.page-about {
  --pa-soft: #4f4663;
  --pa-line: #d6cdbc;
  --pa-stroke: rgba(34, 230, 255, 0.24);
  background: var(--ink-950);
  color: var(--text-hi);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about :is(p, li, dd) {
  font-size: 16px;
  line-height: 1.85;
}

.page-about .mono {
  font-family: var(--font-mono);
}

/* 面包屑 */
.page-about .pa-crumbs {
  padding-top: 22px;
}

.page-about .pa-crumbs .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-mid);
}

.page-about .pa-crumbs .breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 10px;
  color: var(--violet-300);
}

.page-about .pa-crumbs a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.12s var(--ease), color 0.12s var(--ease);
}

.page-about .pa-crumbs a:hover {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* 首屏 */
.page-about .pa-hero {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(48px, 7vw, 84px);
}

.page-about .pa-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
  text-transform: uppercase;
}

.page-about .pa-hero-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--text-hi);
  text-shadow: 3px 3px 0 rgba(123, 43, 255, 0.55);
}

.page-about .pa-lede {
  margin: 0;
  max-width: 58ch;
  color: var(--text-mid);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .pa-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pa-hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--pa-stroke);
  border-radius: 999px;
  background: var(--ink-900);
}

.page-about .pa-hero-facts span {
  font-size: 13px;
  font-weight: 700;
  color: var(--orange-500);
  letter-spacing: 0.04em;
}

.page-about .pa-hero-facts em {
  font-style: normal;
  font-size: 12px;
  color: var(--text-mid);
}

.page-about .pa-hero-figure {
  margin: 0;
  border: 1px solid var(--cyan-400);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 0 26px rgba(34, 230, 255, 0.16);
  background: var(--ink-900);
}

.page-about .pa-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .pa-hero-figure figcaption {
  padding: 10px 16px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-mid);
  border-top: 1px solid rgba(34, 230, 255, 0.18);
}

/* 暖纸插页 */
.page-about .pa-sheet {
  position: relative;
  background: var(--paper-100);
  color: var(--ink-900);
  padding: clamp(34px, 6vw, 72px) 0 clamp(40px, 6vw, 78px);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.page-about .pa-sheet::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--violet-500), var(--cyan-400) 42%, var(--magenta-500) 72%, var(--orange-500));
}

.page-about .pa-sheet-inner {
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(24px, 4vw, 44px);
}

.page-about .pa-sheet-inner + .pa-sheet-inner {
  border-top: 1px solid var(--pa-line);
}

.page-about .pa-eyebrow-ink {
  color: var(--violet-500);
}

.page-about .pa-h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .pa-sheet .pa-h2 {
  color: var(--ink-900);
}

.page-about .pa-sheet p {
  margin: 0 0 16px;
  color: var(--pa-soft);
  max-width: 62ch;
}

.page-about .pa-split {
  display: grid;
  gap: 28px;
}

.page-about .pa-aside {
  border-left: 3px solid var(--violet-500);
  padding: 4px 0 4px 18px;
}

.page-about .pa-aside-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--violet-500);
}

.page-about .pa-aside-list {
  display: grid;
  gap: 16px;
  margin: 0;
}

.page-about .pa-aside-list dt {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: 0.03em;
}

.page-about .pa-aside-list dd {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--pa-soft);
}

/* 时间线 */
.page-about .pa-timeline {
  position: relative;
  margin: 0 0 8px;
  padding: 0;
  list-style: none;
}

.page-about .pa-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 11px;
  width: 2px;
  background: linear-gradient(180deg, var(--violet-500), var(--cyan-400));
}

.page-about .pa-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding-left: 40px;
  margin-bottom: 26px;
  outline: none;
}

.page-about .pa-node:last-child {
  margin-bottom: 0;
}

.page-about .pa-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 2px solid var(--violet-500);
  box-shadow: 0 0 10px rgba(123, 43, 255, 0.35);
  transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .pa-node:last-child::before {
  border-color: var(--orange-500);
  box-shadow: 0 0 12px rgba(255, 122, 26, 0.45);
}

.page-about .pa-node:hover::before,
.page-about .pa-node:focus::before {
  border-color: var(--orange-500);
  box-shadow: 0 0 14px rgba(255, 122, 26, 0.5);
}

.page-about .pa-year {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-900);
  line-height: 1;
}

.page-about .pa-node-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .pa-node-body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--pa-soft);
}

.page-about .pa-node-extra {
  display: block;
  padding-top: 8px;
  border-top: 1px dashed var(--pa-line);
  font-size: 14px;
  color: #6a5f80;
}

