.page-about {
  --about-panel: rgba(20, 48, 74, .72);
  --about-line-soft: rgba(143, 163, 181, .18);
  --about-muted: #4a5866;
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(36px, 6vw, 78px) clamp(46px, 7vw, 96px);
  background:
    radial-gradient(126% 96% at 84% 2%, rgba(22, 224, 200, .18), transparent 58%),
    radial-gradient(90% 70% at 6% 96%, rgba(122, 92, 255, .16), transparent 62%),
    linear-gradient(170deg, var(--ink-deep), var(--ink) 52%, var(--ink-2) 100%);
}

.page-about .about-hero__cut {
  position: absolute;
  top: -20%;
  right: -16%;
  z-index: -1;
  width: min(780px, 84vw);
  height: min(560px, 66vw);
  border-radius: var(--r-xl);
  transform: rotate(-12deg);
  background: linear-gradient(142deg, rgba(22, 224, 200, .22), rgba(122, 92, 255, .24) 54%, rgba(242, 179, 61, .12) 82%, transparent);
  pointer-events: none;
}

.page-about .about-hero__arc {
  position: absolute;
  left: -18%;
  bottom: -34%;
  z-index: -1;
  width: min(900px, 100vw);
  height: min(900px, 100vw);
  border-radius: 50%;
  border: 1px solid rgba(22, 224, 200, .16);
  box-shadow: inset 0 0 0 60px rgba(22, 224, 200, .03);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .breadcrumbs {
  margin: 0 0 clamp(18px, 3vw, 28px);
}

.page-about .breadcrumbs__list {
  color: var(--haze);
}

.page-about .breadcrumbs__list a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 224, 200, .35);
}

.page-about .about-hero__tag {
  display: inline-block;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 15em;
  line-height: 1.06;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 15px 18px;
  background: var(--about-panel);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.25rem, 2.8vw, 1.85rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--aqua);
  letter-spacing: -0.01em;
}

.page-about .about-hero__facts li > span:last-child {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--haze);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(34px, 5vw, 60px);
  padding-block: clamp(48px, 7vw, 96px) clamp(60px, 9vw, 120px);
}

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

.page-about .chapter {
  position: relative;
  margin-top: clamp(48px, 7vw, 92px);
}

.page-about .chapter:first-child {
  margin-top: 0;
}

.page-about .chapter--light {
  background: var(--mist);
  color: var(--graphite);
  border-radius: var(--r-xl);
  padding: clamp(24px, 3.6vw, 46px);
  box-shadow: 0 26px 64px rgba(3, 12, 22, .42);
}

.page-about .chapter__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .76rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--aqua);
}

.page-about .chapter__title {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.018em;
  line-height: 1.14;
  color: var(--text);
}

.page-about .chapter__lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--text-soft);
}

.page-about .chapter--light .chapter__kicker {
  color: #0a8f80;
}

.page-about .chapter--light .chapter__title {
  color: var(--ink);
}

.page-about .chapter--light .chapter__lede {
  color: var(--about-muted);
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-2);
  aspect-ratio: 14 / 9;
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
}

.page-about .figure__caption {
  margin-top: 10px;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--haze);
}

.page-about .chapter--light .figure__caption {
  color: #6b7b89;
}

.page-about .chapter__figure {
  margin-bottom: clamp(26px, 3.6vw, 40px);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 26px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--aqua), var(--violet) 58%, var(--sand));
  opacity: .7;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 42px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  z-index: 1;
  width: 20px;
  height: 20px;
  border-radius: var(--r-pill);
  background: var(--ink);
  border: 3px solid var(--aqua);
  box-shadow: 0 0 0 5px rgba(22, 224, 200, .10);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  border-color: var(--sand);
  box-shadow: 0 0 0 8px rgba(242, 179, 61, .16);
}

.page-about .timeline__badge {
  display: inline-flex;
  align-items: center;
  margin-bottom: 10px;
  padding: 5px 13px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(22, 224, 200, .32);
  background: rgba(22, 224, 200, .12);
  color: var(--aqua);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .78rem;
  letter-spacing: .08em;
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 32em;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .timeline__more {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .36s var(--ease), opacity .3s var(--ease), margin-top .36s var(--ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more {
  max-height: 8rem;
  opacity: 1;
  margin-top: 12px;
}

.page-about .timeline__more span {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .78rem;
  color: var(--sand);
  border-bottom: 1px dashed rgba(242, 179, 61, .42);
  padding-bottom: 2px;
}

@media (hover: none) {
  .page-about .timeline__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

/* ---------- 通用分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
  min-width: 0;
}

.page-about .archive-figure,
.page-about .future-figure {
  min-width: 0;
}

/* ---------- 档案清单 ---------- */
.page-about .archive-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .archive-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 15px 18px;
  border-radius: var(--r-md);
  border-left: 3px solid var(--aqua);
  background: rgba(11, 27, 42, .055);
}

.page-about .archive-list__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .82rem;
  font-weight: 700;
  line-height: 1.5;
  color: #0a8f80;
}

.page-about .archive-list h3 {
  margin: 0 0 5px;
  font-size: .98rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .archive-list p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .archive-note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 16px 20px;
  border-radius: var(--r-md);
  border-left: 3px solid var(--sand);
  background: rgba(242, 179, 61, .12);
  font-size: .92rem;
  line-height: 1.8;
  color: #3c4854;
}

