.page-about {
  --about-rail: 168px;
  --about-gap: clamp(28px, 4vw, 60px);
  --about-line: rgba(90, 107, 120, 0.3);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-block: clamp(16px, 3vw, 26px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3.4vw, 38px) clamp(38px, 6vw, 74px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -16%;
  bottom: -58%;
  width: min(62%, 540px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, rgba(47, 127, 118, 0.2), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(1.95rem, 5.2vw, 3.45rem);
  font-weight: 900;
  line-height: 1.13;
  letter-spacing: -0.022em;
  color: var(--ink-900);
  margin: 12px 0 0;
}

.page-about .about-hero__lead .lede {
  margin-top: clamp(16px, 2vw, 24px);
  max-width: 60ch;
  color: var(--ink-700);
}

/* 首屏数据块：深海蓝渐变 + 右上斜切 */
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
  padding: clamp(22px, 3vw, 34px);
  color: var(--paper-50);
  background:
    radial-gradient(120% 110% at 100% 0%, rgba(217, 161, 59, 0.24), transparent 62%),
    linear-gradient(152deg, var(--ink-700) 0%, var(--ink-900) 72%);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .hero-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.2vw, 2.3rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-400);
  margin: 0;
}

.page-about .hero-fact__unit {
  font-size: 0.42em;
  margin-left: 4px;
  letter-spacing: 0;
  color: var(--celadon-200);
}

.page-about .hero-fact__label {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--celadon-200);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-block: clamp(30px, 5vw, 62px) clamp(54px, 8vw, 106px);
}

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

/* ---------- 左侧章节索引 ---------- */
.page-about .about-index__label {
  display: none;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  border-bottom: 1px solid var(--about-line);
  scrollbar-width: thin;
}

.page-about .about-index__list > li {
  flex: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 5px 0;
  font-size: 14.5px;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-index__link:hover {
  color: var(--celadon-500);
  border-bottom-color: var(--gold-400);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--celadon-500);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 26px);
  }

  .page-about .about-index__label {
    display: block;
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--slate-500);
    margin: 0 0 12px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 2px solid var(--ink-900);
  }

  .page-about .about-index__link {
    width: 100%;
    align-items: center;
    padding: 8px 6px 8px 13px;
    margin-left: -2px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--gold-400);
    background: rgba(191, 220, 214, 0.38);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(44px, 6vw, 78px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 18px);
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-chapter__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 1.6vw, 1.1rem);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--celadon-500);
  padding-top: 3px;
}

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--ink-900);
  margin: 0;
}

.page-about .about-chapter:target .about-chapter__title {
  color: var(--celadon-500);
}

.page-about .about-chapter__body {
  color: var(--ink-700);
}

.page-about .about-chapter__body p {
  margin: 0 0 1.1em;
}

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

.page-about .about-chapter__body a {
  color: var(--celadon-500);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}

.page-about .about-chapter__body a:hover {
  color: var(--ink-900);
}

/* ---------- 三条服务线 ---------- */
.page-about .about-service + .about-service {
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px dashed rgba(90, 107, 120, 0.45);
}

.page-about .about-service h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .about-service h3::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--gold-400);
  transform: rotate(45deg);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  align-items: start;
}

@media (min-width: 780px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

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

.page-about .about-figure--wide {
  margin-top: clamp(24px, 3.4vw, 40px);
}

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

/* ---------- 地级市列表 ---------- */
.page-about .about-cities {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(104px, 1fr));
  gap: 9px 16px;
  font-size: 15px;
  color: var(--ink-700);
}

.page-about .about-cities li {
  position: relative;
  padding-left: 15px;
  line-height: 1.5;
}

.page-about .about-cities li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--celadon-500);
  transform: rotate(45deg);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin: clamp(22px, 3vw, 34px) 0 clamp(26px, 3.6vw, 42px);
}

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

.page-about .about-team__item {
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 3px solid var(--celadon-200);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-900);
}

.page-about .about-team__num span {
  font-size: 0.36em;
  margin-left: 5px;
  color: var(--celadon-500);
  letter-spacing: 0;
}

.page-about .about-team__name {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-500);
}

/* ---------- 稳定性条目 ---------- */
.page-about .about-rules {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-rule {
  display: grid;
  gap: 6px;
}

@media (min-width: 620px) {
  .page-about .about-rule {
    grid-template-columns: minmax(0, 168px) minmax(0, 1fr);
    gap: clamp(16px, 2.4vw, 30px);
    align-items: baseline;
  }
}

.page-about .about-rule dt {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--celadon-500);
}

.page-about .about-rule dd {
  margin: 0;
  color: var(--ink-700);
}

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  border-top: 2px solid var(--ink-900);
}

.page-about .about-stat {
  padding: clamp(18px, 2.6vw, 28px) clamp(12px, 1.8vw, 20px) clamp(16px, 2.2vw, 24px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-900);
}

.page-about .about-stat__unit {
  font-size: 0.4em;
  margin-left: 5px;
  letter-spacing: 0;
  color: var(--celadon-500);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 11px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate-500);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: clamp(26px, 4vw, 46px);
  background: var(--celadon-200);
  border-left: 6px solid var(--celadon-500);
  box-shadow: var(--shadow-hard);
}

.page-about .about-quote p {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4.2vw, 2.55rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .about-quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-700);
}

/* ---------- 合作与资质 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-partners li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-partners__n {
  flex: none;
  min-width: 46px;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .about-partners__t {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-700);
}

/* ---------- 相关入口 ---------- */
.page-about .about-next {
  display: grid;
  gap: 0;
  margin-top: clamp(30px, 4vw, 48px);
  border-top: 2px solid var(--ink-900);
}

.page-about .about-next__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(14px, 1.8vw, 18px) 0;
  border-bottom: 1px solid var(--about-line);
  text-decoration: none;
  transition: padding-left 160ms ease, background 160ms ease;
}

.page-about .about-next__item:hover {
  padding-left: 10px;
  background: rgba(191, 220, 214, 0.32);
}

.page-about .about-next__k {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--celadon-500);
}

.page-about .about-next__v {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-900);
}

@media (min-width: 760px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 52px);
  }
}

/* ---------- 常驻返回首页 ---------- */
.page-about .about-home-float {
  position: fixed;
  right: clamp(14px, 2vw, 24px);
  bottom: clamp(14px, 2vw, 24px);
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper-50);
  background: var(--ink-900);
  border: 2px solid var(--ink-900);
  text-decoration: none;
  box-shadow: var(--shadow-hard);
}

.page-about .about-home-float:hover {
  background: var(--celadon-500);
  border-color: var(--ink-900);
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-next__item,
  .page-about .about-home-float {
    transition: none;
  }
}
</style>