
.page-about .more-links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .more-links a {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  color: inherit;
}

.page-about .more-code {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .more-name {
  font-family: var(--font-head);
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--c-paper);
  transition: color 0.2s var(--ease);
}

.page-about .more-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-scale);
}

.page-about .more-links a:hover .more-name,
.page-about .more-links a:focus-visible .more-name {
  color: var(--c-cyan);
}

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

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

@media (min-width: 760px) {
  .page-about .cover-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .more-links a {
    grid-template-columns: 72px minmax(0, 170px) minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 18px;
  }

  .page-about .more-desc {
    padding-top: 0;
  }
}

@media (min-width: 860px) {
  .page-about .qual-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .cap-figs {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-split {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 78px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 28px;
  }

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

  .page-about .stage-item {
    padding-right: 12px;
  }
}

@media (max-width: 999px) {
  .page-about .stage-rail ol {
    display: flex;
    gap: 22px;
    overflow-x: auto;
    border-left: 0;
    border-top: 1px solid var(--line-mid);
    padding: 12px 0 2px;
    scrollbar-width: thin;
  }

  .page-about .stage-rail li {
    flex: 0 0 auto;
  }

  .page-about .stage-rail a {
    padding: 6px 0;
    gap: 2px;
  }

  .page-about .stage-rail a::before {
    display: none;
  }

  .page-about .rail-metric {
    margin-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-rail a::before,
  .page-about .more-name {
    transition: none;
  }
}