/* ---------- 团队环形图 ---------- */
.page-about .donut {
  margin: 0;
  min-width: 0;
}

.page-about .donut svg {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin-inline: auto;
}

.page-about .donut__ring {
  transition: stroke-width .3s var(--ease), opacity .3s var(--ease);
}

.page-about .donut:hover .donut__ring {
  stroke-width: 19;
}

.page-about .donut__value {
  fill: var(--text);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
}

.page-about .donut__unit {
  fill: var(--haze);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: .1em;
}

.page-about .donut__legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .78rem;
  color: var(--text-soft);
}

.page-about .donut__key {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .donut__key::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: currentColor;
}

.page-about .donut__key--verify {
  color: var(--aqua);
}

.page-about .donut__key--eng {
  color: var(--violet);
}

.page-about .donut__key--edit {
  color: var(--sand);
}

.page-about .donut__key--verify,
.page-about .donut__key--eng,
.page-about .donut__key--edit {
  filter: saturate(1.05);
}

/* ---------- 核验说明 ---------- */
.page-about .verify-notes {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .verify-note {
  padding: 16px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line-soft);
  background: var(--about-panel);
}

.page-about .verify-note h3 {
  margin: 0 0 7px;
  font-size: .98rem;
  font-weight: 700;
  color: var(--aqua);
  letter-spacing: .01em;
}

.page-about .verify-note p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 合作卡片 ---------- */
.page-about .partner-cards {
  display: grid;
  gap: clamp(14px, 2.2vw, 20px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .partner-card {
  position: relative;
  padding: 20px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line-soft);
  background:
    linear-gradient(160deg, rgba(22, 224, 200, .09), transparent 62%),
    var(--about-panel);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .partner-card:nth-child(2) {
  background:
    linear-gradient(160deg, rgba(122, 92, 255, .13), transparent 62%),
    var(--about-panel);
}

.page-about .partner-card:nth-child(3) {
  background:
    linear-gradient(160deg, rgba(242, 179, 61, .13), transparent 62%),
    var(--about-panel);
}

.page-about .partner-card:nth-child(4) {
  background:
    linear-gradient(160deg, rgba(47, 163, 107, .13), transparent 62%),
    var(--about-panel);
}

.page-about .partner-card:hover {
  transform: translateY(-4px);
  border-color: rgba(22, 224, 200, .38);
}

.page-about .partner-card__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--sand);
  letter-spacing: -0.01em;
}

.page-about .partner-card h3 {
  margin: 6px 0 8px;
  font-size: .96rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .partner-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: var(--text-soft);
}

.page-about .section-link {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .section-link a {
  display: inline-block;
  font-size: .9rem;
  font-weight: 600;
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 224, 200, .4);
  padding-bottom: 2px;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .section-link a:hover {
  color: var(--sand);
  border-color: rgba(242, 179, 61, .6);
}

/* ---------- 长期方向 ---------- */
.page-about .future-list {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .future-item {
  padding: 16px 20px;
  border-radius: var(--r-md);
  background: rgba(11, 27, 42, .055);
  border-left: 3px solid var(--violet);
}

.page-about .future-item:nth-child(2) {
  border-left-color: var(--aqua);
}

.page-about .future-item:nth-child(3) {
  border-left-color: var(--palm);
}

.page-about .future-item h3 {
  margin: 0 0 6px;
  font-size: .98rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .future-item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: var(--about-muted);
}

.page-about .future-cta {
  margin-top: clamp(24px, 3.4vw, 34px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid rgba(11, 27, 42, .12);
  display: grid;
  gap: 16px;
}

.page-about .future-cta p {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

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

/* ---------- 侧栏 ---------- */
.page-about .about-side {
  min-width: 0;
}

.page-about .about-side__stack {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line-soft);
  background:
    linear-gradient(180deg, rgba(22, 224, 200, .07), transparent 46%),
    var(--ink-2);
}

.page-about .about-side__title {
  margin: 0;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .side-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .side-card {
  padding: 13px 15px;
  border-radius: var(--r-sm);
  background: rgba(11, 27, 42, .5);
  border-left: 3px solid var(--aqua);
}

.page-about .side-card:nth-child(2) {
  border-left-color: var(--violet);
}

.page-about .side-card:nth-child(3) {
  border-left-color: var(--sand);
}

.page-about .side-card:nth-child(4) {
  border-left-color: var(--palm);
}

.page-about .side-card__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--aqua);
}

.page-about .side-card__label {
  display: block;
  margin-top: 2px;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .side-card__note {
  margin: 6px 0 0;
  font-size: .78rem;
  line-height: 1.66;
  color: var(--haze);
}

.page-about .about-side__cta {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

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

  .page-about .future-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 7fr) minmax(260px, 3fr);
    align-items: start;
    gap: clamp(36px, 4.5vw, 64px);
  }

  .page-about .about-side__stack {
    position: sticky;
    top: calc(var(--frame-top) + 24px);
  }
}

@media (min-width: 1180px) {
  .page-about .partner-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item::before,
  .page-about .timeline__more,
  .page-about .partner-card,
  .page-about .section-link a,
  .page-about .donut__ring {
    transition: none;
  }

  .page-about .partner-card:hover {
    transform: none;
  }
}