.page-about {
  --about-rail: 108px;
  --about-gap: 26px;
  --about-line: rgba(167, 193, 182, .22);
  background:
    radial-gradient(120% 60% at 90% -8%, rgba(25, 227, 194, .10), transparent 62%),
    linear-gradient(180deg, rgba(18, 59, 74, .42) 0, rgba(6, 28, 22, 0) 520px);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 0;
}

.page-about .about-hero__inner {
  padding-bottom: 38px;
}

.page-about .about-hero .breadcrumbs {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--mist);
  margin-bottom: 26px;
}

.page-about .about-hero .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

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

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__tick {
  color: var(--orange);
  padding: 0 4px;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(34px, 8.6vw, 88px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--ink);
  background: var(--cyan);
  padding: 0 .16em .04em;
  border-radius: 4px 14px 4px 14px;
  box-shadow: 0 0 0 1px rgba(25, 227, 194, .35);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0 0 32px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--paper-70);
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-b);
  overflow: hidden;
}

.page-about .hero-facts li {
  background: rgba(11, 42, 34, .82);
  padding: 16px 16px 14px;
}

.page-about .hero-facts b {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(21px, 4.2vw, 30px);
  line-height: 1.1;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .hero-facts li:nth-child(2) b { color: var(--cyan); }
.page-about .hero-facts li:nth-child(4) b { color: var(--gold); }

.page-about .hero-facts span {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 叙事骨架 ---------- */
.page-about .about-narrative {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: 60px;
}

.page-about .year-rail {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  padding: 12px 0 10px;
}

.page-about .year-rail__cap {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .year-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .year-rail__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
}

.page-about .year-rail__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .year-rail__label {
  font-size: 12px;
  color: var(--mist);
}

.page-about .year-rail__link:hover,
.page-about .year-rail__link:focus-visible {
  border-color: var(--cyan);
  background: var(--cyan-a10);
}

.page-about .year-rail__link:hover .year-rail__label,
.page-about .year-rail__link:focus-visible .year-rail__label {
  color: var(--paper);
}

/* ---------- 章节通用 ---------- */
.page-about .story {
  padding: 44px 0 8px;
  border-top: 1px solid var(--about-line);
}

.page-about .story .kicker {
  display: block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-h2 {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 5vw, 37px);
  line-height: 1.26;
  letter-spacing: -.005em;
  color: var(--paper);
  max-width: 26ch;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-70);
}

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

/* ---------- 品牌起点 ---------- */
.page-about .origin-body {
  display: grid;
  gap: 22px;
}

.page-about .origin-media {
  position: relative;
  border-radius: var(--radius-a);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .origin-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 28, 22, .05), rgba(6, 28, 22, .72)),
    repeating-linear-gradient(90deg, rgba(25, 227, 194, .10) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

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

.page-about .origin-media .media-frame__tag {
  position: absolute;
  z-index: 2;
  left: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--cyan);
  background: rgba(6, 28, 22, .72);
  border: 1px solid rgba(25, 227, 194, .34);
  border-radius: 3px;
  padding: 4px 8px;
}

.page-about .origin-note {
  margin-top: 20px;
  padding: 14px 16px;
  border-left: 3px solid var(--gold);
  background: rgba(232, 197, 106, .07);
  border-radius: 0 10px 10px 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper-70) !important;
}

.page-about .origin-note__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 6px;
}

/* ---------- 城市坐标 ---------- */
.page-about .coordinate-grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .coordinate-map {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-b);
  background: linear-gradient(160deg, rgba(18, 59, 74, .55), rgba(11, 42, 34, .35));
}

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

.page-about .coord-map__grid path {
  fill: none;
  stroke: rgba(167, 193, 182, .16);
  stroke-width: 1;
}

.page-about .coord-map__links path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.3;
  opacity: .5;
}

.page-about .coord-map__dots circle {
  fill: var(--cyan);
}

.page-about .coord-map__dots circle:nth-child(even) {
  fill: var(--orange);
}

.page-about .coord-map__field path {
  fill: none;
  stroke: rgba(243, 239, 227, .34);
  stroke-width: 1.2;
  stroke-dasharray: 5 5;
}

.page-about .coordinate-map__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 18 点节奏 ---------- */
.page-about .rhythm-grid {
  display: grid;
  gap: 24px;
}

.page-about .rhythm-media {
  position: relative;
  border-radius: var(--radius-b);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

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

.page-about .rhythm-media .media-frame__tag {
  position: absolute;
  z-index: 2;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--orange);
  border-radius: 3px;
  padding: 4px 9px;
}

.page-about .rhythm-lede {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: clamp(17px, 3.4vw, 20px);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .process {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .process__item {
  position: relative;
  padding: 13px 0 13px 18px;
  border-left: 2px solid rgba(167, 193, 182, .3);
  transition: border-color .3s var(--ease), background .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .process__item:hover,
.page-about .process__item:focus-within {
  border-left-color: var(--cyan);
  padding-left: 24px;
  background: linear-gradient(90deg, var(--cyan-a10), transparent 70%);
}

