.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: 0;
}

.page-about .about-section {
  padding: clamp(40px, 6vw, 84px) 0;
}

.page-about .placard {
  margin: 0 0 10px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.24;
  color: var(--ink-deep);
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 40px) 0 clamp(36px, 5vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.14;
  color: var(--ink-deep);
  margin: 0 0 18px;
}

.page-about .about-hero__lede {
  font-size: 16.5px;
  line-height: 1.8;
  max-width: 34em;
  margin: 0 0 14px;
}

.page-about .about-hero__note {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(58, 62, 66, 0.82);
  max-width: 34em;
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--brick);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts__item {
  background: var(--paper-card);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-facts__label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(58, 62, 66, 0.7);
  margin: 0;
}

.page-about .about-facts__num {
  font-size: 22px;
  line-height: 1.1;
  font-weight: 700;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-deep);
  position: relative;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 7 / 5;
}

.page-about .about-hero__cap {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-size: 12.5px;
  color: rgba(251, 248, 243, 0.86);
  background: rgba(18, 49, 42, 0.82);
  padding: 10px 14px;
  line-height: 1.6;
}

/* ---------- 问题 ---------- */
.page-about .about-problems__title {
  margin-bottom: 14px;
}

.page-about .about-problems__lede {
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(58, 62, 66, 0.86);
  margin: 0;
}

.page-about .about-issues {
  margin-top: clamp(22px, 3vw, 38px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-issue {
  display: grid;
  gap: 12px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-issue__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  margin: 0;
  letter-spacing: 0.04em;
}

.page-about .about-issue__title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-deep);
  margin: 0 0 8px;
}

.page-about .about-issue__body p,
.page-about .about-issue__fix p {
  font-size: 15.5px;
  line-height: 1.8;
  margin: 0;
}

.page-about .about-issue__fix {
  border-left: 2px solid var(--cyan);
  padding-left: 14px;
}

.page-about .about-issue__fix .tag {
  display: inline-block;
  margin-bottom: 8px;
}

/* ---------- 时间线 ---------- */
.page-about .about-evolution {
  background: linear-gradient(180deg, rgba(251, 248, 243, 0) 0%, rgba(251, 248, 243, 0.9) 22%, rgba(251, 248, 243, 0.9) 78%, rgba(251, 248, 243, 0) 100%);
}

.page-about .about-timeline {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-years {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-years__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  text-decoration: none;
  color: var(--ink);
  font-size: 13.5px;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: var(--paper-card);
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease), color 240ms var(--ease);
}

.page-about .about-years__year {
  font-size: 12.5px;
  color: var(--cyan);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  border-color: var(--brick);
  background: var(--amber-soft);
  color: var(--ink-deep);
}

.page-about .about-stage {
  position: relative;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brick);
  padding: clamp(20px, 3vw, 30px) clamp(18px, 3vw, 32px);
  margin-bottom: clamp(14px, 2vw, 20px);
  scroll-margin-top: 104px;
}

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

.page-about .about-stage__code {
  position: absolute;
  top: 14px;
  right: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid var(--cyan-soft);
  padding: 2px 8px;
  border-radius: var(--radius);
}

.page-about .about-stage__kicker {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 13px;
  color: var(--brick);
  margin: 0 0 10px;
  padding-right: 64px;
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.5;
  color: var(--ink-deep);
  margin: 0 0 10px;
  padding-right: 56px;
}

.page-about .about-stage__lede {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-about .about-stage__text {
  font-size: 15.5px;
  line-height: 1.85;
  margin: 0 0 14px;
}

.page-about .about-stage__data {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--cyan);
  border-top: 1px dashed var(--line-strong);
  padding-top: 10px;
  margin: 0;
}

/* ---------- 内容生产 ---------- */
.page-about .about-craft {
  background: var(--ink-deep);
  color: rgba(251, 248, 243, 0.9);
  padding: clamp(40px, 6vw, 84px) 0;
}

.page-about .about-craft__title {
  color: var(--paper-card);
  margin-bottom: 4px;
}

.page-about .about-craft .placard {
  color: var(--cyan-soft);
}

.page-about .about-craft__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 3vw, 38px);
}

.page-about .about-craft__figure {
  margin: 0 0 18px;
  border: 1px solid var(--line-light);
}

.page-about .about-craft__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-craft__cap {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(251, 248, 243, 0.72);
  padding: 10px 14px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-roles {
  display: grid;
  gap: 1px;
  background: rgba(251, 248, 243, 0.14);
  border: 1px solid rgba(251, 248, 243, 0.14);
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--ink-deep-2);
}

.page-about .about-roles__num {
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan-soft);
  line-height: 1.2;
}

.page-about .about-roles__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(251, 248, 243, 0.86);
}

.page-about .about-craft__sub {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.5;
  color: var(--paper-card);
  margin: 0 0 10px;
}

