.page-about {
  --about-panel: rgba(27, 22, 56, 0.42);
  --about-panel-soft: rgba(27, 22, 56, 0.6);
  --about-fill: rgba(11, 27, 43, 0.55);
}

.page-about .about-crumb {
  padding: clamp(18px, 3vw, 28px) 0 clamp(4px, 1vw, 10px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding: clamp(18px, 3vw, 32px) 0 clamp(34px, 5vw, 68px);
}

.page-about .hero-kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.022em;
  font-weight: 800;
  color: var(--snow);
  max-width: 15em;
}

.page-about .hero-lead {
  margin: 0;
  max-width: 42em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 22px);
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3.6vw, 33px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--snow);
}

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

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

.page-about .about-media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-media--hero { aspect-ratio: 14 / 9; }
.page-about .about-media--team { aspect-ratio: 5 / 3; }
.page-about .about-media--flow { aspect-ratio: 9 / 7; }

.page-about .hero-figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  padding: clamp(14px, 2vw, 20px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px clamp(14px, 2.4vw, 30px);
}

.page-about .about-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 4px 0;
  font-size: 13.5px;
  letter-spacing: 0.08em;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .about-index-list a::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--saffron);
  transform: rotate(45deg);
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--snow);
  border-bottom-color: var(--gold);
}

/* ---------- 章节基座 ---------- */
.page-about .sec {
  scroll-margin-top: 96px;
  padding: clamp(36px, 5.5vw, 74px) 0;
  border-top: 1px solid var(--line);
}

.page-about .sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 18px;
  margin-bottom: 14px;
}

.page-about .sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .sec-head h2 {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 37px);
  line-height: 1.16;
  letter-spacing: -0.018em;
  font-weight: 800;
  color: var(--snow);
}

.page-about .sec-intro {
  margin: 0;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

/* ---------- 起点与方向 ---------- */
.page-about .origin-grid {
  margin-top: clamp(20px, 3vw, 34px);
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .origin-copy p {
  margin: 0 0 18px;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--silver);
}

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

.page-about .cat-panel {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--saffron);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--about-panel-soft), var(--about-fill));
}

.page-about .cat-panel h3 {
  margin: 0 0 16px;
  font-size: 12.5px;
  letter-spacing: 0.2em;
  font-weight: 700;
  color: var(--gold);
}

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

.page-about .cat-list li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 2px 10px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .cat-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .cat-idx {
  grid-row: span 2;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ice);
  padding-top: 3px;
}

.page-about .cat-name {
  font-size: 14.5px;
  color: var(--snow);
  letter-spacing: 0.02em;
}

.page-about .cat-desc {
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  position: relative;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(198, 40, 40, 0.5) 60%, transparent);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 32px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-dot {
  position: absolute;
  left: 1px;
  top: 4px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--line-strong);
  background: var(--night);
  transform: rotate(45deg);
  transition: border-color var(--speed) var(--ease), background-color var(--speed) var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  border-color: var(--gold);
  background: rgba(212, 160, 23, 0.25);
}

.page-about .tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 9px;
}

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

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.1vw, 22px);
  font-weight: 700;
  letter-spacing: -0.012em;
  color: var(--snow);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 团队与协作 ---------- */
.page-about .team-grid {
  margin-top: clamp(20px, 3vw, 34px);
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

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

.page-about .figure-note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--jade);
  font-size: 13px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .node-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .node-card {
  padding: clamp(18px, 2.2vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--about-panel-soft), var(--about-fill));
  transition: border-color var(--speed) var(--ease);
}

.page-about .node-card::before {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  margin-bottom: 14px;
  background: var(--saffron);
}

.page-about .node-card:hover {
  border-color: var(--line-gold);
}

.page-about .node-city {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 9px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--snow);
}

.page-about .node-city .data-num {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .node-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 数据流转 ---------- */
.page-about .flow-grid {
  margin-top: clamp(20px, 3vw, 34px);
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .flow-media {
  margin: 0;
}

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

.page-about .src-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .src-idx {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ice);
}

.page-about .src-list h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .src-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .verify-bar {
  margin-top: 20px;
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(198, 40, 40, 0.16), rgba(11, 27, 43, 0.14));
  display: grid;
  gap: 9px;
}

.page-about .verify-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .verify-bar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--snow);
}

.page-about .perf-strip {
  margin-top: clamp(24px, 3.4vw, 42px);
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .perf-item {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--about-panel-soft);
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .perf-label {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  margin-top: clamp(20px, 3vw, 32px);
  display: grid;
  gap: 14px;
}

.page-about .partner-card {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  border-radius: var(--radius);
  background: var(--about-panel);
  transition: background-color var(--speed) var(--ease);
}

.page-about .partner-card:hover {
  background: var(--about-panel-soft);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.6vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--snow);
}

.page-about .partner-kind {
  margin: 12px 0 9px;
  font-size: 13.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .partner-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .honor-list {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .honor-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-fill);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--snow);
}

.page-about .honor-list .data-num {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .partner-tail {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 48em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .partner-tail a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-about .partner-tail a:hover,
.page-about .partner-tail a:focus-visible {
  color: var(--snow);
  border-bottom-color: var(--gold);
}

/* ---------- 服务地区与备案 ---------- */
.page-about .region-panel {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(27, 22, 56, 0.72), var(--about-fill));
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .region-facts {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .region-facts > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .region-facts dt {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .region-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.62;
  color: var(--snow);
  overflow-wrap: anywhere;
}

.page-about .region-facts dd a {
  color: var(--snow);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .region-facts dd a:hover,
.page-about .region-facts dd a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .region-cta {
  display: flex;
  align-items: center;
}

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

@media (min-width: 700px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .flow-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }

  .page-about .region-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .tl-item {
    padding-left: 40px;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-media img,
  .page-about .tl-dot,
  .page-about .node-card,
  .page-about .partner-card {
    transition: none;
  }
}