.page-about {
  overflow-x: hidden;
  --about-rad: 10px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(126px, 19vw, 196px) clamp(38px, 5vw, 72px);
}

.page-about .about-hero .breadcrumb {
  margin-block-end: 26px;
}

.page-about .about-hero__frame {
  position: relative;
  padding-inline-end: 20px;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset-block: 4px;
  inset-inline-end: 0;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--line) 0 6px, transparent 6px 16px);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset-inline-end: 0;
  inset-block-end: -16px;
  width: 88px;
  height: 1px;
  background: var(--line);
}

.page-about .about-hero__index {
  margin: 0 0 20px;
  color: var(--tide);
}

.page-about .about-hero__title {
  margin: 0 0 24px;
  max-width: 17em;
}

.page-about .about-hero__lede {
  margin: 0 0 38px;
  max-width: 44ch;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__metaItem {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-hero__metaNum {
  font-size: 22px;
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.01em;
}

.page-about .about-hero__metaLabel {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
  opacity: 0.68;
  letter-spacing: 0.03em;
}

/* ---------- 通用两列 ---------- */
.page-about .about-two-col {
  row-gap: 18px;
}

.page-about .about-rail .index {
  margin: 0;
  color: var(--tide);
}

.page-about .about-body .section__title,
.page-about .about-body > .lede {
  margin-block: 0 16px;
}

.page-about .about-body .prose p {
  margin-block: 0 16px;
}

.page-about .about-body .prose p:last-child {
  margin-block-end: 0;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding-block-end: clamp(48px, 7vw, 88px);
}

/* ---------- 2026 改版 ---------- */
.page-about .about-upgrade__lede {
  margin-block-end: 28px;
}

.page-about .about-changes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-change {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--deepsea);
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-change:hover,
.page-about .about-change:focus-within {
  background: var(--glass);
  box-shadow: inset 3px 0 0 var(--orange);
}

.page-about .about-change__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-block-end: 10px;
}

.page-about .about-change__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-change__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.82;
}

/* ---------- 数据流程 ---------- */
.page-about .about-method__index {
  margin: 0 0 18px;
  color: var(--tide);
}

.page-about .about-method__title {
  margin: 0 0 16px;
}

.page-about .about-method__lede {
  margin: 0 0 40px;
  max-width: 46ch;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0 0 44px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-flow__node {
  position: relative;
  padding: 22px 4px 24px 22px;
  border-bottom: 1px solid var(--line);
  transition: background 180ms var(--ease);
}

.page-about .about-flow__node::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 28px;
  width: 10px;
  height: 10px;
  border: 1px solid var(--line);
  background: var(--abyss);
  transform: rotate(45deg);
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-flow__node:hover,
.page-about .about-flow__node:focus-visible {
  background: rgba(16, 35, 63, 0.55);
  outline: none;
}

.page-about .about-flow__node:hover::before,
.page-about .about-flow__node:focus-visible::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-flow__node:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-flow__no {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin-block-end: 10px;
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
  opacity: 0.8;
  max-width: 46ch;
}

.page-about .about-method__lower {
  row-gap: 22px;
  align-items: start;
}

.page-about .about-method__text .prose {
  margin-block: 0 16px;
}

.page-about .about-method__text .prose:last-child {
  margin-block-end: 0;
}

.page-about .about-method__figure {
  margin: 0;
  border-radius: var(--r-md);
}

/* ---------- 团队 ---------- */
.page-about .about-team__lede {
  margin-block-end: 0;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-block-start: 30px;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--orange);
}

.page-about .team-card .card__value {
  font-size: 52px;
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .team-card .card__title {
  margin: 0;
}

.page-about .team-card .card__foot {
  margin-block-start: auto;
  padding-block-start: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--tide);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.82;
}

.page-about .team-card--accent {
  background: var(--paper);
  border-color: var(--paper);
}

.page-about .team-card--accent .card__index {
  color: var(--tide);
}

.page-about .team-card--accent .card__value {
  color: var(--abyss);
}

.page-about .team-card--accent .card__title {
  color: var(--abyss);
}

.page-about .team-card--accent .team-card__desc {
  color: #2B3A4D;
  opacity: 1;
}

.page-about .team-card--accent .card__foot {
  border-top-color: rgba(5, 11, 24, 0.18);
  color: var(--tide);
}

/* ---------- 版本主线 ---------- */
.page-about .about-versions__index {
  margin: 0 0 18px;
  color: var(--tide);
}

.page-about .about-versions__title {
  margin: 0 0 16px;
}

.page-about .about-versions__lede {
  margin: 0 0 34px;
  max-width: 46ch;
}

.page-about .about-versions__figure {
  margin: 0 0 40px;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset-block: 8px;
  inset-inline-start: 5px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  margin-block-end: 12px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  inset-inline-start: -22px;
  inset-block-start: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--tide);
  background: var(--abyss);
}

.page-about .about-timeline__item:last-child::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .about-version {
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-version--current {
  border-color: rgba(255, 106, 43, 0.45);
}

