.page-about {
  background: var(--deep);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding-inline: var(--gutter);
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(20px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(244, 241, 234, .5);
}
.page-about .breadcrumb__item {
  color: inherit;
  text-decoration: none;
}
.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--cyan);
}
.page-about .breadcrumb__sep {
  color: rgba(244, 241, 234, .28);
}

/* ---------- 通用标题区 ---------- */
.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(28px, 5vw, 52px);
}
.page-about .about-head--tight {
  margin-bottom: clamp(20px, 4vw, 36px);
}
.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}
.page-about .headline {
  margin: 0 0 18px;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--paper);
}
.page-about .headline--xl {
  font-size: clamp(32px, 6.6vw, 72px);
  line-height: 1.04;
  letter-spacing: -.03em;
}
.page-about .prose {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.75;
  color: rgba(244, 241, 234, .76);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(14px, 2vw, 20px);
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(28px, 5vw, 56px);
  align-items: center;
}
.page-about .about-hero__copy em {
  font-style: normal;
  color: var(--cyan);
  box-shadow: inset 0 -0.16em 0 var(--cyan-wash);
}
.page-about .about-lead {
  font-size: clamp(15px, 1.5vw, 17px);
  color: rgba(244, 241, 234, .82);
  max-width: 34em;
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0;
  margin-top: clamp(24px, 4vw, 40px);
  border-top: 2px solid var(--hairline-strong);
}
.page-about .about-hero__facts .kpi {
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--hairline);
}
.page-about .about-hero__facts .kpi__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 22px var(--cyan-wash);
}
.page-about .about-hero__facts .kpi--coral .kpi__num {
  color: var(--coral);
  text-shadow: 0 0 22px var(--coral-wash);
}
.page-about .about-hero__facts .kpi__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(244, 241, 234, .6);
  margin-left: 4px;
}
.page-about .about-hero__facts .kpi__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(244, 241, 234, .55);
}
.page-about .about-hero__media {
  margin: 0;
}
.page-about .about-hero__media .frame-media {
  border: 2px solid var(--hairline-strong);
  box-shadow: 10px 10px 0 var(--carbon);
  overflow: hidden;
}
.page-about .about-hero__media img,
.page-about .about-flow__media img,
.page-about .about-history__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .fig-cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(244, 241, 234, .5);
}

/* ---------- 团队构成 ---------- */
.page-about .about-roles__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .about-role {
  position: relative;
  padding: 26px 24px 30px;
  border: 2px solid var(--hairline-strong);
  background: rgba(244, 241, 234, .02);
  box-shadow: 7px 7px 0 var(--carbon);
  transition: transform .18s ease, box-shadow .18s ease;
}
.page-about .about-role--accent {
  border-color: var(--cyan);
  background: var(--cyan-wash);
}
.page-about .about-role__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--coral);
  margin: 0 0 16px;
}
.page-about .about-role__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-role__text {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 234, .72);
}
.page-about .about-role .tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  border: 1px solid var(--hairline-strong);
  color: rgba(244, 241, 234, .72);
}
.page-about .about-role .tag--cyan {
  border-color: var(--cyan);
  color: var(--cyan);
}
.page-about .about-role .tag--coral {
  border-color: var(--coral);
  color: var(--coral);
}

/* ---------- 记录链路 ---------- */
.page-about .about-flow-sec {
  background:
    linear-gradient(180deg, rgba(5, 9, 15, .0) 0%, rgba(5, 9, 15, .55) 100%);
  border-top: 1px solid var(--hairline-soft);
}
.page-about .about-flow__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
}
.page-about .about-flow__media {
  margin: 0;
}
.page-about .about-flow__media .frame-media {
  border: 2px solid var(--hairline-strong);
  box-shadow: -9px 9px 0 var(--carbon);
  overflow: hidden;
}
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}
.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 20px 0;
  border-top: 1px solid var(--hairline);
}
.page-about .about-flow__step:last-child {
  border-bottom: 1px solid var(--hairline);
}
.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--cyan);
}
.page-about .about-flow__title {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 234, .7);
  max-width: 36em;
}

