.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

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

.page-about .button {
  text-decoration: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 0;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(200, 162, 74, 0.14), transparent 62%),
    var(--paper);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-hero .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-gold);
}

.page-about .about-hero .breadcrumbs__link {
  color: var(--ink-green-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-hero .breadcrumbs__link:hover,
.page-about .about-hero .breadcrumbs__link:focus-visible {
  color: var(--copper-deep);
  border-bottom-color: var(--crown-gold);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  padding: 26px 0 30px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 8vw, 84px);
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--ink-green);
}

.page-about .about-hero__mark {
  background-image: linear-gradient(90deg, var(--crown-gold), var(--copper));
  background-repeat: no-repeat;
  background-size: 100% 6px;
  background-position: 0 96%;
  padding-bottom: 6px;
}

.page-about .about-hero .lede {
  max-width: 34em;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

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

.page-about .about-hero__meta {
  align-self: start;
  padding: 18px 20px 20px;
  background: var(--paper-warm);
  border: 1px solid var(--line-gold);
  border-left: 3px solid var(--crown-gold);
}

.page-about .about-hero__meta-label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-hero__edition {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 42px;
  line-height: 1;
  color: var(--ink-green);
}

.page-about .about-hero__meta-note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 0;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-figure {
  padding: 16px 14px 18px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-figure:nth-child(odd) {
  border-right: 1px solid var(--line-gold);
}

.page-about .about-figure dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-figure dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.01em;
  color: var(--ink-green);
}

/* ---------- 档案主体 ---------- */
.page-about .about-body {
  padding: 44px 0 56px;
}

.page-about .about-record {
  display: grid;
  gap: 30px;
}

.page-about .about-rail {
  display: block;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .chapter-nav__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .chapter-nav__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--ink-green);
  text-decoration: none;
  background: var(--paper-warm);
  border: 1px solid var(--line-gold);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--copper-deep);
}

.page-about .chapter-nav__link:hover,
.page-about .chapter-nav__link:focus-visible {
  border-color: var(--crown-gold);
  background: #fff;
}

.page-about .about-rail__stamp {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-chapter:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .about-chapter__index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--crown-gold);
}

.page-about .about-chapter .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--ink-green);
}

.page-about .prose {
  max-width: 36em;
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-inline-link {
  color: var(--copper-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--ink-green);
  border-bottom-color: var(--crown-gold);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line-gold);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 16px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--crown-gold);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--copper-deep);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink-green);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
}

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  margin-top: 24px;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-principle__no {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--line-gold);
}

.page-about .about-principle__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-green);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
}

/* ---------- 四级阶梯与手风琴 ---------- */
.page-about .about-stairs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: end;
  gap: 8px;
  margin: 24px 0 4px;
}

.page-about .about-stair {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
  min-height: 70px;
  padding: 10px 6px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-green);
  background: var(--paper-warm);
  border: 1px solid var(--line-gold);
  border-bottom: 3px solid var(--crown-gold);
}

.page-about .about-stair span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--copper-deep);
}

.page-about .about-stair:nth-child(2) {
  min-height: 90px;
}

.page-about .about-stair:nth-child(3) {
  min-height: 110px;
}

.page-about .about-stair:nth-child(4) {
  min-height: 130px;
}

.page-about .about-figure-img {
  margin: 24px 0 0;
}

.page-about .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-gold);
  background: var(--paper-warm);
}

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

.page-about .media-frame__caption {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .accordion {
  margin-top: 22px;
  border-top: 1px solid var(--line-gold);
}

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

.page-about .accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 2px;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-green);
  transition: color var(--dur) var(--ease);
}

.page-about .accordion__trigger:hover,
.page-about .accordion__trigger:focus-visible {
  color: var(--copper-deep);
}

.page-about .accordion__trigger:focus-visible {
  outline: 2px solid var(--crown-gold);
  outline-offset: 2px;
}

.page-about .about-level {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-level__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--copper-deep);
  border: 1px solid var(--line-gold);
  padding: 2px 6px;
}

.page-about .accordion__icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.page-about .accordion__icon::before,
.page-about .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--crown-gold);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .accordion__icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-about .accordion__icon::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .accordion__panel {
  padding: 0 2px 18px;
}

.page-about .accordion__panel p {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-note {
  margin: 20px 0 0;
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-green-500);
  background: var(--paper-warm);
  border-left: 2px solid var(--crown-gold);
}

/* ---------- 质检 ---------- */
.page-about .about-quality {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 24px 20px;
  background: var(--ink-green);
  border-left: 3px solid var(--crown-gold);
  color: var(--paper);
}

