.page-about {
  --pa-primary: #1B3B6F;
  --pa-neon: #39FF14;
  --pa-accent: #FF6B35;
  --pa-bg: #121212;
  --pa-card: #0E1E36;
  --pa-text: #F5F5F0;
  --pa-dim: #A8A29E;
  --pa-light: #B0C4DE;
  background: var(--pa-bg);
  color: var(--pa-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

/* 章节间隔斜切色带 */
.page-about .about-band {
  height: 34px;
  background: linear-gradient(112deg, rgba(27,59,111,.8), rgba(57,255,20,.22) 70%, rgba(255,107,53,.5));
  clip-path: polygon(0 0, 100% 0, calc(100% - 46px) 100%, 46px 100%);
}

.page-about .about-hero {
  position: relative;
  padding: calc(var(--sp-xl) * 1.15) 0 var(--sp-xl);
  overflow: hidden;
  background:
    linear-gradient(112deg, rgba(27,59,111,.48) 0%, rgba(18,18,18,.9) 48%, var(--pa-bg) 100%),
    radial-gradient(circle at 82% 22%, rgba(57,255,20,.1), transparent 40%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--pa-neon), var(--pa-primary), var(--pa-accent));
}

.page-about .about-hero-inner {
  display: grid;
  gap: var(--sp-xl);
  align-items: center;
}

.page-about .about-hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-kicker {
  margin: var(--sp-md) 0 var(--sp-sm);
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--pa-dim);
}

.page-about .about-hero-title {
  margin: var(--sp-sm) 0 var(--sp-md);
  font-family: var(--font-heading);
  font-size: clamp(36px, 7vw, 64px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--pa-text);
}

.page-about .about-hero-lead {
  max-width: 58ch;
  margin: 0 0 var(--sp-lg);
  font-size: 17px;
  line-height: 1.72;
  color: var(--pa-dim);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
}

.page-about .about-chapter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-xs) var(--sp-xl);
  width: 100%;
  border-top: 1px solid rgba(176,196,222,.25);
  padding-top: var(--sp-md);
}

.page-about .about-chapter-nav a {
  color: var(--pa-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .about-chapter-nav a:hover {
  color: var(--pa-neon);
}

.page-about .chapter-num {
  font-family: var(--font-data);
  color: var(--pa-accent);
  margin-right: 4px;
}

/* 首屏视觉 */
.page-about .about-hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.page-about .about-hero-photo {
  display: block;
  width: 100%;
  margin: 0;
  overflow: hidden;
  clip-path: polygon(4% 0, 100% 0, 96% 100%, 0 100%);
}

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

.page-about .about-map-panel {
  position: relative;
  margin-top: -56px;
  margin-left: 6%;
  max-width: 360px;
  background: linear-gradient(160deg, rgba(14,30,54,.94), rgba(8,20,38,.96));
  border: 1px solid rgba(57,255,20,.35);
  padding: var(--sp-md) var(--sp-lg) var(--sp-sm);
  box-shadow: 0 18px 42px rgba(0,0,0,.55);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .map-panel-title {
  margin: 0 0 var(--sp-sm);
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--pa-neon);
}

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

.page-about .map-outline {
  fill: rgba(27,59,111,.42);
  stroke: var(--pa-neon);
  stroke-width: 2;
  stroke-dasharray: 8 5;
  filter: drop-shadow(0 0 6px rgba(57,255,20,.3));
}

.page-about .map-grid {
  stroke: rgba(176,196,222,.35);
  stroke-width: 1;
  stroke-dasharray: 4 7;
}

.page-about .map-city circle {
  fill: var(--pa-neon);
  stroke: var(--pa-bg);
  stroke-width: 2;
}

.page-about .map-city.is-primary circle {
  fill: var(--pa-accent);
}

.page-about .map-city-halo {
  fill: rgba(57,255,20,.16);
}

.page-about .map-city text {
  fill: var(--pa-text);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
}

.page-about .map-city-num {
  fill: var(--pa-neon);
  font-family: var(--font-data);
  font-size: 15px;
}

.page-about .map-panel-foot {
  margin: var(--sp-sm) 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--pa-dim);
}

/* ===== 全部章节共用标题节奏 ===== */
.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-md);
  margin-bottom: calc(var(--sp-lg) * 1.2);
}

.page-about .section-index {
  font-family: var(--font-data);
  font-size: clamp(48px, 8vw, 76px);
  line-height: .9;
  font-weight: 900;
  color: rgba(57,255,20,.55);
  text-shadow: 0 0 16px rgba(57,255,20,.3);
}

.page-about .section-subtitle {
  margin: 4px 0 6px;
  font-size: 13px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--pa-neon);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(28px, 4.8vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--pa-text);
}

