.page-about {
  --about-rail: 208px;
  --about-gap: 44px;
  --about-radius-organic: 34px 14px 34px 14px;
  display: block;
  background: var(--c-cream);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 18px 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 26px 56px;
}

.page-about .about-hero__head {
  max-width: 40ch;
}

.page-about .about-hero__head .h-hero {
  margin-top: 14px;
  line-height: 1.06;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 34px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-xl) var(--radius-sm) var(--radius-xl) var(--radius-sm);
  overflow: hidden;
  background: linear-gradient(140deg, var(--c-night) 0%, var(--c-jade) 62%, var(--c-clay) 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .about-hero__text .lede {
  font-size: var(--fs-22);
  line-height: 1.62;
  color: var(--c-deep);
  font-weight: 600;
}

.page-about .about-hero__text p {
  max-width: 34em;
  color: var(--c-ink);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-bottom: 80px;
}

.page-about .about-nav {
  align-self: start;
}

.page-about .about-nav__label {
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  color: var(--c-rock);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.page-about .about-nav__list {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-nav__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-nav__list li {
  flex: 0 0 auto;
}

.page-about .about-nav__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: var(--c-paper);
  color: var(--c-deep);
  font-size: var(--fs-14);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur-1) var(--ease), background-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.page-about .about-nav__list a:hover,
.page-about .about-nav__list a:focus-visible {
  border-color: var(--c-gold);
  background: var(--c-gold-soft);
}

.page-about .about-nav__num {
  font-size: var(--fs-12);
  color: var(--c-jade);
}

.page-about .about-stream {
  display: grid;
  gap: 48px;
  min-width: 0;
}

.page-about .about-chapter,
.page-about .about-coverage,
.page-about .about-timeline,
.page-about .about-principles,
.page-about .about-next {
  scroll-margin-top: 90px;
}

.page-about .about-chapter .h-section,
.page-about .about-coverage .h-section,
.page-about .about-timeline .h-section,
.page-about .about-principles .h-section,
.page-about .about-next .h-section {
  margin-top: 12px;
  margin-bottom: 20px;
  line-height: 1.18;
}

.page-about .about-stream .prose p {
  max-width: 34em;
  color: var(--c-ink);
}

/* ---------- 三条路径 ---------- */
.page-about .route-trio {
  display: grid;
  gap: 16px;
  margin-top: 30px;
  padding: 0;
  list-style: none;
}

.page-about .route-trio__item {
  padding: 22px 20px 24px;
  border-radius: var(--about-radius-organic);
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-top-width: 4px;
}

.page-about .route-trio__item--jade {
  border-top-color: var(--c-jade);
}

.page-about .route-trio__item--gold {
  border-top-color: var(--c-gold);
}

.page-about .route-trio__item--coral {
  border-top-color: var(--c-coral);
}

.page-about .route-trio__tag {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-rock);
}

.page-about .route-trio__item strong {
  display: block;
  margin: 8px 0 10px;
  font-size: var(--fs-22);
  font-weight: 800;
  color: var(--c-deep);
}

.page-about .route-trio__item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 团队 ---------- */
.page-about .team-blocks {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .team-block {
  padding: 22px 22px 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: 30px 12px 30px 12px;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}

.page-about .team-block--content {
  border-left: 5px solid var(--c-jade);
}

.page-about .team-block--path {
  border-left: 5px solid var(--c-gold);
}

.page-about .team-block--frontend {
  border-left: 5px solid var(--c-mist);
}

.page-about .team-block--support {
  border-left: 5px solid var(--c-coral);
  background: linear-gradient(160deg, var(--c-paper) 0%, rgba(228, 113, 90, 0.08) 100%);
}

.page-about .team-block[open] {
  box-shadow: 0 18px 40px -28px rgba(11, 30, 60, 0.6);
}

.page-about .team-block summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-block summary::after {
  content: "展开职责";
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--c-jade);
}

.page-about .team-block[open] summary::after {
  content: "收起";
}

.page-about .team-block__name {
  font-family: var(--font-head);
  font-size: var(--fs-30);
  font-weight: 800;
  color: var(--c-deep);
  letter-spacing: 0.02em;
}

.page-about .team-block--support .team-block__name::before {
  content: "28";
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-68);
  line-height: 0.94;
  color: var(--c-coral);
  font-weight: 700;
}

.page-about .team-block__role {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-rock);
}

.page-about .team-block p {
  margin: 14px 0 2px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-ink);
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  padding-block: 44px;
  border-radius: var(--radius-xl);
}

.page-about .coverage-grid {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

