.page-about {
  --about-line: rgba(242, 169, 59, 0.26);
  --about-hair: rgba(245, 241, 232, 0.10);
  --about-year: clamp(1.9rem, 5vw, 3.2rem);
  background: var(--night);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(36px, 6vw, 68px);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -24%;
  width: min(780px, 94vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 42% 42%, rgba(242, 169, 59, 0.20), rgba(242, 169, 59, 0) 68%);
  pointer-events: none;
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  bottom: -22%;
  left: -14%;
  width: min(520px, 70vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(56, 225, 208, 0.10), rgba(56, 225, 208, 0) 70%);
  pointer-events: none;
}

.page-about .cover-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .cover-title {
  margin: 12px 0 0;
  max-width: 17ch;
  letter-spacing: -0.02em;
}

.page-about .cover-lede {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
}

.page-about .cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

.page-about .cover-card {
  padding: clamp(20px, 3vw, 28px);
  align-self: end;
  border: 1px solid var(--about-line);
}

.page-about .cover-facts {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .cover-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .cover-facts li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .cover-fact-num {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  color: var(--gold);
  line-height: 1;
}

.page-about .cover-fact-label {
  color: var(--silver);
  font-size: 0.84rem;
  line-height: 1.5;
}

.page-about .cover-scale-wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-scale {
  display: block;
  width: 100%;
  height: auto;
  margin-top: clamp(32px, 6vw, 58px);
  opacity: 0.92;
}

/* ---------- 起点 ---------- */
.page-about .origin-grid {
  margin-top: clamp(24px, 4vw, 42px);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .origin-figure {
  aspect-ratio: 4 / 3;
}

.page-about .origin-figure img,
.page-about .team-figure img,
.page-about .next-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .tl-item {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--about-line);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 169, 59, 0.09);
}

.page-about .tl-year .num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--about-year);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .tl-title {
  margin: 6px 0 0;
  font-size: clamp(1.08rem, 2.2vw, 1.42rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .tl-sum {
  margin: 10px 0 0;
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--silver);
  max-width: 62ch;
}

.page-about .expand-group {
  margin-top: 6px;
}

.page-about .expand-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  max-width: 62ch;
  padding: 11px 0;
  background: none;
  border: 0;
  border-top: 1px solid var(--about-hair);
  color: var(--gold-lift);
  font: inherit;
  font-size: 0.84rem;
  letter-spacing: 0.03em;
  text-align: left;
  cursor: pointer;
  transition: color 240ms var(--ease);
}

.page-about .expand-trigger:hover {
  color: var(--gold);
}

.page-about .expand-sign {
  flex: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--gold);
  transition: transform 240ms var(--ease);
}

.page-about .expand-trigger[aria-expanded="true"] .expand-sign {
  transform: rotate(45deg);
}

.page-about .expand-panel {
  padding: 4px 0 14px;
  max-width: 62ch;
  color: var(--silver);
}

.page-about .expand-panel[hidden] {
  display: none;
}

.page-about .expand-panel p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ---------- 数据带 ---------- */
.page-about .data-band {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(22px, 3.4vw, 38px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-hair);
  background: linear-gradient(118deg, rgba(242, 169, 59, 0.14), rgba(56, 225, 208, 0.06) 58%, rgba(7, 9, 12, 0) 100%);
}

.page-about .data-band .stat {
  display: grid;
  gap: 8px;
}

.page-about .data-band .stat-value {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  line-height: 1;
}

.page-about .data-band .stat-label {
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .data-copy {
  margin-top: clamp(26px, 4vw, 44px);
  gap: clamp(20px, 3vw, 40px);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  margin-top: clamp(26px, 4vw, 46px);
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .team-figure {
  aspect-ratio: 3 / 2;
}

.page-about .crew-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .crew-row {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr) 44px;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
}

.page-about .crew-name {
  color: var(--paper);
}

.page-about .crew-bar {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(245, 241, 232, 0.08);
  overflow: hidden;
}

.page-about .crew-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
}

.page-about .crew-fill--ops {
  width: 26%;
}

.page-about .crew-fill--dev {
  width: 49%;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold-lift));
}

.page-about .crew-fill--edit {
  width: 13%;
  background: linear-gradient(90deg, rgba(56, 225, 208, 0.35), var(--cyan));
}

.page-about .crew-fill--sup {
  width: 12%;
  background: linear-gradient(90deg, rgba(164, 107, 255, 0.35), var(--violet));
}

.page-about .crew-num {
  text-align: right;
  font-size: 1rem;
  color: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  margin-top: clamp(26px, 4vw, 46px);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .partner-lead p:first-child {
  margin-top: 0;
}

.page-about .partner-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .partner-row {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: clamp(16px, 3vw, 30px);
  align-items: baseline;
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .partner-row:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .partner-num {
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .partner-body h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .partner-body p {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  margin-top: clamp(26px, 4vw, 46px);
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .next-list li {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--gold-deep);
  background: var(--char-2);
}

.page-about .next-list h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .next-list p {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .next-figure {
  margin: clamp(28px, 5vw, 52px) 0 0;
  aspect-ratio: 3 / 2;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(48px, 8vw, 88px);
}

.page-about .cta-shell {
  border-top: 1px solid var(--about-line);
  padding-top: clamp(26px, 4vw, 44px);
}

.page-about .cta-shell .display-lg {
  max-width: 24ch;
  margin: 0;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .data-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .tl {
    position: relative;
  }

  .page-about .tl::before {
    content: "";
    position: absolute;
    left: 130px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, rgba(242, 169, 59, 0.52), rgba(242, 169, 59, 0.06));
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 40px;
    padding-left: 0;
    border-left: 0;
  }

  .page-about .tl-item::before {
    display: none;
  }

  .page-about .tl-year {
    padding-top: 4px;
    text-align: right;
  }
}

@media (min-width: 980px) {
  .page-about .cover-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 1080px) {
  .page-about .data-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .expand-trigger,
  .page-about .expand-sign {
    transition: none;
  }
}