/* ===== 01 本地中心 ===== */
.page-about .about-local {
  padding: var(--sp-xl) 0;
  background:
    radial-gradient(circle at 88% 18%, rgba(57,255,20,.07), transparent 34%),
    var(--pa-bg);
}

.page-about .about-local-layout {
  display: grid;
  gap: var(--sp-lg);
}

.page-about .about-local-copy p {
  max-width: 58ch;
  margin: 0 0 var(--sp-md);
  font-size: 16px;
  line-height: 1.74;
  color: var(--pa-dim);
}

.page-about .about-local-insight {
  display: grid;
  gap: var(--sp-md);
}

.page-about .about-local-data {
  background: linear-gradient(135deg, rgba(27,59,111,.62), rgba(14,30,54,.9));
  border-left: 3px solid var(--pa-neon);
  padding: var(--sp-md) var(--sp-lg);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: transform .25s ease, box-shadow .25s ease;
}

.page-about .about-local-data:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(57,255,20,.12);
}

.page-about .about-local-data .data-value {
  font-family: var(--font-data);
  font-size: 32px;
  font-weight: 700;
  color: var(--pa-neon);
}

.page-about .about-local-data .data-unit {
  margin-left: 4px;
  font-size: 14px;
  color: var(--pa-light);
}

.page-about .about-local-data .data-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--pa-dim);
}

/* ===== 02 起点与成长 ===== */
.page-about .about-journey {
  padding: var(--sp-xl) 0;
  background:
    linear-gradient(rgba(27,59,111,.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27,59,111,.1) 1px, transparent 1px),
    var(--pa-bg);
  background-size: 44px 44px;
  border-top: 2px solid rgba(57,255,20,.22);
  border-bottom: 2px solid rgba(57,255,20,.22);
}

.page-about .about-timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
}

.page-about .timeline-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: var(--sp-md);
  padding-bottom: var(--sp-lg);
}

.page-about .timeline-rail {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .timeline-rail::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--pa-neon), var(--pa-primary));
}

.page-about .timeline-item:last-child .timeline-rail::before {
  display: none;
}

.page-about .timeline-dot {
  position: relative;
  z-index: 1;
  width: 16px;
  height: 16px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--pa-neon);
  box-shadow: 0 0 0 4px rgba(57,255,20,.18);
}

.page-about .timeline-card {
  background: linear-gradient(135deg, rgba(27,59,111,.55), rgba(14,30,54,.85));
  padding: var(--sp-md) var(--sp-lg);
  border-left: 2px solid var(--pa-accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .timeline-year {
  font-family: var(--font-data);
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--pa-neon);
}

.page-about .timeline-card h3 {
  margin: 4px 0 8px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--pa-text);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.66;
  color: var(--pa-dim);
}

.page-about .timeline-detail {
  display: block;
  margin-top: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  background: rgba(176,196,222,.08);
  border-left: 1px solid var(--pa-neon);
  font-size: 14px;
  line-height: 1.6;
  color: var(--pa-light);
}

.page-about .timeline-detail p {
  margin: 0;
}

.page-about .timeline-more {
  display: block;
  margin-top: 10px;
  padding: 6px 14px;
  background: none;
  border: 1px solid rgba(57,255,20,.4);
  color: var(--pa-neon);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  transition: background-color .2s ease;
}

.page-about .timeline-more:hover {
  background: rgba(57,255,20,.1);
}

/* ===== 03 覆盖范围 ===== */
.page-about .about-coverage {
  padding: var(--sp-xl) 0;
  background:
    radial-gradient(circle at 84% 10%, rgba(255,107,53,.06), transparent 30%),
    var(--pa-bg);
}

.page-about .about-city-grid {
  display: grid;
  gap: var(--sp-md);
}

.page-about .city-card {
  position: relative;
  background: linear-gradient(135deg, var(--pa-card), #0b1730);
  padding: var(--sp-lg) var(--sp-md);
  border: 1px solid rgba(27,59,111,.6);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .city-card:hover {
  border-color: rgba(57,255,20,.6);
  transform: translateX(6px);
}

.page-about .city-name {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 26px;
  color: var(--pa-text);
}

.page-about .city-desc {
  margin: 0 0 var(--sp-sm);
  font-size: 14px;
  line-height: 1.6;
  color: var(--pa-dim);
}

.page-about .city-count {
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 700;
  color: var(--pa-neon);
}

.page-about .about-facts-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-sm);
  margin-top: var(--sp-xl);
  border-top: 1px solid rgba(176,196,222,.2);
  border-bottom: 1px solid rgba(176,196,222,.2);
  padding: var(--sp-lg) 0;
}

.page-about .fact-item {
  display: flex;
  flex-direction: column;
}

.page-about .fact-num {
  font-family: var(--font-data);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  color: var(--pa-neon);
}