.page-about .about-version__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "no year marker"
    "name name name";
  align-items: center;
  gap: 6px 12px;
  width: 100%;
  padding: 18px 18px;
  text-align: start;
  background: transparent;
  border: 0;
  cursor: pointer;
  color: inherit;
  font: inherit;
  transition: background 180ms var(--ease);
}

.page-about .about-version__head:hover {
  background: rgba(16, 35, 63, 0.6);
}

.page-about .about-version__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-version__no {
  grid-area: no;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-version__year {
  grid-area: year;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--archive);
  text-align: start;
}

.page-about .about-version__name {
  grid-area: name;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-version--current .about-version__name {
  color: var(--orange);
}

.page-about .about-version__marker {
  grid-area: marker;
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .about-version__marker::before,
.page-about .about-version__marker::after {
  content: "";
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: 50%;
  background: var(--tide);
  transform: translate(-50%, -50%);
  transition: transform 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-version__marker::before {
  width: 14px;
  height: 1px;
}

.page-about .about-version__marker::after {
  width: 1px;
  height: 14px;
}

.page-about .about-version__head[aria-expanded="true"] .about-version__marker::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .about-version__head[aria-expanded="true"] .about-version__marker::before {
  background: var(--orange);
}

.page-about .about-version__body {
  padding: 4px 18px 20px;
}

.page-about .about-version__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  opacity: 0.84;
  max-width: 60ch;
}

/* ---------- 协作与认可 ---------- */
.page-about .about-ecosystem__grid {
  row-gap: 24px;
}

.page-about .about-ecosystem__figure {
  margin: 0;
  border-radius: var(--r-md);
}

.page-about .about-ecosystem .index {
  margin: 0 0 14px;
  color: var(--tide);
}

/* ---------- 边界 ---------- */
.page-about .about-scope__inner {
  background: var(--paper);
  color: var(--abyss);
  border-radius: var(--r-md);
  padding: clamp(24px, 4vw, 46px);
}

.page-about .about-scope__index {
  margin: 0 0 16px;
  color: var(--tide);
}

.page-about .about-scope__title {
  margin: 0 0 28px;
  color: var(--abyss);
}

.page-about .about-scope__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-scope__colTitle {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #1C2A3D;
  padding-block-end: 10px;
  border-bottom: 1px solid rgba(5, 11, 24, 0.16);
}

.page-about .about-scope__col:last-child .about-scope__colTitle {
  color: #8A3A12;
}

.page-about .about-scope__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scope__list li {
  position: relative;
  padding-inline-start: 18px;
  margin-block-end: 12px;
  font-size: 15px;
  line-height: 1.72;
  color: #26364A;
}

.page-about .about-scope__list li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 10px;
  width: 8px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-scope__col:last-child .about-scope__list li::before {
  background: #8A3A12;
}

.page-about .about-scope__note {
  margin: 30px 0 0;
  padding-block-start: 20px;
  border-top: 1px solid rgba(5, 11, 24, 0.16);
  font-size: 14px;
  line-height: 1.75;
  color: #3A4A5E;
}

.page-about .about-scope__mail {
  color: #8A3A12;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-scope__mail:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 接着看 ---------- */
.page-about .about-next {
  padding-block-end: clamp(56px, 8vw, 96px);
}

.page-about .about-next__index {
  margin: 0 0 18px;
  color: var(--tide);
}

.page-about .about-next__row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

@media (min-width: 720px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-scope__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team-card--a {
    grid-column: span 7;
  }

  .page-about .team-card--b {
    grid-column: span 5;
  }

  .page-about .team-card--c {
    grid-column: span 5;
  }

  .page-about .team-card--d {
    grid-column: span 7;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__frame {
    padding-inline-end: 42px;
  }

  .page-about .about-two-col {
    column-gap: 24px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--line);
  }

  .page-about .about-flow__node {
    border-bottom: 0;
    border-inline-end: 1px solid var(--line);
    padding: 26px 18px 30px 22px;
  }

  .page-about .about-flow__node:last-child {
    border-inline-end: 0;
  }

  .page-about .about-flow__node::before {
    inset-block-start: -5px;
  }

  .page-about .about-versions__figure {
    margin-inline: calc(var(--gutter) * -1);
  }

  .page-about .about-timeline {
    padding-inline-start: 34px;
  }

  .page-about .about-timeline::before {
    inset-inline-start: 5px;
  }

  .page-about .about-timeline__item::before {
    inset-inline-start: -34px;
  }

  .page-about .about-version__head {
    grid-template-columns: 96px 1fr auto;
    grid-template-areas: "no year marker";
    padding: 20px 24px;
  }

  .page-about .about-version__name {
    grid-area: year;
    text-align: start;
  }

  .page-about .about-version__year {
    display: none;
  }

  .page-about .about-version__body {
    padding: 0 24px 24px 120px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-change,
  .page-about .about-flow__node,
  .page-about .about-version__marker::before,
  .page-about .about-version__marker::after {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}
</main>