.page-about {
  --about-rail: 0px;
}

.page-about .ax-shell {
  padding-inline: var(--ax-gutter);
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .ax-crumbs {
  padding-top: clamp(20px, 3vw, 34px);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
}

.page-about__crumb-now {
  color: var(--ax-ink);
  font-weight: 700;
}

.page-about__hero {
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about__hero-grid {
  margin-top: clamp(22px, 3vw, 40px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about__hero-copy h1 {
  margin: 12px 0 20px;
  font-family: var(--ax-font-sans);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.14;
  font-size: clamp(32px, 5.2vw, 58px);
  color: var(--ax-text);
  max-width: 15ch;
}

.page-about__hero-copy .ax-lede {
  max-width: 42ch;
  color: var(--ax-slate);
  font-size: clamp(16.5px, 1.6vw, 19px);
  line-height: 1.78;
}

.page-about__hero-media {
  margin: 0;
}

.page-about__hero-media .ax-media__frame {
  border-radius: var(--ax-radius-lg);
  overflow: hidden;
  border: 1px solid var(--ax-line-soft);
  background: var(--ax-slate-soft);
}

.page-about__hero-media .ax-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about__hero-media .ax-media__cap {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ax-slate-mid);
  line-height: 1.6;
}

/* ---------- 首屏数据 ---------- */
.page-about__stats {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ax-line-soft);
  border: 1px solid var(--ax-line-soft);
  border-radius: var(--ax-radius-md);
  overflow: hidden;
}

.page-about__stat {
  background: var(--ax-white);
  padding: 16px 18px 18px;
}

.page-about__stat dt {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ax-slate);
}

.page-about__stat dd {
  margin: 8px 0 0;
  font-family: var(--ax-font-mono);
  font-weight: 800;
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1;
  color: var(--ax-ink);
  letter-spacing: 0.01em;
}

/* ---------- 通用两栏骨架 ---------- */
.page-about__row {
  row-gap: clamp(20px, 3vw, 32px);
}

.page-about__aside {
  align-self: start;
}

.page-about__aside-note {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--ax-slate-mid);
  line-height: 1.6;
}

.page-about__columns,
.page-about__team {
  padding-block: clamp(44px, 6vw, 88px);
  border-top: 1px solid var(--ax-line-soft);
}

.page-about__review,
.page-about__history {
  padding-block: clamp(44px, 6vw, 88px);
  border-top: 1px solid var(--ax-line-soft);
}

.page-about__cadence,
.page-about__partner {
  padding-block: clamp(44px, 6vw, 88px);
  border-top: 1px solid var(--ax-line-soft);
}

.page-about__partner {
  padding-bottom: clamp(56px, 7vw, 104px);
}

.page-about .ax-section__title {
  margin: 10px 0 18px;
  font-family: var(--ax-font-sans);
  font-weight: 800;
  letter-spacing: -0.008em;
  line-height: 1.2;
  font-size: clamp(24px, 3vw, 38px);
  color: var(--ax-text);
  max-width: 22ch;
}

.page-about .ax-lede {
  color: var(--ax-slate);
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.8;
  max-width: 60ch;
}

.page-about__footnote {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ax-slate);
  max-width: 62ch;
}

.page-about__link {
  color: var(--ax-ink-mid);
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 4px;
  transition: color 140ms var(--ax-ease), text-decoration-style 140ms var(--ax-ease);
}

.page-about__link:hover,
.page-about__link:focus-visible {
  color: var(--ax-ink);
  text-decoration-style: solid;
}

/* ---------- 栏目层级 ---------- */
.page-about__tree {
  margin-top: clamp(24px, 3vw, 38px);
}

.page-about__tree-root {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 13px 24px;
  border-radius: var(--ax-radius-pill);
  background: var(--ax-ink);
  color: var(--ax-white);
  font-weight: 800;
  font-size: clamp(15px, 1.6vw, 17px);
  letter-spacing: 0.01em;
}

.page-about__tree-root-tag {
  font-family: var(--ax-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--ax-amber);
}

