.page-about {
  --about-hair: #C9D3DD;
  --about-rail-w: 100px;
  background: var(--wd-paper);
  color: var(--wd-ink);
  overflow-x: clip;
}

.page-about .about-crumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 14px;
  padding: 34px 0 40px;
  background: var(--wd-ink);
  color: var(--wd-paper);
  border-top: var(--wd-border);
  border-bottom: var(--wd-border);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -90px;
  width: 260px;
  height: 260px;
  background: var(--wd-orange);
  opacity: 0.16;
  transform: rotate(24deg);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -40px;
  bottom: -110px;
  width: 220px;
  height: 220px;
  border: 2px solid var(--wd-cyan);
  opacity: 0.22;
  transform: rotate(18deg);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--wd-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--wd-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--wd-font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(30px, 7.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-about .about-hero__text {
  margin: 0 0 24px;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--wd-mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__panel {
  border: 2px solid var(--wd-mist);
  background: rgba(255, 255, 255, 0.04);
  padding: 18px 16px 8px;
}

.page-about .about-hero__panel-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--wd-mist);
}

.page-about .about-hero__panel-version {
  margin: 6px 0 16px;
  font-size: 22px;
  font-weight: 700;
  color: var(--wd-orange);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 16px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0;
  border-top: 1px solid rgba(143, 163, 181, 0.34);
}

.page-about .about-stat__num {
  font-family: var(--wd-font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--wd-paper);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--wd-mist);
}

/* ---------- 服务主线 ---------- */
.page-about .about-origin {
  background: var(--wd-paper);
}

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

.page-about .about-origin__no {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--wd-orange);
}

.page-about .about-origin__title {
  margin: 0 0 16px;
  font-family: var(--wd-font-serif);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.28;
}

.page-about .about-origin__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--wd-steel);
}

.page-about .about-origin__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-origin__item {
  position: relative;
  border: var(--wd-border);
  background: var(--wd-white);
  box-shadow: var(--wd-shadow);
  padding: 18px 16px 18px 56px;
}

.page-about .about-origin__mark {
  position: absolute;
  left: 14px;
  top: 18px;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  background: var(--wd-ink);
  color: var(--wd-cyan);
  font-size: 13px;
  font-weight: 700;
}

.page-about .about-origin__item-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-origin__item-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--wd-steel);
}

/* ---------- 时间轴 ---------- */
.page-about .about-head--dark .wd-section__title,
.page-about .about-head--dark .wd-section__eyebrow,
.page-about .about-head--dark .wd-section__sub {
  color: var(--wd-paper);
}

.page-about .about-head--dark .wd-section__sub {
  color: var(--wd-mist);
}

.page-about .about-track {
  border-top: var(--wd-border);
  border-bottom: var(--wd-border);
}

.page-about .about-track__figure {
  margin: 0 0 26px;
  border: var(--wd-border);
  box-shadow: var(--wd-shadow);
  background: var(--wd-white);
}

.page-about .about-track__figure .wd-media__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--wd-steel);
}

.page-about .about-timeline {
  display: grid;
  gap: 18px;
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  padding: 8px 16px;
  border: var(--wd-border);
  background: var(--wd-white);
  color: var(--wd-ink);
  font-family: var(--wd-font-mono);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--wd-shadow-sm);
  transition: transform var(--wd-dur) var(--wd-ease), background var(--wd-dur) var(--wd-ease);
}

.page-about .about-rail__link:hover {
  transform: translate(-2px, -2px);
  background: var(--wd-cyan);
}

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

.page-about .about-rail__link--current {
  background: var(--wd-orange);
  color: var(--wd-black);
}

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

.page-about .about-era {
  position: relative;
  background: var(--wd-white);
  border: var(--wd-border);
  box-shadow: var(--wd-shadow);
  padding: 20px 18px;
  scroll-margin-top: 110px;
}

.page-about .about-era + .about-era {
  margin-top: 18px;
}

.page-about .about-era--current {
  box-shadow: var(--wd-shadow-lg);
}

.page-about .about-era--current::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--wd-orange);
}

.page-about .about-era__stamp {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--wd-ink);
}

.page-about .about-era__dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--wd-steel);
  transform: rotate(45deg);
}

.page-about .about-era--current .about-era__dot {
  background: var(--wd-orange);
}

.page-about .about-era__title {
  margin: 0 0 10px;
  font-family: var(--wd-font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-era__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--wd-steel);
}

.page-about .about-era__points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  border-top: 1px solid var(--about-hair);
  padding-top: 12px;
}

.page-about .about-era__points li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--wd-steel);
}

.page-about .about-era__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--wd-cyan);
}

.page-about .about-era__flag {
  display: inline-block;
  margin: 14px 0 0;
  padding: 4px 10px;
  background: var(--wd-orange);
  color: var(--wd-black);
  font-family: var(--wd-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

/* ---------- 版本档案室 ---------- */
.page-about .about-vault {
  background: var(--wd-paper);
}

.page-about .about-vault__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-vault__figure {
  margin: 0;
  border: var(--wd-border);
  box-shadow: var(--wd-shadow);
  background: var(--wd-white);
}

.page-about .about-vault__figure .wd-media__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--wd-steel);
}

.page-about .about-vault__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--wd-steel);
}

.page-about .about-fields {
  margin: 20px 0 0;
  border-top: var(--wd-border);
}

