.page-about {
  background: var(--snow);
  color: var(--ink);
}

.page-about .section {
  padding-block: clamp(48px, 7vw, 92px);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(28px, 4vw, 44px) clamp(48px, 7vw, 84px);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 4.5vw, 60px);
}

.page-about .hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 5.4vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.022em;
  margin: 12px 0 20px;
  text-wrap: balance;
}

.page-about .hero-lead {
  margin: 0 0 16px;
  font-size: clamp(16.5px, 1.5vw, 19px);
  line-height: 1.78;
  color: #23232b;
  max-width: 36em;
}

.page-about .hero-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 36em;
}

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

.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .fact-list li {
  background: var(--white);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .fact-value {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2vw, 23px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .fact-label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* ---------- 通用小节标题 ---------- */
.page-about .section-head {
  max-width: 50em;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.5vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.016em;
  margin: 10px 0 16px;
  text-wrap: balance;
}

.page-about .section-intro {
  margin: 0;
  font-size: clamp(15.5px, 1.25vw, 17px);
  line-height: 1.8;
  color: #2c2c35;
  max-width: 42em;
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(34px, 5vw, 68px);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .tl-marker {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .tl-index {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(58px, 9vw, 108px);
  line-height: 0.86;
  letter-spacing: -0.045em;
  color: var(--gold);
}

.page-about .tl-stage {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--stone);
  white-space: nowrap;
}

.page-about .tl-panel {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: clamp(22px, 3vw, 34px);
  box-shadow: var(--shadow-1);
  transition: transform var(--t-mid), box-shadow var(--t-mid), border-color var(--t-mid);
}

.page-about .tl-panel:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2);
  border-color: var(--line-gold);
}

.page-about .tl-panel h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.32;
  margin: 0 0 12px;
}

.page-about .tl-panel p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #2a2a33;
  max-width: 46em;
}

.page-about .tl-media {
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .media-caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, rgba(235, 203, 139, 0.22), rgba(247, 245, 241, 0) 62%);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 4.5vw, 60px);
}

.page-about .team-copy .section-head {
  margin-bottom: clamp(20px, 2.6vw, 30px);
}

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

.page-about .workflow li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .workflow li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .workflow-idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--gold);
  padding-top: 5px;
  white-space: nowrap;
}

.page-about .workflow-body strong {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  margin-bottom: 5px;
}

.page-about .workflow-body span {
  display: block;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .team-side {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: clamp(20px, 2.6vw, 30px);
}

.page-about .team-ring {
  position: relative;
  width: min(228px, 58vw);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    var(--gold) 0deg 216deg,
    var(--clay) 216deg 288deg,
    var(--moss) 288deg 360deg
  );
  box-shadow: var(--shadow-1);
}

.page-about .team-ring::before {
  content: "";
  position: absolute;
  inset: 23%;
  border-radius: 50%;
  background: var(--snow);
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-about .team-ring-core {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-about .team-ring-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .team-ring-unit {
  display: block;
  margin-top: 6px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .ring-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ring-legend li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  font-size: 14px;
  transition: transform var(--t-fast), border-color var(--t-fast);
}

.page-about .ring-legend li:hover {
  transform: translateY(-2px);
  border-color: var(--line-gold);
}

.page-about .legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.page-about .dot-gold { background: var(--gold); }
.page-about .dot-clay { background: var(--clay); }
.page-about .dot-moss { background: var(--moss); }

.page-about .legend-num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-photo {
  margin-top: clamp(32px, 4.5vw, 60px);
}

/* ---------- 服务版图 ---------- */
.page-about .reach-panel {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: var(--snow);
  border-radius: var(--radius-l);
  padding: clamp(28px, 4vw, 56px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  box-shadow: var(--shadow-2);
}

.page-about .reach-panel::before {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: 70%;
  height: 92%;
  background: radial-gradient(ellipse at center, rgba(200, 150, 62, 0.32), transparent 68%);
  pointer-events: none;
}

.page-about .reach-copy {
  position: relative;
}

.page-about .reach-panel .eyebrow {
  color: var(--gold-soft);
}

.page-about .reach-panel h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.3vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.014em;
  color: var(--white);
  margin: 10px 0 18px;
  text-wrap: balance;
}

.page-about .reach-panel p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(247, 245, 241, 0.84);
  max-width: 40em;
}

.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  background: rgba(235, 203, 139, 0.22);
  border-radius: var(--radius-s);
  overflow: hidden;
}

.page-about .reach-stats > div {
  background: rgba(16, 16, 20, 0.42);
  padding: 16px 14px;
}

.page-about .reach-stats dt {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  color: var(--gold-soft);
  line-height: 1.1;
}

