.page-about {
  --about-idx-w: 236px;
  --about-shadow: 6px 6px 0 rgba(0, 0, 0, 0.6);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.42;
  filter: grayscale(0.3) contrast(1.06);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(158deg, rgba(7, 16, 14, 0.5) 0%, rgba(7, 16, 14, 0.9) 58%, var(--ink) 100%);
}

.page-about .about-hero-body {
  position: relative;
  z-index: 2;
  padding-block: 36px 54px;
}

.page-about .about-hero .eyebrow {
  margin: 30px 0 0;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 15em;
  font-family: var(--ff-display);
  font-size: clamp(30px, 6.6vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.9;
}

.page-about .hero-facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid rgba(39, 245, 200, 0.26);
}

.page-about .hero-facts li {
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.07em;
  color: var(--muted);
  padding-right: 18px;
  margin-right: 18px;
  border-right: 1px solid var(--line);
  margin-bottom: 6px;
}

.page-about .hero-facts li:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

.page-about .hero-facts .mono {
  display: inline-block;
  margin-right: 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0;
}

/* ---------- 外壳：左索引 + 右画布 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  align-items: start;
  gap: 0;
}

.page-about .about-index {
  padding-block: 26px;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

.page-about .index-head {
  margin: 0 0 12px;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .index-list li {
  flex: 0 0 auto;
}

.page-about .index-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  white-space: nowrap;
  text-decoration: none;
  font-size: 13px;
  color: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(20, 48, 41, 0.5);
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--white);
  outline: none;
}

.page-about .index-list .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-canvas {
  min-width: 0;
  background: var(--ink-2);
}

.page-about .sec {
  padding: 40px clamp(16px, 3.4vw, 40px) 48px;
  border-top: 1px solid var(--line);
}

.page-about .sec:first-child {
  border-top: 0;
}

.page-about .sec-net {
  background: var(--ink);
}

.page-about .sec-team {
  background: var(--panel);
}

.page-about .sec-eco {
  background: linear-gradient(180deg, var(--wine) 0%, var(--ink-2) 82%);
}

/* ---------- 区块标题 ---------- */
.page-about .sec-head {
  margin-bottom: 26px;
}

.page-about .sec-head .eyebrow {
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--ff-display);
  font-size: clamp(23px, 4.2vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--white);
}

.page-about .sec-lede {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 五类服务 ---------- */
.page-about .svc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .svc-item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .svc-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .svc-idx {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .svc-body h3 {
  margin: 0 0 6px;
  font-family: var(--ff-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--white);
}

.page-about .svc-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 服务网络 ---------- */
.page-about .net-visual {
  margin: 0 0 24px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--about-shadow);
  overflow: hidden;
}

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

.page-about .net-visual path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.3;
  opacity: 0.5;
}

.page-about .net-visual circle {
  fill: var(--amber);
  opacity: 0.85;
}

.page-about .net-visual circle.dot-hub {
  fill: var(--cyan);
  opacity: 1;
}

.page-about .city-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px;
}

.page-about .city-group {
  padding: 14px 15px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(20, 48, 41, 0.5);
}

.page-about .city-group h3 {
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.13em;
  color: var(--cyan);
}

.page-about .city-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .city-group li {
  padding: 3px 9px;
  font-size: 12.5px;
  color: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* ---------- 图片框 ---------- */
.page-about .figure-frame {
  margin: 0 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  overflow: hidden;
}

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

.page-about .figure-frame figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 观赛四步 ---------- */
.page-about .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .step-list li {
  padding: 16px 17px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: var(--panel-2);
  box-shadow: var(--about-shadow);
}

.page-about .step-no {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .step-list h3 {
  margin: 6px 0 8px;
  font-family: var(--ff-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .step-list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 13px;
  margin-bottom: 24px;
}

.page-about .team-block {
  padding: 17px 17px 19px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  box-shadow: var(--about-shadow);
}

.page-about .team-num {
  display: block;
  font-size: clamp(32px, 6vw, 46px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .team-block h3 {
  margin: 10px 0 7px;
  font-family: var(--ff-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-block p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .team-note {
  margin: 0 0 24px;
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--magenta);
}

.page-about .team-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl li {
  position: relative;
  padding: 0 0 26px 28px;
  border-left: 1px solid var(--line);
}

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

.page-about .tl li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-2);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--amber);
  border: 1px solid rgba(255, 178, 62, 0.42);
  border-radius: 2px;
}

.page-about .tl-body h3 {
  margin: 0 0 6px;
  font-family: var(--ff-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--white);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .eco-block {
  padding: 16px 17px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.3);
}

.page-about .eco-block:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .eco-num {
  display: block;
  font-size: clamp(24px, 4.4vw, 32px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .eco-block h3 {
  margin: 8px 0 7px;
  font-family: var(--ff-display);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--white);
}

.page-about .eco-block p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .eco-award {
  margin: 0 0 22px;
  padding: 10px 14px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--cyan);
  border: 1px dashed rgba(39, 245, 200, 0.4);
  border-radius: var(--radius);
  background: rgba(39, 245, 200, 0.05);
}

.page-about .eco-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 22px;
  border-top: 1px dashed var(--line);
}

.page-about .eco-cta p {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.76;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .svc-item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 0;
  }

  .page-about .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 15px;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: 0 52px;
  }

  .page-about .about-index {
    position: sticky;
    top: 116px;
    align-self: start;
    padding-block: 56px;
    border-bottom: 0;
    background: transparent;
  }

  .page-about .index-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .index-list li + li {
    margin-top: 2px;
  }

  .page-about .index-list a {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    padding: 8px 12px;
    white-space: normal;
    font-size: 13.5px;
  }

  .page-about .index-list a:hover,
  .page-about .index-list a:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(39, 245, 200, 0.07);
  }

  .page-about .about-hero-body {
    padding-block: 52px 72px;
  }

  .page-about .sec {
    padding: 56px clamp(24px, 3.6vw, 46px) 64px;
  }

  .page-about .sec-head {
    margin-bottom: 32px;
  }

  .page-about .figure-frame img {
    max-height: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-list a {
    transition: none;
  }
}
<<<END>>>