.page-about__branches {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ax-line-soft);
  border: 1px solid var(--ax-line-soft);
  border-radius: var(--ax-radius-md);
  overflow: hidden;
}

.page-about__branch {
  display: flex;
  align-items: baseline;
  gap: 12px;
  background: var(--ax-white);
  padding: 15px 18px;
  transition: background 160ms var(--ax-ease);
}

.page-about__branch:hover,
.page-about__branch:focus-within {
  background: var(--ax-paper);
}

.page-about__branch-code {
  font-family: var(--ax-font-mono);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ax-ink-mid);
  flex: 0 0 auto;
}

.page-about__branch-name {
  flex: 1 1 auto;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ax-text);
  line-height: 1.4;
}

.page-about__branch-count {
  flex: 0 0 auto;
  font-family: var(--ax-font-mono);
  font-size: 11.5px;
  color: var(--ax-slate-mid);
  letter-spacing: 0.04em;
}

.page-about__tree-media {
  margin: clamp(28px, 3.6vw, 44px) 0 0;
}

.page-about__tree-media .ax-media__frame {
  border-radius: var(--ax-radius-md);
  overflow: hidden;
  border: 1px solid var(--ax-line-soft);
  background: var(--ax-slate-soft);
}

.page-about__tree-media .ax-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about__tree-media .ax-media__cap {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ax-slate-mid);
  line-height: 1.6;
}

/* ---------- 三校三审流程 ---------- */
.page-about__flow {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about__step {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--ax-radius-sm);
  background: var(--ax-white);
  border: 1px solid var(--ax-line-soft);
  transition: border-color 160ms var(--ax-ease), transform 160ms var(--ax-ease);
}

.page-about__step:hover {
  border-color: var(--ax-ink-mid);
}

.page-about__step-num {
  display: block;
  font-family: var(--ax-font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ax-ink-mid);
  margin-bottom: 10px;
}

.page-about__step-name {
  display: block;
  font-size: 15.5px;
  font-weight: 800;
  color: var(--ax-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.page-about__step-desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--ax-slate);
}

.page-about__step--final {
  border-color: rgba(224, 138, 44, 0.55);
  background: linear-gradient(180deg, rgba(224, 138, 44, 0.10), rgba(224, 138, 44, 0.02));
}

.page-about__step--final .page-about__step-num {
  color: var(--ax-amber);
}

/* ---------- 团队折叠 ---------- */
.page-about .page-about__crew-item {
  background: var(--ax-white);
  border: 1px solid var(--ax-line-soft);
  border-radius: var(--ax-radius-md);
  overflow: hidden;
  transition: border-color 160ms var(--ax-ease);
}

.page-about .page-about__crew-item + .page-about__crew-item {
  margin-top: 12px;
}

.page-about .page-about__crew-item[open] {
  border-color: rgba(15, 58, 49, 0.38);
}

.page-about .page-about__crew-item > .ax-fold__summary {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
  transition: background 160ms var(--ax-ease);
}

.page-about .page-about__crew-item > .ax-fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .page-about__crew-item > .ax-fold__summary:hover {
  background: var(--ax-paper);
}

.page-about__crew-count {
  flex: 0 0 auto;
  font-family: var(--ax-font-mono);
  font-weight: 800;
  font-size: clamp(30px, 3.4vw, 42px);
  line-height: 1;
  color: var(--ax-ink);
  min-width: 2.2em;
}

.page-about__crew-name {
  flex: 1 1 auto;
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 800;
  color: var(--ax-text);
}

.page-about__crew-hint {
  flex: 0 0 auto;
  font-family: var(--ax-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ax-slate-mid);
}

.page-about .page-about__crew-item > .ax-fold__body {
  padding: 0 22px 22px;
  color: var(--ax-slate);
  font-size: 15px;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 时间轴 ---------- */
.page-about__tl {
  list-style: none;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ax-line-soft);
}

.page-about__tl-item {
  border-bottom: 1px solid var(--ax-line-soft);
  position: relative;
}

