.page-about {
  --ab-rail-w: 200px;
  --ab-block-gap: 56px;
  background: var(--hy-paper);
  color: var(--hy-ink);
}

.page-about .hy-breadcrumb {
  padding: 20px 0 4px;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 12px 0 40px;
  border-bottom: 1px solid var(--hy-line);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: 28px;
  align-items: end;
}

.page-about .ab-hero__text > * + * {
  margin-top: 16px;
}

.page-about .hy-h1 {
  max-width: 16em;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 20px;
}

.page-about .ab-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--hy-line);
  font-size: 14px;
  color: var(--hy-ink-2);
}

.page-about .ab-hero__num {
  font-size: 20px;
  font-weight: 700;
  color: var(--hy-red);
}

.page-about .ab-hero__figure {
  margin: 0;
}

.page-about .ab-hero__figure img,
.page-about .ab-team__figure img,
.page-about .ab-history__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--hy-r);
  border: 1px solid var(--hy-line);
}

/* ---------- 档案夹总布局 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: 32px;
  padding: 40px 0 72px;
}

.page-about .ab-rail__title {
  font-size: 12px;
  color: var(--hy-teal);
  margin: 0 0 12px;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--hy-ink-2);
  text-decoration: none;
  background: var(--hy-white);
  border: 1px solid var(--hy-line);
  border-radius: var(--hy-r);
  transition: color var(--hy-dur) var(--hy-ease), border-color var(--hy-dur) var(--hy-ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--hy-red-dark);
  border-color: var(--hy-red);
  outline: none;
}

.page-about .ab-rail__num {
  font-size: 12px;
  color: var(--hy-teal);
}

.page-about .ab-rail__link:hover .ab-rail__num {
  color: var(--hy-red);
}

.page-about .ab-boards {
  min-width: 0;
}

/* ---------- 画板 ---------- */
.page-about .ab-block {
  border-top: 1px solid var(--hy-line);
  padding-top: 24px;
  scroll-margin-top: 120px;
}

.page-about .ab-boards > .ab-block + .ab-block {
  margin-top: var(--ab-block-gap);
}

.page-about .ab-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .ab-block__num {
  font-size: 13px;
  color: var(--hy-gold);
  color: #B58420;
}

.page-about .ab-block__title {
  margin: 0;
}

.page-about .ab-block__lead {
  margin: 0 0 24px;
  max-width: 60ch;
}

.page-about .ab-prose {
  max-width: 68ch;
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  line-height: 1.75;
}

/* ---------- 要点表 ---------- */
.page-about .ab-facts {
  margin: 28px 0 0;
  display: grid;
  gap: 0;
}

.page-about .ab-facts__item {
  padding: 16px 0;
  border-bottom: 1px solid var(--hy-line);
}

.page-about .ab-facts__item dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--hy-teal-deep);
  margin-bottom: 6px;
}

.page-about .ab-facts__item dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--hy-ink-2);
}

/* ---------- 历程 ---------- */
.page-about .ab-history {
  display: grid;
  gap: 32px;
}

.page-about .ab-timeline {
  position: relative;
  padding-left: 30px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--hy-line);
}

.page-about .ab-node {
  position: relative;
  border-bottom: 1px solid var(--hy-line);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 15px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--hy-teal);
  background: radial-gradient(circle, var(--hy-teal) 0 2.5px, var(--hy-paper) 2.5px 100%);
  transition: border-color var(--hy-dur) var(--hy-ease), background var(--hy-dur) var(--hy-ease);
}

.page-about .ab-node[open]::before {
  border-color: var(--hy-red);
  background: radial-gradient(circle, var(--hy-red) 0 2.5px, var(--hy-paper) 2.5px 100%);
}

.page-about .ab-node__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-node__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-node__sum:focus-visible {
  outline: 2px solid var(--hy-red);
  outline-offset: 2px;
}

.page-about .ab-node__phase {
  font-size: 12px;
  color: var(--hy-teal-deep);
  border-bottom: 2px solid var(--hy-gold);
  padding-bottom: 2px;
}

.page-about .ab-node__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--hy-ink);
}

.page-about .ab-node[open] .ab-node__name {
  color: var(--hy-red-dark);
}

.page-about .ab-node__list {
  margin: 0 0 18px;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .ab-node__list li {
  position: relative;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hy-ink-2);
  padding: 4px 0;
}

.page-about .ab-node__list li::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 15px;
  width: 6px;
  height: 1px;
  background: var(--hy-teal);
}

.page-about .ab-history__figure {
  margin: 0;
  max-width: 420px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 32px;
}

.page-about .ab-team__row {
  padding: 16px 0;
  border-bottom: 1px solid var(--hy-line);
}

.page-about .ab-team__row:focus-visible {
  outline: 2px solid var(--hy-red);
  outline-offset: 2px;
}

.page-about .ab-team__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .ab-team__label {
  font-size: 16px;
  font-weight: 700;
  color: var(--hy-ink);
}

.page-about .ab-team__count {
  font-size: 13px;
  color: var(--hy-teal-deep);
}

.page-about .ab-team__bar {
  display: block;
  height: 8px;
  background: var(--hy-mist);
  overflow: hidden;
}