.page-about .fact-unit {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--pa-dim);
}

.page-about .about-coverage-bottom {
  display: grid;
  gap: var(--sp-lg);
  margin-top: var(--sp-xl);
}

.page-about .about-coverage-photo {
  display: block;
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 18px 100%);
}

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

.page-about .about-coverage-note {
  padding: var(--sp-md) var(--sp-lg);
  border-left: 3px solid var(--pa-accent);
  background: rgba(27,59,111,.32);
  font-size: 15px;
  line-height: 1.7;
  color: var(--pa-light);
}

.page-about .about-coverage-note p {
  margin: 0 0 var(--sp-sm);
}

.page-about .about-coverage-note p:last-child {
  margin-bottom: 0;
}

/* ===== 04 数据与团队 ===== */
.page-about .about-team {
  padding: var(--sp-xl) 0;
  background: linear-gradient(180deg, var(--pa-bg), #0a1526);
}

.page-about .about-team-layout {
  display: grid;
  gap: var(--sp-lg);
}

.page-about .about-team-photo {
  display: block;
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 100%, 8px 100%);
}

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

.page-about .about-team-copy p {
  color: var(--pa-dim);
  line-height: 1.76;
  margin: 0 0 var(--sp-md);
}

.page-about .about-team-roles {
  list-style: none;
  margin: 0 0 var(--sp-lg);
  padding: 0;
  border-top: 1px solid rgba(176,196,222,.2);
}

.page-about .about-team-roles li {
  position: relative;
  padding: var(--sp-sm) 0 var(--sp-sm) 2em;
  border-bottom: 1px solid rgba(176,196,222,.2);
  font-size: 15px;
  line-height: 1.6;
  color: var(--pa-light);
}

.page-about .about-team-roles li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 21px;
  width: 9px;
  height: 9px;
  background: var(--pa-neon);
  transform: rotate(45deg);
}

.page-about .about-cert {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
}

.page-about .about-cert .tag {
  padding: 8px 16px;
  background: rgba(27,59,111,.6);
  border: 1px solid rgba(176,196,222,.3);
  color: var(--pa-light);
  font-size: 13px;
}

.page-about .about-cert .tag-hot {
  border-color: rgba(255,107,53,.55);
  color: var(--pa-accent);
}

/* ===== 尾幕 ===== */
.page-about .about-outro {
  padding: var(--sp-xl) 0;
  background:
    linear-gradient(115deg, rgba(27,59,111,.85), rgba(10,21,38,.95) 70%);
}

.page-about .about-outro-inner {
  max-width: 820px;
}

.page-about .about-outro-trust {
  margin: 0 0 var(--sp-lg);
  padding-left: var(--sp-lg);
  border-left: 5px solid var(--pa-neon);
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: 1.62;
  color: var(--pa-text);
}

.page-about .about-outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
}

.page-about .about-outro-links a {
  padding: 8px 18px;
  border: 1px solid rgba(57,255,20,.45);
  color: var(--pa-neon);
  font-size: 14px;
  text-decoration: none;
  transition: background-color .2s ease;
}

.page-about .about-outro-links a:hover {
  background: rgba(57,255,20,.1);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 720px) {
  .page-about .about-facts-strip {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-city-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-local-insight {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-inner {
    grid-template-columns: 1.05fr 1fr;
    min-height: 580px;
  }

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

  .page-about .about-map-panel {
    align-self: end;
    margin-right: 5%;
    margin-left: auto;
    margin-top: -90px;
  }

  .page-about .about-local-layout {
    grid-template-columns: 1.1fr .9fr;
    align-items: start;
  }

  .page-about .about-local-insight {
    grid-template-columns: 1fr;
  }

  .page-about .about-coverage-bottom {
    grid-template-columns: 1.2fr .8fr;
    align-items: center;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

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

  .page-about .city-card:nth-child(4) {
    grid-column: 2 / 3;
  }

  /* 时间轴左右交替 */
  .page-about .timeline-item {
    grid-template-columns: 1fr 48px 1fr;
    gap: var(--sp-md);
  }

  .page-about .timeline-rail {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .timeline-card {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    grid-column: 1;
  }

  .page-about .timeline-item:nth-child(even) .timeline-rail::before {
    background: linear-gradient(to bottom, var(--pa-primary), var(--pa-neon));
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    text-align: right;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card .timeline-detail {
    text-align: left;
  }

  .page-about .timeline-item:nth-child(even) .timeline-more {
    margin-left: auto;
  }

  .page-about .timeline-item:nth-child(even) .timeline-more {
    margin-right: 0;
    text-align: left;
  }

  .page-about .about-outro-trust {
    font-size: 24px;
  }
}