.page-about {
  --about-cut: 16px;
  --about-gap: clamp(18px, 3vw, 32px);
  background: var(--ink);
  color: var(--paper);
}

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

.page-about .section {
  padding: clamp(44px, 7vw, 92px) 0;
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--steel);
}

.page-about .breadcrumb__link {
  color: var(--steel);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--lime);
}

.page-about .breadcrumb__current {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  padding: clamp(22px, 4vw, 40px) 0 clamp(34px, 5vw, 60px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -25%;
  width: 85%;
  height: 130%;
  background: radial-gradient(circle at 55% 45%, rgba(200, 255, 61, 0.16), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lime) 0 22%, rgba(169, 188, 199, 0.25) 22% 100%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 64px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 12px 0 16px;
  color: var(--paper);
}

.page-about .about-hero__lead .lede {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.84);
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 20px;
}

.page-about .about-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__jump a {
  display: inline-block;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-hero__jump a:hover,
.page-about .about-hero__jump a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
  background: var(--ink-2);
}

.page-about .about-hero__media figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-hero__stats {
  position: relative;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-hero__stats .stat__num {
  display: block;
  font-size: clamp(26px, 6vw, 44px);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--steel);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-scope__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-scope__aside {
  background: var(--ink-2);
  color: var(--paper);
  padding: 24px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-scope__aside .eyebrow {
  color: var(--lime);
  margin: 0 0 10px;
}

.page-about .about-scope__pin {
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-scope__note {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 247, 242, 0.78);
  margin: 0 0 16px;
}

.page-about .about-scope__body h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--ink);
}

.page-about .about-scope__body p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--grey);
  margin: 0 0 16px;
  max-width: 42em;
}

.page-about .about-scope__link {
  margin-top: 20px;
}

.page-about .about-scope__link a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--lime);
  padding-bottom: 2px;
}

.page-about .about-scope__link a:hover,
.page-about .about-scope__link a:focus-visible {
  color: var(--wine);
}

/* ---------- 短路径 ---------- */
.page-about .about-paths {
  background: var(--ink);
}

.page-about .about-paths .section__head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-paths .eyebrow {
  color: var(--lime);
}

.page-about .about-paths .section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.8vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 8px 0 12px;
  color: var(--paper);
}

.page-about .about-paths .lede {
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.78);
  max-width: 40em;
  margin: 0;
}

.page-about .about-path {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-path__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-path__num {
  grid-row: 1 / span 2;
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  padding-top: 3px;
}

.page-about .about-path__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
  color: var(--paper);
}

.page-about .about-path__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.76);
}

.page-about .about-paths__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--coral);
  background: rgba(20, 36, 61, 0.75);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow {
  background: var(--ink-2);
}

.page-about .about-flow .section__head {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-flow .eyebrow {
  color: var(--lime);
}

.page-about .about-flow .section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.8vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  margin: 8px 0 12px;
  color: var(--paper);
}

.page-about .about-flow .lede {
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.78);
  max-width: 40em;
  margin: 0;
}

.page-about .about-flow__layout {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-flow__media {
  margin: 0;
  border: 1px solid var(--line);
}

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

.page-about .about-flow__media .media-frame__cap {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
  padding: 10px 14px;
  background: rgba(11, 43, 38, 0.7);
}

.page-about .about-flow__steps {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-flow__step {
  background: var(--ink-2);
  padding: 20px 18px;
}

.page-about .about-flow__no {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--olive);
  border: 1px solid rgba(111, 143, 30, 0.6);
  padding: 3px 8px;
  margin-bottom: 10px;
}

.page-about .about-flow__step h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.76);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-versions .section__head {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-versions .eyebrow {
  color: var(--olive);
}

.page-about .about-versions .section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.8vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  margin: 8px 0 12px;
  color: var(--ink);
}

.page-about .about-versions .lede {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--grey);
  max-width: 42em;
  margin: 0;
}

.page-about .about-versions__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-versions__rail {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-vrail {
  display: grid;
  gap: 4px;
  padding-left: 16px;
  border-left: 1px solid var(--line-dark);
}

.page-about .about-vrail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px dotted rgba(11, 43, 38, 0.18);
}

