.page-about {
  --about-rail: 214px;
  --about-rule: rgba(155, 176, 198, .24);
  padding-bottom: clamp(72px, 9vw, 132px);
}

/* ── 首屏 ───────────────────────────────── */
.page-about .about-hero {
  padding-block: clamp(40px, 7vw, 88px) clamp(30px, 4.5vw, 56px);
  border-bottom: 2px solid var(--hair);
}

.page-about .about-hero h1 {
  max-width: 22ch;
  margin: 14px 0 0;
}

.page-about .about-hero .lede {
  max-width: 46em;
  margin-top: 20px;
  color: var(--mist);
}

.page-about .hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 48px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 2px dashed var(--hair);
  list-style: none;
}

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

.page-about .hero-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-stats__txt {
  font-size: 14px;
  color: var(--mist);
}

/* ── 骨架：左索引 + 右正文 ───────────────── */
.page-about .about-shell {
  display: grid;
  gap: clamp(30px, 4.5vw, 60px);
  padding-top: clamp(38px, 5.5vw, 68px);
}

.page-about .about-rail {
  border-top: 2px solid var(--hair);
  padding-top: 12px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list a {
  display: block;
  white-space: nowrap;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist);
  text-decoration: none;
  border: 2px solid transparent;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--ice);
  border-color: var(--cyan);
  background: rgba(63, 242, 214, .08);
}

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

/* ── 章节 ───────────────────────────────── */
.page-about .about-sec {
  position: relative;
  padding-block: clamp(42px, 6vw, 76px);
  border-top: 2px solid var(--hair);
  scroll-margin-top: calc(var(--bar-h) + 20px);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-sec__no {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6.5vw, 72px);
  font-weight: 700;
  line-height: .82;
  letter-spacing: -.04em;
  color: rgba(63, 242, 214, .2);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.28;
  color: var(--ice);
}

.page-about .about-sec__lede {
  max-width: 42em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .prose p {
  max-width: 36em;
  margin: 0 0 1.1em;
  line-height: 1.85;
  color: rgba(242, 246, 250, .9);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ── 图片 ───────────────────────────────── */
.page-about .img-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-band {
  margin: 0 0 clamp(26px, 3.6vw, 42px);
}

/* ── 团队 ───────────────────────────────── */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card {
  padding: clamp(20px, 2.6vw, 28px);
  border: 2px solid var(--hair-strong);
  background: var(--panel);
  box-shadow: -5px 5px 0 rgba(4, 10, 20, .55);
  transition: transform .18s ease, border-color .18s ease;
}

.page-about .team-card:hover {
  transform: translate(3px, -3px);
  border-color: var(--cyan);
}

.page-about .team-card__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .team-card__role {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--ice);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ── 校验流程 ────────────────────────────── */
.page-about .checkflow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .checkflow__step {
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
}

.page-about .checkflow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .checkflow__name {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .checkflow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .checkflow-line {
  display: block;
  width: 100%;
  height: auto;
  margin-top: clamp(26px, 3.6vw, 40px);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--hair);
  overflow: visible;
}

.page-about .checkflow-line__axis {
  stroke: var(--hair-strong);
  stroke-width: 2;
  stroke-dasharray: 4 6;
}

.page-about .checkflow-line__tick {
  stroke: var(--hair-strong);
  stroke-width: 2;
}

.page-about .checkflow-line__path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linejoin: round;
}

.page-about .checkflow-line__dot {
  fill: var(--ink);
  stroke: var(--cyan);
  stroke-width: 3;
}

.page-about .checkflow-line__dot--end {
  fill: var(--orange);
  stroke: var(--orange);
}

/* ── 时间线 ─────────────────────────────── */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--amber) 58%, rgba(155, 176, 198, .22) 100%);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 19px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--amber);
  border-radius: 50%;
  background: var(--ink);
  z-index: 1;
}

.page-about .timeline__fold {
  border: 0;
  border-bottom: 2px solid var(--hair);
}

.page-about .timeline__summary {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 16px 6px 16px 0;
  cursor: pointer;
  list-style: none;
  outline-offset: 4px;
}

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

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  transition: color .2s ease;
}

.page-about .timeline__stage {
  font-size: 17px;
  font-weight: 600;
  color: var(--ice);
}

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

.page-about .timeline__fold[open] .timeline__year {
  color: var(--cyan);
}

.page-about .timeline__fold .fold__body {
  padding: 0 0 20px 96px;
}

.page-about .timeline__fold .fold__body p {
  max-width: 38em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ── 内容共建 ───────────────────────────── */
.page-about .about-partners {
  padding: clamp(22px, 3vw, 34px);
  border: 2px solid rgba(242, 246, 250, .2);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .about-partners p {
  max-width: 40em;
  margin: 0 0 1em;
  line-height: 1.85;
  color: rgba(242, 246, 250, .9);
}

.page-about .about-partners p:last-child {
  margin-bottom: 0;
}

/* ── 荣誉 ───────────────────────────────── */
.page-about .honor {
  padding: clamp(20px, 3vw, 34px);
  border: 2px solid rgba(242, 246, 250, .22);
  box-shadow: var(--hard-shadow);
}

.page-about .honor .tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 2px solid rgba(242, 246, 250, .2);
}

.page-about .honor .tabs__btn {
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: rgba(242, 246, 250, .72);
  background: transparent;
  border: 2px solid rgba(242, 246, 250, .26);
  cursor: pointer;
}

.page-about .honor .tabs__btn:hover {
  color: var(--ice);
  border-color: var(--amber);
}

.page-about .honor .tabs__btn[aria-selected="true"] {
  color: var(--ink);
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .honor .tabs__panel[hidden] {
  display: none;
}

.page-about .honor-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .honor-list li {
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 246, 250, .86);
}

.page-about .honor-list strong {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--amber);
}

/* ── 更多入口 ───────────────────────────── */
.page-about .more-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .more-card {
  display: block;
  padding: clamp(20px, 2.6vw, 28px);
  border: 2px solid var(--hair-strong);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--hard-shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.page-about .more-card:hover,
.page-about .more-card:focus-visible {
  transform: translate(-3px, -3px);
  border-color: var(--cyan);
  box-shadow: 8px 8px 0 rgba(4, 10, 20, .6);
}

.page-about .more-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .more-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .more-card__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
}

/* ── 断点 ───────────────────────────────── */
@media (min-width: 560px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .checkflow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

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

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
    align-self: start;
    padding-top: 16px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__list a {
    white-space: normal;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--about-rule);
    background: none;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--cyan);
    background: none;
    color: var(--ice);
  }
}

@media (max-width: 479px) {
  .page-about .timeline {
    padding-left: 26px;
  }

  .page-about .timeline__item::before {
    left: -26px;
    width: 14px;
    height: 14px;
  }

  .page-about .timeline__summary {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .timeline__fold .fold__body {
    padding-left: 0;
  }
}

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

  .page-about .team-card:hover,
  .page-about .more-card:hover,
  .page-about .more-card:focus-visible {
    transform: none;
  }
}