.page-about {
  --about-rail-w: 258px;
  --about-tick-gap: 42px;
  background: var(--paper-50);
  color: var(--ink-900);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    linear-gradient(160deg, #0A1A33 0%, #0A1A33 52%, #153059 100%);
  color: var(--white);
  padding-block: 96px 64px;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -60px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(255, 106, 26, .38), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: 40px;
}

.page-about .about-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: rgba(255, 255, 255, .66);
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 10px;
  color: rgba(255, 255, 255, .34);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(255, 255, 255, .76);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--orange-500);
}

.page-about .about-hero__eyebrow {
  position: relative;
  z-index: 1;
  margin: 0 0 20px;
  font-size: 13px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--lime-400);
}

.page-about .about-hero__title {
  position: relative;
  z-index: 1;
  margin: 0 0 26px;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin-top: 26px;
  background: var(--orange-500);
}

.page-about .about-hero__lede {
  position: relative;
  z-index: 1;
  margin: 0 0 48px;
  max-width: 660px;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(255, 255, 255, .84);
}

.page-about .about-hero__facts {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 32px;
  margin: 0;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, .16);
}

.page-about .about-hero__facts dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(255, 255, 255, .54);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
  color: var(--white);
  letter-spacing: .01em;
}

.page-about .about-hero__facts div:nth-child(3) dd,
.page-about .about-hero__facts div:nth-child(4) dd {
  color: var(--lime-400);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-block: 56px 96px;
}

.page-about .about-rail {
  position: relative;
}

.page-about .about-rail__label {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--slate-400);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rail__list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 12px 12px 14px;
  border-left: 1px solid var(--line-200);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-900);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--slate-400);
  transition: color var(--dur) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-left-color: var(--orange-500);
  background: var(--sand-100);
  color: var(--orange-700);
  outline: none;
}

.page-about .about-rail__list a:hover .about-rail__num,
.page-about .about-rail__list a:focus-visible .about-rail__num {
  color: var(--orange-500);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-stream {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 88px;
}

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-section .exhibit-label {
  margin: 0 0 16px;
}

.page-about .about-section .section-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.18;
  letter-spacing: -.005em;
}

.page-about .about-section .lede {
  margin: 0 0 36px;
  max-width: 640px;
  font-family: var(--font-editorial);
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--navy-700);
}

.page-about .about-prose p {
  margin: 0 0 20px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: 36px 0;
  padding: 22px 0 22px 26px;
  border-left: 3px solid var(--orange-500);
  background: linear-gradient(90deg, var(--sand-100), transparent 72%);
}

.page-about .about-quote p {
  margin: 0 0 12px;
  font-family: var(--font-editorial);
  font-size: clamp(17px, 1.9vw, 22px);
  line-height: 1.7;
  color: var(--navy-900);
}

.page-about .about-quote cite {
  font-style: normal;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--slate-400);
}

/* ---------- 三大支柱 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border-top: 1px solid var(--line-200);
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-pillars li {
  background: var(--paper-50);
  padding: 24px 4px;
}

.page-about .about-pillars h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--navy-900);
}

.page-about .about-pillars p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-400);
}

/* ---------- 场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border-top: 1px solid var(--line-200);
}

.page-about .about-scene {
  background: var(--paper-50);
  padding: 30px 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-scene__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--orange-700);
}

.page-about .about-scene h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.35;
  color: var(--navy-900);
}

.page-about .about-scene p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .about-scene__link {
  justify-self: start;
  font-size: 14px;
  font-weight: 600;
  color: var(--orange-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-scene__link:hover,
.page-about .about-scene__link:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
  outline: none;
}

/* ---------- 内容体系 ---------- */
.page-about .about-taxonomy {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.page-about .about-taxonomy__list ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-taxonomy__list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-taxonomy__list li:first-child {
  border-top: 1px solid var(--line-200);
}

.page-about .about-taxonomy__idx {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--orange-500);
  padding-top: 3px;
}

.page-about .about-taxonomy__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--navy-900);
}

.page-about .about-taxonomy__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-400);
}