.page-about .about-quality__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 54px;
  line-height: 1;
  color: var(--crown-gold);
}

.page-about .about-quality__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-quality p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(252, 250, 244, 0.84);
}

.page-about .about-checks {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-checks li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-gold);
  align-items: start;
}

.page-about .about-checks__no {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--copper);
}

.page-about .about-checks p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 服务网络 ---------- */
.page-about .about-regions {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-region {
  padding: 16px 16px 18px;
  background: var(--paper-warm);
  border: 1px solid var(--line-gold);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-region:hover,
.page-about .about-region:focus-visible,
.page-about .about-region:focus-within {
  border-color: var(--crown-gold);
  background: #fff;
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-region__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-green);
}

.page-about .about-region__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  background: var(--crown-gold);
  vertical-align: 2px;
}

.page-about .about-region__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 认证版本 ---------- */
.page-about .about-cert {
  display: grid;
  gap: 22px;
  margin-top: 20px;
}

.page-about .about-cert__list {
  margin: 0 0 20px;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-cert__list > div {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-cert__list dt {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-cert__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink-green);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .about-team__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-green);
}

.page-about .about-team__body p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-metrics li {
  padding: 14px 12px;
  background: var(--paper-warm);
  border-left: 2px solid var(--crown-gold);
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--ink-green);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 页尾行动区 ---------- */
.page-about .about-cta {
  padding: 40px 0 48px;
  background: var(--ink-green);
  color: var(--paper);
}

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

.page-about .about-cta .eyebrow {
  color: var(--crown-gold);
  margin-bottom: 10px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(252, 250, 244, 0.82);
}

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

.page-about .about-cta .button--ghost {
  color: var(--paper);
  border-color: var(--line-gold);
  background: transparent;
}

.page-about .about-cta .button--ghost:hover,
.page-about .about-cta .button--ghost:focus-visible {
  border-color: var(--crown-gold);
  color: var(--crown-gold);
}

.page-about .about-cta .button--quiet {
  color: var(--line-gold);
  background: transparent;
}

.page-about .about-cta .button--quiet:hover,
.page-about .about-cta .button--quiet:focus-visible {
  color: var(--paper);
}

/* ---------- 中等宽度 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figure:nth-child(odd) {
    border-right: 0;
  }

  .page-about .about-figure + .about-figure {
    border-left: 1px solid var(--line-gold);
  }

  .page-about .about-cert {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: start;
  }

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

  .page-about .about-quality {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: center;
    padding: 28px 26px;
  }

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

/* ---------- 桌面：左侧粘性目录 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 28px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 48px;
    padding: 34px 0 40px;
  }

  .page-about .about-hero__meta {
    margin-top: 8px;
  }

  .page-about .about-body {
    padding: 60px 0 76px;
  }

  .page-about .about-record {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .chapter-nav__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .chapter-nav__link {
    position: relative;
    padding: 11px 0 11px 16px;
    border: 0;
    border-left: 1px solid var(--line-gold);
    background: none;
    font-size: 13px;
  }

  .page-about .chapter-nav__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--crown-gold);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--dur) var(--ease);
  }

  .page-about .chapter-nav__link:hover,
  .page-about .chapter-nav__link:focus-visible {
    background: none;
    color: var(--copper-deep);
  }

  .page-about .chapter-nav__link:hover::before,
  .page-about .chapter-nav__link:focus-visible::before,
  .page-about .chapter-nav__link.is-active::before {
    transform: scaleY(1);
  }

  .page-about .chapter-nav__link.is-active {
    color: var(--ink-green);
  }

  .page-about .about-rail__stamp {
    display: block;
    margin-top: 26px;
    width: 96px;
    padding: 12px 8px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.12em;
    line-height: 1.7;
    color: var(--copper-deep);
    border: 1px solid var(--crown-gold);
    border-radius: 50%;
    background: var(--paper-warm);
  }

  .page-about .about-rail__stamp strong {
    display: block;
    font-size: 14px;
    letter-spacing: 0.04em;
    color: var(--ink-green);
  }

  .page-about .about-chapter {
    padding-bottom: 52px;
    margin-bottom: 52px;
  }

  .page-about .about-principle {
    grid-template-columns: 64px 1fr;
    gap: 20px;
    padding: 24px 0;
  }

  .page-about .about-principle__no {
    font-size: 40px;
  }

  .page-about .about-figure-img {
    margin-top: 28px;
  }

  .page-about .about-team {
    gap: 34px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
    max-width: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-region:hover,
  .page-about .about-region:focus-visible,
  .page-about .about-region:focus-within {
    transform: none;
  }
}
<<<END>>>