.page-about {
  --about-cut: 16px;
  --about-rail: 210px;
  background: var(--c-paper);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 26px;
  font-size: 13px;
  color: var(--c-slate);
}
.page-about .crumbs a {
  color: var(--c-navy-mid);
  text-decoration: none;
}
.page-about .crumbs a:hover {
  color: var(--c-orange-deep);
}
.page-about .crumbs__sep {
  margin: 0 8px;
  color: var(--c-line-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding-top: 26px;
  padding-bottom: 64px;
}
.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-orange-deep);
}
.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-navy);
}
.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-navy-mid);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__stats li {
  border-left: 3px solid var(--c-orange);
  padding-left: 12px;
  min-width: 0;
}
.page-about .about-hero__num {
  display: block;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-navy);
}
.page-about .about-hero__num em {
  font-style: normal;
  font-size: 14px;
  margin-left: 2px;
  color: var(--c-orange-deep);
}
.page-about .about-hero__stats li span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--c-slate);
}
.page-about .about-hero__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.page-about .about-hero__fig {
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-orange-mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  overflow: hidden;
}
.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 正文容器 ---------- */
.page-about .about-body {
  padding-bottom: 24px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  position: relative;
  padding: 44px 0 52px;
  border-top: 1px solid var(--c-line);
}
.page-about .about-sec--last {
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-sec__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}
.page-about .about-sec__num {
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-line-soft);
  transition: color var(--t-base);
}
.page-about .sec-num.is-active {
  color: var(--c-orange);
}
.page-about .about-sec__kicker {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-slate);
}
.page-about .about-sec__body > h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--c-navy);
}
.page-about .about-sec__intro {
  margin: 0 0 30px;
  max-width: 720px;
  line-height: 1.8;
  color: var(--c-navy-mid);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  margin: 0;
  padding: 4px 0 0 28px;
  list-style: none;
  position: relative;
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 26px;
  width: 3px;
  border-radius: 3px;
  background: var(--grad-track);
}
.page-about .about-tl__item {
  position: relative;
  padding-bottom: 28px;
}
.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--c-white);
  border: 3px solid var(--c-orange);
  box-sizing: border-box;
}
.page-about .about-tl__year {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-orange-deep);
  background: var(--c-orange-mist);
  padding: 2px 10px;
  border-radius: var(--r-pill);
}
.page-about .about-tl__title {
  margin: 10px 0 6px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-navy);
}
.page-about .about-tl__item p {
  margin: 0;
  max-width: 660px;
  line-height: 1.8;
  color: var(--c-navy-mid);
}

/* ---------- 团队三卡 ---------- */
.page-about .about-team {
  display: grid;
  gap: 18px;
}
.page-about .about-team__card {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  padding: 22px 22px 20px;
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--about-cut));
  transition: border-color var(--t-base);
}
.page-about .about-team__card:hover {
  border-color: var(--c-orange);
}
.page-about .about-team__avatar {
  display: block;
  margin-bottom: 14px;
}
.page-about .about-team__card h3 {
  margin: 12px 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-navy);
}
.page-about .about-team__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-navy-mid);
}

/* ---------- 排班说明条 ---------- */
.page-about .about-shift {
  margin-top: 24px;
  padding: 20px 22px;
  background: var(--c-navy);
  color: var(--c-orange-mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}
.page-about .about-shift__main {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
}
.page-about .about-shift__sub {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-orange-lift);
}

/* ---------- 流程 ---------- */
.page-about .about-flow__fig {
  margin: 0 0 28px;
  border: 1px solid var(--c-line);
  background: var(--c-white);
  overflow: hidden;
}
.page-about .about-flow__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-flow {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}
.page-about .about-flow__step {
  position: relative;
  padding-top: 4px;
}
.page-about .about-flow__num {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-orange-deep);
  background: var(--c-orange-mist);
  border: 2px solid var(--c-orange);
}
.page-about .about-flow__step h3 {
  margin: 14px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-navy);
}
.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-navy-mid);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  display: grid;
  gap: 28px;
}
.page-about .about-network__fig {
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-navy);
  overflow: hidden;
}
.page-about .about-network__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: contain;
}
.page-about .about-network__list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-network__list li {
  border-left: 3px solid var(--c-jade);
  padding-left: 16px;
}
.page-about .about-network__list h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-navy);
}
.page-about .about-network__list p {
  margin: 0;
  line-height: 1.78;
  color: var(--c-navy-mid);
}

