.page-about {
  --about-rail-w: 190px;
  --about-shadow: 6px 6px 0 rgba(216, 205, 187, 0.5);
  background: var(--paper);
  color: var(--ink);
}

.page-about .breadcrumb {
  padding: 1.25rem 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background: linear-gradient(116deg, var(--paper) 0 60%, rgba(226, 112, 58, 0.13) 60% 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(36%, 380px);
  height: 6px;
  background: var(--dusk);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 5.2rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__copy .lede {
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  background: var(--deep);
  clip-path: polygon(4% 0, 100% 6%, 96% 100%, 0 94%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  opacity: 0.94;
}

.page-about .about-hero__figure .media-frame__caption {
  position: absolute;
  left: 1.1rem;
  bottom: 1.1rem;
  padding: 0.35rem 0.7rem;
  background: var(--paper-soft);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.6rem;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 1rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-about .about-facts__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}

.page-about .about-rail__list {
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__list a {
  display: flex;
  gap: 0.5rem;
  padding: 0.45rem 0;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a.is-active {
  color: var(--ink);
  border-bottom-color: var(--dusk);
}

.page-about .about-rail__num {
  color: var(--dusk);
  font-weight: 700;
  letter-spacing: 0.06em;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(1.75rem, 4vw, 2.75rem) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-section__head {
  max-width: 42rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-section .section-title {
  margin: 0.5rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-section__head .lede {
  max-width: 34em;
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-audience__item {
  position: relative;
  padding: 1.1rem 1.25rem 1.15rem 3.25rem;
  background: var(--paper-soft);
  border-left: 3px solid var(--glacier);
  box-shadow: var(--about-shadow);
}

.page-about .about-audience__item:nth-child(even) {
  border-left-color: var(--dusk);
}

.page-about .about-audience__num {
  position: absolute;
  left: 1.1rem;
  top: 1.1rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1;
  color: var(--dusk);
}

.page-about .about-audience__item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 两条通道 ---------- */
.page-about .about-channels {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-channel {
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  background: var(--paper-soft);
}

.page-about .about-channel--desk {
  background: linear-gradient(160deg, var(--paper-soft) 0 68%, rgba(116, 198, 190, 0.2) 100%);
}

.page-about .about-channel--mobile {
  background: linear-gradient(200deg, var(--paper-soft) 0 68%, rgba(242, 193, 78, 0.24) 100%);
}

.page-about .about-channel h3 {
  margin: 0.65rem 0 0.55rem;
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.25;
}

.page-about .about-channel p {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-channel ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-channel li + li {
  margin-top: 0.25rem;
}

/* ---------- 版本演进 ---------- */
.page-about .about-filter {
  margin-bottom: 1.25rem;
}

.page-about .about-timeline {
  display: grid;
  gap: 0;
}

.page-about .about-node {
  display: grid;
  gap: 0.5rem 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.page-about .about-node[hidden] {
  display: none;
}

.page-about .about-node__mark {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.page-about .about-node__mark .num {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1;
  color: var(--dusk);
}

.page-about .about-node:nth-child(2) .num {
  font-size: 2.15rem;
}

.page-about .about-node:nth-child(3) .num {
  font-size: 2.4rem;
}

.page-about .about-node:nth-child(4) .num {
  font-size: 2.7rem;
}

.page-about .about-node__era {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .about-node__body h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 34em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-figure {
  margin: 1.5rem 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-figure .media-frame__caption {
  display: block;
  margin-top: 0.6rem;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- 内容分类矩阵 ---------- */
.page-about .about-matrix {
  display: grid;
  gap: 1rem;
}

.page-about .about-cat {
  padding: 1.1rem 1.1rem 1.25rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-cat:hover,
.page-about .about-cat:focus-within {
  transform: translateY(-4px);
  border-color: var(--dusk);
}

.page-about .about-cat:nth-child(3n + 2) {
  background: rgba(116, 198, 190, 0.15);
}

.page-about .about-cat:nth-child(3n) {
  background: rgba(242, 193, 78, 0.18);
}

.page-about .about-cat__num {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dusk);
}

.page-about .about-cat h3 {
  margin: 0.5rem 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .about-cat p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-cat__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.8rem;
}

.page-about .about-figure--matrix {
  margin-top: 1.5rem;
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .about-reach {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-reach__deco {
  position: absolute;
  right: -8%;
  bottom: -38%;
  width: min(70%, 520px);
  height: 70%;
  background-image: radial-gradient(var(--glacier) 1.5px, transparent 1.6px);
  background-size: 26px 26px;
  opacity: 0.3;
  pointer-events: none;
}

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

.page-about .about-reach .index-label,
.page-about .about-reach .section-title {
  color: var(--paper-soft);
}

.page-about .about-reach .lede {
  color: rgba(245, 237, 225, 0.82);
  max-width: 38em;
}

.page-about .about-reach__stats {
  display: grid;
  gap: 1rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding-top: 0.75rem;
  border-top: 1px solid rgba(245, 237, 225, 0.25);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1;
  color: var(--dusk);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: rgba(245, 237, 225, 0.8);
}

.page-about .about-reach__note {
  position: relative;
  max-width: 40em;
  margin: 1.75rem 0 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(245, 237, 225, 0.84);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1rem;
}

.page-about .about-partner {
  padding: 1.1rem 1.15rem 1.25rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--glacier);
}

.page-about .about-partner:nth-child(2) {
  border-top-color: var(--dusk);
}

.page-about .about-partner:nth-child(3) {
  border-top-color: var(--print);
}

.page-about .about-partner h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-partners__note {
  max-width: 38em;
  margin: 1.25rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-partners__link {
  margin: 1.25rem 0 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
  padding-top: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-next__links {
  display: grid;
  gap: 0.6rem;
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__links a {
  display: block;
  padding: 0.7rem 0.9rem;
  background: var(--paper-soft);
  border-left: 3px solid var(--glacier);
  font-size: 0.92rem;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next__links a:hover {
  border-left-color: var(--dusk);
  transform: translateX(3px);
}

.page-about .about-contact {
  margin-top: 1.75rem;
  padding: 1.25rem;
  background: var(--paper-soft);
  border: 1px solid var(--line);
}

.page-about .about-contact__line {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-contact__note {
  margin: 0.6rem 0 1rem;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

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

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

@media (min-width: 760px) {
  .page-about .about-channels {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .page-about .about-channel--mobile {
    margin-top: 2.5rem;
  }

  .page-about .about-node {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-audience__item:nth-child(even) {
    margin-left: clamp(0rem, 3vw, 2.5rem);
  }
}

@media (min-width: 1060px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cat,
  .page-about .about-next__links a {
    transition: none;
  }

  .page-about .about-cat:hover,
  .page-about .about-cat:focus-within {
    transform: none;
  }

  .page-about .about-next__links a:hover {
    transform: none;
  }
}
<<<END>>>