.page-about {
  --about-rail: 190px;
  background: var(--ink-800);
  color: var(--text-night);
  overflow-x: hidden;
  padding-bottom: clamp(40px, 7vw, 84px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(84px, 13vw, 148px);
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(120% 95% at 88% -12%, rgba(51, 240, 208, 0.17), transparent 58%),
    radial-gradient(95% 80% at -5% 8%, rgba(255, 106, 43, 0.13), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 180, 194, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 180, 194, 0.075) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 76%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 56px;
  background: var(--ink-900);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  opacity: 0.55;
  pointer-events: none;
}

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

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0 0 clamp(22px, 4vw, 40px);
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .breadcrumb-list li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin: 0 9px;
  color: rgba(168, 180, 194, 0.45);
}

.page-about .breadcrumb-link {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(30px, 5vw, 58px);
}

.page-about .about-kicker {
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 74px);
  line-height: 1.02;
  letter-spacing: 0.005em;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  color: var(--warm-white);
}

.page-about .about-lead {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(234, 241, 247, 0.84);
  max-width: 48ch;
}

.page-about .about-hero-facts {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(168, 180, 194, 0.2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-hero-facts li {
  background: var(--ink-700);
  padding: clamp(16px, 2.6vw, 24px) clamp(14px, 2.2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 92px;
  justify-content: flex-end;
}

.page-about .about-hero-facts .data-num {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-hero-facts li:nth-child(4) .data-num {
  color: var(--ember);
}

.page-about .fact-plus {
  font-size: 0.55em;
  margin-left: 2px;
}

.page-about .fact-unit {
  font-size: 0.44em;
  margin-left: 2px;
  color: var(--silver);
}

.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--silver);
  line-height: 1.4;
}

/* ---------- 堆叠面板 ---------- */
.page-about .about-stack {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  padding-top: clamp(30px, 5vw, 56px);
}

.page-about .about-panel {
  position: relative;
  display: grid;
  gap: clamp(16px, 3vw, 30px);
  padding: clamp(24px, 3.6vw, 44px) clamp(18px, 3.2vw, 42px);
  background: var(--ink-700);
  color: var(--text-night);
}

.page-about .about-panel::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: var(--cut);
  height: var(--cut);
  background: var(--ink-800);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-panel--night {
  background: var(--ink-900);
}

.page-about .about-panel--paper {
  background: var(--paper);
  color: var(--text-paper);
}

.page-about .about-panel--paper::after {
  background: var(--ink-800);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-num {
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 0.9;
  color: var(--cyan);
  opacity: 0.85;
}

.page-about .about-panel--paper .about-num {
  color: var(--ember);
  opacity: 1;
}

.page-about .about-rail .label {
  color: var(--silver);
}

.page-about .about-panel--paper .about-rail .label {
  color: rgba(26, 34, 51, 0.55);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 36px);
  line-height: 1.18;
  letter-spacing: 0.005em;
  margin: 0 0 0.55em;
  color: var(--warm-white);
}

.page-about .about-panel--paper .about-h2 {
  color: var(--text-paper);
}

.page-about .about-h3 {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  margin: 1.4em 0 0.5em;
  color: var(--warm-white);
}

.page-about .about-panel--paper .about-h3 {
  color: var(--text-paper);
}

.page-about .about-body p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.78;
  max-width: 64ch;
  color: rgba(234, 241, 247, 0.86);
}

.page-about .about-panel--paper .about-body p {
  color: #2B3547;
}

.page-about .about-panel-lead {
  font-size: clamp(16px, 1.9vw, 18px) !important;
  line-height: 1.7 !important;
  color: var(--cyan) !important;
  max-width: 56ch !important;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  margin-bottom: 1.2em !important;
}

.page-about .about-panel--paper .about-panel-lead {
  color: #1F2A3D !important;
  border-left-color: var(--ember);
}

.page-about .about-note {
  font-size: 14px !important;
  line-height: 1.7 !important;
  color: var(--silver) !important;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 1.4em !important;
}

/* ---------- 斜切分隔带 ---------- */
.page-about .about-slant {
  margin: clamp(6px, 1.4vw, 12px) 0;
  padding: clamp(28px, 4.6vw, 52px) 0;
  background:
    linear-gradient(102deg, var(--ink-900) 0%, var(--ink-700) 52%, rgba(255, 106, 43, 0.22) 100%);
  clip-path: polygon(0 20px, 100% 0, 100% calc(100% - 20px), 0 100%);
}

.page-about .about-slant--alt {
  background:
    linear-gradient(102deg, rgba(51, 240, 208, 0.16) 0%, var(--ink-700) 46%, var(--ink-900) 100%);
}

.page-about .about-slant-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px clamp(20px, 4vw, 48px);
}

.page-about .about-slant-line {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.8vw, 28px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--warm-white);
  flex: 1 1 240px;
}

.page-about .about-slant-metric {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex: 0 1 auto;
}

.page-about .about-slant-metric .data-num {
  font-size: clamp(38px, 6.4vw, 66px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-slant--alt .about-slant-metric .data-num {
  color: var(--ember);
}

.page-about .about-slant-metric span {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--silver);
  max-width: 12ch;
}

.page-about .metric-unit {
  font-size: 0.46em !important;
  letter-spacing: 0 !important;
  max-width: none !important;
  margin-left: 2px;
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
  margin: 1.4em 0;
}

