.page-about {
  background: var(--c-void);
  color: var(--c-text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: 28px 0 56px;
  border-bottom: 1px solid var(--c-line);
  background:
    radial-gradient(760px 320px at 82% -10%, rgba(37, 227, 212, 0.12), transparent 70%),
    radial-gradient(520px 260px at 8% 110%, rgba(255, 122, 26, 0.08), transparent 72%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 20px;
}

.page-about .about-hero__main h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(2rem, 7.2vw, 4.25rem);
  margin: 10px 0 20px;
  color: var(--c-text);
}

.page-about .about-hero__main .lead {
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--c-sub);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-panel);
  padding: 22px 20px;
  position: relative;
  overflow: hidden;
}

.page-about .about-facts::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-std), rgba(37, 227, 212, 0));
}

.page-about .about-facts__title {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin: 0 0 16px;
}

.page-about .about-facts__list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-facts__row:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-facts__row dt {
  font-size: 0.8125rem;
  color: var(--c-muted);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1rem;
  color: var(--c-std);
  letter-spacing: -0.01em;
}

.page-about .about-facts__note {
  margin: 16px 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .about-section {
  padding: 52px 0 8px;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-row__index {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-row__no {
  font-size: 0.8125rem;
  color: var(--c-std);
  letter-spacing: 0.1em;
}

.page-about .about-row__rule {
  flex: 0 0 auto;
  width: 46px;
  height: 1px;
  background: var(--c-line);
}

.page-about .about-row__tag {
  font-size: 0.75rem;
  color: var(--c-muted);
  letter-spacing: 0.08em;
}

.page-about .about-row__body h2 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.18;
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  margin: 0 0 16px;
  color: var(--c-text);
}

.page-about .about-row__body h3 {
  font-size: 1.0625rem;
  line-height: 1.5;
  margin: 0 0 8px;
  color: var(--c-text);
}

.page-about .about-row__body .prose {
  max-width: 70ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-sub);
  margin: 0 0 18px;
}

.page-about .about-row__body .prose a {
  color: var(--c-std);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 227, 212, 0.45);
}

.page-about .about-row__body .prose a:hover {
  border-bottom-color: var(--c-std);
}

.page-about .about-svg {
  display: block;
  width: 100%;
  max-width: 620px;
  height: auto;
  margin: 6px 0 26px;
}

.page-about .about-svg__rail {
  stroke: var(--c-line);
  stroke-width: 1;
}

.page-about .about-svg__node {
  fill: var(--c-panel);
  stroke: var(--c-std);
  stroke-width: 1.5;
}

.page-about .about-svg__node--now {
  fill: var(--c-std);
  stroke: var(--c-std);
}

.page-about .about-svg__label {
  fill: var(--c-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-media {
  margin: 0 0 32px;
}

.page-about .about-media img {
  display: block;
}

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

.page-about .tl__item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 14px 18px 0;
  border-top: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  transition: background-color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-about .tl__item:first-child {
  border-top: none;
}

.page-about .tl__item:hover,
.page-about .tl__item:focus-within,
.page-about .tl__item:focus {
  background: var(--c-panel);
  outline: none;
}

.page-about .tl__item:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
}

.page-about .tl__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 6px;
}

.page-about .tl__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-panel);
  border: 1.5px solid var(--c-std);
  flex: 0 0 auto;
}

.page-about .tl__dot--now {
  width: 13px;
  height: 13px;
  background: var(--c-std);
  border-color: var(--c-std);
  box-shadow: 0 0 0 4px rgba(37, 227, 212, 0.14);
}

.page-about .tl__line {
  flex: 1 1 auto;
  width: 1px;
  background: var(--c-line);
  margin-top: 8px;
}

.page-about .tl__year {
  display: inline-block;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--c-std);
  margin: 0 0 6px;
}

.page-about .tl__item--now .tl__year {
  color: var(--c-beta);
}

.page-about .tl__body p {
  max-width: 70ch;
  margin: 0 0 10px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-sub);
}