/* ---------- 共建基地 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
}
.page-about .about-partners__copy .btn {
  margin-top: 10px;
}
.page-about .about-partners__list {
  border-top: 2px solid var(--coral);
  padding-top: 22px;
}
.page-about .about-partners__lt {
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}
.page-about .about-partners__items {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}
.page-about .about-partners__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
}
.page-about .about-partners__b {
  font-size: 14px;
  font-weight: 700;
  color: var(--coral);
}
.page-about .about-partners__t {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244, 241, 234, .68);
}
.page-about .about-partners__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .03em;
  color: rgba(244, 241, 234, .5);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__media {
  margin: 0 0 clamp(28px, 5vw, 48px);
}
.page-about .about-history__media .frame-media {
  border: 2px solid var(--hairline-strong);
  box-shadow: 10px 10px 0 var(--carbon);
  overflow: hidden;
}
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 2px solid var(--line);
}
.page-about .about-node {
  position: relative;
  padding: 0 0 4px;
}
.page-about .about-node__dot {
  position: absolute;
  left: -34px;
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--deep);
  border: 2px solid var(--line);
  transform: rotate(45deg);
}
.page-about .about-node--now .about-node__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 14px var(--cyan-wash);
}
.page-about .about-node__d {
  border-bottom: 1px solid var(--hairline);
}
.page-about .about-node__sum {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: transform .16s ease, color .16s ease;
}
.page-about .about-node__sum::-webkit-details-marker {
  display: none;
}
.page-about .about-node__sum:hover {
  transform: translateX(4px);
}
.page-about .about-node__sum:hover::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 16px;
  width: 2px;
  height: calc(100% - 32px);
  background: var(--cyan);
}
.page-about .about-node__era {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .about-node--now .about-node__era {
  color: var(--coral);
}
.page-about .about-node__name {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .about-node__desc {
  margin: 0;
  padding: 0 0 20px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 241, 234, .7);
  max-width: 40em;
}

/* ---------- 覆盖范围（米白底） ---------- */
.page-about .about-coverage {
  background: var(--paper);
  color: var(--ink);
}
.page-about .about-coverage .eyebrow {
  color: #0E8E7C;
}
.page-about .about-coverage .headline {
  color: var(--ink);
}
.page-about .about-coverage .prose {
  color: rgba(16, 20, 24, .72);
}
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
}
.page-about .about-ages {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.page-about .about-age {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: .04em;
  padding: 8px 14px;
  color: var(--ink);
  border: 2px solid var(--ink);
  background: var(--half);
}
.page-about .about-age:nth-child(even) {
  background: rgba(53, 240, 208, .28);
}
.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 2px solid var(--ink);
}
.page-about .about-stat {
  padding: 20px 0 22px;
  border-bottom: 1px solid rgba(16, 20, 24, .18);
}
.page-about .about-stat:nth-child(odd) {
  padding-right: 16px;
  border-right: 1px solid rgba(16, 20, 24, .18);
}
.page-about .about-stat:nth-child(even) {
  padding-left: 16px;
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}
.page-about .about-stat--coral .about-stat__num {
  color: #C63A18;
}
.page-about .about-stat__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(16, 20, 24, .6);
  margin-left: 5px;
}
.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(16, 20, 24, .66);
}

