.page-about {
  --ab-gap: clamp(22px, 4vw, 40px);
  --ab-pad: clamp(44px, 7vw, 96px);
  background: var(--night);
  color: var(--cold);
  overflow-x: clip;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .sec-head {
  max-width: 58ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 10px 0 0;
  color: var(--cold);
}

.page-about .sec-head .label {
  color: var(--orange);
}

.page-about .sec-lead {
  margin: 14px 0 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.75;
  max-width: 60ch;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4vw, 48px) 0 clamp(44px, 6vw, 84px);
  border-bottom: 1px solid var(--hair);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 68%;
  height: 96%;
  background: radial-gradient(closest-side, rgba(255, 106, 42, .16), rgba(255, 106, 42, 0) 72%);
  pointer-events: none;
}

.page-about .hero-grid {
  position: relative;
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .hero-stamp {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
}

.page-about .hero-stamp .label {
  color: var(--orange);
}

.page-about .hero-years {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-main h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 7.4vw, 82px);
  line-height: 1.02;
  letter-spacing: -.02em;
  margin: 0;
  color: var(--cold);
  max-width: 16ch;
}

.page-about .hero-lead {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .hero-slab {
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius);
  background: linear-gradient(158deg, var(--float), var(--night-2) 78%);
  box-shadow: var(--shadow-float);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .slab-label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--line);
}

.page-about .slab-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .slab-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--hair);
}

.page-about .slab-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .slab-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 36px);
  line-height: 1;
  color: var(--cold);
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
}

.page-about .slab-key {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  padding: var(--ab-pad) 0;
  background: var(--night);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--hair-strong) 26%, var(--hair) 100%);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
}

.page-about .timeline-node {
  position: relative;
  padding-left: 26px;
  display: grid;
  gap: 12px;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 14px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--line);
}

.page-about .timeline-node--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, .18);
}

.page-about .timeline-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 8vw, 54px);
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--cold);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline-node--now .timeline-year {
  color: var(--orange);
}

.page-about .timeline-plaque {
  position: relative;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: var(--night-2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .22);
  padding: 18px 20px 20px;
}

.page-about .timeline-plaque .plaque-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .plaque-title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.3;
  letter-spacing: .01em;
  margin: 0 0 8px;
  color: var(--cold);
}

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

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: var(--ab-pad) 0;
  background: var(--night-2);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .team-grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .team-figure {
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--hair);
}

.page-about .team-figure img {
  width: 100%;
  object-fit: cover;
  filter: saturate(.68) brightness(.92);
}

.page-about .media-caption {
  display: block;
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  background: var(--night);
  border-top: 1px solid var(--hair);
}

.page-about .team-copy .label {
  color: var(--orange);
}

.page-about .team-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 10px 0 0;
  color: var(--cold);
}

.page-about .team-lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .team-note {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--cold);
}

.page-about .team-roles {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hair);
}

.page-about .role {
  padding: 20px 0;
  border-bottom: 1px solid var(--hair);
  transition: background-color .2s ease;
}

.page-about .role:hover {
  background: rgba(255, 106, 42, .05);
}

.page-about .role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  color: var(--cold);
  font-variant-numeric: tabular-nums;
  transition: color .2s ease;
}

.page-about .role:hover .role-num {
  color: var(--orange);
}

.page-about .role-title {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .02em;
  margin: 10px 0 6px;
  color: var(--cold);
}

.page-about .role-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 横向数据带 ---------- */

.page-about .about-pulse {
  position: relative;
  padding: clamp(54px, 9vw, 116px) 0;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  overflow: hidden;
  background: var(--night);
}

.page-about .pulse-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.5) brightness(.42) contrast(1.06);
}

.page-about .about-pulse::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(96deg, rgba(14, 31, 26, .95) 0%, rgba(14, 31, 26, .74) 52%, rgba(14, 31, 26, .93) 100%);
}

.page-about .pulse-inner {
  position: relative;
  z-index: 1;
}

.page-about .pulse-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.1;
  letter-spacing: -.01em;
  margin: 0 0 clamp(24px, 4vw, 40px);
  color: var(--cold);
  max-width: 20ch;
}

.page-about .pulse-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .pulse-metrics li {
  border-top: 1px solid var(--hair-strong);
  padding-top: 16px;
}

.page-about .pulse-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  display: block;
}

.page-about .pulse-metrics p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 34ch;
}

/* ---------- 复核流程 ---------- */

.page-about .about-verify {
  padding: var(--ab-pad) 0;
  background: var(--night);
}