.page-about .about-team-chart {
  max-width: 220px;
  margin: 0 auto;
}

.page-about .team-donut {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .team-donut .donut-total {
  font-family: var(--font-data);
  font-size: 34px;
  font-weight: 700;
  fill: var(--warm-white);
}

.page-about .team-donut .donut-unit {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.16em;
  fill: var(--silver);
}

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

.page-about .role {
  padding: 14px 16px;
  background: rgba(5, 13, 26, 0.4);
  border-left: 3px solid var(--silver);
}

.page-about .role--cyan {
  border-left-color: var(--cyan);
}

.page-about .role--ember {
  border-left-color: var(--ember);
}

.page-about .role--silver {
  border-left-color: var(--silver);
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .role-head .data-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--warm-white);
}

.page-about .role--cyan .role-head .data-num {
  color: var(--cyan);
}

.page-about .role--ember .role-head .data-num {
  color: var(--ember);
}

.page-about .role-head span {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--warm-white);
}

.page-about .role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(234, 241, 247, 0.74);
  max-width: none;
}

/* ---------- 图片 ---------- */
.page-about .about-shot {
  margin: 1.6em 0 0;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  background: var(--ink-900);
}

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

.page-about .about-shot figcaption {
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--silver);
  padding: 12px 2px 0;
  margin: 0;
}

.page-about .about-panel--paper .about-shot figcaption {
  color: rgba(26, 34, 51, 0.62);
}

/* ---------- 阶段 ---------- */
.page-about .about-phases {
  list-style: none;
  margin: 1.4em 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .phase {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .phase-tag {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.page-about .phase:nth-child(2) .phase-tag {
  background: var(--ember);
  color: var(--warm-white);
}

.page-about .phase:nth-child(3) .phase-tag {
  background: var(--silver);
}

.page-about .phase:nth-child(4) .phase-tag {
  background: var(--warm-white);
}

.page-about .phase-text h3 {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--warm-white);
  letter-spacing: 0.01em;
}

.page-about .phase-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(234, 241, 247, 0.78);
  max-width: 58ch;
}

/* ---------- 城市网络 ---------- */
.page-about .about-map-wrap {
  margin: 1.6em 0 1em;
  padding: 14px;
  background: rgba(18, 38, 63, 0.55);
  border: 1px solid rgba(26, 34, 51, 0.12);
}

.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .map-node circle {
  fill: var(--cyan);
  fill-opacity: 0.85;
  transition: fill-opacity 0.2s var(--ease), r 0.2s var(--ease);
}

.page-about .map-node--hot circle {
  fill: var(--ember);
}

.page-about .map-node text {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.02em;
  fill: #1F2A3D;
  opacity: 0;
  transition: opacity 0.2s var(--ease);
  pointer-events: none;
}

.page-about .map-node:hover circle,
.page-about .map-node:focus-visible circle {
  fill-opacity: 1;
}

.page-about .map-node:hover text,
.page-about .map-node:focus-visible text {
  opacity: 1;
}

.page-about .map-node:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 2px;
}

.page-about .about-map-note {
  font-size: 13px !important;
  line-height: 1.65 !important;
  color: rgba(26, 34, 51, 0.66) !important;
  margin: 10px 0 0 !important;
}

/* ---------- 内容流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 1.3em 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .flow-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.page-about .about-flow li:nth-child(2) .flow-index {
  background: var(--ember);
  color: var(--warm-white);
}

.page-about .about-flow li:nth-child(3) .flow-index {
  background: var(--silver);
}

.page-about .about-flow h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--warm-white);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(234, 241, 247, 0.78);
  max-width: 58ch;
}

/* ---------- 报告 ---------- */
.page-about .about-report {
  margin-top: 1.4em;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--paper-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-report-head .label {
  color: rgba(26, 34, 51, 0.5);
}

.page-about .about-report-head h3 {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 700;
  margin: 6px 0 10px;
  color: var(--text-paper);
}

.page-about .about-report p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #2B3547;
  max-width: 58ch;
}

.page-about .about-report-metrics {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid rgba(26, 34, 51, 0.18);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 12px;
}

.page-about .about-report-metrics li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-report-metrics .data-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--ember);
}

.page-about .about-report-metrics li span:last-child {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(26, 34, 51, 0.62);
}

/* ---------- 下一页入口 ---------- */
.page-about .about-next {
  padding-top: clamp(40px, 6vw, 72px);
}

.page-about .about-next .about-h2 {
  color: var(--warm-white);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(168, 180, 194, 0.2);
  grid-template-columns: 1fr;
}

.page-about .about-next-list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 26px) clamp(16px, 2.4vw, 24px);
  background: var(--ink-700);
  text-decoration: none;
  min-height: 88px;
  justify-content: center;
  transition: background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next-list a:hover,
.page-about .about-next-list a:focus-visible {
  background: var(--ink-900);
  transform: translateX(4px);
}

.page-about .about-next-list a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .next-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .next-desc {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(234, 241, 247, 0.72);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team-grid {
    grid-template-columns: 200px minmax(0, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .about-panel {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-about .phase {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 22px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-next-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-slant-line,
  .page-about .about-slant-metric {
    animation: aboutSlideIn 0.48s var(--ease) both;
  }

  .page-about .about-slant-metric {
    animation-delay: 0.08s;
  }

  @keyframes aboutSlideIn {
    from {
      opacity: 0;
      transform: translateY(14px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}
<<<END>>>