.page-about {
  --about-ink: #16233F;
  --about-ink-soft: #4B5568;
  --about-amber-ink: #8A5200;
  --about-card-paper: #FBF7EF;
  --about-hair: rgba(42, 58, 92, .55);
  padding-block: clamp(18px, 3vw, 32px) clamp(48px, 8vw, 88px);
  font-family: var(--font-body);
  color: var(--text);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 24px;
  margin-top: 16px;
}

.page-about .about-hero__main {
  position: relative;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .02em;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.06;
  margin: .55rem 0 .9rem;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(232, 238, 247, .84);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .hero-chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
}

.page-about .hero-chip--wide {
  grid-column: 1 / -1;
  background: linear-gradient(120deg, rgba(53, 230, 216, .12), rgba(139, 92, 246, .16));
  border-color: rgba(53, 230, 216, .35);
}

.page-about .hero-chip__k {
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .hero-chip__v {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--amber);
  line-height: 1.1;
}

.page-about .hero-chip__n {
  font-size: .8125rem;
  color: var(--muted);
}

/* ---------- 目录时间轴 ---------- */
.page-about .about-rail {
  margin: 32px 0 0;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px;
  list-style: none;
  min-width: max-content;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .875rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(53, 230, 216, .09);
}

.page-about .about-rail__num {
  font-size: .75rem;
  color: var(--cyan);
}

/* ---------- 通用分区 ---------- */
.page-about .about-sec {
  margin-top: clamp(42px, 7vw, 80px);
  scroll-margin-top: calc(var(--mast-h) + 18px);
}

.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: 22px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .02em;
  font-size: clamp(1.45rem, 4.4vw, 2.1rem);
  line-height: 1.18;
  margin: .35rem 0 .7rem;
  color: var(--text);
}

.page-about .sec-head__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 三条主线 ---------- */
.page-about .role-grid {
  display: grid;
  gap: 14px;
}

.page-about .role-card {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .role-card__bar {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
}

.page-about .role-card__bar--amber { background: var(--amber); }
.page-about .role-card__bar--cyan { background: var(--cyan); }
.page-about .role-card__bar--violet { background: var(--violet); }

.page-about .role-card__name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .role-card__meta {
  margin: 6px 0 10px;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .role-card__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(232, 238, 247, .8);
}

.page-about .role-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: .875rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 暖纸色档案面板 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--about-ink);
  border: 1px solid var(--paper-stripe);
  border-radius: var(--radius);
  padding: clamp(20px, 4vw, 42px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-paper .eyebrow {
  color: var(--about-amber-ink);
}

.page-about .about-paper .section-title {
  color: var(--about-ink);
}

.page-about .about-paper__lead {
  margin: 0;
  max-width: 58ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-paper__head {
  margin-bottom: 24px;
}

.page-about .about-paper__grid {
  display: grid;
  gap: 24px;
}

/* ---------- 分类列表 ---------- */
.page-about .tax-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .tax-item {
  padding: 15px 16px;
  background: rgba(255, 255, 255, .55);
  border: 1px solid var(--paper-stripe);
  border-radius: var(--radius-sm);
}

.page-about .tax-item__name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .tax-item__desc {
  margin: 7px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .tax-item__foot {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--paper-stripe);
  font-size: .875rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--paper-stripe);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: rgba(255, 255, 255, .5);
}

.page-about .media img {
  display: block;
  width: 100%;
}

.page-about .media__caption {
  padding: 10px 13px;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
  background: rgba(226, 214, 190, .45);
}

/* ---------- 分类地图标签 ---------- */
.page-about .map-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .map-tag {
  position: relative;
}

.page-about .map-tag .tag {
  font-size: .8125rem;
}

.page-about .about-paper .tag--cyan {
  background: rgba(53, 230, 216, .18);
  color: #0F6E67;
  border-color: rgba(15, 110, 103, .32);
}

.page-about .about-paper .tag--amber {
  background: rgba(255, 182, 61, .22);
  color: #8A5200;
  border-color: rgba(138, 82, 0, .32);
}

.page-about .map-tag__pop {
  display: block;
  margin-top: 5px;
  font-size: .75rem;
  line-height: 1.5;
  color: var(--about-ink-soft);
}

/* ---------- 首次设置 ---------- */
.page-about .about-setup {
  align-items: stretch;
}

.page-about .setup-card {
  position: relative;
  padding-top: 22px;
}

.page-about .setup-card__num {
  display: block;
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .setup-card__where {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: .8125rem;
  color: var(--muted);
}

.page-about .setup-card__where .mono {
  color: var(--amber);
  margin-right: 8px;
}

.page-about .setup-foot {
  margin: 20px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .setup-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 216, .4);
}

.page-about .setup-foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 版本演进 ---------- */
.page-about .ver-figure {
  margin: 0 0 26px;
  border: 1px solid var(--paper-stripe);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: rgba(255, 255, 255, .5);
}

.page-about .ver-figure img {
  display: block;
  width: 100%;
}

.page-about .ver-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ver-item {
  display: grid;
  gap: 10px;
}

