.page-about {
  --about-narrow: 260px;
  --about-wide: 720px;
  --about-stage-gap: 40px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero__copy .lead {
  margin-top: 20px;
  max-width: 52ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    radial-gradient(circle at 82% 18%, rgba(124, 92, 255, .28), transparent 58%),
    radial-gradient(circle at 12% 88%, rgba(43, 232, 201, .18), transparent 60%),
    var(--panel);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  mix-blend-mode: screen;
  opacity: .92;
}

/* ---------- 我们是谁 ---------- */
.page-about .about-who__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-who__main p {
  max-width: var(--about-wide);
  margin-top: 18px;
  color: var(--ink);
}

.page-about .about-who__main p:first-of-type {
  margin-top: 24px;
}

.page-about .about-who__aside {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
}

.page-about .about-factlet {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-factlet__num {
  font-size: 32px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-factlet__label {
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-who__note {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-groups {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-group {
  position: relative;
  padding: 26px 24px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(14, 23, 48, .96), rgba(6, 10, 24, .96));
  transition: border-color .35s var(--ease), transform .35s var(--ease);
}

.page-about .about-group:hover {
  border-color: rgba(43, 232, 201, .55);
  transform: translateY(-3px);
}

.page-about .about-group__code {
  display: inline-block;
  margin-bottom: 14px;
  padding: 2px 10px;
  border-radius: var(--pill);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--violet);
  border: 1px solid rgba(124, 92, 255, .45);
  background: rgba(124, 92, 255, .1);
}

.page-about .about-group h3 {
  margin: 0 0 8px;
}

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

/* ---------- 更新流程 ---------- */
.page-about .about-batches {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-batch {
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  border-left: 3px solid var(--cyan);
}

.page-about .about-batch__time {
  display: inline-block;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .about-batch h3 {
  margin: 10px 0 8px;
}

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

.page-about .about-proof {
  margin-top: 32px;
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px dashed rgba(255, 138, 60, .45);
  background: linear-gradient(120deg, rgba(255, 138, 60, .08), rgba(124, 92, 255, .08));
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-proof__text {
  margin: 0;
  max-width: var(--about-wide);
  font-size: 16px;
  line-height: 1.85;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-team__intro p {
  margin-top: 20px;
  max-width: var(--about-wide);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-role {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-role__num {
  display: block;
  font-size: 40px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-role h3 {
  margin: 12px 0 8px;
}

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

/* ---------- 发展历程 ---------- */
.page-about .about-history__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-index {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: rgba(14, 23, 48, .7);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .3s var(--ease), color .3s var(--ease);
}

.page-about .about-index__link .mono {
  color: var(--violet);
  font-size: 12px;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-index__link:hover .mono,
.page-about .about-index__link:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-history__media {
  margin: 0 0 36px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(124, 92, 255, .22), rgba(43, 232, 201, .12)),
    var(--panel);
}

.page-about .about-history__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  mix-blend-mode: screen;
  opacity: .9;
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 2px solid var(--line);
}

.page-about .about-stage {
  position: relative;
  padding-bottom: var(--about-stage-gap);
}

.page-about .about-stage:last-child {
  padding-bottom: 0;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(43, 232, 201, .12);
  animation: about-pulse 2.4s ease-in-out infinite;
}

.page-about .about-stage__tag {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--violet);
}

.page-about .about-stage h3 {
  margin: 0 0 10px;
}

.page-about .about-stage p {
  margin: 0;
  max-width: var(--about-wide);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 6px rgba(43, 232, 201, .12); }
  50% { box-shadow: 0 0 0 11px rgba(43, 232, 201, .04); }
}

/* ---------- 用户 ---------- */
.page-about .about-users__grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-user {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-user h3 {
  margin: 0;
}

.page-about .about-user p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-partners__copy p {
  margin-top: 18px;
  max-width: var(--about-wide);
}

.page-about .about-partners__copy .btn {
  margin-top: 26px;
}

.page-about .about-partners__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 50%, rgba(43, 232, 201, .16), transparent 62%),
    radial-gradient(circle at 88% 12%, rgba(255, 138, 60, .18), transparent 58%),
    var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-partners__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .92;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding: clamp(28px, 5vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    linear-gradient(140deg, rgba(124, 92, 255, .16), rgba(43, 232, 201, .08) 55%, rgba(255, 138, 60, .1)),
    var(--panel);
}

.page-about .about-next__copy p {
  margin: 16px 0 0;
  max-width: 60ch;
  color: var(--muted);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-proof {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-who__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-history__grid {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: start;
  }

  .page-about .about-history__index {
    position: sticky;
    top: 140px;
  }

  .page-about .about-index {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }

  .page-about .about-index__link {
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    background: transparent;
    padding: 8px 12px;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: rgba(14, 23, 48, .8);
    border-color: var(--line);
  }

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

  .page-about .about-stages {
    padding-left: 34px;
  }

  .page-about .about-stage::before {
    left: -42px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-who__aside {
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-group,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-stage::before {
    animation: none;
  }
}