.page-about {
  --about-gap: 24px;
  --about-cut: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 26px 6px;
}

.page-about .about-hero .crumbs {
  margin-bottom: 22px;
}

.page-about .about-hero__layout {
  display: grid;
  gap: 28px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 7vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 22ch;
  text-wrap: balance;
}

.page-about .about-hero__lead .lede {
  margin-top: 16px;
  max-width: 62ch;
}

.page-about .about-hero__toc {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__meta-item {
  background: var(--card);
  padding: 14px 16px;
}

.page-about .about-hero__meta dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .about-hero__meta dd {
  margin: 6px 0 0;
  font-family: var(--font-num);
  font-size: 21px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ---------- 通用章节装饰 ---------- */
.page-about .section {
  scroll-margin-top: 76px;
}

.page-about .section__note {
  max-width: 66ch;
}

/* ---------- 01 业务范围 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-step {
  position: relative;
  padding: 22px 20px 20px;
  border-top: 3px solid var(--blue);
}

.page-about .about-step:hover {
  border-top-color: var(--orange);
}

.page-about .about-step__no {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-step .panel__title {
  margin-top: 10px;
  font-size: 19px;
  color: var(--ink-2);
}

.page-about .about-step__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-step__tag {
  margin: 16px 0 0;
}

/* ---------- 02 时间线 ---------- */
.page-about .about-figure {
  margin: 26px 0 8px;
}

.page-about .about-timeline {
  margin-top: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .era {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px 26px;
  padding: 22px 0 20px;
  border-top: 1px solid var(--line);
  transition: border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-about .era:hover {
  border-top-color: var(--blue-bright);
  background: linear-gradient(90deg, rgba(76, 141, 255, 0.06), transparent 62%);
}

.page-about .era__year {
  margin: 0;
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--gray);
  transition: color var(--dur) ease;
}

.page-about .era:hover .era__year {
  color: var(--orange);
}

.page-about .era__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-2);
}

.page-about .era__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 64ch;
}

.page-about .era__more {
  margin-top: 12px;
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .era__more summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--blue);
  list-style: none;
  padding: 2px 0;
}

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

.page-about .era__more summary::before {
  content: "+ ";
  font-family: var(--font-num);
}

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

.page-about .era__list {
  margin: 10px 0 4px;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 03 覆盖与承接 ---------- */
.page-about .coverage {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

.page-about .coverage__figure {
  margin: 0;
}

.page-about .city-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .city {
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .city:hover {
  border-color: var(--blue-bright);
  transform: translateX(2px);
}

.page-about .city__name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink-2);
}

.page-about .city__note {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--gray);
}

.page-about .coverage__note {
  margin-top: 24px;
  padding: 20px 20px;
  background: var(--paper);
  border-left: 3px solid var(--blue);
}

.page-about .coverage__note-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-2);
}

.page-about .coverage__note p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 64ch;
}

.page-about .coverage__more {
  margin-bottom: 0 !important;
  font-size: 14px !important;
  color: var(--gray) !important;
}

.page-about .coverage__more a,
.page-about .about-review__link a,
.page-about .about-quality__link a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur) ease;
}

.page-about .coverage__more a:hover,
.page-about .about-review__link a:hover,
.page-about .about-quality__link a:hover {
  color: var(--orange);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  margin-top: 24px;
}

.page-about .about-role {
  padding: 20px 18px;
  margin-bottom: 16px;
  border-top: 2px solid var(--mint);
}

.page-about .about-role__no {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

.page-about .about-role .panel__title {
  margin-top: 10px;
  font-size: 18px;
  color: var(--ink-2);
}

.page-about .about-role__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 05 服务商准入 ---------- */
.page-about .about-audit {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .audit-item {
  padding: 20px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
}

.page-about .audit-item__no {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
  font-weight: 600;
}

.page-about .audit-item__title {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-2);
}

.page-about .audit-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-review {
  margin-top: 22px;
  padding: 22px 20px;
  border-left: 3px solid var(--amber);
}

.page-about .about-review .panel__title {
  font-size: 18px;
  color: var(--ink-2);
}

.page-about .about-review p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 68ch;
}

.page-about .about-review__link {
  font-size: 14px;
  color: var(--gray);
}

/* ---------- 06 质量体系 ---------- */
.page-about .about-quality {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .quality-stat {
  background: var(--card);
  padding: 20px 18px;
}

.page-about .quality-stat__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: -0.02em;
}

.page-about .quality-stat__label {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-quality__body {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.page-about .about-quality__sub {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-2);
  padding-left: 12px;
  border-left: 3px solid var(--mint);
}

.page-about .about-quality__text p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 64ch;
}

.page-about .about-quality__link {
  font-size: 14px !important;
  color: var(--gray) !important;
}

/* ---------- 07 收尾 ---------- */
.page-about .about-cta {
  padding: 30px 22px;
  border-left: 3px solid var(--orange);
}

.page-about .about-cta__label {
  margin-bottom: 12px;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(22px, 4.6vw, 30px);
  color: var(--card);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(252, 250, 245, 0.78);
  max-width: 62ch;
}

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

/* ---------- 悬停设备：城市说明牌展开 ---------- */
@media (hover: hover) and (pointer: fine) {
  .page-about .city {
    overflow: hidden;
  }

  .page-about .city__note {
    max-height: 0;
    opacity: 0;
    transition: max-height var(--dur) ease, opacity var(--dur) ease;
  }

  .page-about .city:hover .city__note,
  .page-about .city:focus-within .city__note {
    max-height: 44px;
    opacity: 1;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-block: 36px 10px;
  }

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

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

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

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

  .page-about .about-quality__body {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero__toc {
    padding-bottom: 4px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-steps > :nth-child(1) {
    grid-column: span 5;
  }

  .page-about .about-steps > :nth-child(2) {
    grid-column: span 7;
  }

  .page-about .about-steps > :nth-child(3) {
    grid-column: span 7;
  }

  .page-about .about-steps > :nth-child(4) {
    grid-column: span 5;
  }

  .page-about .about-timeline {
    padding-left: 8px;
    border-left: 1px dashed var(--line);
  }

  .page-about .era {
    grid-template-columns: 132px minmax(0, 1fr);
    padding: 26px 0 24px 18px;
    border-top: 1px solid var(--line);
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .coverage__figure {
    position: sticky;
    top: 24px;
  }

  .page-about .about-cta {
    padding: 40px 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .city,
  .page-about .era,
  .page-about .era__year,
  .page-about .city__note,
  .page-about .coverage__more a,
  .page-about .about-review__link a,
  .page-about .about-quality__link a {
    transition: none;
  }

  .page-about .city:hover {
    transform: none;
  }
}
<<<END>>>