.page-about {
  --about-toc-top: 112px;
  --about-hair: rgba(11, 31, 23, .14);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  padding: var(--s7) 0 var(--s6);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -35%;
  right: -22%;
  width: min(780px, 82vw);
  height: 175%;
  background: linear-gradient(155deg, var(--amber) 0%, rgba(217, 161, 40, 0) 62%);
  clip-path: polygon(56% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .2;
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .12em;
  color: rgba(246, 244, 238, .58);
  margin-bottom: var(--s7);
}

.page-about .about-crumb a {
  color: rgba(246, 244, 238, .58);
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold);
}

.page-about .about-hero__eyebrow {
  color: var(--gold);
  margin: 0 0 var(--s4);
}

.page-about .about-hero__title {
  margin: 0 0 var(--s5);
  max-width: 20ch;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 34em;
  color: rgba(246, 244, 238, .84);
  margin: 0 0 var(--s6);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
  margin-bottom: var(--s7);
}

.page-about .hero-metrics {
  list-style: none;
  margin: 0;
  padding: var(--s5) 0 0;
  border-top: 1px solid var(--line-light);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s5) var(--s4);
}

.page-about .hero-metrics li {
  min-width: 0;
}

.page-about .hero-metrics .metric {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--gold);
}

.page-about .hero-metrics .metric em {
  font-style: normal;
  font-size: .5em;
  margin-left: 2px;
  color: rgba(242, 206, 107, .78);
}

.page-about .hero-metrics small {
  display: block;
  margin-top: var(--s2);
  font-size: .8125rem;
  line-height: 1.7;
  color: rgba(246, 244, 238, .68);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: var(--s8) 0 var(--s9);
}

.page-about .about-shell {
  display: grid;
  gap: var(--s7);
}

/* ---------- 左侧章节索引 ---------- */
.page-about .about-toc__label {
  margin: 0 0 var(--s4);
  padding-bottom: var(--s3);
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--s4);
}

.page-about .about-toc li {
  min-width: 0;
  border-left: 2px solid transparent;
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .about-toc li:hover {
  border-left-color: var(--amber);
  background: var(--warm);
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: var(--s3);
  padding: var(--s2) 0 var(--s2) var(--s3);
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: .9375rem;
  line-height: 1.6;
  text-decoration: none;
  transition: color .18s ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--mid);
}

.page-about .about-toc a .mono {
  flex: none;
  color: var(--amber);
  font-size: var(--fs-mono);
  letter-spacing: .08em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: var(--s6) 0 var(--s7);
  border-top: 1px solid var(--line-strong);
  scroll-margin-top: 120px;
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: var(--s4);
  margin-bottom: var(--s5);
}

.page-about .about-section__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .about-section .section-title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.3;
}

.page-about .about-section .prose {
  max-width: 36em;
}

.page-about .about-section .prose p {
  margin: 0 0 var(--s4);
  font-size: var(--fs-body);
  line-height: 1.9;
}

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

/* ---------- 能力清单 ---------- */
.page-about .capability-grid {
  list-style: none;
  margin: var(--s6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s4);
}

.page-about .capability {
  padding: var(--s5);
  border: 1px solid var(--line-strong);
  background: var(--warm);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .capability:hover {
  border-color: var(--amber);
  transform: translateY(-2px);
}

.page-about .capability h3 {
  margin: 0 0 var(--s3);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .capability p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--teal);
}

/* ---------- 历程 ---------- */
.page-about .history-wrap {
  display: grid;
  gap: var(--s6);
}

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

.page-about .timeline__item {
  position: relative;
  padding: var(--s5) var(--s4) var(--s5) var(--s5);
  border-left: 1px solid var(--line-strong);
  transition: background-color .18s ease, border-color .18s ease;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: calc(var(--s5) + .42em);
  width: 7px;
  height: 7px;
  background: var(--amber);
  transform: rotate(45deg);
}

.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within {
  background: var(--warm);
  border-left-color: var(--amber);
}

.page-about .timeline__mark {
  margin: 0 0 var(--s2);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .16em;
  color: var(--teal);
}

.page-about .timeline__item h3 {
  margin: 0 0 var(--s3);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .timeline__item > p {
  margin: 0 0 var(--s3);
  font-size: .9375rem;
  line-height: 1.85;
}

.page-about .timeline__note {
  margin: 0;
  padding-left: var(--s3);
  border-left: 2px solid var(--line-strong);
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--gray);
  transition: border-color .18s ease, color .18s ease;
}

.page-about .timeline__item:hover .timeline__note,
.page-about .timeline__item:focus-within .timeline__note {
  border-left-color: var(--gold);
  color: var(--teal);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  padding: var(--s3);
  border: 1px solid var(--line-strong);
  background: var(--warm);
}

.page-about .about-figure__frame {
  overflow: hidden;
  background: var(--paper);
}

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

.page-about .about-figure--portrait .about-figure__frame { aspect-ratio: 4 / 5; }
.page-about .about-figure--square .about-figure__frame { aspect-ratio: 1 / 1; }
.page-about .about-figure--wide .about-figure__frame { aspect-ratio: 2 / 1; }

.page-about .about-figure figcaption {
  margin-top: var(--s3);
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 服务地区 ---------- */
.page-about .region-wrap {
  display: grid;
  gap: var(--s6);
}

