.page-about {
  --about-soft: rgba(242, 238, 228, 0.72);
  --about-edge: 2px solid var(--line);
  --about-pad: 22px 18px;
  --about-glow: 0 0 14px rgba(255, 106, 26, 0.5);
  display: block;
  padding-bottom: var(--gap-l);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .breadcrumb-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}

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

.page-about .breadcrumb-current {
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: var(--gap-l) 0 0;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-s);
  padding-top: var(--gap-s);
}

.page-about .about-kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 11px;
  border: 2px solid var(--accent);
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.6vw, 52px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .about-lede {
  margin: 0 0 14px;
  max-width: 44ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--cream);
}

.page-about .about-lede--sub {
  color: var(--about-soft);
  font-size: 15px;
  border-left: 3px solid var(--cyan);
  padding-left: 14px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero-panel {
  position: relative;
  padding: var(--about-pad);
  background: var(--panel);
  border: var(--about-edge);
  box-shadow: var(--hard);
}

.page-about .about-hero-panel::after {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 46px;
  height: 4px;
  background: var(--grad);
}

.page-about .about-stats {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px;
  background: var(--panel-2);
}

.page-about .about-stat-num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat-label {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-sync-state {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--cream);
}

/* ---------- 时间轴 ---------- */
.page-about .about-axis {
  padding: var(--gap-l) 0 0;
}

.page-about .about-axis-list {
  position: relative;
  margin-top: var(--gap-l);
  display: grid;
  gap: var(--gap-l);
}

.page-about .about-axis-list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--line) 0 9px, transparent 9px 18px);
}

.page-about .about-node {
  position: relative;
  padding-left: 34px;
}

.page-about .about-node-dot {
  position: absolute;
  left: 4px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg), var(--about-glow);
  z-index: 1;
}

.page-about .about-node-year {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-node-card {
  position: relative;
}

.page-about .about-node-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-node-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-fold {
  margin-top: 14px;
  padding-top: 6px;
  border-top: 1px solid var(--line);
}

.page-about .about-fold summary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 6px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

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

.page-about .about-fold summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-about .about-fold[open] summary::before {
  content: "–";
  border-color: var(--accent);
  color: var(--accent);
}

.page-about .about-fold[open] summary {
  color: var(--accent);
}

.page-about .about-fold p {
  padding: 4px 0 2px;
  color: var(--about-soft);
}

.page-about .about-node-figure {
  margin-top: 20px;
}

/* ---------- 内容生产 ---------- */
.page-about .about-output {
  padding: var(--gap-l) 0 0;
}

.page-about .about-output-grid {
  margin-top: var(--gap-l);
}

.page-about .about-output-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: 700;
  line-height: 1.28;
  color: var(--cream);
}

.page-about .about-output-lead p,
.page-about .about-output-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-output-figure {
  margin-top: 20px;
}

.page-about .about-output-note h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-output-stat {
  background: var(--panel-2);
}

.page-about .about-output-stat--peak {
  background: var(--panel);
}

.page-about .about-big-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(36px, 10vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-big-num em {
  font-style: normal;
  font-size: 0.48em;
  color: var(--accent);
  vertical-align: super;
}

.page-about .about-big-label {
  margin: 12px 0 0;
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--gap-l) 0 0;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-s);
  margin-top: var(--gap-l);
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-copy > p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}

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

.page-about .about-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  background: var(--panel-2);
  border: var(--about-edge);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .about-role:hover {
  border-color: var(--accent);
  transform: translateX(2px);
}

.page-about .about-role-tag {
  align-self: start;
  padding: 4px 9px;
  border: 2px solid var(--cyan);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-role-body h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-role-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 同步能力 ---------- */
.page-about .about-sync {
  padding: var(--gap-l) 0 0;
}

.page-about .about-sync-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-l);
  margin-top: var(--gap-l);
}

.page-about .about-sync-copy > p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-sync-facts {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-sync-fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 16px;
  background: var(--panel-2);
}

.page-about .about-sync-num {
  flex: 0 0 auto;
  min-width: 62px;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .about-sync-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--cream);
}

.page-about .about-sync-tail {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-sync-diagram {
  padding: 18px;
  background: var(--panel);
  border: var(--about-edge);
  box-shadow: var(--hard-sm);
}

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

.page-about .about-sync-device rect {
  transition: stroke 180ms ease, fill 180ms ease;
}

.page-about .about-sync-device:hover rect {
  stroke: var(--accent);
  fill: #1B4237;
}

.page-about .about-sync-device text {
  pointer-events: none;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-eco {
  padding: var(--gap-l) 0 0;
}

.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-s);
  margin-top: var(--gap-l);
}

.page-about .about-eco-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-eco-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-eco-card--award {
  border-color: var(--warn);
  box-shadow: var(--hard-sm), inset 0 0 0 1px rgba(255, 209, 102, 0.18);
}

.page-about .about-eco-card--award h3 {
  color: var(--warn);
}

/* ---------- 服务地区 ---------- */
.page-about .about-region {
  padding: var(--gap-l) 0 0;
}

.page-about .about-region-inner {
  position: relative;
  padding: var(--about-pad);
  background: var(--panel);
  border: var(--about-edge);
  box-shadow: var(--hard);
  overflow: hidden;
}

.page-about .about-region-inner::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: var(--grad);
  opacity: 0.14;
  pointer-events: none;
}

.page-about .about-region-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-region-copy > p {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-region-list {
  margin: 0 0 22px;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-region-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-region-row dt {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-region-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--cream);
  word-break: break-word;
}

.page-about .about-region-note {
  margin: 0 0 22px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--warn);
}

.page-about .about-region-btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 自适应 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero-actions .btn,
  .page-about .about-region-btn {
    width: auto;
  }

  .page-about .about-role {
    grid-template-columns: 92px minmax(0, 1fr);
  }

  .page-about .about-region-row {
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-about {
    --about-pad: 28px 26px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: var(--gap-l);
    align-items: start;
  }

  .page-about .about-hero-panel {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-axis-list {
    gap: 34px;
  }

  .page-about .about-node {
    padding-left: 44px;
  }

  .page-about .about-node-dot {
    left: 6px;
    top: 10px;
  }

  .page-about .about-axis-list::before {
    left: 17px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.2fr);
    gap: var(--gap-l);
    align-items: start;
  }

  .page-about .about-sync-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: var(--gap-l);
  }

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

  .page-about .about-region-inner {
    padding: 34px 32px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    font-size: 52px;
  }

  .page-about .about-node-title {
    font-size: 23px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb-link,
  .page-about .about-role,
  .page-about .about-sync-device rect {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}