.page-about .about-taxonomy__side {
  display: grid;
  gap: 14px;
}

.page-about .about-taxonomy__side .data-block {
  border-top: 2px solid var(--orange-500);
}

.page-about .about-taxonomy__side .data-block--lime {
  border-top-color: var(--lime-400);
}

.page-about .about-taxonomy__side .data-block__value small {
  font-size: 13px;
  font-weight: 500;
  margin-left: 4px;
  opacity: .72;
}

.page-about .about-taxonomy__note {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--navy-700);
}

.page-about .about-taxonomy__link {
  justify-self: start;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 0 0 40px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--paper-200);
  border: 1px solid var(--line-200);
}

.page-about .about-figure .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-400);
}

/* ---------- 版本折叠 ---------- */
.page-about .about-versions {
  border-top: 1px solid var(--line-200);
}

.page-about .about-version {
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-version__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 0;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--ink-900);
  transition: color var(--dur) var(--ease);
}

.page-about .about-version__trigger:hover,
.page-about .about-version__trigger:focus-visible {
  color: var(--orange-700);
  outline: 2px solid var(--orange-500);
  outline-offset: 4px;
}

.page-about .about-version__badge {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--navy-900);
  color: var(--lime-400);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
}

.page-about .about-version__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-version__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
}

.page-about .about-version__year {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.page-about .about-version__body {
  padding: 0 0 26px 64px;
}

.page-about .about-version__body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .about-version__body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-version__body li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--navy-700);
}

.page-about .about-version__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 2px;
  background: var(--orange-500);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  border-top: 1px solid var(--line-200);
  margin-bottom: 26px;
}

.page-about .about-roles__head,
.page-about .about-roles__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-roles__head {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--slate-400);
}

.page-about .about-roles__head span:last-child {
  display: none;
}

.page-about .about-roles__row {
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-roles__role {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--navy-900);
  letter-spacing: .02em;
}

.page-about .about-roles__row .mono {
  font-size: 12px;
  color: var(--lime-800);
}

.page-about .about-roles__row span:last-child {
  color: var(--slate-400);
}

.page-about .about-team-note {
  margin: 0;
  padding: 20px 22px;
  background: var(--paper-200);
  font-size: 15px;
  line-height: 1.8;
  color: var(--navy-900);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-200);
  border-top: 1px solid var(--line-200);
  border-bottom: 1px solid var(--line-200);
  margin-bottom: 44px;
}

.page-about .about-partner {
  background: var(--paper-50);
  padding: 26px 22px 26px 0;
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--navy-900);
}

.page-about .about-partner h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  background: var(--orange-500);
  vertical-align: middle;
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .about-long {
  padding: 28px 26px;
  background: var(--navy-900);
  color: var(--white);
}

.page-about .about-long h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.2vw, 24px);
  color: var(--white);
}

.page-about .about-long p {
  margin: 0 0 24px;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .8);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero {
    padding-block: 120px 80px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-pillars li {
    padding: 26px 22px;
  }

  .page-about .about-pillars li:first-child {
    padding-left: 0;
  }

  .page-about .about-pillars li:last-child {
    padding-right: 0;
  }

  .page-about .about-scene {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 8px 24px;
    padding: 32px 0;
  }

  .page-about .about-scene__tag {
    grid-row: 1 / span 3;
    padding-top: 4px;
  }

  .page-about .about-scene h3,
  .page-about .about-scene p,
  .page-about .about-scene__link {
    grid-column: 2;
  }

  .page-about .about-version__body {
    padding-left: 64px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 72px;
    padding-block: 88px 128px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 36px);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 72px);
  }

  .page-about .about-stream {
    gap: 112px;
  }

  .page-about .about-taxonomy {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

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

  .page-about .about-partner {
    padding: 30px 30px 30px 0;
  }

  .page-about .about-partner + .about-partner {
    padding-left: 30px;
  }

  .page-about .about-roles__head,
  .page-about .about-roles__row {
    grid-template-columns: 160px 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-roles__head span:last-child {
    display: block;
  }

  .page-about .about-long {
    padding: 40px 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .about-scene__link,
  .page-about .about-version__trigger {
    transition: none;
  }
}