.page-about .process__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .process__name {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .process__duty {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper-50);
  transition: color .3s var(--ease);
}

.page-about .process__item:hover .process__duty,
.page-about .process__item:focus-within .process__duty {
  color: var(--paper-70);
}

/* ---------- 服务对象 ---------- */
.page-about .audience {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .audience__item {
  padding: 22px 0 20px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .audience__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 3px;
  padding: 2px 7px;
  margin-bottom: 10px;
}

.page-about .audience__item:nth-child(even) .audience__num {
  background: var(--gold);
}

.page-about .audience__name {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  color: var(--paper);
}

.page-about .audience__text {
  margin: 0 0 10px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-70);
}

.page-about .audience__link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 194, .38);
  padding-bottom: 2px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

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

/* ---------- 里程碑 ---------- */
.page-about .milestones {
  border-top: 1px solid var(--about-line);
}

.page-about .milestone {
  border-bottom: 1px solid var(--about-line);
}

.page-about .milestone__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--mist);
  transition: transform .25s var(--ease), color .25s var(--ease);
}

.page-about .milestone[open] .milestone__head::after {
  content: "−";
  color: var(--orange);
}

.page-about .milestone__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .milestone__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .milestone__body {
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 2px solid rgba(25, 227, 194, .35);
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-70);
  max-width: 62ch;
}

.page-about .milestone__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 协作网络 ---------- */
.page-about .network-grid {
  display: grid;
  gap: 24px;
}

.page-about .network-media {
  position: relative;
  border-radius: var(--radius-a);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

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

.page-about .network-media .media-frame__tag {
  position: absolute;
  z-index: 2;
  left: 14px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--paper);
  background: rgba(6, 28, 22, .78);
  border: 1px solid var(--about-line);
  border-radius: 3px;
  padding: 4px 9px;
}

.page-about .network-link {
  display: inline-block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 43, .45);
  padding-bottom: 2px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

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

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 24px;
}

.page-about .team-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-b);
  overflow: hidden;
}

.page-about .team-facts__item {
  background: rgba(11, 42, 34, .78);
  padding: 14px 16px;
}

.page-about .team-facts__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .team-facts__v {
  display: block;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 44px;
  padding: 28px 22px 30px;
  border-radius: var(--radius-a);
  background:
    radial-gradient(120% 140% at 100% 0, rgba(255, 106, 43, .18), transparent 60%),
    linear-gradient(150deg, rgba(25, 227, 194, .12), rgba(11, 42, 34, .9));
  border: 1px solid rgba(25, 227, 194, .26);
}

.page-about .about-cta__title {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.35;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .hero-facts li {
    padding: 18px 18px 16px;
  }

  .page-about .about-hero__lede {
    font-size: 17.5px;
  }

  .page-about .coordinate-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 32px;
    align-items: center;
  }

  .page-about .rhythm-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    gap: 30px;
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .audience__item {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    column-gap: 18px;
    align-items: baseline;
  }

  .page-about .audience__num {
    grid-row: 1 / span 3;
    margin-bottom: 0;
    align-self: start;
  }

  .page-about .audience__item:nth-child(even) {
    padding-left: 6%;
  }

  .page-about .audience__text {
    max-width: 58ch;
  }

  .page-about .about-cta {
    padding: 34px 34px 36px;
  }
}

@media (min-width: 960px) {
  .page-about .about-narrative {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 42px;
    align-items: start;
  }

  .page-about .year-rail {
    position: sticky;
    top: 26px;
    border-top: none;
    border-bottom: none;
    border-left: 1px solid var(--about-line);
    padding: 6px 0 6px 16px;
  }

  .page-about .year-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }

  .page-about .year-rail__link {
    border: none;
    border-radius: 0;
    padding: 7px 0 7px 0;
    gap: 10px;
    position: relative;
  }

  .page-about .year-rail__link::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 50%;
    width: 7px;
    height: 7px;
    transform: translateY(-50%) rotate(45deg);
    background: rgba(167, 193, 182, .45);
    transition: background .25s var(--ease), box-shadow .25s var(--ease);
  }

  .page-about .year-rail__link:hover::before,
  .page-about .year-rail__link:focus-visible::before {
    background: var(--cyan);
    box-shadow: 0 0 0 4px rgba(25, 227, 194, .16);
  }

  .page-about .year-rail__link:hover,
  .page-about .year-rail__link:focus-visible {
    background: transparent;
  }

  .page-about .year-rail__num {
    min-width: 52px;
    font-size: 12px;
  }

  .page-about .story {
    padding: 52px 0 12px;
  }

  .page-about .story:first-child {
    padding-top: 8px;
  }

  .page-about .origin-body {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .origin-media {
    position: sticky;
    top: 26px;
  }

  .page-about .about-h2 {
    font-size: clamp(28px, 3.2vw, 38px);
  }

  .page-about .about-cta__row {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .process__item,
  .page-about .audience__link,
  .page-about .network-link,
  .page-about .year-rail__link,
  .page-about .milestone__head::after {
    transition: none;
  }
}
<<<END>>>