.page-about {
  --about-rail-w: 96px;
  --about-rail-w-lg: 160px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .16;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -80px;
  right: -120px;
  width: 380px;
  height: 380px;
  background: linear-gradient(140deg, rgba(43, 227, 210, .14), rgba(255, 122, 41, .07) 65%, transparent 75%);
  transform: rotate(-6deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin: 0 0 20px;
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-size: clamp(32px, 7vw, 56px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  max-width: 42ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 36px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin: 0;
  align-self: start;
}

/* ---------- 锚点目录 ---------- */
.page-about .about-toc {
  border-bottom: 1px solid var(--line);
  background: rgba(18, 40, 61, .55);
}

.page-about .about-toc .kt-shell {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.page-about .about-toc .kt-catalog__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-toc .kt-catalog__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc .kt-catalog__link {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .about-toc .kt-catalog__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: 56px 0 8px;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-origin__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--orange);
}

.page-about .about-origin__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-origin__note {
  margin: 0;
  font-size: 12px;
  font-style: italic;
  color: var(--muted);
}

.page-about .about-origin__body {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 40ch;
}

.page-about .about-origin__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-origin__body p + p {
  color: var(--muted);
}

/* ---------- 纵向主轴 ---------- */
.page-about .about-stream {
  padding: 24px 0 72px;
}

.page-about .about-block {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail-w) 1fr;
  gap: 18px;
  padding: 44px 0 8px;
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-child {
  border-top-color: var(--cyan);
}

.page-about .about-block__rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  align-self: start;
}

.page-about .about-block__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-block__axis {
  display: block;
  width: 1px;
  height: 46px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
}

.page-about .about-block__body {
  min-width: 0;
  padding-bottom: 40px;
}

.page-about .about-block__title {
  margin: 0 0 8px;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-block__note {
  margin: 0 0 18px;
  font-size: 12px;
  font-style: italic;
  color: var(--muted);
}

.page-about .about-block__lead {
  max-width: 40ch;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 小组卡片 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  transition: border-left-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  border-left-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .about-team__idx {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 资料来源 ---------- */
.page-about .about-sources {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-source {
  padding: 18px 18px 20px;
  background: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-source--l1 {
  border-top: 3px solid var(--cyan);
  margin-right: 0;
}

.page-about .about-source--l2 {
  border-top: 3px solid var(--orange);
}

.page-about .about-source--l3 {
  border-top: 3px solid var(--muted);
}

.page-about .about-source__step {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-source__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-source__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-sources__process {
  padding: 18px 18px 18px 20px;
  border-left: 2px solid var(--cyan);
  background: rgba(43, 227, 210, .05);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 24px;
}

.page-about .about-sources__process p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-sources__process strong {
  color: var(--cyan);
  font-weight: 700;
}

.page-about .about-sources__media {
  margin: 0;
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-history::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 12px;
  left: 6px;
  width: 1px;
  background: var(--line);
}

.page-about .about-history__item {
  position: relative;
  padding: 0 0 26px 0;
}

.page-about .about-history__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -25px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 41, .16);
}

.page-about .about-history__item--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 227, 210, .18);
}

.page-about .about-history__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-history__item--current .about-history__year {
  color: var(--cyan);
}

.page-about .about-history__stage {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-history__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 24px;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-2);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-partners__taglabel {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-taglist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 26px;
}

.page-about .about-partners__media {
  margin: 0;
}

/* ---------- 来信与联系 ---------- */
.page-about .about-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0 0 26px;
}

.page-about .about-contact__item {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-3);
}

.page-about .about-contact__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-contact__value {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-contact__value a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
}

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

.page-about .about-contact__hint {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-note-card {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-note-card .kt-card__index {
  color: var(--ink);
  opacity: .65;
}

.page-about .about-note-card .kt-card__body {
  color: #223142;
}

.page-about .about-note-card .kt-card__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-note-card .kt-btn--ghost {
  color: var(--ink);
  border-color: rgba(11, 27, 43, .32);
}

.page-about .about-note-card .kt-btn--ghost:hover,
.page-about .about-note-card .kt-btn--ghost:focus-visible {
  color: var(--ink);
  border-color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 56px 0 44px;
  }

  .page-about .about-origin {
    padding: 72px 0 16px;
  }

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

  .page-about .about-sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-source--l1 {
    margin-top: 0;
  }

  .page-about .about-source--l2 {
    margin-top: 14px;
  }

  .page-about .about-source--l3 {
    margin-top: 28px;
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 72px 0 52px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.35fr .65fr;
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero__figure {
    transform: translateY(8px) rotate(-1.2deg);
  }

  .page-about .about-origin__grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-origin__head {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .about-block {
    grid-template-columns: var(--about-rail-w-lg) 1fr;
    gap: 44px;
    padding: 64px 0 8px;
  }

  .page-about .about-block__rail {
    position: sticky;
    top: calc(var(--header-h) + 40px);
  }

  .page-about .about-block__num {
    font-size: 30px;
  }

  .page-about .about-block__axis {
    height: 72px;
  }

  .page-about .about-block__body {
    padding-bottom: 56px;
    padding-right: 12px;
  }

  .page-about .about-sources__media {
    margin-left: auto;
    max-width: 720px;
  }

  .page-about .about-partners__media {
    max-width: 780px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-toc .kt-catalog__link {
    transition: none;
  }

  .page-about .about-team:hover,
  .page-about .about-team:focus-within {
    transform: none;
  }
}