.page-about {
  background: var(--paper);
  color: var(--ink);
  padding-bottom: clamp(2rem, 5vw, 4rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.5rem, 3.5vw, 2.5rem) clamp(2.25rem, 5vw, 4rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(242, 183, 5, .16), transparent 62%),
    radial-gradient(90% 80% at 4% 100%, rgba(47, 191, 155, .10), transparent 60%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(.85rem, 1.8vw, 1.35rem);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: .25rem;
}

.page-about .about-hero__eyebrow {
  color: var(--blue-800);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20em;
  font-size: clamp(2.3rem, 6.6vw, 5rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--blue-900);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 44em;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: .25rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .6rem;
}

.page-about .about-hero__facts li {
  padding: .42rem .95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  color: var(--blue-800);
  font-size: .84rem;
  line-height: 1.5;
}

/* ---------- 主体布局：主栏 + 右侧索引 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 3.5rem);
}

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 236px;
    align-items: start;
    padding-block: clamp(2.5rem, 5vw, 4.5rem);
  }
}

/* ---------- 右侧章节索引 ---------- */
.page-about .about-rail {
  order: -1;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  padding: .85rem .9rem;
}

.page-about .about-rail__title {
  margin: 0 0 .6rem;
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--gray);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .45rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  white-space: nowrap;
  padding: .38rem .75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--blue-800);
  font-size: .82rem;
  text-decoration: none;
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--gold-soft);
  color: var(--blue-900);
}

.page-about .about-rail__num {
  font-size: .72rem;
  color: var(--gold);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    order: 0;
    position: sticky;
    top: 5.5rem;
    border-radius: var(--radius-l);
    padding: 1.15rem 1rem 1.25rem;
    box-shadow: var(--shadow-1);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: .1rem;
    overflow: visible;
  }

  .page-about .about-rail__link {
    width: 100%;
    border: 0;
    border-radius: 8px;
    white-space: normal;
    padding: .5rem .6rem;
    justify-content: flex-start;
    font-size: .86rem;
  }

  .page-about .about-rail__num {
    color: var(--gray);
    font-size: .76rem;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.6rem);
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(.6rem, 1.4vw, 1rem);
  align-items: center;
}

.page-about .about-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  padding: .38rem .5rem;
  border-radius: 8px;
  background: var(--gold);
  color: var(--blue-900);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.45rem, 3.2vw, 2.25rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--blue-900);
}

.page-about .about-chapter__lede {
  margin: 0;
  max-width: 46em;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-chapter__note {
  margin: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--gold);
  max-width: 44em;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 分栏正文 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

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

.page-about .about-split__text p {
  margin: 0 0 1.1em;
  font-size: 1.02rem;
  line-height: 1.85;
}

.page-about .about-split__text p:last-of-type {
  margin-bottom: 0;
}

@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }
}

/* ---------- 服务地区 ---------- */
.page-about .about-regions {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-regions__item {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .7rem .85rem;
  background: var(--white);
  font-size: .94rem;
  color: var(--blue-900);
}

.page-about .about-regions__num {
  font-size: .72rem;
  color: var(--gold);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--sand);
  box-shadow: var(--shadow-1);
}

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

.page-about .about-figure--tall img {
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-figure--full img {
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.page-about .about-figure__caption {
  padding: .7rem .95rem;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--gray);
  background: var(--white);
  border-top: 1px solid var(--line);
}

.page-about .about-figure--full {
  margin-block: clamp(1.5rem, 3.5vw, 2.5rem);
}

/* ---------- 窄统计带 ---------- */
.page-about .about-band {
  position: relative;
  margin-block: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(1.35rem, 3vw, 2.1rem);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, var(--blue-800), var(--blue-900));
  color: var(--on-dark-strong);
  overflow: hidden;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -70%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 183, 5, .38), transparent 68%);
  pointer-events: none;
}

.page-about .about-band__kicker {
  position: relative;
  z-index: 1;
  margin: 0 0 1.1rem;
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-band__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.25rem;
}

.page-about .about-band__item {
  border-left: 2px solid rgba(242, 183, 5, .45);
  padding-left: .8rem;
}

.page-about .about-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--gold);
}

.page-about .about-band__label {
  display: block;
  margin-top: .45rem;
  font-size: .82rem;
  line-height: 1.55;
  color: var(--on-dark);
}

@media (min-width: 720px) {
  .page-about .about-band__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 两套文档 ---------- */
.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(.85rem, 2vw, 1.25rem);
}

