.page-about {
  --about-hair: rgba(35, 35, 35, .14);
  --about-hair-strong: rgba(35, 35, 35, .3);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 1.25rem 0 .5rem;
  font-size: .8125rem;
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: .4rem;
  color: var(--ink-mute);
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--grey);
}
.page-about .breadcrumbs a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(1rem, 3vw, 1.75rem) 0 clamp(2rem, 5vw, 4rem);
}
.page-about .about-hero__frame {
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--about-hair-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--sand);
  box-shadow: var(--shadow-micro);
}
.page-about .about-hero__rail {
  display: flex;
  background: var(--charcoal);
  color: rgba(252, 251, 247, .5);
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
}
.page-about .about-rail__tick {
  flex: 1 1 auto;
  padding: .55rem .5rem;
  text-align: center;
  border-right: 1px solid rgba(252, 251, 247, .14);
}
.page-about .about-rail__tick:last-child {
  border-right: 0;
}
.page-about .about-hero__body {
  padding: clamp(1.25rem, 4vw, 3rem);
}
.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.875rem, 5.4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: .5rem 0 1rem;
  max-width: 22ch;
}
.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0;
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 1.75rem 0 0;
  padding: 1px;
  list-style: none;
  background: var(--about-hair);
  border-radius: var(--radius);
}
.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .85rem 1rem;
  background: var(--snow);
}
.page-about .about-fact__num {
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  font-weight: 600;
  color: var(--orange);
  line-height: 1.1;
}
.page-about .about-fact__label {
  font-size: .8125rem;
  color: var(--ink-mute);
  line-height: 1.4;
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}
.page-about .about-section--sand {
  background: var(--sand);
}
.page-about .about-section--ink {
  background: var(--charcoal);
  color: var(--snow);
}

.page-about .about-split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}
.page-about .about-copy h2,
.page-about .about-head h2,
.page-about .about-response h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -.015em;
  margin: .5rem 0 1rem;
}
.page-about .about-copy p {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0 0 1rem;
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--about-hair-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--sand);
  box-shadow: var(--shadow-micro);
}
.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform .6s var(--ease);
}
.page-about .about-media:hover img {
  transform: scale(1.025);
}
.page-about .about-media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: .4rem .8rem;
  background: var(--charcoal);
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .05em;
}

/* ---------- 城市要点 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}
.page-about .about-points li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: .8rem;
  padding-bottom: .7rem;
  border-bottom: 1px dashed var(--about-hair);
  font-size: .9375rem;
  line-height: 1.65;
  color: var(--ink-soft);
}
.page-about .about-points__k {
  color: var(--orange-deep);
  font-weight: 600;
  letter-spacing: .04em;
}

/* ---------- 区块头 ---------- */
.page-about .about-head {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.page-about .about-head__lead {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ink-soft);
  max-width: 64ch;
  margin: 0;
}
.page-about .about-ladder {
  width: 100%;
  max-width: 320px;
  height: auto;
  justify-self: start;
}

/* ---------- 分级授权 ---------- */
.page-about .about-tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .about-tier {
  padding: 1.25rem;
  background: var(--snow);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.page-about .about-tier:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
  transform: translateY(-3px);
}
.page-about .about-tier__idx {
  display: inline-block;
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--green-deep);
  border-bottom: 2px solid var(--lime);
  padding-bottom: .15rem;
}
.page-about .about-tier h3 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.125rem;
  margin: .85rem 0 .5rem;
  letter-spacing: -.01em;
}
.page-about .about-tier p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 核定流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}
.page-about .about-steps li {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: .85rem;
  align-items: start;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
.page-about .about-steps .mono {
  color: var(--orange);
  font-weight: 600;
}