.page-about .reach-stats dd {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(247, 245, 241, 0.72);
}

.page-about .reach-map {
  position: relative;
  align-self: center;
}

.page-about .map-svg {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-m);
  background: rgba(16, 16, 20, 0.32);
  padding: 16px 12px;
  box-sizing: border-box;
}

.page-about .map-dot {
  fill: rgba(235, 203, 139, 0.32);
}

.page-about .map-dot--hub {
  fill: var(--gold);
  filter: drop-shadow(0 0 8px rgba(200, 150, 62, 0.75));
}

.page-about .map-caption {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(235, 203, 139, 0.78);
}

.page-about .reach-photo {
  margin-top: clamp(28px, 4vw, 48px);
}

/* ---------- 协作生态 ---------- */
.page-about .collab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

.page-about .collab-card {
  position: relative;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: clamp(24px, 3vw, 36px);
  box-shadow: var(--shadow-1);
  transition: transform var(--t-mid), box-shadow var(--t-mid), border-color var(--t-mid);
}

.page-about .collab-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--clay));
}

.page-about .collab-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2);
  border-color: var(--line-gold);
}

.page-about .collab-num {
  display: block;
  font-size: clamp(40px, 5.4vw, 58px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .collab-card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2vw, 23px);
  margin: 0 0 12px;
}

.page-about .collab-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: #2c2c35;
}

.page-about .collab-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .collab-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .collab-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--gold-soft);
}

/* ---------- 运营准则 ---------- */
.page-about .rules-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 56px);
}

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

.page-about .rules-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rules-list li:first-child {
  border-top: 1px solid var(--line);
}

.page-about .rule-key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  padding-top: 5px;
}

.page-about .rule-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  margin: 0 0 8px;
}

.page-about .rule-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #2c2c35;
  max-width: 40em;
}

.page-about .rules-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .filing-card {
  align-self: start;
  background: linear-gradient(150deg, var(--navy), #1d2a4d);
  color: var(--snow);
  border-radius: var(--radius-m);
  padding: clamp(24px, 3vw, 34px);
  box-shadow: var(--shadow-2);
}

.page-about .filing-label {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--gold-soft);
}

.page-about .filing-value {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.7vw, 18px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  word-break: break-all;
}

.page-about .filing-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 245, 241, 0.78);
}

/* ---------- 迭代节奏 ---------- */
.page-about .iter-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .iter-cell {
  background: var(--white);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .iter-cell strong {
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
}

.page-about .iter-cell span {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .iter-note {
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .iter-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #2c2c35;
  max-width: 46em;
}

.page-about .iter-note a {
  color: var(--clay);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .iter-note a:hover {
  color: var(--gold);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .cta-panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-l);
  border: 1px solid var(--line-gold);
  padding: clamp(30px, 4.5vw, 60px);
  background: linear-gradient(118deg, var(--gold-soft), var(--snow) 64%);
}

.page-about .cta-panel::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -60px;
  width: 300px;
  height: 300px;
  background: var(--navy);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  opacity: 0.09;
  pointer-events: none;
}

.page-about .cta-panel h2 {
  position: relative;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.016em;
  margin: 0 0 14px;
}

.page-about .cta-panel p {
  position: relative;
  margin: 0;
  font-size: clamp(15.5px, 1.3vw, 17px);
  line-height: 1.8;
  color: #2c2c35;
  max-width: 40em;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .collab-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .tl-item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 3.6vw, 56px);
    align-items: start;
  }

  .page-about .tl-marker {
    display: block;
    padding-top: 6px;
  }

  .page-about .tl-stage {
    display: block;
    margin-top: 10px;
  }

  .page-about .tl-item:nth-child(even) {
    grid-template-columns: minmax(0, 1fr) 200px;
  }

  .page-about .tl-item:nth-child(even) .tl-panel {
    order: 1;
  }

  .page-about .tl-item:nth-child(even) .tl-marker {
    order: 2;
    text-align: right;
  }

  .page-about .tl-panel::before {
    content: "";
    position: absolute;
    top: 46px;
    left: calc(-1 * clamp(28px, 3.6vw, 56px));
    width: clamp(28px, 3.6vw, 56px);
    height: 1px;
    background: var(--line-gold);
  }

  .page-about .tl-item:nth-child(even) .tl-panel::before {
    left: auto;
    right: calc(-1 * clamp(28px, 3.6vw, 56px));
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .reach-panel {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }

  .page-about .rules-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .team-side {
    position: sticky;
    top: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-panel,
  .page-about .collab-card,
  .page-about .ring-legend li {
    transition: none;
  }

  .page-about .tl-panel:hover,
  .page-about .collab-card:hover,
  .page-about .ring-legend li:hover {
    transform: none;
  }
}