/* ---------- 使用场景 tabs ---------- */
.page-about .about-tabs {
  border-top: 2px solid var(--hairline-strong);
}
.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--hairline);
}
.page-about .about-tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 14px 4px;
  margin-right: 26px;
  font-family: var(--font-body);
  font-size: clamp(13px, 1.5vw, 15px);
  font-weight: 600;
  color: rgba(244, 241, 234, .5);
  cursor: pointer;
  transition: color .16s ease, border-color .16s ease;
}
.page-about .about-tab:hover {
  color: var(--paper);
}
.page-about .about-tab.is-active,
.page-about .about-tab[aria-selected="true"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .about-tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .about-panel {
  padding: clamp(24px, 4vw, 40px) 0 0;
  max-width: 760px;
}
.page-about .about-panel__t {
  margin: 0 0 14px;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}
.page-about .about-panel__p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 241, 234, .74);
  max-width: 38em;
}
.page-about .about-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-panel__list li {
  position: relative;
  padding: 10px 0 10px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, .78);
  border-top: 1px solid var(--hairline-soft);
}
.page-about .about-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 工作准则 ---------- */
.page-about .about-principles {
  background:
    linear-gradient(180deg, rgba(5, 9, 15, .5) 0%, rgba(5, 9, 15, .88) 100%);
  border-top: 1px solid var(--hairline-soft);
}
.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--hairline-strong);
}
.page-about .about-principle {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--hairline);
  transition: background-color .18s ease;
}
.page-about .about-principle:hover {
  background: rgba(53, 240, 208, .045);
}
.page-about .about-principle__idx {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--coral);
  padding-top: 2px;
}
.page-about .about-principle__t {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-principle__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 234, .7);
  max-width: 40em;
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: clamp(32px, 5vw, 52px);
  padding: clamp(24px, 4vw, 36px);
  border: 2px solid var(--hairline-strong);
  background: rgba(53, 240, 208, .05);
  box-shadow: 10px 10px 0 var(--carbon);
}
.page-about .about-cta__text {
  margin: 0;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.7;
  font-weight: 600;
  color: var(--paper);
  max-width: 34em;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 按钮基础（页面内兜底） ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
}
.page-about .btn--cyan {
  background: var(--cyan);
  color: var(--carbon);
  border-color: var(--cyan);
}
.page-about .btn--cyan:hover {
  background: transparent;
  color: var(--cyan);
}
.page-about .btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--hairline-strong);
}
.page-about .btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .5s ease, transform .5s ease;
  }
  .page-about [data-reveal].is-in {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 断点：平板以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-hero__facts .kpi {
    padding-right: 20px;
    border-right: 1px solid var(--hairline);
  }
  .page-about .about-hero__facts .kpi:last-child {
    border-right: 0;
    padding-right: 0;
  }
  .page-about .about-roles__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
  .page-about .about-role--offset {
    margin-top: 34px;
  }
  .page-about .about-role--accent {
    margin-top: 68px;
  }
  .page-about .about-flow__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }
  .page-about .about-flow__media {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .about-partners__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
  .page-about .about-coverage__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-node__sum {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(40px, 5vw, 64px);
    align-items: end;
  }
  .page-about .about-hero__media {
    margin-bottom: 6px;
  }
  .page-about .about-history__media {
    max-width: 100%;
  }
  .page-about .about-principle {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 20px;
  }
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 480px) {
  .page-about .about-tablist {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about .about-tab {
    margin-right: 0;
    text-align: left;
    border-bottom: 1px solid var(--hairline);
    padding: 13px 2px;
  }
  .page-about .about-tab.is-active,
  .page-about .about-tab[aria-selected="true"] {
    border-bottom-color: var(--cyan);
  }
  .page-about .about-flow__step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
  }
  .page-about .about-principle {
    grid-template-columns: 34px minmax(0, 1fr);
  }
  .page-about .about-coverage__stats {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-stat:nth-child(odd) {
    padding-right: 0;
    border-right: 0;
  }
  .page-about .about-stat:nth-child(even) {
    padding-left: 0;
  }
  .page-about .about-timeline {
    padding-left: 18px;
  }
  .page-about .about-node__dot {
    left: -26px;
    width: 10px;
    height: 10px;
  }
  .page-about .about-node__sum:hover::before {
    left: -22px;
  }
}