.page-about .pa-timeline-figure {
  margin: 32px 0 0;
  border: 1px solid rgba(123, 43, 255, 0.35);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .pa-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-about .pa-timeline-figure figcaption {
  padding: 10px 16px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-mid);
  border-top: 1px solid rgba(34, 230, 255, 0.16);
}

/* 通用深色区块 */
.page-about .pa-block {
  padding: clamp(46px, 7vw, 84px) 0;
}

.page-about .pa-h2-dark {
  color: var(--text-hi);
}

.page-about .pa-body {
  margin: 0 0 24px;
  max-width: 66ch;
  color: var(--text-mid);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .pa-body-tight {
  margin-top: 22px;
  margin-bottom: 0;
}

/* 团队 */
.page-about .pa-team {
  display: grid;
  gap: 16px;
}

.page-about .pa-team-item {
  padding: 24px 22px;
  border: 1px solid var(--pa-stroke);
  border-radius: var(--radius-md);
  background: var(--ink-900);
  transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .pa-team-item:hover {
  border-color: var(--orange-500);
  box-shadow: 0 0 22px rgba(255, 122, 26, 0.16);
}

.page-about .pa-team-num {
  display: block;
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: 0.02em;
}

.page-about .pa-team-role {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--text-hi);
}

.page-about .pa-team-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-mid);
}

/* 标签 */
.page-about .pa-tags-grid {
  display: grid;
  gap: 30px;
}

.page-about .pa-tag-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .pa-tag-item {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--violet-500);
  background: var(--ink-800);
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .pa-tag-item:hover {
  border-left-color: var(--orange-500);
  transform: translateX(2px);
}

.page-about .pa-tag-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .pa-tag-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-mid);
}

.page-about .pa-tag-figure {
  margin: 0;
  align-self: start;
  border: 1px solid var(--cyan-400);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-900);
  box-shadow: 0 0 22px rgba(34, 230, 255, 0.14);
}

.page-about .pa-tag-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .pa-tag-figure figcaption {
  padding: 10px 14px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-mid);
  border-top: 1px solid rgba(34, 230, 255, 0.16);
}

/* 指标 */
.page-about .pa-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .pa-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--pa-stroke);
  background: var(--ink-800);
}

.page-about .pa-stat-num {
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
  letter-spacing: 0.02em;
}

.page-about .pa-stat-label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-mid);
}

/* 合作 */
.page-about .pa-partner-grid {
  display: grid;
  gap: 26px;
  align-items: stretch;
}

.page-about .pa-partner-figure {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, rgba(123, 43, 255, 0.28), rgba(34, 230, 255, 0.12));
  border: 1px solid rgba(34, 230, 255, 0.3);
}

.page-about .pa-partner-quote {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 900;
  line-height: 1.4;
  color: var(--text-hi);
  letter-spacing: -0.01em;
}

.page-about .pa-partner-sub {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-mid);
}

/* 结尾 */
.page-about .pa-cta {
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .pa-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.page-about .pa-cta-row .btn {
  text-decoration: none;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .pa-hero-grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: center;
  }

  .page-about .pa-team {
    grid-template-columns: 1.15fr 1fr 0.85fr;
  }

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

  .page-about .pa-tags-grid {
    grid-template-columns: 1.3fr 0.7fr;
    gap: 40px;
  }

  .page-about .pa-partner-grid {
    grid-template-columns: 1.25fr 0.75fr;
  }
}

@media (min-width: 860px) {
  .page-about .pa-split {
    grid-template-columns: 1.6fr 0.7fr;
    gap: 48px;
  }

  .page-about .pa-timeline::before {
    left: 139px;
  }

  .page-about .pa-node {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 36px;
    padding-left: 0;
    margin-bottom: 24px;
  }

  .page-about .pa-node::before {
    left: 132px;
    top: 2px;
  }

  .page-about .pa-year {
    font-size: 1.85rem;
    text-align: right;
  }

  .page-about .pa-node-extra {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.26s var(--ease), opacity 0.26s var(--ease), padding-top 0.26s var(--ease);
  }

  .page-about .pa-node:hover .pa-node-extra,
  .page-about .pa-node:focus .pa-node-extra,
  .page-about .pa-node:focus-within .pa-node-extra {
    max-height: 200px;
    opacity: 1;
    padding-top: 10px;
    border-top-color: var(--pa-line);
  }
}

@media (min-width: 1040px) {
  .page-about .pa-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .pa-block {
    padding-left: 0;
    padding-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-node-extra,
  .page-about .pa-tag-item,
  .page-about .pa-team-item,
  .page-about .pa-node::before {
    transition: none;
  }

  .page-about .pa-tag-item:hover {
    transform: none;
  }
}