.page-about .coverage-visual {
  position: relative;
  padding: 26px 22px 22px;
  border-radius: 40px 16px 40px 16px;
  background: var(--c-deep);
  color: var(--c-cream);
  overflow: hidden;
}

.page-about .coverage-dots {
  height: 108px;
  margin-bottom: 18px;
  border-radius: 18px;
  background-image: radial-gradient(circle, rgba(46, 139, 122, 0.85) 3px, transparent 3.6px);
  background-size: 19px 19px;
  background-position: 4px 4px;
  background-color: rgba(255, 255, 255, 0.06);
}

.page-about .coverage-visual__num {
  font-size: var(--fs-68);
  line-height: 0.9;
  color: var(--c-gold);
  font-weight: 700;
}

.page-about .coverage-visual__cap {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  color: var(--c-mist);
}

.page-about .coverage-panel {
  min-width: 0;
}

.page-about .industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .industry-card {
  padding: 14px 14px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm) var(--radius-md) var(--radius-sm) var(--radius-md);
  background: var(--c-paper);
}

.page-about .industry-card strong {
  display: block;
  font-size: var(--fs-17);
  font-weight: 800;
  color: var(--c-deep);
  margin-bottom: 6px;
}

.page-about .industry-card span {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--c-rock);
}

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

.page-about .filter-empty {
  margin-top: 18px;
  font-size: var(--fs-14);
  color: var(--c-rock);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  padding-block: 52px;
  border-radius: var(--radius-xl);
}

.page-about .about-timeline .prose p {
  color: var(--c-mist);
}

.page-about .about-timeline__figure {
  margin: 30px 0 34px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 5;
  object-fit: cover;
}

.page-about .version-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--c-line-dark);
}

.page-about .version-node {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 12px 0 12px 20px;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.18);
}

.page-about .version-node__year {
  font-size: var(--fs-14);
  letter-spacing: 0.1em;
  color: var(--c-gold-soft);
}

.page-about .version-node__detail summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  color: var(--c-cream);
  font-size: var(--fs-17);
  font-weight: 600;
}

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

.page-about .version-node__tag {
  display: inline-block;
  padding: 2px 9px;
  border: 1px solid var(--c-line-dark);
  border-radius: 999px;
  font-size: var(--fs-12);
  color: var(--c-gold-soft);
}

.page-about .version-node__detail p {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 企业对接 ---------- */
.page-about .flow-steps {
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  padding: 22px 20px;
  border: 1px solid var(--c-line);
  border-radius: 18px 30px 18px 30px;
  background: var(--c-paper);
}

.page-about .flow-step__num {
  display: inline-block;
  font-size: var(--fs-30);
  font-weight: 700;
  color: var(--c-coral);
  line-height: 1;
}

.page-about .flow-step .h-card {
  margin: 10px 0 8px;
}

.page-about .flow-step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-rock);
}

.page-about .about-chapter__note {
  margin-top: 24px;
  max-width: 34em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-rock);
  border-left: 3px solid var(--c-clay);
  padding-left: 14px;
}

/* ---------- 准则 ---------- */
.page-about .about-principles {
  padding-block: 48px;
  border-radius: var(--radius-xl);
}

.page-about .principle-list {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .principle-item {
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(247, 244, 238, 0.06);
  border-left: 3px solid var(--c-gold);
}

.page-about .principle-item .h-card {
  color: var(--c-cream);
  margin-bottom: 8px;
}

.page-about .principle-item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-principles__foot {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--c-line-light);
}

.page-about .about-principles__foot p {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: 8px 40px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 22px;
  padding: 28px 24px;
  border-radius: var(--radius-xl);
  background: var(--c-paper);
  border: 1px solid var(--c-line);
}

.page-about .about-next__copy .prose p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--c-rock);
}

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

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .route-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-blocks {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .team-block--content {
    grid-column: span 3;
  }

  .page-about .team-block--path {
    grid-column: span 3;
  }

  .page-about .team-block--frontend {
    grid-column: span 2;
  }

  .page-about .team-block--support {
    grid-column: span 4;
  }

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

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

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-bottom: 110px;
  }

  .page-about .about-nav {
    position: sticky;
    top: 92px;
  }

  .page-about .about-nav__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-nav__list a {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: var(--fs-14);
  }

  .page-about .about-coverage {
    padding-block: 56px;
  }

  .page-about .about-timeline {
    padding-block: 62px;
  }

  .page-about .about-principles {
    padding-block: 58px;
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 34px 32px;
  }

  .page-about .about-next__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1200px) {
  .page-about {
    --about-rail: 232px;
    --about-gap: 56px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  }
}

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