.page-about {
  --ab-line: rgba(147, 160, 196, 0.26);
  --ab-line-soft: rgba(147, 160, 196, 0.14);
  color: var(--paper);
  background: var(--ink-900);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--ink-500);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(255, 90, 31, 0.20), transparent 62%),
    radial-gradient(90% 70% at 0% 110%, rgba(43, 239, 210, 0.13), transparent 68%),
    var(--ink-900);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -60% 40%;
  height: 320px;
  background: repeating-linear-gradient(115deg, rgba(194, 84, 47, 0.20) 0 1px, transparent 1px 26px);
  transform: rotate(-4deg);
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--slate);
}

.page-about .breadcrumb a {
  color: var(--paper-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-hero .eyebrow {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lead {
  position: relative;
  z-index: 1;
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-strip {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
}

.page-about .about-strip__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  background: var(--ink-700);
}

.page-about .about-strip__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-strip__unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--orange-soft);
}

.page-about .about-strip__label {
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 主分栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 44px);
  padding: clamp(28px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-soft);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--paper-dim);
  text-decoration: none;
  background: var(--ink-700);
  border: 1px solid var(--ink-500);
  border-left: 3px solid transparent;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-rail__link .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  background: var(--ink-500);
  border-left-color: var(--orange);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding-bottom: clamp(32px, 5vw, 64px);
  margin-bottom: clamp(32px, 5vw, 64px);
  border-bottom: 1px dashed var(--ab-line);
}

.page-about .about-block:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-block__index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  letter-spacing: 0.08em;
}

.page-about .about-block__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-block__lead {
  max-width: 62ch;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-cols__main {
  min-width: 0;
}

.page-about .about-cols__main p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-dim);
}

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

.page-about .about-cols__main a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 239, 210, 0.5);
}

.page-about .about-cols__main a:hover,
.page-about .about-cols__main a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* 旁注档案卡 */
.page-about .about-note {
  position: relative;
  padding: 18px 16px;
  background: var(--ink-700);
  border: 1px solid var(--ink-500);
  border-top: 3px solid var(--cyan);
}

.page-about .about-note--clay {
  border-top-color: var(--clay);
}

.page-about .about-note--gold {
  border-top-color: var(--gold);
}

.page-about .about-note__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-note__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-note__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .about-note__text:last-child {
  margin-bottom: 0;
}

/* ---------- 州市点阵 ---------- */
.page-about .about-cities {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  list-style: none;
}

.page-about .about-city {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 10px;
  font-size: 14px;
  color: var(--paper-dim);
  background: var(--ink-700);
  border: 1px solid var(--ink-500);
  cursor: default;
}

.page-about .about-city__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(43, 239, 210, 0.75);
}

.page-about .about-city__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 6px);
  z-index: 3;
  padding: 4px 8px;
  font-size: 12px;
  white-space: nowrap;
  color: var(--black);
  background: var(--paper);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 160ms var(--ease), transform 160ms var(--ease);
  pointer-events: none;
}

.page-about .about-city:hover,
.page-about .about-city:focus-visible {
  border-color: var(--cyan);
  color: var(--paper);
}

.page-about .about-city:hover .about-city__tip,
.page-about .about-city:focus-visible .about-city__tip,
.page-about .about-city:focus-within .about-city__tip {
  opacity: 1;
  transform: translateY(0);
}

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

/* ---------- 地域纹理图 ---------- */
.page-about .about-texture {
  position: relative;
  margin: 0 0 clamp(24px, 4vw, 36px);
  border: 1px solid var(--ink-500);
  overflow: hidden;
}

.page-about .about-texture img {
  display: block;
  width: 100%;
  height: clamp(200px, 40vw, 340px);
  object-fit: cover;
  opacity: 0.88;
}

.page-about .about-texture figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper);
  background: linear-gradient(to top, rgba(11, 18, 48, 0.94), rgba(11, 18, 48, 0.1));
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 28px);
  margin-bottom: 22px;
}

.page-about .about-bar {
  margin-bottom: 16px;
}

.page-about .about-bar:last-child {
  margin-bottom: 0;
}

.page-about .about-bar__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-bar__head .num {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-bar__track {
  margin-top: 8px;
  height: 14px;
  background: var(--ink-700);
  border: 1px solid var(--ink-500);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--orange-soft));
  transform: scaleX(1);
  transform-origin: left center;
  transition: transform 360ms var(--ease);
}

.page-about .about-bar__fill--cyan {
  background: linear-gradient(90deg, var(--cyan), #7ff5e4);
}

.page-about .about-bar__fill--gold {
  background: linear-gradient(90deg, var(--gold), #f8dda6);
}

.page-about .js-ready .about-bar__fill {
  transform: scaleX(0);
}

.page-about .js-ready .is-revealed .about-bar__fill {
  transform: scaleX(1);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--ink-500);
  background: var(--ink-700);
}

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

.page-about .about-figure figcaption {
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
  border-top: 1px solid var(--ink-500);
}

.page-about .about-team__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 折叠 ---------- */
.page-about .about-details {
  margin-top: 20px;
  border: 1px solid var(--ink-500);
  background: var(--ink-700);
}

.page-about .about-details summary {
  padding: 12px 14px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

.page-about .about-details summary::-webkit-details-marker {
  display: none;
}

.page-about .about-details summary::before {
  content: "+";
  display: inline-block;
  width: 18px;
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .about-details[open] summary::before {
  content: "−";
}

.page-about .about-details summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-details .details__body {
  padding: 0 14px 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .about-details .details__body p {
  margin: 12px 0 0;
}

/* ---------- 历程档案夹 ---------- */
.page-about .about-stages {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: stage;
}

.page-about .about-stage {
  position: relative;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: clamp(18px, 3vw, 26px);
  color: var(--black);
  background: var(--paper);
  box-shadow:
    6px 6px 0 -1px var(--ink-700),
    12px 12px 0 -2px rgba(42, 58, 118, 0.4);
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 20px;
  height: 20px;
  background: var(--ink-900);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .about-stage__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--black);
  background: var(--orange);
}

.page-about .about-stage h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--black);
}

.page-about .about-stage p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: #1d2338;
}

/* ---------- 战报流程 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  padding: 16px 14px 18px;
  background: var(--ink-700);
  border: 1px solid var(--ink-500);
  border-top: 3px solid var(--orange);
}

.page-about .about-step__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .about-figure--wide {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-note .btn {
  margin-top: 4px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: clamp(24px, 6vw, 72px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .page-about .about-block__head {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar__fill,
  .page-about .about-city__tip,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .js-ready .about-bar__fill {
    transform: scaleX(1);
  }
}
<<<PAGE_CSS_END>>>