.page-about {
  --about-line: rgba(20, 24, 29, .12);
  --about-line-dark: rgba(145, 166, 178, .26);
  background: var(--sand);
  color: var(--graphite);
  overflow-x: hidden;
}

.page-about .container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--edge);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(48px, 8vw, 96px);
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(145, 166, 178, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(145, 166, 178, .10) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--sand);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6%;
  top: -12%;
  width: 42%;
  height: 68%;
  background: linear-gradient(160deg, rgba(242, 78, 30, .30), rgba(123, 30, 43, .06) 72%);
  clip-path: polygon(46% 0, 100% 0, 100% 100%, 0 82%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .crumb {
  margin-bottom: 18px;
}

.page-about .crumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .crumb-item + .crumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--cyan);
}

.page-about .crumb-link {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

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

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(34px, 8vw, 84px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-title-mark {
  display: inline-block;
  margin-top: 6px;
  color: var(--orange);
  -webkit-text-stroke: 0;
}

.page-about .about-lede {
  max-width: 46em;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(247, 242, 232, .82);
}

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

.page-about .about-hero-aside {
  position: relative;
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-slab {
  position: relative;
  background: var(--orange);
  color: var(--ink);
  padding: 26px 24px 30px;
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
}

.page-about .about-slab-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(56px, 12vw, 88px);
  line-height: .88;
  letter-spacing: -.04em;
}

.page-about .about-slab-label {
  margin: 6px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .04em;
}

.page-about .about-slab-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: rgba(10, 26, 47, .78);
}

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

.page-about .about-facts li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-fact-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -.02em;
}

.page-about .about-fact-text {
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(247, 242, 232, .76);
}

.page-about .about-vertical {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--slate);
  writing-mode: vertical-rl;
  padding-left: 4px;
  display: none;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(44px, 8vw, 104px) 0;
}

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-rail {
  position: relative;
}

.page-about .about-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(40px, 9vw, 76px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--orange);
}

.page-about .about-num--dark {
  color: var(--lime);
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-h2--light {
  color: var(--white);
}

.page-about .about-h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-rail-note {
  margin: 0;
  max-width: 26em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(20, 24, 29, .66);
}

.page-about .about-rotate {
  display: none;
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--slate);
}

/* ---------- 01 年表 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-jump-label {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .about-jump a {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--about-line);
  transition: border-color .18s ease, color .18s ease, transform .18s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  border-color: var(--cyan);
  color: var(--teal);
  transform: translateY(-2px);
}

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

.page-about .about-stage {
  position: relative;
  margin-left: 6px;
  padding: 14px 0 26px 22px;
  border-left: 2px solid var(--about-line);
  scroll-margin-top: 120px;
  transition: background-color .2s ease, border-color .2s ease;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 24px;
  width: 16px;
  height: 16px;
  background: var(--sand);
  border: 2px solid var(--orange);
}

.page-about .about-stage:target {
  background: rgba(22, 217, 227, .08);
  border-left-color: var(--cyan);
}

.page-about .about-stage:target::before {
  background: var(--cyan);
  border-color: var(--teal);
}

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

.page-about .about-stage-year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(36px, 8vw, 60px);
  line-height: 1;
  letter-spacing: -.05em;
  color: rgba(242, 78, 30, .22);
}

.page-about .about-stage-version {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--teal);
  border: 1px solid var(--about-line);
  padding: 2px 8px;
}

.page-about .about-stage-title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-stage-body {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(20, 24, 29, .74);
}

.page-about .about-collage {
  margin: 28px 0 0;
}

.page-about .about-collage img,
.page-about .about-engine-media img,
.page-about .about-network-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .img-caption {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(20, 24, 29, .58);
}

/* ---------- 02 双引擎 ---------- */
.page-about .about-engine {
  background: var(--white);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-engine-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-engine-text p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(20, 24, 29, .76);
}

.page-about .about-engine-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-engine-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--about-line);
  font-size: 14px;
  color: rgba(20, 24, 29, .74);
}

.page-about .about-engine-key {
  flex: none;
  min-width: 58px;
  font-size: 18px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -.02em;
}

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

/* ---------- 03 城市网络 ---------- */
.page-about .about-network {
  background: var(--teal);
  color: var(--sand);
  background-image:
    linear-gradient(rgba(22, 217, 227, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 217, 227, .07) 1px, transparent 1px);
  background-size: 56px 56px;
}

.page-about .about-network-head {
  max-width: 46em;
  margin-bottom: 26px;
}

.page-about .about-network-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 242, 232, .76);
}

.page-about .about-map {
  position: relative;
  height: 260px;
  border: 1px solid var(--about-line-dark);
  background-image: radial-gradient(rgba(22, 217, 227, .22) 1px, transparent 1px);
  background-size: 20px 20px;
  overflow: hidden;
}

.page-about .about-node {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 7px;
  transform: translate(-50%, -50%);
}

.page-about .about-node-dot {
  display: block;
  width: 10px;
  height: 10px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(22, 217, 227, .16);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .about-node-dot--wine {
  background: var(--wine);
  box-shadow: 0 0 0 4px rgba(123, 30, 43, .35);
}

.page-about .about-node-name {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(247, 242, 232, .76);
  white-space: nowrap;
  transition: color .18s ease;
}