.page-about .about-craft__text {
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(251, 248, 243, 0.84);
  margin: 0 0 18px;
}

.page-about .about-flow {
  margin: 0 0 16px;
}

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

.page-about .about-flow svg text {
  font-family: var(--font-body);
  font-size: 14px;
  fill: rgba(251, 248, 243, 0.86);
}

.page-about .about-flow svg .about-flow__lane {
  stroke: rgba(127, 198, 201, 0.55);
  stroke-width: 2;
  stroke-dasharray: 6 6;
}

.page-about .about-flow svg .about-flow__gate {
  fill: rgba(232, 121, 26, 0.14);
  stroke: var(--amber);
  stroke-width: 2;
}

.page-about .about-flow svg .about-flow__gate-text {
  fill: var(--amber);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  text-anchor: middle;
}

.page-about .about-review {
  border: 1px solid rgba(251, 248, 243, 0.2);
  background: rgba(251, 248, 243, 0.06);
}

.page-about .about-review__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  padding: 13px 16px;
  font-weight: 700;
  font-size: 15px;
  color: var(--paper-card);
  list-style: none;
}

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

.page-about .about-review__summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 15px;
}

.page-about .about-review[open] .about-review__summary::after {
  content: "－";
}

.page-about .about-review__body {
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(251, 248, 243, 0.82);
}

.page-about .about-review__body ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-review__body li {
  margin-bottom: 8px;
}

.page-about .about-review__body li:last-child {
  margin-bottom: 0;
}

.page-about .about-review__body strong {
  color: var(--cyan-soft);
  font-weight: 700;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__head {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
}

.page-about .about-coverage__lede {
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(58, 62, 66, 0.86);
  margin: 14px 0 0;
}

.page-about .about-coverage__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--paper-card);
}

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  opacity: 0.9;
}

.page-about .about-coverage__cap {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(58, 62, 66, 0.76);
  padding: 10px 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-cities {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-city {
  background: var(--paper-card);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 84px;
  justify-content: center;
  transition: background-color 240ms var(--ease);
}

.page-about .about-city:hover,
.page-about .about-city:focus-within {
  background: var(--amber-soft);
}

.page-about .about-city__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink-deep);
  line-height: 1.2;
}

.page-about .about-city__meta {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-coverage__data {
  display: grid;
  gap: 1px;
  margin-top: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: none;
}

.page-about .about-coverage__datum {
  background: rgba(251, 248, 243, 0.7);
  padding: 16px;
}

.page-about .about-coverage__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  margin: 0 0 6px;
  letter-spacing: 0.02em;
}

.page-about .about-coverage__label {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(58, 62, 66, 0.84);
  margin: 0;
}

.page-about .about-coverage__foot {
  margin: 18px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(58, 62, 66, 0.8);
  padding-left: 14px;
  border-left: 2px solid var(--brick);
}

/* ---------- 长期做法 ---------- */
.page-about .about-rules {
  background: var(--amber-soft);
  padding: clamp(40px, 5vw, 76px) 0;
}

.page-about .about-rules .section-title {
  color: var(--ink-deep);
}

.page-about .about-rules__list {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: rgba(58, 62, 66, 0.16);
  border: 1px solid rgba(58, 62, 66, 0.16);
}

.page-about .about-rules__item {
  background: var(--paper-card);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .about-rules__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--brick);
  margin: 0 0 8px;
}

.page-about .about-rules__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink-deep);
  margin: 0 0 8px;
}

.page-about .about-rules__item p:last-child {
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  color: rgba(58, 62, 66, 0.88);
}

.page-about .about-next {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid rgba(58, 62, 66, 0.2);
}

.page-about .about-next__lead {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-size: 13.5px;
  color: rgba(58, 62, 66, 0.8);
  margin: 0 0 14px;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-next__link {
  display: inline-block;
  padding: 9px 16px;
  font-size: 14px;
  text-decoration: none;
  color: var(--ink-deep);
  background: var(--paper-card);
  border: 1px solid rgba(58, 62, 66, 0.28);
  border-radius: var(--radius);
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease), color 240ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--glass-strong);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-issue {
    grid-template-columns: 52px minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    align-items: start;
  }

  .page-about .about-issue__num {
    font-size: 22px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: end;
  }

  .page-about .about-craft__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .about-coverage__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    gap: clamp(28px, 4vw, 52px);
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-years {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .about-years__link {
    border: none;
    border-left: 2px solid transparent;
    background: transparent;
    margin-left: -1px;
    padding: 9px 12px;
  }

  .page-about .about-years__link:hover,
  .page-about .about-years__link:focus-visible {
    background: var(--glass);
    border-left-color: var(--brick);
    color: var(--ink-deep);
  }
}

@media (min-width: 1024px) {
  .page-about .about-cities {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-city,
  .page-about .about-years__link,
  .page-about .about-next__link {
    transition: none;
  }
}
<<<END>>>