.page-about .filing-strip {
  margin: var(--s6) 0 0;
  padding: var(--s3) 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  font-size: var(--fs-mono);
  letter-spacing: .14em;
  color: var(--gray);
}

/* ---------- 设备指南 ---------- */
.page-about .device-figure {
  margin: var(--s6) 0 0;
}

.page-about .device-chips {
  list-style: none;
  margin: var(--s6) 0 var(--s5);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
}

.page-about .device-chips a {
  display: inline-block;
  padding: var(--s2) var(--s4);
  border: 1px solid var(--line-strong);
  background: var(--warm);
  color: var(--ink);
  font-size: var(--fs-small);
  line-height: 1.6;
  text-decoration: none;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease;
}

.page-about .device-chips a:hover,
.page-about .device-chips a:focus-visible {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--paper);
}

.page-about .device-grid {
  display: grid;
  gap: var(--s4);
}

.page-about .device-card {
  padding: var(--s5) var(--s5) var(--s4);
  border: 1px solid var(--line-strong);
  background: var(--warm);
  scroll-margin-top: 128px;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.page-about .device-card:target {
  border-color: var(--amber);
  box-shadow: inset 0 0 0 1px var(--amber);
}

.page-about .device-card__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: var(--s4);
  background: var(--gold);
  color: var(--ink);
  font-size: .75rem;
  font-weight: 700;
}

.page-about .device-card h3 {
  margin: 0 0 var(--s2);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .device-card__scene {
  margin: 0 0 var(--s4);
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--teal);
}

.page-about .device-steps {
  list-style: none;
  counter-reset: dstep;
  margin: 0 0 var(--s4);
  padding: 0;
}

.page-about .device-steps li {
  counter-increment: dstep;
  position: relative;
  padding-left: var(--s5);
  margin-bottom: var(--s3);
  font-size: .9375rem;
  line-height: 1.8;
}

.page-about .device-steps li:last-child {
  margin-bottom: 0;
}

.page-about .device-steps li::before {
  content: counter(dstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .18em;
  font-family: var(--font-mono);
  font-size: .6875rem;
  color: var(--amber);
}

.page-about .device-card__meta {
  margin: 0 0 var(--s2);
  padding-top: var(--s3);
  border-top: 1px solid var(--line-strong);
  font-size: .8125rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .device-card__meta--reset {
  border-top-style: dashed;
}

.page-about .device-card__meta span {
  display: inline-block;
  margin-right: var(--s2);
  padding: 1px 6px;
  background: rgba(74, 107, 96, .14);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
}

/* ---------- 设备记忆 ---------- */
.page-about .memory-panels {
  display: grid;
  gap: var(--s4);
  margin-top: var(--s5);
}

.page-about .memory-panel {
  padding: var(--s5);
  border: 1px solid var(--line-strong);
  border-top-width: 3px;
  background: var(--warm);
}

.page-about .memory-panel--keep { border-top-color: var(--amber); }
.page-about .memory-panel--reset { border-top-color: var(--teal); }

.page-about .memory-panel h3 {
  margin: 0 0 var(--s4);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .memory-panel ul {
  margin: 0;
  padding-left: 1.15em;
}

.page-about .memory-panel li {
  margin-bottom: var(--s3);
  font-size: .9375rem;
  line-height: 1.85;
}

.page-about .memory-panel li:last-child {
  margin-bottom: 0;
}

.page-about .memory-note {
  margin-top: var(--s5);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  margin: var(--s5) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .team-list__row {
  display: grid;
  gap: var(--s2);
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .team-list dt {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .team-list dt .mono {
  margin-right: var(--s2);
  color: var(--amber);
  font-size: var(--fs-mono);
}

.page-about .team-list dd {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
}

.page-about .rhythm {
  margin-top: var(--s5);
  padding: var(--s4) var(--s5);
  border-left: 3px solid var(--amber);
  background: var(--warm);
}

.page-about .rhythm__item {
  margin: 0 0 var(--s3);
  font-size: .9375rem;
  line-height: 1.85;
}

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

.page-about .rhythm__item .mono {
  display: inline-block;
  min-width: 4em;
  margin-right: var(--s2);
  color: var(--amber);
  font-size: var(--fs-mono);
  letter-spacing: .12em;
}

/* ---------- 延伸阅读 ---------- */
.page-about .next-grid {
  display: grid;
  gap: var(--s4);
  margin-top: var(--s5);
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--s5);
  min-height: 176px;
  padding: var(--s5);
  border: 1px solid var(--line-strong);
  background: var(--warm);
  color: var(--ink);
  text-decoration: none;
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--amber);
  transform: translateY(-2px);
}

.page-about .next-card h3 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .next-card p {
  margin: var(--s3) 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--teal);
}

.page-about .next-card__go {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .12em;
  color: var(--amber);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .capability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .device-grid,
  .page-about .memory-panels,
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-list__row {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--s3) var(--s5);
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: var(--s8);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: var(--about-toc-top);
  }

  .page-about .about-toc ol {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .history-wrap,
  .page-about .region-wrap {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--s7);
    align-items: start;
  }

  .page-about .about-figure--portrait {
    position: sticky;
    top: var(--about-toc-top);
  }
}

@media (min-width: 1100px) {
  .page-about .capability-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .capability,
  .page-about .device-card,
  .page-about .next-card,
  .page-about .timeline__item {
    transition: none;
  }

  .page-about .capability:hover,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
<<<END>>>