.page-about {
  --about-rail-w: 188px;
  padding-top: 6px;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 3.5vw, 48px) clamp(28px, 4vw, 52px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(20px, 3.5vw, 40px);
}

.page-about h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(32px, 5.6vw, 66px);
  color: var(--snow);
  margin: 0.42em 0 0.5em;
  text-wrap: balance;
}

.page-about .about-hero__lead .eyebrow {
  color: var(--cyan);
  letter-spacing: 0.16em;
  font-size: 11.5px;
  margin: 0;
}

.page-about .about-hero__lead .lede {
  max-width: 36rem;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--snow);
  opacity: 0.86;
  margin: 0;
}

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

.page-about .about-facts li {
  padding: 14px 12px 13px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__num {
  display: block;
  font-size: 21px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-facts__label {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  color: var(--dust);
}

/* ---------- 横幅 ---------- */
.page-about .about-banner {
  position: relative;
  margin: clamp(24px, 4vw, 44px) 0 0;
  overflow: hidden;
  background: var(--rock);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

.page-about .about-banner__cap {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 5px 10px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--snow);
  background: rgba(6, 20, 38, 0.74);
}

/* ---------- 主布局与刻度栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  padding-block: clamp(34px, 6vw, 84px);
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--dust);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0 6px;
}

.page-about .about-rail__list li {
  flex: 1 1 150px;
}

.page-about .about-rail__list a {
  display: block;
  position: relative;
  padding: 9px 0 9px 18px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--dust);
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.page-about .about-rail__list a::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 13px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--snow);
}

.page-about .about-rail__list a:hover::before,
.page-about .about-rail__list a:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(24, 224, 200, 0.14);
}

.page-about .about-rail__year {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(28px, 4.5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-body > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .about-chapter__head .section__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.8vw, 42px);
  line-height: 1;
  color: var(--cyan);
  opacity: 0.8;
}

.page-about .about-chapter__head .section__title {
  margin: 0;
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .prose p {
  max-width: 40rem;
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--snow);
  opacity: 0.86;
}

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

.page-about .prose a {
  color: var(--lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 生产流程 ---------- */
.page-about .split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 36px);
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.page-about .steps li {
  position: relative;
  margin-left: 13px;
  padding: 0 0 22px 34px;
  border-left: 1px solid var(--line);
}

.page-about .steps li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: -13px;
  top: 0;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--rock);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-about .steps h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--snow);
  line-height: 1.4;
}

.page-about .steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--dust);
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  background: var(--rock);
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-about .about-figure__cap {
  display: block;
  padding: 10px 12px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--dust);
  border-top: 1px solid var(--line);
}

/* ---------- 数字带 ---------- */
.page-about .about-chapter--band .stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-card {
  background: var(--rock);
  padding: 20px 18px 22px;
  outline-offset: -3px;
  transition: background 0.24s var(--ease);
}

.page-about .stat-card:hover,
.page-about .stat-card:focus-within {
  background: var(--night-2);
}

.page-about .stat-card__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--dust);
}

.page-about .stat-card__value {
  margin: 10px 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.4vw, 50px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .stat-card__small {
  font-size: 0.5em;
  letter-spacing: 0.02em;
  margin-left: 2px;
}

.page-about .stat-card__unit {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--snow);
  opacity: 0.82;
}

.page-about .stat-card__note {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dust);
  transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease),
    margin-top 0.28s var(--ease);
}

.page-about .stat-card:hover .stat-card__note,
.page-about .stat-card:focus-within .stat-card__note {
  max-height: 6.5em;
  opacity: 1;
  margin-top: 12px;
}

.page-about .mini-stats {
  list-style: none;
  margin: 1px 0 0;
  padding: 15px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  border: 1px solid var(--line);
  border-top: 0;
  background: var(--night-2);
  font-size: 13.5px;
  color: var(--dust);
}

.page-about .mini-stats strong {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--gold);
  margin-right: 4px;
}

/* ---------- 时间线 ---------- */
.page-about .timeline-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .timeline__item:first-child {
  padding-top: 0;
}

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

.page-about .timeline__year {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--flag);
}

.page-about .timeline__year::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--flag);
}

.page-about .timeline__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--snow);
  line-height: 1.4;
}

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

/* ---------- 伙伴 ---------- */
.page-about .partner-grid {
  margin-top: clamp(18px, 2.6vw, 26px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-card {
  background: var(--night-2);
  padding: 22px 20px;
}

.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1.4;
}

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

.page-about .partner-card a {
  color: var(--lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .partner-card a:hover {
  color: var(--cyan);
}

/* ---------- 折叠面板 ---------- */
.page-about .panel {
  background: var(--rock);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.page-about .panel summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--snow);
  line-height: 1.5;
}

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

.page-about .panel summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  transition: transform 0.26s var(--ease);
}

.page-about .panel[open] summary::after {
  content: "−";
}

.page-about .panel summary:hover {
  color: var(--cyan);
}

.page-about .panel__body {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--dust);
}

.page-about .panel__body p {
  max-width: 38rem;
  margin: 0 0 0.8em;
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: clamp(36px, 5.5vw, 72px);
  padding: clamp(22px, 3.6vw, 38px);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(24, 224, 200, 0.09), rgba(242, 101, 42, 0.09));
}

.page-about .about-next .slant-box {
  display: inline-block;
  padding: 4px 14px 4px 10px;
  background: var(--flag);
  color: #0b1a2a;
  font-size: 11px;
  letter-spacing: 0.18em;
  clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-next h2 {
  margin: 16px 0 0;
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .next-links {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .next-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 18px;
  background: var(--night);
  color: var(--snow);
  text-decoration: none;
  font-size: 15px;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .next-links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  background: var(--rock);
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-chapter--band .stat-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .timeline__item {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .timeline-wrap {
    grid-template-columns: 230px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
  }

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

  .page-about .about-rail__list li {
    flex: initial;
  }

  .page-about .about-rail__list a {
    padding: 10px 0 10px 18px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-chapter--band .stat-strip {
    grid-template-columns: 1.15fr 0.85fr 1fr 0.9fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>