.page-about .tl__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .tl__points li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .tl__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 1px;
  background: var(--c-line);
}

/* 用户场景 */
.page-about .usr-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .usr-card {
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-std);
  border-radius: var(--r-card);
  background: var(--c-panel);
  padding: 20px 18px;
  transition: background-color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-about .usr-card:hover {
  background: var(--c-lift);
  border-color: var(--c-focus);
}

.page-about .usr-card__tag {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-beta);
  margin: 0 0 10px;
}

.page-about .usr-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-sub);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .team-card {
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-panel);
  padding: 18px 16px;
  transition: background-color var(--t-fast) ease, transform var(--t-fast) ease;
}

.page-about .team-card:hover {
  background: var(--c-lift);
  transform: translateY(-2px);
}

.page-about .team-card__n {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--c-std);
  line-height: 1;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-sub);
}

/* 字段列表 */
.page-about .field-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  counter-reset: field;
}

.page-about .field-list__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .field-list__item:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .field-list__no {
  font-size: 0.8125rem;
  color: var(--c-muted);
  letter-spacing: 0.08em;
  padding-top: 4px;
}

.page-about .field-list__item h3 {
  margin: 0 0 6px;
}

.page-about .field-list__item p {
  margin: 0;
  max-width: 70ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-sub);
}

/* 刷新与复核 */
.page-about .check-strip {
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-panel);
  padding: 20px 18px;
}

.page-about .check-strip__title {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-muted);
  margin: 0 0 16px;
}

.page-about .check-strip__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .check-strip__cell {
  border-left: 1px solid var(--c-line);
  padding-left: 12px;
}

.page-about .check-strip__k {
  margin: 0 0 4px;
  font-size: 0.8125rem;
  color: var(--c-muted);
}

.page-about .check-strip__v {
  margin: 0;
  font-size: 1.125rem;
  color: var(--c-std);
  letter-spacing: -0.01em;
}

.page-about .check-strip__note {
  margin: 16px 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--c-sub);
}

/* 合作生态 */
.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .eco-list__item {
  padding: 16px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .eco-list__item:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .eco-list__k {
  margin: 0 0 6px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-beta);
}

.page-about .eco-list__item p:last-child {
  margin: 0;
  max-width: 70ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-sub);
}

.page-about .eco-list__item a {
  color: var(--c-std);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 227, 212, 0.45);
}

.page-about .eco-list__item a:hover {
  border-bottom-color: var(--c-std);
}

/* 数据带 */
.page-about .about-band-wrap {
  padding: 34px 0;
}

.page-about .about-band {
  border-top: 1px solid var(--c-std);
  padding-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.25rem, 8vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--c-std);
}

.page-about .about-band__note {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-muted);
}

/* 尾部行动区 */
.page-about .about-cta {
  padding: 46px 0 60px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-cta__inner {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--r-panel);
  padding: 28px 22px;
}

.page-about .about-cta__inner h2 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.015em;
  font-size: clamp(1.375rem, 4vw, 1.75rem);
  margin: 0 0 12px;
}

.page-about .about-cta__inner p {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-sub);
}

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

@media (min-width: 640px) {
  .page-about .usr-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-band {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    align-items: end;
    column-gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 36px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
    margin-top: 28px;
  }

  .page-about .about-facts {
    padding: 26px 24px;
  }

  .page-about .about-section {
    padding: 68px 0 10px;
  }

  .page-about .about-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-row__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 8px;
  }

  .page-about .about-row__rule {
    width: 1px;
    height: 42px;
    margin-left: 6px;
  }

  .page-about .tl__item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 22px;
    padding: 22px 18px 22px 0;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .field-list__item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .about-band-wrap {
    padding: 44px 0;
  }

  .page-about .about-cta {
    padding: 60px 0 80px;
  }

  .page-about .about-cta__inner {
    padding: 40px 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item,
  .page-about .usr-card,
  .page-about .team-card {
    transition: none;
  }

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