.page-about .verify-grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .verify-copy .label {
  color: var(--orange);
}

.page-about .verify-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 10px 0 0;
  color: var(--cold);
  max-width: 18ch;
}

.page-about .verify-lead {
  margin: 16px 0 clamp(22px, 3vw, 30px);
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 56ch;
}

.page-about .verify-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .verify-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--hair);
}

.page-about .verify-step:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
  padding-top: 5px;
}

.page-about .step-body h3 {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .02em;
  margin: 0 0 6px;
  color: var(--cold);
}

.page-about .step-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .verify-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--hair);
}

.page-about .verify-figure img {
  width: 100%;
  object-fit: cover;
  filter: saturate(.7) brightness(.94);
}

/* ---------- 内容覆盖 ---------- */

.page-about .about-scope {
  padding: var(--ab-pad) 0;
  background: var(--cream);
  color: var(--ink);
}

.page-about .sec-head--ink h2 {
  color: var(--ink);
}

.page-about .sec-head--ink .label {
  color: var(--ember);
}

.page-about .sec-head--ink .sec-lead {
  color: rgba(42, 33, 28, .72);
}

.page-about .scope-grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .scope-subtitle {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(42, 33, 28, .55);
  margin: 0 0 14px;
  font-weight: 600;
}

.page-about .scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(42, 33, 28, .18);
}

.page-about .scope-item {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid rgba(42, 33, 28, .14);
}

.page-about .scope-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .scope-desc {
  font-size: 15px;
  line-height: 1.72;
  color: rgba(42, 33, 28, .74);
}

.page-about .sport-cloud {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .sport-chip {
  border: 1px solid rgba(42, 33, 28, .24);
  border-radius: 999px;
  padding: 6px 15px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .05em;
  color: var(--ink);
  background: rgba(255, 255, 255, .42);
}

.page-about .scope-foot {
  margin: 18px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(42, 33, 28, .72);
}

.page-about .scope-link {
  display: inline-block;
  margin-top: 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .scope-link:hover {
  color: var(--ember);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  padding: var(--ab-pad) 0;
  background: var(--night);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

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

.page-about .partner-item {
  border: 1px solid var(--hair-strong);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--cold);
  background: rgba(30, 58, 48, .46);
  transition: background-color .18s ease, border-color .18s ease;
}

.page-about .partner-item:hover {
  border-color: var(--orange);
  background: rgba(30, 58, 48, .82);
}

.page-about .filter-empty {
  margin: 18px 0 0;
  font-size: 14.5px;
  color: var(--mist);
}

.page-about .honor-strip {
  margin-top: clamp(32px, 5vw, 52px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--hair-strong);
  display: grid;
  gap: 18px;
}

.page-about .honor-title {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--line);
  margin: 0;
  font-weight: 600;
}

.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .honor-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .honor-year {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
}

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

/* ---------- 下一步 ---------- */

.page-about .about-next {
  padding: var(--ab-pad) 0 calc(var(--ab-pad) + 8px);
  background: var(--night-2);
  border-top: 1px solid var(--hair);
}

.page-about .next-grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .next-copy .label {
  color: var(--orange);
}

.page-about .next-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 10px 0 0;
  color: var(--cold);
}

.page-about .next-lead {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 44ch;
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hair);
}

.page-about .next-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .next-link {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: .01em;
  color: var(--cold);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .next-item p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
  max-width: 52ch;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .pulse-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .honor-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

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

  .page-about .role {
    padding: 22px 20px 22px 0;
    border-bottom: 0;
  }

  .page-about .role + .role {
    border-left: 1px solid var(--hair);
    padding-left: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline::before {
    left: 134px;
  }

  .page-about .timeline-node {
    grid-template-columns: 120px minmax(0, 1fr);
    column-gap: 28px;
    padding-left: 0;
    align-items: start;
  }

  .page-about .timeline-node::before {
    left: 129px;
    top: 16px;
  }

  .page-about .timeline-year {
    text-align: right;
    font-size: clamp(40px, 5vw, 56px);
  }

  .page-about .scope-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (min-width: 980px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
    column-gap: clamp(32px, 5vw, 64px);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    column-gap: clamp(32px, 5vw, 64px);
  }

  .page-about .verify-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    column-gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .next-grid {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    column-gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .honor-strip {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: start;
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .role-num,
  .page-about .partner-item,
  .page-about .next-link {
    transition: none;
  }
}