.page-about .page-about__tl-fold > .ax-fold__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding: 22px 6px 22px 30px;
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: background 160ms var(--ax-ease);
}

.page-about .page-about__tl-fold > .ax-fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .page-about__tl-fold > .ax-fold__summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ax-white);
  border: 2px solid var(--ax-slate-mid);
  box-sizing: border-box;
  transition: background 160ms var(--ax-ease), border-color 160ms var(--ax-ease);
}

.page-about .page-about__tl-fold[open] > .ax-fold__summary::before {
  background: var(--ax-amber);
  border-color: var(--ax-amber);
}

.page-about .page-about__tl-fold > .ax-fold__summary:hover {
  background: rgba(15, 58, 49, 0.035);
}

.page-about__tl-year {
  flex: 0 0 auto;
  font-family: var(--ax-font-mono);
  font-weight: 800;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ax-ink);
}

.page-about__tl-title {
  flex: 1 1 auto;
  font-size: clamp(15.5px, 1.6vw, 17.5px);
  font-weight: 700;
  color: var(--ax-text);
  line-height: 1.45;
}

.page-about .page-about__tl-fold > .ax-fold__body {
  padding: 0 6px 24px 30px;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ax-slate);
}

.page-about__tl-media {
  margin: clamp(30px, 4vw, 48px) 0 0;
  max-width: 420px;
}

.page-about__tl-media .ax-media__frame {
  border-radius: var(--ax-radius-md);
  overflow: hidden;
  border: 1px solid var(--ax-line-soft);
  background: var(--ax-slate-soft);
}

.page-about__tl-media .ax-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 5 / 6;
}

.page-about__tl-media .ax-media__cap {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ax-slate-mid);
  line-height: 1.6;
}

/* ---------- 更新节奏 ---------- */
.page-about__cadence {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ax-line-soft);
}

.page-about .page-about__cadence-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ax-line-soft);
}

.page-about__cadence-key {
  font-family: var(--ax-font-mono);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ax-ink-mid);
}

.page-about__cadence-val {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ax-text);
}

.page-about__geo {
  margin-top: clamp(28px, 3.6vw, 44px);
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--ax-radius-lg);
  background: var(--ax-paper);
  border: 1px solid var(--ax-line-soft);
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__geo-figure {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about__geo-num {
  font-family: var(--ax-font-mono);
  font-weight: 800;
  font-size: clamp(46px, 6.4vw, 76px);
  line-height: 0.9;
  color: var(--ax-ink);
  letter-spacing: -0.01em;
}

.page-about__geo-unit {
  font-size: clamp(15px, 1.6vw, 18px);
  font-weight: 700;
  color: var(--ax-slate);
}

.page-about__geo-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ax-slate);
  max-width: 58ch;
}

/* ---------- 合作与沟通 ---------- */
.page-about__partner-card {
  margin-top: clamp(26px, 3.4vw, 40px);
  border-radius: var(--ax-radius-lg);
  background: var(--ax-ink);
  color: var(--ax-white);
  padding: clamp(26px, 3.6vw, 46px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}

.page-about__partner-kicker {
  margin: 0 0 10px;
  font-family: var(--ax-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--ax-amber);
}

.page-about__partner-card h3 {
  margin: 0 0 14px;
  font-family: var(--ax-font-sans);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.35;
  letter-spacing: -0.005em;
  color: var(--ax-white);
}

.page-about__partner-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
  max-width: 54ch;
}

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

.page-about__cta .ax-btn {
  white-space: nowrap;
}

.page-about__cta-ghost {
  color: var(--ax-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.page-about__cta-ghost:hover,
.page-about__cta-ghost:focus-visible {
  background: rgba(255, 255, 255, 0.10);
  border-color: var(--ax-white);
  color: var(--ax-white);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--ax-amber);
  outline-offset: 3px;
  border-radius: var(--ax-radius-sm);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about__cadence-item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 768px) {
  .page-about__flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about__geo {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.6fr);
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about__partner-card {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 36px;
  }

  .page-about__cta {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about__branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about__flow {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
</main>