.page-about {
  --about-rail-w: 96px;
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 28px) 0 clamp(44px, 6vw, 68px);
  background:
    radial-gradient(110% 86% at 82% 4%, rgba(217, 162, 74, .14), rgba(7, 11, 24, 0) 58%),
    radial-gradient(90% 78% at 6% 96%, rgba(63, 224, 208, .10), rgba(7, 11, 24, 0) 62%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 43, 77, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 43, 77, .55) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .92), rgba(0, 0, 0, 0) 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .92), rgba(0, 0, 0, 0) 88%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(22px, 4vw, 46px);
  border-radius: var(--radius-sm);
  background: linear-gradient(158deg, rgba(14, 23, 48, .82), rgba(7, 11, 24, .54));
}

.page-about .about-hero .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  max-width: 22ch;
  font-size: clamp(26px, 5.2vw, 50px);
  line-height: 1.16;
  letter-spacing: -.012em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero .lede {
  max-width: 64ch;
  font-size: clamp(16px, 1.6vw, 17.5px);
  line-height: 1.78;
  color: var(--warm);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 20px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stat {
  min-width: 0;
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1;
  letter-spacing: .02em;
  white-space: nowrap;
  color: var(--gold-hi);
  background: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 9px;
  font-size: 14px;
  line-height: 1.62;
  color: var(--warm);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .section {
  position: relative;
  padding-top: clamp(46px, 7vw, 80px);
  padding-bottom: clamp(46px, 7vw, 80px);
}

.page-about .section::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: 1px;
  background: linear-gradient(90deg, rgba(217, 162, 74, 0), rgba(217, 162, 74, .32) 18%, rgba(217, 162, 74, .32) 82%, rgba(217, 162, 74, 0));
}

.page-about .section__head {
  max-width: 72ch;
}

.page-about .section__head .lede {
  margin-top: 12px;
  color: var(--warm);
  line-height: 1.78;
}

/* 阶段快捷索引 */
.page-about .about-stage-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(24px, 3.4vw, 38px) 0 clamp(28px, 4vw, 46px);
}

/* 阶段区：左轴 + 右列 */
.page-about .stages-layout {
  display: grid;
  gap: 26px;
}

.page-about .stages-rail {
  display: none;
}

.page-about .stages-list {
  display: grid;
  gap: clamp(36px, 5vw, 62px);
  min-width: 0;
}

.page-about .stage {
  position: relative;
  padding-top: 26px;
  min-width: 0;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 18%;
  height: 1px;
  background: linear-gradient(90deg, rgba(217, 162, 74, .88), rgba(217, 162, 74, .2) 56%, rgba(30, 43, 77, 0) 100%);
}

.page-about .stage__head {
  margin-bottom: 16px;
}

.page-about .stage__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .stage__index {
  display: inline-block;
  padding: 3px 11px;
  border: 1px solid rgba(217, 162, 74, .42);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .stage__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--warm);
  white-space: nowrap;
}

.page-about .stage__title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 27px);
  line-height: 1.34;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .stage__body {
  display: grid;
  gap: 22px;
}

.page-about .stage__text {
  min-width: 0;
}

.page-about .stage__text p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--warm);
  overflow-wrap: break-word;
}

.page-about .stage__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--warm);
}

.page-about .stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

.page-about .stage__media,
.page-about .about-team__media {
  margin: 0;
  aspect-ratio: auto;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* 团队 */
.page-about .about-team__layout {
  display: grid;
  gap: 30px;
  margin-top: clamp(26px, 3.6vw, 42px);
}

.page-about .about-team__roles {
  display: grid;
  gap: 0;
  min-width: 0;
}

.page-about .role {
  display: grid;
  gap: 6px;
  padding: 20px 0 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .role:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .role__name {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .role__text p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.74;
  color: var(--warm);
}

/* 合作生态 */
.page-about .about-partners__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-partners__count {
  margin: 10px 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 62px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold-hi);
  white-space: nowrap;
}

.page-about .about-partners__lead h2 {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.8vw, 30px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-partners__text {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .qa {
  border-top: 1px solid var(--line-soft);
  padding: 15px 0;
}

.page-about .qa:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .qa summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

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

.page-about .qa summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .qa[open] summary::after {
  content: "–";
}

.page-about .qa summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .qa p {
  margin: 11px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--warm);
}

/* 运营与备案 */
.page-about .credential-panel {
  display: grid;
  gap: 28px;
  padding: clamp(24px, 4vw, 42px);
  border-top: 1px solid rgba(217, 162, 74, .44);
  border-radius: var(--radius-sm);
  background: linear-gradient(152deg, rgba(14, 23, 48, .94), rgba(11, 18, 36, .7));
}

.page-about .credential-panel__main h2 {
  margin: 10px 0 14px;
  font-size: clamp(20px, 2.8vw, 30px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .credential-panel__main p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .credential-panel__main .kw {
  color: var(--paper);
}

.page-about .credential-list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .credential-list > div {
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .credential-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .credential-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.66;
  color: var(--paper);
  overflow-wrap: break-word;
}

/* 数字一览 */
.page-about .figures {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .figure-item {
  padding: 22px 0 24px;
  border-top: 1px solid var(--line-soft);
  min-width: 0;
}

.page-about .figure-item__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .figure-item__value .num {
  color: var(--gold-hi);
}

.page-about .figure-item__label {
  margin: 11px 0 0;
  max-width: 28ch;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--warm);
}

/* 尾部行动 */
.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  padding: clamp(26px, 4vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(84% 124% at 90% 0%, rgba(63, 224, 208, .14), rgba(7, 11, 24, 0) 62%),
    linear-gradient(140deg, rgba(14, 23, 48, .95), rgba(11, 18, 36, .72));
}

.page-about .about-cta__copy h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--warm);
}

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

@media (min-width: 620px) {
  .page-about .figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 780px) {
  .page-about .stage--split .stage__body {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
    gap: 32px;
  }
}

@media (min-width: 820px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 38px;
  }
}

@media (min-width: 880px) {
  .page-about .credential-panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 46px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: 46px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 50px;
  }
}

@media (min-width: 1000px) {
  .page-about .stages-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .stages-rail {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h-scrolled) + 56px);
    height: 460px;
    padding-left: 26px;
  }

  .page-about .stages-rail::before {
    content: "";
    position: absolute;
    left: 13px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(180deg, rgba(217, 162, 74, .06), rgba(217, 162, 74, .55) 18%, rgba(217, 162, 74, .55) 82%, rgba(217, 162, 74, .06));
  }

  .page-about .stages-rail__tick {
    position: relative;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .18em;
    color: var(--warm);
    white-space: nowrap;
  }

  .page-about .stages-rail__tick::before {
    content: "";
    position: absolute;
    left: -26px;
    top: 50%;
    width: 26px;
    height: 1px;
    background: rgba(217, 162, 74, .7);
    transform: translateY(-50%);
  }

  .page-about .figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 34px;
  }
}