.page-about {
  --about-rule: var(--line);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-crumbs__sep {
  color: var(--line-strong);
}

.page-about .about-crumbs__now {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 52px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 9vw, 86px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero .lede {
  margin-top: clamp(18px, 3vw, 26px);
  max-width: 62ch;
}

.page-about .about-hero .cta-row {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .hero-fact {
  background: var(--bg-panel);
  padding: 18px 16px 20px;
}

.page-about .hero-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 5.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-fact__num--hot {
  color: var(--hot);
}

.page-about .hero-fact__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

/* ---------- 发展阶段 ---------- */
.page-about .about-stage .section__desc {
  max-width: 64ch;
}

.page-about .stage-chips {
  display: flex;
  gap: 8px;
  margin: clamp(22px, 4vw, 34px) 0 clamp(24px, 4vw, 40px);
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .stage-chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 240ms var(--ease);
}

.page-about .stage-chip .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--line-strong);
  transition: color 160ms var(--ease);
}

.page-about .stage-chip:hover,
.page-about .stage-chip:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
  background: var(--glass);
}

.page-about .stage-chip:hover .mono,
.page-about .stage-chip:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 6px 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 24px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--line-strong) 0%, var(--line-strong) 30%, var(--cyan) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-timeline__marker {
  position: absolute;
  left: -29px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--line-strong);
  transition: border-color 160ms var(--ease), background-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .about-timeline__body {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-panel);
  padding: clamp(18px, 3vw, 26px);
  transition: border-color 160ms var(--ease), background-color 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .about-timeline__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-timeline__body h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 66ch;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-timeline__item:target .about-timeline__marker {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 5px var(--glass);
}

.page-about .about-timeline__item:target .about-timeline__body {
  border-color: var(--cyan);
  background: var(--bg-raised);
  transform: translateX(4px);
}

.page-about .about-timeline__item:target .about-timeline__num {
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-roster-section .section__desc {
  max-width: 64ch;
}

.page-about .roster {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .roster__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: clamp(18px, 3vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .roster__num {
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--line-strong);
  transition: color 160ms var(--ease);
}

.page-about .roster__item:hover .roster__num,
.page-about .roster__item:focus-within .roster__num {
  color: var(--cyan);
}

.page-about .roster__text h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 700;
  color: var(--text);
}

.page-about .roster__text p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-roster__figure {
  margin: clamp(28px, 5vw, 46px) 0 0;
}

/* ---------- 校对流程 ---------- */
.page-about .about-proof .section__desc {
  max-width: 64ch;
}

.page-about .proof-flow {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .proof-flow__step {
  position: relative;
  padding: clamp(20px, 3vw, 26px);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-about .proof-flow__num {
  display: block;
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .proof-flow__step h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 700;
  color: var(--text);
}

.page-about .proof-flow__step p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .flow-arrow svg {
  transform: rotate(90deg);
}

.page-about .about-proof__figure {
  margin: clamp(28px, 5vw, 46px) 0 0;
}

.page-about .cadence {
  display: grid;
  margin-top: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 15px 18px;
  background: var(--bg-panel);
  transition: background-color 240ms var(--ease);
}

.page-about .cadence__row + .cadence__row {
  border-top: 1px solid var(--line);
}

.page-about .cadence__row:hover {
  background: var(--bg-raised);
}

.page-about .cadence__key {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .cadence__val {
  font-size: 15.5px;
  color: var(--text);
}

.page-about .cadence__val strong {
  color: var(--cyan);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 640px) {
  .page-about .cadence__row {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .proof-flow {
    grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr) 40px minmax(0, 1fr);
    gap: 0;
    align-items: center;
  }

  .page-about .flow-arrow svg {
    transform: none;
  }
}

/* ---------- 区域小组 ---------- */
.page-about .about-regions-section .section__desc {
  max-width: 64ch;
}

.page-about .about-regions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .region-card {
  background: var(--bg-panel);
  padding: clamp(20px, 3vw, 26px) clamp(18px, 2.5vw, 22px);
  transition: background-color 240ms var(--ease);
}

.page-about .region-card:hover {
  background: var(--bg-raised);
}

.page-about .region-card__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--cyan);
}

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

@media (min-width: 640px) {
  .page-about .about-regions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-regions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners .section__desc {
  max-width: 64ch;
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 4vw, 34px) 0 clamp(20px, 3vw, 28px);
}

.page-about .about-filter__btn {
  padding: 8px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 13.5px;
  cursor: pointer;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 240ms var(--ease);
}

.page-about .about-filter__btn:hover {
  border-color: var(--cyan-soft);
  color: var(--text);
}

.page-about .about-filter__btn.is-active,
.page-about .about-filter__btn[aria-pressed="true"] {
  border-color: var(--cyan);
  color: var(--bg);
  background: var(--cyan);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .partner-item {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-panel);
  transition: border-color 160ms var(--ease), background-color 240ms var(--ease);
}

.page-about .partner-item[hidden] {
  display: none;
}

.page-about .partner-item:hover {
  border-color: var(--cyan);
  background: var(--bg-raised);
}

.page-about .partner-item h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .partner-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .partner-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 专题与记录 ---------- */
.page-about .about-records .section__desc {
  max-width: 64ch;
}

.page-about .record-wrap {
  margin-top: clamp(24px, 4vw, 40px);
  overflow-x: auto;
  border-top: 1px solid var(--line);
}

.page-about .record-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  text-align: left;
}

.page-about .record-table th {
  padding: 14px 14px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .record-table td {
  padding: 16px 14px;
  font-size: 15.5px;
  color: var(--text);
  border-bottom: 1px solid var(--line);
}

.page-about .record-table td.mono {
  font-size: 15px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .record-table tbody tr {
  transition: background-color 240ms var(--ease);
}

.page-about .record-table tbody tr:hover {
  background: var(--bg-panel);
}

.page-about .about-records__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 结尾通栏 ---------- */
.page-about .about-closing {
  margin-top: clamp(56px, 9vw, 108px);
}

.page-about .about-closing__media {
  position: relative;
  overflow: hidden;
}

.page-about .about-closing__media img {
  display: block;
  width: 100%;
  height: clamp(200px, 34vw, 420px);
  object-fit: cover;
}

.page-about .about-closing__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 10, 28, 0.12) 0%, rgba(6, 10, 28, 0.9) 100%);
  pointer-events: none;
}

.page-about .about-closing__body {
  padding-top: clamp(28px, 5vw, 52px);
  padding-bottom: clamp(48px, 7vw, 84px);
}

.page-about .about-closing__body .lede {
  margin-top: 16px;
  max-width: 62ch;
}

.page-about .about-closing__body .cta-row {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__body,
  .page-about .about-timeline__marker,
  .page-about .roster__num,
  .page-about .stage-chip,
  .page-about .partner-item,
  .page-about .cadence__row,
  .page-about .region-card,
  .page-about .about-filter__btn {
    transition: none;
  }

  .page-about .about-timeline__item:target .about-timeline__body {
    transform: none;
  }
}
</main>