.page-about .about-node:hover .about-node-dot {
  transform: scale(1.4);
  box-shadow: 0 0 0 8px rgba(22, 217, 227, .22);
}

.page-about .about-node:hover .about-node-name {
  color: var(--lime);
}

.page-about .about-node--n1 { left: 60%; top: 42%; }
.page-about .about-node--n2 { left: 56%; top: 20%; }
.page-about .about-node--n3 { left: 72%; top: 50%; }
.page-about .about-node--n4 { left: 48%; top: 74%; }
.page-about .about-node--n5 { left: 26%; top: 56%; }
.page-about .about-node--n6 { left: 44%; top: 56%; }
.page-about .about-node--n7 { left: 34%; top: 32%; }
.page-about .about-node--n8 { left: 66%; top: 14%; }
.page-about .about-node--n9 { left: 16%; top: 82%; }

.page-about .about-network-foot {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 12.5px;
  color: rgba(247, 242, 232, .72);
}

.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-legend-dot {
  width: 9px;
  height: 9px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-legend-dot--wine { background: var(--wine); }
.page-about .about-legend-dot--lime { background: var(--lime); }

.page-about .about-network-stats {
  display: grid;
  gap: 16px;
}

.page-about .about-network-stat {
  padding: 16px 18px;
  border-left: 2px solid var(--cyan);
  background: rgba(10, 26, 47, .42);
}

.page-about .about-network-num {
  margin: 0;
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.03em;
}

.page-about .about-network-cap {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 242, 232, .74);
}

.page-about .about-network-figure {
  margin: 28px 0 0;
}

.page-about .about-network-figure .img-caption {
  color: rgba(247, 242, 232, .6);
}

/* ---------- 04 周期 ---------- */
.page-about .about-cycle-lede {
  margin: 0 0 24px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(20, 24, 29, .78);
}

.page-about .about-cycle-lede strong {
  color: var(--ink);
  font-weight: 800;
  border-bottom: 2px solid var(--cyan);
}

.page-about .about-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--about-line);
  background: var(--white);
}

.page-about .about-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 13.5px;
  color: rgba(20, 24, 29, .78);
}

.page-about .about-table caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--teal);
  background: rgba(22, 217, 227, .08);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  font-weight: 600;
  color: var(--ink);
  background: var(--teal);
  color: var(--sand);
}

.page-about .about-table tbody th {
  font-weight: 800;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-table tbody tr:hover {
  background: rgba(242, 78, 30, .05);
}

.page-about .about-cell-num {
  font-size: 17px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-about .about-cycle-note {
  margin: 16px 0 0;
  max-width: 42em;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(20, 24, 29, .62);
}

.page-about .about-cycle-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 05 资质 ---------- */
.page-about .about-honor {
  background: var(--white);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-table--honor tbody th {
  white-space: normal;
  font-weight: 700;
}

.page-about .about-honor-cards {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-honor-card {
  padding: 20px;
  background: var(--sand);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--orange);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.page-about .about-honor-card:hover {
  border-color: var(--cyan);
  border-top-color: var(--orange);
  box-shadow: 0 6px 18px rgba(10, 26, 47, .08);
}

.page-about .about-honor-k {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--teal);
}

.page-about .about-honor-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(20, 24, 29, .7);
}

/* ---------- 06 收尾 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--sand);
  background-image:
    linear-gradient(rgba(145, 166, 178, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(145, 166, 178, .08) 1px, transparent 1px);
  background-size: 48px 48px;
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-about .about-cta-inner {
  position: relative;
}

.page-about .about-cta-inner::before {
  content: "";
  position: absolute;
  left: calc(var(--edge) * -1);
  top: 6px;
  width: 48px;
  height: 3px;
  background: var(--orange);
}

.page-about .about-cta-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-about .about-cta-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(30px, 7vw, 68px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-cta-lede {
  margin: 0 0 28px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 242, 232, .74);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero-aside {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-slab {
    grid-row: span 2;
  }

  .page-about .about-vertical {
    display: block;
    position: absolute;
    right: -6px;
    bottom: -8px;
  }

  .page-about .about-map {
    height: 320px;
  }

  .page-about .about-network-foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero-aside {
    grid-template-columns: 1fr;
    gap: 22px;
    padding-top: 46px;
  }

  .page-about .about-slab {
    grid-row: auto;
    clip-path: polygon(0 0, 100% 0, 100% 84%, 0 100%);
    padding: 30px 28px 40px;
  }

  .page-about .about-vertical {
    right: auto;
    left: -34px;
    bottom: 0;
    top: auto;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rotate {
    display: block;
    writing-mode: vertical-rl;
    height: 150px;
    margin-top: 26px;
  }

  .page-about .about-stage {
    padding-left: 28px;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: 40px;
  }

  .page-about .about-engine-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-engine-media {
    margin-top: -32px;
  }

  .page-about .about-map {
    height: 380px;
  }

  .page-about .about-cta-inner {
    padding-left: clamp(0px, 4vw, 48px);
  }

  .page-about .about-cta-title {
    max-width: 14em;
  }
}

@media (min-width: 1200px) {
  .page-about .about-stage-year {
    font-size: 64px;
  }

  .page-about .about-network-stats {
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}
<<<END>>>