/* ---------- 资质卡片 ---------- */
.page-about .about-certs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}
.page-about .about-cert {
  position: relative;
  overflow: hidden;
  background: var(--c-orange-mist);
  border: 1px solid var(--c-line-soft);
  padding: 22px 20px;
  min-height: 210px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color var(--t-base);
}
.page-about .about-cert:hover,
.page-about .about-cert:focus-visible {
  border-color: var(--c-orange);
  outline: none;
}
.page-about .about-cert__tag {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-white);
  background: var(--c-jade-deep);
  padding: 3px 10px;
  border-radius: var(--r-pill);
}
.page-about .about-cert__num {
  display: block;
  font-family: var(--font-num);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-navy);
}
.page-about .about-cert__num em {
  font-style: normal;
  font-size: 15px;
  margin-left: 4px;
  color: var(--c-orange-deep);
}
.page-about .about-cert h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-navy);
}
.page-about .about-cert p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-navy-mid);
}
.page-about .about-cert__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  padding: 24px 22px;
  background: var(--c-navy);
  color: var(--c-orange-mist);
  font-size: 14px;
  line-height: 1.75;
  opacity: 0;
  transition: opacity var(--t-base);
}
.page-about .about-cert:hover .about-cert__overlay,
.page-about .about-cert:focus .about-cert__overlay,
.page-about .about-cert:focus-within .about-cert__overlay {
  opacity: 1;
}

/* ---------- 三条原则 ---------- */
.page-about .about-rules {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}
.page-about .about-rules li {
  border-left: 4px solid var(--c-orange);
  padding: 2px 0 2px 18px;
}
.page-about .about-rules h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-navy);
}
.page-about .about-rules p {
  margin: 0;
  max-width: 700px;
  line-height: 1.8;
  color: var(--c-navy-mid);
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: 36px;
  padding: 26px 24px;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}
.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 700px;
  line-height: 1.8;
  color: var(--c-navy-mid);
}
.page-about .about-cta__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式：平板 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 30px;
  }
  .page-about .about-network__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
  .page-about .about-sec {
    padding: 56px 0 64px;
  }
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: 44px;
    padding-top: 34px;
    padding-bottom: 84px;
  }
  .page-about .about-sec {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 48px;
    padding: 68px 0 78px;
  }
  .page-about .about-sec__rail {
    position: sticky;
    top: calc(var(--header-offset) + 24px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
  }
  .page-about .about-sec__num {
    font-size: 72px;
  }
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 30px;
  }
  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 24px;
    right: -30px;
    width: 30px;
    height: 2px;
    background: var(--grad-track);
    transform: rotate(-13deg);
    transform-origin: left center;
  }
  .page-about .about-network {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: 44px;
  }
  .page-about .about-network__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }
  .page-about .about-cta {
    margin-top: 46px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 30px 32px;
  }
  .page-about .about-cta__text {
    margin: 0;
    flex: 1 1 auto;
  }
  .page-about .about-cta__act {
    flex: 0 0 auto;
  }
}

/* ---------- 移动端资质卡改为常显说明 ---------- */
@media (max-width: 719px) {
  .page-about .about-cert {
    min-height: 0;
  }
  .page-about .about-cert__overlay {
    position: static;
    inset: auto;
    opacity: 1;
    background: transparent;
    color: var(--c-navy-mid);
    padding: 12px 0 0;
    font-size: 13px;
    line-height: 1.7;
  }
}

/* ---------- 无障碍与动效收敛 ---------- */
.page-about .about-cert:focus-visible {
  outline: 2px solid var(--c-orange-deep);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  .page-about .about-sec__num,
  .page-about .about-team__card,
  .page-about .about-cert,
  .page-about .about-cert__overlay {
    transition: none;
  }
}
</main>