.page-about .ver-spine {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-left: 2px;
}

.page-about .ver-num {
  font-size: .875rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--about-amber-ink);
}

.page-about .ver-phase {
  font-size: .8125rem;
  color: var(--about-ink-soft);
}

.page-about .dossier {
  background: var(--about-card-paper);
  border: 1px solid var(--paper-stripe);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(255, 255, 255, .7), 0 14px 28px -24px rgba(22, 35, 63, .85);
}

.page-about .dossier__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 700;
  color: var(--about-ink);
  transition: background .18s var(--ease);
}

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

.page-about .dossier__sum:hover,
.page-about .dossier__sum:focus-visible {
  background: rgba(226, 214, 190, .5);
}

.page-about .dossier__mark {
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--about-amber-ink);
  border-bottom: 2px solid var(--about-amber-ink);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}

.page-about .dossier[open] .dossier__mark {
  transform: rotate(-135deg);
}

.page-about .dossier__body {
  padding: 0 16px 16px;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .dossier__body p {
  margin: 0;
}

.page-about .dossier__points {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .dossier__points li {
  position: relative;
  padding-left: 16px;
  font-size: .875rem;
  line-height: 1.75;
}

.page-about .dossier__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--cyan);
}

/* ---------- 阶段折线图 ---------- */
.page-about .evolve-chart {
  margin: 28px 0 0;
  padding: 16px 14px 12px;
  background: rgba(255, 255, 255, .5);
  border: 1px solid var(--paper-stripe);
  border-radius: var(--radius-sm);
}

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

.page-about .evolve-chart__cap {
  margin: 10px 0 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .ver-foot {
  margin: 20px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .ver-foot a {
  color: #0F6E67;
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 110, 103, .45);
}

.page-about .ver-foot a:hover {
  border-bottom-color: #0F6E67;
}

/* ---------- 团队协作 ---------- */
.page-about .team-band {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--night);
}

.page-about .team-band__img {
  display: block;
  width: 100%;
  height: clamp(150px, 26vw, 250px);
  object-fit: cover;
  opacity: .72;
}

.page-about .team-band__cards {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 0 14px 16px;
  margin-top: -42px;
}

.page-about .team-card {
  padding: 15px 16px;
  background: rgba(16, 28, 54, .95);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.page-about .team-card__k {
  margin: 0;
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .team-card__v {
  margin: 6px 0 8px;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--amber);
  line-height: 1;
}

.page-about .team-card__n {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(232, 238, 247, .78);
}

.page-about .team-note {
  margin: 18px 0 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 14px;
}

.page-about .partner-card {
  padding: 18px;
  background: linear-gradient(160deg, rgba(53, 230, 216, .07), rgba(139, 92, 246, .09) 70%, rgba(10, 18, 36, 0));
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.page-about .partner-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--amber);
  line-height: 1;
}

.page-about .partner-card__t {
  margin: 8px 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .partner-card__d {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(232, 238, 247, .78);
}

.page-about .access-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: access;
}

.page-about .access-step {
  position: relative;
  padding: 15px 16px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  background: rgba(16, 28, 54, .55);
}

.page-about .access-step__n {
  display: block;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .access-step__t {
  margin: 7px 0 7px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .access-step__d {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务范围 ---------- */
.page-about .region {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(53, 230, 216, .12), rgba(139, 92, 246, .16) 55%, rgba(10, 18, 36, 0) 100%),
    var(--panel);
}

.page-about .region__text {
  margin: 0;
  max-width: 60ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: rgba(232, 238, 247, .82);
}

.page-about .region__side {
  padding: 16px;
  border: 1px solid rgba(53, 230, 216, .3);
  border-radius: var(--radius-sm);
  background: rgba(10, 18, 36, .6);
}

.page-about .region__k {
  margin: 0 0 8px;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .region__v {
  margin: 0 0 16px;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(232, 238, 247, .8);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: 1.15fr 1fr 1fr;
  }

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

  .page-about .team-band__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding: 0 18px 18px;
    margin-top: -52px;
  }

  .page-about .map-tag__pop {
    position: absolute;
    left: 0;
    top: 100%;
    z-index: 3;
    margin-top: 6px;
    padding: 6px 10px;
    width: max-content;
    max-width: 220px;
    font-size: .75rem;
    color: var(--about-ink);
    background: var(--about-card-paper);
    border: 1px solid var(--paper-stripe);
    border-radius: 8px;
    box-shadow: 0 10px 22px -16px rgba(22, 35, 63, .9);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s var(--ease);
  }

  .page-about .map-tag:hover .map-tag__pop,
  .page-about .map-tag:focus-within .map-tag__pop {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.65fr) minmax(270px, .85fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-paper__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .9fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .ver-item {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .ver-spine {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding-top: 14px;
    position: sticky;
    top: calc(var(--mast-h) + 16px);
  }

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

  .page-about .region {
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, .8fr);
    align-items: center;
    gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .dossier__mark,
  .page-about .map-tag__pop,
  .page-about .about-rail__link,
  .page-about .dossier__sum {
    transition: none;
  }
}
<<<END>>>