.page-about .about-vrail__link .mono {
  font-size: 11.5px;
  color: var(--olive);
  min-width: 16px;
}

.page-about .about-vrail__link:hover,
.page-about .about-vrail__link:focus-visible {
  color: var(--wine);
  border-bottom-color: var(--wine);
}

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

.page-about .about-versions__media img {
  display: block;
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  background: var(--ink-2);
}

.page-about .about-vnode {
  padding: 0 0 20px 18px;
  border-left: 2px solid var(--lime);
  margin-bottom: 20px;
  scroll-margin-top: 96px;
}

.page-about .about-vnode:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-vnode h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-vnode p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--grey);
  max-width: 40em;
}

.page-about .about-vnode a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--lime);
}

.page-about .about-vnode a:hover,
.page-about .about-vnode a:focus-visible {
  color: var(--wine);
}

/* ---------- 合作网络 ---------- */
.page-about .about-net {
  background: var(--ink);
}

.page-about .about-net .section__head {
  margin-bottom: clamp(22px, 4vw, 34px);
}

.page-about .about-net .eyebrow {
  color: var(--lime);
}

.page-about .about-net .section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.8vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  margin: 8px 0 12px;
  color: var(--paper);
}

.page-about .about-net .lede {
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(244, 247, 242, 0.78);
  max-width: 40em;
  margin: 0;
}

.page-about .about-net__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-net__tab {
  appearance: none;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--steel);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 10px 14px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-net__tab:hover,
.page-about .about-net__tab:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
}

.page-about .about-net__tab[aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-net__count {
  font-size: 12px;
  opacity: 0.75;
}

.page-about .about-net__panel {
  margin-top: 20px;
  padding: 22px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-net__panel h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-net__panel p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 247, 242, 0.78);
  max-width: 42em;
}

.page-about .about-net__panel .tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-net__cta {
  margin: 18px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
}

.page-about .about-team__intro .eyebrow {
  color: var(--olive);
}

.page-about .about-team__intro h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.8vw, 40px);
  font-weight: 800;
  line-height: 1.12;
  margin: 8px 0 14px;
  color: var(--ink);
}

.page-about .about-team__intro p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
  margin: 0 0 14px;
  max-width: 34em;
}

.page-about .about-team__honor {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--wine);
  border-top: 1px solid var(--line-dark);
  padding-top: 14px;
}

.page-about .about-acc {
  background: var(--white);
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--olive);
  margin-bottom: 10px;
}

.page-about .about-acc summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 16px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-acc summary::-webkit-details-marker {
  display: none;
}

.page-about .about-acc summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--olive);
}

.page-about .about-acc[open] summary::after {
  content: "−";
  color: var(--wine);
}

.page-about .about-acc summary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: -3px;
}

.page-about .about-acc__body {
  padding: 0 16px 16px;
}

.page-about .about-acc__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}

.page-about .about-cta__text .eyebrow {
  color: var(--lime);
}

.page-about .about-cta__text h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 800;
  line-height: 1.14;
  margin: 8px 0 12px;
  color: var(--paper);
}

.page-about .about-cta__text p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 242, 0.78);
  margin: 0 0 18px;
  max-width: 38em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__contact {
  border: 1px solid var(--line);
  padding: 20px;
  background: rgba(11, 43, 38, 0.6);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-cta__label {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--olive);
  margin: 0 0 12px;
}

.page-about .about-cta__line {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 15px;
}

.page-about .about-cta__line a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.45);
}

.page-about .about-cta__line a:hover,
.page-about .about-cta__line a:focus-visible {
  color: var(--paper);
}

.page-about .about-cta__meta {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-path__item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 8px 18px;
    padding: 24px 0;
  }

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

  .page-about .about-net__panel {
    padding: 26px 24px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.6fr);
    align-items: start;
  }

  .page-about .about-scope__aside {
    position: sticky;
    top: 96px;
  }

  .page-about .about-flow__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.7fr);
    align-items: start;
  }

  .page-about .about-vrail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.5fr);
    align-items: start;
  }

  .page-about .about-net__panel {
    padding: 30px 28px;
  }
}