/* ---------- 响应承诺 ---------- */
.page-about .about-response {
  display: grid;
  gap: 2rem;
}
.page-about .about-section--ink .eyebrow {
  color: var(--lime);
}
.page-about .about-response h2 {
  color: var(--snow);
}
.page-about .about-response__text p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--on-dark);
  margin: 0 0 1rem;
}
.page-about .about-response__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--hairline-dark);
  border-radius: var(--radius);
}
.page-about .about-response__stats > div {
  background: var(--charcoal);
  padding: 1rem 1.1rem;
}
.page-about .about-response__stats dt {
  font-size: .75rem;
  letter-spacing: .08em;
  color: rgba(252, 251, 247, .5);
  margin-bottom: .35rem;
}
.page-about .about-response__stats dd {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--snow);
}
.page-about .about-response__stats dd.mono {
  color: var(--orange);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}
.page-about .about-node {
  display: grid;
  grid-template-columns: 1fr;
  gap: .6rem;
}
.page-about .about-node__stamp {
  display: flex;
  align-items: baseline;
  gap: .65rem;
}
.page-about .about-node__year {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .02em;
  transition: color .25s var(--ease);
}
.page-about .about-node__tag {
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--green-deep);
  background: rgba(168, 216, 46, .28);
  border-radius: 999px;
  padding: .15rem .6rem;
}
.page-about .about-node__panel {
  padding: 1.1rem 1.25rem;
  background: var(--snow);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--about-hair);
  border-radius: var(--radius);
  box-shadow: var(--shadow-micro);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.page-about .about-node__panel h3 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.0625rem;
  margin: 0 0 .45rem;
  letter-spacing: -.01em;
}
.page-about .about-node__panel p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}
.page-about .about-node:hover .about-node__year,
.page-about .about-node:focus-within .about-node__year {
  color: var(--orange);
}
.page-about .about-node:hover .about-node__panel,
.page-about .about-node:focus-within .about-node__panel {
  border-left-color: var(--orange);
  border-color: var(--about-hair-strong);
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.35rem;
  background: var(--snow);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.page-about .about-next__card:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
  transform: translateY(-3px);
}
.page-about .about-next__k {
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--ink-mute);
}
.page-about .about-next__card h3 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.125rem;
  margin: 0;
  letter-spacing: -.01em;
}
.page-about .about-next__card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
.page-about .about-next__go {
  margin-top: auto;
  padding-top: .5rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--orange-deep);
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color .2s var(--ease);
}
.page-about .about-next__card:hover .about-next__go {
  border-bottom-color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__frame {
    grid-template-columns: 4rem 1fr;
  }
  .page-about .about-hero__rail {
    flex-direction: column;
  }
  .page-about .about-rail__tick {
    border-right: 0;
    border-bottom: 1px solid rgba(252, 251, 247, .14);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .page-about .about-rail__tick:last-child {
    border-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 1.02fr .98fr;
  }
  .page-about .about-split--flip {
    grid-template-columns: .98fr 1.02fr;
  }
  .page-about .about-head {
    grid-template-columns: 1.45fr .55fr;
    align-items: end;
    gap: 2.5rem;
  }
  .page-about .about-head--stack {
    grid-template-columns: 1fr;
  }
  .page-about .about-ladder {
    justify-self: end;
  }
  .page-about .about-response {
    grid-template-columns: 1.4fr .6fr;
    align-items: start;
    gap: 3rem;
  }
  .page-about .about-node {
    grid-template-columns: 9rem 1fr;
    gap: 1.5rem;
    position: relative;
    align-items: start;
  }
  .page-about .about-node__stamp {
    flex-direction: column;
    align-items: flex-start;
    gap: .4rem;
    position: relative;
  }
  .page-about .about-node__stamp::after {
    content: "";
    position: absolute;
    top: .7rem;
    left: 100%;
    width: 1.5rem;
    height: 1px;
    background: var(--about-hair-strong);
  }
  .page-about .about-node + .about-node::before {
    content: "";
    position: absolute;
    left: calc(9rem + .75rem);
    top: -1.25rem;
    height: 1.25rem;
    width: 1px;
    background: var(--about-hair);
  }
  .page-about .about-node__panel {
    border-left-width: 1px;
    border-top: 3px solid var(--about-hair);
  }
  .page-about .about-node:hover .about-node__panel,
  .page-about .about-node:focus-within .about-node__panel {
    border-left-color: var(--about-hair-strong);
    border-top-color: var(--orange);
  }
}

@media (min-width: 1040px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-next {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }
  .page-about .about-response__stats {
    grid-template-columns: 1fr;
  }
}
<<<END>>>