@media (min-width: 720px) {
  .page-about .about-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-version {
  padding: 1.15rem 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue-800);
  border-radius: var(--radius);
  background: var(--white);
  transition: box-shadow 200ms var(--ease), transform 200ms var(--ease);
}

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

.page-about .about-version:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.page-about .about-version__tag {
  display: inline-block;
  margin: 0 0 .7rem;
  padding: .25rem .6rem;
  border-radius: 999px;
  background: var(--sand);
  color: var(--blue-800);
  font-size: .74rem;
  letter-spacing: .08em;
}

.page-about .about-version__title {
  margin: 0 0 .55rem;
  font-size: 1.16rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--blue-900);
}

.page-about .about-version__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 五个服务类别 ---------- */
.page-about .about-cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
}

@media (min-width: 760px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cats > .about-cat:first-child {
    grid-column: 1 / -1;
  }
}

.page-about .about-cat {
  position: relative;
  padding: 1.05rem 1.15rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.page-about .about-cat__num {
  display: inline-block;
  margin-bottom: .5rem;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-cat__title {
  margin: 0 0 .4rem;
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--blue-900);
}

.page-about .about-cat__desc {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 场景卡 ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .8rem;
}

@media (min-width: 700px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-scenes > .about-scene:first-child {
    grid-column: span 2;
  }
}

.page-about .about-scene {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.05rem 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  transition: border-color 160ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-scene:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-2);
}

.page-about .about-scene__meta {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--mint);
}

.page-about .about-scene__title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--blue-900);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 六个服务小组 ---------- */
.page-about .about-teams {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

@media (min-width: 980px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .95rem 1.05rem;
  background: var(--white);
}

.page-about .about-team__num {
  font-size: .76rem;
  color: var(--gold);
}

.page-about .about-team__name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--blue-900);
}

/* ---------- 协作网络 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .8rem;
}

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

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

.page-about .about-partner {
  padding: 1.05rem 1.05rem 1.15rem;
  border-radius: var(--radius);
  background: var(--sand);
}

.page-about .about-partner__title {
  margin: 0 0 .45rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--blue-800);
}

.page-about .about-partner__title::before {
  content: "";
  display: block;
  width: 22px;
  height: 3px;
  margin-bottom: .6rem;
  border-radius: 2px;
  background: var(--coral);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 五个环节 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(.8rem, 2vw, 1.5rem);
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-step__num {
  padding-top: .18rem;
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--blue-600);
}

.page-about .about-step__title {
  margin: 0 0 .35rem;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--blue-900);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 52em;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 三栏跳转 ---------- */
.page-about .about-jump {
  padding-block: clamp(2rem, 4.5vw, 3.25rem);
  border-top: 1px solid var(--line);
}

.page-about .about-jump__title {
  margin: 0 0 1.25rem;
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--blue-900);
}

.page-about .about-jump__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .8rem;
}

@media (min-width: 760px) {
  .page-about .about-jump__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-jump__card {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: 1.15rem 1.2rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: inherit;
  text-decoration: none;
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-jump__card:hover,
.page-about .about-jump__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: var(--shadow-2);
}

.page-about .about-jump__tag {
  align-self: flex-start;
  padding: .24rem .6rem;
  border-radius: 999px;
  background: var(--gold-soft);
  color: var(--blue-900);
  font-size: .72rem;
  letter-spacing: .08em;
}

.page-about .about-jump__name {
  font-size: .96rem;
  font-weight: 700;
  line-height: 1.7;
  color: var(--blue-800);
}

/* ---------- 底部联系条 ---------- */
.page-about .about-cta {
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  padding: clamp(1.5rem, 3.5vw, 2.5rem);
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, var(--blue-800), var(--blue-900));
  color: var(--on-dark-strong);
}

.page-about .about-cta__title {
  margin: 0 0 .7rem;
  font-size: clamp(1.35rem, 2.8vw, 1.95rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--on-dark-strong);
}

.page-about .about-cta__text {
  margin: 0 0 1.4rem;
  max-width: 46em;
  font-size: .97rem;
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .about-cta .btn--ghost {
  color: var(--on-dark-strong);
  border-color: rgba(250, 247, 241, .42);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  background: rgba(250, 247, 241, .12);
  border-color: var(--on-dark-strong);
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__title {
    max-width: 100%;
  }

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

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

  .page-about .about-band__item {
    border-left-width: 2px;
  }

  .page-about .about-cta__actions .btn {
    flex: 1 1 auto;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-scene,
  .page-about .about-jump__card {
    transition: none;
  }
  .page-about .about-version:hover,
  .page-about .about-jump__card:hover,
  .page-about .about-jump__card:focus-visible {
    transform: none;
  }
}