.page-about .about-field {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-field dt {
  font-family: var(--wd-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--wd-ink);
  font-weight: 700;
}

.page-about .about-field dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--wd-steel);
}

.page-about .about-drawers {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.page-about .about-drawer {
  border: var(--wd-border);
  background: var(--wd-white);
  box-shadow: var(--wd-shadow-sm);
  padding: 16px 14px;
  transition: transform var(--wd-dur) var(--wd-ease), box-shadow var(--wd-dur) var(--wd-ease),
    border-color var(--wd-dur) var(--wd-ease);
}

.page-about .about-drawer:hover,
.page-about .about-drawer:focus-within {
  transform: translate(-2px, -3px);
  box-shadow: var(--wd-shadow-lg);
  border-color: var(--wd-orange);
}

.page-about .about-drawer__no {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--wd-cyan);
}

.page-about .about-drawer__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-drawer__meta {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--wd-steel);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  background: var(--wd-paper);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-team-grid {
  margin-bottom: 22px;
}

.page-about .about-team {
  border: var(--wd-border);
  background: var(--wd-white);
  box-shadow: var(--wd-shadow);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-team__no {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--wd-orange);
}

.page-about .about-team__title {
  margin: 0;
  font-family: var(--wd-font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--wd-steel);
}

.page-about .about-team__out {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-hair);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--wd-ink);
  font-weight: 500;
}

.page-about .about-teams__note {
  margin: 0;
  padding: 14px 16px;
  border-left: 6px solid var(--wd-cyan);
  background: #EAF1F6;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--wd-steel);
}

/* ---------- 质量流程 ---------- */
.page-about .about-quality {
  border-top: var(--wd-border);
  border-bottom: var(--wd-border);
}

.page-about .about-quality__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-quality__figure {
  margin: 0;
  border: var(--wd-border);
  box-shadow: var(--wd-shadow);
  background: var(--wd-white);
}

.page-about .about-quality__figure .wd-media__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--wd-steel);
}

.page-about .about-quality__steps {
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  border: var(--wd-border);
  background: var(--wd-white);
  box-shadow: var(--wd-shadow-sm);
}

.page-about .about-step[open] {
  box-shadow: var(--wd-shadow);
}

.page-about .about-step__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .about-step__no {
  font-size: 12px;
  font-weight: 700;
  color: var(--wd-orange);
}

.page-about .about-step__name {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-step__chev {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--wd-ink);
  border-bottom: 2px solid var(--wd-ink);
  transform: rotate(45deg);
  transition: transform var(--wd-dur) var(--wd-ease);
}

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

.page-about .about-step__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-step__body p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--wd-steel);
}

.page-about .about-rhythm {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border: var(--wd-border);
  background: var(--wd-white);
}

.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 14px 16px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-rhythm__item:last-child {
  border-bottom: none;
}

.page-about .about-rhythm__num {
  font-size: 16px;
  font-weight: 700;
  color: var(--wd-cyan);
}

.page-about .about-rhythm__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--wd-steel);
}

/* ---------- 服务地区与备案 ---------- */
.page-about .about-region {
  background: var(--wd-paper);
  padding-bottom: 26px;
}

.page-about .about-region__panel {
  display: grid;
  gap: 24px;
  padding: 26px 20px;
  background: var(--wd-ink);
  color: var(--wd-paper);
  border: var(--wd-border);
  box-shadow: var(--wd-shadow-lg);
}

.page-about .about-region__title {
  margin: 0 0 14px;
  font-family: var(--wd-font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .about-region__text {
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--wd-mist);
}

.page-about .about-region__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-region__info {
  margin: 0;
  border-top: 1px solid rgba(143, 163, 181, 0.4);
}

.page-about .about-region__row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(143, 163, 181, 0.28);
}

.page-about .about-region__row dt {
  font-family: var(--wd-font-mono);
  font-size: 12px;
  color: var(--wd-cyan);
}

.page-about .about-region__row dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--wd-paper);
  word-break: break-word;
}

.page-about .about-region__back {
  margin: 20px 0 0;
}

.page-about .about-region__back-link {
  display: inline-block;
  font-family: var(--wd-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--wd-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--wd-orange);
  padding-bottom: 3px;
}

.page-about .about-region__back-link:hover {
  color: var(--wd-orange);
}

.page-about .about-region__back-link:focus-visible {
  outline: 3px solid var(--wd-cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 48px 0 56px;
  }

  .page-about .about-hero__text {
    font-size: 16px;
  }

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

  .page-about .about-origin__item {
    padding: 52px 16px 18px;
  }

  .page-about .about-origin__mark {
    top: 16px;
  }

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

  .page-about .about-quality__figure {
    grid-column: 1 / -1;
  }

  .page-about .about-region__panel {
    grid-template-columns: 1.1fr 1fr;
    gap: 32px;
    padding: 32px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    flex-direction: column;
    align-items: stretch;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    text-align: center;
  }

  .page-about .about-vault__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-quality__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .about-quality__figure {
    grid-column: 1;
  }

  .page-about .about-quality__steps {
    grid-column: 2;
  }

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

  .page-about .about-rhythm__item:nth-child(odd) {
    border-right: 1px solid var(--about-hair);
  }

  .page-about .about-rhythm__item:nth-last-child(2) {
    border-bottom: none;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-era {
    padding: 24px 24px;
  }
}
<<<END>>>