.page-about .ab-team__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
}

.page-about .ab-team__fill--dev { background: var(--hy-ink); }
.page-about .ab-team__fill--content { background: var(--hy-teal); }
.page-about .ab-team__fill--ops { background: var(--hy-red); }
.page-about .ab-team__fill--sup { background: var(--hy-gold); }

.page-about .ab-team__work {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--hy-teal-deep);
  max-width: 58ch;
}

.page-about .ab-team__figure {
  margin: 0;
}

/* ---------- 资质卡 ---------- */
.page-about .ab-cards {
  display: grid;
  gap: 20px;
}

.page-about .ab-card {
  background: var(--hy-white);
  border: 1px solid var(--hy-line);
  border-radius: var(--hy-r);
  padding: 24px 22px;
  transition: transform var(--hy-dur) var(--hy-ease), border-color var(--hy-dur) var(--hy-ease),
    box-shadow var(--hy-dur) var(--hy-ease);
}

.page-about .ab-card:hover {
  transform: translateY(-4px);
  border-color: var(--hy-teal);
  box-shadow: 0 10px 26px rgba(28, 28, 30, 0.07);
}

.page-about .ab-card__num {
  display: inline-block;
  font-size: 12px;
  color: var(--hy-teal);
  margin-bottom: 12px;
}

.page-about .ab-card__title {
  margin: 0 0 4px;
  font-size: 22px;
}

.page-about .ab-card__meta {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--hy-red-dark);
}

.page-about .ab-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hy-ink-2);
}

.page-about .ab-a11y {
  margin-top: 24px;
  padding: 16px 18px;
  background: var(--hy-mist);
  border-left: 3px solid var(--hy-teal);
}

.page-about .ab-a11y .hy-note {
  margin: 0;
  color: var(--hy-teal-deep);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .ab-coverage {
  display: grid;
  gap: 32px;
}

.page-about .ab-dots {
  position: relative;
  height: 168px;
  border: 1px solid var(--hy-line);
  border-radius: var(--hy-r);
  background-color: var(--hy-white);
  background-image: radial-gradient(circle, var(--hy-teal) 0 3px, transparent 3.4px);
  background-size: 38px 45px;
  background-position: 12px 12px;
  overflow: hidden;
}

.page-about .ab-dots__core {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--hy-teal-deep) 0 3.4px, transparent 3.8px);
  background-size: 38px 45px;
  background-position: 12px 12px;
  clip-path: polygon(0 0, 64% 0, 56% 38%, 34% 48%, 28% 100%, 0 100%);
}

.page-about .ab-coverage__legend {
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 13px;
  color: var(--hy-teal-deep);
}

.page-about .ab-legend {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .ab-legend__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--hy-teal);
}

.page-about .ab-legend__dot--deep {
  background: var(--hy-teal-deep);
}

.page-about .ab-facts--tight {
  margin-top: 0;
}

.page-about .ab-coverage__note {
  margin: 20px 0 0;
  color: var(--hy-teal-deep);
  max-width: 52ch;
}

/* ---------- 支持节奏 ---------- */
.page-about .ab-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-rhythm__item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--hy-line);
}

.page-about .ab-rhythm__num {
  font-size: 13px;
  color: var(--hy-red);
  padding-top: 4px;
}

.page-about .ab-rhythm__title {
  margin: 0 0 6px;
}

.page-about .ab-rhythm__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--hy-ink-2);
}

.page-about .ab-links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}

.page-about .ab-links__text {
  font-size: 14px;
  color: var(--hy-teal-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--hy-line);
  padding-bottom: 2px;
}

.page-about .ab-links__text:hover,
.page-about .ab-links__text:focus-visible {
  color: var(--hy-red-dark);
  border-bottom-color: var(--hy-red);
}

.page-about .ab-promise {
  margin: 40px 0 0;
  padding: 22px 24px;
  background: var(--hy-white);
  border-left: 3px solid var(--hy-red);
  font-size: 18px;
  line-height: 1.7;
  color: var(--hy-ink);
  max-width: 62ch;
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .ab-hero {
    padding: 20px 0 52px;
  }

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

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

  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-layout {
    padding: 48px 0 88px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .ab-history,
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
    gap: 40px;
  }

  .page-about .ab-team__work {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height var(--hy-dur) var(--hy-ease), opacity var(--hy-dur) var(--hy-ease),
      margin-top var(--hy-dur) var(--hy-ease);
  }

  .page-about .ab-team__row:hover .ab-team__work,
  .page-about .ab-team__row:focus-within .ab-team__work {
    max-height: 90px;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 116px;
    align-self: start;
    padding: 20px 20px 20px 0;
    background: var(--hy-glass);
    border-right: 1px solid var(--hy-line);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__list li + li {
    margin-top: 2px;
  }

  .page-about .ab-rail__link {
    display: flex;
    border: 0;
    border-left: 2px solid var(--hy-line);
    border-radius: 0;
    background: transparent;
    padding: 9px 0 9px 14px;
    font-size: 15px;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    border-left-color: var(--hy-red);
    background: var(--hy-red-soft);
  }

  .page-about .ab-block {
    padding-top: 28px;
  }

  .page-about .ab-boards > .ab-block + .ab-block {
    margin-top: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card,
  .page-about .ab-rail__link,
  .page-about .ab-team__work,
  .page-about .ab-node::before {
    transition: opacity 160ms linear;
  }

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

.page-about {
  --w: 1rem;
}